Charles Hardin <ckhardin@gmail.com> move jim into helper

git-svn-id: svn://svn.berlios.de/openocd/trunk@822 b42882b7-edfa-0310-969c-e2dbd0fdcd60

5 files changed, 13345 insertions, 2 deletions

diff --git a/src/helper/Makefile.am b/src/helper/Makefile.am
index 8a2d472..2ba0a56 100644
--- a/src/helper/Makefile.am
+++ b/src/helper/Makefile.am
@@ -6,10 +6,24 @@ noinst_LIBRARIES = libhelper.a
 if ECOSBOARD
 CONFIGFILES = 
 else
-CONFIGFILES = options.c
+CONFIGFILES = options.c jim.c
 endif
 
 libhelper_a_SOURCES = binarybuffer.c $(CONFIGFILES) configuration.c log.c command.c time_support.c \
 	replacements.c fileio.c
 noinst_HEADERS = binarybuffer.h configuration.h types.h log.h command.h \
-	time_support.h replacements.h fileio.h
+	time_support.h replacements.h fileio.h \
+	jim.h
+
+libhelper_a_SOURCES += startup_tcl.c
+
+noinst_PROGRAMS = bin2char
+
+bin2char_SOURCES = bin2char.c
+
+# Convert .tcl to cfile
+startup_tcl.c: bin2char startup.tcl
+	./bin2char startup_tcl < $(srcdir)/startup.tcl > startup_tcl.c
+
+# add startup_tcl.c to make clean list
+CLEANFILES = startup_tcl.c
diff --git a/src/helper/bin2char.c b/src/helper/bin2char.c
new file mode 100644
index 0000000..f1c809c
--- /dev/null
+++ b/src/helper/bin2char.c
@@ -0,0 +1,48 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by Dominic Rath                                    *
+ *   Dominic.Rath@gmx.de                                                   *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+	int c;
+	unsigned int n;
+	char *name;
+
+	if (argc == 1) {
+		fprintf(stderr, "bin2char <varname>\n");
+		fprintf(stderr, "read from standard input and write a char"
+		    " array out to standard output\n");
+		exit(1);
+	}
+
+	n = 0;
+	name = argv[1];
+	fprintf(stdout, "/* autogenerated from %s */\n", argv[0]);
+	fprintf(stdout, "unsigned const char %s[] = {\n", name);
+	while ((c = getc(stdin)) != EOF) {
+		fprintf(stdout, "0x%02x,", c & 0xff);
+		if ((++n % 16) == 0)
+			fprintf(stdout, "\n");
+	}
+	fprintf(stdout, "0 /* terminate with a null */};\n");
+	return 0;
+}
diff --git a/src/helper/jim.c b/src/helper/jim.c
new file mode 100644
index 0000000..c1434db
--- /dev/null
+++ b/src/helper/jim.c
@@ -0,0 +1,12134 @@
+/* Jim - A small embeddable Tcl interpreter
+ * Copyright 2005 Salvatore Sanfilippo <antirez@invece.org>
+ * Copyright 2005 Clemens Hintze <c.hintze@gmx.net>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * A copy of the license is also included in the source distribution
+ * of Jim, as a TXT file name called LICENSE.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define __JIM_CORE__
+#define JIM_OPTIMIZATION /* comment to avoid optimizations and reduce size */
+
+#ifdef __ECOS
+#include <pkgconf/jimtcl.h>
+#endif
+#ifndef JIM_ANSIC
+#define JIM_DYNLIB      /* Dynamic library support for UNIX and WIN32 */
+#endif /* JIM_ANSIC */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <limits.h>
+#include <assert.h>
+#include <errno.h>
+#include <time.h>
+
+#include "replacements.h"
+
+/* Include the platform dependent libraries for
+ * dynamic loading of libraries. */
+#ifdef JIM_DYNLIB
+#if defined(_WIN32) || defined(WIN32)
+#ifndef WIN32
+#define WIN32 1
+#endif
+#ifndef STRICT
+#define STRICT
+#endif
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#if _MSC_VER >= 1000
+#pragma warning(disable:4146)
+#endif /* _MSC_VER */
+#else
+#include <dlfcn.h>
+#endif /* WIN32 */
+#endif /* JIM_DYNLIB */
+
+#ifdef __ECOS
+#include <cyg/jimtcl/jim.h>
+#else
+#include "jim.h"
+#endif
+
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+#endif
+
+/* -----------------------------------------------------------------------------
+ * Global variables
+ * ---------------------------------------------------------------------------*/
+
+/* A shared empty string for the objects string representation.
+ * Jim_InvalidateStringRep knows about it and don't try to free. */
+static char *JimEmptyStringRep = (char*) "";
+
+/* -----------------------------------------------------------------------------
+ * Required prototypes of not exported functions
+ * ---------------------------------------------------------------------------*/
+static void JimChangeCallFrameId(Jim_Interp *interp, Jim_CallFrame *cf);
+static void JimFreeCallFrame(Jim_Interp *interp, Jim_CallFrame *cf, int flags);
+static void JimRegisterCoreApi(Jim_Interp *interp);
+
+static Jim_HashTableType JimVariablesHashTableType;
+
+/* -----------------------------------------------------------------------------
+ * Utility functions
+ * ---------------------------------------------------------------------------*/
+
+/*
+ * Convert a string to a jim_wide INTEGER.
+ * This function originates from BSD.
+ *
+ * Ignores `locale' stuff.  Assumes that the upper and lower case
+ * alphabets and digits are each contiguous.
+ */
+#ifdef HAVE_LONG_LONG
+#define JimIsAscii(c) (((c) & ~0x7f) == 0)
+static jim_wide JimStrtoll(const char *nptr, char **endptr, register int base)
+{
+    register const char *s;
+    register unsigned jim_wide acc;
+    register unsigned char c;
+    register unsigned jim_wide qbase, cutoff;
+    register int neg, any, cutlim;
+
+    /*
+     * Skip white space and pick up leading +/- sign if any.
+     * If base is 0, allow 0x for hex and 0 for octal, else
+     * assume decimal; if base is already 16, allow 0x.
+     */
+    s = nptr;
+    do {
+        c = *s++;
+    } while (isspace(c));
+    if (c == '-') {
+        neg = 1;
+        c = *s++;
+    } else {
+        neg = 0;
+        if (c == '+')
+            c = *s++;
+    }
+    if ((base == 0 || base == 16) &&
+        c == '0' && (*s == 'x' || *s == 'X')) {
+        c = s[1];
+        s += 2;
+        base = 16;
+    }
+    if (base == 0)
+        base = c == '0' ? 8 : 10;
+
+    /*
+     * Compute the cutoff value between legal numbers and illegal
+     * numbers.  That is the largest legal value, divided by the
+     * base.  An input number that is greater than this value, if
+     * followed by a legal input character, is too big.  One that
+     * is equal to this value may be valid or not; the limit
+     * between valid and invalid numbers is then based on the last
+     * digit.  For instance, if the range for quads is
+     * [-9223372036854775808..9223372036854775807] and the input base
+     * is 10, cutoff will be set to 922337203685477580 and cutlim to
+     * either 7 (neg==0) or 8 (neg==1), meaning that if we have
+     * accumulated a value > 922337203685477580, or equal but the
+     * next digit is > 7 (or 8), the number is too big, and we will
+     * return a range error.
+     *
+     * Set any if any `digits' consumed; make it negative to indicate
+     * overflow.
+     */
+    qbase = (unsigned)base;
+    cutoff = neg ? (unsigned jim_wide)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
+        : LLONG_MAX;
+    cutlim = (int)(cutoff % qbase);
+    cutoff /= qbase;
+    for (acc = 0, any = 0;; c = *s++) {
+        if (!JimIsAscii(c))
+            break;
+        if (isdigit(c))
+            c -= '0';
+        else if (isalpha(c))
+            c -= isupper(c) ? 'A' - 10 : 'a' - 10;
+        else
+            break;
+        if (c >= base)
+            break;
+        if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
+            any = -1;
+        else {
+            any = 1;
+            acc *= qbase;
+            acc += c;
+        }
+    }
+    if (any < 0) {
+        acc = neg ? LLONG_MIN : LLONG_MAX;
+        errno = ERANGE;
+    } else if (neg)
+        acc = -acc;
+    if (endptr != 0)
+        *endptr = (char *)(any ? s - 1 : nptr);
+    return (acc);
+}
+#endif
+
+/* Glob-style pattern matching. */
+static int JimStringMatch(const char *pattern, int patternLen,
+        const char *string, int stringLen, int nocase)
+{
+    while(patternLen) {
+        switch(pattern[0]) {
+        case '*':
+            while (pattern[1] == '*') {
+                pattern++;
+                patternLen--;
+            }
+            if (patternLen == 1)
+                return 1; /* match */
+            while(stringLen) {
+                if (JimStringMatch(pattern+1, patternLen-1,
+                            string, stringLen, nocase))
+                    return 1; /* match */
+                string++;
+                stringLen--;
+            }
+            return 0; /* no match */
+            break;
+        case '?':
+            if (stringLen == 0)
+                return 0; /* no match */
+            string++;
+            stringLen--;
+            break;
+        case '[':
+        {
+            int not, match;
+
+            pattern++;
+            patternLen--;
+            not = pattern[0] == '^';
+            if (not) {
+                pattern++;
+                patternLen--;
+            }
+            match = 0;
+            while(1) {
+                if (pattern[0] == '\\') {
+                    pattern++;
+                    patternLen--;
+                    if (pattern[0] == string[0])
+                        match = 1;
+                } else if (pattern[0] == ']') {
+                    break;
+                } else if (patternLen == 0) {
+                    pattern--;
+                    patternLen++;
+                    break;
+                } else if (pattern[1] == '-' && patternLen >= 3) {
+                    int start = pattern[0];
+                    int end = pattern[2];
+                    int c = string[0];
+                    if (start > end) {
+                        int t = start;
+                        start = end;
+                        end = t;
+                    }
+                    if (nocase) {
+                        start = tolower(start);
+                        end = tolower(end);
+                        c = tolower(c);
+                    }
+                    pattern += 2;
+                    patternLen -= 2;
+                    if (c >= start && c <= end)
+                        match = 1;
+                } else {
+                    if (!nocase) {
+                        if (pattern[0] == string[0])
+                            match = 1;
+                    } else {
+                        if (tolower((int)pattern[0]) == tolower((int)string[0]))
+                            match = 1;
+                    }
+                }
+                pattern++;
+                patternLen--;
+            }
+            if (not)
+                match = !match;
+            if (!match)
+                return 0; /* no match */
+            string++;
+            stringLen--;
+            break;
+        }
+        case '\\':
+            if (patternLen >= 2) {
+                pattern++;
+                patternLen--;
+            }
+            /* fall through */
+        default:
+            if (!nocase) {
+                if (pattern[0] != string[0])
+                    return 0; /* no match */
+            } else {
+                if (tolower((int)pattern[0]) != tolower((int)string[0]))
+                    return 0; /* no match */
+            }
+            string++;
+            stringLen--;
+            break;
+        }
+        pattern++;
+        patternLen--;
+        if (stringLen == 0) {
+            while(*pattern == '*') {
+                pattern++;
+                patternLen--;
+            }
+            break;
+        }
+    }
+    if (patternLen == 0 && stringLen == 0)
+        return 1;
+    return 0;
+}
+
+int JimStringCompare(const char *s1, int l1, const char *s2, int l2,
+        int nocase)
+{
+    unsigned char *u1 = (unsigned char*) s1, *u2 = (unsigned char*) s2;
+
+    if (nocase == 0) {
+        while(l1 && l2) {
+            if (*u1 != *u2)
+                return (int)*u1-*u2;
+            u1++; u2++; l1--; l2--;
+        }
+        if (!l1 && !l2) return 0;
+        return l1-l2;
+    } else {
+        while(l1 && l2) {
+            if (tolower((int)*u1) != tolower((int)*u2))
+                return tolower((int)*u1)-tolower((int)*u2);
+            u1++; u2++; l1--; l2--;
+        }
+        if (!l1 && !l2) return 0;
+        return l1-l2;
+    }
+}
+
+/* Search 's1' inside 's2', starting to search from char 'index' of 's2'.
+ * The index of the first occurrence of s1 in s2 is returned. 
+ * If s1 is not found inside s2, -1 is returned. */
+int JimStringFirst(const char *s1, int l1, const char *s2, int l2, int index)
+{
+    int i;
+
+    if (!l1 || !l2 || l1 > l2) return -1;
+    if (index < 0) index = 0;
+    s2 += index;
+    for (i = index; i <= l2-l1; i++) {
+        if (memcmp(s2, s1, l1) == 0)
+            return i;
+        s2++;
+    }
+    return -1;
+}
+
+int Jim_WideToString(char *buf, jim_wide wideValue)
+{
+    const char *fmt = "%" JIM_WIDE_MODIFIER;
+    return sprintf(buf, fmt, wideValue);
+}
+
+int Jim_StringToWide(const char *str, jim_wide *widePtr, int base)
+{
+    char *endptr;
+
+#ifdef HAVE_LONG_LONG
+    *widePtr = JimStrtoll(str, &endptr, base);
+#else
+    *widePtr = strtol(str, &endptr, base);
+#endif
+    if ((str[0] == '\0') || (str == endptr) )
+        return JIM_ERR;
+    if (endptr[0] != '\0') {
+        while(*endptr) {
+            if (!isspace((int)*endptr))
+                return JIM_ERR;
+            endptr++;
+        }
+    }
+    return JIM_OK;
+}
+
+int Jim_StringToIndex(const char *str, int *intPtr)
+{
+    char *endptr;
+
+    *intPtr = strtol(str, &endptr, 10);
+    if ( (str[0] == '\0') || (str == endptr) )
+        return JIM_ERR;
+    if (endptr[0] != '\0') {
+        while(*endptr) {
+            if (!isspace((int)*endptr))
+                return JIM_ERR;
+            endptr++;
+        }
+    }
+    return JIM_OK;
+}
+
+/* The string representation of references has two features in order
+ * to make the GC faster. The first is that every reference starts
+ * with a non common character '~', in order to make the string matching
+ * fater. The second is that the reference string rep his 32 characters
+ * in length, this allows to avoid to check every object with a string
+ * repr < 32, and usually there are many of this objects. */
+
+#define JIM_REFERENCE_SPACE (35+JIM_REFERENCE_TAGLEN)
+
+static int JimFormatReference(char *buf, Jim_Reference *refPtr, jim_wide id)
+{
+    const char *fmt = "<reference.<%s>.%020" JIM_WIDE_MODIFIER ">";
+    sprintf(buf, fmt, refPtr->tag, id);
+    return JIM_REFERENCE_SPACE;
+}
+
+int Jim_DoubleToString(char *buf, double doubleValue)
+{
+    char *s;
+    int len;
+
+    len = sprintf(buf, "%.17g", doubleValue);
+    s = buf;
+    while(*s) {
+        if (*s == '.') return len;
+        s++;
+    }
+    /* Add a final ".0" if it's a number. But not
+     * for NaN or InF */
+    if (isdigit((int)buf[0])
+        || ((buf[0] == '-' || buf[0] == '+')
+            && isdigit((int)buf[1]))) {
+        s[0] = '.';
+        s[1] = '0';
+        s[2] = '\0';
+        return len+2;
+    }
+    return len;
+}
+
+int Jim_StringToDouble(const char *str, double *doublePtr)
+{
+    char *endptr;
+
+    *doublePtr = strtod(str, &endptr);
+    if (str[0] == '\0' || endptr[0] != '\0' || (str == endptr) )
+        return JIM_ERR;
+    return JIM_OK;
+}
+
+static jim_wide JimPowWide(jim_wide b, jim_wide e)
+{
+    jim_wide i, res = 1;
+    if ((b==0 && e!=0) || (e<0)) return 0;
+    for(i=0; i<e; i++) {res *= b;}
+    return res;
+}
+
+/* -----------------------------------------------------------------------------
+ * Special functions
+ * ---------------------------------------------------------------------------*/
+
+/* Note that 'interp' may be NULL if not available in the
+ * context of the panic. It's only useful to get the error
+ * file descriptor, it will default to stderr otherwise. */
+void Jim_Panic(Jim_Interp *interp, const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+	/* 
+	 * Send it here first.. Assuming STDIO still works
+	 */
+    fprintf(stderr, JIM_NL "JIM INTERPRETER PANIC: ");
+    vfprintf(stderr, fmt, ap);
+    fprintf(stderr, JIM_NL JIM_NL);
+    va_end(ap);
+
+#ifdef HAVE_BACKTRACE
+    {
+        void *array[40];
+        int size, i;
+        char **strings;
+
+        size = backtrace(array, 40);
+        strings = backtrace_symbols(array, size);
+        for (i = 0; i < size; i++)
+            fprintf(fp,"[backtrace] %s" JIM_NL, strings[i]);
+        fprintf(fp,"[backtrace] Include the above lines and the output" JIM_NL);
+        fprintf(fp,"[backtrace] of 'nm <executable>' in the bug report." JIM_NL);
+    }
+#endif
+	
+	/* This may actually crash... we do it last */
+	if( interp && interp->cookie_stderr ){
+		Jim_fprintf(  interp, interp->cookie_stderr, JIM_NL "JIM INTERPRETER PANIC: ");
+		Jim_vfprintf( interp, interp->cookie_stderr, fmt, ap );
+		Jim_fprintf(  interp, interp->cookie_stderr, JIM_NL JIM_NL );
+	}
+    abort();
+}
+
+/* -----------------------------------------------------------------------------
+ * Memory allocation
+ * ---------------------------------------------------------------------------*/
+
+/* Macro used for memory debugging.
+ * In order for they to work you have to rename Jim_Alloc into _Jim_Alloc
+ * and similary for Jim_Realloc and Jim_Free */
+#if 0
+#define Jim_Alloc(s) (printf("%s %d: Jim_Alloc(%d)\n",__FILE__,__LINE__,s),_Jim_Alloc(s))
+#define Jim_Free(p) (printf("%s %d: Jim_Free(%p)\n",__FILE__,__LINE__,p),_Jim_Free(p))
+#define Jim_Realloc(p,s) (printf("%s %d: Jim_Realloc(%p,%d)\n",__FILE__,__LINE__,p,s),_Jim_Realloc(p,s))
+#endif
+
+void *Jim_Alloc(int size)
+{
+	/* We allocate zero length arrayes, etc. to use a single orthogonal codepath */
+	if (size==0)
+		size=1;
+    void *p = malloc(size);
+    if (p == NULL)
+        Jim_Panic(NULL,"malloc: Out of memory");
+    return p;
+}
+
+void Jim_Free(void *ptr) {
+    free(ptr);
+}
+
+void *Jim_Realloc(void *ptr, int size)
+{
+	/* We allocate zero length arrayes, etc. to use a single orthogonal codepath */
+	if (size==0)
+		size=1;
+    void *p = realloc(ptr, size);
+    if (p == NULL)
+        Jim_Panic(NULL,"realloc: Out of memory");
+    return p;
+}
+
+char *Jim_StrDup(const char *s)
+{
+    int l = strlen(s);
+    char *copy = Jim_Alloc(l+1);
+
+    memcpy(copy, s, l+1);
+    return copy;
+}
+
+char *Jim_StrDupLen(const char *s, int l)
+{
+    char *copy = Jim_Alloc(l+1);
+    
+    memcpy(copy, s, l+1);
+    copy[l] = 0;    /* Just to be sure, original could be substring */
+    return copy;
+}
+
+/* -----------------------------------------------------------------------------
+ * Time related functions
+ * ---------------------------------------------------------------------------*/
+/* Returns microseconds of CPU used since start. */
+static jim_wide JimClock(void)
+{
+#if (defined WIN32) && !(defined JIM_ANSIC)
+    LARGE_INTEGER t, f;
+    QueryPerformanceFrequency(&f);
+    QueryPerformanceCounter(&t);
+    return (long)((t.QuadPart * 1000000) / f.QuadPart);
+#else /* !WIN32 */
+    clock_t clocks = clock();
+
+    return (long)(clocks*(1000000/CLOCKS_PER_SEC));
+#endif /* WIN32 */
+}
+
+/* -----------------------------------------------------------------------------
+ * Hash Tables
+ * ---------------------------------------------------------------------------*/
+
+/* -------------------------- private prototypes ---------------------------- */
+static int JimExpandHashTableIfNeeded(Jim_HashTable *ht);
+static unsigned int JimHashTableNextPower(unsigned int size);
+static int JimInsertHashEntry(Jim_HashTable *ht, const void *key);
+
+/* -------------------------- hash functions -------------------------------- */
+
+/* Thomas Wang's 32 bit Mix Function */
+unsigned int Jim_IntHashFunction(unsigned int key)
+{
+    key += ~(key << 15);
+    key ^=  (key >> 10);
+    key +=  (key << 3);
+    key ^=  (key >> 6);
+    key += ~(key << 11);
+    key ^=  (key >> 16);
+    return key;
+}
+
+/* Identity hash function for integer keys */
+unsigned int Jim_IdentityHashFunction(unsigned int key)
+{
+    return key;
+}
+
+/* Generic hash function (we are using to multiply by 9 and add the byte
+ * as Tcl) */
+unsigned int Jim_GenHashFunction(const unsigned char *buf, int len)
+{
+    unsigned int h = 0;
+    while(len--)
+        h += (h<<3)+*buf++;
+    return h;
+}
+
+/* ----------------------------- API implementation ------------------------- */
+/* reset an hashtable already initialized with ht_init().
+ * NOTE: This function should only called by ht_destroy(). */
+static void JimResetHashTable(Jim_HashTable *ht)
+{
+    ht->table = NULL;
+    ht->size = 0;
+    ht->sizemask = 0;
+    ht->used = 0;
+    ht->collisions = 0;
+}
+
+/* Initialize the hash table */
+int Jim_InitHashTable(Jim_HashTable *ht, Jim_HashTableType *type,
+        void *privDataPtr)
+{
+    JimResetHashTable(ht);
+    ht->type = type;
+    ht->privdata = privDataPtr;
+    return JIM_OK;
+}
+
+/* Resize the table to the minimal size that contains all the elements,
+ * but with the invariant of a USER/BUCKETS ration near to <= 1 */
+int Jim_ResizeHashTable(Jim_HashTable *ht)
+{
+    int minimal = ht->used;
+
+    if (minimal < JIM_HT_INITIAL_SIZE)
+        minimal = JIM_HT_INITIAL_SIZE;
+    return Jim_ExpandHashTable(ht, minimal);
+}
+
+/* Expand or create the hashtable */
+int Jim_ExpandHashTable(Jim_HashTable *ht, unsigned int size)
+{
+    Jim_HashTable n; /* the new hashtable */
+    unsigned int realsize = JimHashTableNextPower(size), i;
+
+    /* the size is invalid if it is smaller than the number of
+     * elements already inside the hashtable */
+    if (ht->used >= size)
+        return JIM_ERR;
+
+    Jim_InitHashTable(&n, ht->type, ht->privdata);
+    n.size = realsize;
+    n.sizemask = realsize-1;
+    n.table = Jim_Alloc(realsize*sizeof(Jim_HashEntry*));
+
+    /* Initialize all the pointers to NULL */
+    memset(n.table, 0, realsize*sizeof(Jim_HashEntry*));
+
+    /* Copy all the elements from the old to the new table:
+     * note that if the old hash table is empty ht->size is zero,
+     * so Jim_ExpandHashTable just creates an hash table. */
+    n.used = ht->used;
+    for (i = 0; i < ht->size && ht->used > 0; i++) {
+        Jim_HashEntry *he, *nextHe;
+
+        if (ht->table[i] == NULL) continue;
+        
+        /* For each hash entry on this slot... */
+        he = ht->table[i];
+        while(he) {
+            unsigned int h;
+
+            nextHe = he->next;
+            /* Get the new element index */
+            h = Jim_HashKey(ht, he->key) & n.sizemask;
+            he->next = n.table[h];
+            n.table[h] = he;
+            ht->used--;
+            /* Pass to the next element */
+            he = nextHe;
+        }
+    }
+    assert(ht->used == 0);
+    Jim_Free(ht->table);
+
+    /* Remap the new hashtable in the old */
+    *ht = n;
+    return JIM_OK;
+}
+
+/* Add an element to the target hash table */
+int Jim_AddHashEntry(Jim_HashTable *ht, const void *key, void *val)
+{
+    int index;
+    Jim_HashEntry *entry;
+
+    /* Get the index of the new element, or -1 if
+     * the element already exists. */
+    if ((index = JimInsertHashEntry(ht, key)) == -1)
+        return JIM_ERR;
+
+    /* Allocates the memory and stores key */
+    entry = Jim_Alloc(sizeof(*entry));
+    entry->next = ht->table[index];
+    ht->table[index] = entry;
+
+    /* Set the hash entry fields. */
+    Jim_SetHashKey(ht, entry, key);
+    Jim_SetHashVal(ht, entry, val);
+    ht->used++;
+    return JIM_OK;
+}
+
+/* Add an element, discarding the old if the key already exists */
+int Jim_ReplaceHashEntry(Jim_HashTable *ht, const void *key, void *val)
+{
+    Jim_HashEntry *entry;
+
+    /* Try to add the element. If the key
+     * does not exists Jim_AddHashEntry will suceed. */
+    if (Jim_AddHashEntry(ht, key, val) == JIM_OK)
+        return JIM_OK;
+    /* It already exists, get the entry */
+    entry = Jim_FindHashEntry(ht, key);
+    /* Free the old value and set the new one */
+    Jim_FreeEntryVal(ht, entry);
+    Jim_SetHashVal(ht, entry, val);
+    return JIM_OK;
+}
+
+/* Search and remove an element */
+int Jim_DeleteHashEntry(Jim_HashTable *ht, const void *key)
+{
+    unsigned int h;
+    Jim_HashEntry *he, *prevHe;
+
+    if (ht->size == 0)
+        return JIM_ERR;
+    h = Jim_HashKey(ht, key) & ht->sizemask;
+    he = ht->table[h];
+
+    prevHe = NULL;
+    while(he) {
+        if (Jim_CompareHashKeys(ht, key, he->key)) {
+            /* Unlink the element from the list */
+            if (prevHe)
+                prevHe->next = he->next;
+            else
+                ht->table[h] = he->next;
+            Jim_FreeEntryKey(ht, he);
+            Jim_FreeEntryVal(ht, he);
+            Jim_Free(he);
+            ht->used--;
+            return JIM_OK;
+        }
+        prevHe = he;
+        he = he->next;
+    }
+    return JIM_ERR; /* not found */
+}
+
+/* Destroy an entire hash table */
+int Jim_FreeHashTable(Jim_HashTable *ht)
+{
+    unsigned int i;
+
+    /* Free all the elements */
+    for (i = 0; i < ht->size && ht->used > 0; i++) {
+        Jim_HashEntry *he, *nextHe;
+
+        if ((he = ht->table[i]) == NULL) continue;
+        while(he) {
+            nextHe = he->next;
+            Jim_FreeEntryKey(ht, he);
+            Jim_FreeEntryVal(ht, he);
+            Jim_Free(he);
+            ht->used--;
+            he = nextHe;
+        }
+    }
+    /* Free the table and the allocated cache structure */
+    Jim_Free(ht->table);
+    /* Re-initialize the table */
+    JimResetHashTable(ht);
+    return JIM_OK; /* never fails */
+}
+
+Jim_HashEntry *Jim_FindHashEntry(Jim_HashTable *ht, const void *key)
+{
+    Jim_HashEntry *he;
+    unsigned int h;
+
+    if (ht->size == 0) return NULL;
+    h = Jim_HashKey(ht, key) & ht->sizemask;
+    he = ht->table[h];
+    while(he) {
+        if (Jim_CompareHashKeys(ht, key, he->key))
+            return he;
+        he = he->next;
+    }
+    return NULL;
+}
+
+Jim_HashTableIterator *Jim_GetHashTableIterator(Jim_HashTable *ht)
+{
+    Jim_HashTableIterator *iter = Jim_Alloc(sizeof(*iter));
+
+    iter->ht = ht;
+    iter->index = -1;
+    iter->entry = NULL;
+    iter->nextEntry = NULL;
+    return iter;
+}
+
+Jim_HashEntry *Jim_NextHashEntry(Jim_HashTableIterator *iter)
+{
+    while (1) {
+        if (iter->entry == NULL) {
+            iter->index++;
+            if (iter->index >=
+                    (signed)iter->ht->size) break;
+            iter->entry = iter->ht->table[iter->index];
+        } else {
+            iter->entry = iter->nextEntry;
+        }
+        if (iter->entry) {
+            /* We need to save the 'next' here, the iterator user
+             * may delete the entry we are returning. */
+            iter->nextEntry = iter->entry->next;
+            return iter->entry;
+        }
+    }
+    return NULL;
+}
+
+/* ------------------------- private functions ------------------------------ */
+
+/* Expand the hash table if needed */
+static int JimExpandHashTableIfNeeded(Jim_HashTable *ht)
+{
+    /* If the hash table is empty expand it to the intial size,
+     * if the table is "full" dobule its size. */
+    if (ht->size == 0)
+        return Jim_ExpandHashTable(ht, JIM_HT_INITIAL_SIZE);
+    if (ht->size == ht->used)
+        return Jim_ExpandHashTable(ht, ht->size*2);
+    return JIM_OK;
+}
+
+/* Our hash table capability is a power of two */
+static unsigned int JimHashTableNextPower(unsigned int size)
+{
+    unsigned int i = JIM_HT_INITIAL_SIZE;
+
+    if (size >= 2147483648U)
+        return 2147483648U;
+    while(1) {
+        if (i >= size)
+            return i;
+        i *= 2;
+    }
+}
+
+/* Returns the index of a free slot that can be populated with
+ * an hash entry for the given 'key'.
+ * If the key already exists, -1 is returned. */
+static int JimInsertHashEntry(Jim_HashTable *ht, const void *key)
+{
+    unsigned int h;
+    Jim_HashEntry *he;
+
+    /* Expand the hashtable if needed */
+    if (JimExpandHashTableIfNeeded(ht) == JIM_ERR)
+        return -1;
+    /* Compute the key hash value */
+    h = Jim_HashKey(ht, key) & ht->sizemask;
+    /* Search if this slot does not already contain the given key */
+    he = ht->table[h];
+    while(he) {
+        if (Jim_CompareHashKeys(ht, key, he->key))
+            return -1;
+        he = he->next;
+    }
+    return h;
+}
+
+/* ----------------------- StringCopy Hash Table Type ------------------------*/
+
+static unsigned int JimStringCopyHTHashFunction(const void *key)
+{
+    return Jim_GenHashFunction(key, strlen(key));
+}
+
+static const void *JimStringCopyHTKeyDup(void *privdata, const void *key)
+{
+    int len = strlen(key);
+    char *copy = Jim_Alloc(len+1);
+    JIM_NOTUSED(privdata);
+
+    memcpy(copy, key, len);
+    copy[len] = '\0';
+    return copy;
+}
+
+static void *JimStringKeyValCopyHTValDup(void *privdata, const void *val)
+{
+    int len = strlen(val);
+    char *copy = Jim_Alloc(len+1);
+    JIM_NOTUSED(privdata);
+
+    memcpy(copy, val, len);
+    copy[len] = '\0';
+    return copy;
+}
+
+static int JimStringCopyHTKeyCompare(void *privdata, const void *key1,
+        const void *key2)
+{
+    JIM_NOTUSED(privdata);
+
+    return strcmp(key1, key2) == 0;
+}
+
+static void JimStringCopyHTKeyDestructor(void *privdata, const void *key)
+{
+    JIM_NOTUSED(privdata);
+
+    Jim_Free((void*)key); /* ATTENTION: const cast */
+}
+
+static void JimStringKeyValCopyHTValDestructor(void *privdata, void *val)
+{
+    JIM_NOTUSED(privdata);
+
+    Jim_Free((void*)val); /* ATTENTION: const cast */
+}
+
+static Jim_HashTableType JimStringCopyHashTableType = {
+    JimStringCopyHTHashFunction,        /* hash function */
+    JimStringCopyHTKeyDup,              /* key dup */
+    NULL,                               /* val dup */
+    JimStringCopyHTKeyCompare,          /* key compare */
+    JimStringCopyHTKeyDestructor,       /* key destructor */
+    NULL                                /* val destructor */
+};
+
+/* This is like StringCopy but does not auto-duplicate the key.
+ * It's used for intepreter's shared strings. */
+static Jim_HashTableType JimSharedStringsHashTableType = {
+    JimStringCopyHTHashFunction,        /* hash function */
+    NULL,                               /* key dup */
+    NULL,                               /* val dup */
+    JimStringCopyHTKeyCompare,          /* key compare */
+    JimStringCopyHTKeyDestructor,       /* key destructor */
+    NULL                                /* val destructor */
+};
+
+/* This is like StringCopy but also automatically handle dynamic
+ * allocated C strings as values. */
+static Jim_HashTableType JimStringKeyValCopyHashTableType = {
+    JimStringCopyHTHashFunction,        /* hash function */
+    JimStringCopyHTKeyDup,              /* key dup */
+    JimStringKeyValCopyHTValDup,        /* val dup */
+    JimStringCopyHTKeyCompare,          /* key compare */
+    JimStringCopyHTKeyDestructor,       /* key destructor */
+    JimStringKeyValCopyHTValDestructor, /* val destructor */
+};
+
+typedef struct AssocDataValue {
+    Jim_InterpDeleteProc *delProc;
+    void *data;
+} AssocDataValue;
+
+static void JimAssocDataHashTableValueDestructor(void *privdata, void *data)
+{
+    AssocDataValue *assocPtr = (AssocDataValue *)data;
+    if (assocPtr->delProc != NULL)
+        assocPtr->delProc((Jim_Interp *)privdata, assocPtr->data);
+    Jim_Free(data);
+}
+
+static Jim_HashTableType JimAssocDataHashTableType = {
+    JimStringCopyHTHashFunction,         /* hash function */
+    JimStringCopyHTKeyDup,               /* key dup */
+    NULL,                                /* val dup */
+    JimStringCopyHTKeyCompare,           /* key compare */
+    JimStringCopyHTKeyDestructor,        /* key destructor */
+    JimAssocDataHashTableValueDestructor /* val destructor */
+};
+
+/* -----------------------------------------------------------------------------
+ * Stack - This is a simple generic stack implementation. It is used for
+ * example in the 'expr' expression compiler.
+ * ---------------------------------------------------------------------------*/
+void Jim_InitStack(Jim_Stack *stack)
+{
+    stack->len = 0;
+    stack->maxlen = 0;
+    stack->vector = NULL;
+}
+
+void Jim_FreeStack(Jim_Stack *stack)
+{
+    Jim_Free(stack->vector);
+}
+
+int Jim_StackLen(Jim_Stack *stack)
+{
+    return stack->len;
+}
+
+void Jim_StackPush(Jim_Stack *stack, void *element) {
+    int neededLen = stack->len+1;
+    if (neededLen > stack->maxlen) {
+        stack->maxlen = neededLen*2;
+        stack->vector = Jim_Realloc(stack->vector, sizeof(void*)*stack->maxlen);
+    }
+    stack->vector[stack->len] = element;
+    stack->len++;
+}
+
+void *Jim_StackPop(Jim_Stack *stack)
+{
+    if (stack->len == 0) return NULL;
+    stack->len--;
+    return stack->vector[stack->len];
+}
+
+void *Jim_StackPeek(Jim_Stack *stack)
+{
+    if (stack->len == 0) return NULL;
+    return stack->vector[stack->len-1];
+}
+
+void Jim_FreeStackElements(Jim_Stack *stack, void (*freeFunc)(void *ptr))
+{
+    int i;
+
+    for (i = 0; i < stack->len; i++)
+        freeFunc(stack->vector[i]);
+}
+
+/* -----------------------------------------------------------------------------
+ * Parser
+ * ---------------------------------------------------------------------------*/
+
+/* Token types */
+#define JIM_TT_NONE -1        /* No token returned */
+#define JIM_TT_STR 0        /* simple string */
+#define JIM_TT_ESC 1        /* string that needs escape chars conversion */
+#define JIM_TT_VAR 2        /* var substitution */
+#define JIM_TT_DICTSUGAR 3    /* Syntax sugar for [dict get], $foo(bar) */
+#define JIM_TT_CMD 4        /* command substitution */
+#define JIM_TT_SEP 5        /* word separator */
+#define JIM_TT_EOL 6        /* line separator */
+
+/* Additional token types needed for expressions */
+#define JIM_TT_SUBEXPR_START 7
+#define JIM_TT_SUBEXPR_END 8
+#define JIM_TT_EXPR_NUMBER 9
+#define JIM_TT_EXPR_OPERATOR 10
+
+/* Parser states */
+#define JIM_PS_DEF 0        /* Default state */
+#define JIM_PS_QUOTE 1        /* Inside "" */
+
+/* Parser context structure. The same context is used both to parse
+ * Tcl scripts and lists. */
+struct JimParserCtx {
+    const char *prg;     /* Program text */
+    const char *p;       /* Pointer to the point of the program we are parsing */
+    int len;             /* Left length of 'prg' */
+    int linenr;          /* Current line number */
+    const char *tstart;
+    const char *tend;    /* Returned token is at tstart-tend in 'prg'. */
+    int tline;           /* Line number of the returned token */
+    int tt;              /* Token type */
+    int eof;             /* Non zero if EOF condition is true. */
+    int state;           /* Parser state */
+    int comment;         /* Non zero if the next chars may be a comment. */
+};
+
+#define JimParserEof(c) ((c)->eof)
+#define JimParserTstart(c) ((c)->tstart)
+#define JimParserTend(c) ((c)->tend)
+#define JimParserTtype(c) ((c)->tt)
+#define JimParserTline(c) ((c)->tline)
+
+static int JimParseScript(struct JimParserCtx *pc);
+static int JimParseSep(struct JimParserCtx *pc);
+static int JimParseEol(struct JimParserCtx *pc);
+static int JimParseCmd(struct JimParserCtx *pc);
+static int JimParseVar(struct JimParserCtx *pc);
+static int JimParseBrace(struct JimParserCtx *pc);
+static int JimParseStr(struct JimParserCtx *pc);
+static int JimParseComment(struct JimParserCtx *pc);
+static char *JimParserGetToken(struct JimParserCtx *pc,
+        int *lenPtr, int *typePtr, int *linePtr);
+
+/* Initialize a parser context.
+ * 'prg' is a pointer to the program text, linenr is the line
+ * number of the first line contained in the program. */
+void JimParserInit(struct JimParserCtx *pc, const char *prg, 
+        int len, int linenr)
+{
+    pc->prg = prg;
+    pc->p = prg;
+    pc->len = len;
+    pc->tstart = NULL;
+    pc->tend = NULL;
+    pc->tline = 0;
+    pc->tt = JIM_TT_NONE;
+    pc->eof = 0;
+    pc->state = JIM_PS_DEF;
+    pc->linenr = linenr;
+    pc->comment = 1;
+}
+
+int JimParseScript(struct JimParserCtx *pc)
+{
+    while(1) { /* the while is used to reiterate with continue if needed */
+        if (!pc->len) {
+            pc->tstart = pc->p;
+            pc->tend = pc->p-1;
+            pc->tline = pc->linenr;
+            pc->tt = JIM_TT_EOL;
+            pc->eof = 1;
+            return JIM_OK;
+        }
+        switch(*(pc->p)) {
+        case '\\':
+            if (*(pc->p+1) == '\n')
+                return JimParseSep(pc);
+            else {
+                pc->comment = 0;
+                return JimParseStr(pc);
+            }
+            break;
+        case ' ':
+        case '\t':
+        case '\r':
+            if (pc->state == JIM_PS_DEF)
+                return JimParseSep(pc);
+            else {
+                pc->comment = 0;
+                return JimParseStr(pc);
+            }
+            break;
+        case '\n':
+        case ';':
+            pc->comment = 1;
+            if (pc->state == JIM_PS_DEF)
+                return JimParseEol(pc);
+            else
+                return JimParseStr(pc);
+            break;
+        case '[':
+            pc->comment = 0;
+            return JimParseCmd(pc);
+            break;
+        case '$':
+            pc->comment = 0;
+            if (JimParseVar(pc) == JIM_ERR) {
+                pc->tstart = pc->tend = pc->p++; pc->len--;
+                pc->tline = pc->linenr;
+                pc->tt = JIM_TT_STR;
+                return JIM_OK;
+            } else
+                return JIM_OK;
+            break;
+        case '#':
+            if (pc->comment) {
+                JimParseComment(pc);
+                continue;
+            } else {
+                return JimParseStr(pc);
+            }
+        default:
+            pc->comment = 0;
+            return JimParseStr(pc);
+            break;
+        }
+        return JIM_OK;
+    }
+}
+
+int JimParseSep(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (*pc->p == ' ' || *pc->p == '\t' || *pc->p == '\r' ||
+           (*pc->p == '\\' && *(pc->p+1) == '\n')) {
+        if (*pc->p == '\\') {
+            pc->p++; pc->len--;
+            pc->linenr++;
+        }
+        pc->p++; pc->len--;
+    }
+    pc->tend = pc->p-1;
+    pc->tt = JIM_TT_SEP;
+    return JIM_OK;
+}
+
+int JimParseEol(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (*pc->p == ' ' || *pc->p == '\n' ||
+           *pc->p == '\t' || *pc->p == '\r' || *pc->p == ';') {
+        if (*pc->p == '\n')
+            pc->linenr++;
+        pc->p++; pc->len--;
+    }
+    pc->tend = pc->p-1;
+    pc->tt = JIM_TT_EOL;
+    return JIM_OK;
+}
+
+/* Todo. Don't stop if ']' appears inside {} or quoted.
+ * Also should handle the case of puts [string length "]"] */
+int JimParseCmd(struct JimParserCtx *pc)
+{
+    int level = 1;
+    int blevel = 0;
+
+    pc->tstart = ++pc->p; pc->len--;
+    pc->tline = pc->linenr;
+    while (1) {
+        if (pc->len == 0) {
+            break;
+        } else if (*pc->p == '[' && blevel == 0) {
+            level++;
+        } else if (*pc->p == ']' && blevel == 0) {
+            level--;
+            if (!level) break;
+        } else if (*pc->p == '\\') {
+            pc->p++; pc->len--;
+        } else if (*pc->p == '{') {
+            blevel++;
+        } else if (*pc->p == '}') {
+            if (blevel != 0)
+                blevel--;
+        } else if (*pc->p == '\n')
+            pc->linenr++;
+        pc->p++; pc->len--;
+    }
+    pc->tend = pc->p-1;
+    pc->tt = JIM_TT_CMD;
+    if (*pc->p == ']') {
+        pc->p++; pc->len--;
+    }
+    return JIM_OK;
+}
+
+int JimParseVar(struct JimParserCtx *pc)
+{
+    int brace = 0, stop = 0, ttype = JIM_TT_VAR;
+
+    pc->tstart = ++pc->p; pc->len--; /* skip the $ */
+    pc->tline = pc->linenr;
+    if (*pc->p == '{') {
+        pc->tstart = ++pc->p; pc->len--;
+        brace = 1;
+    }
+    if (brace) {
+        while (!stop) {
+            if (*pc->p == '}' || pc->len == 0) {
+                stop = 1;
+                if (pc->len == 0)
+                    continue;
+            }
+            else if (*pc->p == '\n')
+                pc->linenr++;
+            pc->p++; pc->len--;
+        }
+        if (pc->len == 0)
+            pc->tend = pc->p-1;
+        else
+            pc->tend = pc->p-2;
+    } else {
+        while (!stop) {
+            if (!((*pc->p >= 'a' && *pc->p <= 'z') ||
+                (*pc->p >= 'A' && *pc->p <= 'Z') ||
+                (*pc->p >= '0' && *pc->p <= '9') || *pc->p == '_'))
+                stop = 1;
+            else {
+                pc->p++; pc->len--;
+            }
+        }
+        /* Parse [dict get] syntax sugar. */
+        if (*pc->p == '(') {
+            while (*pc->p != ')' && pc->len) {
+                pc->p++; pc->len--;
+                if (*pc->p == '\\' && pc->len >= 2) {
+                    pc->p += 2; pc->len -= 2;
+                }
+            }
+            if (*pc->p != '\0') {
+                pc->p++; pc->len--;
+            }
+            ttype = JIM_TT_DICTSUGAR;
+        }
+        pc->tend = pc->p-1;
+    }
+    /* Check if we parsed just the '$' character.
+     * That's not a variable so an error is returned
+     * to tell the state machine to consider this '$' just
+     * a string. */
+    if (pc->tstart == pc->p) {
+        pc->p--; pc->len++;
+        return JIM_ERR;
+    }
+    pc->tt = ttype;
+    return JIM_OK;
+}
+
+int JimParseBrace(struct JimParserCtx *pc)
+{
+    int level = 1;
+
+    pc->tstart = ++pc->p; pc->len--;
+    pc->tline = pc->linenr;
+    while (1) {
+        if (*pc->p == '\\' && pc->len >= 2) {
+            pc->p++; pc->len--;
+            if (*pc->p == '\n')
+                pc->linenr++;
+        } else if (*pc->p == '{') {
+            level++;
+        } else if (pc->len == 0 || *pc->p == '}') {
+            level--;
+            if (pc->len == 0 || level == 0) {
+                pc->tend = pc->p-1;
+                if (pc->len != 0) {
+                    pc->p++; pc->len--;
+                }
+                pc->tt = JIM_TT_STR;
+                return JIM_OK;
+            }
+        } else if (*pc->p == '\n') {
+            pc->linenr++;
+        }
+        pc->p++; pc->len--;
+    }
+    return JIM_OK; /* unreached */
+}
+
+int JimParseStr(struct JimParserCtx *pc)
+{
+    int newword = (pc->tt == JIM_TT_SEP || pc->tt == JIM_TT_EOL ||
+            pc->tt == JIM_TT_NONE || pc->tt == JIM_TT_STR);
+    if (newword && *pc->p == '{') {
+        return JimParseBrace(pc);
+    } else if (newword && *pc->p == '"') {
+        pc->state = JIM_PS_QUOTE;
+        pc->p++; pc->len--;
+    }
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (1) {
+        if (pc->len == 0) {
+            pc->tend = pc->p-1;
+            pc->tt = JIM_TT_ESC;
+            return JIM_OK;
+        }
+        switch(*pc->p) {
+        case '\\':
+            if (pc->state == JIM_PS_DEF &&
+                *(pc->p+1) == '\n') {
+                pc->tend = pc->p-1;
+                pc->tt = JIM_TT_ESC;
+                return JIM_OK;
+            }
+            if (pc->len >= 2) {
+                pc->p++; pc->len--;
+            }
+            break;
+        case '$':
+        case '[':
+            pc->tend = pc->p-1;
+            pc->tt = JIM_TT_ESC;
+            return JIM_OK;
+        case ' ':
+        case '\t':
+        case '\n':
+        case '\r':
+        case ';':
+            if (pc->state == JIM_PS_DEF) {
+                pc->tend = pc->p-1;
+                pc->tt = JIM_TT_ESC;
+                return JIM_OK;
+            } else if (*pc->p == '\n') {
+                pc->linenr++;
+            }
+            break;
+        case '"':
+            if (pc->state == JIM_PS_QUOTE) {
+                pc->tend = pc->p-1;
+                pc->tt = JIM_TT_ESC;
+                pc->p++; pc->len--;
+                pc->state = JIM_PS_DEF;
+                return JIM_OK;
+            }
+            break;
+        }
+        pc->p++; pc->len--;
+    }
+    return JIM_OK; /* unreached */
+}
+
+int JimParseComment(struct JimParserCtx *pc)
+{
+    while (*pc->p) {
+        if (*pc->p == '\n') {
+            pc->linenr++;
+            if (*(pc->p-1) != '\\') {
+                pc->p++; pc->len--;
+                return JIM_OK;
+            }
+        }
+        pc->p++; pc->len--;
+    }
+    return JIM_OK;
+}
+
+/* xdigitval and odigitval are helper functions for JimParserGetToken() */
+static int xdigitval(int c)
+{
+    if (c >= '0' && c <= '9') return c-'0';
+    if (c >= 'a' && c <= 'f') return c-'a'+10;
+    if (c >= 'A' && c <= 'F') return c-'A'+10;
+    return -1;
+}
+
+static int odigitval(int c)
+{
+    if (c >= '0' && c <= '7') return c-'0';
+    return -1;
+}
+
+/* Perform Tcl escape substitution of 's', storing the result
+ * string into 'dest'. The escaped string is guaranteed to
+ * be the same length or shorted than the source string.
+ * Slen is the length of the string at 's', if it's -1 the string
+ * length will be calculated by the function.
+ *
+ * The function returns the length of the resulting string. */
+static int JimEscape(char *dest, const char *s, int slen)
+{
+    char *p = dest;
+    int i, len;
+    
+    if (slen == -1)
+        slen = strlen(s);
+
+    for (i = 0; i < slen; i++) {
+        switch(s[i]) {
+        case '\\':
+            switch(s[i+1]) {
+            case 'a': *p++ = 0x7; i++; break;
+            case 'b': *p++ = 0x8; i++; break;
+            case 'f': *p++ = 0xc; i++; break;
+            case 'n': *p++ = 0xa; i++; break;
+            case 'r': *p++ = 0xd; i++; break;
+            case 't': *p++ = 0x9; i++; break;
+            case 'v': *p++ = 0xb; i++; break;
+            case '\0': *p++ = '\\'; i++; break;
+            case '\n': *p++ = ' '; i++; break;
+            default:
+                  if (s[i+1] == 'x') {
+                    int val = 0;
+                    int c = xdigitval(s[i+2]);
+                    if (c == -1) {
+                        *p++ = 'x';
+                        i++;
+                        break;
+                    }
+                    val = c;
+                    c = xdigitval(s[i+3]);
+                    if (c == -1) {
+                        *p++ = val;
+                        i += 2;
+                        break;
+                    }
+                    val = (val*16)+c;
+                    *p++ = val;
+                    i += 3;
+                    break;
+                  } else if (s[i+1] >= '0' && s[i+1] <= '7')
+                  {
+                    int val = 0;
+                    int c = odigitval(s[i+1]);
+                    val = c;
+                    c = odigitval(s[i+2]);
+                    if (c == -1) {
+                        *p++ = val;
+                        i ++;
+                        break;
+                    }
+                    val = (val*8)+c;
+                    c = odigitval(s[i+3]);
+                    if (c == -1) {
+                        *p++ = val;
+                        i += 2;
+                        break;
+                    }
+                    val = (val*8)+c;
+                    *p++ = val;
+                    i += 3;
+                  } else {
+                    *p++ = s[i+1];
+                    i++;
+                  }
+                  break;
+            }
+            break;
+        default:
+            *p++ = s[i];
+            break;
+        }
+    }
+    len = p-dest;
+    *p++ = '\0';
+    return len;
+}
+
+/* Returns a dynamically allocated copy of the current token in the
+ * parser context. The function perform conversion of escapes if
+ * the token is of type JIM_TT_ESC.
+ *
+ * Note that after the conversion, tokens that are grouped with
+ * braces in the source code, are always recognizable from the
+ * identical string obtained in a different way from the type.
+ *
+ * For exmple the string:
+ *
+ * {expand}$a
+ * 
+ * will return as first token "expand", of type JIM_TT_STR
+ *
+ * While the string:
+ *
+ * expand$a
+ *
+ * will return as first token "expand", of type JIM_TT_ESC
+ */
+char *JimParserGetToken(struct JimParserCtx *pc,
+        int *lenPtr, int *typePtr, int *linePtr)
+{
+    const char *start, *end;
+    char *token;
+    int len;
+
+    start = JimParserTstart(pc);
+    end = JimParserTend(pc);
+    if (start > end) {
+        if (lenPtr) *lenPtr = 0;
+        if (typePtr) *typePtr = JimParserTtype(pc);
+        if (linePtr) *linePtr = JimParserTline(pc);
+        token = Jim_Alloc(1);
+        token[0] = '\0';
+        return token;
+    }
+    len = (end-start)+1;
+    token = Jim_Alloc(len+1);
+    if (JimParserTtype(pc) != JIM_TT_ESC) {
+        /* No escape conversion needed? Just copy it. */
+        memcpy(token, start, len);
+        token[len] = '\0';
+    } else {
+        /* Else convert the escape chars. */
+        len = JimEscape(token, start, len);
+    }
+    if (lenPtr) *lenPtr = len;
+    if (typePtr) *typePtr = JimParserTtype(pc);
+    if (linePtr) *linePtr = JimParserTline(pc);
+    return token;
+}
+
+/* The following functin is not really part of the parsing engine of Jim,
+ * but it somewhat related. Given an string and its length, it tries
+ * to guess if the script is complete or there are instead " " or { }
+ * open and not completed. This is useful for interactive shells
+ * implementation and for [info complete].
+ *
+ * If 'stateCharPtr' != NULL, the function stores ' ' on complete script,
+ * '{' on scripts incomplete missing one or more '}' to be balanced.
+ * '"' on scripts incomplete missing a '"' char.
+ *
+ * If the script is complete, 1 is returned, otherwise 0. */
+int Jim_ScriptIsComplete(const char *s, int len, char *stateCharPtr)
+{
+    int level = 0;
+    int state = ' ';
+
+    while(len) {
+        switch (*s) {
+            case '\\':
+                if (len > 1)
+                    s++;
+                break;
+            case '"':
+                if (state == ' ') {
+                    state = '"';
+                } else if (state == '"') {
+                    state = ' ';
+                }
+                break;
+            case '{':
+                if (state == '{') {
+                    level++;
+                } else if (state == ' ') {
+                    state = '{';
+                    level++;
+                }
+                break;
+            case '}':
+                if (state == '{') {
+                    level--;
+                    if (level == 0)
+                        state = ' ';
+                }
+                break;
+        }
+        s++;
+        len--;
+    }
+    if (stateCharPtr)
+        *stateCharPtr = state;
+    return state == ' ';
+}
+
+/* -----------------------------------------------------------------------------
+ * Tcl Lists parsing
+ * ---------------------------------------------------------------------------*/
+static int JimParseListSep(struct JimParserCtx *pc);
+static int JimParseListStr(struct JimParserCtx *pc);
+
+int JimParseList(struct JimParserCtx *pc)
+{
+    if (pc->len == 0) {
+        pc->tstart = pc->tend = pc->p;
+        pc->tline = pc->linenr;
+        pc->tt = JIM_TT_EOL;
+        pc->eof = 1;
+        return JIM_OK;
+    }
+    switch(*pc->p) {
+    case ' ':
+    case '\n':
+    case '\t':
+    case '\r':
+        if (pc->state == JIM_PS_DEF)
+            return JimParseListSep(pc);
+        else
+            return JimParseListStr(pc);
+        break;
+    default:
+        return JimParseListStr(pc);
+        break;
+    }
+    return JIM_OK;
+}
+
+int JimParseListSep(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (*pc->p == ' ' || *pc->p == '\t' || *pc->p == '\r' || *pc->p == '\n')
+    {
+        pc->p++; pc->len--;
+    }
+    pc->tend = pc->p-1;
+    pc->tt = JIM_TT_SEP;
+    return JIM_OK;
+}
+
+int JimParseListStr(struct JimParserCtx *pc)
+{
+    int newword = (pc->tt == JIM_TT_SEP || pc->tt == JIM_TT_EOL ||
+            pc->tt == JIM_TT_NONE);
+    if (newword && *pc->p == '{') {
+        return JimParseBrace(pc);
+    } else if (newword && *pc->p == '"') {
+        pc->state = JIM_PS_QUOTE;
+        pc->p++; pc->len--;
+    }
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (1) {
+        if (pc->len == 0) {
+            pc->tend = pc->p-1;
+            pc->tt = JIM_TT_ESC;
+            return JIM_OK;
+        }
+        switch(*pc->p) {
+        case '\\':
+            pc->p++; pc->len--;
+            break;
+        case ' ':
+        case '\t':
+        case '\n':
+        case '\r':
+            if (pc->state == JIM_PS_DEF) {
+                pc->tend = pc->p-1;
+                pc->tt = JIM_TT_ESC;
+                return JIM_OK;
+            } else if (*pc->p == '\n') {
+                pc->linenr++;
+            }
+            break;
+        case '"':
+            if (pc->state == JIM_PS_QUOTE) {
+                pc->tend = pc->p-1;
+                pc->tt = JIM_TT_ESC;
+                pc->p++; pc->len--;
+                pc->state = JIM_PS_DEF;
+                return JIM_OK;
+            }
+            break;
+        }
+        pc->p++; pc->len--;
+    }
+    return JIM_OK; /* unreached */
+}
+
+/* -----------------------------------------------------------------------------
+ * Jim_Obj related functions
+ * ---------------------------------------------------------------------------*/
+
+/* Return a new initialized object. */
+Jim_Obj *Jim_NewObj(Jim_Interp *interp)
+{
+    Jim_Obj *objPtr;
+
+    /* -- Check if there are objects in the free list -- */
+    if (interp->freeList != NULL) {
+        /* -- Unlink the object from the free list -- */
+        objPtr = interp->freeList;
+        interp->freeList = objPtr->nextObjPtr;
+    } else {
+        /* -- No ready to use objects: allocate a new one -- */
+        objPtr = Jim_Alloc(sizeof(*objPtr));
+    }
+
+    /* Object is returned with refCount of 0. Every
+     * kind of GC implemented should take care to don't try
+     * to scan objects with refCount == 0. */
+    objPtr->refCount = 0;
+    /* All the other fields are left not initialized to save time.
+     * The caller will probably want set they to the right
+     * value anyway. */
+
+    /* -- Put the object into the live list -- */
+    objPtr->prevObjPtr = NULL;
+    objPtr->nextObjPtr = interp->liveList;
+    if (interp->liveList)
+        interp->liveList->prevObjPtr = objPtr;
+    interp->liveList = objPtr;
+
+    return objPtr;
+}
+
+/* Free an object. Actually objects are never freed, but
+ * just moved to the free objects list, where they will be
+ * reused by Jim_NewObj(). */
+void Jim_FreeObj(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    /* Check if the object was already freed, panic. */
+    if (objPtr->refCount != 0)  {
+        Jim_Panic(interp,"!!!Object %p freed with bad refcount %d", objPtr,
+                objPtr->refCount);
+    }
+    /* Free the internal representation */
+    Jim_FreeIntRep(interp, objPtr);
+    /* Free the string representation */
+    if (objPtr->bytes != NULL) {
+        if (objPtr->bytes != JimEmptyStringRep)
+            Jim_Free(objPtr->bytes);
+    }
+    /* Unlink the object from the live objects list */
+    if (objPtr->prevObjPtr)
+        objPtr->prevObjPtr->nextObjPtr = objPtr->nextObjPtr;
+    if (objPtr->nextObjPtr)
+        objPtr->nextObjPtr->prevObjPtr = objPtr->prevObjPtr;
+    if (interp->liveList == objPtr)
+        interp->liveList = objPtr->nextObjPtr;
+    /* Link the object into the free objects list */
+    objPtr->prevObjPtr = NULL;
+    objPtr->nextObjPtr = interp->freeList;
+    if (interp->freeList)
+        interp->freeList->prevObjPtr = objPtr;
+    interp->freeList = objPtr;
+    objPtr->refCount = -1;
+}
+
+/* Invalidate the string representation of an object. */
+void Jim_InvalidateStringRep(Jim_Obj *objPtr)
+{
+    if (objPtr->bytes != NULL) {
+        if (objPtr->bytes != JimEmptyStringRep)
+            Jim_Free(objPtr->bytes);
+    }
+    objPtr->bytes = NULL;
+}
+
+#define Jim_SetStringRep(o, b, l) \
+    do { (o)->bytes = b; (o)->length = l; } while (0)
+
+/* Set the initial string representation for an object.
+ * Does not try to free an old one. */
+void Jim_InitStringRep(Jim_Obj *objPtr, const char *bytes, int length)
+{
+    if (length == 0) {
+        objPtr->bytes = JimEmptyStringRep;
+        objPtr->length = 0;
+    } else {
+        objPtr->bytes = Jim_Alloc(length+1);
+        objPtr->length = length;
+        memcpy(objPtr->bytes, bytes, length);
+        objPtr->bytes[length] = '\0';
+    }
+}
+
+/* Duplicate an object. The returned object has refcount = 0. */
+Jim_Obj *Jim_DuplicateObj(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_Obj *dupPtr;
+
+    dupPtr = Jim_NewObj(interp);
+    if (objPtr->bytes == NULL) {
+        /* Object does not have a valid string representation. */
+        dupPtr->bytes = NULL;
+    } else {
+        Jim_InitStringRep(dupPtr, objPtr->bytes, objPtr->length);
+    }
+    if (objPtr->typePtr != NULL) {
+        if (objPtr->typePtr->dupIntRepProc == NULL) {
+            dupPtr->internalRep = objPtr->internalRep;
+        } else {
+            objPtr->typePtr->dupIntRepProc(interp, objPtr, dupPtr);
+        }
+        dupPtr->typePtr = objPtr->typePtr;
+    } else {
+        dupPtr->typePtr = NULL;
+    }
+    return dupPtr;
+}
+
+/* Return the string representation for objPtr. If the object
+ * string representation is invalid, calls the method to create
+ * a new one starting from the internal representation of the object. */
+const char *Jim_GetString(Jim_Obj *objPtr, int *lenPtr)
+{
+    if (objPtr->bytes == NULL) {
+        /* Invalid string repr. Generate it. */
+        if (objPtr->typePtr->updateStringProc == NULL) {
+            Jim_Panic(NULL,"UpdataStringProc called against '%s' type.",
+                objPtr->typePtr->name);
+        }
+        objPtr->typePtr->updateStringProc(objPtr);
+    }
+    if (lenPtr)
+        *lenPtr = objPtr->length;
+    return objPtr->bytes;
+}
+
+/* Just returns the length of the object's string rep */
+int Jim_Length(Jim_Obj *objPtr)
+{
+    int len;
+
+    Jim_GetString(objPtr, &len);
+    return len;
+}
+
+/* -----------------------------------------------------------------------------
+ * String Object
+ * ---------------------------------------------------------------------------*/
+static void DupStringInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static int SetStringFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static Jim_ObjType stringObjType = {
+    "string",
+    NULL,
+    DupStringInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+void DupStringInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+
+    /* This is a bit subtle: the only caller of this function
+     * should be Jim_DuplicateObj(), that will copy the
+     * string representaion. After the copy, the duplicated
+     * object will not have more room in teh buffer than
+     * srcPtr->length bytes. So we just set it to length. */
+    dupPtr->internalRep.strValue.maxLength = srcPtr->length;
+}
+
+int SetStringFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    /* Get a fresh string representation. */
+    (void) Jim_GetString(objPtr, NULL);
+    /* Free any other internal representation. */
+    Jim_FreeIntRep(interp, objPtr);
+    /* Set it as string, i.e. just set the maxLength field. */
+    objPtr->typePtr = &stringObjType;
+    objPtr->internalRep.strValue.maxLength = objPtr->length;
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_NewStringObj(Jim_Interp *interp, const char *s, int len)
+{
+    Jim_Obj *objPtr = Jim_NewObj(interp);
+
+    if (len == -1)
+        len = strlen(s);
+    /* Alloc/Set the string rep. */
+    if (len == 0) {
+        objPtr->bytes = JimEmptyStringRep;
+        objPtr->length = 0;
+    } else {
+        objPtr->bytes = Jim_Alloc(len+1);
+        objPtr->length = len;
+        memcpy(objPtr->bytes, s, len);
+        objPtr->bytes[len] = '\0';
+    }
+
+    /* No typePtr field for the vanilla string object. */
+    objPtr->typePtr = NULL;
+    return objPtr;
+}
+
+/* This version does not try to duplicate the 's' pointer, but
+ * use it directly. */
+Jim_Obj *Jim_NewStringObjNoAlloc(Jim_Interp *interp, char *s, int len)
+{
+    Jim_Obj *objPtr = Jim_NewObj(interp);
+
+    if (len == -1)
+        len = strlen(s);
+    Jim_SetStringRep(objPtr, s, len);
+    objPtr->typePtr = NULL;
+    return objPtr;
+}
+
+/* Low-level string append. Use it only against objects
+ * of type "string". */
+void StringAppendString(Jim_Obj *objPtr, const char *str, int len)
+{
+    int needlen;
+
+    if (len == -1)
+        len = strlen(str);
+    needlen = objPtr->length + len;
+    if (objPtr->internalRep.strValue.maxLength < needlen ||
+        objPtr->internalRep.strValue.maxLength == 0) {
+        if (objPtr->bytes == JimEmptyStringRep) {
+            objPtr->bytes = Jim_Alloc((needlen*2)+1);
+        } else {
+            objPtr->bytes = Jim_Realloc(objPtr->bytes, (needlen*2)+1);
+        }
+        objPtr->internalRep.strValue.maxLength = needlen*2;
+    }
+    memcpy(objPtr->bytes + objPtr->length, str, len);
+    objPtr->bytes[objPtr->length+len] = '\0';
+    objPtr->length += len;
+}
+
+/* Low-level wrapper to append an object. */
+void StringAppendObj(Jim_Obj *objPtr, Jim_Obj *appendObjPtr)
+{
+    int len;
+    const char *str;
+
+    str = Jim_GetString(appendObjPtr, &len);
+    StringAppendString(objPtr, str, len);
+}
+
+/* Higher level API to append strings to objects. */
+void Jim_AppendString(Jim_Interp *interp, Jim_Obj *objPtr, const char *str,
+        int len)
+{
+    if (Jim_IsShared(objPtr))
+        Jim_Panic(interp,"Jim_AppendString called with shared object");
+    if (objPtr->typePtr != &stringObjType)
+        SetStringFromAny(interp, objPtr);
+    StringAppendString(objPtr, str, len);
+}
+
+void Jim_AppendObj(Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *appendObjPtr)
+{
+    int len;
+    const char *str;
+
+    str = Jim_GetString(appendObjPtr, &len);
+    Jim_AppendString(interp, objPtr, str, len);
+}
+
+void Jim_AppendStrings(Jim_Interp *interp, Jim_Obj *objPtr, ...)
+{
+    va_list ap;
+
+    if (objPtr->typePtr != &stringObjType)
+        SetStringFromAny(interp, objPtr);
+    va_start(ap, objPtr);
+    while (1) {
+        char *s = va_arg(ap, char*);
+
+        if (s == NULL) break;
+        Jim_AppendString(interp, objPtr, s, -1);
+    }
+    va_end(ap);
+}
+
+int Jim_StringEqObj(Jim_Obj *aObjPtr, Jim_Obj *bObjPtr, int nocase)
+{
+    const char *aStr, *bStr;
+    int aLen, bLen, i;
+
+    if (aObjPtr == bObjPtr) return 1;
+    aStr = Jim_GetString(aObjPtr, &aLen);
+    bStr = Jim_GetString(bObjPtr, &bLen);
+    if (aLen != bLen) return 0;
+    if (nocase == 0)
+        return memcmp(aStr, bStr, aLen) == 0;
+    for (i = 0; i < aLen; i++) {
+        if (tolower((int)aStr[i]) != tolower((int)bStr[i]))
+            return 0;
+    }
+    return 1;
+}
+
+int Jim_StringMatchObj(Jim_Obj *patternObjPtr, Jim_Obj *objPtr,
+        int nocase)
+{
+    const char *pattern, *string;
+    int patternLen, stringLen;
+
+    pattern = Jim_GetString(patternObjPtr, &patternLen);
+    string = Jim_GetString(objPtr, &stringLen);
+    return JimStringMatch(pattern, patternLen, string, stringLen, nocase);
+}
+
+int Jim_StringCompareObj(Jim_Obj *firstObjPtr,
+        Jim_Obj *secondObjPtr, int nocase)
+{
+    const char *s1, *s2;
+    int l1, l2;
+
+    s1 = Jim_GetString(firstObjPtr, &l1);
+    s2 = Jim_GetString(secondObjPtr, &l2);
+    return JimStringCompare(s1, l1, s2, l2, nocase);
+}
+
+/* Convert a range, as returned by Jim_GetRange(), into
+ * an absolute index into an object of the specified length.
+ * This function may return negative values, or values
+ * bigger or equal to the length of the list if the index
+ * is out of range. */
+static int JimRelToAbsIndex(int len, int index)
+{
+    if (index < 0)
+        return len + index;
+    return index;
+}
+
+/* Convert a pair of index as normalize by JimRelToAbsIndex(),
+ * into a range stored in *firstPtr, *lastPtr, *rangeLenPtr, suitable
+ * for implementation of commands like [string range] and [lrange].
+ *
+ * The resulting range is guaranteed to address valid elements of
+ * the structure. */
+static void JimRelToAbsRange(int len, int first, int last,
+        int *firstPtr, int *lastPtr, int *rangeLenPtr)
+{
+    int rangeLen;
+
+    if (first > last) {
+        rangeLen = 0;
+    } else {
+        rangeLen = last-first+1;
+        if (rangeLen) {
+            if (first < 0) {
+                rangeLen += first;
+                first = 0;
+            }
+            if (last >= len) {
+                rangeLen -= (last-(len-1));
+                last = len-1;
+            }
+        }
+    }
+    if (rangeLen < 0) rangeLen = 0;
+
+    *firstPtr = first;
+    *lastPtr = last;
+    *rangeLenPtr = rangeLen;
+}
+
+Jim_Obj *Jim_StringRangeObj(Jim_Interp *interp,
+        Jim_Obj *strObjPtr, Jim_Obj *firstObjPtr, Jim_Obj *lastObjPtr)
+{
+    int first, last;
+    const char *str;
+    int len, rangeLen;
+
+    if (Jim_GetIndex(interp, firstObjPtr, &first) != JIM_OK ||
+        Jim_GetIndex(interp, lastObjPtr, &last) != JIM_OK)
+        return NULL;
+    str = Jim_GetString(strObjPtr, &len);
+    first = JimRelToAbsIndex(len, first);
+    last = JimRelToAbsIndex(len, last);
+    JimRelToAbsRange(len, first, last, &first, &last, &rangeLen);
+    return Jim_NewStringObj(interp, str+first, rangeLen);
+}
+
+static Jim_Obj *JimStringToLower(Jim_Interp *interp, Jim_Obj *strObjPtr)
+{
+    char *buf = Jim_Alloc(strObjPtr->length+1);
+    int i;
+
+    memcpy(buf, strObjPtr->bytes, strObjPtr->length+1);
+    for (i = 0; i < strObjPtr->length; i++)
+        buf[i] = tolower(buf[i]);
+    return Jim_NewStringObjNoAlloc(interp, buf, strObjPtr->length);
+}
+
+static Jim_Obj *JimStringToUpper(Jim_Interp *interp, Jim_Obj *strObjPtr)
+{
+    char *buf = Jim_Alloc(strObjPtr->length+1);
+    int i;
+
+    memcpy(buf, strObjPtr->bytes, strObjPtr->length+1);
+    for (i = 0; i < strObjPtr->length; i++)
+        buf[i] = toupper(buf[i]);
+    return Jim_NewStringObjNoAlloc(interp, buf, strObjPtr->length);
+}
+
+/* This is the core of the [format] command.
+ * TODO: Lots of things work - via a hack
+ *       However, no format item can be >= JIM_MAX_FMT 
+ */
+Jim_Obj *Jim_FormatString(Jim_Interp *interp, Jim_Obj *fmtObjPtr,
+        int objc, Jim_Obj *const *objv)
+{
+    const char *fmt, *_fmt;
+    int fmtLen;
+    Jim_Obj *resObjPtr;
+    
+
+    fmt = Jim_GetString(fmtObjPtr, &fmtLen);
+	_fmt = fmt;
+    resObjPtr = Jim_NewStringObj(interp, "", 0);
+    while (fmtLen) {
+        const char *p = fmt;
+        char spec[2], c;
+        jim_wide wideValue;
+		double doubleValue;
+		/* we cheat and use Sprintf()! */
+#define JIM_MAX_FMT 2048
+		char sprintf_buf[JIM_MAX_FMT];
+		char fmt_str[100];
+		char *cp;
+		int width;
+		int ljust;
+		int zpad;
+		int spad;
+		int altfm;
+		int forceplus;
+		int prec;
+		int inprec;
+		int haveprec;
+		int accum;
+
+        while (*fmt != '%' && fmtLen) {
+            fmt++; fmtLen--;
+        }
+        Jim_AppendString(interp, resObjPtr, p, fmt-p);
+        if (fmtLen == 0)
+            break;
+        fmt++; fmtLen--; /* skip '%' */
+		zpad = 0;
+		spad = 0;
+		width = -1;
+		ljust = 0;
+		altfm = 0;
+		forceplus = 0;
+		inprec = 0;
+		haveprec = 0;
+		prec = -1; /* not found yet */
+    next_fmt:
+		if( fmtLen <= 0 ){
+			break;
+		}
+		switch( *fmt ){
+			/* terminals */
+        case 'b': /* binary - not all printfs() do this */
+		case 's': /* string */
+		case 'i': /* integer */
+		case 'd': /* decimal */
+		case 'x': /* hex */
+		case 'X': /* CAP hex */
+		case 'c': /* char */
+		case 'o': /* octal */
+		case 'u': /* unsigned */
+		case 'f': /* float */
+			break;
+			
+			/* non-terminals */
+		case '0': /* zero pad */
+			zpad = 1;
+			*fmt++;  fmtLen--;
+			goto next_fmt;
+			break;
+		case '+':
+			forceplus = 1;
+			*fmt++;  fmtLen--;
+			goto next_fmt;
+			break;
+		case ' ': /* sign space */
+			spad = 1;
+			*fmt++;  fmtLen--;
+			goto next_fmt;
+			break;
+		case '-':
+			ljust = 1;
+			*fmt++;  fmtLen--;
+			goto next_fmt;
+			break;
+		case '#':
+			altfm = 1;
+			*fmt++; fmtLen--;
+ 			goto next_fmt;
+
+		case '.':
+			inprec = 1;
+			*fmt++; fmtLen--;
+ 			goto next_fmt;
+			break;
+		case '1':
+		case '2':
+		case '3':
+		case '4':
+		case '5':
+		case '6':
+		case '7':
+		case '8':
+		case '9':
+			accum = 0;
+			while( isdigit(*fmt) && (fmtLen > 0) ){
+				accum = (accum * 10) + (*fmt - '0');
+				fmt++;  fmtLen--;
+			}
+			if( inprec ){
+				haveprec = 1;
+				prec = accum;
+			} else {
+				width = accum;
+			}
+			goto next_fmt;
+		case '*':
+			/* suck up the next item as an integer */
+			*fmt++;  fmtLen--;
+			objc--;
+			if( objc <= 0 ){
+				goto not_enough_args;
+			}
+			if( Jim_GetWide(interp,objv[0],&wideValue )== JIM_ERR ){
+				Jim_FreeNewObj(interp, resObjPtr );
+				return NULL;
+			}
+			if( inprec ){
+				haveprec = 1;
+				prec = wideValue;
+				if( prec < 0 ){
+					/* man 3 printf says */
+					/* if prec is negative, it is zero */
+					prec = 0;
+				}
+			} else {
+				width = wideValue;
+				if( width < 0 ){
+					ljust = 1;
+					width = -width;
+				}
+			}
+			objv++;
+			goto next_fmt;
+			break;
+		}
+		
+		
+		if (*fmt != '%') {
+            if (objc == 0) {
+			not_enough_args:
+                Jim_FreeNewObj(interp, resObjPtr);
+                Jim_SetResultString(interp,
+									"not enough arguments for all format specifiers", -1);
+                return NULL;
+            } else {
+                objc--;
+            }
+        }
+		
+		/*
+		 * Create the formatter
+		 * cause we cheat and use sprintf()
+		 */
+		cp = fmt_str;
+		*cp++ = '%';
+		if( altfm ){
+			*cp++ = '#';
+		}
+		if( forceplus ){
+			*cp++ = '+';
+		} else if( spad ){
+			/* PLUS overrides */
+			*cp++ = ' ';
+		}
+		if( ljust ){
+			*cp++ = '-';
+		}
+		if( zpad  ){
+			*cp++ = '0';
+		}
+		if( width > 0 ){
+			sprintf( cp, "%d", width );
+			/* skip ahead */
+			cp = strchr(cp,0);
+		}
+		/* did we find a period? */
+		if( inprec ){
+			/* then add it */
+			*cp++ = '.';
+			/* did something occur after the period? */
+			if( haveprec ){
+				sprintf( cp, "%d", prec );
+			}
+			cp = strchr(cp,0);
+		}
+		*cp = 0;
+
+		/* here we do the work */
+		/* actually - we make sprintf() do it for us */
+        switch(*fmt) {
+        case 's':
+			*cp++ = 's';
+			*cp   = 0;
+			/* BUG: we do not handled embeded NULLs */
+			snprintf( sprintf_buf, JIM_MAX_FMT, fmt_str, Jim_GetString( objv[0], NULL ));
+            break;
+        case 'c':
+			*cp++ = 'c';
+			*cp   = 0;
+            if (Jim_GetWide(interp, objv[0], &wideValue) == JIM_ERR) {
+                Jim_FreeNewObj(interp, resObjPtr);
+                return NULL;
+            }
+            c = (char) wideValue;
+			snprintf( sprintf_buf, JIM_MAX_FMT, fmt_str, c );
+            break;
+		case 'f':
+		case 'F':
+		case 'g':
+		case 'G':
+		case 'e':
+		case 'E':
+			*cp++ = *fmt;
+			*cp   = 0;
+			if( Jim_GetDouble( interp, objv[0], &doubleValue ) == JIM_ERR ){
+				Jim_FreeNewObj( interp, resObjPtr );
+				return NULL;
+			}
+			snprintf( sprintf_buf, JIM_MAX_FMT, fmt_str, doubleValue );
+			break;
+        case 'b':
+        case 'd':
+		case 'i':
+		case 'u':
+		case 'x':
+		case 'X':
+			/* jim widevaluse are 64bit */
+			if( sizeof(jim_wide) == sizeof(long long) ){
+				*cp++ = 'l'; 
+				*cp++ = 'l';
+			} else {
+				*cp++ = 'l';
+			}
+			*cp++ = *fmt;
+			*cp   = 0;
+            if (Jim_GetWide(interp, objv[0], &wideValue) == JIM_ERR) {
+                Jim_FreeNewObj(interp, resObjPtr);
+                return NULL;
+            }
+			snprintf(sprintf_buf, JIM_MAX_FMT, fmt_str, wideValue );
+            break;
+        case '%':
+			sprintf_buf[0] = '%';
+			sprintf_buf[1] = 0;
+			objv--; /* undo the objv++ below */
+            break;
+        default:
+            spec[0] = *fmt; spec[1] = '\0';
+            Jim_FreeNewObj(interp, resObjPtr);
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "bad field specifier \"",  spec, "\"", NULL);
+            return NULL;
+        }
+		/* force terminate */
+#if 0
+		printf("FMT was: %s\n", fmt_str );
+		printf("RES was: |%s|\n", sprintf_buf );
+#endif
+		
+		sprintf_buf[ JIM_MAX_FMT - 1] = 0;
+		Jim_AppendString( interp, resObjPtr, sprintf_buf, strlen(sprintf_buf) );
+		/* next obj */
+		objv++;
+        fmt++;
+        fmtLen--;
+    }
+    return resObjPtr;
+}
+
+/* -----------------------------------------------------------------------------
+ * Compared String Object
+ * ---------------------------------------------------------------------------*/
+
+/* This is strange object that allows to compare a C literal string
+ * with a Jim object in very short time if the same comparison is done
+ * multiple times. For example every time the [if] command is executed,
+ * Jim has to check if a given argument is "else". This comparions if
+ * the code has no errors are true most of the times, so we can cache
+ * inside the object the pointer of the string of the last matching
+ * comparison. Because most C compilers perform literal sharing,
+ * so that: char *x = "foo", char *y = "foo", will lead to x == y,
+ * this works pretty well even if comparisons are at different places
+ * inside the C code. */
+
+static Jim_ObjType comparedStringObjType = {
+    "compared-string",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+/* The only way this object is exposed to the API is via the following
+ * function. Returns true if the string and the object string repr.
+ * are the same, otherwise zero is returned.
+ *
+ * Note: this isn't binary safe, but it hardly needs to be.*/
+int Jim_CompareStringImmediate(Jim_Interp *interp, Jim_Obj *objPtr,
+        const char *str)
+{
+    if (objPtr->typePtr == &comparedStringObjType &&
+        objPtr->internalRep.ptr == str)
+        return 1;
+    else {
+        const char *objStr = Jim_GetString(objPtr, NULL);
+        if (strcmp(str, objStr) != 0) return 0;
+        if (objPtr->typePtr != &comparedStringObjType) {
+            Jim_FreeIntRep(interp, objPtr);
+            objPtr->typePtr = &comparedStringObjType;
+        }
+        objPtr->internalRep.ptr = (char*)str; /*ATTENTION: const cast */
+        return 1;
+    }
+}
+
+int qsortCompareStringPointers(const void *a, const void *b)
+{
+    char * const *sa = (char * const *)a;
+    char * const *sb = (char * const *)b;
+    return strcmp(*sa, *sb);
+}
+
+int Jim_GetEnum(Jim_Interp *interp, Jim_Obj *objPtr,
+        const char **tablePtr, int *indexPtr, const char *name, int flags)
+{
+    const char **entryPtr = NULL;
+    char **tablePtrSorted;
+    int i, count = 0;
+
+    *indexPtr = -1;
+    for (entryPtr = tablePtr, i = 0; *entryPtr != NULL; entryPtr++, i++) {
+        if (Jim_CompareStringImmediate(interp, objPtr, *entryPtr)) {
+            *indexPtr = i;
+            return JIM_OK;
+        }
+        count++; /* If nothing matches, this will reach the len of tablePtr */
+    }
+    if (flags & JIM_ERRMSG) {
+        if (name == NULL)
+            name = "option";
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "bad ", name, " \"", Jim_GetString(objPtr, NULL), "\": must be one of ",
+            NULL);
+        tablePtrSorted = Jim_Alloc(sizeof(char*)*count);
+        memcpy(tablePtrSorted, tablePtr, sizeof(char*)*count);
+        qsort(tablePtrSorted, count, sizeof(char*), qsortCompareStringPointers);
+        for (i = 0; i < count; i++) {
+            if (i+1 == count && count > 1)
+                Jim_AppendString(interp, Jim_GetResult(interp), "or ", -1);
+            Jim_AppendString(interp, Jim_GetResult(interp),
+                    tablePtrSorted[i], -1);
+            if (i+1 != count)
+                Jim_AppendString(interp, Jim_GetResult(interp), ", ", -1);
+        }
+        Jim_Free(tablePtrSorted);
+    }
+    return JIM_ERR;
+}
+
+/* -----------------------------------------------------------------------------
+ * Source Object
+ *
+ * This object is just a string from the language point of view, but
+ * in the internal representation it contains the filename and line number
+ * where this given token was read. This information is used by
+ * Jim_EvalObj() if the object passed happens to be of type "source".
+ *
+ * This allows to propagate the information about line numbers and file
+ * names and give error messages with absolute line numbers.
+ *
+ * Note that this object uses shared strings for filenames, and the
+ * pointer to the filename together with the line number is taken into
+ * the space for the "inline" internal represenation of the Jim_Object,
+ * so there is almost memory zero-overhead.
+ *
+ * Also the object will be converted to something else if the given
+ * token it represents in the source file is not something to be
+ * evaluated (not a script), and will be specialized in some other way,
+ * so the time overhead is alzo null.
+ * ---------------------------------------------------------------------------*/
+
+static void FreeSourceInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupSourceInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+
+static Jim_ObjType sourceObjType = {
+    "source",
+    FreeSourceInternalRep,
+    DupSourceInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+void FreeSourceInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_ReleaseSharedString(interp,
+            objPtr->internalRep.sourceValue.fileName);
+}
+
+void DupSourceInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    dupPtr->internalRep.sourceValue.fileName =
+        Jim_GetSharedString(interp,
+                srcPtr->internalRep.sourceValue.fileName);
+    dupPtr->internalRep.sourceValue.lineNumber =
+        dupPtr->internalRep.sourceValue.lineNumber;
+    dupPtr->typePtr = &sourceObjType;
+}
+
+static void JimSetSourceInfo(Jim_Interp *interp, Jim_Obj *objPtr,
+        const char *fileName, int lineNumber)
+{
+    if (Jim_IsShared(objPtr))
+        Jim_Panic(interp,"JimSetSourceInfo called with shared object");
+    if (objPtr->typePtr != NULL)
+        Jim_Panic(interp,"JimSetSourceInfo called with typePtr != NULL");
+    objPtr->internalRep.sourceValue.fileName =
+        Jim_GetSharedString(interp, fileName);
+    objPtr->internalRep.sourceValue.lineNumber = lineNumber;
+    objPtr->typePtr = &sourceObjType;
+}
+
+/* -----------------------------------------------------------------------------
+ * Script Object
+ * ---------------------------------------------------------------------------*/
+
+#define JIM_CMDSTRUCT_EXPAND -1
+
+static void FreeScriptInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupScriptInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static int SetScriptFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static Jim_ObjType scriptObjType = {
+    "script",
+    FreeScriptInternalRep,
+    DupScriptInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+/* The ScriptToken structure represents every token into a scriptObj.
+ * Every token contains an associated Jim_Obj that can be specialized
+ * by commands operating on it. */
+typedef struct ScriptToken {
+    int type;
+    Jim_Obj *objPtr;
+    int linenr;
+} ScriptToken;
+
+/* This is the script object internal representation. An array of
+ * ScriptToken structures, with an associated command structure array.
+ * The command structure is a pre-computed representation of the
+ * command length and arguments structure as a simple liner array
+ * of integers.
+ * 
+ * For example the script:
+ *
+ * puts hello
+ * set $i $x$y [foo]BAR
+ *
+ * will produce a ScriptObj with the following Tokens:
+ *
+ * ESC puts
+ * SEP
+ * ESC hello
+ * EOL
+ * ESC set
+ * EOL
+ * VAR i
+ * SEP
+ * VAR x
+ * VAR y
+ * SEP
+ * CMD foo
+ * ESC BAR
+ * EOL
+ *
+ * This is a description of the tokens, separators, and of lines.
+ * The command structure instead represents the number of arguments
+ * of every command, followed by the tokens of which every argument
+ * is composed. So for the example script, the cmdstruct array will
+ * contain:
+ *
+ * 2 1 1 4 1 1 2 2
+ *
+ * Because "puts hello" has two args (2), composed of single tokens (1 1)
+ * While "set $i $x$y [foo]BAR" has four (4) args, the first two
+ * composed of single tokens (1 1) and the last two of double tokens
+ * (2 2).
+ *
+ * The precomputation of the command structure makes Jim_Eval() faster,
+ * and simpler because there aren't dynamic lengths / allocations.
+ *
+ * -- {expand} handling --
+ *
+ * Expand is handled in a special way. When a command
+ * contains at least an argument with the {expand} prefix,
+ * the command structure presents a -1 before the integer
+ * describing the number of arguments. This is used in order
+ * to send the command exection to a different path in case
+ * of {expand} and guarantee a fast path for the more common
+ * case. Also, the integers describing the number of tokens
+ * are expressed with negative sign, to allow for fast check
+ * of what's an {expand}-prefixed argument and what not.
+ *
+ * For example the command:
+ *
+ * list {expand}{1 2}
+ *
+ * Will produce the following cmdstruct array:
+ *
+ * -1 2 1 -2
+ *
+ * -- the substFlags field of the structure --
+ *
+ * The scriptObj structure is used to represent both "script" objects
+ * and "subst" objects. In the second case, the cmdStruct related
+ * fields are not used at all, but there is an additional field used
+ * that is 'substFlags': this represents the flags used to turn
+ * the string into the intenral representation used to perform the
+ * substitution. If this flags are not what the application requires
+ * the scriptObj is created again. For example the script:
+ *
+ * subst -nocommands $string
+ * subst -novariables $string
+ *
+ * Will recreate the internal representation of the $string object
+ * two times.
+ */
+typedef struct ScriptObj {
+    int len; /* Length as number of tokens. */
+    int commands; /* number of top-level commands in script. */
+    ScriptToken *token; /* Tokens array. */
+    int *cmdStruct; /* commands structure */
+    int csLen; /* length of the cmdStruct array. */
+    int substFlags; /* flags used for the compilation of "subst" objects */
+    int inUse; /* Used to share a ScriptObj. Currently
+              only used by Jim_EvalObj() as protection against
+              shimmering of the currently evaluated object. */
+    char *fileName;
+} ScriptObj;
+
+void FreeScriptInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int i;
+    struct ScriptObj *script = (void*) objPtr->internalRep.ptr;
+
+    script->inUse--;
+    if (script->inUse != 0) return;
+    for (i = 0; i < script->len; i++) {
+        if (script->token[i].objPtr != NULL)
+            Jim_DecrRefCount(interp, script->token[i].objPtr);
+    }
+    Jim_Free(script->token);
+    Jim_Free(script->cmdStruct);
+    Jim_Free(script->fileName);
+    Jim_Free(script);
+}
+
+void DupScriptInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+    JIM_NOTUSED(srcPtr);
+
+    /* Just returns an simple string. */
+    dupPtr->typePtr = NULL;
+}
+
+/* Add a new token to the internal repr of a script object */
+static void ScriptObjAddToken(Jim_Interp *interp, struct ScriptObj *script,
+        char *strtoken, int len, int type, char *filename, int linenr)
+{
+    int prevtype;
+    struct ScriptToken *token;
+
+    prevtype = (script->len == 0) ? JIM_TT_EOL : \
+        script->token[script->len-1].type;
+    /* Skip tokens without meaning, like words separators
+     * following a word separator or an end of command and
+     * so on. */
+    if (prevtype == JIM_TT_EOL) {
+        if (type == JIM_TT_EOL || type == JIM_TT_SEP) {
+            Jim_Free(strtoken);
+            return;
+        }
+    } else if (prevtype == JIM_TT_SEP) {
+        if (type == JIM_TT_SEP) {
+            Jim_Free(strtoken);
+            return;
+        } else if (type == JIM_TT_EOL) {
+            /* If an EOL is following by a SEP, drop the previous
+             * separator. */
+            script->len--;
+            Jim_DecrRefCount(interp, script->token[script->len].objPtr);
+        }
+    } else if (prevtype != JIM_TT_EOL && prevtype != JIM_TT_SEP &&
+            type == JIM_TT_ESC && len == 0)
+    {
+        /* Don't add empty tokens used in interpolation */
+        Jim_Free(strtoken);
+        return;
+    }
+    /* Make space for a new istruction */
+    script->len++;
+    script->token = Jim_Realloc(script->token,
+            sizeof(ScriptToken)*script->len);
+    /* Initialize the new token */
+    token = script->token+(script->len-1);
+    token->type = type;
+    /* Every object is intially as a string, but the
+     * internal type may be specialized during execution of the
+     * script. */
+    token->objPtr = Jim_NewStringObjNoAlloc(interp, strtoken, len);
+    /* To add source info to SEP and EOL tokens is useless because
+     * they will never by called as arguments of Jim_EvalObj(). */
+    if (filename && type != JIM_TT_SEP && type != JIM_TT_EOL)
+        JimSetSourceInfo(interp, token->objPtr, filename, linenr);
+    Jim_IncrRefCount(token->objPtr);
+    token->linenr = linenr;
+}
+
+/* Add an integer into the command structure field of the script object. */
+static void ScriptObjAddInt(struct ScriptObj *script, int val)
+{
+    script->csLen++;
+    script->cmdStruct = Jim_Realloc(script->cmdStruct,
+                    sizeof(int)*script->csLen);
+    script->cmdStruct[script->csLen-1] = val;
+}
+
+/* Search a Jim_Obj contained in 'script' with the same stinrg repr.
+ * of objPtr. Search nested script objects recursively. */
+static Jim_Obj *ScriptSearchLiteral(Jim_Interp *interp, ScriptObj *script,
+        ScriptObj *scriptBarrier, Jim_Obj *objPtr)
+{
+    int i;
+
+    for (i = 0; i < script->len; i++) {
+        if (script->token[i].objPtr != objPtr &&
+            Jim_StringEqObj(script->token[i].objPtr, objPtr, 0)) {
+            return script->token[i].objPtr;
+        }
+        /* Enter recursively on scripts only if the object
+         * is not the same as the one we are searching for
+         * shared occurrences. */
+        if (script->token[i].objPtr->typePtr == &scriptObjType &&
+            script->token[i].objPtr != objPtr) {
+            Jim_Obj *foundObjPtr;
+
+            ScriptObj *subScript =
+                script->token[i].objPtr->internalRep.ptr;
+            /* Don't recursively enter the script we are trying
+             * to make shared to avoid circular references. */
+            if (subScript == scriptBarrier) continue;
+            if (subScript != script) {
+                foundObjPtr =
+                    ScriptSearchLiteral(interp, subScript,
+                            scriptBarrier, objPtr);
+                if (foundObjPtr != NULL)
+                    return foundObjPtr;
+            }
+        }
+    }
+    return NULL;
+}
+
+/* Share literals of a script recursively sharing sub-scripts literals. */
+static void ScriptShareLiterals(Jim_Interp *interp, ScriptObj *script,
+        ScriptObj *topLevelScript)
+{
+    int i, j;
+
+    return;
+    /* Try to share with toplevel object. */
+    if (topLevelScript != NULL) {
+        for (i = 0; i < script->len; i++) {
+            Jim_Obj *foundObjPtr;
+            char *str = script->token[i].objPtr->bytes;
+
+            if (script->token[i].objPtr->refCount != 1) continue;
+            if (script->token[i].objPtr->typePtr == &scriptObjType) continue;
+            if (strchr(str, ' ') || strchr(str, '\n')) continue;
+            foundObjPtr = ScriptSearchLiteral(interp,
+                    topLevelScript,
+                    script, /* barrier */
+                    script->token[i].objPtr);
+            if (foundObjPtr != NULL) {
+                Jim_IncrRefCount(foundObjPtr);
+                Jim_DecrRefCount(interp,
+                        script->token[i].objPtr);
+                script->token[i].objPtr = foundObjPtr;
+            }
+        }
+    }
+    /* Try to share locally */
+    for (i = 0; i < script->len; i++) {
+        char *str = script->token[i].objPtr->bytes;
+
+        if (script->token[i].objPtr->refCount != 1) continue;
+        if (strchr(str, ' ') || strchr(str, '\n')) continue;
+        for (j = 0; j < script->len; j++) {
+            if (script->token[i].objPtr !=
+                    script->token[j].objPtr &&
+                Jim_StringEqObj(script->token[i].objPtr,
+                            script->token[j].objPtr, 0))
+            {
+                Jim_IncrRefCount(script->token[j].objPtr);
+                Jim_DecrRefCount(interp,
+                        script->token[i].objPtr);
+                script->token[i].objPtr =
+                    script->token[j].objPtr;
+            }
+        }
+    }
+}
+
+/* This method takes the string representation of an object
+ * as a Tcl script, and generates the pre-parsed internal representation
+ * of the script. */
+int SetScriptFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    int scriptTextLen;
+    const char *scriptText = Jim_GetString(objPtr, &scriptTextLen);
+    struct JimParserCtx parser;
+    struct ScriptObj *script = Jim_Alloc(sizeof(*script));
+    ScriptToken *token;
+    int args, tokens, start, end, i;
+    int initialLineNumber;
+    int propagateSourceInfo = 0;
+
+    script->len = 0;
+    script->csLen = 0;
+    script->commands = 0;
+    script->token = NULL;
+    script->cmdStruct = NULL;
+    script->inUse = 1;
+    /* Try to get information about filename / line number */
+    if (objPtr->typePtr == &sourceObjType) {
+        script->fileName =
+            Jim_StrDup(objPtr->internalRep.sourceValue.fileName);
+        initialLineNumber = objPtr->internalRep.sourceValue.lineNumber;
+        propagateSourceInfo = 1;
+    } else {
+        script->fileName = Jim_StrDup("?");
+        initialLineNumber = 1;
+    }
+
+    JimParserInit(&parser, scriptText, scriptTextLen, initialLineNumber);
+    while(!JimParserEof(&parser)) {
+        char *token;
+        int len, type, linenr;
+
+        JimParseScript(&parser);
+        token = JimParserGetToken(&parser, &len, &type, &linenr);
+        ScriptObjAddToken(interp, script, token, len, type,
+                propagateSourceInfo ? script->fileName : NULL,
+                linenr);
+    }
+    token = script->token;
+
+    /* Compute the command structure array
+     * (see the ScriptObj struct definition for more info) */
+    start = 0; /* Current command start token index */
+    end = -1; /* Current command end token index */
+    while (1) {
+        int expand = 0; /* expand flag. set to 1 on {expand} form. */
+        int interpolation = 0; /* set to 1 if there is at least one
+                      argument of the command obtained via
+                      interpolation of more tokens. */
+        /* Search for the end of command, while
+         * count the number of args. */
+        start = ++end;
+        if (start >= script->len) break;
+        args = 1; /* Number of args in current command */
+        while (token[end].type != JIM_TT_EOL) {
+            if (end == 0 || token[end-1].type == JIM_TT_SEP ||
+                    token[end-1].type == JIM_TT_EOL)
+            {
+                if (token[end].type == JIM_TT_STR &&
+                    token[end+1].type != JIM_TT_SEP &&
+                    token[end+1].type != JIM_TT_EOL &&
+                    (!strcmp(token[end].objPtr->bytes, "expand") ||
+                     !strcmp(token[end].objPtr->bytes, "*")))
+                    expand++;
+            }
+            if (token[end].type == JIM_TT_SEP)
+                args++;
+            end++;
+        }
+        interpolation = !((end-start+1) == args*2);
+        /* Add the 'number of arguments' info into cmdstruct.
+         * Negative value if there is list expansion involved. */
+        if (expand)
+            ScriptObjAddInt(script, -1);
+        ScriptObjAddInt(script, args);
+        /* Now add info about the number of tokens. */
+        tokens = 0; /* Number of tokens in current argument. */
+        expand = 0;
+        for (i = start; i <= end; i++) {
+            if (token[i].type == JIM_TT_SEP ||
+                token[i].type == JIM_TT_EOL)
+            {
+                if (tokens == 1 && expand)
+                    expand = 0;
+                ScriptObjAddInt(script,
+                        expand ? -tokens : tokens);
+
+                expand = 0;
+                tokens = 0;
+                continue;
+            } else if (tokens == 0 && token[i].type == JIM_TT_STR &&
+                   (!strcmp(token[i].objPtr->bytes, "expand") ||
+                    !strcmp(token[i].objPtr->bytes, "*")))
+            {
+                expand++;
+            }
+            tokens++;
+        }
+    }
+    /* Perform literal sharing, but only for objects that appear
+     * to be scripts written as literals inside the source code,
+     * and not computed at runtime. Literal sharing is a costly
+     * operation that should be done only against objects that
+     * are likely to require compilation only the first time, and
+     * then are executed multiple times. */
+    if (propagateSourceInfo && interp->framePtr->procBodyObjPtr) {
+        Jim_Obj *bodyObjPtr = interp->framePtr->procBodyObjPtr;
+        if (bodyObjPtr->typePtr == &scriptObjType) {
+            ScriptObj *bodyScript =
+                bodyObjPtr->internalRep.ptr;
+            ScriptShareLiterals(interp, script, bodyScript);
+        }
+    } else if (propagateSourceInfo) {
+        ScriptShareLiterals(interp, script, NULL);
+    }
+    /* Free the old internal rep and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    Jim_SetIntRepPtr(objPtr, script);
+    objPtr->typePtr = &scriptObjType;
+    return JIM_OK;
+}
+
+ScriptObj *Jim_GetScript(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr->typePtr != &scriptObjType) {
+        SetScriptFromAny(interp, objPtr);
+    }
+    return (ScriptObj*) Jim_GetIntRepPtr(objPtr);
+}
+
+/* -----------------------------------------------------------------------------
+ * Commands
+ * ---------------------------------------------------------------------------*/
+
+/* Commands HashTable Type.
+ *
+ * Keys are dynamic allocated strings, Values are Jim_Cmd structures. */
+static void Jim_CommandsHT_ValDestructor(void *interp, void *val)
+{
+    Jim_Cmd *cmdPtr = (void*) val;
+
+    if (cmdPtr->cmdProc == NULL) {
+        Jim_DecrRefCount(interp, cmdPtr->argListObjPtr);
+        Jim_DecrRefCount(interp, cmdPtr->bodyObjPtr);
+        if (cmdPtr->staticVars) {
+            Jim_FreeHashTable(cmdPtr->staticVars);
+            Jim_Free(cmdPtr->staticVars);
+        }
+    } else if (cmdPtr->delProc != NULL) {
+            /* If it was a C coded command, call the delProc if any */
+            cmdPtr->delProc(interp, cmdPtr->privData);
+    }
+    Jim_Free(val);
+}
+
+static Jim_HashTableType JimCommandsHashTableType = {
+    JimStringCopyHTHashFunction,        /* hash function */
+    JimStringCopyHTKeyDup,        /* key dup */
+    NULL,                    /* val dup */
+    JimStringCopyHTKeyCompare,        /* key compare */
+    JimStringCopyHTKeyDestructor,        /* key destructor */
+    Jim_CommandsHT_ValDestructor        /* val destructor */
+};
+
+/* ------------------------- Commands related functions --------------------- */
+
+int Jim_CreateCommand(Jim_Interp *interp, const char *cmdName,
+        Jim_CmdProc cmdProc, void *privData, Jim_DelCmdProc delProc)
+{
+    Jim_HashEntry *he;
+    Jim_Cmd *cmdPtr;
+
+    he = Jim_FindHashEntry(&interp->commands, cmdName);
+    if (he == NULL) { /* New command to create */
+        cmdPtr = Jim_Alloc(sizeof(*cmdPtr));
+        cmdPtr->cmdProc = cmdProc;
+        cmdPtr->privData = privData;
+        cmdPtr->delProc = delProc;
+        Jim_AddHashEntry(&interp->commands, cmdName, cmdPtr);
+    } else {
+        Jim_InterpIncrProcEpoch(interp);
+        /* Free the arglist/body objects if it was a Tcl procedure */
+        cmdPtr = he->val;
+        if (cmdPtr->cmdProc == NULL) {
+            Jim_DecrRefCount(interp, cmdPtr->argListObjPtr);
+            Jim_DecrRefCount(interp, cmdPtr->bodyObjPtr);
+            if (cmdPtr->staticVars) {
+                Jim_FreeHashTable(cmdPtr->staticVars);
+                Jim_Free(cmdPtr->staticVars);
+            }
+            cmdPtr->staticVars = NULL;
+        } else if (cmdPtr->delProc != NULL) {
+            /* If it was a C coded command, call the delProc if any */
+            cmdPtr->delProc(interp, cmdPtr->privData);
+        }
+        cmdPtr->cmdProc = cmdProc;
+        cmdPtr->privData = privData;
+    }
+    /* There is no need to increment the 'proc epoch' because
+     * creation of a new procedure can never affect existing
+     * cached commands. We don't do negative caching. */
+    return JIM_OK;
+}
+
+int Jim_CreateProcedure(Jim_Interp *interp, const char *cmdName,
+        Jim_Obj *argListObjPtr, Jim_Obj *staticsListObjPtr, Jim_Obj *bodyObjPtr,
+        int arityMin, int arityMax)
+{
+    Jim_Cmd *cmdPtr;
+
+    cmdPtr = Jim_Alloc(sizeof(*cmdPtr));
+    cmdPtr->cmdProc = NULL; /* Not a C coded command */
+    cmdPtr->argListObjPtr = argListObjPtr;
+    cmdPtr->bodyObjPtr = bodyObjPtr;
+    Jim_IncrRefCount(argListObjPtr);
+    Jim_IncrRefCount(bodyObjPtr);
+    cmdPtr->arityMin = arityMin;
+    cmdPtr->arityMax = arityMax;
+    cmdPtr->staticVars = NULL;
+   
+    /* Create the statics hash table. */
+    if (staticsListObjPtr) {
+        int len, i;
+
+        Jim_ListLength(interp, staticsListObjPtr, &len);
+        if (len != 0) {
+            cmdPtr->staticVars = Jim_Alloc(sizeof(Jim_HashTable));
+            Jim_InitHashTable(cmdPtr->staticVars, &JimVariablesHashTableType,
+                    interp);
+            for (i = 0; i < len; i++) {
+                Jim_Obj *objPtr, *initObjPtr, *nameObjPtr;
+                Jim_Var *varPtr;
+                int subLen;
+
+                Jim_ListIndex(interp, staticsListObjPtr, i, &objPtr, JIM_NONE);
+                /* Check if it's composed of two elements. */
+                Jim_ListLength(interp, objPtr, &subLen);
+                if (subLen == 1 || subLen == 2) {
+                    /* Try to get the variable value from the current
+                     * environment. */
+                    Jim_ListIndex(interp, objPtr, 0, &nameObjPtr, JIM_NONE);
+                    if (subLen == 1) {
+                        initObjPtr = Jim_GetVariable(interp, nameObjPtr,
+                                JIM_NONE);
+                        if (initObjPtr == NULL) {
+                            Jim_SetResult(interp,
+                                    Jim_NewEmptyStringObj(interp));
+                            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                                "variable for initialization of static \"",
+                                Jim_GetString(nameObjPtr, NULL),
+                                "\" not found in the local context",
+                                NULL);
+                            goto err;
+                        }
+                    } else {
+                        Jim_ListIndex(interp, objPtr, 1, &initObjPtr, JIM_NONE);
+                    }
+                    varPtr = Jim_Alloc(sizeof(*varPtr));
+                    varPtr->objPtr = initObjPtr;
+                    Jim_IncrRefCount(initObjPtr);
+                    varPtr->linkFramePtr = NULL;
+                    if (Jim_AddHashEntry(cmdPtr->staticVars,
+                            Jim_GetString(nameObjPtr, NULL),
+                            varPtr) != JIM_OK)
+                    {
+                        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+                        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                            "static variable name \"",
+                            Jim_GetString(objPtr, NULL), "\"",
+                            " duplicated in statics list", NULL);
+                        Jim_DecrRefCount(interp, initObjPtr);
+                        Jim_Free(varPtr);
+                        goto err;
+                    }
+                } else {
+                    Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+                    Jim_AppendStrings(interp, Jim_GetResult(interp),
+                        "too many fields in static specifier \"",
+                        objPtr, "\"", NULL);
+                    goto err;
+                }
+            }
+        }
+    }
+
+    /* Add the new command */
+
+    /* it may already exist, so we try to delete the old one */
+    if (Jim_DeleteHashEntry(&interp->commands, cmdName) != JIM_ERR) {
+        /* There was an old procedure with the same name, this requires
+         * a 'proc epoch' update. */
+        Jim_InterpIncrProcEpoch(interp);
+    }
+    /* If a procedure with the same name didn't existed there is no need
+     * to increment the 'proc epoch' because creation of a new procedure
+     * can never affect existing cached commands. We don't do
+     * negative caching. */
+    Jim_AddHashEntry(&interp->commands, cmdName, cmdPtr);
+    return JIM_OK;
+
+err:
+    Jim_FreeHashTable(cmdPtr->staticVars);
+    Jim_Free(cmdPtr->staticVars);
+    Jim_DecrRefCount(interp, argListObjPtr);
+    Jim_DecrRefCount(interp, bodyObjPtr);
+    Jim_Free(cmdPtr);
+    return JIM_ERR;
+}
+
+int Jim_DeleteCommand(Jim_Interp *interp, const char *cmdName)
+{
+    if (Jim_DeleteHashEntry(&interp->commands, cmdName) == JIM_ERR)
+        return JIM_ERR;
+    Jim_InterpIncrProcEpoch(interp);
+    return JIM_OK;
+}
+
+int Jim_RenameCommand(Jim_Interp *interp, const char *oldName, 
+        const char *newName)
+{
+    Jim_Cmd *cmdPtr;
+    Jim_HashEntry *he;
+    Jim_Cmd *copyCmdPtr;
+
+    if (newName[0] == '\0') /* Delete! */
+        return Jim_DeleteCommand(interp, oldName);
+    /* Rename */
+    he = Jim_FindHashEntry(&interp->commands, oldName);
+    if (he == NULL)
+        return JIM_ERR; /* Invalid command name */
+    cmdPtr = he->val;
+    copyCmdPtr = Jim_Alloc(sizeof(Jim_Cmd));
+    *copyCmdPtr = *cmdPtr;
+    /* In order to avoid that a procedure will get arglist/body/statics
+     * freed by the hash table methods, fake a C-coded command
+     * setting cmdPtr->cmdProc as not NULL */
+    cmdPtr->cmdProc = (void*)1;
+    /* Also make sure delProc is NULL. */
+    cmdPtr->delProc = NULL;
+    /* Destroy the old command, and make sure the new is freed
+     * as well. */
+    Jim_DeleteHashEntry(&interp->commands, oldName);
+    Jim_DeleteHashEntry(&interp->commands, newName);
+    /* Now the new command. We are sure it can't fail because
+     * the target name was already freed. */
+    Jim_AddHashEntry(&interp->commands, newName, copyCmdPtr);
+    /* Increment the epoch */
+    Jim_InterpIncrProcEpoch(interp);
+    return JIM_OK;
+}
+
+/* -----------------------------------------------------------------------------
+ * Command object
+ * ---------------------------------------------------------------------------*/
+
+static int SetCommandFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static Jim_ObjType commandObjType = {
+    "command",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+int SetCommandFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_HashEntry *he;
+    const char *cmdName;
+
+    /* Get the string representation */
+    cmdName = Jim_GetString(objPtr, NULL);
+    /* Lookup this name into the commands hash table */
+    he = Jim_FindHashEntry(&interp->commands, cmdName);
+    if (he == NULL)
+        return JIM_ERR;
+
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &commandObjType;
+    objPtr->internalRep.cmdValue.procEpoch = interp->procEpoch;
+    objPtr->internalRep.cmdValue.cmdPtr = (void*)he->val;
+    return JIM_OK;
+}
+
+/* This function returns the command structure for the command name
+ * stored in objPtr. It tries to specialize the objPtr to contain
+ * a cached info instead to perform the lookup into the hash table
+ * every time. The information cached may not be uptodate, in such
+ * a case the lookup is performed and the cache updated. */
+Jim_Cmd *Jim_GetCommand(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    if ((objPtr->typePtr != &commandObjType ||
+        objPtr->internalRep.cmdValue.procEpoch != interp->procEpoch) &&
+        SetCommandFromAny(interp, objPtr) == JIM_ERR) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "invalid command name \"", objPtr->bytes, "\"",
+                NULL);
+        }
+        return NULL;
+    }
+    return objPtr->internalRep.cmdValue.cmdPtr;
+}
+
+/* -----------------------------------------------------------------------------
+ * Variables
+ * ---------------------------------------------------------------------------*/
+
+/* Variables HashTable Type.
+ *
+ * Keys are dynamic allocated strings, Values are Jim_Var structures. */
+static void JimVariablesHTValDestructor(void *interp, void *val)
+{
+    Jim_Var *varPtr = (void*) val;
+
+    Jim_DecrRefCount(interp, varPtr->objPtr);
+    Jim_Free(val);
+}
+
+static Jim_HashTableType JimVariablesHashTableType = {
+    JimStringCopyHTHashFunction,        /* hash function */
+    JimStringCopyHTKeyDup,              /* key dup */
+    NULL,                               /* val dup */
+    JimStringCopyHTKeyCompare,        /* key compare */
+    JimStringCopyHTKeyDestructor,     /* key destructor */
+    JimVariablesHTValDestructor       /* val destructor */
+};
+
+/* -----------------------------------------------------------------------------
+ * Variable object
+ * ---------------------------------------------------------------------------*/
+
+#define JIM_DICT_SUGAR 100 /* Only returned by SetVariableFromAny() */
+
+static int SetVariableFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static Jim_ObjType variableObjType = {
+    "variable",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+/* Return true if the string "str" looks like syntax sugar for [dict]. I.e.
+ * is in the form "varname(key)". */
+static int Jim_NameIsDictSugar(const char *str, int len)
+{
+    if (len == -1)
+        len = strlen(str);
+    if (len && str[len-1] == ')' && strchr(str, '(') != NULL)
+        return 1;
+    return 0;
+}
+
+/* This method should be called only by the variable API.
+ * It returns JIM_OK on success (variable already exists),
+ * JIM_ERR if it does not exists, JIM_DICT_GLUE if it's not
+ * a variable name, but syntax glue for [dict] i.e. the last
+ * character is ')' */
+int SetVariableFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    Jim_HashEntry *he;
+    const char *varName;
+    int len;
+
+    /* Check if the object is already an uptodate variable */
+    if (objPtr->typePtr == &variableObjType &&
+        objPtr->internalRep.varValue.callFrameId == interp->framePtr->id)
+        return JIM_OK; /* nothing to do */
+    /* Get the string representation */
+    varName = Jim_GetString(objPtr, &len);
+    /* Make sure it's not syntax glue to get/set dict. */
+    if (Jim_NameIsDictSugar(varName, len))
+            return JIM_DICT_SUGAR;
+    /* Lookup this name into the variables hash table */
+    he = Jim_FindHashEntry(&interp->framePtr->vars, varName);
+    if (he == NULL) {
+        /* Try with static vars. */
+        if (interp->framePtr->staticVars == NULL)
+            return JIM_ERR;
+        if (!(he = Jim_FindHashEntry(interp->framePtr->staticVars, varName)))
+            return JIM_ERR;
+    }
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &variableObjType;
+    objPtr->internalRep.varValue.callFrameId = interp->framePtr->id;
+    objPtr->internalRep.varValue.varPtr = (void*)he->val;
+    return JIM_OK;
+}
+
+/* -------------------- Variables related functions ------------------------- */
+static int JimDictSugarSet(Jim_Interp *interp, Jim_Obj *ObjPtr,
+        Jim_Obj *valObjPtr);
+static Jim_Obj *JimDictSugarGet(Jim_Interp *interp, Jim_Obj *ObjPtr);
+
+/* For now that's dummy. Variables lookup should be optimized
+ * in many ways, with caching of lookups, and possibly with
+ * a table of pre-allocated vars in every CallFrame for local vars.
+ * All the caching should also have an 'epoch' mechanism similar
+ * to the one used by Tcl for procedures lookup caching. */
+
+int Jim_SetVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, Jim_Obj *valObjPtr)
+{
+    const char *name;
+    Jim_Var *var;
+    int err;
+
+    if ((err = SetVariableFromAny(interp, nameObjPtr)) != JIM_OK) {
+        /* Check for [dict] syntax sugar. */
+        if (err == JIM_DICT_SUGAR)
+            return JimDictSugarSet(interp, nameObjPtr, valObjPtr);
+        /* New variable to create */
+        name = Jim_GetString(nameObjPtr, NULL);
+
+        var = Jim_Alloc(sizeof(*var));
+        var->objPtr = valObjPtr;
+        Jim_IncrRefCount(valObjPtr);
+        var->linkFramePtr = NULL;
+        /* Insert the new variable */
+        Jim_AddHashEntry(&interp->framePtr->vars, name, var);
+        /* Make the object int rep a variable */
+        Jim_FreeIntRep(interp, nameObjPtr);
+        nameObjPtr->typePtr = &variableObjType;
+        nameObjPtr->internalRep.varValue.callFrameId =
+            interp->framePtr->id;
+        nameObjPtr->internalRep.varValue.varPtr = var;
+    } else {
+        var = nameObjPtr->internalRep.varValue.varPtr;
+        if (var->linkFramePtr == NULL) {
+            Jim_IncrRefCount(valObjPtr);
+            Jim_DecrRefCount(interp, var->objPtr);
+            var->objPtr = valObjPtr;
+        } else { /* Else handle the link */
+            Jim_CallFrame *savedCallFrame;
+
+            savedCallFrame = interp->framePtr;
+            interp->framePtr = var->linkFramePtr;
+            err = Jim_SetVariable(interp, var->objPtr, valObjPtr);
+            interp->framePtr = savedCallFrame;
+            if (err != JIM_OK)
+                return err;
+        }
+    }
+    return JIM_OK;
+}
+
+int Jim_SetVariableStr(Jim_Interp *interp, const char *name, Jim_Obj *objPtr)
+{
+    Jim_Obj *nameObjPtr;
+    int result;
+
+    nameObjPtr = Jim_NewStringObj(interp, name, -1);
+    Jim_IncrRefCount(nameObjPtr);
+    result = Jim_SetVariable(interp, nameObjPtr, objPtr);
+    Jim_DecrRefCount(interp, nameObjPtr);
+    return result;
+}
+
+int Jim_SetGlobalVariableStr(Jim_Interp *interp, const char *name, Jim_Obj *objPtr)
+{
+    Jim_CallFrame *savedFramePtr;
+    int result;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    result = Jim_SetVariableStr(interp, name, objPtr);
+    interp->framePtr = savedFramePtr;
+    return result;
+}
+
+int Jim_SetVariableStrWithStr(Jim_Interp *interp, const char *name, const char *val)
+{
+    Jim_Obj *nameObjPtr, *valObjPtr;
+    int result;
+
+    nameObjPtr = Jim_NewStringObj(interp, name, -1);
+    valObjPtr = Jim_NewStringObj(interp, val, -1);
+    Jim_IncrRefCount(nameObjPtr);
+    Jim_IncrRefCount(valObjPtr);
+    result = Jim_SetVariable(interp, nameObjPtr, valObjPtr);
+    Jim_DecrRefCount(interp, nameObjPtr);
+    Jim_DecrRefCount(interp, valObjPtr);
+    return result;
+}
+
+int Jim_SetVariableLink(Jim_Interp *interp, Jim_Obj *nameObjPtr,
+        Jim_Obj *targetNameObjPtr, Jim_CallFrame *targetCallFrame)
+{
+    const char *varName;
+    int len;
+
+    /* Check for cycles. */
+    if (interp->framePtr == targetCallFrame) {
+        Jim_Obj *objPtr = targetNameObjPtr;
+        Jim_Var *varPtr;
+        /* Cycles are only possible with 'uplevel 0' */
+        while(1) {
+            if (Jim_StringEqObj(objPtr, nameObjPtr, 0)) {
+                Jim_SetResultString(interp,
+                    "can't upvar from variable to itself", -1);
+                return JIM_ERR;
+            }
+            if (SetVariableFromAny(interp, objPtr) != JIM_OK)
+                break;
+            varPtr = objPtr->internalRep.varValue.varPtr;
+            if (varPtr->linkFramePtr != targetCallFrame) break;
+            objPtr = varPtr->objPtr;
+        }
+    }
+    varName = Jim_GetString(nameObjPtr, &len);
+    if (Jim_NameIsDictSugar(varName, len)) {
+        Jim_SetResultString(interp,
+            "Dict key syntax invalid as link source", -1);
+        return JIM_ERR;
+    }
+    /* Perform the binding */
+    Jim_SetVariable(interp, nameObjPtr, targetNameObjPtr);
+    /* We are now sure 'nameObjPtr' type is variableObjType */
+    nameObjPtr->internalRep.varValue.varPtr->linkFramePtr = targetCallFrame;
+    return JIM_OK;
+}
+
+/* Return the Jim_Obj pointer associated with a variable name,
+ * or NULL if the variable was not found in the current context.
+ * The same optimization discussed in the comment to the
+ * 'SetVariable' function should apply here. */
+Jim_Obj *Jim_GetVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, int flags)
+{
+    int err;
+
+    /* All the rest is handled here */
+    if ((err = SetVariableFromAny(interp, nameObjPtr)) != JIM_OK) {
+        /* Check for [dict] syntax sugar. */
+        if (err == JIM_DICT_SUGAR)
+            return JimDictSugarGet(interp, nameObjPtr);
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "can't read \"", nameObjPtr->bytes,
+                "\": no such variable", NULL);
+        }
+        return NULL;
+    } else {
+        Jim_Var *varPtr;
+        Jim_Obj *objPtr;
+        Jim_CallFrame *savedCallFrame;
+
+        varPtr = nameObjPtr->internalRep.varValue.varPtr;
+        if (varPtr->linkFramePtr == NULL)
+            return varPtr->objPtr;
+        /* The variable is a link? Resolve it. */
+        savedCallFrame = interp->framePtr;
+        interp->framePtr = varPtr->linkFramePtr;
+        objPtr = Jim_GetVariable(interp, varPtr->objPtr, JIM_NONE);
+        if (objPtr == NULL && flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "can't read \"", nameObjPtr->bytes,
+                "\": no such variable", NULL);
+        }
+        interp->framePtr = savedCallFrame;
+        return objPtr;
+    }
+}
+
+Jim_Obj *Jim_GetGlobalVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr,
+        int flags)
+{
+    Jim_CallFrame *savedFramePtr;
+    Jim_Obj *objPtr;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    objPtr = Jim_GetVariable(interp, nameObjPtr, flags);
+    interp->framePtr = savedFramePtr;
+
+    return objPtr;
+}
+
+Jim_Obj *Jim_GetVariableStr(Jim_Interp *interp, const char *name, int flags)
+{
+    Jim_Obj *nameObjPtr, *varObjPtr;
+
+    nameObjPtr = Jim_NewStringObj(interp, name, -1);
+    Jim_IncrRefCount(nameObjPtr);
+    varObjPtr = Jim_GetVariable(interp, nameObjPtr, flags);
+    Jim_DecrRefCount(interp, nameObjPtr);
+    return varObjPtr;
+}
+
+Jim_Obj *Jim_GetGlobalVariableStr(Jim_Interp *interp, const char *name,
+        int flags)
+{
+    Jim_CallFrame *savedFramePtr;
+    Jim_Obj *objPtr;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    objPtr = Jim_GetVariableStr(interp, name, flags);
+    interp->framePtr = savedFramePtr;
+
+    return objPtr;
+}
+
+/* Unset a variable.
+ * Note: On success unset invalidates all the variable objects created
+ * in the current call frame incrementing. */
+int Jim_UnsetVariable(Jim_Interp *interp, Jim_Obj *nameObjPtr, int flags)
+{
+    const char *name;
+    Jim_Var *varPtr;
+    int err;
+    
+    if ((err = SetVariableFromAny(interp, nameObjPtr)) != JIM_OK) {
+        /* Check for [dict] syntax sugar. */
+        if (err == JIM_DICT_SUGAR)
+            return JimDictSugarSet(interp, nameObjPtr, NULL);
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "can't unset \"", nameObjPtr->bytes,
+            "\": no such variable", NULL);
+        return JIM_ERR; /* var not found */
+    }
+    varPtr = nameObjPtr->internalRep.varValue.varPtr;
+    /* If it's a link call UnsetVariable recursively */
+    if (varPtr->linkFramePtr) {
+        int retval;
+
+        Jim_CallFrame *savedCallFrame;
+
+        savedCallFrame = interp->framePtr;
+        interp->framePtr = varPtr->linkFramePtr;
+        retval = Jim_UnsetVariable(interp, varPtr->objPtr, JIM_NONE);
+        interp->framePtr = savedCallFrame;
+        if (retval != JIM_OK && flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "can't unset \"", nameObjPtr->bytes,
+                "\": no such variable", NULL);
+        }
+        return retval;
+    } else {
+        name = Jim_GetString(nameObjPtr, NULL);
+        if (Jim_DeleteHashEntry(&interp->framePtr->vars, name)
+                != JIM_OK) return JIM_ERR;
+        /* Change the callframe id, invalidating var lookup caching */
+        JimChangeCallFrameId(interp, interp->framePtr);
+        return JIM_OK;
+    }
+}
+
+/* ----------  Dict syntax sugar (similar to array Tcl syntax) -------------- */
+
+/* Given a variable name for [dict] operation syntax sugar,
+ * this function returns two objects, the first with the name
+ * of the variable to set, and the second with the rispective key.
+ * For example "foo(bar)" will return objects with string repr. of
+ * "foo" and "bar".
+ *
+ * The returned objects have refcount = 1. The function can't fail. */
+static void JimDictSugarParseVarKey(Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj **varPtrPtr, Jim_Obj **keyPtrPtr)
+{
+    const char *str, *p;
+    char *t;
+    int len, keyLen, nameLen;
+    Jim_Obj *varObjPtr, *keyObjPtr;
+
+    str = Jim_GetString(objPtr, &len);
+    p = strchr(str, '(');
+    p++;
+    keyLen = len-((p-str)+1);
+    nameLen = (p-str)-1;
+    /* Create the objects with the variable name and key. */
+    t = Jim_Alloc(nameLen+1);
+    memcpy(t, str, nameLen);
+    t[nameLen] = '\0';
+    varObjPtr = Jim_NewStringObjNoAlloc(interp, t, nameLen);
+
+    t = Jim_Alloc(keyLen+1);
+    memcpy(t, p, keyLen);
+    t[keyLen] = '\0';
+    keyObjPtr = Jim_NewStringObjNoAlloc(interp, t, keyLen);
+
+    Jim_IncrRefCount(varObjPtr);
+    Jim_IncrRefCount(keyObjPtr);
+    *varPtrPtr = varObjPtr;
+    *keyPtrPtr = keyObjPtr;
+}
+
+/* Helper of Jim_SetVariable() to deal with dict-syntax variable names.
+ * Also used by Jim_UnsetVariable() with valObjPtr = NULL. */
+static int JimDictSugarSet(Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *valObjPtr)
+{
+    Jim_Obj *varObjPtr, *keyObjPtr;
+    int err = JIM_OK;
+
+    JimDictSugarParseVarKey(interp, objPtr, &varObjPtr, &keyObjPtr);
+    err = Jim_SetDictKeysVector(interp, varObjPtr, &keyObjPtr, 1,
+            valObjPtr);
+    Jim_DecrRefCount(interp, varObjPtr);
+    Jim_DecrRefCount(interp, keyObjPtr);
+    return err;
+}
+
+/* Helper of Jim_GetVariable() to deal with dict-syntax variable names */
+static Jim_Obj *JimDictSugarGet(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_Obj *varObjPtr, *keyObjPtr, *dictObjPtr, *resObjPtr;
+
+    JimDictSugarParseVarKey(interp, objPtr, &varObjPtr, &keyObjPtr);
+    dictObjPtr = Jim_GetVariable(interp, varObjPtr, JIM_ERRMSG);
+    if (!dictObjPtr) {
+        resObjPtr = NULL;
+        goto err;
+    }
+    if (Jim_DictKey(interp, dictObjPtr, keyObjPtr, &resObjPtr, JIM_ERRMSG)
+            != JIM_OK) {
+        resObjPtr = NULL;
+    }
+err:
+    Jim_DecrRefCount(interp, varObjPtr);
+    Jim_DecrRefCount(interp, keyObjPtr);
+    return resObjPtr;
+}
+
+/* --------- $var(INDEX) substitution, using a specialized object ----------- */
+
+static void FreeDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr,
+        Jim_Obj *dupPtr);
+
+static Jim_ObjType dictSubstObjType = {
+    "dict-substitution",
+    FreeDictSubstInternalRep,
+    DupDictSubstInternalRep,
+    NULL,
+    JIM_TYPE_NONE,
+};
+
+void FreeDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_DecrRefCount(interp, objPtr->internalRep.dictSubstValue.varNameObjPtr);
+    Jim_DecrRefCount(interp, objPtr->internalRep.dictSubstValue.indexObjPtr);
+}
+
+void DupDictSubstInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr,
+        Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+
+    dupPtr->internalRep.dictSubstValue.varNameObjPtr =
+        srcPtr->internalRep.dictSubstValue.varNameObjPtr;
+    dupPtr->internalRep.dictSubstValue.indexObjPtr =
+        srcPtr->internalRep.dictSubstValue.indexObjPtr;
+    dupPtr->typePtr = &dictSubstObjType;
+}
+
+/* This function is used to expand [dict get] sugar in the form
+ * of $var(INDEX). The function is mainly used by Jim_EvalObj()
+ * to deal with tokens of type JIM_TT_DICTSUGAR. objPtr points to an
+ * object that is *guaranteed* to be in the form VARNAME(INDEX).
+ * The 'index' part is [subst]ituted, and is used to lookup a key inside
+ * the [dict]ionary contained in variable VARNAME. */
+Jim_Obj *Jim_ExpandDictSugar(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    Jim_Obj *varObjPtr, *keyObjPtr, *dictObjPtr, *resObjPtr;
+    Jim_Obj *substKeyObjPtr = NULL;
+
+    if (objPtr->typePtr != &dictSubstObjType) {
+        JimDictSugarParseVarKey(interp, objPtr, &varObjPtr, &keyObjPtr);
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &dictSubstObjType;
+        objPtr->internalRep.dictSubstValue.varNameObjPtr = varObjPtr;
+        objPtr->internalRep.dictSubstValue.indexObjPtr = keyObjPtr;
+    }
+    if (Jim_SubstObj(interp, objPtr->internalRep.dictSubstValue.indexObjPtr,
+                &substKeyObjPtr, JIM_NONE)
+            != JIM_OK) {
+        substKeyObjPtr = NULL;
+        goto err;
+    }
+    Jim_IncrRefCount(substKeyObjPtr);
+    dictObjPtr = Jim_GetVariable(interp,
+            objPtr->internalRep.dictSubstValue.varNameObjPtr, JIM_ERRMSG);
+    if (!dictObjPtr) {
+        resObjPtr = NULL;
+        goto err;
+    }
+    if (Jim_DictKey(interp, dictObjPtr, substKeyObjPtr, &resObjPtr, JIM_ERRMSG)
+            != JIM_OK) {
+        resObjPtr = NULL;
+        goto err;
+    }
+err:
+    if (substKeyObjPtr) Jim_DecrRefCount(interp, substKeyObjPtr);
+    return resObjPtr;
+}
+
+/* -----------------------------------------------------------------------------
+ * CallFrame
+ * ---------------------------------------------------------------------------*/
+
+static Jim_CallFrame *JimCreateCallFrame(Jim_Interp *interp)
+{
+    Jim_CallFrame *cf;
+    if (interp->freeFramesList) {
+        cf = interp->freeFramesList;
+        interp->freeFramesList = cf->nextFramePtr;
+    } else {
+        cf = Jim_Alloc(sizeof(*cf));
+        cf->vars.table = NULL;
+    }
+
+    cf->id = interp->callFrameEpoch++;
+    cf->parentCallFrame = NULL;
+    cf->argv = NULL;
+    cf->argc = 0;
+    cf->procArgsObjPtr = NULL;
+    cf->procBodyObjPtr = NULL;
+    cf->nextFramePtr = NULL;
+    cf->staticVars = NULL;
+    if (cf->vars.table == NULL)
+        Jim_InitHashTable(&cf->vars, &JimVariablesHashTableType, interp);
+    return cf;
+}
+
+/* Used to invalidate every caching related to callframe stability. */
+static void JimChangeCallFrameId(Jim_Interp *interp, Jim_CallFrame *cf)
+{
+    cf->id = interp->callFrameEpoch++;
+}
+
+#define JIM_FCF_NONE 0 /* no flags */
+#define JIM_FCF_NOHT 1 /* don't free the hash table */
+static void JimFreeCallFrame(Jim_Interp *interp, Jim_CallFrame *cf,
+        int flags)
+{
+    if (cf->procArgsObjPtr) Jim_DecrRefCount(interp, cf->procArgsObjPtr);
+    if (cf->procBodyObjPtr) Jim_DecrRefCount(interp, cf->procBodyObjPtr);
+    if (!(flags & JIM_FCF_NOHT))
+        Jim_FreeHashTable(&cf->vars);
+    else {
+        int i;
+        Jim_HashEntry **table = cf->vars.table, *he;
+
+        for (i = 0; i < JIM_HT_INITIAL_SIZE; i++) {
+            he = table[i];
+            while (he != NULL) {
+                Jim_HashEntry *nextEntry = he->next;
+                Jim_Var *varPtr = (void*) he->val;
+
+                Jim_DecrRefCount(interp, varPtr->objPtr);
+                Jim_Free(he->val);
+                Jim_Free((void*)he->key); /* ATTENTION: const cast */
+                Jim_Free(he);
+                table[i] = NULL;
+                he = nextEntry;
+            }
+        }
+        cf->vars.used = 0;
+    }
+    cf->nextFramePtr = interp->freeFramesList;
+    interp->freeFramesList = cf;
+}
+
+/* -----------------------------------------------------------------------------
+ * References
+ * ---------------------------------------------------------------------------*/
+
+/* References HashTable Type.
+ *
+ * Keys are jim_wide integers, dynamically allocated for now but in the
+ * future it's worth to cache this 8 bytes objects. Values are poitners
+ * to Jim_References. */
+static void JimReferencesHTValDestructor(void *interp, void *val)
+{
+    Jim_Reference *refPtr = (void*) val;
+
+    Jim_DecrRefCount(interp, refPtr->objPtr);
+    if (refPtr->finalizerCmdNamePtr != NULL) {
+        Jim_DecrRefCount(interp, refPtr->finalizerCmdNamePtr);
+    }
+    Jim_Free(val);
+}
+
+unsigned int JimReferencesHTHashFunction(const void *key)
+{
+    /* Only the least significant bits are used. */
+    const jim_wide *widePtr = key;
+    unsigned int intValue = (unsigned int) *widePtr;
+    return Jim_IntHashFunction(intValue);
+}
+
+unsigned int JimReferencesHTDoubleHashFunction(const void *key)
+{
+    /* Only the least significant bits are used. */
+    const jim_wide *widePtr = key;
+    unsigned int intValue = (unsigned int) *widePtr;
+    return intValue; /* identity function. */
+}
+
+const void *JimReferencesHTKeyDup(void *privdata, const void *key)
+{
+    void *copy = Jim_Alloc(sizeof(jim_wide));
+    JIM_NOTUSED(privdata);
+
+    memcpy(copy, key, sizeof(jim_wide));
+    return copy;
+}
+
+int JimReferencesHTKeyCompare(void *privdata, const void *key1, 
+        const void *key2)
+{
+    JIM_NOTUSED(privdata);
+
+    return memcmp(key1, key2, sizeof(jim_wide)) == 0;
+}
+
+void JimReferencesHTKeyDestructor(void *privdata, const void *key)
+{
+    JIM_NOTUSED(privdata);
+
+    Jim_Free((void*)key);
+}
+
+static Jim_HashTableType JimReferencesHashTableType = {
+    JimReferencesHTHashFunction,    /* hash function */
+    JimReferencesHTKeyDup,          /* key dup */
+    NULL,                           /* val dup */
+    JimReferencesHTKeyCompare,      /* key compare */
+    JimReferencesHTKeyDestructor,   /* key destructor */
+    JimReferencesHTValDestructor    /* val destructor */
+};
+
+/* -----------------------------------------------------------------------------
+ * Reference object type and References API
+ * ---------------------------------------------------------------------------*/
+
+static void UpdateStringOfReference(struct Jim_Obj *objPtr);
+
+static Jim_ObjType referenceObjType = {
+    "reference",
+    NULL,
+    NULL,
+    UpdateStringOfReference,
+    JIM_TYPE_REFERENCES,
+};
+
+void UpdateStringOfReference(struct Jim_Obj *objPtr)
+{
+    int len;
+    char buf[JIM_REFERENCE_SPACE+1];
+    Jim_Reference *refPtr;
+
+    refPtr = objPtr->internalRep.refValue.refPtr;
+    len = JimFormatReference(buf, refPtr, objPtr->internalRep.refValue.id);
+    objPtr->bytes = Jim_Alloc(len+1);
+    memcpy(objPtr->bytes, buf, len+1);
+    objPtr->length = len;
+}
+
+/* returns true if 'c' is a valid reference tag character.
+ * i.e. inside the range [_a-zA-Z0-9] */
+static int isrefchar(int c)
+{
+    if (c == '_' || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
+        (c >= '0' && c <= '9')) return 1;
+    return 0;
+}
+
+int SetReferenceFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    jim_wide wideValue;
+    int i, len;
+    const char *str, *start, *end;
+    char refId[21];
+    Jim_Reference *refPtr;
+    Jim_HashEntry *he;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, &len);
+    /* Check if it looks like a reference */
+    if (len < JIM_REFERENCE_SPACE) goto badformat;
+    /* Trim spaces */
+    start = str;
+    end = str+len-1;
+    while (*start == ' ') start++;
+    while (*end == ' ' && end > start) end--;
+    if (end-start+1 != JIM_REFERENCE_SPACE) goto badformat;
+    /* <reference.<1234567>.%020> */
+    if (memcmp(start, "<reference.<", 12) != 0) goto badformat;
+    if (start[12+JIM_REFERENCE_TAGLEN] != '>' || end[0] != '>') goto badformat;
+    /* The tag can't contain chars other than a-zA-Z0-9 + '_'. */
+    for (i = 0; i < JIM_REFERENCE_TAGLEN; i++) {
+        if (!isrefchar(start[12+i])) goto badformat;
+    }
+    /* Extract info from the refernece. */
+    memcpy(refId, start+14+JIM_REFERENCE_TAGLEN, 20);
+    refId[20] = '\0';
+    /* Try to convert the ID into a jim_wide */
+    if (Jim_StringToWide(refId, &wideValue, 10) != JIM_OK) goto badformat;
+    /* Check if the reference really exists! */
+    he = Jim_FindHashEntry(&interp->references, &wideValue);
+    if (he == NULL) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "Invalid reference ID \"", str, "\"", NULL);
+        return JIM_ERR;
+    }
+    refPtr = he->val;
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &referenceObjType;
+    objPtr->internalRep.refValue.id = wideValue;
+    objPtr->internalRep.refValue.refPtr = refPtr;
+    return JIM_OK;
+
+badformat:
+    Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+    Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "expected reference but got \"", str, "\"", NULL);
+    return JIM_ERR;
+}
+
+/* Returns a new reference pointing to objPtr, having cmdNamePtr
+ * as finalizer command (or NULL if there is no finalizer).
+ * The returned reference object has refcount = 0. */
+Jim_Obj *Jim_NewReference(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *tagPtr,
+        Jim_Obj *cmdNamePtr)
+{
+    struct Jim_Reference *refPtr;
+    jim_wide wideValue = interp->referenceNextId;
+    Jim_Obj *refObjPtr;
+    const char *tag;
+    int tagLen, i;
+
+    /* Perform the Garbage Collection if needed. */
+    Jim_CollectIfNeeded(interp);
+
+    refPtr = Jim_Alloc(sizeof(*refPtr));
+    refPtr->objPtr = objPtr;
+    Jim_IncrRefCount(objPtr);
+    refPtr->finalizerCmdNamePtr = cmdNamePtr;
+    if (cmdNamePtr)
+        Jim_IncrRefCount(cmdNamePtr);
+    Jim_AddHashEntry(&interp->references, &wideValue, refPtr);
+    refObjPtr = Jim_NewObj(interp);
+    refObjPtr->typePtr = &referenceObjType;
+    refObjPtr->bytes = NULL;
+    refObjPtr->internalRep.refValue.id = interp->referenceNextId;
+    refObjPtr->internalRep.refValue.refPtr = refPtr;
+    interp->referenceNextId++;
+    /* Set the tag. Trimmered at JIM_REFERENCE_TAGLEN. Everything
+     * that does not pass the 'isrefchar' test is replaced with '_' */
+    tag = Jim_GetString(tagPtr, &tagLen);
+    if (tagLen > JIM_REFERENCE_TAGLEN)
+        tagLen = JIM_REFERENCE_TAGLEN;
+    for (i = 0; i < JIM_REFERENCE_TAGLEN; i++) {
+        if (i < tagLen)
+            refPtr->tag[i] = tag[i];
+        else
+            refPtr->tag[i] = '_';
+    }
+    refPtr->tag[JIM_REFERENCE_TAGLEN] = '\0';
+    return refObjPtr;
+}
+
+Jim_Reference *Jim_GetReference(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr->typePtr != &referenceObjType &&
+        SetReferenceFromAny(interp, objPtr) == JIM_ERR)
+        return NULL;
+    return objPtr->internalRep.refValue.refPtr;
+}
+
+int Jim_SetFinalizer(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *cmdNamePtr)
+{
+    Jim_Reference *refPtr;
+
+    if ((refPtr = Jim_GetReference(interp, objPtr)) == NULL)
+        return JIM_ERR;
+    Jim_IncrRefCount(cmdNamePtr);
+    if (refPtr->finalizerCmdNamePtr)
+        Jim_DecrRefCount(interp, refPtr->finalizerCmdNamePtr);
+    refPtr->finalizerCmdNamePtr = cmdNamePtr;
+    return JIM_OK;
+}
+
+int Jim_GetFinalizer(Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj **cmdNamePtrPtr)
+{
+    Jim_Reference *refPtr;
+
+    if ((refPtr = Jim_GetReference(interp, objPtr)) == NULL)
+        return JIM_ERR;
+    *cmdNamePtrPtr = refPtr->finalizerCmdNamePtr;
+    return JIM_OK;
+}
+
+/* -----------------------------------------------------------------------------
+ * References Garbage Collection
+ * ---------------------------------------------------------------------------*/
+
+/* This the hash table type for the "MARK" phase of the GC */
+static Jim_HashTableType JimRefMarkHashTableType = {
+    JimReferencesHTHashFunction,    /* hash function */
+    JimReferencesHTKeyDup,          /* key dup */
+    NULL,                           /* val dup */
+    JimReferencesHTKeyCompare,      /* key compare */
+    JimReferencesHTKeyDestructor,   /* key destructor */
+    NULL                            /* val destructor */
+};
+
+/* #define JIM_DEBUG_GC 1 */
+
+/* Performs the garbage collection. */
+int Jim_Collect(Jim_Interp *interp)
+{
+    Jim_HashTable marks;
+    Jim_HashTableIterator *htiter;
+    Jim_HashEntry *he;
+    Jim_Obj *objPtr;
+    int collected = 0;
+
+    /* Avoid recursive calls */
+    if (interp->lastCollectId == -1) {
+        /* Jim_Collect() already running. Return just now. */
+        return 0;
+    }
+    interp->lastCollectId = -1;
+
+    /* Mark all the references found into the 'mark' hash table.
+     * The references are searched in every live object that
+     * is of a type that can contain references. */
+    Jim_InitHashTable(&marks, &JimRefMarkHashTableType, NULL);
+    objPtr = interp->liveList;
+    while(objPtr) {
+        if (objPtr->typePtr == NULL ||
+            objPtr->typePtr->flags & JIM_TYPE_REFERENCES) {
+            const char *str, *p;
+            int len;
+
+            /* If the object is of type reference, to get the
+             * Id is simple... */
+            if (objPtr->typePtr == &referenceObjType) {
+                Jim_AddHashEntry(&marks,
+                    &objPtr->internalRep.refValue.id, NULL);
+#ifdef JIM_DEBUG_GC
+                Jim_fprintf(interp,interp->cookie_stdout,
+                    "MARK (reference): %d refcount: %d" JIM_NL, 
+                    (int) objPtr->internalRep.refValue.id,
+                    objPtr->refCount);
+#endif
+                objPtr = objPtr->nextObjPtr;
+                continue;
+            }
+            /* Get the string repr of the object we want
+             * to scan for references. */
+            p = str = Jim_GetString(objPtr, &len);
+            /* Skip objects too little to contain references. */
+            if (len < JIM_REFERENCE_SPACE) {
+                objPtr = objPtr->nextObjPtr;
+                continue;
+            }
+            /* Extract references from the object string repr. */
+            while(1) {
+                int i;
+                jim_wide id;
+                char buf[21];
+
+                if ((p = strstr(p, "<reference.<")) == NULL)
+                    break;
+                /* Check if it's a valid reference. */
+                if (len-(p-str) < JIM_REFERENCE_SPACE) break;
+                if (p[41] != '>' || p[19] != '>' || p[20] != '.') break;
+                for (i = 21; i <= 40; i++)
+                    if (!isdigit((int)p[i]))
+                        break;
+                /* Get the ID */
+                memcpy(buf, p+21, 20);
+                buf[20] = '\0';
+                Jim_StringToWide(buf, &id, 10);
+
+                /* Ok, a reference for the given ID
+                 * was found. Mark it. */
+                Jim_AddHashEntry(&marks, &id, NULL);
+#ifdef JIM_DEBUG_GC
+                Jim_fprintf(interp,interp->cookie_stdout,"MARK: %d" JIM_NL, (int)id);
+#endif
+                p += JIM_REFERENCE_SPACE;
+            }
+        }
+        objPtr = objPtr->nextObjPtr;
+    }
+
+    /* Run the references hash table to destroy every reference that
+     * is not referenced outside (not present in the mark HT). */
+    htiter = Jim_GetHashTableIterator(&interp->references);
+    while ((he = Jim_NextHashEntry(htiter)) != NULL) {
+        const jim_wide *refId;
+        Jim_Reference *refPtr;
+
+        refId = he->key;
+        /* Check if in the mark phase we encountered
+         * this reference. */
+        if (Jim_FindHashEntry(&marks, refId) == NULL) {
+#ifdef JIM_DEBUG_GC
+            Jim_fprintf(interp,interp->cookie_stdout,"COLLECTING %d" JIM_NL, (int)*refId);
+#endif
+            collected++;
+            /* Drop the reference, but call the
+             * finalizer first if registered. */
+            refPtr = he->val;
+            if (refPtr->finalizerCmdNamePtr) {
+                char *refstr = Jim_Alloc(JIM_REFERENCE_SPACE+1);
+                Jim_Obj *objv[3], *oldResult;
+
+                JimFormatReference(refstr, refPtr, *refId);
+
+                objv[0] = refPtr->finalizerCmdNamePtr;
+                objv[1] = Jim_NewStringObjNoAlloc(interp,
+                        refstr, 32);
+                objv[2] = refPtr->objPtr;
+                Jim_IncrRefCount(objv[0]);
+                Jim_IncrRefCount(objv[1]);
+                Jim_IncrRefCount(objv[2]);
+
+                /* Drop the reference itself */
+                Jim_DeleteHashEntry(&interp->references, refId);
+
+                /* Call the finalizer. Errors ignored. */
+                oldResult = interp->result;
+                Jim_IncrRefCount(oldResult);
+                Jim_EvalObjVector(interp, 3, objv);
+                Jim_SetResult(interp, oldResult);
+                Jim_DecrRefCount(interp, oldResult);
+
+                Jim_DecrRefCount(interp, objv[0]);
+                Jim_DecrRefCount(interp, objv[1]);
+                Jim_DecrRefCount(interp, objv[2]);
+            } else {
+                Jim_DeleteHashEntry(&interp->references, refId);
+            }
+        }
+    }
+    Jim_FreeHashTableIterator(htiter);
+    Jim_FreeHashTable(&marks);
+    interp->lastCollectId = interp->referenceNextId;
+    interp->lastCollectTime = time(NULL);
+    return collected;
+}
+
+#define JIM_COLLECT_ID_PERIOD 5000
+#define JIM_COLLECT_TIME_PERIOD 300
+
+void Jim_CollectIfNeeded(Jim_Interp *interp)
+{
+    jim_wide elapsedId;
+    int elapsedTime;
+    
+    elapsedId = interp->referenceNextId - interp->lastCollectId;
+    elapsedTime = time(NULL) - interp->lastCollectTime;
+
+
+    if (elapsedId > JIM_COLLECT_ID_PERIOD ||
+        elapsedTime > JIM_COLLECT_TIME_PERIOD) {
+        Jim_Collect(interp);
+    }
+}
+
+/* -----------------------------------------------------------------------------
+ * Interpreter related functions
+ * ---------------------------------------------------------------------------*/
+
+Jim_Interp *Jim_CreateInterp(void)
+{
+    Jim_Interp *i = Jim_Alloc(sizeof(*i));
+    Jim_Obj *pathPtr;
+
+    i->errorLine = 0;
+    i->errorFileName = Jim_StrDup("");
+    i->numLevels = 0;
+    i->maxNestingDepth = JIM_MAX_NESTING_DEPTH;
+    i->returnCode = JIM_OK;
+    i->exitCode = 0;
+    i->procEpoch = 0;
+    i->callFrameEpoch = 0;
+    i->liveList = i->freeList = NULL;
+    i->scriptFileName = Jim_StrDup("");
+    i->referenceNextId = 0;
+    i->lastCollectId = 0;
+    i->lastCollectTime = time(NULL);
+    i->freeFramesList = NULL;
+    i->prngState = NULL;
+    i->evalRetcodeLevel = -1;
+    i->cookie_stdin = stdin;
+    i->cookie_stdout = stdout;
+    i->cookie_stderr = stderr;
+	i->cb_fwrite   = ((size_t (*)( const void *, size_t, size_t, void *))(fwrite));
+	i->cb_fread    = ((size_t (*)(       void *, size_t, size_t, void *))(fread));
+	i->cb_vfprintf = ((int    (*)( void *, const char *fmt, va_list ))(vfprintf));
+	i->cb_fflush   = ((int    (*)( void *))(fflush));
+	i->cb_fgets    = ((char * (*)( char *, int, void *))(fgets));
+
+    /* Note that we can create objects only after the
+     * interpreter liveList and freeList pointers are
+     * initialized to NULL. */
+    Jim_InitHashTable(&i->commands, &JimCommandsHashTableType, i);
+    Jim_InitHashTable(&i->references, &JimReferencesHashTableType, i);
+    Jim_InitHashTable(&i->sharedStrings, &JimSharedStringsHashTableType,
+            NULL);
+    Jim_InitHashTable(&i->stub, &JimStringCopyHashTableType, NULL);
+    Jim_InitHashTable(&i->assocData, &JimAssocDataHashTableType, i);
+    Jim_InitHashTable(&i->packages, &JimStringKeyValCopyHashTableType, NULL);
+    i->framePtr = i->topFramePtr = JimCreateCallFrame(i);
+    i->emptyObj = Jim_NewEmptyStringObj(i);
+    i->result = i->emptyObj;
+    i->stackTrace = Jim_NewListObj(i, NULL, 0);
+    i->unknown = Jim_NewStringObj(i, "unknown", -1);
+    Jim_IncrRefCount(i->emptyObj);
+    Jim_IncrRefCount(i->result);
+    Jim_IncrRefCount(i->stackTrace);
+    Jim_IncrRefCount(i->unknown);
+
+    /* Initialize key variables every interpreter should contain */
+    pathPtr = Jim_NewStringObj(i, "./", -1);
+    Jim_SetVariableStr(i, "jim_libpath", pathPtr);
+    Jim_SetVariableStrWithStr(i, "jim_interactive", "0");
+
+    /* Export the core API to extensions */
+    JimRegisterCoreApi(i);
+    return i;
+}
+
+/* This is the only function Jim exports directly without
+ * to use the STUB system. It is only used by embedders
+ * in order to get an interpreter with the Jim API pointers
+ * registered. */
+Jim_Interp *ExportedJimCreateInterp(void)
+{
+    return Jim_CreateInterp();
+}
+
+void Jim_FreeInterp(Jim_Interp *i)
+{
+    Jim_CallFrame *cf = i->framePtr, *prevcf, *nextcf;
+    Jim_Obj *objPtr, *nextObjPtr;
+
+    Jim_DecrRefCount(i, i->emptyObj);
+    Jim_DecrRefCount(i, i->result);
+    Jim_DecrRefCount(i, i->stackTrace);
+    Jim_DecrRefCount(i, i->unknown);
+    Jim_Free((void*)i->errorFileName);
+    Jim_Free((void*)i->scriptFileName);
+    Jim_FreeHashTable(&i->commands);
+    Jim_FreeHashTable(&i->references);
+    Jim_FreeHashTable(&i->stub);
+    Jim_FreeHashTable(&i->assocData);
+    Jim_FreeHashTable(&i->packages);
+    Jim_Free(i->prngState);
+    /* Free the call frames list */
+    while(cf) {
+        prevcf = cf->parentCallFrame;
+        JimFreeCallFrame(i, cf, JIM_FCF_NONE);
+        cf = prevcf;
+    }
+    /* Check that the live object list is empty, otherwise
+     * there is a memory leak. */
+    if (i->liveList != NULL) {
+        Jim_Obj *objPtr = i->liveList;
+    
+        Jim_fprintf( i, i->cookie_stdout,JIM_NL "-------------------------------------" JIM_NL);
+        Jim_fprintf( i, i->cookie_stdout,"Objects still in the free list:" JIM_NL);
+        while(objPtr) {
+            const char *type = objPtr->typePtr ?
+                objPtr->typePtr->name : "";
+            Jim_fprintf( i, i->cookie_stdout,"%p \"%-10s\": '%.20s' (refCount: %d)" JIM_NL,
+                    objPtr, type,
+                    objPtr->bytes ? objPtr->bytes
+                    : "(null)", objPtr->refCount);
+            if (objPtr->typePtr == &sourceObjType) {
+                Jim_fprintf( i, i->cookie_stdout, "FILE %s LINE %d" JIM_NL,
+                objPtr->internalRep.sourceValue.fileName,
+                objPtr->internalRep.sourceValue.lineNumber);
+            }
+            objPtr = objPtr->nextObjPtr;
+        }
+        Jim_fprintf( i, i->cookie_stdout, "-------------------------------------" JIM_NL JIM_NL);
+        Jim_Panic(i,"Live list non empty freeing the interpreter! Leak?");
+    }
+    /* Free all the freed objects. */
+    objPtr = i->freeList;
+    while (objPtr) {
+        nextObjPtr = objPtr->nextObjPtr;
+        Jim_Free(objPtr);
+        objPtr = nextObjPtr;
+    }
+    /* Free cached CallFrame structures */
+    cf = i->freeFramesList;
+    while(cf) {
+        nextcf = cf->nextFramePtr;
+        if (cf->vars.table != NULL)
+            Jim_Free(cf->vars.table);
+        Jim_Free(cf);
+        cf = nextcf;
+    }
+    /* Free the sharedString hash table. Make sure to free it
+     * after every other Jim_Object was freed. */
+    Jim_FreeHashTable(&i->sharedStrings);
+    /* Free the interpreter structure. */
+    Jim_Free(i);
+}
+
+/* Store the call frame relative to the level represented by
+ * levelObjPtr into *framePtrPtr. If levelObjPtr == NULL, the
+ * level is assumed to be '1'.
+ *
+ * If a newLevelptr int pointer is specified, the function stores
+ * the absolute level integer value of the new target callframe into
+ * *newLevelPtr. (this is used to adjust interp->numLevels
+ * in the implementation of [uplevel], so that [info level] will
+ * return a correct information).
+ *
+ * This function accepts the 'level' argument in the form
+ * of the commands [uplevel] and [upvar].
+ *
+ * For a function accepting a relative integer as level suitable
+ * for implementation of [info level ?level?] check the
+ * GetCallFrameByInteger() function. */
+int Jim_GetCallFrameByLevel(Jim_Interp *interp, Jim_Obj *levelObjPtr,
+        Jim_CallFrame **framePtrPtr, int *newLevelPtr)
+{
+    long level;
+    const char *str;
+    Jim_CallFrame *framePtr;
+
+    if (newLevelPtr) *newLevelPtr = interp->numLevels;
+    if (levelObjPtr) {
+        str = Jim_GetString(levelObjPtr, NULL);
+        if (str[0] == '#') {
+            char *endptr;
+            /* speedup for the toplevel (level #0) */
+            if (str[1] == '0' && str[2] == '\0') {
+                if (newLevelPtr) *newLevelPtr = 0;
+                *framePtrPtr = interp->topFramePtr;
+                return JIM_OK;
+            }
+
+            level = strtol(str+1, &endptr, 0);
+            if (str[1] == '\0' || endptr[0] != '\0' || level < 0)
+                goto badlevel;
+            /* An 'absolute' level is converted into the
+             * 'number of levels to go back' format. */
+            level = interp->numLevels - level;
+            if (level < 0) goto badlevel;
+        } else {
+            if (Jim_GetLong(interp, levelObjPtr, &level) != JIM_OK || level < 0)
+                goto badlevel;
+        }
+    } else {
+        str = "1"; /* Needed to format the error message. */
+        level = 1;
+    }
+    /* Lookup */
+    framePtr = interp->framePtr;
+    if (newLevelPtr) *newLevelPtr = (*newLevelPtr)-level;
+    while (level--) {
+        framePtr = framePtr->parentCallFrame;
+        if (framePtr == NULL) goto badlevel;
+    }
+    *framePtrPtr = framePtr;
+    return JIM_OK;
+badlevel:
+    Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+    Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "bad level \"", str, "\"", NULL);
+    return JIM_ERR;
+}
+
+/* Similar to Jim_GetCallFrameByLevel() but the level is specified
+ * as a relative integer like in the [info level ?level?] command. */
+static int JimGetCallFrameByInteger(Jim_Interp *interp, Jim_Obj *levelObjPtr,
+        Jim_CallFrame **framePtrPtr)
+{
+    jim_wide level;
+    jim_wide relLevel; /* level relative to the current one. */
+    Jim_CallFrame *framePtr;
+
+    if (Jim_GetWide(interp, levelObjPtr, &level) != JIM_OK)
+        goto badlevel;
+    if (level > 0) {
+        /* An 'absolute' level is converted into the
+         * 'number of levels to go back' format. */
+        relLevel = interp->numLevels - level;
+    } else {
+        relLevel = -level;
+    }
+    /* Lookup */
+    framePtr = interp->framePtr;
+    while (relLevel--) {
+        framePtr = framePtr->parentCallFrame;
+        if (framePtr == NULL) goto badlevel;
+    }
+    *framePtrPtr = framePtr;
+    return JIM_OK;
+badlevel:
+    Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+    Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "bad level \"", Jim_GetString(levelObjPtr, NULL), "\"", NULL);
+    return JIM_ERR;
+}
+
+static void JimSetErrorFileName(Jim_Interp *interp, char *filename)
+{
+    Jim_Free((void*)interp->errorFileName);
+    interp->errorFileName = Jim_StrDup(filename);
+}
+
+static void JimSetErrorLineNumber(Jim_Interp *interp, int linenr)
+{
+    interp->errorLine = linenr;
+}
+
+static void JimResetStackTrace(Jim_Interp *interp)
+{
+    Jim_DecrRefCount(interp, interp->stackTrace);
+    interp->stackTrace = Jim_NewListObj(interp, NULL, 0);
+    Jim_IncrRefCount(interp->stackTrace);
+}
+
+static void JimAppendStackTrace(Jim_Interp *interp, const char *procname,
+        const char *filename, int linenr)
+{
+    if (Jim_IsShared(interp->stackTrace)) {
+        interp->stackTrace =
+            Jim_DuplicateObj(interp, interp->stackTrace);
+        Jim_IncrRefCount(interp->stackTrace);
+    }
+    Jim_ListAppendElement(interp, interp->stackTrace,
+            Jim_NewStringObj(interp, procname, -1));
+    Jim_ListAppendElement(interp, interp->stackTrace,
+            Jim_NewStringObj(interp, filename, -1));
+    Jim_ListAppendElement(interp, interp->stackTrace,
+            Jim_NewIntObj(interp, linenr));
+}
+
+int Jim_SetAssocData(Jim_Interp *interp, const char *key, Jim_InterpDeleteProc *delProc, void *data)
+{
+    AssocDataValue *assocEntryPtr = (AssocDataValue *)Jim_Alloc(sizeof(AssocDataValue));
+    assocEntryPtr->delProc = delProc;
+    assocEntryPtr->data = data;
+    return Jim_AddHashEntry(&interp->assocData, key, assocEntryPtr);
+}
+
+void *Jim_GetAssocData(Jim_Interp *interp, const char *key)
+{
+    Jim_HashEntry *entryPtr = Jim_FindHashEntry(&interp->assocData, key);
+    if (entryPtr != NULL) {
+        AssocDataValue *assocEntryPtr = (AssocDataValue *)entryPtr->val;
+        return assocEntryPtr->data;
+    }
+    return NULL;
+}
+
+int Jim_DeleteAssocData(Jim_Interp *interp, const char *key)
+{
+    return Jim_DeleteHashEntry(&interp->assocData, key);
+}
+
+int Jim_GetExitCode(Jim_Interp *interp) {
+    return interp->exitCode;
+}
+
+void *Jim_SetStdin(Jim_Interp *interp, void *fp)
+{
+    if (fp != NULL) interp->cookie_stdin = fp;
+    return interp->cookie_stdin;
+}
+
+void *Jim_SetStdout(Jim_Interp *interp, void *fp)
+{
+    if (fp != NULL) interp->cookie_stdout = fp;
+    return interp->cookie_stdout;
+}
+
+void *Jim_SetStderr(Jim_Interp *interp, void  *fp)
+{
+    if (fp != NULL) interp->cookie_stderr = fp;
+    return interp->cookie_stderr;
+}
+
+/* -----------------------------------------------------------------------------
+ * Shared strings.
+ * Every interpreter has an hash table where to put shared dynamically
+ * allocate strings that are likely to be used a lot of times.
+ * For example, in the 'source' object type, there is a pointer to
+ * the filename associated with that object. Every script has a lot
+ * of this objects with the identical file name, so it is wise to share
+ * this info.
+ *
+ * The API is trivial: Jim_GetSharedString(interp, "foobar")
+ * returns the pointer to the shared string. Every time a reference
+ * to the string is no longer used, the user should call
+ * Jim_ReleaseSharedString(interp, stringPointer). Once no one is using
+ * a given string, it is removed from the hash table.
+ * ---------------------------------------------------------------------------*/
+const char *Jim_GetSharedString(Jim_Interp *interp, const char *str)
+{
+    Jim_HashEntry *he = Jim_FindHashEntry(&interp->sharedStrings, str);
+
+    if (he == NULL) {
+        char *strCopy = Jim_StrDup(str);
+
+        Jim_AddHashEntry(&interp->sharedStrings, strCopy, (void*)1);
+        return strCopy;
+    } else {
+        long refCount = (long) he->val;
+
+        refCount++;
+        he->val = (void*) refCount;
+        return he->key;
+    }
+}
+
+void Jim_ReleaseSharedString(Jim_Interp *interp, const char *str)
+{
+    long refCount;
+    Jim_HashEntry *he = Jim_FindHashEntry(&interp->sharedStrings, str);
+
+    if (he == NULL)
+        Jim_Panic(interp,"Jim_ReleaseSharedString called with "
+              "unknown shared string '%s'", str);
+    refCount = (long) he->val;
+    refCount--;
+    if (refCount == 0) {
+        Jim_DeleteHashEntry(&interp->sharedStrings, str);
+    } else {
+        he->val = (void*) refCount;
+    }
+}
+
+/* -----------------------------------------------------------------------------
+ * Integer object
+ * ---------------------------------------------------------------------------*/
+#define JIM_INTEGER_SPACE 24
+
+static void UpdateStringOfInt(struct Jim_Obj *objPtr);
+static int SetIntFromAny(Jim_Interp *interp, Jim_Obj *objPtr, int flags);
+
+static Jim_ObjType intObjType = {
+    "int",
+    NULL,
+    NULL,
+    UpdateStringOfInt,
+    JIM_TYPE_NONE,
+};
+
+void UpdateStringOfInt(struct Jim_Obj *objPtr)
+{
+    int len;
+    char buf[JIM_INTEGER_SPACE+1];
+
+    len = Jim_WideToString(buf, objPtr->internalRep.wideValue);
+    objPtr->bytes = Jim_Alloc(len+1);
+    memcpy(objPtr->bytes, buf, len+1);
+    objPtr->length = len;
+}
+
+int SetIntFromAny(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    jim_wide wideValue;
+    const char *str;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, NULL);
+    /* Try to convert into a jim_wide */
+    if (Jim_StringToWide(str, &wideValue, 0) != JIM_OK) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "expected integer but got \"", str, "\"", NULL);
+        }
+        return JIM_ERR;
+    }
+    if ((wideValue == JIM_WIDE_MIN || wideValue == JIM_WIDE_MAX) &&
+        errno == ERANGE) {
+        Jim_SetResultString(interp,
+            "Integer value too big to be represented", -1);
+        return JIM_ERR;
+    }
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &intObjType;
+    objPtr->internalRep.wideValue = wideValue;
+    return JIM_OK;
+}
+
+int Jim_GetWide(Jim_Interp *interp, Jim_Obj *objPtr, jim_wide *widePtr)
+{
+    if (objPtr->typePtr != &intObjType &&
+        SetIntFromAny(interp, objPtr, JIM_ERRMSG) == JIM_ERR)
+        return JIM_ERR;
+    *widePtr = objPtr->internalRep.wideValue;
+    return JIM_OK;
+}
+
+/* Get a wide but does not set an error if the format is bad. */
+static int JimGetWideNoErr(Jim_Interp *interp, Jim_Obj *objPtr,
+        jim_wide *widePtr)
+{
+    if (objPtr->typePtr != &intObjType &&
+        SetIntFromAny(interp, objPtr, JIM_NONE) == JIM_ERR)
+        return JIM_ERR;
+    *widePtr = objPtr->internalRep.wideValue;
+    return JIM_OK;
+}
+
+int Jim_GetLong(Jim_Interp *interp, Jim_Obj *objPtr, long *longPtr)
+{
+    jim_wide wideValue;
+    int retval;
+
+    retval = Jim_GetWide(interp, objPtr, &wideValue);
+    if (retval == JIM_OK) {
+        *longPtr = (long) wideValue;
+        return JIM_OK;
+    }
+    return JIM_ERR;
+}
+
+void Jim_SetWide(Jim_Interp *interp, Jim_Obj *objPtr, jim_wide wideValue)
+{
+    if (Jim_IsShared(objPtr))
+        Jim_Panic(interp,"Jim_SetWide called with shared object");
+    if (objPtr->typePtr != &intObjType) {
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &intObjType;
+    }
+    Jim_InvalidateStringRep(objPtr);
+    objPtr->internalRep.wideValue = wideValue;
+}
+
+Jim_Obj *Jim_NewIntObj(Jim_Interp *interp, jim_wide wideValue)
+{
+    Jim_Obj *objPtr;
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &intObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.wideValue = wideValue;
+    return objPtr;
+}
+
+/* -----------------------------------------------------------------------------
+ * Double object
+ * ---------------------------------------------------------------------------*/
+#define JIM_DOUBLE_SPACE 30
+
+static void UpdateStringOfDouble(struct Jim_Obj *objPtr);
+static int SetDoubleFromAny(Jim_Interp *interp, Jim_Obj *objPtr);
+
+static Jim_ObjType doubleObjType = {
+    "double",
+    NULL,
+    NULL,
+    UpdateStringOfDouble,
+    JIM_TYPE_NONE,
+};
+
+void UpdateStringOfDouble(struct Jim_Obj *objPtr)
+{
+    int len;
+    char buf[JIM_DOUBLE_SPACE+1];
+
+    len = Jim_DoubleToString(buf, objPtr->internalRep.doubleValue);
+    objPtr->bytes = Jim_Alloc(len+1);
+    memcpy(objPtr->bytes, buf, len+1);
+    objPtr->length = len;
+}
+
+int SetDoubleFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    double doubleValue;
+    const char *str;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, NULL);
+    /* Try to convert into a double */
+    if (Jim_StringToDouble(str, &doubleValue) != JIM_OK) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "expected number but got '", str, "'", NULL);
+        return JIM_ERR;
+    }
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &doubleObjType;
+    objPtr->internalRep.doubleValue = doubleValue;
+    return JIM_OK;
+}
+
+int Jim_GetDouble(Jim_Interp *interp, Jim_Obj *objPtr, double *doublePtr)
+{
+    if (objPtr->typePtr != &doubleObjType &&
+        SetDoubleFromAny(interp, objPtr) == JIM_ERR)
+        return JIM_ERR;
+    *doublePtr = objPtr->internalRep.doubleValue;
+    return JIM_OK;
+}
+
+void Jim_SetDouble(Jim_Interp *interp, Jim_Obj *objPtr, double doubleValue)
+{
+    if (Jim_IsShared(objPtr))
+        Jim_Panic(interp,"Jim_SetDouble called with shared object");
+    if (objPtr->typePtr != &doubleObjType) {
+        Jim_FreeIntRep(interp, objPtr);
+        objPtr->typePtr = &doubleObjType;
+    }
+    Jim_InvalidateStringRep(objPtr);
+    objPtr->internalRep.doubleValue = doubleValue;
+}
+
+Jim_Obj *Jim_NewDoubleObj(Jim_Interp *interp, double doubleValue)
+{
+    Jim_Obj *objPtr;
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &doubleObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.doubleValue = doubleValue;
+    return objPtr;
+}
+
+/* -----------------------------------------------------------------------------
+ * List object
+ * ---------------------------------------------------------------------------*/
+static void ListAppendElement(Jim_Obj *listPtr, Jim_Obj *objPtr);
+static void FreeListInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupListInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static void UpdateStringOfList(struct Jim_Obj *objPtr);
+static int SetListFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+/* Note that while the elements of the list may contain references,
+ * the list object itself can't. This basically means that the
+ * list object string representation as a whole can't contain references
+ * that are not presents in the single elements. */
+static Jim_ObjType listObjType = {
+    "list",
+    FreeListInternalRep,
+    DupListInternalRep,
+    UpdateStringOfList,
+    JIM_TYPE_NONE,
+};
+
+void FreeListInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int i;
+
+    for (i = 0; i < objPtr->internalRep.listValue.len; i++) {
+        Jim_DecrRefCount(interp, objPtr->internalRep.listValue.ele[i]);
+    }
+    Jim_Free(objPtr->internalRep.listValue.ele);
+}
+
+void DupListInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    int i;
+    JIM_NOTUSED(interp);
+
+    dupPtr->internalRep.listValue.len = srcPtr->internalRep.listValue.len;
+    dupPtr->internalRep.listValue.maxLen = srcPtr->internalRep.listValue.maxLen;
+    dupPtr->internalRep.listValue.ele =
+        Jim_Alloc(sizeof(Jim_Obj*)*srcPtr->internalRep.listValue.maxLen);
+    memcpy(dupPtr->internalRep.listValue.ele, srcPtr->internalRep.listValue.ele,
+            sizeof(Jim_Obj*)*srcPtr->internalRep.listValue.len);
+    for (i = 0; i < dupPtr->internalRep.listValue.len; i++) {
+        Jim_IncrRefCount(dupPtr->internalRep.listValue.ele[i]);
+    }
+    dupPtr->typePtr = &listObjType;
+}
+
+/* The following function checks if a given string can be encoded
+ * into a list element without any kind of quoting, surrounded by braces,
+ * or using escapes to quote. */
+#define JIM_ELESTR_SIMPLE 0
+#define JIM_ELESTR_BRACE 1
+#define JIM_ELESTR_QUOTE 2
+static int ListElementQuotingType(const char *s, int len)
+{
+    int i, level, trySimple = 1;
+
+    /* Try with the SIMPLE case */
+    if (len == 0) return JIM_ELESTR_BRACE;
+    if (s[0] == '"' || s[0] == '{') {
+        trySimple = 0;
+        goto testbrace;
+    }
+    for (i = 0; i < len; i++) {
+        switch(s[i]) {
+        case ' ':
+        case '$':
+        case '"':
+        case '[':
+        case ']':
+        case ';':
+        case '\\':
+        case '\r':
+        case '\n':
+        case '\t':
+        case '\f':
+        case '\v':
+            trySimple = 0;
+        case '{':
+        case '}':
+            goto testbrace;
+        }
+    }
+    return JIM_ELESTR_SIMPLE;
+
+testbrace:
+    /* Test if it's possible to do with braces */
+    if (s[len-1] == '\\' ||
+        s[len-1] == ']') return JIM_ELESTR_QUOTE;
+    level = 0;
+    for (i = 0; i < len; i++) {
+        switch(s[i]) {
+        case '{': level++; break;
+        case '}': level--;
+              if (level < 0) return JIM_ELESTR_QUOTE;
+              break;
+        case '\\':
+              if (s[i+1] == '\n')
+                  return JIM_ELESTR_QUOTE;
+              else
+                  if (s[i+1] != '\0') i++;
+              break;
+        }
+    }
+    if (level == 0) {
+        if (!trySimple) return JIM_ELESTR_BRACE;
+        for (i = 0; i < len; i++) {
+            switch(s[i]) {
+            case ' ':
+            case '$':
+            case '"':
+            case '[':
+            case ']':
+            case ';':
+            case '\\':
+            case '\r':
+            case '\n':
+            case '\t':
+            case '\f':
+            case '\v':
+                return JIM_ELESTR_BRACE;
+                break;
+            }
+        }
+        return JIM_ELESTR_SIMPLE;
+    }
+    return JIM_ELESTR_QUOTE;
+}
+
+/* Returns the malloc-ed representation of a string
+ * using backslash to quote special chars. */
+char *BackslashQuoteString(const char *s, int len, int *qlenPtr)
+{
+    char *q = Jim_Alloc(len*2+1), *p;
+
+    p = q;
+    while(*s) {
+        switch (*s) {
+        case ' ':
+        case '$':
+        case '"':
+        case '[':
+        case ']':
+        case '{':
+        case '}':
+        case ';':
+        case '\\':
+            *p++ = '\\';
+            *p++ = *s++;
+            break;
+        case '\n': *p++ = '\\'; *p++ = 'n'; s++; break;
+        case '\r': *p++ = '\\'; *p++ = 'r'; s++; break;
+        case '\t': *p++ = '\\'; *p++ = 't'; s++; break;
+        case '\f': *p++ = '\\'; *p++ = 'f'; s++; break;
+        case '\v': *p++ = '\\'; *p++ = 'v'; s++; break;
+        default:
+            *p++ = *s++;
+            break;
+        }
+    }
+    *p = '\0';
+    *qlenPtr = p-q;
+    return q;
+}
+
+void UpdateStringOfList(struct Jim_Obj *objPtr)
+{
+    int i, bufLen, realLength;
+    const char *strRep;
+    char *p;
+    int *quotingType;
+    Jim_Obj **ele = objPtr->internalRep.listValue.ele;
+
+    /* (Over) Estimate the space needed. */
+    quotingType = Jim_Alloc(sizeof(int)*objPtr->internalRep.listValue.len+1);
+    bufLen = 0;
+    for (i = 0; i < objPtr->internalRep.listValue.len; i++) {
+        int len;
+
+        strRep = Jim_GetString(ele[i], &len);
+        quotingType[i] = ListElementQuotingType(strRep, len);
+        switch (quotingType[i]) {
+        case JIM_ELESTR_SIMPLE: bufLen += len; break;
+        case JIM_ELESTR_BRACE: bufLen += len+2; break;
+        case JIM_ELESTR_QUOTE: bufLen += len*2; break;
+        }
+        bufLen++; /* elements separator. */
+    }
+    bufLen++;
+
+    /* Generate the string rep. */
+    p = objPtr->bytes = Jim_Alloc(bufLen+1);
+    realLength = 0;
+    for (i = 0; i < objPtr->internalRep.listValue.len; i++) {
+        int len, qlen;
+        const char *strRep = Jim_GetString(ele[i], &len);
+        char *q;
+
+        switch(quotingType[i]) {
+        case JIM_ELESTR_SIMPLE:
+            memcpy(p, strRep, len);
+            p += len;
+            realLength += len;
+            break;
+        case JIM_ELESTR_BRACE:
+            *p++ = '{';
+            memcpy(p, strRep, len);
+            p += len;
+            *p++ = '}';
+            realLength += len+2;
+            break;
+        case JIM_ELESTR_QUOTE:
+            q = BackslashQuoteString(strRep, len, &qlen);
+            memcpy(p, q, qlen);
+            Jim_Free(q);
+            p += qlen;
+            realLength += qlen;
+            break;
+        }
+        /* Add a separating space */
+        if (i+1 != objPtr->internalRep.listValue.len) {
+            *p++ = ' ';
+            realLength ++;
+        }
+    }
+    *p = '\0'; /* nul term. */
+    objPtr->length = realLength;
+    Jim_Free(quotingType);
+}
+
+int SetListFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    struct JimParserCtx parser;
+    const char *str;
+    int strLen;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, &strLen);
+
+    /* Free the old internal repr just now and initialize the
+     * new one just now. The string->list conversion can't fail. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &listObjType;
+    objPtr->internalRep.listValue.len = 0;
+    objPtr->internalRep.listValue.maxLen = 0;
+    objPtr->internalRep.listValue.ele = NULL;
+
+    /* Convert into a list */
+    JimParserInit(&parser, str, strLen, 1);
+    while(!JimParserEof(&parser)) {
+        char *token;
+        int tokenLen, type;
+        Jim_Obj *elementPtr;
+
+        JimParseList(&parser);
+        if (JimParserTtype(&parser) != JIM_TT_STR &&
+            JimParserTtype(&parser) != JIM_TT_ESC)
+            continue;
+        token = JimParserGetToken(&parser, &tokenLen, &type, NULL);
+        elementPtr = Jim_NewStringObjNoAlloc(interp, token, tokenLen);
+        ListAppendElement(objPtr, elementPtr);
+    }
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_NewListObj(Jim_Interp *interp, Jim_Obj *const *elements, 
+        int len)
+{
+    Jim_Obj *objPtr;
+    int i;
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &listObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.listValue.ele = NULL;
+    objPtr->internalRep.listValue.len = 0;
+    objPtr->internalRep.listValue.maxLen = 0;
+    for (i = 0; i < len; i++) {
+        ListAppendElement(objPtr, elements[i]);
+    }
+    return objPtr;
+}
+
+/* Return a vector of Jim_Obj with the elements of a Jim list, and the
+ * length of the vector. Note that the user of this function should make
+ * sure that the list object can't shimmer while the vector returned
+ * is in use, this vector is the one stored inside the internal representation
+ * of the list object. This function is not exported, extensions should
+ * always access to the List object elements using Jim_ListIndex(). */
+static void JimListGetElements(Jim_Interp *interp, Jim_Obj *listObj, int *argc,
+        Jim_Obj ***listVec)
+{
+    Jim_ListLength(interp, listObj, argc);
+    assert(listObj->typePtr == &listObjType);
+    *listVec = listObj->internalRep.listValue.ele;
+}
+
+/* ListSortElements type values */
+enum {JIM_LSORT_ASCII, JIM_LSORT_NOCASE, JIM_LSORT_ASCII_DECR,
+      JIM_LSORT_NOCASE_DECR};
+
+/* Sort the internal rep of a list. */
+static int ListSortString(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    return Jim_StringCompareObj(*lhsObj, *rhsObj, 0);
+}
+
+static int ListSortStringDecr(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    return Jim_StringCompareObj(*lhsObj, *rhsObj, 0) * -1;
+}
+
+static int ListSortStringNoCase(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    return Jim_StringCompareObj(*lhsObj, *rhsObj, 1);
+}
+
+static int ListSortStringNoCaseDecr(Jim_Obj **lhsObj, Jim_Obj **rhsObj)
+{
+    return Jim_StringCompareObj(*lhsObj, *rhsObj, 1) * -1;
+}
+
+/* Sort a list *in place*. MUST be called with non-shared objects. */
+static void ListSortElements(Jim_Interp *interp, Jim_Obj *listObjPtr, int type)
+{
+    typedef int (qsort_comparator)(const void *, const void *);
+    int (*fn)(Jim_Obj**, Jim_Obj**);
+    Jim_Obj **vector;
+    int len;
+
+    if (Jim_IsShared(listObjPtr))
+        Jim_Panic(interp,"Jim_ListSortElements called with shared object");
+    if (listObjPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listObjPtr);
+
+    vector = listObjPtr->internalRep.listValue.ele;
+    len = listObjPtr->internalRep.listValue.len;
+    switch (type) {
+        case JIM_LSORT_ASCII: fn = ListSortString;  break;
+        case JIM_LSORT_NOCASE: fn = ListSortStringNoCase;  break;
+        case JIM_LSORT_ASCII_DECR: fn = ListSortStringDecr;  break;
+        case JIM_LSORT_NOCASE_DECR: fn = ListSortStringNoCaseDecr;  break;
+        default:
+            fn = NULL; /* avoid warning */
+            Jim_Panic(interp,"ListSort called with invalid sort type");
+    }
+    qsort(vector, len, sizeof(Jim_Obj *), (qsort_comparator *)fn);
+    Jim_InvalidateStringRep(listObjPtr);
+}
+
+/* This is the low-level function to append an element to a list.
+ * The higher-level Jim_ListAppendElement() performs shared object
+ * check and invalidate the string repr. This version is used
+ * in the internals of the List Object and is not exported.
+ *
+ * NOTE: this function can be called only against objects
+ * with internal type of List. */
+void ListAppendElement(Jim_Obj *listPtr, Jim_Obj *objPtr)
+{
+    int requiredLen = listPtr->internalRep.listValue.len + 1;
+
+    if (requiredLen > listPtr->internalRep.listValue.maxLen) {
+        int maxLen = requiredLen * 2;
+
+        listPtr->internalRep.listValue.ele =
+            Jim_Realloc(listPtr->internalRep.listValue.ele,
+                    sizeof(Jim_Obj*)*maxLen);
+        listPtr->internalRep.listValue.maxLen = maxLen;
+    }
+    listPtr->internalRep.listValue.ele[listPtr->internalRep.listValue.len] =
+        objPtr;
+    listPtr->internalRep.listValue.len ++;
+    Jim_IncrRefCount(objPtr);
+}
+
+/* This is the low-level function to insert elements into a list.
+ * The higher-level Jim_ListInsertElements() performs shared object
+ * check and invalidate the string repr. This version is used
+ * in the internals of the List Object and is not exported.
+ *
+ * NOTE: this function can be called only against objects
+ * with internal type of List. */
+void ListInsertElements(Jim_Obj *listPtr, int index, int elemc,
+        Jim_Obj *const *elemVec)
+{
+    int currentLen = listPtr->internalRep.listValue.len;
+    int requiredLen = currentLen + elemc;
+    int i;
+    Jim_Obj **point;
+
+    if (requiredLen > listPtr->internalRep.listValue.maxLen) {
+        int maxLen = requiredLen * 2;
+
+        listPtr->internalRep.listValue.ele =
+            Jim_Realloc(listPtr->internalRep.listValue.ele,
+                    sizeof(Jim_Obj*)*maxLen);
+        listPtr->internalRep.listValue.maxLen = maxLen;
+    }
+    point = listPtr->internalRep.listValue.ele + index;
+    memmove(point+elemc, point, (currentLen-index) * sizeof(Jim_Obj*));
+    for (i=0; i < elemc; ++i) {
+        point[i] = elemVec[i];
+        Jim_IncrRefCount(point[i]);
+    }
+    listPtr->internalRep.listValue.len += elemc;
+}
+
+/* Appends every element of appendListPtr into listPtr.
+ * Both have to be of the list type. */
+void ListAppendList(Jim_Obj *listPtr, Jim_Obj *appendListPtr)
+{
+    int i, oldLen = listPtr->internalRep.listValue.len;
+    int appendLen = appendListPtr->internalRep.listValue.len;
+    int requiredLen = oldLen + appendLen;
+
+    if (requiredLen > listPtr->internalRep.listValue.maxLen) {
+        int maxLen = requiredLen * 2;
+
+        listPtr->internalRep.listValue.ele =
+            Jim_Realloc(listPtr->internalRep.listValue.ele,
+                    sizeof(Jim_Obj*)*maxLen);
+        listPtr->internalRep.listValue.maxLen = maxLen;
+    }
+    for (i = 0; i < appendLen; i++) {
+        Jim_Obj *objPtr = appendListPtr->internalRep.listValue.ele[i];
+        listPtr->internalRep.listValue.ele[oldLen+i] = objPtr;
+        Jim_IncrRefCount(objPtr);
+    }
+    listPtr->internalRep.listValue.len += appendLen;
+}
+
+void Jim_ListAppendElement(Jim_Interp *interp, Jim_Obj *listPtr, Jim_Obj *objPtr)
+{
+    if (Jim_IsShared(listPtr))
+        Jim_Panic(interp,"Jim_ListAppendElement called with shared object");
+    if (listPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listPtr);
+    Jim_InvalidateStringRep(listPtr);
+    ListAppendElement(listPtr, objPtr);
+}
+
+void Jim_ListAppendList(Jim_Interp *interp, Jim_Obj *listPtr, Jim_Obj *appendListPtr)
+{
+    if (Jim_IsShared(listPtr))
+        Jim_Panic(interp,"Jim_ListAppendList called with shared object");
+    if (listPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listPtr);
+    Jim_InvalidateStringRep(listPtr);
+    ListAppendList(listPtr, appendListPtr);
+}
+
+void Jim_ListLength(Jim_Interp *interp, Jim_Obj *listPtr, int *intPtr)
+{
+    if (listPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listPtr);
+    *intPtr = listPtr->internalRep.listValue.len;
+}
+
+void Jim_ListInsertElements(Jim_Interp *interp, Jim_Obj *listPtr, int index,
+        int objc, Jim_Obj *const *objVec)
+{
+    if (Jim_IsShared(listPtr))
+        Jim_Panic(interp,"Jim_ListInsertElement called with shared object");
+    if (listPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listPtr);
+    if (index >= 0 && index > listPtr->internalRep.listValue.len)
+        index = listPtr->internalRep.listValue.len;
+    else if (index < 0 ) 
+        index = 0;
+    Jim_InvalidateStringRep(listPtr);
+    ListInsertElements(listPtr, index, objc, objVec);
+}
+
+int Jim_ListIndex(Jim_Interp *interp, Jim_Obj *listPtr, int index,
+        Jim_Obj **objPtrPtr, int flags)
+{
+    if (listPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listPtr);
+    if ((index >= 0 && index >= listPtr->internalRep.listValue.len) ||
+        (index < 0 && (-index-1) >= listPtr->internalRep.listValue.len)) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultString(interp,
+                "list index out of range", -1);
+        }
+        return JIM_ERR;
+    }
+    if (index < 0)
+        index = listPtr->internalRep.listValue.len+index;
+    *objPtrPtr = listPtr->internalRep.listValue.ele[index];
+    return JIM_OK;
+}
+
+static int ListSetIndex(Jim_Interp *interp, Jim_Obj *listPtr, int index,
+        Jim_Obj *newObjPtr, int flags)
+{
+    if (listPtr->typePtr != &listObjType)
+        SetListFromAny(interp, listPtr);
+    if ((index >= 0 && index >= listPtr->internalRep.listValue.len) ||
+        (index < 0 && (-index-1) >= listPtr->internalRep.listValue.len)) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResultString(interp,
+                "list index out of range", -1);
+        }
+        return JIM_ERR;
+    }
+    if (index < 0)
+        index = listPtr->internalRep.listValue.len+index;
+    Jim_DecrRefCount(interp, listPtr->internalRep.listValue.ele[index]);
+    listPtr->internalRep.listValue.ele[index] = newObjPtr;
+    Jim_IncrRefCount(newObjPtr);
+    return JIM_OK;
+}
+
+/* Modify the list stored into the variable named 'varNamePtr'
+ * setting the element specified by the 'indexc' indexes objects in 'indexv',
+ * with the new element 'newObjptr'. */
+int Jim_SetListIndex(Jim_Interp *interp, Jim_Obj *varNamePtr,
+        Jim_Obj *const *indexv, int indexc, Jim_Obj *newObjPtr)
+{
+    Jim_Obj *varObjPtr, *objPtr, *listObjPtr;
+    int shared, i, index;
+
+    varObjPtr = objPtr = Jim_GetVariable(interp, varNamePtr, JIM_ERRMSG);
+    if (objPtr == NULL)
+        return JIM_ERR;
+    if ((shared = Jim_IsShared(objPtr)))
+        varObjPtr = objPtr = Jim_DuplicateObj(interp, objPtr);
+    for (i = 0; i < indexc-1; i++) {
+        listObjPtr = objPtr;
+        if (Jim_GetIndex(interp, indexv[i], &index) != JIM_OK)
+            goto err;
+        if (Jim_ListIndex(interp, listObjPtr, index, &objPtr,
+                    JIM_ERRMSG) != JIM_OK) {
+            goto err;
+        }
+        if (Jim_IsShared(objPtr)) {
+            objPtr = Jim_DuplicateObj(interp, objPtr);
+            ListSetIndex(interp, listObjPtr, index, objPtr, JIM_NONE);
+        }
+        Jim_InvalidateStringRep(listObjPtr);
+    }
+    if (Jim_GetIndex(interp, indexv[indexc-1], &index) != JIM_OK)
+        goto err;
+    if (ListSetIndex(interp, objPtr, index, newObjPtr, JIM_ERRMSG) == JIM_ERR)
+        goto err;
+    Jim_InvalidateStringRep(objPtr);
+    Jim_InvalidateStringRep(varObjPtr);
+    if (Jim_SetVariable(interp, varNamePtr, varObjPtr) != JIM_OK)
+        goto err;
+    Jim_SetResult(interp, varObjPtr);
+    return JIM_OK;
+err:
+    if (shared) {
+        Jim_FreeNewObj(interp, varObjPtr);
+    }
+    return JIM_ERR;
+}
+
+Jim_Obj *Jim_ConcatObj(Jim_Interp *interp, int objc, Jim_Obj *const *objv)
+{
+    int i;
+
+    /* If all the objects in objv are lists without string rep.
+     * it's possible to return a list as result, that's the
+     * concatenation of all the lists. */
+    for (i = 0; i < objc; i++) {
+        if (objv[i]->typePtr != &listObjType || objv[i]->bytes)
+            break;
+    }
+    if (i == objc) {
+        Jim_Obj *objPtr = Jim_NewListObj(interp, NULL, 0);
+        for (i = 0; i < objc; i++)
+            Jim_ListAppendList(interp, objPtr, objv[i]);
+        return objPtr;
+    } else {
+        /* Else... we have to glue strings together */
+        int len = 0, objLen;
+        char *bytes, *p;
+
+        /* Compute the length */
+        for (i = 0; i < objc; i++) {
+            Jim_GetString(objv[i], &objLen);
+            len += objLen;
+        }
+        if (objc) len += objc-1;
+        /* Create the string rep, and a stinrg object holding it. */
+        p = bytes = Jim_Alloc(len+1);
+        for (i = 0; i < objc; i++) {
+            const char *s = Jim_GetString(objv[i], &objLen);
+            while (objLen && (*s == ' ' || *s == '\t' || *s == '\n'))
+            {
+                s++; objLen--; len--;
+            }
+            while (objLen && (s[objLen-1] == ' ' ||
+                s[objLen-1] == '\n' || s[objLen-1] == '\t')) {
+                objLen--; len--;
+            }
+            memcpy(p, s, objLen);
+            p += objLen;
+            if (objLen && i+1 != objc) {
+                *p++ = ' ';
+            } else if (i+1 != objc) {
+                /* Drop the space calcuated for this
+                 * element that is instead null. */
+                len--;
+            }
+        }
+        *p = '\0';
+        return Jim_NewStringObjNoAlloc(interp, bytes, len);
+    }
+}
+
+/* Returns a list composed of the elements in the specified range.
+ * first and start are directly accepted as Jim_Objects and
+ * processed for the end?-index? case. */
+Jim_Obj *Jim_ListRange(Jim_Interp *interp, Jim_Obj *listObjPtr, Jim_Obj *firstObjPtr, Jim_Obj *lastObjPtr)
+{
+    int first, last;
+    int len, rangeLen;
+
+    if (Jim_GetIndex(interp, firstObjPtr, &first) != JIM_OK ||
+        Jim_GetIndex(interp, lastObjPtr, &last) != JIM_OK)
+        return NULL;
+    Jim_ListLength(interp, listObjPtr, &len); /* will convert into list */
+    first = JimRelToAbsIndex(len, first);
+    last = JimRelToAbsIndex(len, last);
+    JimRelToAbsRange(len, first, last, &first, &last, &rangeLen);
+    return Jim_NewListObj(interp,
+            listObjPtr->internalRep.listValue.ele+first, rangeLen);
+}
+
+/* -----------------------------------------------------------------------------
+ * Dict object
+ * ---------------------------------------------------------------------------*/
+static void FreeDictInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupDictInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static void UpdateStringOfDict(struct Jim_Obj *objPtr);
+static int SetDictFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+/* Dict HashTable Type.
+ *
+ * Keys and Values are Jim objects. */
+
+unsigned int JimObjectHTHashFunction(const void *key)
+{
+    const char *str;
+    Jim_Obj *objPtr = (Jim_Obj*) key;
+    int len, h;
+
+    str = Jim_GetString(objPtr, &len);
+    h = Jim_GenHashFunction((unsigned char*)str, len);
+    return h;
+}
+
+int JimObjectHTKeyCompare(void *privdata, const void *key1, const void *key2)
+{
+    JIM_NOTUSED(privdata);
+
+    return Jim_StringEqObj((Jim_Obj*)key1, (Jim_Obj*)key2, 0);
+}
+
+static void JimObjectHTKeyValDestructor(void *interp, void *val)
+{
+    Jim_Obj *objPtr = val;
+
+    Jim_DecrRefCount(interp, objPtr);
+}
+
+static Jim_HashTableType JimDictHashTableType = {
+    JimObjectHTHashFunction,            /* hash function */
+    NULL,                               /* key dup */
+    NULL,                               /* val dup */
+    JimObjectHTKeyCompare,              /* key compare */
+    (void(*)(void*, const void*))       /* ATTENTION: const cast */
+        JimObjectHTKeyValDestructor,    /* key destructor */
+    JimObjectHTKeyValDestructor         /* val destructor */
+};
+
+/* Note that while the elements of the dict may contain references,
+ * the list object itself can't. This basically means that the
+ * dict object string representation as a whole can't contain references
+ * that are not presents in the single elements. */
+static Jim_ObjType dictObjType = {
+    "dict",
+    FreeDictInternalRep,
+    DupDictInternalRep,
+    UpdateStringOfDict,
+    JIM_TYPE_NONE,
+};
+
+void FreeDictInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    JIM_NOTUSED(interp);
+
+    Jim_FreeHashTable(objPtr->internalRep.ptr);
+    Jim_Free(objPtr->internalRep.ptr);
+}
+
+void DupDictInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    Jim_HashTable *ht, *dupHt;
+    Jim_HashTableIterator *htiter;
+    Jim_HashEntry *he;
+
+    /* Create a new hash table */
+    ht = srcPtr->internalRep.ptr;
+    dupHt = Jim_Alloc(sizeof(*dupHt));
+    Jim_InitHashTable(dupHt, &JimDictHashTableType, interp);
+    if (ht->size != 0)
+        Jim_ExpandHashTable(dupHt, ht->size);
+    /* Copy every element from the source to the dup hash table */
+    htiter = Jim_GetHashTableIterator(ht);
+    while ((he = Jim_NextHashEntry(htiter)) != NULL) {
+        const Jim_Obj *keyObjPtr = he->key;
+        Jim_Obj *valObjPtr = he->val;
+
+        Jim_IncrRefCount((Jim_Obj*)keyObjPtr);  /* ATTENTION: const cast */
+        Jim_IncrRefCount(valObjPtr);
+        Jim_AddHashEntry(dupHt, keyObjPtr, valObjPtr);
+    }
+    Jim_FreeHashTableIterator(htiter);
+
+    dupPtr->internalRep.ptr = dupHt;
+    dupPtr->typePtr = &dictObjType;
+}
+
+void UpdateStringOfDict(struct Jim_Obj *objPtr)
+{
+    int i, bufLen, realLength;
+    const char *strRep;
+    char *p;
+    int *quotingType, objc;
+    Jim_HashTable *ht;
+    Jim_HashTableIterator *htiter;
+    Jim_HashEntry *he;
+    Jim_Obj **objv;
+
+    /* Trun the hash table into a flat vector of Jim_Objects. */
+    ht = objPtr->internalRep.ptr;
+    objc = ht->used*2;
+    objv = Jim_Alloc(objc*sizeof(Jim_Obj*));
+    htiter = Jim_GetHashTableIterator(ht);
+    i = 0;
+    while ((he = Jim_NextHashEntry(htiter)) != NULL) {
+        objv[i++] = (Jim_Obj*)he->key;  /* ATTENTION: const cast */
+        objv[i++] = he->val;
+    }
+    Jim_FreeHashTableIterator(htiter);
+    /* (Over) Estimate the space needed. */
+    quotingType = Jim_Alloc(sizeof(int)*objc);
+    bufLen = 0;
+    for (i = 0; i < objc; i++) {
+        int len;
+
+        strRep = Jim_GetString(objv[i], &len);
+        quotingType[i] = ListElementQuotingType(strRep, len);
+        switch (quotingType[i]) {
+        case JIM_ELESTR_SIMPLE: bufLen += len; break;
+        case JIM_ELESTR_BRACE: bufLen += len+2; break;
+        case JIM_ELESTR_QUOTE: bufLen += len*2; break;
+        }
+        bufLen++; /* elements separator. */
+    }
+    bufLen++;
+
+    /* Generate the string rep. */
+    p = objPtr->bytes = Jim_Alloc(bufLen+1);
+    realLength = 0;
+    for (i = 0; i < objc; i++) {
+        int len, qlen;
+        const char *strRep = Jim_GetString(objv[i], &len);
+        char *q;
+
+        switch(quotingType[i]) {
+        case JIM_ELESTR_SIMPLE:
+            memcpy(p, strRep, len);
+            p += len;
+            realLength += len;
+            break;
+        case JIM_ELESTR_BRACE:
+            *p++ = '{';
+            memcpy(p, strRep, len);
+            p += len;
+            *p++ = '}';
+            realLength += len+2;
+            break;
+        case JIM_ELESTR_QUOTE:
+            q = BackslashQuoteString(strRep, len, &qlen);
+            memcpy(p, q, qlen);
+            Jim_Free(q);
+            p += qlen;
+            realLength += qlen;
+            break;
+        }
+        /* Add a separating space */
+        if (i+1 != objc) {
+            *p++ = ' ';
+            realLength ++;
+        }
+    }
+    *p = '\0'; /* nul term. */
+    objPtr->length = realLength;
+    Jim_Free(quotingType);
+    Jim_Free(objv);
+}
+
+int SetDictFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    struct JimParserCtx parser;
+    Jim_HashTable *ht;
+    Jim_Obj *objv[2];
+    const char *str;
+    int i, strLen;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, &strLen);
+
+    /* Free the old internal repr just now and initialize the
+     * new one just now. The string->list conversion can't fail. */
+    Jim_FreeIntRep(interp, objPtr);
+    ht = Jim_Alloc(sizeof(*ht));
+    Jim_InitHashTable(ht, &JimDictHashTableType, interp);
+    objPtr->typePtr = &dictObjType;
+    objPtr->internalRep.ptr = ht;
+
+    /* Convert into a dict */
+    JimParserInit(&parser, str, strLen, 1);
+    i = 0;
+    while(!JimParserEof(&parser)) {
+        char *token;
+        int tokenLen, type;
+
+        JimParseList(&parser);
+        if (JimParserTtype(&parser) != JIM_TT_STR &&
+            JimParserTtype(&parser) != JIM_TT_ESC)
+            continue;
+        token = JimParserGetToken(&parser, &tokenLen, &type, NULL);
+        objv[i++] = Jim_NewStringObjNoAlloc(interp, token, tokenLen);
+        if (i == 2) {
+            i = 0;
+            Jim_IncrRefCount(objv[0]);
+            Jim_IncrRefCount(objv[1]);
+            if (Jim_AddHashEntry(ht, objv[0], objv[1]) != JIM_OK) {
+                Jim_HashEntry *he;
+                he = Jim_FindHashEntry(ht, objv[0]);
+                Jim_DecrRefCount(interp, objv[0]);
+                /* ATTENTION: const cast */
+                Jim_DecrRefCount(interp, (Jim_Obj*)he->val);
+                he->val = objv[1];
+            }
+        }
+    }
+    if (i) {
+        Jim_FreeNewObj(interp, objv[0]);
+        objPtr->typePtr = NULL;
+        Jim_FreeHashTable(ht);
+        Jim_SetResultString(interp, "invalid dictionary value: must be a list with an even number of elements", -1);
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* Dict object API */
+
+/* Add an element to a dict. objPtr must be of the "dict" type.
+ * The higer-level exported function is Jim_DictAddElement().
+ * If an element with the specified key already exists, the value
+ * associated is replaced with the new one.
+ *
+ * if valueObjPtr == NULL, the key is instead removed if it exists. */
+static void DictAddElement(Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *keyObjPtr, Jim_Obj *valueObjPtr)
+{
+    Jim_HashTable *ht = objPtr->internalRep.ptr;
+
+    if (valueObjPtr == NULL) { /* unset */
+        Jim_DeleteHashEntry(ht, keyObjPtr);
+        return;
+    }
+    Jim_IncrRefCount(keyObjPtr);
+    Jim_IncrRefCount(valueObjPtr);
+    if (Jim_AddHashEntry(ht, keyObjPtr, valueObjPtr) != JIM_OK) {
+        Jim_HashEntry *he = Jim_FindHashEntry(ht, keyObjPtr);
+        Jim_DecrRefCount(interp, keyObjPtr);
+        /* ATTENTION: const cast */
+        Jim_DecrRefCount(interp, (Jim_Obj*)he->val);
+        he->val = valueObjPtr;
+    }
+}
+
+/* Add an element, higher-level interface for DictAddElement().
+ * If valueObjPtr == NULL, the key is removed if it exists. */
+int Jim_DictAddElement(Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *keyObjPtr, Jim_Obj *valueObjPtr)
+{
+    if (Jim_IsShared(objPtr))
+        Jim_Panic(interp,"Jim_DictAddElement called with shared object");
+    if (objPtr->typePtr != &dictObjType) {
+        if (SetDictFromAny(interp, objPtr) != JIM_OK)
+            return JIM_ERR;
+    }
+    DictAddElement(interp, objPtr, keyObjPtr, valueObjPtr);
+    Jim_InvalidateStringRep(objPtr);
+    return JIM_OK;
+}
+
+Jim_Obj *Jim_NewDictObj(Jim_Interp *interp, Jim_Obj *const *elements, int len)
+{
+    Jim_Obj *objPtr;
+    int i;
+
+    if (len % 2)
+        Jim_Panic(interp,"Jim_NewDicObj() 'len' argument must be even");
+
+    objPtr = Jim_NewObj(interp);
+    objPtr->typePtr = &dictObjType;
+    objPtr->bytes = NULL;
+    objPtr->internalRep.ptr = Jim_Alloc(sizeof(Jim_HashTable));
+    Jim_InitHashTable(objPtr->internalRep.ptr, &JimDictHashTableType, interp);
+    for (i = 0; i < len; i += 2)
+        DictAddElement(interp, objPtr, elements[i], elements[i+1]);
+    return objPtr;
+}
+
+/* Return the value associated to the specified dict key */
+int Jim_DictKey(Jim_Interp *interp, Jim_Obj *dictPtr, Jim_Obj *keyPtr,
+        Jim_Obj **objPtrPtr, int flags)
+{
+    Jim_HashEntry *he;
+    Jim_HashTable *ht;
+
+    if (dictPtr->typePtr != &dictObjType) {
+        if (SetDictFromAny(interp, dictPtr) != JIM_OK)
+            return JIM_ERR;
+    }
+    ht = dictPtr->internalRep.ptr;
+    if ((he = Jim_FindHashEntry(ht, keyPtr)) == NULL) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "key \"", Jim_GetString(keyPtr, NULL),
+                    "\" not found in dictionary", NULL);
+        }
+        return JIM_ERR;
+    }
+    *objPtrPtr = he->val;
+    return JIM_OK;
+}
+
+/* Return the value associated to the specified dict keys */
+int Jim_DictKeysVector(Jim_Interp *interp, Jim_Obj *dictPtr,
+        Jim_Obj *const *keyv, int keyc, Jim_Obj **objPtrPtr, int flags)
+{
+    Jim_Obj *objPtr;
+    int i;
+
+    if (keyc == 0) {
+        *objPtrPtr = dictPtr;
+        return JIM_OK;
+    }
+
+    for (i = 0; i < keyc; i++) {
+        if (Jim_DictKey(interp, dictPtr, keyv[i], &objPtr, flags)
+                != JIM_OK)
+            return JIM_ERR;
+        dictPtr = objPtr;
+    }
+    *objPtrPtr = objPtr;
+    return JIM_OK;
+}
+
+/* Modify the dict stored into the variable named 'varNamePtr'
+ * setting the element specified by the 'keyc' keys objects in 'keyv',
+ * with the new value of the element 'newObjPtr'.
+ *
+ * If newObjPtr == NULL the operation is to remove the given key
+ * from the dictionary. */
+int Jim_SetDictKeysVector(Jim_Interp *interp, Jim_Obj *varNamePtr,
+        Jim_Obj *const *keyv, int keyc, Jim_Obj *newObjPtr)
+{
+    Jim_Obj *varObjPtr, *objPtr, *dictObjPtr;
+    int shared, i;
+
+    varObjPtr = objPtr = Jim_GetVariable(interp, varNamePtr, JIM_ERRMSG);
+    if (objPtr == NULL) {
+        if (newObjPtr == NULL) /* Cannot remove a key from non existing var */
+            return JIM_ERR;
+        varObjPtr = objPtr = Jim_NewDictObj(interp, NULL, 0);
+        if (Jim_SetVariable(interp, varNamePtr, objPtr) != JIM_OK) {
+            Jim_FreeNewObj(interp, varObjPtr);
+            return JIM_ERR;
+        }
+    }
+    if ((shared = Jim_IsShared(objPtr)))
+        varObjPtr = objPtr = Jim_DuplicateObj(interp, objPtr);
+    for (i = 0; i < keyc-1; i++) {
+        dictObjPtr = objPtr;
+
+        /* Check if it's a valid dictionary */
+        if (dictObjPtr->typePtr != &dictObjType) {
+            if (SetDictFromAny(interp, dictObjPtr) != JIM_OK)
+                goto err;
+        }
+        /* Check if the given key exists. */
+        Jim_InvalidateStringRep(dictObjPtr);
+        if (Jim_DictKey(interp, dictObjPtr, keyv[i], &objPtr,
+            newObjPtr ? JIM_NONE : JIM_ERRMSG) == JIM_OK)
+        {
+            /* This key exists at the current level.
+             * Make sure it's not shared!. */
+            if (Jim_IsShared(objPtr)) {
+                objPtr = Jim_DuplicateObj(interp, objPtr);
+                DictAddElement(interp, dictObjPtr, keyv[i], objPtr);
+            }
+        } else {
+            /* Key not found. If it's an [unset] operation
+             * this is an error. Only the last key may not
+             * exist. */
+            if (newObjPtr == NULL)
+                goto err;
+            /* Otherwise set an empty dictionary
+             * as key's value. */
+            objPtr = Jim_NewDictObj(interp, NULL, 0);
+            DictAddElement(interp, dictObjPtr, keyv[i], objPtr);
+        }
+    }
+    if (Jim_DictAddElement(interp, objPtr, keyv[keyc-1], newObjPtr)
+            != JIM_OK)
+        goto err;
+    Jim_InvalidateStringRep(objPtr);
+    Jim_InvalidateStringRep(varObjPtr);
+    if (Jim_SetVariable(interp, varNamePtr, varObjPtr) != JIM_OK)
+        goto err;
+    Jim_SetResult(interp, varObjPtr);
+    return JIM_OK;
+err:
+    if (shared) {
+        Jim_FreeNewObj(interp, varObjPtr);
+    }
+    return JIM_ERR;
+}
+
+/* -----------------------------------------------------------------------------
+ * Index object
+ * ---------------------------------------------------------------------------*/
+static void UpdateStringOfIndex(struct Jim_Obj *objPtr);
+static int SetIndexFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static Jim_ObjType indexObjType = {
+    "index",
+    NULL,
+    NULL,
+    UpdateStringOfIndex,
+    JIM_TYPE_NONE,
+};
+
+void UpdateStringOfIndex(struct Jim_Obj *objPtr)
+{
+    int len;
+    char buf[JIM_INTEGER_SPACE+1];
+
+    if (objPtr->internalRep.indexValue >= 0)
+        len = sprintf(buf, "%d", objPtr->internalRep.indexValue);
+    else if (objPtr->internalRep.indexValue == -1)
+        len = sprintf(buf, "end");
+    else {
+        len = sprintf(buf, "end%d", objPtr->internalRep.indexValue+1);
+    }
+    objPtr->bytes = Jim_Alloc(len+1);
+    memcpy(objPtr->bytes, buf, len+1);
+    objPtr->length = len;
+}
+
+int SetIndexFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int index, end = 0;
+    const char *str;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, NULL);
+    /* Try to convert into an index */
+    if (!strcmp(str, "end")) {
+        index = 0;
+        end = 1;
+    } else {
+        if (!strncmp(str, "end-", 4)) {
+            str += 4;
+            end = 1;
+        }
+        if (Jim_StringToIndex(str, &index) != JIM_OK) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "bad index \"", Jim_GetString(objPtr, NULL), "\": "
+                    "must be integer or end?-integer?", NULL);
+            return JIM_ERR;
+        }
+    }
+    if (end) {
+        if (index < 0)
+            index = INT_MAX;
+        else
+            index = -(index+1);
+    } else if (!end && index < 0)
+        index = -INT_MAX;
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &indexObjType;
+    objPtr->internalRep.indexValue = index;
+    return JIM_OK;
+}
+
+int Jim_GetIndex(Jim_Interp *interp, Jim_Obj *objPtr, int *indexPtr)
+{
+    /* Avoid shimmering if the object is an integer. */
+    if (objPtr->typePtr == &intObjType) {
+        jim_wide val = objPtr->internalRep.wideValue;
+        if (!(val < LONG_MIN) && !(val > LONG_MAX)) {
+            *indexPtr = (val < 0) ? -INT_MAX : (long)val;;
+            return JIM_OK;
+        }
+    }
+    if (objPtr->typePtr != &indexObjType &&
+        SetIndexFromAny(interp, objPtr) == JIM_ERR)
+        return JIM_ERR;
+    *indexPtr = objPtr->internalRep.indexValue;
+    return JIM_OK;
+}
+
+/* -----------------------------------------------------------------------------
+ * Return Code Object.
+ * ---------------------------------------------------------------------------*/
+
+static int SetReturnCodeFromAny(Jim_Interp *interp, Jim_Obj *objPtr);
+
+static Jim_ObjType returnCodeObjType = {
+    "return-code",
+    NULL,
+    NULL,
+    NULL,
+    JIM_TYPE_NONE,
+};
+
+int SetReturnCodeFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    const char *str;
+    int strLen, returnCode;
+    jim_wide wideValue;
+
+    /* Get the string representation */
+    str = Jim_GetString(objPtr, &strLen);
+    /* Try to convert into an integer */
+    if (JimGetWideNoErr(interp, objPtr, &wideValue) != JIM_ERR)
+        returnCode = (int) wideValue;
+    else if (!JimStringCompare(str, strLen, "ok", 2, JIM_NOCASE))
+        returnCode = JIM_OK;
+    else if (!JimStringCompare(str, strLen, "error", 5, JIM_NOCASE))
+        returnCode = JIM_ERR;
+    else if (!JimStringCompare(str, strLen, "return", 6, JIM_NOCASE))
+        returnCode = JIM_RETURN;
+    else if (!JimStringCompare(str, strLen, "break", 5, JIM_NOCASE))
+        returnCode = JIM_BREAK;
+    else if (!JimStringCompare(str, strLen, "continue", 8, JIM_NOCASE))
+        returnCode = JIM_CONTINUE;
+    else if (!JimStringCompare(str, strLen, "eval", 4, JIM_NOCASE))
+        returnCode = JIM_EVAL;
+    else if (!JimStringCompare(str, strLen, "exit", 4, JIM_NOCASE))
+        returnCode = JIM_EXIT;
+    else {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "expected return code but got '", str, "'",
+                NULL);
+        return JIM_ERR;
+    }
+    /* Free the old internal repr and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    objPtr->typePtr = &returnCodeObjType;
+    objPtr->internalRep.returnCode = returnCode;
+    return JIM_OK;
+}
+
+int Jim_GetReturnCode(Jim_Interp *interp, Jim_Obj *objPtr, int *intPtr)
+{
+    if (objPtr->typePtr != &returnCodeObjType &&
+        SetReturnCodeFromAny(interp, objPtr) == JIM_ERR)
+        return JIM_ERR;
+    *intPtr = objPtr->internalRep.returnCode;
+    return JIM_OK;
+}
+
+/* -----------------------------------------------------------------------------
+ * Expression Parsing
+ * ---------------------------------------------------------------------------*/
+static int JimParseExprOperator(struct JimParserCtx *pc);
+static int JimParseExprNumber(struct JimParserCtx *pc);
+static int JimParseExprIrrational(struct JimParserCtx *pc);
+
+/* Exrp's Stack machine operators opcodes. */
+
+/* Binary operators (numbers) */
+#define JIM_EXPROP_BINARY_NUM_FIRST 0 /* first */
+#define JIM_EXPROP_MUL 0
+#define JIM_EXPROP_DIV 1
+#define JIM_EXPROP_MOD 2
+#define JIM_EXPROP_SUB 3
+#define JIM_EXPROP_ADD 4
+#define JIM_EXPROP_LSHIFT 5
+#define JIM_EXPROP_RSHIFT 6
+#define JIM_EXPROP_ROTL 7
+#define JIM_EXPROP_ROTR 8
+#define JIM_EXPROP_LT 9
+#define JIM_EXPROP_GT 10
+#define JIM_EXPROP_LTE 11
+#define JIM_EXPROP_GTE 12
+#define JIM_EXPROP_NUMEQ 13
+#define JIM_EXPROP_NUMNE 14
+#define JIM_EXPROP_BITAND 15
+#define JIM_EXPROP_BITXOR 16
+#define JIM_EXPROP_BITOR 17
+#define JIM_EXPROP_LOGICAND 18
+#define JIM_EXPROP_LOGICOR 19
+#define JIM_EXPROP_LOGICAND_LEFT 20
+#define JIM_EXPROP_LOGICOR_LEFT 21
+#define JIM_EXPROP_POW 22
+#define JIM_EXPROP_BINARY_NUM_LAST 22 /* last */
+
+/* Binary operators (strings) */
+#define JIM_EXPROP_STREQ 23
+#define JIM_EXPROP_STRNE 24
+
+/* Unary operators (numbers) */
+#define JIM_EXPROP_NOT 25
+#define JIM_EXPROP_BITNOT 26
+#define JIM_EXPROP_UNARYMINUS 27
+#define JIM_EXPROP_UNARYPLUS 28
+#define JIM_EXPROP_LOGICAND_RIGHT 29
+#define JIM_EXPROP_LOGICOR_RIGHT 30
+
+/* Ternary operators */
+#define JIM_EXPROP_TERNARY 31
+
+/* Operands */
+#define JIM_EXPROP_NUMBER 32
+#define JIM_EXPROP_COMMAND 33
+#define JIM_EXPROP_VARIABLE 34
+#define JIM_EXPROP_DICTSUGAR 35
+#define JIM_EXPROP_SUBST 36
+#define JIM_EXPROP_STRING 37
+
+/* Operators table */
+typedef struct Jim_ExprOperator {
+    const char *name;
+    int precedence;
+    int arity;
+    int opcode;
+} Jim_ExprOperator;
+
+/* name - precedence - arity - opcode */
+static struct Jim_ExprOperator Jim_ExprOperators[] = {
+    {"!", 300, 1, JIM_EXPROP_NOT},
+    {"~", 300, 1, JIM_EXPROP_BITNOT},
+    {"unarymin", 300, 1, JIM_EXPROP_UNARYMINUS},
+    {"unaryplus", 300, 1, JIM_EXPROP_UNARYPLUS},
+
+    {"**", 250, 2, JIM_EXPROP_POW},
+
+    {"*", 200, 2, JIM_EXPROP_MUL},
+    {"/", 200, 2, JIM_EXPROP_DIV},
+    {"%", 200, 2, JIM_EXPROP_MOD},
+
+    {"-", 100, 2, JIM_EXPROP_SUB},
+    {"+", 100, 2, JIM_EXPROP_ADD},
+
+    {"<<<", 90, 3, JIM_EXPROP_ROTL},
+    {">>>", 90, 3, JIM_EXPROP_ROTR},
+    {"<<", 90, 2, JIM_EXPROP_LSHIFT},
+    {">>", 90, 2, JIM_EXPROP_RSHIFT},
+
+    {"<",  80, 2, JIM_EXPROP_LT},
+    {">",  80, 2, JIM_EXPROP_GT},
+    {"<=", 80, 2, JIM_EXPROP_LTE},
+    {">=", 80, 2, JIM_EXPROP_GTE},
+
+    {"==", 70, 2, JIM_EXPROP_NUMEQ},
+    {"!=", 70, 2, JIM_EXPROP_NUMNE},
+
+    {"eq", 60, 2, JIM_EXPROP_STREQ},
+    {"ne", 60, 2, JIM_EXPROP_STRNE},
+
+    {"&", 50, 2, JIM_EXPROP_BITAND},
+    {"^", 49, 2, JIM_EXPROP_BITXOR},
+    {"|", 48, 2, JIM_EXPROP_BITOR},
+
+    {"&&", 10, 2, JIM_EXPROP_LOGICAND},
+    {"||", 10, 2, JIM_EXPROP_LOGICOR},
+
+    {"?", 5, 3, JIM_EXPROP_TERNARY},
+    /* private operators */
+    {NULL, 10, 2, JIM_EXPROP_LOGICAND_LEFT},
+    {NULL, 10, 1, JIM_EXPROP_LOGICAND_RIGHT},
+    {NULL, 10, 2, JIM_EXPROP_LOGICOR_LEFT},
+    {NULL, 10, 1, JIM_EXPROP_LOGICOR_RIGHT},
+};
+
+#define JIM_EXPR_OPERATORS_NUM \
+    (sizeof(Jim_ExprOperators)/sizeof(struct Jim_ExprOperator))
+
+int JimParseExpression(struct JimParserCtx *pc)
+{
+    /* Discard spaces and quoted newline */
+    while(*(pc->p) == ' ' ||
+          *(pc->p) == '\t' ||
+          *(pc->p) == '\r' ||
+          *(pc->p) == '\n' ||
+            (*(pc->p) == '\\' && *(pc->p+1) == '\n')) {
+        pc->p++; pc->len--;
+    }
+
+    if (pc->len == 0) {
+        pc->tstart = pc->tend = pc->p;
+        pc->tline = pc->linenr;
+        pc->tt = JIM_TT_EOL;
+        pc->eof = 1;
+        return JIM_OK;
+    }
+    switch(*(pc->p)) {
+    case '(':
+        pc->tstart = pc->tend = pc->p;
+        pc->tline = pc->linenr;
+        pc->tt = JIM_TT_SUBEXPR_START;
+        pc->p++; pc->len--;
+        break;
+    case ')':
+        pc->tstart = pc->tend = pc->p;
+        pc->tline = pc->linenr;
+        pc->tt = JIM_TT_SUBEXPR_END;
+        pc->p++; pc->len--;
+        break;
+    case '[':
+        return JimParseCmd(pc);
+        break;
+    case '$':
+        if (JimParseVar(pc) == JIM_ERR)
+            return JimParseExprOperator(pc);
+        else
+            return JIM_OK;
+        break;
+    case '-':
+        if ((pc->tt == JIM_TT_NONE || pc->tt == JIM_TT_EXPR_OPERATOR) &&
+            isdigit((int)*(pc->p+1)))
+            return JimParseExprNumber(pc);
+        else
+            return JimParseExprOperator(pc);
+        break;
+    case '0': case '1': case '2': case '3': case '4':
+    case '5': case '6': case '7': case '8': case '9': case '.':
+        return JimParseExprNumber(pc);
+        break;
+    case '"':
+    case '{':
+        /* Here it's possible to reuse the List String parsing. */
+        pc->tt = JIM_TT_NONE; /* Make sure it's sensed as a new word. */
+        return JimParseListStr(pc);
+        break;
+    case 'N': case 'I':
+    case 'n': case 'i':
+        if (JimParseExprIrrational(pc) == JIM_ERR)
+            return JimParseExprOperator(pc);
+        break;
+    default:
+        return JimParseExprOperator(pc);
+        break;
+    }
+    return JIM_OK;
+}
+
+int JimParseExprNumber(struct JimParserCtx *pc)
+{
+    int allowdot = 1;
+    int allowhex = 0;
+
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    if (*pc->p == '-') {
+        pc->p++; pc->len--;
+    }
+    while (  isdigit((int)*pc->p) 
+          || (allowhex && isxdigit((int)*pc->p) )
+          || (allowdot && *pc->p == '.') 
+          || (pc->p-pc->tstart == 1 && *pc->tstart == '0' &&
+              (*pc->p == 'x' || *pc->p == 'X'))
+          )
+    {
+        if ((*pc->p == 'x') || (*pc->p == 'X')) {
+            allowhex = 1;
+            allowdot = 0;
+		}
+        if (*pc->p == '.')
+            allowdot = 0;
+        pc->p++; pc->len--;
+        if (!allowdot && *pc->p == 'e' && *(pc->p+1) == '-') {
+            pc->p += 2; pc->len -= 2;
+        }
+    }
+    pc->tend = pc->p-1;
+    pc->tt = JIM_TT_EXPR_NUMBER;
+    return JIM_OK;
+}
+
+int JimParseExprIrrational(struct JimParserCtx *pc)
+{
+    const char *Tokens[] = {"NaN", "nan", "NAN", "Inf", "inf", "INF", NULL};
+    const char **token;
+    for (token = Tokens; *token != NULL; token++) {
+        int len = strlen(*token);
+        if (strncmp(*token, pc->p, len) == 0) {
+            pc->tstart = pc->p;
+            pc->tend = pc->p + len - 1;
+            pc->p += len; pc->len -= len;
+            pc->tline = pc->linenr;
+            pc->tt = JIM_TT_EXPR_NUMBER;
+            return JIM_OK;
+        }
+    }
+    return JIM_ERR;
+}
+
+int JimParseExprOperator(struct JimParserCtx *pc)
+{
+    int i;
+    int bestIdx = -1, bestLen = 0;
+
+    /* Try to get the longest match. */
+    for (i = 0; i < (signed)JIM_EXPR_OPERATORS_NUM; i++) {
+        const char *opname;
+        int oplen;
+
+        opname = Jim_ExprOperators[i].name;
+        if (opname == NULL) continue;
+        oplen = strlen(opname);
+
+        if (strncmp(opname, pc->p, oplen) == 0 && oplen > bestLen) {
+            bestIdx = i;
+            bestLen = oplen;
+        }
+    }
+    if (bestIdx == -1) return JIM_ERR;
+    pc->tstart = pc->p;
+    pc->tend = pc->p + bestLen - 1;
+    pc->p += bestLen; pc->len -= bestLen;
+    pc->tline = pc->linenr;
+    pc->tt = JIM_TT_EXPR_OPERATOR;
+    return JIM_OK;
+}
+
+struct Jim_ExprOperator *JimExprOperatorInfo(const char *opname)
+{
+    int i;
+    for (i = 0; i < (signed)JIM_EXPR_OPERATORS_NUM; i++)
+        if (Jim_ExprOperators[i].name &&
+            strcmp(opname, Jim_ExprOperators[i].name) == 0)
+            return &Jim_ExprOperators[i];
+    return NULL;
+}
+
+struct Jim_ExprOperator *JimExprOperatorInfoByOpcode(int opcode)
+{
+    int i;
+    for (i = 0; i < (signed)JIM_EXPR_OPERATORS_NUM; i++)
+        if (Jim_ExprOperators[i].opcode == opcode)
+            return &Jim_ExprOperators[i];
+    return NULL;
+}
+
+/* -----------------------------------------------------------------------------
+ * Expression Object
+ * ---------------------------------------------------------------------------*/
+static void FreeExprInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupExprInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static int SetExprFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr);
+
+static Jim_ObjType exprObjType = {
+    "expression",
+    FreeExprInternalRep,
+    DupExprInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+/* Expr bytecode structure */
+typedef struct ExprByteCode {
+    int *opcode;        /* Integer array of opcodes. */
+    Jim_Obj **obj;      /* Array of associated Jim Objects. */
+    int len;            /* Bytecode length */
+    int inUse;          /* Used for sharing. */
+} ExprByteCode;
+
+void FreeExprInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    int i;
+    ExprByteCode *expr = (void*) objPtr->internalRep.ptr;
+
+    expr->inUse--;
+    if (expr->inUse != 0) return;
+    for (i = 0; i < expr->len; i++)
+        Jim_DecrRefCount(interp, expr->obj[i]);
+    Jim_Free(expr->opcode);
+    Jim_Free(expr->obj);
+    Jim_Free(expr);
+}
+
+void DupExprInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    JIM_NOTUSED(interp);
+    JIM_NOTUSED(srcPtr);
+
+    /* Just returns an simple string. */
+    dupPtr->typePtr = NULL;
+}
+
+/* Add a new instruction to an expression bytecode structure. */
+static void ExprObjAddInstr(Jim_Interp *interp, ExprByteCode *expr,
+        int opcode, char *str, int len)
+{
+    expr->opcode = Jim_Realloc(expr->opcode, sizeof(int)*(expr->len+1));
+    expr->obj = Jim_Realloc(expr->obj, sizeof(Jim_Obj*)*(expr->len+1));
+    expr->opcode[expr->len] = opcode;
+    expr->obj[expr->len] = Jim_NewStringObjNoAlloc(interp, str, len);
+    Jim_IncrRefCount(expr->obj[expr->len]);
+    expr->len++;
+}
+
+/* Check if an expr program looks correct. */
+static int ExprCheckCorrectness(ExprByteCode *expr)
+{
+    int i;
+    int stacklen = 0;
+
+    /* Try to check if there are stack underflows,
+     * and make sure at the end of the program there is
+     * a single result on the stack. */
+    for (i = 0; i < expr->len; i++) {
+        switch(expr->opcode[i]) {
+        case JIM_EXPROP_NUMBER:
+        case JIM_EXPROP_STRING:
+        case JIM_EXPROP_SUBST:
+        case JIM_EXPROP_VARIABLE:
+        case JIM_EXPROP_DICTSUGAR:
+        case JIM_EXPROP_COMMAND:
+            stacklen++;
+            break;
+        case JIM_EXPROP_NOT:
+        case JIM_EXPROP_BITNOT:
+        case JIM_EXPROP_UNARYMINUS:
+        case JIM_EXPROP_UNARYPLUS:
+            /* Unary operations */
+            if (stacklen < 1) return JIM_ERR;
+            break;
+        case JIM_EXPROP_ADD:
+        case JIM_EXPROP_SUB:
+        case JIM_EXPROP_MUL:
+        case JIM_EXPROP_DIV:
+        case JIM_EXPROP_MOD:
+        case JIM_EXPROP_LT:
+        case JIM_EXPROP_GT:
+        case JIM_EXPROP_LTE:
+        case JIM_EXPROP_GTE:
+        case JIM_EXPROP_ROTL:
+        case JIM_EXPROP_ROTR:
+        case JIM_EXPROP_LSHIFT:
+        case JIM_EXPROP_RSHIFT:
+        case JIM_EXPROP_NUMEQ:
+        case JIM_EXPROP_NUMNE:
+        case JIM_EXPROP_STREQ:
+        case JIM_EXPROP_STRNE:
+        case JIM_EXPROP_BITAND:
+        case JIM_EXPROP_BITXOR:
+        case JIM_EXPROP_BITOR:
+        case JIM_EXPROP_LOGICAND:
+        case JIM_EXPROP_LOGICOR:
+        case JIM_EXPROP_POW:
+            /* binary operations */
+            if (stacklen < 2) return JIM_ERR;
+            stacklen--;
+            break;
+        default:
+            Jim_Panic(NULL,"Default opcode reached ExprCheckCorrectness");
+            break;
+        }
+    }
+    if (stacklen != 1) return JIM_ERR;
+    return JIM_OK;
+}
+
+static void ExprShareLiterals(Jim_Interp *interp, ExprByteCode *expr,
+        ScriptObj *topLevelScript)
+{
+    int i;
+
+    return;
+    for (i = 0; i < expr->len; i++) {
+        Jim_Obj *foundObjPtr;
+
+        if (expr->obj[i] == NULL) continue;
+        foundObjPtr = ScriptSearchLiteral(interp, topLevelScript,
+                NULL, expr->obj[i]);
+        if (foundObjPtr != NULL) {
+            Jim_IncrRefCount(foundObjPtr);
+            Jim_DecrRefCount(interp, expr->obj[i]);
+            expr->obj[i] = foundObjPtr;
+        }
+    }
+}
+
+/* This procedure converts every occurrence of || and && opereators
+ * in lazy unary versions.
+ *
+ * a b || is converted into:
+ *
+ * a <offset> |L b |R
+ *
+ * a b && is converted into:
+ *
+ * a <offset> &L b &R
+ *
+ * "|L" checks if 'a' is true:
+ *   1) if it is true pushes 1 and skips <offset> istructions to reach
+ *      the opcode just after |R.
+ *   2) if it is false does nothing.
+ * "|R" checks if 'b' is true:
+ *   1) if it is true pushes 1, otherwise pushes 0.
+ *
+ * "&L" checks if 'a' is true:
+ *   1) if it is true does nothing.
+ *   2) If it is false pushes 0 and skips <offset> istructions to reach
+ *      the opcode just after &R
+ * "&R" checks if 'a' is true:
+ *      if it is true pushes 1, otherwise pushes 0.
+ */
+static void ExprMakeLazy(Jim_Interp *interp, ExprByteCode *expr)
+{
+    while (1) {
+        int index = -1, leftindex, arity, i, offset;
+        Jim_ExprOperator *op;
+
+        /* Search for || or && */
+        for (i = 0; i < expr->len; i++) {
+            if (expr->opcode[i] == JIM_EXPROP_LOGICAND ||
+                expr->opcode[i] == JIM_EXPROP_LOGICOR) {
+                index = i;
+                break;
+            }
+        }
+        if (index == -1) return;
+        /* Search for the end of the first operator */
+        leftindex = index-1;
+        arity = 1;
+        while(arity) {
+            switch(expr->opcode[leftindex]) {
+            case JIM_EXPROP_NUMBER:
+            case JIM_EXPROP_COMMAND:
+            case JIM_EXPROP_VARIABLE:
+            case JIM_EXPROP_DICTSUGAR:
+            case JIM_EXPROP_SUBST:
+            case JIM_EXPROP_STRING:
+                break;
+            default:
+                op = JimExprOperatorInfoByOpcode(expr->opcode[i]);
+                if (op == NULL) {
+                    Jim_Panic(interp,"Default reached in ExprMakeLazy()");
+                }
+                arity += op->arity;
+                break;
+            }
+            arity--;
+            leftindex--;
+        }
+        leftindex++;
+        expr->opcode = Jim_Realloc(expr->opcode, sizeof(int)*(expr->len+2));
+        expr->obj = Jim_Realloc(expr->obj, sizeof(Jim_Obj*)*(expr->len+2));
+        memmove(&expr->opcode[leftindex+2], &expr->opcode[leftindex],
+                sizeof(int)*(expr->len-leftindex));
+        memmove(&expr->obj[leftindex+2], &expr->obj[leftindex],
+                sizeof(Jim_Obj*)*(expr->len-leftindex));
+        expr->len += 2;
+        index += 2;
+        offset = (index-leftindex)-1;
+        Jim_DecrRefCount(interp, expr->obj[index]);
+        if (expr->opcode[index] == JIM_EXPROP_LOGICAND) {
+            expr->opcode[leftindex+1] = JIM_EXPROP_LOGICAND_LEFT;
+            expr->opcode[index] = JIM_EXPROP_LOGICAND_RIGHT;
+            expr->obj[leftindex+1] = Jim_NewStringObj(interp, "&L", -1);
+            expr->obj[index] = Jim_NewStringObj(interp, "&R", -1);
+        } else {
+            expr->opcode[leftindex+1] = JIM_EXPROP_LOGICOR_LEFT;
+            expr->opcode[index] = JIM_EXPROP_LOGICOR_RIGHT;
+            expr->obj[leftindex+1] = Jim_NewStringObj(interp, "|L", -1);
+            expr->obj[index] = Jim_NewStringObj(interp, "|R", -1);
+        }
+        expr->opcode[leftindex] = JIM_EXPROP_NUMBER;
+        expr->obj[leftindex] = Jim_NewIntObj(interp, offset);
+        Jim_IncrRefCount(expr->obj[index]);
+        Jim_IncrRefCount(expr->obj[leftindex]);
+        Jim_IncrRefCount(expr->obj[leftindex+1]);
+    }
+}
+
+/* This method takes the string representation of an expression
+ * and generates a program for the Expr's stack-based VM. */
+int SetExprFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr)
+{
+    int exprTextLen;
+    const char *exprText = Jim_GetString(objPtr, &exprTextLen);
+    struct JimParserCtx parser;
+    int i, shareLiterals;
+    ExprByteCode *expr = Jim_Alloc(sizeof(*expr));
+    Jim_Stack stack;
+    Jim_ExprOperator *op;
+
+    /* Perform literal sharing with the current procedure
+     * running only if this expression appears to be not generated
+     * at runtime. */
+    shareLiterals = objPtr->typePtr == &sourceObjType;
+
+    expr->opcode = NULL;
+    expr->obj = NULL;
+    expr->len = 0;
+    expr->inUse = 1;
+
+    Jim_InitStack(&stack);
+    JimParserInit(&parser, exprText, exprTextLen, 1);
+    while(!JimParserEof(&parser)) {
+        char *token;
+        int len, type;
+
+        if (JimParseExpression(&parser) != JIM_OK) {
+            Jim_SetResultString(interp, "Syntax error in expression", -1);
+            goto err;
+        }
+        token = JimParserGetToken(&parser, &len, &type, NULL);
+        if (type == JIM_TT_EOL) {
+            Jim_Free(token);
+            break;
+        }
+        switch(type) {
+        case JIM_TT_STR:
+            ExprObjAddInstr(interp, expr, JIM_EXPROP_STRING, token, len);
+            break;
+        case JIM_TT_ESC:
+            ExprObjAddInstr(interp, expr, JIM_EXPROP_SUBST, token, len);
+            break;
+        case JIM_TT_VAR:
+            ExprObjAddInstr(interp, expr, JIM_EXPROP_VARIABLE, token, len);
+            break;
+        case JIM_TT_DICTSUGAR:
+            ExprObjAddInstr(interp, expr, JIM_EXPROP_DICTSUGAR, token, len);
+            break;
+        case JIM_TT_CMD:
+            ExprObjAddInstr(interp, expr, JIM_EXPROP_COMMAND, token, len);
+            break;
+        case JIM_TT_EXPR_NUMBER:
+            ExprObjAddInstr(interp, expr, JIM_EXPROP_NUMBER, token, len);
+            break;
+        case JIM_TT_EXPR_OPERATOR:
+            op = JimExprOperatorInfo(token);
+            while(1) {
+                Jim_ExprOperator *stackTopOp;
+
+                if (Jim_StackPeek(&stack) != NULL) {
+                    stackTopOp = JimExprOperatorInfo(Jim_StackPeek(&stack));
+                } else {
+                    stackTopOp = NULL;
+                }
+                if (Jim_StackLen(&stack) && op->arity != 1 &&
+                    stackTopOp && stackTopOp->precedence >= op->precedence)
+                {
+                    ExprObjAddInstr(interp, expr, stackTopOp->opcode,
+                        Jim_StackPeek(&stack), -1);
+                    Jim_StackPop(&stack);
+                } else {
+                    break;
+                }
+            }
+            Jim_StackPush(&stack, token);
+            break;
+        case JIM_TT_SUBEXPR_START:
+            Jim_StackPush(&stack, Jim_StrDup("("));
+            Jim_Free(token);
+            break;
+        case JIM_TT_SUBEXPR_END:
+            {
+                int found = 0;
+                while(Jim_StackLen(&stack)) {
+                    char *opstr = Jim_StackPop(&stack);
+                    if (!strcmp(opstr, "(")) {
+                        Jim_Free(opstr);
+                        found = 1;
+                        break;
+                    }
+                    op = JimExprOperatorInfo(opstr);
+                    ExprObjAddInstr(interp, expr, op->opcode, opstr, -1);
+                }
+                if (!found) {
+                    Jim_SetResultString(interp,
+                        "Unexpected close parenthesis", -1);
+                    goto err;
+                }
+            }
+            Jim_Free(token);
+            break;
+        default:
+            Jim_Panic(interp,"Default reached in SetExprFromAny()");
+            break;
+        }
+    }
+    while (Jim_StackLen(&stack)) {
+        char *opstr = Jim_StackPop(&stack);
+        op = JimExprOperatorInfo(opstr);
+        if (op == NULL && !strcmp(opstr, "(")) {
+            Jim_Free(opstr);
+            Jim_SetResultString(interp, "Missing close parenthesis", -1);
+            goto err;
+        }
+        ExprObjAddInstr(interp, expr, op->opcode, opstr, -1);
+    }
+    /* Check program correctness. */
+    if (ExprCheckCorrectness(expr) != JIM_OK) {
+        Jim_SetResultString(interp, "Invalid expression", -1);
+        goto err;
+    }
+
+    /* Free the stack used for the compilation. */
+    Jim_FreeStackElements(&stack, Jim_Free);
+    Jim_FreeStack(&stack);
+
+    /* Convert || and && operators in unary |L |R and &L &R for lazyness */
+    ExprMakeLazy(interp, expr);
+
+    /* Perform literal sharing */
+    if (shareLiterals && interp->framePtr->procBodyObjPtr) {
+        Jim_Obj *bodyObjPtr = interp->framePtr->procBodyObjPtr;
+        if (bodyObjPtr->typePtr == &scriptObjType) {
+            ScriptObj *bodyScript = bodyObjPtr->internalRep.ptr;
+            ExprShareLiterals(interp, expr, bodyScript);
+        }
+    }
+
+    /* Free the old internal rep and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    Jim_SetIntRepPtr(objPtr, expr);
+    objPtr->typePtr = &exprObjType;
+    return JIM_OK;
+
+err:    /* we jump here on syntax/compile errors. */
+    Jim_FreeStackElements(&stack, Jim_Free);
+    Jim_FreeStack(&stack);
+    Jim_Free(expr->opcode);
+    for (i = 0; i < expr->len; i++) {
+        Jim_DecrRefCount(interp,expr->obj[i]);
+    }
+    Jim_Free(expr->obj);
+    Jim_Free(expr);
+    return JIM_ERR;
+}
+
+ExprByteCode *Jim_GetExpression(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    if (objPtr->typePtr != &exprObjType) {
+        if (SetExprFromAny(interp, objPtr) != JIM_OK)
+            return NULL;
+    }
+    return (ExprByteCode*) Jim_GetIntRepPtr(objPtr);
+}
+
+/* -----------------------------------------------------------------------------
+ * Expressions evaluation.
+ * Jim uses a specialized stack-based virtual machine for expressions,
+ * that takes advantage of the fact that expr's operators
+ * can't be redefined.
+ *
+ * Jim_EvalExpression() uses the bytecode compiled by
+ * SetExprFromAny() method of the "expression" object.
+ *
+ * On success a Tcl Object containing the result of the evaluation
+ * is stored into expResultPtrPtr (having refcount of 1), and JIM_OK is
+ * returned.
+ * On error the function returns a retcode != to JIM_OK and set a suitable
+ * error on the interp.
+ * ---------------------------------------------------------------------------*/
+#define JIM_EE_STATICSTACK_LEN 10
+
+int Jim_EvalExpression(Jim_Interp *interp, Jim_Obj *exprObjPtr,
+        Jim_Obj **exprResultPtrPtr)
+{
+    ExprByteCode *expr;
+    Jim_Obj **stack, *staticStack[JIM_EE_STATICSTACK_LEN];
+    int stacklen = 0, i, error = 0, errRetCode = JIM_ERR;
+
+    Jim_IncrRefCount(exprObjPtr);
+    expr = Jim_GetExpression(interp, exprObjPtr);
+    if (!expr) {
+        Jim_DecrRefCount(interp, exprObjPtr);
+        return JIM_ERR; /* error in expression. */
+    }
+    /* In order to avoid that the internal repr gets freed due to
+     * shimmering of the exprObjPtr's object, we make the internal rep
+     * shared. */
+    expr->inUse++;
+
+    /* The stack-based expr VM itself */
+
+    /* Stack allocation. Expr programs have the feature that
+     * a program of length N can't require a stack longer than
+     * N. */
+    if (expr->len > JIM_EE_STATICSTACK_LEN)
+        stack = Jim_Alloc(sizeof(Jim_Obj*)*expr->len);
+    else
+        stack = staticStack;
+
+    /* Execute every istruction */
+    for (i = 0; i < expr->len; i++) {
+        Jim_Obj *A, *B, *objPtr;
+        jim_wide wA, wB, wC;
+        double dA, dB, dC;
+        const char *sA, *sB;
+        int Alen, Blen, retcode;
+        int opcode = expr->opcode[i];
+
+        if (opcode == JIM_EXPROP_NUMBER || opcode == JIM_EXPROP_STRING) {
+            stack[stacklen++] = expr->obj[i];
+            Jim_IncrRefCount(expr->obj[i]);
+        } else if (opcode == JIM_EXPROP_VARIABLE) {
+            objPtr = Jim_GetVariable(interp, expr->obj[i], JIM_ERRMSG);
+            if (objPtr == NULL) {
+                error = 1;
+                goto err;
+            }
+            stack[stacklen++] = objPtr;
+            Jim_IncrRefCount(objPtr);
+        } else if (opcode == JIM_EXPROP_SUBST) {
+            if ((retcode = Jim_SubstObj(interp, expr->obj[i],
+                        &objPtr, JIM_NONE)) != JIM_OK)
+            {
+                error = 1;
+                errRetCode = retcode;
+                goto err;
+            }
+            stack[stacklen++] = objPtr;
+            Jim_IncrRefCount(objPtr);
+        } else if (opcode == JIM_EXPROP_DICTSUGAR) {
+            objPtr = Jim_ExpandDictSugar(interp, expr->obj[i]);
+            if (objPtr == NULL) {
+                error = 1;
+                goto err;
+            }
+            stack[stacklen++] = objPtr;
+            Jim_IncrRefCount(objPtr);
+        } else if (opcode == JIM_EXPROP_COMMAND) {
+            if ((retcode = Jim_EvalObj(interp, expr->obj[i])) != JIM_OK) {
+                error = 1;
+                errRetCode = retcode;
+                goto err;
+            }
+            stack[stacklen++] = interp->result;
+            Jim_IncrRefCount(interp->result);
+        } else if (opcode >= JIM_EXPROP_BINARY_NUM_FIRST &&
+                   opcode <= JIM_EXPROP_BINARY_NUM_LAST)
+        {
+            /* Note that there isn't to increment the
+             * refcount of objects. the references are moved
+             * from stack to A and B. */
+            B = stack[--stacklen];
+            A = stack[--stacklen];
+
+            /* --- Integer --- */
+            if ((A->typePtr == &doubleObjType && !A->bytes) ||
+                (B->typePtr == &doubleObjType && !B->bytes) ||
+                JimGetWideNoErr(interp, A, &wA) != JIM_OK ||
+                JimGetWideNoErr(interp, B, &wB) != JIM_OK) {
+                goto trydouble;
+            }
+            Jim_DecrRefCount(interp, A);
+            Jim_DecrRefCount(interp, B);
+            switch(expr->opcode[i]) {
+            case JIM_EXPROP_ADD: wC = wA+wB; break;
+            case JIM_EXPROP_SUB: wC = wA-wB; break;
+            case JIM_EXPROP_MUL: wC = wA*wB; break;
+            case JIM_EXPROP_LT: wC = wA<wB; break;
+            case JIM_EXPROP_GT: wC = wA>wB; break;
+            case JIM_EXPROP_LTE: wC = wA<=wB; break;
+            case JIM_EXPROP_GTE: wC = wA>=wB; break;
+            case JIM_EXPROP_LSHIFT: wC = wA<<wB; break;
+            case JIM_EXPROP_RSHIFT: wC = wA>>wB; break;
+            case JIM_EXPROP_NUMEQ: wC = wA==wB; break;
+            case JIM_EXPROP_NUMNE: wC = wA!=wB; break;
+            case JIM_EXPROP_BITAND: wC = wA&wB; break;
+            case JIM_EXPROP_BITXOR: wC = wA^wB; break;
+            case JIM_EXPROP_BITOR: wC = wA|wB; break;
+            case JIM_EXPROP_POW: wC = JimPowWide(wA,wB); break;
+            case JIM_EXPROP_LOGICAND_LEFT:
+                if (wA == 0) {
+                    i += (int)wB;
+                    wC = 0;
+                } else {
+                    continue;
+                }
+                break;
+            case JIM_EXPROP_LOGICOR_LEFT:
+                if (wA != 0) {
+                    i += (int)wB;
+                    wC = 1;
+                } else {
+                    continue;
+                }
+                break;
+            case JIM_EXPROP_DIV:
+                if (wB == 0) goto divbyzero;
+                wC = wA/wB;
+                break;
+            case JIM_EXPROP_MOD:
+                if (wB == 0) goto divbyzero;
+                wC = wA%wB;
+                break;
+            case JIM_EXPROP_ROTL: {
+                /* uint32_t would be better. But not everyone has inttypes.h?*/
+                unsigned long uA = (unsigned long)wA;
+#ifdef _MSC_VER
+                wC = _rotl(uA,(unsigned long)wB);
+#else
+                const unsigned int S = sizeof(unsigned long) * 8;
+                wC = (unsigned long)((uA<<wB)|(uA>>(S-wB)));
+#endif
+                break;
+            }
+            case JIM_EXPROP_ROTR: {
+                unsigned long uA = (unsigned long)wA;
+#ifdef _MSC_VER
+                wC = _rotr(uA,(unsigned long)wB);
+#else
+                const unsigned int S = sizeof(unsigned long) * 8;
+                wC = (unsigned long)((uA>>wB)|(uA<<(S-wB)));
+#endif
+                break;
+            }
+
+            default:
+                wC = 0; /* avoid gcc warning */
+                break;
+            }
+            stack[stacklen] = Jim_NewIntObj(interp, wC);
+            Jim_IncrRefCount(stack[stacklen]);
+            stacklen++;
+            continue;
+trydouble:
+            /* --- Double --- */
+            if (Jim_GetDouble(interp, A, &dA) != JIM_OK ||
+                Jim_GetDouble(interp, B, &dB) != JIM_OK) {
+                Jim_DecrRefCount(interp, A);
+                Jim_DecrRefCount(interp, B);
+                error = 1;
+                goto err;
+            }
+            Jim_DecrRefCount(interp, A);
+            Jim_DecrRefCount(interp, B);
+            switch(expr->opcode[i]) {
+            case JIM_EXPROP_ROTL:
+            case JIM_EXPROP_ROTR:
+            case JIM_EXPROP_LSHIFT:
+            case JIM_EXPROP_RSHIFT:
+            case JIM_EXPROP_BITAND:
+            case JIM_EXPROP_BITXOR:
+            case JIM_EXPROP_BITOR:
+            case JIM_EXPROP_MOD:
+            case JIM_EXPROP_POW:
+                Jim_SetResultString(interp,
+                    "Got floating-point value where integer was expected", -1);
+                error = 1;
+                goto err;
+                break;
+            case JIM_EXPROP_ADD: dC = dA+dB; break;
+            case JIM_EXPROP_SUB: dC = dA-dB; break;
+            case JIM_EXPROP_MUL: dC = dA*dB; break;
+            case JIM_EXPROP_LT: dC = dA<dB; break;
+            case JIM_EXPROP_GT: dC = dA>dB; break;
+            case JIM_EXPROP_LTE: dC = dA<=dB; break;
+            case JIM_EXPROP_GTE: dC = dA>=dB; break;
+            case JIM_EXPROP_NUMEQ: dC = dA==dB; break;
+            case JIM_EXPROP_NUMNE: dC = dA!=dB; break;
+            case JIM_EXPROP_LOGICAND_LEFT:
+                if (dA == 0) {
+                    i += (int)dB;
+                    dC = 0;
+                } else {
+                    continue;
+                }
+                break;
+            case JIM_EXPROP_LOGICOR_LEFT:
+                if (dA != 0) {
+                    i += (int)dB;
+                    dC = 1;
+                } else {
+                    continue;
+                }
+                break;
+            case JIM_EXPROP_DIV:
+                if (dB == 0) goto divbyzero;
+                dC = dA/dB;
+                break;
+            default:
+                dC = 0; /* avoid gcc warning */
+                break;
+            }
+            stack[stacklen] = Jim_NewDoubleObj(interp, dC);
+            Jim_IncrRefCount(stack[stacklen]);
+            stacklen++;
+        } else if (opcode == JIM_EXPROP_STREQ || opcode == JIM_EXPROP_STRNE) {
+            B = stack[--stacklen];
+            A = stack[--stacklen];
+            sA = Jim_GetString(A, &Alen);
+            sB = Jim_GetString(B, &Blen);
+            switch(expr->opcode[i]) {
+            case JIM_EXPROP_STREQ:
+                if (Alen == Blen && memcmp(sA, sB, Alen) ==0)
+                    wC = 1;
+                else
+                    wC = 0;
+                break;
+            case JIM_EXPROP_STRNE:
+                if (Alen != Blen || memcmp(sA, sB, Alen) != 0)
+                    wC = 1;
+                else
+                    wC = 0;
+                break;
+            default:
+                wC = 0; /* avoid gcc warning */
+                break;
+            }
+            Jim_DecrRefCount(interp, A);
+            Jim_DecrRefCount(interp, B);
+            stack[stacklen] = Jim_NewIntObj(interp, wC);
+            Jim_IncrRefCount(stack[stacklen]);
+            stacklen++;
+        } else if (opcode == JIM_EXPROP_NOT ||
+                   opcode == JIM_EXPROP_BITNOT ||
+                   opcode == JIM_EXPROP_LOGICAND_RIGHT ||
+                   opcode == JIM_EXPROP_LOGICOR_RIGHT) {
+            /* Note that there isn't to increment the
+             * refcount of objects. the references are moved
+             * from stack to A and B. */
+            A = stack[--stacklen];
+
+            /* --- Integer --- */
+            if ((A->typePtr == &doubleObjType && !A->bytes) ||
+                JimGetWideNoErr(interp, A, &wA) != JIM_OK) {
+                goto trydouble_unary;
+            }
+            Jim_DecrRefCount(interp, A);
+            switch(expr->opcode[i]) {
+            case JIM_EXPROP_NOT: wC = !wA; break;
+            case JIM_EXPROP_BITNOT: wC = ~wA; break;
+            case JIM_EXPROP_LOGICAND_RIGHT:
+            case JIM_EXPROP_LOGICOR_RIGHT: wC = (wA != 0); break;
+            default:
+                wC = 0; /* avoid gcc warning */
+                break;
+            }
+            stack[stacklen] = Jim_NewIntObj(interp, wC);
+            Jim_IncrRefCount(stack[stacklen]);
+            stacklen++;
+            continue;
+trydouble_unary:
+            /* --- Double --- */
+            if (Jim_GetDouble(interp, A, &dA) != JIM_OK) {
+                Jim_DecrRefCount(interp, A);
+                error = 1;
+                goto err;
+            }
+            Jim_DecrRefCount(interp, A);
+            switch(expr->opcode[i]) {
+            case JIM_EXPROP_NOT: dC = !dA; break;
+            case JIM_EXPROP_LOGICAND_RIGHT:
+            case JIM_EXPROP_LOGICOR_RIGHT: dC = (dA != 0); break;
+            case JIM_EXPROP_BITNOT:
+                Jim_SetResultString(interp,
+                    "Got floating-point value where integer was expected", -1);
+                error = 1;
+                goto err;
+                break;
+            default:
+                dC = 0; /* avoid gcc warning */
+                break;
+            }
+            stack[stacklen] = Jim_NewDoubleObj(interp, dC);
+            Jim_IncrRefCount(stack[stacklen]);
+            stacklen++;
+        } else {
+            Jim_Panic(interp,"Unknown opcode in Jim_EvalExpression");
+        }
+    }
+err:
+    /* There is no need to decerement the inUse field because
+     * this reference is transfered back into the exprObjPtr. */
+    Jim_FreeIntRep(interp, exprObjPtr);
+    exprObjPtr->typePtr = &exprObjType;
+    Jim_SetIntRepPtr(exprObjPtr, expr);
+    Jim_DecrRefCount(interp, exprObjPtr);
+    if (!error) {
+        *exprResultPtrPtr = stack[0];
+        Jim_IncrRefCount(stack[0]);
+        errRetCode = JIM_OK;
+    }
+    for (i = 0; i < stacklen; i++) {
+        Jim_DecrRefCount(interp, stack[i]);
+    }
+    if (stack != staticStack)
+        Jim_Free(stack);
+    return errRetCode;
+divbyzero:
+    error = 1;
+    Jim_SetResultString(interp, "Division by zero", -1);
+    goto err;
+}
+
+int Jim_GetBoolFromExpr(Jim_Interp *interp, Jim_Obj *exprObjPtr, int *boolPtr)
+{
+    int retcode;
+    jim_wide wideValue;
+    double doubleValue;
+    Jim_Obj *exprResultPtr;
+
+    retcode = Jim_EvalExpression(interp, exprObjPtr, &exprResultPtr);
+    if (retcode != JIM_OK)
+        return retcode;
+    if (JimGetWideNoErr(interp, exprResultPtr, &wideValue) != JIM_OK) {
+        if (Jim_GetDouble(interp, exprResultPtr, &doubleValue) != JIM_OK)
+        {
+            Jim_DecrRefCount(interp, exprResultPtr);
+            return JIM_ERR;
+        } else {
+            Jim_DecrRefCount(interp, exprResultPtr);
+            *boolPtr = doubleValue != 0;
+            return JIM_OK;
+        }
+    }
+    Jim_DecrRefCount(interp, exprResultPtr);
+    *boolPtr = wideValue != 0;
+    return JIM_OK;
+}
+
+/* -----------------------------------------------------------------------------
+ * ScanFormat String Object
+ * ---------------------------------------------------------------------------*/
+
+/* This Jim_Obj will held a parsed representation of a format string passed to
+ * the Jim_ScanString command. For error diagnostics, the scanformat string has
+ * to be parsed in its entirely first and then, if correct, can be used for
+ * scanning. To avoid endless re-parsing, the parsed representation will be
+ * stored in an internal representation and re-used for performance reason. */
+ 
+/* A ScanFmtPartDescr will held the information of /one/ part of the whole
+ * scanformat string. This part will later be used to extract information
+ * out from the string to be parsed by Jim_ScanString */
+ 
+typedef struct ScanFmtPartDescr {
+    char type;         /* Type of conversion (e.g. c, d, f) */
+    char modifier;     /* Modify type (e.g. l - long, h - short */
+    size_t  width;     /* Maximal width of input to be converted */
+    int  pos;          /* -1 - no assign, 0 - natural pos, >0 - XPG3 pos */ 
+    char *arg;         /* Specification of a CHARSET conversion */
+    char *prefix;      /* Prefix to be scanned literally before conversion */
+} ScanFmtPartDescr;
+
+/* The ScanFmtStringObj will held the internal representation of a scanformat
+ * string parsed and separated in part descriptions. Furthermore it contains
+ * the original string representation of the scanformat string to allow for
+ * fast update of the Jim_Obj's string representation part.
+ *
+ * As add-on the internal object representation add some scratch pad area
+ * for usage by Jim_ScanString to avoid endless allocating and freeing of
+ * memory for purpose of string scanning.
+ *
+ * The error member points to a static allocated string in case of a mal-
+ * formed scanformat string or it contains '0' (NULL) in case of a valid
+ * parse representation.
+ *
+ * The whole memory of the internal representation is allocated as a single
+ * area of memory that will be internally separated. So freeing and duplicating
+ * of such an object is cheap */
+
+typedef struct ScanFmtStringObj {
+    jim_wide        size;         /* Size of internal repr in bytes */
+    char            *stringRep;   /* Original string representation */
+    size_t          count;        /* Number of ScanFmtPartDescr contained */
+    size_t          convCount;    /* Number of conversions that will assign */
+    size_t          maxPos;       /* Max position index if XPG3 is used */
+    const char      *error;       /* Ptr to error text (NULL if no error */
+    char            *scratch;     /* Some scratch pad used by Jim_ScanString */
+    ScanFmtPartDescr descr[1];    /* The vector of partial descriptions */
+} ScanFmtStringObj;
+
+
+static void FreeScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *objPtr);
+static void DupScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+static void UpdateStringOfScanFmt(Jim_Obj *objPtr);
+
+static Jim_ObjType scanFmtStringObjType = {
+    "scanformatstring",
+    FreeScanFmtInternalRep,
+    DupScanFmtInternalRep,
+    UpdateStringOfScanFmt,
+    JIM_TYPE_NONE,
+};
+
+void FreeScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    JIM_NOTUSED(interp);
+    Jim_Free((char*)objPtr->internalRep.ptr);
+    objPtr->internalRep.ptr = 0;
+}
+
+void DupScanFmtInternalRep(Jim_Interp *interp, Jim_Obj *srcPtr, Jim_Obj *dupPtr)
+{
+    size_t size = (size_t)((ScanFmtStringObj*)srcPtr->internalRep.ptr)->size;
+    ScanFmtStringObj *newVec = (ScanFmtStringObj*)Jim_Alloc(size);
+
+    JIM_NOTUSED(interp);
+    memcpy(newVec, srcPtr->internalRep.ptr, size);
+    dupPtr->internalRep.ptr = newVec;
+    dupPtr->typePtr = &scanFmtStringObjType;
+}
+
+void UpdateStringOfScanFmt(Jim_Obj *objPtr)
+{
+    char *bytes = ((ScanFmtStringObj*)objPtr->internalRep.ptr)->stringRep;
+
+    objPtr->bytes = Jim_StrDup(bytes);
+    objPtr->length = strlen(bytes);
+}
+
+/* SetScanFmtFromAny will parse a given string and create the internal
+ * representation of the format specification. In case of an error
+ * the error data member of the internal representation will be set
+ * to an descriptive error text and the function will be left with
+ * JIM_ERR to indicate unsucessful parsing (aka. malformed scanformat
+ * specification */
+
+static int SetScanFmtFromAny(Jim_Interp *interp, Jim_Obj *objPtr)
+{
+    ScanFmtStringObj *fmtObj;
+    char *buffer;
+    int maxCount, i, approxSize, lastPos = -1;
+    const char *fmt = objPtr->bytes;
+    int maxFmtLen = objPtr->length;
+    const char *fmtEnd = fmt + maxFmtLen;
+    int curr;
+
+    Jim_FreeIntRep(interp, objPtr);
+    /* Count how many conversions could take place maximally */
+    for (i=0, maxCount=0; i < maxFmtLen; ++i)
+        if (fmt[i] == '%')
+            ++maxCount;
+    /* Calculate an approximation of the memory necessary */
+    approxSize = sizeof(ScanFmtStringObj)           /* Size of the container */
+        + (maxCount + 1) * sizeof(ScanFmtPartDescr) /* Size of all partials */
+        + maxFmtLen * sizeof(char) + 3 + 1          /* Scratch + "%n" + '\0' */
+        + maxFmtLen * sizeof(char) + 1              /* Original stringrep */
+        + maxFmtLen * sizeof(char)                  /* Arg for CHARSETs */
+        + (maxCount +1) * sizeof(char)              /* '\0' for every partial */
+        + 1;                                        /* safety byte */
+    fmtObj = (ScanFmtStringObj*)Jim_Alloc(approxSize);
+    memset(fmtObj, 0, approxSize);
+    fmtObj->size = approxSize;
+    fmtObj->maxPos = 0;
+    fmtObj->scratch = (char*)&fmtObj->descr[maxCount+1];
+    fmtObj->stringRep = fmtObj->scratch + maxFmtLen + 3 + 1;
+    memcpy(fmtObj->stringRep, fmt, maxFmtLen);
+    buffer = fmtObj->stringRep + maxFmtLen + 1;
+    objPtr->internalRep.ptr = fmtObj;
+    objPtr->typePtr = &scanFmtStringObjType;
+    for (i=0, curr=0; fmt < fmtEnd; ++fmt) {
+        int width=0, skip;
+        ScanFmtPartDescr *descr = &fmtObj->descr[curr];
+        fmtObj->count++;
+        descr->width = 0;                   /* Assume width unspecified */ 
+        /* Overread and store any "literal" prefix */
+        if (*fmt != '%' || fmt[1] == '%') {
+            descr->type = 0;
+            descr->prefix = &buffer[i];
+            for (; fmt < fmtEnd; ++fmt) {
+                if (*fmt == '%') {
+                    if (fmt[1] != '%') break;
+                    ++fmt;
+                }
+                buffer[i++] = *fmt;
+            }
+            buffer[i++] = 0;
+        } 
+        /* Skip the conversion introducing '%' sign */
+        ++fmt;      
+        /* End reached due to non-conversion literal only? */
+        if (fmt >= fmtEnd)
+            goto done;
+        descr->pos = 0;                     /* Assume "natural" positioning */
+        if (*fmt == '*') {
+            descr->pos = -1;       /* Okay, conversion will not be assigned */
+            ++fmt;
+        } else
+            fmtObj->convCount++;    /* Otherwise count as assign-conversion */
+        /* Check if next token is a number (could be width or pos */
+        if (sscanf(fmt, "%d%n", &width, &skip) == 1) {
+            fmt += skip;
+            /* Was the number a XPG3 position specifier? */
+            if (descr->pos != -1 && *fmt == '$') {
+                int prev;
+                ++fmt;
+                descr->pos = width;
+                width = 0;
+                /* Look if "natural" postioning and XPG3 one was mixed */
+                if ((lastPos == 0 && descr->pos > 0)
+                        || (lastPos > 0 && descr->pos == 0)) {
+                    fmtObj->error = "cannot mix \"%\" and \"%n$\" conversion specifiers";
+                    return JIM_ERR;
+                }
+                /* Look if this position was already used */
+                for (prev=0; prev < curr; ++prev) {
+                    if (fmtObj->descr[prev].pos == -1) continue;
+                    if (fmtObj->descr[prev].pos == descr->pos) {
+                        fmtObj->error = "same \"%n$\" conversion specifier "
+                            "used more than once";
+                        return JIM_ERR;
+                    }
+                }
+                /* Try to find a width after the XPG3 specifier */
+                if (sscanf(fmt, "%d%n", &width, &skip) == 1) {
+                    descr->width = width;
+                    fmt += skip;
+                }
+                if (descr->pos > 0 && (size_t)descr->pos > fmtObj->maxPos)
+                    fmtObj->maxPos = descr->pos;
+            } else {
+                /* Number was not a XPG3, so it has to be a width */
+                descr->width = width;
+            }
+        }
+        /* If positioning mode was undetermined yet, fix this */
+        if (lastPos == -1)
+            lastPos = descr->pos;
+        /* Handle CHARSET conversion type ... */
+        if (*fmt == '[') {
+            int swapped = 1, beg = i, end, j;
+            descr->type = '[';
+            descr->arg = &buffer[i];
+            ++fmt;
+            if (*fmt == '^') buffer[i++] = *fmt++;
+            if (*fmt == ']') buffer[i++] = *fmt++;
+            while (*fmt && *fmt != ']') buffer[i++] = *fmt++;
+            if (*fmt != ']') {
+                fmtObj->error = "unmatched [ in format string";
+                return JIM_ERR;
+            } 
+            end = i;
+            buffer[i++] = 0;
+            /* In case a range fence was given "backwards", swap it */
+            while (swapped) {
+                swapped = 0;
+                for (j=beg+1; j < end-1; ++j) {
+                    if (buffer[j] == '-' && buffer[j-1] > buffer[j+1]) {
+                        char tmp = buffer[j-1];
+                        buffer[j-1] = buffer[j+1];
+                        buffer[j+1] = tmp;
+                        swapped = 1;
+                    }
+                }
+            }
+        } else {
+            /* Remember any valid modifier if given */
+            if (strchr("hlL", *fmt) != 0)
+                descr->modifier = tolower((int)*fmt++);
+            
+            descr->type = *fmt;
+            if (strchr("efgcsndoxui", *fmt) == 0) {
+                fmtObj->error = "bad scan conversion character";
+                return JIM_ERR;
+            } else if (*fmt == 'c' && descr->width != 0) {
+                fmtObj->error = "field width may not be specified in %c "
+                    "conversion";
+                return JIM_ERR;
+            } else if (*fmt == 'u' && descr->modifier == 'l') {
+                fmtObj->error = "unsigned wide not supported";
+                return JIM_ERR;
+            }
+        }
+        curr++;
+    }
+done:
+    if (fmtObj->convCount == 0) {
+        fmtObj->error = "no any conversion specifier given";
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* Some accessor macros to allow lowlevel access to fields of internal repr */
+
+#define FormatGetCnvCount(_fo_) \
+    ((ScanFmtStringObj*)((_fo_)->internalRep.ptr))->convCount
+#define FormatGetMaxPos(_fo_) \
+    ((ScanFmtStringObj*)((_fo_)->internalRep.ptr))->maxPos
+#define FormatGetError(_fo_) \
+    ((ScanFmtStringObj*)((_fo_)->internalRep.ptr))->error
+
+/* Some Bit testing/setting/cleaning routines. For now only used in handling
+ * charsets ([a-z123]) within scanning. Later on perhaps a base for a 
+ * bitvector implementation in Jim? */ 
+
+static int JimTestBit(const char *bitvec, char ch)
+{
+    div_t pos = div(ch-1, 8);
+    return bitvec[pos.quot] & (1 << pos.rem);
+}
+
+static void JimSetBit(char *bitvec, char ch)
+{
+    div_t pos = div(ch-1, 8);
+    bitvec[pos.quot] |= (1 << pos.rem);
+}
+
+#if 0 /* currently not used */
+static void JimClearBit(char *bitvec, char ch)
+{
+    div_t pos = div(ch-1, 8);
+    bitvec[pos.quot] &= ~(1 << pos.rem);
+}
+#endif
+
+/* JimScanAString is used to scan an unspecified string that ends with
+ * next WS, or a string that is specified via a charset. The charset
+ * is currently implemented in a way to only allow for usage with
+ * ASCII. Whenever we will switch to UNICODE, another idea has to
+ * be born :-/
+ *
+ * FIXME: Works only with ASCII */
+
+static Jim_Obj *
+JimScanAString(Jim_Interp *interp, const char *sdescr, const char *str)
+{
+    size_t i;
+    Jim_Obj *result;
+    char charset[256/8+1];  /* A Charset may contain max 256 chars */
+    char *buffer = Jim_Alloc(strlen(str)+1), *anchor = buffer;
+
+    /* First init charset to nothing or all, depending if a specified
+     * or an unspecified string has to be parsed */
+    memset(charset, (sdescr ? 0 : 255), sizeof(charset));
+    if (sdescr) {
+        /* There was a set description given, that means we are parsing
+         * a specified string. So we have to build a corresponding 
+         * charset reflecting the description */
+        int notFlag = 0;
+        /* Should the set be negated at the end? */
+        if (*sdescr == '^') {
+            notFlag = 1;
+            ++sdescr;
+        }
+        /* Here '-' is meant literally and not to define a range */
+        if (*sdescr == '-') {
+            JimSetBit(charset, '-');
+            ++sdescr;
+        }
+        while (*sdescr) {
+            if (sdescr[1] == '-' && sdescr[2] != 0) {
+                /* Handle range definitions */
+                int i;
+                for (i=sdescr[0]; i <= sdescr[2]; ++i)
+                    JimSetBit(charset, (char)i);
+                sdescr += 3;
+            } else {
+                /* Handle verbatim character definitions */
+                JimSetBit(charset, *sdescr++);
+            }
+        }
+        /* Negate the charset if there was a NOT given */
+        for (i=0; notFlag && i < sizeof(charset); ++i)
+            charset[i] = ~charset[i];
+    } 
+    /* And after all the mess above, the real work begin ... */
+    while (str && *str) {
+        if (!sdescr && isspace((int)*str))
+            break; /* EOS via WS if unspecified */
+        if (JimTestBit(charset, *str)) *buffer++ = *str++;
+        else break;             /* EOS via mismatch if specified scanning */
+    }
+    *buffer = 0;                /* Close the string properly ... */
+    result = Jim_NewStringObj(interp, anchor, -1);
+    Jim_Free(anchor);           /* ... and free it afer usage */
+    return result;
+}
+
+/* ScanOneEntry will scan one entry out of the string passed as argument.
+ * It use the sscanf() function for this task. After extracting and
+ * converting of the value, the count of scanned characters will be
+ * returned of -1 in case of no conversion tool place and string was
+ * already scanned thru */
+
+static int ScanOneEntry(Jim_Interp *interp, const char *str, long pos,
+        ScanFmtStringObj *fmtObj, long index, Jim_Obj **valObjPtr)
+{
+#   define MAX_SIZE (sizeof(jim_wide) > sizeof(double) \
+        ? sizeof(jim_wide)                             \
+        : sizeof(double))
+    char buffer[MAX_SIZE];
+    char *value = buffer;
+    const char *tok;
+    const ScanFmtPartDescr *descr = &fmtObj->descr[index];
+    size_t sLen = strlen(&str[pos]), scanned = 0;
+    size_t anchor = pos;
+    int i;
+
+    /* First pessimiticly assume, we will not scan anything :-) */
+    *valObjPtr = 0;
+    if (descr->prefix) {
+        /* There was a prefix given before the conversion, skip it and adjust
+         * the string-to-be-parsed accordingly */
+        for (i=0; str[pos] && descr->prefix[i]; ++i) {
+            /* If prefix require, skip WS */
+            if (isspace((int)descr->prefix[i]))
+                while (str[pos] && isspace((int)str[pos])) ++pos;
+            else if (descr->prefix[i] != str[pos]) 
+                break;  /* Prefix do not match here, leave the loop */
+            else
+                ++pos;  /* Prefix matched so far, next round */
+        }
+        if (str[pos] == 0)
+            return -1;  /* All of str consumed: EOF condition */
+        else if (descr->prefix[i] != 0)
+            return 0;   /* Not whole prefix consumed, no conversion possible */
+    }
+    /* For all but following conversion, skip leading WS */
+    if (descr->type != 'c' && descr->type != '[' && descr->type != 'n')
+        while (isspace((int)str[pos])) ++pos;
+    /* Determine how much skipped/scanned so far */
+    scanned = pos - anchor;
+    if (descr->type == 'n') {
+        /* Return pseudo conversion means: how much scanned so far? */
+        *valObjPtr = Jim_NewIntObj(interp, anchor + scanned);
+    } else if (str[pos] == 0) {
+        /* Cannot scan anything, as str is totally consumed */
+        return -1;
+    } else {
+        /* Processing of conversions follows ... */
+        if (descr->width > 0) {
+            /* Do not try to scan as fas as possible but only the given width.
+             * To ensure this, we copy the part that should be scanned. */
+            size_t tLen = descr->width > sLen ? sLen : descr->width;
+            tok = Jim_StrDupLen(&str[pos], tLen);
+        } else {
+            /* As no width was given, simply refer to the original string */
+            tok = &str[pos];
+        }
+        switch (descr->type) {
+            case 'c':
+                *valObjPtr = Jim_NewIntObj(interp, *tok);
+                scanned += 1;
+                break;
+            case 'd': case 'o': case 'x': case 'u': case 'i': {
+                char *endp;  /* Position where the number finished */
+                int base = descr->type == 'o' ? 8
+                    : descr->type == 'x' ? 16
+                    : descr->type == 'i' ? 0
+                    : 10;
+                    
+                do {
+                    /* Try to scan a number with the given base */
+                    if (descr->modifier == 'l')
+#ifdef HAVE_LONG_LONG
+                      *(jim_wide*)value = JimStrtoll(tok, &endp, base);
+#else
+                      *(jim_wide*)value = strtol(tok, &endp, base);
+#endif
+                    else
+                      if (descr->type == 'u')
+                        *(long*)value = strtoul(tok, &endp, base);
+                      else
+                        *(long*)value = strtol(tok, &endp, base);
+                    /* If scanning failed, and base was undetermined, simply
+                     * put it to 10 and try once more. This should catch the
+                     * case where %i begin to parse a number prefix (e.g. 
+                     * '0x' but no further digits follows. This will be
+                     * handled as a ZERO followed by a char 'x' by Tcl */
+                    if (endp == tok && base == 0) base = 10;
+                    else break;
+                } while (1);
+                if (endp != tok) {
+                    /* There was some number sucessfully scanned! */
+                    if (descr->modifier == 'l')
+                        *valObjPtr = Jim_NewIntObj(interp, *(jim_wide*)value);
+                    else
+                        *valObjPtr = Jim_NewIntObj(interp, *(long*)value);
+                    /* Adjust the number-of-chars scanned so far */
+                    scanned += endp - tok;
+                } else {
+                    /* Nothing was scanned. We have to determine if this
+                     * happened due to e.g. prefix mismatch or input str
+                     * exhausted */
+                    scanned = *tok ? 0 : -1;
+                }
+                break;
+            }
+            case 's': case '[': {
+                *valObjPtr = JimScanAString(interp, descr->arg, tok);
+                scanned += Jim_Length(*valObjPtr);
+                break;
+            }
+            case 'e': case 'f': case 'g': {
+                char *endp;
+
+                *(double*)value = strtod(tok, &endp);
+                if (endp != tok) {
+                    /* There was some number sucessfully scanned! */
+                    *valObjPtr = Jim_NewDoubleObj(interp, *(double*)value);
+                    /* Adjust the number-of-chars scanned so far */
+                    scanned += endp - tok;
+                } else {
+                    /* Nothing was scanned. We have to determine if this
+                     * happened due to e.g. prefix mismatch or input str
+                     * exhausted */
+                    scanned = *tok ? 0 : -1;
+                }
+                break;
+            }
+        }
+        /* If a substring was allocated (due to pre-defined width) do not
+         * forget to free it */
+        if (tok != &str[pos])
+            Jim_Free((char*)tok);
+    }
+    return scanned;
+}
+
+/* Jim_ScanString is the workhorse of string scanning. It will scan a given
+ * string and returns all converted (and not ignored) values in a list back
+ * to the caller. If an error occured, a NULL pointer will be returned */
+
+Jim_Obj *Jim_ScanString(Jim_Interp *interp, Jim_Obj *strObjPtr,
+        Jim_Obj *fmtObjPtr, int flags)
+{
+    size_t i, pos;
+    int scanned = 1;
+    const char *str = Jim_GetString(strObjPtr, 0);
+    Jim_Obj *resultList = 0;
+    Jim_Obj **resultVec;
+    int resultc;
+    Jim_Obj *emptyStr = 0;
+    ScanFmtStringObj *fmtObj;
+
+    /* If format specification is not an object, convert it! */
+    if (fmtObjPtr->typePtr != &scanFmtStringObjType)
+        SetScanFmtFromAny(interp, fmtObjPtr);
+    fmtObj = (ScanFmtStringObj*)fmtObjPtr->internalRep.ptr;
+    /* Check if format specification was valid */
+    if (fmtObj->error != 0) {
+        if (flags & JIM_ERRMSG)
+            Jim_SetResultString(interp, fmtObj->error, -1);
+        return 0;
+    }
+    /* Allocate a new "shared" empty string for all unassigned conversions */
+    emptyStr = Jim_NewEmptyStringObj(interp);
+    Jim_IncrRefCount(emptyStr);
+    /* Create a list and fill it with empty strings up to max specified XPG3 */
+    resultList = Jim_NewListObj(interp, 0, 0);
+    if (fmtObj->maxPos > 0) {
+        for (i=0; i < fmtObj->maxPos; ++i)
+            Jim_ListAppendElement(interp, resultList, emptyStr);
+        JimListGetElements(interp, resultList, &resultc, &resultVec);
+    }
+    /* Now handle every partial format description */
+    for (i=0, pos=0; i < fmtObj->count; ++i) {
+        ScanFmtPartDescr *descr = &(fmtObj->descr[i]);
+        Jim_Obj *value = 0;
+        /* Only last type may be "literal" w/o conversion - skip it! */
+        if (descr->type == 0) continue;
+        /* As long as any conversion could be done, we will proceed */
+        if (scanned > 0)
+            scanned = ScanOneEntry(interp, str, pos, fmtObj, i, &value);
+        /* In case our first try results in EOF, we will leave */
+        if (scanned == -1 && i == 0)
+            goto eof;
+        /* Advance next pos-to-be-scanned for the amount scanned already */
+        pos += scanned;
+        /* value == 0 means no conversion took place so take empty string */
+        if (value == 0)
+            value = Jim_NewEmptyStringObj(interp);
+        /* If value is a non-assignable one, skip it */
+        if (descr->pos == -1) {
+            Jim_FreeNewObj(interp, value);
+        } else if (descr->pos == 0)
+            /* Otherwise append it to the result list if no XPG3 was given */
+            Jim_ListAppendElement(interp, resultList, value);
+        else if (resultVec[descr->pos-1] == emptyStr) {
+            /* But due to given XPG3, put the value into the corr. slot */
+            Jim_DecrRefCount(interp, resultVec[descr->pos-1]);
+            Jim_IncrRefCount(value);
+            resultVec[descr->pos-1] = value;
+        } else {
+            /* Otherwise, the slot was already used - free obj and ERROR */
+            Jim_FreeNewObj(interp, value);
+            goto err;
+        }
+    }
+    Jim_DecrRefCount(interp, emptyStr);
+    return resultList;
+eof:
+    Jim_DecrRefCount(interp, emptyStr);
+    Jim_FreeNewObj(interp, resultList);
+    return (Jim_Obj*)EOF;
+err:
+    Jim_DecrRefCount(interp, emptyStr);
+    Jim_FreeNewObj(interp, resultList);
+    return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Pseudo Random Number Generation
+ * ---------------------------------------------------------------------------*/
+static void JimPrngSeed(Jim_Interp *interp, const unsigned char *seed,
+        int seedLen);
+
+/* Initialize the sbox with the numbers from 0 to 255 */
+static void JimPrngInit(Jim_Interp *interp)
+{
+    int i;
+    unsigned int seed[256];
+
+    interp->prngState = Jim_Alloc(sizeof(Jim_PrngState));
+    for (i = 0; i < 256; i++)
+        seed[i] = (rand() ^ time(NULL) ^ clock());
+    JimPrngSeed(interp, (unsigned char*) seed, sizeof(int)*256);
+}
+
+/* Generates N bytes of random data */
+static void JimRandomBytes(Jim_Interp *interp, void *dest, unsigned int len)
+{
+    Jim_PrngState *prng;
+    unsigned char *destByte = (unsigned char*) dest;
+    unsigned int si, sj, x;
+
+    /* initialization, only needed the first time */
+    if (interp->prngState == NULL)
+        JimPrngInit(interp);
+    prng = interp->prngState;
+    /* generates 'len' bytes of pseudo-random numbers */
+    for (x = 0; x < len; x++) {
+        prng->i = (prng->i+1) & 0xff;
+        si = prng->sbox[prng->i];
+        prng->j = (prng->j + si) & 0xff;
+        sj = prng->sbox[prng->j];
+        prng->sbox[prng->i] = sj;
+        prng->sbox[prng->j] = si;
+        *destByte++ = prng->sbox[(si+sj)&0xff];
+    }
+}
+
+/* Re-seed the generator with user-provided bytes */
+static void JimPrngSeed(Jim_Interp *interp, const unsigned char *seed,
+        int seedLen)
+{
+    int i;
+    unsigned char buf[256];
+    Jim_PrngState *prng;
+
+    /* initialization, only needed the first time */
+    if (interp->prngState == NULL)
+        JimPrngInit(interp);
+    prng = interp->prngState;
+
+    /* Set the sbox[i] with i */
+    for (i = 0; i < 256; i++)
+        prng->sbox[i] = i;
+    /* Now use the seed to perform a random permutation of the sbox */
+    for (i = 0; i < seedLen; i++) {
+        unsigned char t;
+
+        t = prng->sbox[i&0xFF];
+        prng->sbox[i&0xFF] = prng->sbox[seed[i]];
+        prng->sbox[seed[i]] = t;
+    }
+    prng->i = prng->j = 0;
+    /* discard the first 256 bytes of stream. */
+    JimRandomBytes(interp, buf, 256);
+}
+
+/* -----------------------------------------------------------------------------
+ * Dynamic libraries support (WIN32 not supported)
+ * ---------------------------------------------------------------------------*/
+
+#ifdef JIM_DYNLIB
+#ifdef WIN32
+#define RTLD_LAZY 0
+void * dlopen(const char *path, int mode) 
+{
+    JIM_NOTUSED(mode);
+
+    return (void *)LoadLibraryA(path);
+}
+int dlclose(void *handle)
+{
+    FreeLibrary((HANDLE)handle);
+    return 0;
+}
+void *dlsym(void *handle, const char *symbol)
+{
+    return GetProcAddress((HMODULE)handle, symbol);
+}
+static char win32_dlerror_string[121];
+const char *dlerror()
+{
+    FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
+                   LANG_NEUTRAL, win32_dlerror_string, 120, NULL);
+    return win32_dlerror_string;
+}
+#endif /* WIN32 */
+
+int Jim_LoadLibrary(Jim_Interp *interp, const char *pathName)
+{
+    Jim_Obj *libPathObjPtr;
+    int prefixc, i;
+    void *handle;
+    int (*onload)(Jim_Interp *interp);
+
+    libPathObjPtr = Jim_GetGlobalVariableStr(interp, "jim_libpath", JIM_NONE);
+    if (libPathObjPtr == NULL) {
+        prefixc = 0;
+        libPathObjPtr = NULL;
+    } else {
+        Jim_IncrRefCount(libPathObjPtr);
+        Jim_ListLength(interp, libPathObjPtr, &prefixc);
+    }
+
+    for (i = -1; i < prefixc; i++) {
+        if (i < 0) {
+            handle = dlopen(pathName, RTLD_LAZY);
+        } else {
+            FILE *fp;
+            char buf[JIM_PATH_LEN];
+            const char *prefix;
+            int prefixlen;
+            Jim_Obj *prefixObjPtr;
+            
+            buf[0] = '\0';
+            if (Jim_ListIndex(interp, libPathObjPtr, i,
+                    &prefixObjPtr, JIM_NONE) != JIM_OK)
+                continue;
+            prefix = Jim_GetString(prefixObjPtr, NULL);
+            prefixlen = strlen(prefix);
+            if (prefixlen+strlen(pathName)+1 >= JIM_PATH_LEN)
+                continue;
+            if (prefixlen && prefix[prefixlen-1] == '/')
+                sprintf(buf, "%s%s", prefix, pathName);
+            else
+                sprintf(buf, "%s/%s", prefix, pathName);
+            printf("opening '%s'\n", buf);
+            fp = fopen(buf, "r");
+            if (fp == NULL)
+                continue;
+            fclose(fp);
+            handle = dlopen(buf, RTLD_LAZY);
+            printf("got handle %p\n", handle);
+        }
+        if (handle == NULL) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "error loading extension \"", pathName,
+                "\": ", dlerror(), NULL);
+            if (i < 0)
+                continue;
+            goto err;
+        }
+        if ((onload = dlsym(handle, "Jim_OnLoad")) == NULL) {
+            Jim_SetResultString(interp,
+                    "No Jim_OnLoad symbol found on extension", -1);
+            goto err;
+        }
+        if (onload(interp) == JIM_ERR) {
+            dlclose(handle);
+            goto err;
+        }
+        Jim_SetEmptyResult(interp);
+        if (libPathObjPtr != NULL)
+            Jim_DecrRefCount(interp, libPathObjPtr);
+        return JIM_OK;
+    }
+err:
+    if (libPathObjPtr != NULL)
+        Jim_DecrRefCount(interp, libPathObjPtr);
+    return JIM_ERR;
+}
+#else /* JIM_DYNLIB */
+int Jim_LoadLibrary(Jim_Interp *interp, const char *pathName)
+{
+    JIM_NOTUSED(interp);
+    JIM_NOTUSED(pathName);
+
+    Jim_SetResultString(interp, "the Jim binary has no support for [load]", -1);
+    return JIM_ERR;
+}
+#endif/* JIM_DYNLIB */
+
+/* -----------------------------------------------------------------------------
+ * Packages handling
+ * ---------------------------------------------------------------------------*/
+
+#define JIM_PKG_ANY_VERSION -1
+
+/* Convert a string of the type "1.2" into an integer.
+ * MAJOR.MINOR is converted as MAJOR*100+MINOR, so "1.2" is converted 
+ * to the integer with value 102 */
+static int JimPackageVersionToInt(Jim_Interp *interp, const char *v,
+        int *intPtr, int flags)
+{
+    char *copy;
+    jim_wide major, minor;
+    char *majorStr, *minorStr, *p;
+
+    if (v[0] == '\0') {
+        *intPtr = JIM_PKG_ANY_VERSION;
+        return JIM_OK;
+    }
+
+    copy = Jim_StrDup(v);
+    p = strchr(copy, '.');
+    if (p == NULL) goto badfmt;
+    *p = '\0';
+    majorStr = copy;
+    minorStr = p+1;
+
+    if (Jim_StringToWide(majorStr, &major, 10) != JIM_OK ||
+        Jim_StringToWide(minorStr, &minor, 10) != JIM_OK)
+        goto badfmt;
+    *intPtr = (int)(major*100+minor);
+    Jim_Free(copy);
+    return JIM_OK;
+
+badfmt:
+    Jim_Free(copy);
+    if (flags & JIM_ERRMSG) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "invalid package version '", v, "'", NULL);
+    }
+    return JIM_ERR;
+}
+
+#define JIM_MATCHVER_EXACT (1<<JIM_PRIV_FLAG_SHIFT)
+static int JimPackageMatchVersion(int needed, int actual, int flags)
+{
+    if (needed == JIM_PKG_ANY_VERSION) return 1;
+    if (flags & JIM_MATCHVER_EXACT) {
+        return needed == actual;
+    } else {
+        return needed/100 == actual/100 && (needed <= actual);
+    }
+}
+
+int Jim_PackageProvide(Jim_Interp *interp, const char *name, const char *ver,
+        int flags)
+{
+    int intVersion;
+    /* Check if the version format is ok */
+    if (JimPackageVersionToInt(interp, ver, &intVersion, JIM_ERRMSG) != JIM_OK)
+        return JIM_ERR;
+    /* If the package was already provided returns an error. */
+    if (Jim_FindHashEntry(&interp->packages, name) != NULL) {
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "package '", name, "' was already provided", NULL);
+        }
+        return JIM_ERR;
+    }
+    Jim_AddHashEntry(&interp->packages, name, (char*) ver);
+    return JIM_OK;
+}
+
+#ifndef JIM_ANSIC
+
+#ifndef WIN32
+# include <sys/types.h>
+# include <dirent.h>
+#else
+# include <io.h>
+/* Posix dirent.h compatiblity layer for WIN32.
+ * Copyright Kevlin Henney, 1997, 2003. All rights reserved.
+ * Copyright Salvatore Sanfilippo ,2005.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose is hereby granted without fee, provided
+ * that this copyright and permissions notice appear in all copies and
+ * derivatives.
+ *
+ * This software is supplied "as is" without express or implied warranty.
+ * This software was modified by Salvatore Sanfilippo for the Jim Interpreter.
+ */
+
+struct dirent {
+    char *d_name;
+};
+
+typedef struct DIR {
+    long                handle; /* -1 for failed rewind */
+    struct _finddata_t  info;
+    struct dirent       result; /* d_name null iff first time */
+    char                *name;  /* null-terminated char string */
+} DIR;
+
+DIR *opendir(const char *name)
+{
+    DIR *dir = 0;
+
+    if(name && name[0]) {
+        size_t base_length = strlen(name);
+        const char *all = /* search pattern must end with suitable wildcard */
+            strchr("/\\", name[base_length - 1]) ? "*" : "/*";
+
+        if((dir = (DIR *) Jim_Alloc(sizeof *dir)) != 0 &&
+           (dir->name = (char *) Jim_Alloc(base_length + strlen(all) + 1)) != 0)
+        {
+            strcat(strcpy(dir->name, name), all);
+
+            if((dir->handle = (long) _findfirst(dir->name, &dir->info)) != -1)
+                dir->result.d_name = 0;
+            else { /* rollback */
+                Jim_Free(dir->name);
+                Jim_Free(dir);
+                dir = 0;
+            }
+        } else { /* rollback */
+            Jim_Free(dir);
+            dir   = 0;
+            errno = ENOMEM;
+        }
+    } else {
+        errno = EINVAL;
+    }
+    return dir;
+}
+
+int closedir(DIR *dir)
+{
+    int result = -1;
+
+    if(dir) {
+        if(dir->handle != -1)
+            result = _findclose(dir->handle);
+        Jim_Free(dir->name);
+        Jim_Free(dir);
+    }
+    if(result == -1) /* map all errors to EBADF */
+        errno = EBADF;
+    return result;
+}
+
+struct dirent *readdir(DIR *dir)
+{
+    struct dirent *result = 0;
+
+    if(dir && dir->handle != -1) {
+        if(!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1) {
+            result         = &dir->result;
+            result->d_name = dir->info.name;
+        }
+    } else {
+        errno = EBADF;
+    }
+    return result;
+}
+
+#endif /* WIN32 */
+
+static char *JimFindBestPackage(Jim_Interp *interp, char **prefixes,
+        int prefixc, const char *pkgName, int pkgVer, int flags)
+{
+    int bestVer = -1, i;
+    int pkgNameLen = strlen(pkgName);
+    char *bestPackage = NULL;
+    struct dirent *de;
+
+    for (i = 0; i < prefixc; i++) {
+        DIR *dir;
+        char buf[JIM_PATH_LEN];
+        int prefixLen;
+
+        if (prefixes[i] == NULL) continue;
+        strncpy(buf, prefixes[i], JIM_PATH_LEN);
+        buf[JIM_PATH_LEN-1] = '\0';
+        prefixLen = strlen(buf);
+        if (prefixLen && buf[prefixLen-1] == '/')
+            buf[prefixLen-1] = '\0';
+
+        if ((dir = opendir(buf)) == NULL) continue;
+        while ((de = readdir(dir)) != NULL) {
+            char *fileName = de->d_name;
+            int fileNameLen = strlen(fileName);
+
+            if (strncmp(fileName, "jim-", 4) == 0 &&
+                strncmp(fileName+4, pkgName, pkgNameLen) == 0 &&
+                *(fileName+4+pkgNameLen) == '-' &&
+                fileNameLen > 4 && /* note that this is not really useful */
+                (strncmp(fileName+fileNameLen-4, ".tcl", 4) == 0 ||
+                 strncmp(fileName+fileNameLen-4, ".dll", 4) == 0 ||
+                 strncmp(fileName+fileNameLen-3, ".so", 3) == 0))
+            {
+                char ver[6]; /* xx.yy<nulterm> */
+                char *p = strrchr(fileName, '.');
+                int verLen, fileVer;
+
+                verLen = p - (fileName+4+pkgNameLen+1);
+                if (verLen < 3 || verLen > 5) continue;
+                memcpy(ver, fileName+4+pkgNameLen+1, verLen);
+                ver[verLen] = '\0';
+                if (JimPackageVersionToInt(interp, ver, &fileVer, JIM_NONE)
+                        != JIM_OK) continue;
+                if (JimPackageMatchVersion(pkgVer, fileVer, flags) &&
+                    (bestVer == -1 || bestVer < fileVer))
+                {
+                    bestVer = fileVer;
+                    Jim_Free(bestPackage);
+                    bestPackage = Jim_Alloc(strlen(buf)+strlen(fileName)+2);
+                    sprintf(bestPackage, "%s/%s", buf, fileName);
+                }
+            }
+        }
+        closedir(dir);
+    }
+    return bestPackage;
+}
+
+#else /* JIM_ANSIC */
+
+static char *JimFindBestPackage(Jim_Interp *interp, char **prefixes,
+        int prefixc, const char *pkgName, int pkgVer, int flags)
+{
+    JIM_NOTUSED(interp);
+    JIM_NOTUSED(prefixes);
+    JIM_NOTUSED(prefixc);
+    JIM_NOTUSED(pkgName);
+    JIM_NOTUSED(pkgVer);
+    JIM_NOTUSED(flags);
+    return NULL;
+}
+
+#endif /* JIM_ANSIC */
+
+/* Search for a suitable package under every dir specified by jim_libpath
+ * and load it if possible. If a suitable package was loaded with success
+ * JIM_OK is returned, otherwise JIM_ERR is returned. */
+static int JimLoadPackage(Jim_Interp *interp, const char *name, int ver,
+        int flags)
+{
+    Jim_Obj *libPathObjPtr;
+    char **prefixes, *best;
+    int prefixc, i, retCode = JIM_OK;
+
+    libPathObjPtr = Jim_GetGlobalVariableStr(interp, "jim_libpath", JIM_NONE);
+    if (libPathObjPtr == NULL) {
+        prefixc = 0;
+        libPathObjPtr = NULL;
+    } else {
+        Jim_IncrRefCount(libPathObjPtr);
+        Jim_ListLength(interp, libPathObjPtr, &prefixc);
+    }
+
+    prefixes = Jim_Alloc(sizeof(char*)*prefixc);
+    for (i = 0; i < prefixc; i++) {
+            Jim_Obj *prefixObjPtr;
+            if (Jim_ListIndex(interp, libPathObjPtr, i,
+                    &prefixObjPtr, JIM_NONE) != JIM_OK)
+            {
+                prefixes[i] = NULL;
+                continue;
+            }
+            prefixes[i] = Jim_StrDup(Jim_GetString(prefixObjPtr, NULL));
+    }
+    /* Scan every directory to find the "best" package. */
+    best = JimFindBestPackage(interp, prefixes, prefixc, name, ver, flags);
+    if (best != NULL) {
+        char *p = strrchr(best, '.');
+        /* Try to load/source it */
+        if (p && strcmp(p, ".tcl") == 0) {
+            retCode = Jim_EvalFile(interp, best);
+        } else {
+            retCode = Jim_LoadLibrary(interp, best);
+        }
+    } else {
+        retCode = JIM_ERR;
+    }
+    Jim_Free(best);
+    for (i = 0; i < prefixc; i++)
+        Jim_Free(prefixes[i]);
+    Jim_Free(prefixes);
+    if (libPathObjPtr)
+        Jim_DecrRefCount(interp, libPathObjPtr);
+    return retCode;
+}
+
+const char *Jim_PackageRequire(Jim_Interp *interp, const char *name,
+        const char *ver, int flags)
+{
+    Jim_HashEntry *he;
+    int requiredVer;
+
+    if (JimPackageVersionToInt(interp, ver, &requiredVer, JIM_ERRMSG) != JIM_OK)
+        return NULL;
+    he = Jim_FindHashEntry(&interp->packages, name);
+    if (he == NULL) {
+        /* Try to load the package. */
+        if (JimLoadPackage(interp, name, requiredVer, flags) == JIM_OK) {
+            he = Jim_FindHashEntry(&interp->packages, name);
+            if (he == NULL) {
+                return "?";
+            }
+            return he->val;
+        }
+        /* No way... return an error. */
+        if (flags & JIM_ERRMSG) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "Can't find package '", name, "'", NULL);
+        }
+        return NULL;
+    } else {
+        int actualVer;
+        if (JimPackageVersionToInt(interp, he->val, &actualVer, JIM_ERRMSG)
+                != JIM_OK)
+        {
+            return NULL;
+        }
+        /* Check if version matches. */
+        if (JimPackageMatchVersion(requiredVer, actualVer, flags) == 0) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                    "Package '", name, "' already loaded, but with version ",
+                    he->val, NULL);
+            return NULL;
+        }
+        return he->val;
+    }
+}
+
+/* -----------------------------------------------------------------------------
+ * Eval
+ * ---------------------------------------------------------------------------*/
+#define JIM_EVAL_SARGV_LEN 8 /* static arguments vector length */
+#define JIM_EVAL_SINTV_LEN 8 /* static interpolation vector length */
+
+static int JimCallProcedure(Jim_Interp *interp, Jim_Cmd *cmd, int argc,
+        Jim_Obj *const *argv);
+
+/* Handle calls to the [unknown] command */
+static int JimUnknown(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+    Jim_Obj **v, *sv[JIM_EVAL_SARGV_LEN];
+    int retCode;
+
+    /* If the [unknown] command does not exists returns
+     * just now */
+    if (Jim_GetCommand(interp, interp->unknown, JIM_NONE) == NULL)
+        return JIM_ERR;
+
+    /* The object interp->unknown just contains
+     * the "unknown" string, it is used in order to
+     * avoid to lookup the unknown command every time
+     * but instread to cache the result. */
+    if (argc+1 <= JIM_EVAL_SARGV_LEN)
+        v = sv;
+    else
+        v = Jim_Alloc(sizeof(Jim_Obj*)*(argc+1));
+    /* Make a copy of the arguments vector, but shifted on
+     * the right of one position. The command name of the
+     * command will be instead the first argument of the
+     * [unknonw] call. */
+    memcpy(v+1, argv, sizeof(Jim_Obj*)*argc);
+    v[0] = interp->unknown;
+    /* Call it */
+    retCode = Jim_EvalObjVector(interp, argc+1, v);
+    /* Clean up */
+    if (v != sv)
+        Jim_Free(v);
+    return retCode;
+}
+
+/* Eval the object vector 'objv' composed of 'objc' elements.
+ * Every element is used as single argument.
+ * Jim_EvalObj() will call this function every time its object
+ * argument is of "list" type, with no string representation.
+ *
+ * This is possible because the string representation of a
+ * list object generated by the UpdateStringOfList is made
+ * in a way that ensures that every list element is a different
+ * command argument. */
+int Jim_EvalObjVector(Jim_Interp *interp, int objc, Jim_Obj *const *objv)
+{
+    int i, retcode;
+    Jim_Cmd *cmdPtr;
+
+    /* Incr refcount of arguments. */
+    for (i = 0; i < objc; i++)
+        Jim_IncrRefCount(objv[i]);
+    /* Command lookup */
+    cmdPtr = Jim_GetCommand(interp, objv[0], JIM_ERRMSG);
+    if (cmdPtr == NULL) {
+        retcode = JimUnknown(interp, objc, objv);
+    } else {
+        /* Call it -- Make sure result is an empty object. */
+        Jim_SetEmptyResult(interp);
+        if (cmdPtr->cmdProc) {
+            interp->cmdPrivData = cmdPtr->privData;
+            retcode = cmdPtr->cmdProc(interp, objc, objv);
+        } else {
+            retcode = JimCallProcedure(interp, cmdPtr, objc, objv);
+    if (retcode == JIM_ERR) {
+        JimAppendStackTrace(interp,
+            Jim_GetString(objv[0], NULL), "?", 1);
+    }
+        }
+    }
+    /* Decr refcount of arguments and return the retcode */
+    for (i = 0; i < objc; i++)
+        Jim_DecrRefCount(interp, objv[i]);
+    return retcode;
+}
+
+/* Interpolate the given tokens into a unique Jim_Obj returned by reference
+ * via *objPtrPtr. This function is only called by Jim_EvalObj().
+ * The returned object has refcount = 0. */
+int Jim_InterpolateTokens(Jim_Interp *interp, ScriptToken *token,
+        int tokens, Jim_Obj **objPtrPtr)
+{
+    int totlen = 0, i, retcode;
+    Jim_Obj **intv;
+    Jim_Obj *sintv[JIM_EVAL_SINTV_LEN];
+    Jim_Obj *objPtr;
+    char *s;
+
+    if (tokens <= JIM_EVAL_SINTV_LEN)
+        intv = sintv;
+    else
+        intv = Jim_Alloc(sizeof(Jim_Obj*)*
+                tokens);
+    /* Compute every token forming the argument
+     * in the intv objects vector. */
+    for (i = 0; i < tokens; i++) {
+        switch(token[i].type) {
+        case JIM_TT_ESC:
+        case JIM_TT_STR:
+            intv[i] = token[i].objPtr;
+            break;
+        case JIM_TT_VAR:
+            intv[i] = Jim_GetVariable(interp, token[i].objPtr, JIM_ERRMSG);
+            if (!intv[i]) {
+                retcode = JIM_ERR;
+                goto err;
+            }
+            break;
+        case JIM_TT_DICTSUGAR:
+            intv[i] = Jim_ExpandDictSugar(interp, token[i].objPtr);
+            if (!intv[i]) {
+                retcode = JIM_ERR;
+                goto err;
+            }
+            break;
+        case JIM_TT_CMD:
+            retcode = Jim_EvalObj(interp, token[i].objPtr);
+            if (retcode != JIM_OK)
+                goto err;
+            intv[i] = Jim_GetResult(interp);
+            break;
+        default:
+            Jim_Panic(interp,
+              "default token type reached "
+              "in Jim_InterpolateTokens().");
+            break;
+        }
+        Jim_IncrRefCount(intv[i]);
+        /* Make sure there is a valid
+         * string rep, and add the string
+         * length to the total legnth. */
+        Jim_GetString(intv[i], NULL);
+        totlen += intv[i]->length;
+    }
+    /* Concatenate every token in an unique
+     * object. */
+    objPtr = Jim_NewStringObjNoAlloc(interp,
+            NULL, 0);
+    s = objPtr->bytes = Jim_Alloc(totlen+1);
+    objPtr->length = totlen;
+    for (i = 0; i < tokens; i++) {
+        memcpy(s, intv[i]->bytes, intv[i]->length);
+        s += intv[i]->length;
+        Jim_DecrRefCount(interp, intv[i]);
+    }
+    objPtr->bytes[totlen] = '\0';
+    /* Free the intv vector if not static. */
+    if (tokens > JIM_EVAL_SINTV_LEN)
+        Jim_Free(intv);
+    *objPtrPtr = objPtr;
+    return JIM_OK;
+err:
+    i--;
+    for (; i >= 0; i--)
+        Jim_DecrRefCount(interp, intv[i]);
+    if (tokens > JIM_EVAL_SINTV_LEN)
+        Jim_Free(intv);
+    return retcode;
+}
+
+/* Helper of Jim_EvalObj() to perform argument expansion.
+ * Basically this function append an argument to 'argv'
+ * (and increments argc by reference accordingly), performing
+ * expansion of the list object if 'expand' is non-zero, or
+ * just adding objPtr to argv if 'expand' is zero. */
+void Jim_ExpandArgument(Jim_Interp *interp, Jim_Obj ***argv,
+        int *argcPtr, int expand, Jim_Obj *objPtr)
+{
+    if (!expand) {
+        (*argv) = Jim_Realloc(*argv, sizeof(Jim_Obj*)*((*argcPtr)+1));
+        /* refcount of objPtr not incremented because
+         * we are actually transfering a reference from
+         * the old 'argv' to the expanded one. */
+        (*argv)[*argcPtr] = objPtr;
+        (*argcPtr)++;
+    } else {
+        int len, i;
+
+        Jim_ListLength(interp, objPtr, &len);
+        (*argv) = Jim_Realloc(*argv, sizeof(Jim_Obj*)*((*argcPtr)+len));
+        for (i = 0; i < len; i++) {
+            (*argv)[*argcPtr] = objPtr->internalRep.listValue.ele[i];
+            Jim_IncrRefCount(objPtr->internalRep.listValue.ele[i]);
+            (*argcPtr)++;
+        }
+        /* The original object reference is no longer needed,
+         * after the expansion it is no longer present on
+         * the argument vector, but the single elements are
+         * in its place. */
+        Jim_DecrRefCount(interp, objPtr);
+    }
+}
+
+int Jim_EvalObj(Jim_Interp *interp, Jim_Obj *scriptObjPtr)
+{
+    int i, j = 0, len;
+    ScriptObj *script;
+    ScriptToken *token;
+    int *cs; /* command structure array */
+    int retcode = JIM_OK;
+    Jim_Obj *sargv[JIM_EVAL_SARGV_LEN], **argv = NULL, *tmpObjPtr;
+
+    interp->errorFlag = 0;
+
+    /* If the object is of type "list" and there is no
+     * string representation for this object, we can call
+     * a specialized version of Jim_EvalObj() */
+    if (scriptObjPtr->typePtr == &listObjType &&
+        scriptObjPtr->internalRep.listValue.len &&
+        scriptObjPtr->bytes == NULL) {
+        Jim_IncrRefCount(scriptObjPtr);
+        retcode = Jim_EvalObjVector(interp,
+                scriptObjPtr->internalRep.listValue.len,
+                scriptObjPtr->internalRep.listValue.ele);
+        Jim_DecrRefCount(interp, scriptObjPtr);
+        return retcode;
+    }
+
+    Jim_IncrRefCount(scriptObjPtr); /* Make sure it's shared. */
+    script = Jim_GetScript(interp, scriptObjPtr);
+    /* Now we have to make sure the internal repr will not be
+     * freed on shimmering.
+     *
+     * Think for example to this:
+     *
+     * set x {llength $x; ... some more code ...}; eval $x
+     *
+     * In order to preserve the internal rep, we increment the
+     * inUse field of the script internal rep structure. */
+    script->inUse++;
+
+    token = script->token;
+    len = script->len;
+    cs = script->cmdStruct;
+    i = 0; /* 'i' is the current token index. */
+
+    /* Reset the interpreter result. This is useful to
+     * return the emtpy result in the case of empty program. */
+    Jim_SetEmptyResult(interp);
+
+    /* Execute every command sequentially, returns on
+     * error (i.e. if a command does not return JIM_OK) */
+    while (i < len) {
+        int expand = 0;
+        int argc = *cs++; /* Get the number of arguments */
+        Jim_Cmd *cmd;
+
+        /* Set the expand flag if needed. */
+        if (argc == -1) {
+            expand++;
+            argc = *cs++;
+        }
+        /* Allocate the arguments vector */
+        if (argc <= JIM_EVAL_SARGV_LEN)
+            argv = sargv;
+        else
+            argv = Jim_Alloc(sizeof(Jim_Obj*)*argc);
+        /* Populate the arguments objects. */
+        for (j = 0; j < argc; j++) {
+            int tokens = *cs++;
+
+            /* tokens is negative if expansion is needed.
+             * for this argument. */
+            if (tokens < 0) {
+                tokens = (-tokens)-1;
+                i++;
+            }
+            if (tokens == 1) {
+                /* Fast path if the token does not
+                 * need interpolation */
+                switch(token[i].type) {
+                case JIM_TT_ESC:
+                case JIM_TT_STR:
+                    argv[j] = token[i].objPtr;
+                    break;
+                case JIM_TT_VAR:
+                    tmpObjPtr = Jim_GetVariable(interp, token[i].objPtr,
+                            JIM_ERRMSG);
+                    if (!tmpObjPtr) {
+                        retcode = JIM_ERR;
+                        goto err;
+                    }
+                    argv[j] = tmpObjPtr;
+                    break;
+                case JIM_TT_DICTSUGAR:
+                    tmpObjPtr = Jim_ExpandDictSugar(interp, token[i].objPtr);
+                    if (!tmpObjPtr) {
+                        retcode = JIM_ERR;
+                        goto err;
+                    }
+                    argv[j] = tmpObjPtr;
+                    break;
+                case JIM_TT_CMD:
+                    retcode = Jim_EvalObj(interp, token[i].objPtr);
+                    if (retcode != JIM_OK)
+                        goto err;
+                    argv[j] = Jim_GetResult(interp);
+                    break;
+                default:
+                    Jim_Panic(interp,
+                      "default token type reached "
+                      "in Jim_EvalObj().");
+                    break;
+                }
+                Jim_IncrRefCount(argv[j]);
+                i += 2;
+            } else {
+                /* For interpolation we call an helper
+                 * function doing the work for us. */
+                if ((retcode = Jim_InterpolateTokens(interp,
+                        token+i, tokens, &tmpObjPtr)) != JIM_OK)
+                {
+                    goto err;
+                }
+                argv[j] = tmpObjPtr;
+                Jim_IncrRefCount(argv[j]);
+                i += tokens+1;
+            }
+        }
+        /* Handle {expand} expansion */
+        if (expand) {
+            int *ecs = cs - argc;
+            int eargc = 0;
+            Jim_Obj **eargv = NULL;
+
+            for (j = 0; j < argc; j++) {
+                Jim_ExpandArgument( interp, &eargv, &eargc,
+                        ecs[j] < 0, argv[j]);
+            }
+            if (argv != sargv)
+                Jim_Free(argv);
+            argc = eargc;
+            argv = eargv;
+            j = argc;
+            if (argc == 0) {
+                /* Nothing to do with zero args. */
+                Jim_Free(eargv);
+                continue;
+            }
+        }
+        /* Lookup the command to call */
+        cmd = Jim_GetCommand(interp, argv[0], JIM_ERRMSG);
+        if (cmd != NULL) {
+            /* Call it -- Make sure result is an empty object. */
+            Jim_SetEmptyResult(interp);
+            if (cmd->cmdProc) {
+                interp->cmdPrivData = cmd->privData;
+                retcode = cmd->cmdProc(interp, argc, argv);
+            } else {
+                retcode = JimCallProcedure(interp, cmd, argc, argv);
+                if (retcode == JIM_ERR) {
+                    JimAppendStackTrace(interp,
+                        Jim_GetString(argv[0], NULL), script->fileName,
+                        token[i-argc*2].linenr);
+                }
+            }
+        } else {
+            /* Call [unknown] */
+            retcode = JimUnknown(interp, argc, argv);
+            if (retcode == JIM_ERR) {
+                JimAppendStackTrace(interp,
+                    Jim_GetString(argv[0], NULL), script->fileName,
+                    token[i-argc*2].linenr);
+            }
+        }
+        if (retcode != JIM_OK) {
+            i -= argc*2; /* point to the command name. */
+            goto err;
+        }
+        /* Decrement the arguments count */
+        for (j = 0; j < argc; j++) {
+            Jim_DecrRefCount(interp, argv[j]);
+        }
+
+        if (argv != sargv) {
+            Jim_Free(argv);
+            argv = NULL;
+        }
+    }
+    /* Note that we don't have to decrement inUse, because the
+     * following code transfers our use of the reference again to
+     * the script object. */
+    j = 0; /* on normal termination, the argv array is already
+          Jim_DecrRefCount-ed. */
+err:
+    /* Handle errors. */
+    if (retcode == JIM_ERR && !interp->errorFlag) {
+        interp->errorFlag = 1;
+        JimSetErrorFileName(interp, script->fileName);
+        JimSetErrorLineNumber(interp, token[i].linenr);
+        JimResetStackTrace(interp);
+    }
+    Jim_FreeIntRep(interp, scriptObjPtr);
+    scriptObjPtr->typePtr = &scriptObjType;
+    Jim_SetIntRepPtr(scriptObjPtr, script);
+    Jim_DecrRefCount(interp, scriptObjPtr);
+    for (i = 0; i < j; i++) {
+        Jim_DecrRefCount(interp, argv[i]);
+    }
+    if (argv != sargv)
+        Jim_Free(argv);
+    return retcode;
+}
+
+/* Call a procedure implemented in Tcl.
+ * It's possible to speed-up a lot this function, currently
+ * the callframes are not cached, but allocated and
+ * destroied every time. What is expecially costly is
+ * to create/destroy the local vars hash table every time.
+ *
+ * This can be fixed just implementing callframes caching
+ * in JimCreateCallFrame() and JimFreeCallFrame(). */
+int JimCallProcedure(Jim_Interp *interp, Jim_Cmd *cmd, int argc,
+        Jim_Obj *const *argv)
+{
+    int i, retcode;
+    Jim_CallFrame *callFramePtr;
+
+    /* Check arity */
+    if (argc < cmd->arityMin || (cmd->arityMax != -1 &&
+        argc > cmd->arityMax)) {
+        Jim_Obj *objPtr = Jim_NewEmptyStringObj(interp);
+        Jim_AppendStrings(interp, objPtr,
+            "wrong # args: should be \"", Jim_GetString(argv[0], NULL),
+            (cmd->arityMin > 1) ? " " : "",
+            Jim_GetString(cmd->argListObjPtr, NULL), "\"", NULL);
+        Jim_SetResult(interp, objPtr);
+        return JIM_ERR;
+    }
+    /* Check if there are too nested calls */
+    if (interp->numLevels == interp->maxNestingDepth) {
+        Jim_SetResultString(interp,
+            "Too many nested calls. Infinite recursion?", -1);
+        return JIM_ERR;
+    }
+    /* Create a new callframe */
+    callFramePtr = JimCreateCallFrame(interp);
+    callFramePtr->parentCallFrame = interp->framePtr;
+    callFramePtr->argv = argv;
+    callFramePtr->argc = argc;
+    callFramePtr->procArgsObjPtr = cmd->argListObjPtr;
+    callFramePtr->procBodyObjPtr = cmd->bodyObjPtr;
+    callFramePtr->staticVars = cmd->staticVars;
+    Jim_IncrRefCount(cmd->argListObjPtr);
+    Jim_IncrRefCount(cmd->bodyObjPtr);
+    interp->framePtr = callFramePtr;
+    interp->numLevels ++;
+    /* Set arguments */
+    for (i = 0; i < cmd->arityMin-1; i++) {
+        Jim_Obj *objPtr;
+
+        Jim_ListIndex(interp, cmd->argListObjPtr, i, &objPtr, JIM_NONE);
+        Jim_SetVariable(interp, objPtr, argv[i+1]);
+    }
+    if (cmd->arityMax == -1) {
+        Jim_Obj *listObjPtr, *objPtr;
+
+        listObjPtr = Jim_NewListObj(interp, argv+cmd->arityMin,
+                argc-cmd->arityMin);
+        Jim_ListIndex(interp, cmd->argListObjPtr, i, &objPtr, JIM_NONE);
+        Jim_SetVariable(interp, objPtr, listObjPtr);
+    }
+    /* Eval the body */
+    retcode = Jim_EvalObj(interp, cmd->bodyObjPtr);
+
+    /* Destroy the callframe */
+    interp->numLevels --;
+    interp->framePtr = interp->framePtr->parentCallFrame;
+    if (callFramePtr->vars.size != JIM_HT_INITIAL_SIZE) {
+        JimFreeCallFrame(interp, callFramePtr, JIM_FCF_NONE);
+    } else {
+        JimFreeCallFrame(interp, callFramePtr, JIM_FCF_NOHT);
+    }
+    /* Handle the JIM_EVAL return code */
+    if (retcode == JIM_EVAL && interp->evalRetcodeLevel != interp->numLevels) {
+        int savedLevel = interp->evalRetcodeLevel;
+
+        interp->evalRetcodeLevel = interp->numLevels;
+        while (retcode == JIM_EVAL) {
+            Jim_Obj *resultScriptObjPtr = Jim_GetResult(interp);
+            Jim_IncrRefCount(resultScriptObjPtr);
+            retcode = Jim_EvalObj(interp, resultScriptObjPtr);
+            Jim_DecrRefCount(interp, resultScriptObjPtr);
+        }
+        interp->evalRetcodeLevel = savedLevel;
+    }
+    /* Handle the JIM_RETURN return code */
+    if (retcode == JIM_RETURN) {
+        retcode = interp->returnCode;
+        interp->returnCode = JIM_OK;
+    }
+    return retcode;
+}
+
+int Jim_Eval(Jim_Interp *interp, const char *script)
+{
+    Jim_Obj *scriptObjPtr = Jim_NewStringObj(interp, script, -1);
+    int retval;
+
+    Jim_IncrRefCount(scriptObjPtr);
+    retval = Jim_EvalObj(interp, scriptObjPtr);
+    Jim_DecrRefCount(interp, scriptObjPtr);
+    return retval;
+}
+
+/* Execute script in the scope of the global level */
+int Jim_EvalGlobal(Jim_Interp *interp, const char *script)
+{
+    Jim_CallFrame *savedFramePtr;
+    int retval;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    retval = Jim_Eval(interp, script);
+    interp->framePtr = savedFramePtr;
+    return retval;
+}
+
+int Jim_EvalObjBackground(Jim_Interp *interp, Jim_Obj *scriptObjPtr)
+{
+    Jim_CallFrame *savedFramePtr;
+    int retval;
+
+    savedFramePtr = interp->framePtr;
+    interp->framePtr = interp->topFramePtr;
+    retval = Jim_EvalObj(interp, scriptObjPtr);
+    interp->framePtr = savedFramePtr;
+    /* Try to report the error (if any) via the bgerror proc */
+    if (retval != JIM_OK) {
+        Jim_Obj *objv[2];
+
+        objv[0] = Jim_NewStringObj(interp, "bgerror", -1);
+        objv[1] = Jim_GetResult(interp);
+        Jim_IncrRefCount(objv[0]);
+        Jim_IncrRefCount(objv[1]);
+        if (Jim_EvalObjVector(interp, 2, objv) != JIM_OK) {
+            /* Report the error to stderr. */
+            Jim_fprintf( interp, interp->cookie_stderr, "Background error:" JIM_NL);
+            Jim_PrintErrorMessage(interp);
+        }
+        Jim_DecrRefCount(interp, objv[0]);
+        Jim_DecrRefCount(interp, objv[1]);
+    }
+    return retval;
+}
+
+int Jim_EvalFile(Jim_Interp *interp, const char *filename)
+{
+    char *prg = NULL;
+    FILE *fp;
+    int nread, totread, maxlen, buflen;
+    int retval;
+    Jim_Obj *scriptObjPtr;
+    
+    if ((fp = fopen(filename, "r")) == NULL) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "Error loading script \"", filename, "\": ",
+            strerror(errno), NULL);
+        return JIM_ERR;
+    }
+    buflen = 1024;
+    maxlen = totread = 0;
+    while (1) {
+        if (maxlen < totread+buflen+1) {
+            maxlen = totread+buflen+1;
+            prg = Jim_Realloc(prg, maxlen);
+        }
+		/* do not use Jim_fread() - this is really a file */
+        if ((nread = fread(prg+totread, 1, buflen, fp)) == 0) break;
+        totread += nread;
+    }
+    prg[totread] = '\0';
+	/* do not use Jim_fclose() - this is really a file */
+    fclose(fp);
+
+    scriptObjPtr = Jim_NewStringObjNoAlloc(interp, prg, totread);
+    JimSetSourceInfo(interp, scriptObjPtr, filename, 1);
+    Jim_IncrRefCount(scriptObjPtr);
+    retval = Jim_EvalObj(interp, scriptObjPtr);
+    Jim_DecrRefCount(interp, scriptObjPtr);
+    return retval;
+}
+
+/* -----------------------------------------------------------------------------
+ * Subst
+ * ---------------------------------------------------------------------------*/
+static int JimParseSubstStr(struct JimParserCtx *pc)
+{
+    pc->tstart = pc->p;
+    pc->tline = pc->linenr;
+    while (*pc->p && *pc->p != '$' && *pc->p != '[') {
+        pc->p++; pc->len--;
+    }
+    pc->tend = pc->p-1;
+    pc->tt = JIM_TT_ESC;
+    return JIM_OK;
+}
+
+static int JimParseSubst(struct JimParserCtx *pc, int flags)
+{
+    int retval;
+
+    if (pc->len == 0) {
+        pc->tstart = pc->tend = pc->p;
+        pc->tline = pc->linenr;
+        pc->tt = JIM_TT_EOL;
+        pc->eof = 1;
+        return JIM_OK;
+    }
+    switch(*pc->p) {
+    case '[':
+        retval = JimParseCmd(pc);
+        if (flags & JIM_SUBST_NOCMD) {
+            pc->tstart--;
+            pc->tend++;
+            pc->tt = (flags & JIM_SUBST_NOESC) ?
+                JIM_TT_STR : JIM_TT_ESC;
+        }
+        return retval;
+        break;
+    case '$':
+        if (JimParseVar(pc) == JIM_ERR) {
+            pc->tstart = pc->tend = pc->p++; pc->len--;
+            pc->tline = pc->linenr;
+            pc->tt = JIM_TT_STR;
+        } else {
+            if (flags & JIM_SUBST_NOVAR) {
+                pc->tstart--;
+                if (flags & JIM_SUBST_NOESC)
+                    pc->tt = JIM_TT_STR;
+                else
+                    pc->tt = JIM_TT_ESC;
+                if (*pc->tstart == '{') {
+                    pc->tstart--;
+                    if (*(pc->tend+1))
+                        pc->tend++;
+                }
+            }
+        }
+        break;
+    default:
+        retval = JimParseSubstStr(pc);
+        if (flags & JIM_SUBST_NOESC)
+            pc->tt = JIM_TT_STR;
+        return retval;
+        break;
+    }
+    return JIM_OK;
+}
+
+/* The subst object type reuses most of the data structures and functions
+ * of the script object. Script's data structures are a bit more complex
+ * for what is needed for [subst]itution tasks, but the reuse helps to
+ * deal with a single data structure at the cost of some more memory
+ * usage for substitutions. */
+static Jim_ObjType substObjType = {
+    "subst",
+    FreeScriptInternalRep,
+    DupScriptInternalRep,
+    NULL,
+    JIM_TYPE_REFERENCES,
+};
+
+/* This method takes the string representation of an object
+ * as a Tcl string where to perform [subst]itution, and generates
+ * the pre-parsed internal representation. */
+int SetSubstFromAny(Jim_Interp *interp, struct Jim_Obj *objPtr, int flags)
+{
+    int scriptTextLen;
+    const char *scriptText = Jim_GetString(objPtr, &scriptTextLen);
+    struct JimParserCtx parser;
+    struct ScriptObj *script = Jim_Alloc(sizeof(*script));
+
+    script->len = 0;
+    script->csLen = 0;
+    script->commands = 0;
+    script->token = NULL;
+    script->cmdStruct = NULL;
+    script->inUse = 1;
+    script->substFlags = flags;
+    script->fileName = NULL;
+
+    JimParserInit(&parser, scriptText, scriptTextLen, 1);
+    while(1) {
+        char *token;
+        int len, type, linenr;
+
+        JimParseSubst(&parser, flags);
+        if (JimParserEof(&parser)) break;
+        token = JimParserGetToken(&parser, &len, &type, &linenr);
+        ScriptObjAddToken(interp, script, token, len, type,
+                NULL, linenr);
+    }
+    /* Free the old internal rep and set the new one. */
+    Jim_FreeIntRep(interp, objPtr);
+    Jim_SetIntRepPtr(objPtr, script);
+    objPtr->typePtr = &scriptObjType;
+    return JIM_OK;
+}
+
+ScriptObj *Jim_GetSubst(Jim_Interp *interp, Jim_Obj *objPtr, int flags)
+{
+    struct ScriptObj *script = Jim_GetIntRepPtr(objPtr);
+
+    if (objPtr->typePtr != &substObjType || script->substFlags != flags)
+        SetSubstFromAny(interp, objPtr, flags);
+    return (ScriptObj*) Jim_GetIntRepPtr(objPtr);
+}
+
+/* Performs commands,variables,blackslashes substitution,
+ * storing the result object (with refcount 0) into
+ * resObjPtrPtr. */
+int Jim_SubstObj(Jim_Interp *interp, Jim_Obj *substObjPtr,
+        Jim_Obj **resObjPtrPtr, int flags)
+{
+    ScriptObj *script;
+    ScriptToken *token;
+    int i, len, retcode = JIM_OK;
+    Jim_Obj *resObjPtr, *savedResultObjPtr;
+
+    script = Jim_GetSubst(interp, substObjPtr, flags);
+#ifdef JIM_OPTIMIZATION
+    /* Fast path for a very common case with array-alike syntax,
+     * that's: $foo($bar) */
+    if (script->len == 1 && script->token[0].type == JIM_TT_VAR) {
+        Jim_Obj *varObjPtr = script->token[0].objPtr;
+        
+        Jim_IncrRefCount(varObjPtr);
+        resObjPtr = Jim_GetVariable(interp, varObjPtr, JIM_ERRMSG);
+        if (resObjPtr == NULL) {
+            Jim_DecrRefCount(interp, varObjPtr);
+            return JIM_ERR;
+        }
+        Jim_DecrRefCount(interp, varObjPtr);
+        *resObjPtrPtr = resObjPtr;
+        return JIM_OK;
+    }
+#endif
+
+    Jim_IncrRefCount(substObjPtr); /* Make sure it's shared. */
+    /* In order to preserve the internal rep, we increment the
+     * inUse field of the script internal rep structure. */
+    script->inUse++;
+
+    token = script->token;
+    len = script->len;
+
+    /* Save the interp old result, to set it again before
+     * to return. */
+    savedResultObjPtr = interp->result;
+    Jim_IncrRefCount(savedResultObjPtr);
+    
+    /* Perform the substitution. Starts with an empty object
+     * and adds every token (performing the appropriate
+     * var/command/escape substitution). */
+    resObjPtr = Jim_NewStringObj(interp, "", 0);
+    for (i = 0; i < len; i++) {
+        Jim_Obj *objPtr;
+
+        switch(token[i].type) {
+        case JIM_TT_STR:
+        case JIM_TT_ESC:
+            Jim_AppendObj(interp, resObjPtr, token[i].objPtr);
+            break;
+        case JIM_TT_VAR:
+            objPtr = Jim_GetVariable(interp, token[i].objPtr, JIM_ERRMSG);
+            if (objPtr == NULL) goto err;
+            Jim_IncrRefCount(objPtr);
+            Jim_AppendObj(interp, resObjPtr, objPtr);
+            Jim_DecrRefCount(interp, objPtr);
+            break;
+        case JIM_TT_CMD:
+            if (Jim_EvalObj(interp, token[i].objPtr) != JIM_OK)
+                goto err;
+            Jim_AppendObj(interp, resObjPtr, interp->result);
+            break;
+        default:
+            Jim_Panic(interp,
+              "default token type (%d) reached "
+              "in Jim_SubstObj().", token[i].type);
+            break;
+        }
+    }
+ok:
+    if (retcode == JIM_OK)
+        Jim_SetResult(interp, savedResultObjPtr);
+    Jim_DecrRefCount(interp, savedResultObjPtr);
+    /* Note that we don't have to decrement inUse, because the
+     * following code transfers our use of the reference again to
+     * the script object. */
+    Jim_FreeIntRep(interp, substObjPtr);
+    substObjPtr->typePtr = &scriptObjType;
+    Jim_SetIntRepPtr(substObjPtr, script);
+    Jim_DecrRefCount(interp, substObjPtr);
+    *resObjPtrPtr = resObjPtr;
+    return retcode;
+err:
+    Jim_FreeNewObj(interp, resObjPtr);
+    retcode = JIM_ERR;
+    goto ok;
+}
+
+/* -----------------------------------------------------------------------------
+ * API Input/Export functions
+ * ---------------------------------------------------------------------------*/
+
+int Jim_GetApi(Jim_Interp *interp, const char *funcname, void *targetPtrPtr)
+{
+    Jim_HashEntry *he;
+
+    he = Jim_FindHashEntry(&interp->stub, funcname);
+    if (!he)
+        return JIM_ERR;
+    memcpy(targetPtrPtr, &he->val, sizeof(void*));
+    return JIM_OK;
+}
+
+int Jim_RegisterApi(Jim_Interp *interp, const char *funcname, void *funcptr)
+{
+    return Jim_AddHashEntry(&interp->stub, funcname, funcptr);
+}
+
+#define JIM_REGISTER_API(name) \
+    Jim_RegisterApi(interp, "Jim_" #name, (void *)Jim_ ## name)
+
+void JimRegisterCoreApi(Jim_Interp *interp)
+{
+  interp->getApiFuncPtr = Jim_GetApi;
+  JIM_REGISTER_API(Alloc);
+  JIM_REGISTER_API(Free);
+  JIM_REGISTER_API(Eval);
+  JIM_REGISTER_API(EvalGlobal);
+  JIM_REGISTER_API(EvalFile);
+  JIM_REGISTER_API(EvalObj);
+  JIM_REGISTER_API(EvalObjBackground);
+  JIM_REGISTER_API(EvalObjVector);
+  JIM_REGISTER_API(InitHashTable);
+  JIM_REGISTER_API(ExpandHashTable);
+  JIM_REGISTER_API(AddHashEntry);
+  JIM_REGISTER_API(ReplaceHashEntry);
+  JIM_REGISTER_API(DeleteHashEntry);
+  JIM_REGISTER_API(FreeHashTable);
+  JIM_REGISTER_API(FindHashEntry);
+  JIM_REGISTER_API(ResizeHashTable);
+  JIM_REGISTER_API(GetHashTableIterator);
+  JIM_REGISTER_API(NextHashEntry);
+  JIM_REGISTER_API(NewObj);
+  JIM_REGISTER_API(FreeObj);
+  JIM_REGISTER_API(InvalidateStringRep);
+  JIM_REGISTER_API(InitStringRep);
+  JIM_REGISTER_API(DuplicateObj);
+  JIM_REGISTER_API(GetString);
+  JIM_REGISTER_API(Length);
+  JIM_REGISTER_API(InvalidateStringRep);
+  JIM_REGISTER_API(NewStringObj);
+  JIM_REGISTER_API(NewStringObjNoAlloc);
+  JIM_REGISTER_API(AppendString);
+  JIM_REGISTER_API(AppendObj);
+  JIM_REGISTER_API(AppendStrings);
+  JIM_REGISTER_API(StringEqObj);
+  JIM_REGISTER_API(StringMatchObj);
+  JIM_REGISTER_API(StringRangeObj);
+  JIM_REGISTER_API(FormatString);
+  JIM_REGISTER_API(CompareStringImmediate);
+  JIM_REGISTER_API(NewReference);
+  JIM_REGISTER_API(GetReference);
+  JIM_REGISTER_API(SetFinalizer);
+  JIM_REGISTER_API(GetFinalizer);
+  JIM_REGISTER_API(CreateInterp);
+  JIM_REGISTER_API(FreeInterp);
+  JIM_REGISTER_API(GetExitCode);
+  JIM_REGISTER_API(SetStdin);
+  JIM_REGISTER_API(SetStdout);
+  JIM_REGISTER_API(SetStderr);
+  JIM_REGISTER_API(CreateCommand);
+  JIM_REGISTER_API(CreateProcedure);
+  JIM_REGISTER_API(DeleteCommand);
+  JIM_REGISTER_API(RenameCommand);
+  JIM_REGISTER_API(GetCommand);
+  JIM_REGISTER_API(SetVariable);
+  JIM_REGISTER_API(SetVariableStr);
+  JIM_REGISTER_API(SetGlobalVariableStr);
+  JIM_REGISTER_API(SetVariableStrWithStr);
+  JIM_REGISTER_API(SetVariableLink);
+  JIM_REGISTER_API(GetVariable);
+  JIM_REGISTER_API(GetCallFrameByLevel);
+  JIM_REGISTER_API(Collect);
+  JIM_REGISTER_API(CollectIfNeeded);
+  JIM_REGISTER_API(GetIndex);
+  JIM_REGISTER_API(NewListObj);
+  JIM_REGISTER_API(ListAppendElement);
+  JIM_REGISTER_API(ListAppendList);
+  JIM_REGISTER_API(ListLength);
+  JIM_REGISTER_API(ListIndex);
+  JIM_REGISTER_API(SetListIndex);
+  JIM_REGISTER_API(ConcatObj);
+  JIM_REGISTER_API(NewDictObj);
+  JIM_REGISTER_API(DictKey);
+  JIM_REGISTER_API(DictKeysVector);
+  JIM_REGISTER_API(GetIndex);
+  JIM_REGISTER_API(GetReturnCode);
+  JIM_REGISTER_API(EvalExpression);
+  JIM_REGISTER_API(GetBoolFromExpr);
+  JIM_REGISTER_API(GetWide);
+  JIM_REGISTER_API(GetLong);
+  JIM_REGISTER_API(SetWide);
+  JIM_REGISTER_API(NewIntObj);
+  JIM_REGISTER_API(GetDouble);
+  JIM_REGISTER_API(SetDouble);
+  JIM_REGISTER_API(NewDoubleObj);
+  JIM_REGISTER_API(WrongNumArgs);
+  JIM_REGISTER_API(SetDictKeysVector);
+  JIM_REGISTER_API(SubstObj);
+  JIM_REGISTER_API(RegisterApi);
+  JIM_REGISTER_API(PrintErrorMessage);
+  JIM_REGISTER_API(InteractivePrompt);
+  JIM_REGISTER_API(RegisterCoreCommands);
+  JIM_REGISTER_API(GetSharedString);
+  JIM_REGISTER_API(ReleaseSharedString);
+  JIM_REGISTER_API(Panic);
+  JIM_REGISTER_API(StrDup);
+  JIM_REGISTER_API(UnsetVariable);
+  JIM_REGISTER_API(GetVariableStr);
+  JIM_REGISTER_API(GetGlobalVariable);
+  JIM_REGISTER_API(GetGlobalVariableStr);
+  JIM_REGISTER_API(GetAssocData);
+  JIM_REGISTER_API(SetAssocData);
+  JIM_REGISTER_API(DeleteAssocData);
+  JIM_REGISTER_API(GetEnum);
+  JIM_REGISTER_API(ScriptIsComplete);
+  JIM_REGISTER_API(PackageRequire);
+  JIM_REGISTER_API(PackageProvide);
+  JIM_REGISTER_API(InitStack);
+  JIM_REGISTER_API(FreeStack);
+  JIM_REGISTER_API(StackLen);
+  JIM_REGISTER_API(StackPush);
+  JIM_REGISTER_API(StackPop);
+  JIM_REGISTER_API(StackPeek);
+  JIM_REGISTER_API(FreeStackElements);
+}
+
+/* -----------------------------------------------------------------------------
+ * Core commands utility functions
+ * ---------------------------------------------------------------------------*/
+void Jim_WrongNumArgs(Jim_Interp *interp, int argc, Jim_Obj *const *argv, 
+        const char *msg)
+{
+    int i;
+    Jim_Obj *objPtr = Jim_NewEmptyStringObj(interp);
+
+    Jim_AppendString(interp, objPtr, "wrong # args: should be \"", -1);
+    for (i = 0; i < argc; i++) {
+        Jim_AppendObj(interp, objPtr, argv[i]);
+        if (!(i+1 == argc && msg[0] == '\0'))
+            Jim_AppendString(interp, objPtr, " ", 1);
+    }
+    Jim_AppendString(interp, objPtr, msg, -1);
+    Jim_AppendString(interp, objPtr, "\"", 1);
+    Jim_SetResult(interp, objPtr);
+}
+
+static Jim_Obj *JimCommandsList(Jim_Interp *interp, Jim_Obj *patternObjPtr)
+{
+    Jim_HashTableIterator *htiter;
+    Jim_HashEntry *he;
+    Jim_Obj *listObjPtr = Jim_NewListObj(interp, NULL, 0);
+    const char *pattern;
+    int patternLen;
+    
+    pattern = patternObjPtr ? Jim_GetString(patternObjPtr, &patternLen) : NULL;
+    htiter = Jim_GetHashTableIterator(&interp->commands);
+    while ((he = Jim_NextHashEntry(htiter)) != NULL) {
+        if (pattern && !JimStringMatch(pattern, patternLen, he->key, 
+                    strlen((const char*)he->key), 0))
+            continue;
+        Jim_ListAppendElement(interp, listObjPtr,
+                Jim_NewStringObj(interp, he->key, -1));
+    }
+    Jim_FreeHashTableIterator(htiter);
+    return listObjPtr;
+}
+
+#define JIM_VARLIST_GLOBALS 0
+#define JIM_VARLIST_LOCALS 1
+#define JIM_VARLIST_VARS 2
+
+static Jim_Obj *JimVariablesList(Jim_Interp *interp, Jim_Obj *patternObjPtr,
+        int mode)
+{
+    Jim_HashTableIterator *htiter;
+    Jim_HashEntry *he;
+    Jim_Obj *listObjPtr = Jim_NewListObj(interp, NULL, 0);
+    const char *pattern;
+    int patternLen;
+    
+    pattern = patternObjPtr ? Jim_GetString(patternObjPtr, &patternLen) : NULL;
+    if (mode == JIM_VARLIST_GLOBALS) {
+        htiter = Jim_GetHashTableIterator(&interp->topFramePtr->vars);
+    } else {
+        /* For [info locals], if we are at top level an emtpy list
+         * is returned. I don't agree, but we aim at compatibility (SS) */
+        if (mode == JIM_VARLIST_LOCALS &&
+            interp->framePtr == interp->topFramePtr)
+            return listObjPtr;
+        htiter = Jim_GetHashTableIterator(&interp->framePtr->vars);
+    }
+    while ((he = Jim_NextHashEntry(htiter)) != NULL) {
+        Jim_Var *varPtr = (Jim_Var*) he->val;
+        if (mode == JIM_VARLIST_LOCALS) {
+            if (varPtr->linkFramePtr != NULL)
+                continue;
+        }
+        if (pattern && !JimStringMatch(pattern, patternLen, he->key, 
+                    strlen((const char*)he->key), 0))
+            continue;
+        Jim_ListAppendElement(interp, listObjPtr,
+                Jim_NewStringObj(interp, he->key, -1));
+    }
+    Jim_FreeHashTableIterator(htiter);
+    return listObjPtr;
+}
+
+static int JimInfoLevel(Jim_Interp *interp, Jim_Obj *levelObjPtr,
+        Jim_Obj **objPtrPtr)
+{
+    Jim_CallFrame *targetCallFrame;
+
+    if (JimGetCallFrameByInteger(interp, levelObjPtr, &targetCallFrame)
+            != JIM_OK)
+        return JIM_ERR;
+    /* No proc call at toplevel callframe */
+    if (targetCallFrame == interp->topFramePtr) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "bad level \"",
+                Jim_GetString(levelObjPtr, NULL), "\"", NULL);
+        return JIM_ERR;
+    }
+    *objPtrPtr = Jim_NewListObj(interp,
+            targetCallFrame->argv,
+            targetCallFrame->argc);
+    return JIM_OK;
+}
+
+/* -----------------------------------------------------------------------------
+ * Core commands
+ * ---------------------------------------------------------------------------*/
+
+/* fake [puts] -- not the real puts, just for debugging. */
+static int Jim_PutsCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    const char *str;
+    int len, nonewline = 0;
+    
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "-nonewline string");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        if (!Jim_CompareStringImmediate(interp, argv[1], "-nonewline"))
+        {
+            Jim_SetResultString(interp, "The second argument must "
+                    "be -nonewline", -1);
+            return JIM_OK;
+        } else {
+            nonewline = 1;
+            argv++;
+        }
+    }
+    str = Jim_GetString(argv[1], &len);
+    Jim_fwrite(interp, str, 1, len, interp->cookie_stdout);
+    if (!nonewline) Jim_fprintf( interp, interp->cookie_stdout, JIM_NL);
+    return JIM_OK;
+}
+
+/* Helper for [+] and [*] */
+static int Jim_AddMulHelper(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv, int op)
+{
+    jim_wide wideValue, res;
+    double doubleValue, doubleRes;
+    int i;
+
+    res = (op == JIM_EXPROP_ADD) ? 0 : 1;
+    
+    for (i = 1; i < argc; i++) {
+        if (Jim_GetWide(interp, argv[i], &wideValue) != JIM_OK)
+            goto trydouble;
+        if (op == JIM_EXPROP_ADD)
+            res += wideValue;
+        else
+            res *= wideValue;
+    }
+    Jim_SetResult(interp, Jim_NewIntObj(interp, res));
+    return JIM_OK;
+trydouble:
+    doubleRes = (double) res;
+    for (;i < argc; i++) {
+        if (Jim_GetDouble(interp, argv[i], &doubleValue) != JIM_OK)
+            return JIM_ERR;
+        if (op == JIM_EXPROP_ADD)
+            doubleRes += doubleValue;
+        else
+            doubleRes *= doubleValue;
+    }
+    Jim_SetResult(interp, Jim_NewDoubleObj(interp, doubleRes));
+    return JIM_OK;
+}
+
+/* Helper for [-] and [/] */
+static int Jim_SubDivHelper(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv, int op)
+{
+    jim_wide wideValue, res = 0;
+    double doubleValue, doubleRes = 0;
+    int i = 2;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "number ?number ... number?");
+        return JIM_ERR;
+    } else if (argc == 2) {
+        /* The arity = 2 case is different. For [- x] returns -x,
+         * while [/ x] returns 1/x. */
+        if (Jim_GetWide(interp, argv[1], &wideValue) != JIM_OK) {
+            if (Jim_GetDouble(interp, argv[1], &doubleValue) !=
+                    JIM_OK)
+            {
+                return JIM_ERR;
+            } else {
+                if (op == JIM_EXPROP_SUB)
+                    doubleRes = -doubleValue;
+                else
+                    doubleRes = 1.0/doubleValue;
+                Jim_SetResult(interp, Jim_NewDoubleObj(interp,
+                            doubleRes));
+                return JIM_OK;
+            }
+        }
+        if (op == JIM_EXPROP_SUB) {
+            res = -wideValue;
+            Jim_SetResult(interp, Jim_NewIntObj(interp, res));
+        } else {
+            doubleRes = 1.0/wideValue;
+            Jim_SetResult(interp, Jim_NewDoubleObj(interp,
+                        doubleRes));
+        }
+        return JIM_OK;
+    } else {
+        if (Jim_GetWide(interp, argv[1], &res) != JIM_OK) {
+            if (Jim_GetDouble(interp, argv[1], &doubleRes)
+                    != JIM_OK) {
+                return JIM_ERR;
+            } else {
+                goto trydouble;
+            }
+        }
+    }
+    for (i = 2; i < argc; i++) {
+        if (Jim_GetWide(interp, argv[i], &wideValue) != JIM_OK) {
+            doubleRes = (double) res;
+            goto trydouble;
+        }
+        if (op == JIM_EXPROP_SUB)
+            res -= wideValue;
+        else
+            res /= wideValue;
+    }
+    Jim_SetResult(interp, Jim_NewIntObj(interp, res));
+    return JIM_OK;
+trydouble:
+    for (;i < argc; i++) {
+        if (Jim_GetDouble(interp, argv[i], &doubleValue) != JIM_OK)
+            return JIM_ERR;
+        if (op == JIM_EXPROP_SUB)
+            doubleRes -= doubleValue;
+        else
+            doubleRes /= doubleValue;
+    }
+    Jim_SetResult(interp, Jim_NewDoubleObj(interp, doubleRes));
+    return JIM_OK;
+}
+
+
+/* [+] */
+static int Jim_AddCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    return Jim_AddMulHelper(interp, argc, argv, JIM_EXPROP_ADD);
+}
+
+/* [*] */
+static int Jim_MulCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    return Jim_AddMulHelper(interp, argc, argv, JIM_EXPROP_MUL);
+}
+
+/* [-] */
+static int Jim_SubCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    return Jim_SubDivHelper(interp, argc, argv, JIM_EXPROP_SUB);
+}
+
+/* [/] */
+static int Jim_DivCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    return Jim_SubDivHelper(interp, argc, argv, JIM_EXPROP_DIV);
+}
+
+/* [set] */
+static int Jim_SetCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?newValue?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        Jim_Obj *objPtr;
+        objPtr = Jim_GetVariable(interp, argv[1], JIM_ERRMSG);
+        if (!objPtr)
+            return JIM_ERR;
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    }
+    /* argc == 3 case. */
+    if (Jim_SetVariable(interp, argv[1], argv[2]) != JIM_OK)
+        return JIM_ERR;
+    Jim_SetResult(interp, argv[2]);
+    return JIM_OK;
+}
+
+/* [unset] */
+static int Jim_UnsetCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?varName ...?");
+        return JIM_ERR;
+    }
+    for (i = 1; i < argc; i++) {
+        if (Jim_UnsetVariable(interp, argv[i], JIM_ERRMSG) != JIM_OK)
+            return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* [incr] */
+static int Jim_IncrCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    jim_wide wideValue, increment = 1;
+    Jim_Obj *intObjPtr;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?increment?");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        if (Jim_GetWide(interp, argv[2], &increment) != JIM_OK)
+            return JIM_ERR;
+    }
+    intObjPtr = Jim_GetVariable(interp, argv[1], JIM_ERRMSG);
+    if (!intObjPtr) return JIM_ERR;
+    if (Jim_GetWide(interp, intObjPtr, &wideValue) != JIM_OK)
+        return JIM_ERR;
+    if (Jim_IsShared(intObjPtr)) {
+        intObjPtr = Jim_NewIntObj(interp, wideValue+increment);
+        if (Jim_SetVariable(interp, argv[1], intObjPtr) != JIM_OK) {
+            Jim_FreeNewObj(interp, intObjPtr);
+            return JIM_ERR;
+        }
+    } else {
+        Jim_SetWide(interp, intObjPtr, wideValue+increment);
+        /* The following step is required in order to invalidate the
+         * string repr of "FOO" if the var name is on the form of "FOO(IDX)" */
+        if (Jim_SetVariable(interp, argv[1], intObjPtr) != JIM_OK) {
+            return JIM_ERR;
+        }
+    }
+    Jim_SetResult(interp, intObjPtr);
+    return JIM_OK;
+}
+
+/* [while] */
+static int Jim_WhileCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "condition body");
+        return JIM_ERR;
+    }
+    /* Try to run a specialized version of while if the expression
+     * is in one of the following forms:
+     *
+     *   $a < CONST, $a < $b
+     *   $a <= CONST, $a <= $b
+     *   $a > CONST, $a > $b
+     *   $a >= CONST, $a >= $b
+     *   $a != CONST, $a != $b
+     *   $a == CONST, $a == $b
+     *   $a
+     *   !$a
+     *   CONST
+     */
+
+#ifdef JIM_OPTIMIZATION
+    {
+        ExprByteCode *expr;
+        Jim_Obj *varAObjPtr = NULL, *varBObjPtr = NULL, *objPtr;
+        int exprLen, retval;
+
+        /* STEP 1 -- Check if there are the conditions to run the specialized
+         * version of while */
+        
+        if ((expr = Jim_GetExpression(interp, argv[1])) == NULL) goto noopt;
+        if (expr->len <= 0 || expr->len > 3) goto noopt;
+        switch(expr->len) {
+        case 1:
+            if (expr->opcode[0] != JIM_EXPROP_VARIABLE &&
+                expr->opcode[0] != JIM_EXPROP_NUMBER)
+                goto noopt;
+            break;
+        case 2:
+            if (expr->opcode[1] != JIM_EXPROP_NOT ||
+                expr->opcode[0] != JIM_EXPROP_VARIABLE)
+                goto noopt;
+            break;
+        case 3:
+            if (expr->opcode[0] != JIM_EXPROP_VARIABLE ||
+                (expr->opcode[1] != JIM_EXPROP_NUMBER &&
+                 expr->opcode[1] != JIM_EXPROP_VARIABLE))
+                goto noopt;
+            switch(expr->opcode[2]) {
+            case JIM_EXPROP_LT:
+            case JIM_EXPROP_LTE:
+            case JIM_EXPROP_GT:
+            case JIM_EXPROP_GTE:
+            case JIM_EXPROP_NUMEQ:
+            case JIM_EXPROP_NUMNE:
+                /* nothing to do */
+                break;
+            default:
+                goto noopt;
+            }
+            break;
+        default:
+            Jim_Panic(interp,
+                "Unexpected default reached in Jim_WhileCoreCommand()");
+            break;
+        }
+
+        /* STEP 2 -- conditions meet. Initialization. Take different
+         * branches for different expression lengths. */
+        exprLen = expr->len;
+
+        if (exprLen == 1) {
+            jim_wide wideValue;
+
+            if (expr->opcode[0] == JIM_EXPROP_VARIABLE) {
+                varAObjPtr = expr->obj[0];
+                Jim_IncrRefCount(varAObjPtr);
+            } else {
+                if (Jim_GetWide(interp, expr->obj[0], &wideValue) != JIM_OK)
+                    goto noopt;
+            }
+            while (1) {
+                if (varAObjPtr) {
+                    if (!(objPtr =
+                               Jim_GetVariable(interp, varAObjPtr, JIM_NONE)) ||
+                        Jim_GetWide(interp, objPtr, &wideValue) != JIM_OK)
+                    {
+                        Jim_DecrRefCount(interp, varAObjPtr);
+                        goto noopt;
+                    }
+                }
+                if (!wideValue) break;
+                if ((retval = Jim_EvalObj(interp, argv[2])) != JIM_OK) {
+                    switch(retval) {
+                    case JIM_BREAK:
+                        if (varAObjPtr)
+                            Jim_DecrRefCount(interp, varAObjPtr);
+                        goto out;
+                        break;
+                    case JIM_CONTINUE:
+                        continue;
+                        break;
+                    default:
+                        if (varAObjPtr)
+                            Jim_DecrRefCount(interp, varAObjPtr);
+                        return retval;
+                    }
+                }
+            }
+            if (varAObjPtr)
+                Jim_DecrRefCount(interp, varAObjPtr);
+        } else if (exprLen == 3) {
+            jim_wide wideValueA, wideValueB, cmpRes = 0;
+            int cmpType = expr->opcode[2];
+
+            varAObjPtr = expr->obj[0];
+            Jim_IncrRefCount(varAObjPtr);
+            if (expr->opcode[1] == JIM_EXPROP_VARIABLE) {
+                varBObjPtr = expr->obj[1];
+                Jim_IncrRefCount(varBObjPtr);
+            } else {
+                if (Jim_GetWide(interp, expr->obj[1], &wideValueB) != JIM_OK)
+                    goto noopt;
+            }
+            while (1) {
+                if (!(objPtr = Jim_GetVariable(interp, varAObjPtr, JIM_NONE)) ||
+                    Jim_GetWide(interp, objPtr, &wideValueA) != JIM_OK)
+                {
+                    Jim_DecrRefCount(interp, varAObjPtr);
+                    if (varBObjPtr)
+                        Jim_DecrRefCount(interp, varBObjPtr);
+                    goto noopt;
+                }
+                if (varBObjPtr) {
+                    if (!(objPtr =
+                               Jim_GetVariable(interp, varBObjPtr, JIM_NONE)) ||
+                        Jim_GetWide(interp, objPtr, &wideValueB) != JIM_OK)
+                    {
+                        Jim_DecrRefCount(interp, varAObjPtr);
+                        if (varBObjPtr)
+                            Jim_DecrRefCount(interp, varBObjPtr);
+                        goto noopt;
+                    }
+                }
+                switch(cmpType) {
+                case JIM_EXPROP_LT:
+                    cmpRes = wideValueA < wideValueB; break;
+                case JIM_EXPROP_LTE:
+                    cmpRes = wideValueA <= wideValueB; break;
+                case JIM_EXPROP_GT:
+                    cmpRes = wideValueA > wideValueB; break;
+                case JIM_EXPROP_GTE:
+                    cmpRes = wideValueA >= wideValueB; break;
+                case JIM_EXPROP_NUMEQ:
+                    cmpRes = wideValueA == wideValueB; break;
+                case JIM_EXPROP_NUMNE:
+                    cmpRes = wideValueA != wideValueB; break;
+                }
+                if (!cmpRes) break;
+                if ((retval = Jim_EvalObj(interp, argv[2])) != JIM_OK) {
+                    switch(retval) {
+                    case JIM_BREAK:
+                        Jim_DecrRefCount(interp, varAObjPtr);
+                        if (varBObjPtr)
+                            Jim_DecrRefCount(interp, varBObjPtr);
+                        goto out;
+                        break;
+                    case JIM_CONTINUE:
+                        continue;
+                        break;
+                    default:
+                        Jim_DecrRefCount(interp, varAObjPtr);
+                        if (varBObjPtr)
+                            Jim_DecrRefCount(interp, varBObjPtr);
+                        return retval;
+                    }
+                }
+            }
+            Jim_DecrRefCount(interp, varAObjPtr);
+            if (varBObjPtr)
+                Jim_DecrRefCount(interp, varBObjPtr);
+        } else {
+            /* TODO: case for len == 2 */
+            goto noopt;
+        }
+        Jim_SetEmptyResult(interp);
+        return JIM_OK;
+    }
+noopt:
+#endif
+
+    /* The general purpose implementation of while starts here */
+    while (1) {
+        int boolean, retval;
+
+        if ((retval = Jim_GetBoolFromExpr(interp, argv[1],
+                        &boolean)) != JIM_OK)
+            return retval;
+        if (!boolean) break;
+        if ((retval = Jim_EvalObj(interp, argv[2])) != JIM_OK) {
+            switch(retval) {
+            case JIM_BREAK:
+                goto out;
+                break;
+            case JIM_CONTINUE:
+                continue;
+                break;
+            default:
+                return retval;
+            }
+        }
+    }
+out:
+    Jim_SetEmptyResult(interp);
+    return JIM_OK;
+}
+
+/* [for] */
+static int Jim_ForCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int retval;
+
+    if (argc != 5) {
+        Jim_WrongNumArgs(interp, 1, argv, "start test next body");
+        return JIM_ERR;
+    }
+    /* Check if the for is on the form:
+     *      for {set i CONST} {$i < CONST} {incr i}
+     *      for {set i CONST} {$i < $j} {incr i}
+     *      for {set i CONST} {$i <= CONST} {incr i}
+     *      for {set i CONST} {$i <= $j} {incr i}
+     * XXX: NOTE: if variable traces are implemented, this optimization
+     * need to be modified to check for the proc epoch at every variable
+     * update. */
+#ifdef JIM_OPTIMIZATION
+    {
+        ScriptObj *initScript, *incrScript;
+        ExprByteCode *expr;
+        jim_wide start, stop, currentVal;
+        unsigned jim_wide procEpoch = interp->procEpoch;
+        Jim_Obj *varNamePtr, *stopVarNamePtr = NULL, *objPtr;
+        int cmpType;
+        struct Jim_Cmd *cmdPtr;
+
+        /* Do it only if there aren't shared arguments */
+        if (argv[1] == argv[2] || argv[2] == argv[3] || argv[1] == argv[3])
+            goto evalstart;
+        initScript = Jim_GetScript(interp, argv[1]);
+        expr = Jim_GetExpression(interp, argv[2]);
+        incrScript = Jim_GetScript(interp, argv[3]);
+
+        /* Ensure proper lengths to start */
+        if (initScript->len != 6) goto evalstart;
+        if (incrScript->len != 4) goto evalstart;
+        if (expr->len != 3) goto evalstart;
+        /* Ensure proper token types. */
+        if (initScript->token[2].type != JIM_TT_ESC ||
+            initScript->token[4].type != JIM_TT_ESC ||
+            incrScript->token[2].type != JIM_TT_ESC ||
+            expr->opcode[0] != JIM_EXPROP_VARIABLE ||
+            (expr->opcode[1] != JIM_EXPROP_NUMBER &&
+             expr->opcode[1] != JIM_EXPROP_VARIABLE) ||
+            (expr->opcode[2] != JIM_EXPROP_LT &&
+             expr->opcode[2] != JIM_EXPROP_LTE))
+            goto evalstart;
+        cmpType = expr->opcode[2];
+        /* Initialization command must be [set] */
+        cmdPtr = Jim_GetCommand(interp, initScript->token[0].objPtr, JIM_NONE);
+        if (cmdPtr == NULL || cmdPtr->cmdProc != Jim_SetCoreCommand)
+            goto evalstart;
+        /* Update command must be incr */
+        cmdPtr = Jim_GetCommand(interp, incrScript->token[0].objPtr, JIM_NONE);
+        if (cmdPtr == NULL || cmdPtr->cmdProc != Jim_IncrCoreCommand)
+            goto evalstart;
+        /* set, incr, expression must be about the same variable */
+        if (!Jim_StringEqObj(initScript->token[2].objPtr,
+                            incrScript->token[2].objPtr, 0))
+            goto evalstart;
+        if (!Jim_StringEqObj(initScript->token[2].objPtr,
+                            expr->obj[0], 0))
+            goto evalstart;
+        /* Check that the initialization and comparison are valid integers */
+        if (Jim_GetWide(interp, initScript->token[4].objPtr, &start) == JIM_ERR)
+            goto evalstart;
+        if (expr->opcode[1] == JIM_EXPROP_NUMBER &&
+            Jim_GetWide(interp, expr->obj[1], &stop) == JIM_ERR)
+        {
+            goto evalstart;
+        }
+
+        /* Initialization */
+        varNamePtr = expr->obj[0];
+        if (expr->opcode[1] == JIM_EXPROP_VARIABLE) {
+            stopVarNamePtr = expr->obj[1];
+            Jim_IncrRefCount(stopVarNamePtr);
+        }
+        Jim_IncrRefCount(varNamePtr);
+
+        /* --- OPTIMIZED FOR --- */
+        /* Start to loop */
+        objPtr = Jim_NewIntObj(interp, start);
+        if (Jim_SetVariable(interp, varNamePtr, objPtr) != JIM_OK) {
+            Jim_DecrRefCount(interp, varNamePtr);
+            if (stopVarNamePtr) Jim_DecrRefCount(interp, stopVarNamePtr);
+            Jim_FreeNewObj(interp, objPtr);
+            goto evalstart;
+        }
+        while (1) {
+            /* === Check condition === */
+            /* Common code: */
+            objPtr = Jim_GetVariable(interp, varNamePtr, JIM_NONE);
+            if (objPtr == NULL ||
+                Jim_GetWide(interp, objPtr, &currentVal) != JIM_OK)
+            {
+                Jim_DecrRefCount(interp, varNamePtr);
+                if (stopVarNamePtr) Jim_DecrRefCount(interp, stopVarNamePtr);
+                goto testcond;
+            }
+            /* Immediate or Variable? get the 'stop' value if the latter. */
+            if (stopVarNamePtr) {
+                objPtr = Jim_GetVariable(interp, stopVarNamePtr, JIM_NONE);
+                if (objPtr == NULL ||
+                    Jim_GetWide(interp, objPtr, &stop) != JIM_OK)
+                {
+                    Jim_DecrRefCount(interp, varNamePtr);
+                    Jim_DecrRefCount(interp, stopVarNamePtr);
+                    goto testcond;
+                }
+            }
+            if (cmpType == JIM_EXPROP_LT) {
+                if (currentVal >= stop) break;
+            } else {
+                if (currentVal > stop) break;
+            }
+            /* Eval body */
+            if ((retval = Jim_EvalObj(interp, argv[4])) != JIM_OK) {
+                switch(retval) {
+                case JIM_BREAK:
+                    if (stopVarNamePtr)
+                        Jim_DecrRefCount(interp, stopVarNamePtr);
+                    Jim_DecrRefCount(interp, varNamePtr);
+                    goto out;
+                case JIM_CONTINUE:
+                    /* nothing to do */
+                    break;
+                default:
+                    if (stopVarNamePtr)
+                        Jim_DecrRefCount(interp, stopVarNamePtr);
+                    Jim_DecrRefCount(interp, varNamePtr);
+                    return retval;
+                }
+            }
+            /* If there was a change in procedures/command continue
+             * with the usual [for] command implementation */
+            if (procEpoch != interp->procEpoch) {
+                if (stopVarNamePtr)
+                    Jim_DecrRefCount(interp, stopVarNamePtr);
+                Jim_DecrRefCount(interp, varNamePtr);
+                goto evalnext;
+            }
+            /* Increment */
+            objPtr = Jim_GetVariable(interp, varNamePtr, JIM_ERRMSG);
+            if (objPtr->refCount == 1 && objPtr->typePtr == &intObjType) {
+                objPtr->internalRep.wideValue ++;
+                Jim_InvalidateStringRep(objPtr);
+            } else {
+                Jim_Obj *auxObjPtr;
+
+                if (Jim_GetWide(interp, objPtr, &currentVal) == JIM_ERR) {
+                    if (stopVarNamePtr)
+                        Jim_DecrRefCount(interp, stopVarNamePtr);
+                    Jim_DecrRefCount(interp, varNamePtr);
+                    goto evalnext;
+                }
+                auxObjPtr = Jim_NewIntObj(interp, currentVal+1);
+                if (Jim_SetVariable(interp, varNamePtr, auxObjPtr) == JIM_ERR) {
+                    if (stopVarNamePtr)
+                        Jim_DecrRefCount(interp, stopVarNamePtr);
+                    Jim_DecrRefCount(interp, varNamePtr);
+                    Jim_FreeNewObj(interp, auxObjPtr);
+                    goto evalnext;
+                }
+            }
+        }
+        if (stopVarNamePtr)
+            Jim_DecrRefCount(interp, stopVarNamePtr);
+        Jim_DecrRefCount(interp, varNamePtr);
+        Jim_SetEmptyResult(interp);
+        return JIM_OK;
+    }
+#endif
+evalstart:
+    /* Eval start */
+    if ((retval = Jim_EvalObj(interp, argv[1])) != JIM_OK)
+        return retval;
+    while (1) {
+        int boolean;
+testcond:
+        /* Test the condition */
+        if ((retval = Jim_GetBoolFromExpr(interp, argv[2], &boolean))
+                != JIM_OK)
+            return retval;
+        if (!boolean) break;
+        /* Eval body */
+        if ((retval = Jim_EvalObj(interp, argv[4])) != JIM_OK) {
+            switch(retval) {
+            case JIM_BREAK:
+                goto out;
+                break;
+            case JIM_CONTINUE:
+                /* Nothing to do */
+                break;
+            default:
+                return retval;
+            }
+        }
+evalnext:
+        /* Eval next */
+        if ((retval = Jim_EvalObj(interp, argv[3])) != JIM_OK) {
+            switch(retval) {
+            case JIM_BREAK:
+                goto out;
+                break;
+            case JIM_CONTINUE:
+                continue;
+                break;
+            default:
+                return retval;
+            }
+        }
+    }
+out:
+    Jim_SetEmptyResult(interp);
+    return JIM_OK;
+}
+
+/* foreach + lmap implementation. */
+static int JimForeachMapHelper(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv, int doMap)
+{
+    int result = JIM_ERR, i, nbrOfLists, *listsIdx, *listsEnd;
+    int nbrOfLoops = 0;
+    Jim_Obj *emptyStr, *script, *mapRes = NULL;
+
+    if (argc < 4 || argc % 2 != 0) {
+        Jim_WrongNumArgs(interp, 1, argv, "varList list ?varList list ...? script");
+        return JIM_ERR;
+    }
+    if (doMap) {
+        mapRes = Jim_NewListObj(interp, NULL, 0);
+        Jim_IncrRefCount(mapRes);
+    }
+    emptyStr = Jim_NewEmptyStringObj(interp);
+    Jim_IncrRefCount(emptyStr);
+    script = argv[argc-1];            /* Last argument is a script */
+    nbrOfLists = (argc - 1 - 1) / 2;  /* argc - 'foreach' - script */
+    listsIdx = (int*)Jim_Alloc(nbrOfLists * sizeof(int));
+    listsEnd = (int*)Jim_Alloc(nbrOfLists*2 * sizeof(int));
+    /* Initialize iterators and remember max nbr elements each list */
+    memset(listsIdx, 0, nbrOfLists * sizeof(int));
+    /* Remember lengths of all lists and calculate how much rounds to loop */
+    for (i=0; i < nbrOfLists*2; i += 2) {
+        div_t cnt;
+        int count;
+        Jim_ListLength(interp, argv[i+1], &listsEnd[i]);
+        Jim_ListLength(interp, argv[i+2], &listsEnd[i+1]);
+        if (listsEnd[i] == 0) {
+            Jim_SetResultString(interp, "foreach varlist is empty", -1);
+            goto err;
+        }
+        cnt = div(listsEnd[i+1], listsEnd[i]);
+        count = cnt.quot + (cnt.rem ? 1 : 0);
+        if (count > nbrOfLoops)
+            nbrOfLoops = count;
+    }
+    for (; nbrOfLoops-- > 0; ) {
+        for (i=0; i < nbrOfLists; ++i) {
+            int varIdx = 0, var = i * 2;
+            while (varIdx < listsEnd[var]) {
+                Jim_Obj *varName, *ele;
+                int lst = i * 2 + 1;
+                if (Jim_ListIndex(interp, argv[var+1], varIdx, &varName, JIM_ERRMSG)
+                        != JIM_OK)
+                        goto err;
+                if (listsIdx[i] < listsEnd[lst]) {
+                    if (Jim_ListIndex(interp, argv[lst+1], listsIdx[i], &ele, JIM_ERRMSG)
+                        != JIM_OK)
+                        goto err;
+                    if (Jim_SetVariable(interp, varName, ele) != JIM_OK) {
+                        Jim_SetResultString(interp, "couldn't set loop variable: ", -1);
+                        goto err;
+                    }
+                    ++listsIdx[i];  /* Remember next iterator of current list */ 
+                } else if (Jim_SetVariable(interp, varName, emptyStr) != JIM_OK) {
+                    Jim_SetResultString(interp, "couldn't set loop variable: ", -1);
+                    goto err;
+                }
+                ++varIdx;  /* Next variable */
+            }
+        }
+        switch (result = Jim_EvalObj(interp, script)) {
+            case JIM_OK:
+                if (doMap)
+                    Jim_ListAppendElement(interp, mapRes, interp->result);
+                break;
+            case JIM_CONTINUE:
+                break;
+            case JIM_BREAK:
+                goto out;
+                break;
+            default:
+                goto err;
+        }
+    }
+out:
+    result = JIM_OK;
+    if (doMap)
+        Jim_SetResult(interp, mapRes);
+    else
+        Jim_SetEmptyResult(interp);
+err:
+    if (doMap)
+        Jim_DecrRefCount(interp, mapRes);
+    Jim_DecrRefCount(interp, emptyStr);
+    Jim_Free(listsIdx);
+    Jim_Free(listsEnd);
+    return result;
+}
+
+/* [foreach] */
+static int Jim_ForeachCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    return JimForeachMapHelper(interp, argc, argv, 0);
+}
+
+/* [lmap] */
+static int Jim_LmapCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    return JimForeachMapHelper(interp, argc, argv, 1);
+}
+
+/* [if] */
+static int Jim_IfCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int boolean, retval, current = 1, falsebody = 0;
+    if (argc >= 3) {
+        while (1) {
+            /* Far not enough arguments given! */
+            if (current >= argc) goto err;
+            if ((retval = Jim_GetBoolFromExpr(interp,
+                        argv[current++], &boolean))
+                    != JIM_OK)
+                return retval;
+            /* There lacks something, isn't it? */
+            if (current >= argc) goto err;
+            if (Jim_CompareStringImmediate(interp, argv[current],
+                        "then")) current++;
+            /* Tsk tsk, no then-clause? */
+            if (current >= argc) goto err;
+            if (boolean)
+                return Jim_EvalObj(interp, argv[current]);
+             /* Ok: no else-clause follows */
+            if (++current >= argc) {
+            	Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));            	
+            	return JIM_OK;
+            }
+            falsebody = current++;
+            if (Jim_CompareStringImmediate(interp, argv[falsebody],
+                        "else")) {
+                /* IIICKS - else-clause isn't last cmd? */
+                if (current != argc-1) goto err;
+                return Jim_EvalObj(interp, argv[current]);
+            } else if (Jim_CompareStringImmediate(interp,
+                        argv[falsebody], "elseif"))
+                /* Ok: elseif follows meaning all the stuff
+                 * again (how boring...) */
+                continue;
+            /* OOPS - else-clause is not last cmd?*/
+            else if (falsebody != argc-1)
+                goto err;
+            return Jim_EvalObj(interp, argv[falsebody]);
+        }
+        return JIM_OK;
+    }
+err:
+    Jim_WrongNumArgs(interp, 1, argv, "condition ?then? trueBody ?elseif ...? ?else? falseBody");
+    return JIM_ERR;
+}
+
+enum {SWITCH_EXACT, SWITCH_GLOB, SWITCH_RE, SWITCH_CMD, SWITCH_UNKNOWN};
+
+/* [switch] */
+static int Jim_SwitchCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int retcode = JIM_ERR, matchOpt = SWITCH_EXACT, opt=1, patCount, i;
+    Jim_Obj *command = 0, *const *caseList = 0, *strObj;
+    Jim_Obj *script = 0;
+    if (argc < 3) goto wrongnumargs;
+    for (opt=1; opt < argc; ++opt) {
+        const char *option = Jim_GetString(argv[opt], 0);
+        if (*option != '-') break;
+        else if (strncmp(option, "--", 2) == 0) { ++opt; break; }
+        else if (strncmp(option, "-exact", 2) == 0) matchOpt = SWITCH_EXACT;
+        else if (strncmp(option, "-glob", 2) == 0) matchOpt = SWITCH_GLOB;
+        else if (strncmp(option, "-regexp", 2) == 0) matchOpt = SWITCH_RE;
+        else if (strncmp(option, "-command", 2) == 0) { matchOpt = SWITCH_CMD;
+            if ((argc - opt) < 2) goto wrongnumargs;
+            command = argv[++opt]; 
+        } else {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "bad option \"", option, "\": must be -exact, -glob, "
+                "-regexp, -command procname or --", 0);
+            goto err;            
+        }
+        if ((argc - opt) < 2) goto wrongnumargs;
+    }
+    strObj = argv[opt++];
+    patCount = argc - opt;
+    if (patCount == 1) {
+        Jim_Obj **vector;
+        JimListGetElements(interp, argv[opt], &patCount, &vector);
+        caseList = vector;
+    } else
+        caseList = &argv[opt];
+    if (patCount == 0 || patCount % 2 != 0) goto wrongnumargs;
+    for (i=0; script == 0 && i < patCount; i += 2) {
+        Jim_Obj *patObj = caseList[i];
+        if (!Jim_CompareStringImmediate(interp, patObj, "default")
+            || i < (patCount-2)) {
+            switch (matchOpt) {
+                case SWITCH_EXACT:
+                    if (Jim_StringEqObj(strObj, patObj, 0))
+                        script = caseList[i+1];
+                    break;
+                case SWITCH_GLOB:
+                    if (Jim_StringMatchObj(patObj, strObj, 0))
+                        script = caseList[i+1];
+                    break;
+                case SWITCH_RE:
+                    command = Jim_NewStringObj(interp, "regexp", -1);
+                    /* Fall thru intentionally */
+                case SWITCH_CMD: {
+                    Jim_Obj *parms[] = {command, patObj, strObj};
+                    int rc = Jim_EvalObjVector(interp, 3, parms);
+                    long matching;
+                    /* After the execution of a command we need to
+                     * make sure to reconvert the object into a list
+                     * again. Only for the single-list style [switch]. */
+                    if (argc-opt == 1) {
+                        Jim_Obj **vector;
+                        JimListGetElements(interp, argv[opt], &patCount,
+                                &vector);
+                        caseList = vector;
+                    }
+                    /* command is here already decref'd */
+                    if (rc != JIM_OK) {
+                        retcode = rc;
+                        goto err;
+                    }
+                    rc = Jim_GetLong(interp, Jim_GetResult(interp), &matching);
+                    if (rc != JIM_OK) {
+                        retcode = rc;
+                        goto err;
+                    }
+                    if (matching)
+                        script = caseList[i+1];
+                    break;
+                }
+                default:
+                    Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+                    Jim_AppendStrings(interp, Jim_GetResult(interp),
+                        "internal error: no such option implemented", 0);
+                    goto err;
+            }
+        } else {
+          script = caseList[i+1];
+        }
+    }
+    for(; i < patCount && Jim_CompareStringImmediate(interp, script, "-");
+        i += 2)
+        script = caseList[i+1];
+    if (script && Jim_CompareStringImmediate(interp, script, "-")) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "no body specified for pattern \"",
+            Jim_GetString(caseList[i-2], 0), "\"", 0);
+        goto err;
+    }
+    retcode = JIM_OK;
+    Jim_SetEmptyResult(interp);
+    if (script != 0)
+        retcode = Jim_EvalObj(interp, script);
+    return retcode;
+wrongnumargs:
+    Jim_WrongNumArgs(interp, 1, argv, "?options? string "
+        "pattern body ... ?default body?   or   "
+        "{pattern body ?pattern body ...?}");
+err:
+    return retcode;        
+}
+
+/* [list] */
+static int Jim_ListCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *listObjPtr;
+
+    listObjPtr = Jim_NewListObj(interp, argv+1, argc-1);
+    Jim_SetResult(interp, listObjPtr);
+    return JIM_OK;
+}
+
+/* [lindex] */
+static int Jim_LindexCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr, *listObjPtr;
+    int i;
+    int index;
+
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "list index ?...?");
+        return JIM_ERR;
+    }
+    objPtr = argv[1];
+    Jim_IncrRefCount(objPtr);
+    for (i = 2; i < argc; i++) {
+        listObjPtr = objPtr;
+        if (Jim_GetIndex(interp, argv[i], &index) != JIM_OK) {
+            Jim_DecrRefCount(interp, listObjPtr);
+            return JIM_ERR;
+        }
+        if (Jim_ListIndex(interp, listObjPtr, index, &objPtr,
+                    JIM_NONE) != JIM_OK) {
+            /* Returns an empty object if the index
+             * is out of range. */
+            Jim_DecrRefCount(interp, listObjPtr);
+            Jim_SetEmptyResult(interp);
+            return JIM_OK;
+        }
+        Jim_IncrRefCount(objPtr);
+        Jim_DecrRefCount(interp, listObjPtr);
+    }
+    Jim_SetResult(interp, objPtr);
+    Jim_DecrRefCount(interp, objPtr);
+    return JIM_OK;
+}
+
+/* [llength] */
+static int Jim_LlengthCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int len;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "list");
+        return JIM_ERR;
+    }
+    Jim_ListLength(interp, argv[1], &len);
+    Jim_SetResult(interp, Jim_NewIntObj(interp, len));
+    return JIM_OK;
+}
+
+/* [lappend] */
+static int Jim_LappendCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *listObjPtr;
+    int shared, i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?value value ...?");
+        return JIM_ERR;
+    }
+    listObjPtr = Jim_GetVariable(interp, argv[1], JIM_NONE);
+    if (!listObjPtr) {
+        /* Create the list if it does not exists */
+        listObjPtr = Jim_NewListObj(interp, NULL, 0);
+        if (Jim_SetVariable(interp, argv[1], listObjPtr) != JIM_OK) {
+            Jim_FreeNewObj(interp, listObjPtr);
+            return JIM_ERR;
+        }
+    }
+    shared = Jim_IsShared(listObjPtr);
+    if (shared)
+        listObjPtr = Jim_DuplicateObj(interp, listObjPtr);
+    for (i = 2; i < argc; i++)
+        Jim_ListAppendElement(interp, listObjPtr, argv[i]);
+    if (Jim_SetVariable(interp, argv[1], listObjPtr) != JIM_OK) {
+        if (shared)
+            Jim_FreeNewObj(interp, listObjPtr);
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, listObjPtr);
+    return JIM_OK;
+}
+
+/* [linsert] */
+static int Jim_LinsertCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int index, len;
+    Jim_Obj *listPtr;
+
+    if (argc < 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "list index element "
+            "?element ...?");
+        return JIM_ERR;
+    }
+    listPtr = argv[1];
+    if (Jim_IsShared(listPtr))
+        listPtr = Jim_DuplicateObj(interp, listPtr);
+    if (Jim_GetIndex(interp, argv[2], &index) != JIM_OK)
+        goto err;
+    Jim_ListLength(interp, listPtr, &len);
+    if (index >= len)
+        index = len;
+    else if (index < 0)
+        index = len + index + 1;
+    Jim_ListInsertElements(interp, listPtr, index, argc-3, &argv[3]);
+    Jim_SetResult(interp, listPtr);
+    return JIM_OK;
+err:
+    if (listPtr != argv[1]) {
+        Jim_FreeNewObj(interp, listPtr);
+    }
+    return JIM_ERR;
+}
+
+/* [lset] */
+static int Jim_LsetCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "listVar ?index...? newVal");
+        return JIM_ERR;
+    } else if (argc == 3) {
+        if (Jim_SetVariable(interp, argv[1], argv[2]) != JIM_OK)
+            return JIM_ERR;
+        Jim_SetResult(interp, argv[2]);
+        return JIM_OK;
+    }
+    if (Jim_SetListIndex(interp, argv[1], argv+2, argc-3, argv[argc-1])
+            == JIM_ERR) return JIM_ERR;
+    return JIM_OK;
+}
+
+/* [lsort] */
+static int Jim_LsortCoreCommand(Jim_Interp *interp, int argc, Jim_Obj *const argv[])
+{
+    const char *options[] = {
+        "-ascii", "-nocase", "-increasing", "-decreasing", NULL
+    };
+    enum {OPT_ASCII, OPT_NOCASE, OPT_INCREASING, OPT_DECREASING};
+    Jim_Obj *resObj;
+    int i, lsortType = JIM_LSORT_ASCII; /* default sort type */
+    int decreasing = 0;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "?options? list");
+        return JIM_ERR;
+    }
+    for (i = 1; i < (argc-1); i++) {
+        int option;
+
+        if (Jim_GetEnum(interp, argv[i], options, &option, "option", JIM_ERRMSG)
+                != JIM_OK)
+            return JIM_ERR;
+        switch(option) {
+        case OPT_ASCII: lsortType = JIM_LSORT_ASCII; break;
+        case OPT_NOCASE: lsortType = JIM_LSORT_NOCASE; break;
+        case OPT_INCREASING: decreasing = 0; break;
+        case OPT_DECREASING: decreasing = 1; break;
+        }
+    }
+    if (decreasing) {
+        switch(lsortType) {
+        case JIM_LSORT_ASCII: lsortType = JIM_LSORT_ASCII_DECR; break;
+        case JIM_LSORT_NOCASE: lsortType = JIM_LSORT_NOCASE_DECR; break;
+        }
+    }
+    resObj = Jim_DuplicateObj(interp, argv[argc-1]);
+    ListSortElements(interp, resObj, lsortType);
+    Jim_SetResult(interp, resObj);
+    return JIM_OK;
+}
+
+/* [append] */
+static int Jim_AppendCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *stringObjPtr;
+    int shared, i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?value value ...?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        stringObjPtr = Jim_GetVariable(interp, argv[1], JIM_ERRMSG);
+        if (!stringObjPtr) return JIM_ERR;
+    } else {
+        stringObjPtr = Jim_GetVariable(interp, argv[1], JIM_NONE);
+        if (!stringObjPtr) {
+            /* Create the string if it does not exists */
+            stringObjPtr = Jim_NewEmptyStringObj(interp);
+            if (Jim_SetVariable(interp, argv[1], stringObjPtr)
+                    != JIM_OK) {
+                Jim_FreeNewObj(interp, stringObjPtr);
+                return JIM_ERR;
+            }
+        }
+    }
+    shared = Jim_IsShared(stringObjPtr);
+    if (shared)
+        stringObjPtr = Jim_DuplicateObj(interp, stringObjPtr);
+    for (i = 2; i < argc; i++)
+        Jim_AppendObj(interp, stringObjPtr, argv[i]);
+    if (Jim_SetVariable(interp, argv[1], stringObjPtr) != JIM_OK) {
+        if (shared)
+            Jim_FreeNewObj(interp, stringObjPtr);
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, stringObjPtr);
+    return JIM_OK;
+}
+
+/* [debug] */
+static int Jim_DebugCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    const char *options[] = {
+        "refcount", "objcount", "objects", "invstr", "scriptlen", "exprlen",
+        "exprbc",
+        NULL
+    };
+    enum {
+        OPT_REFCOUNT, OPT_OBJCOUNT, OPT_OBJECTS, OPT_INVSTR, OPT_SCRIPTLEN,
+        OPT_EXPRLEN, OPT_EXPRBC
+    };
+    int option;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "option ?...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetEnum(interp, argv[1], options, &option, "option",
+                JIM_ERRMSG) != JIM_OK)
+        return JIM_ERR;
+    if (option == OPT_REFCOUNT) {
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "object");
+            return JIM_ERR;
+        }
+        Jim_SetResult(interp, Jim_NewIntObj(interp, argv[2]->refCount));
+        return JIM_OK;
+    } else if (option == OPT_OBJCOUNT) {
+        int freeobj = 0, liveobj = 0;
+        char buf[256];
+        Jim_Obj *objPtr;
+
+        if (argc != 2) {
+            Jim_WrongNumArgs(interp, 2, argv, "");
+            return JIM_ERR;
+        }
+        /* Count the number of free objects. */
+        objPtr = interp->freeList;
+        while (objPtr) {
+            freeobj++;
+            objPtr = objPtr->nextObjPtr;
+        }
+        /* Count the number of live objects. */
+        objPtr = interp->liveList;
+        while (objPtr) {
+            liveobj++;
+            objPtr = objPtr->nextObjPtr;
+        }
+        /* Set the result string and return. */
+        sprintf(buf, "free %d used %d", freeobj, liveobj);
+        Jim_SetResultString(interp, buf, -1);
+        return JIM_OK;
+    } else if (option == OPT_OBJECTS) {
+        Jim_Obj *objPtr, *listObjPtr, *subListObjPtr;
+        /* Count the number of live objects. */
+        objPtr = interp->liveList;
+        listObjPtr = Jim_NewListObj(interp, NULL, 0);
+        while (objPtr) {
+            char buf[128];
+            const char *type = objPtr->typePtr ?
+                objPtr->typePtr->name : "";
+            subListObjPtr = Jim_NewListObj(interp, NULL, 0);
+            sprintf(buf, "%p", objPtr);
+            Jim_ListAppendElement(interp, subListObjPtr,
+                Jim_NewStringObj(interp, buf, -1));
+            Jim_ListAppendElement(interp, subListObjPtr,
+                Jim_NewStringObj(interp, type, -1));
+            Jim_ListAppendElement(interp, subListObjPtr,
+                Jim_NewIntObj(interp, objPtr->refCount));
+            Jim_ListAppendElement(interp, subListObjPtr, objPtr);
+            Jim_ListAppendElement(interp, listObjPtr, subListObjPtr);
+            objPtr = objPtr->nextObjPtr;
+        }
+        Jim_SetResult(interp, listObjPtr);
+        return JIM_OK;
+    } else if (option == OPT_INVSTR) {
+        Jim_Obj *objPtr;
+
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "object");
+            return JIM_ERR;
+        }
+        objPtr = argv[2];
+        if (objPtr->typePtr != NULL)
+            Jim_InvalidateStringRep(objPtr);
+        Jim_SetEmptyResult(interp);
+        return JIM_OK;
+    } else if (option == OPT_SCRIPTLEN) {
+        ScriptObj *script;
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "script");
+            return JIM_ERR;
+        }
+        script = Jim_GetScript(interp, argv[2]);
+        Jim_SetResult(interp, Jim_NewIntObj(interp, script->len));
+        return JIM_OK;
+    } else if (option == OPT_EXPRLEN) {
+        ExprByteCode *expr;
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "expression");
+            return JIM_ERR;
+        }
+        expr = Jim_GetExpression(interp, argv[2]);
+        if (expr == NULL)
+            return JIM_ERR;
+        Jim_SetResult(interp, Jim_NewIntObj(interp, expr->len));
+        return JIM_OK;
+    } else if (option == OPT_EXPRBC) {
+        Jim_Obj *objPtr;
+        ExprByteCode *expr;
+        int i;
+
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "expression");
+            return JIM_ERR;
+        }
+        expr = Jim_GetExpression(interp, argv[2]);
+        if (expr == NULL)
+            return JIM_ERR;
+        objPtr = Jim_NewListObj(interp, NULL, 0);
+        for (i = 0; i < expr->len; i++) {
+            const char *type;
+            Jim_ExprOperator *op;
+
+            switch(expr->opcode[i]) {
+            case JIM_EXPROP_NUMBER: type = "number"; break;
+            case JIM_EXPROP_COMMAND: type = "command"; break;
+            case JIM_EXPROP_VARIABLE: type = "variable"; break;
+            case JIM_EXPROP_DICTSUGAR: type = "dictsugar"; break;
+            case JIM_EXPROP_SUBST: type = "subst"; break;
+            case JIM_EXPROP_STRING: type = "string"; break;
+            default:
+                op = JimExprOperatorInfo(Jim_GetString(expr->obj[i], NULL));
+                if (op == NULL) {
+                    type = "private";
+                } else {
+                    type = "operator";
+                }
+                break;
+            }
+            Jim_ListAppendElement(interp, objPtr,
+                    Jim_NewStringObj(interp, type, -1));
+            Jim_ListAppendElement(interp, objPtr, expr->obj[i]);
+        }
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    } else {
+        Jim_SetResultString(interp,
+            "bad option. Valid options are refcount, "
+            "objcount, objects, invstr", -1);
+        return JIM_ERR;
+    }
+    return JIM_OK; /* unreached */
+}
+
+/* [eval] */
+static int Jim_EvalCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc == 2) {
+        return Jim_EvalObj(interp, argv[1]);
+    } else if (argc > 2) {
+        Jim_Obj *objPtr;
+        int retcode;
+
+        objPtr = Jim_ConcatObj(interp, argc-1, argv+1);
+        Jim_IncrRefCount(objPtr);
+        retcode = Jim_EvalObj(interp, objPtr);
+        Jim_DecrRefCount(interp, objPtr);
+        return retcode;
+    } else {
+        Jim_WrongNumArgs(interp, 1, argv, "script ?...?");
+        return JIM_ERR;
+    }
+}
+
+/* [uplevel] */
+static int Jim_UplevelCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc >= 2) {
+        int retcode, newLevel, oldLevel;
+        Jim_CallFrame *savedCallFrame, *targetCallFrame;
+        Jim_Obj *objPtr;
+        const char *str;
+
+        /* Save the old callframe pointer */
+        savedCallFrame = interp->framePtr;
+
+        /* Lookup the target frame pointer */
+        str = Jim_GetString(argv[1], NULL);
+        if ((str[0] >= '0' && str[0] <= '9') || str[0] == '#')
+        {
+            if (Jim_GetCallFrameByLevel(interp, argv[1],
+                        &targetCallFrame,
+                        &newLevel) != JIM_OK)
+                return JIM_ERR;
+            argc--;
+            argv++;
+        } else {
+            if (Jim_GetCallFrameByLevel(interp, NULL,
+                        &targetCallFrame,
+                        &newLevel) != JIM_OK)
+                return JIM_ERR;
+        }
+        if (argc < 2) {
+            argc++;
+            argv--;
+            Jim_WrongNumArgs(interp, 1, argv,
+                    "?level? command ?arg ...?");
+            return JIM_ERR;
+        }
+        /* Eval the code in the target callframe. */
+        interp->framePtr = targetCallFrame;
+        oldLevel = interp->numLevels;
+        interp->numLevels = newLevel;
+        if (argc == 2) {
+            retcode = Jim_EvalObj(interp, argv[1]);
+        } else {
+            objPtr = Jim_ConcatObj(interp, argc-1, argv+1);
+            Jim_IncrRefCount(objPtr);
+            retcode = Jim_EvalObj(interp, objPtr);
+            Jim_DecrRefCount(interp, objPtr);
+        }
+        interp->numLevels = oldLevel;
+        interp->framePtr = savedCallFrame;
+        return retcode;
+    } else {
+        Jim_WrongNumArgs(interp, 1, argv, "?level? command ?arg ...?");
+        return JIM_ERR;
+    }
+}
+
+/* [expr] */
+static int Jim_ExprCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *exprResultPtr;
+    int retcode;
+
+    if (argc == 2) {
+        retcode = Jim_EvalExpression(interp, argv[1], &exprResultPtr);
+    } else if (argc > 2) {
+        Jim_Obj *objPtr;
+
+        objPtr = Jim_ConcatObj(interp, argc-1, argv+1);
+        Jim_IncrRefCount(objPtr);
+        retcode = Jim_EvalExpression(interp, objPtr, &exprResultPtr);
+        Jim_DecrRefCount(interp, objPtr);
+    } else {
+        Jim_WrongNumArgs(interp, 1, argv, "expression ?...?");
+        return JIM_ERR;
+    }
+    if (retcode != JIM_OK) return retcode;
+    Jim_SetResult(interp, exprResultPtr);
+    Jim_DecrRefCount(interp, exprResultPtr);
+    return JIM_OK;
+}
+
+/* [break] */
+static int Jim_BreakCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+    return JIM_BREAK;
+}
+
+/* [continue] */
+static int Jim_ContinueCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+    return JIM_CONTINUE;
+}
+
+/* [return] */
+static int Jim_ReturnCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc == 1) {
+        return JIM_RETURN;
+    } else if (argc == 2) {
+        Jim_SetResult(interp, argv[1]);
+        interp->returnCode = JIM_OK;
+        return JIM_RETURN;
+    } else if (argc == 3 || argc == 4) {
+        int returnCode;
+        if (Jim_GetReturnCode(interp, argv[2], &returnCode) == JIM_ERR)
+            return JIM_ERR;
+        interp->returnCode = returnCode;
+        if (argc == 4)
+            Jim_SetResult(interp, argv[3]);
+        return JIM_RETURN;
+    } else {
+        Jim_WrongNumArgs(interp, 1, argv, "?-code code? ?result?");
+        return JIM_ERR;
+    }
+    return JIM_RETURN; /* unreached */
+}
+
+/* [tailcall] */
+static int Jim_TailcallCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+
+    objPtr = Jim_NewListObj(interp, argv+1, argc-1);
+    Jim_SetResult(interp, objPtr);
+    return JIM_EVAL;
+}
+
+/* [proc] */
+static int Jim_ProcCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int argListLen;
+    int arityMin, arityMax;
+
+    if (argc != 4 && argc != 5) {
+        Jim_WrongNumArgs(interp, 1, argv, "name arglist ?statics? body");
+        return JIM_ERR;
+    }
+    Jim_ListLength(interp, argv[2], &argListLen);
+    arityMin = arityMax = argListLen+1;
+    if (argListLen) {
+        const char *str;
+        int len;
+        Jim_Obj *lastArgPtr;
+        
+        Jim_ListIndex(interp, argv[2], argListLen-1, &lastArgPtr, JIM_NONE);
+        str = Jim_GetString(lastArgPtr, &len);
+        if (len == 4 && memcmp(str, "args", 4) == 0) {
+            arityMin--;
+            arityMax = -1;
+        }
+    }
+    if (argc == 4) {
+        return Jim_CreateProcedure(interp, Jim_GetString(argv[1], NULL),
+                argv[2], NULL, argv[3], arityMin, arityMax);
+    } else {
+        return Jim_CreateProcedure(interp, Jim_GetString(argv[1], NULL),
+                argv[2], argv[3], argv[4], arityMin, arityMax);
+    }
+}
+
+/* [concat] */
+static int Jim_ConcatCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_SetResult(interp, Jim_ConcatObj(interp, argc-1, argv+1));
+    return JIM_OK;
+}
+
+/* [upvar] */
+static int Jim_UpvarCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    const char *str;
+    int i;
+    Jim_CallFrame *targetCallFrame;
+
+    /* Lookup the target frame pointer */
+    str = Jim_GetString(argv[1], NULL);
+    if (argc > 3 && 
+        ((str[0] >= '0' && str[0] <= '9') || str[0] == '#'))
+    {
+        if (Jim_GetCallFrameByLevel(interp, argv[1],
+                    &targetCallFrame, NULL) != JIM_OK)
+            return JIM_ERR;
+        argc--;
+        argv++;
+    } else {
+        if (Jim_GetCallFrameByLevel(interp, NULL,
+                    &targetCallFrame, NULL) != JIM_OK)
+            return JIM_ERR;
+    }
+    /* Check for arity */
+    if (argc < 3 || ((argc-1)%2) != 0) {
+        Jim_WrongNumArgs(interp, 1, argv, "?level? otherVar localVar ?otherVar localVar ...?");
+        return JIM_ERR;
+    }
+    /* Now... for every other/local couple: */
+    for (i = 1; i < argc; i += 2) {
+        if (Jim_SetVariableLink(interp, argv[i+1], argv[i],
+                targetCallFrame) != JIM_OK) return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* [global] */
+static int Jim_GlobalCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int i;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName ?varName ...?");
+        return JIM_ERR;
+    }
+    /* Link every var to the toplevel having the same name */
+    if (interp->numLevels == 0) return JIM_OK; /* global at toplevel... */
+    for (i = 1; i < argc; i++) {
+        if (Jim_SetVariableLink(interp, argv[i], argv[i],
+                interp->topFramePtr) != JIM_OK) return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* does the [string map] operation. On error NULL is returned,
+ * otherwise a new string object with the result, having refcount = 0,
+ * is returned. */
+static Jim_Obj *JimStringMap(Jim_Interp *interp, Jim_Obj *mapListObjPtr,
+        Jim_Obj *objPtr, int nocase)
+{
+    int numMaps;
+    const char **key, *str, *noMatchStart = NULL;
+    Jim_Obj **value;
+    int *keyLen, strLen, i;
+    Jim_Obj *resultObjPtr;
+    
+    Jim_ListLength(interp, mapListObjPtr, &numMaps);
+    if (numMaps % 2) {
+        Jim_SetResultString(interp,
+                "list must contain an even number of elements", -1);
+        return NULL;
+    }
+    /* Initialization */
+    numMaps /= 2;
+    key = Jim_Alloc(sizeof(char*)*numMaps);
+    keyLen = Jim_Alloc(sizeof(int)*numMaps);
+    value = Jim_Alloc(sizeof(Jim_Obj*)*numMaps);
+    resultObjPtr = Jim_NewStringObj(interp, "", 0);
+    for (i = 0; i < numMaps; i++) {
+        Jim_Obj *eleObjPtr;
+
+        Jim_ListIndex(interp, mapListObjPtr, i*2, &eleObjPtr, JIM_NONE);
+        key[i] = Jim_GetString(eleObjPtr, &keyLen[i]);
+        Jim_ListIndex(interp, mapListObjPtr, i*2+1, &eleObjPtr, JIM_NONE);
+        value[i] = eleObjPtr;
+    }
+    str = Jim_GetString(objPtr, &strLen);
+    /* Map it */
+    while(strLen) {
+        for (i = 0; i < numMaps; i++) {
+            if (strLen >= keyLen[i] && keyLen[i]) {
+                if (!JimStringCompare(str, keyLen[i], key[i], keyLen[i],
+                            nocase))
+                {
+                    if (noMatchStart) {
+                        Jim_AppendString(interp, resultObjPtr,
+                                noMatchStart, str-noMatchStart);
+                        noMatchStart = NULL;
+                    }
+                    Jim_AppendObj(interp, resultObjPtr, value[i]);
+                    str += keyLen[i];
+                    strLen -= keyLen[i];
+                    break;
+                }
+            }
+        }
+        if (i == numMaps) { /* no match */
+            if (noMatchStart == NULL)
+                noMatchStart = str;
+            str ++;
+            strLen --;
+        }
+    }
+    if (noMatchStart) {
+        Jim_AppendString(interp, resultObjPtr,
+            noMatchStart, str-noMatchStart);
+    }
+    Jim_Free((void*)key);
+    Jim_Free(keyLen);
+    Jim_Free(value);
+    return resultObjPtr;
+}
+
+/* [string] */
+static int Jim_StringCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int option;
+    const char *options[] = {
+        "length", "compare", "match", "equal", "range", "map", "repeat",
+        "index", "first", "tolower", "toupper", NULL
+    };
+    enum {
+        OPT_LENGTH, OPT_COMPARE, OPT_MATCH, OPT_EQUAL, OPT_RANGE,
+        OPT_MAP, OPT_REPEAT, OPT_INDEX, OPT_FIRST, OPT_TOLOWER, OPT_TOUPPER
+    };
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "option ?arguments ...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetEnum(interp, argv[1], options, &option, "option",
+                JIM_ERRMSG) != JIM_OK)
+        return JIM_ERR;
+
+    if (option == OPT_LENGTH) {
+        int len;
+
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "string");
+            return JIM_ERR;
+        }
+        Jim_GetString(argv[2], &len);
+        Jim_SetResult(interp, Jim_NewIntObj(interp, len));
+        return JIM_OK;
+    } else if (option == OPT_COMPARE) {
+        int nocase = 0;
+        if ((argc != 4 && argc != 5) ||
+            (argc == 5 && Jim_CompareStringImmediate(interp,
+                argv[2], "-nocase") == 0)) {
+            Jim_WrongNumArgs(interp, 2, argv, "string1 string2");
+            return JIM_ERR;
+        }
+        if (argc == 5) {
+            nocase = 1;
+            argv++;
+        }
+        Jim_SetResult(interp, Jim_NewIntObj(interp,
+                    Jim_StringCompareObj(argv[2],
+                            argv[3], nocase)));
+        return JIM_OK;
+    } else if (option == OPT_MATCH) {
+        int nocase = 0;
+        if ((argc != 4 && argc != 5) ||
+            (argc == 5 && Jim_CompareStringImmediate(interp,
+                argv[2], "-nocase") == 0)) {
+            Jim_WrongNumArgs(interp, 2, argv, "?-nocase? pattern "
+                    "string");
+            return JIM_ERR;
+        }
+        if (argc == 5) {
+            nocase = 1;
+            argv++;
+        }
+        Jim_SetResult(interp,
+            Jim_NewIntObj(interp, Jim_StringMatchObj(argv[2],
+                    argv[3], nocase)));
+        return JIM_OK;
+    } else if (option == OPT_EQUAL) {
+        if (argc != 4) {
+            Jim_WrongNumArgs(interp, 2, argv, "string1 string2");
+            return JIM_ERR;
+        }
+        Jim_SetResult(interp,
+            Jim_NewIntObj(interp, Jim_StringEqObj(argv[2],
+                    argv[3], 0)));
+        return JIM_OK;
+    } else if (option == OPT_RANGE) {
+        Jim_Obj *objPtr;
+
+        if (argc != 5) {
+            Jim_WrongNumArgs(interp, 2, argv, "string first last");
+            return JIM_ERR;
+        }
+        objPtr = Jim_StringRangeObj(interp, argv[2], argv[3], argv[4]);
+        if (objPtr == NULL)
+            return JIM_ERR;
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    } else if (option == OPT_MAP) {
+        int nocase = 0;
+        Jim_Obj *objPtr;
+
+        if ((argc != 4 && argc != 5) ||
+            (argc == 5 && Jim_CompareStringImmediate(interp,
+                argv[2], "-nocase") == 0)) {
+            Jim_WrongNumArgs(interp, 2, argv, "?-nocase? mapList "
+                    "string");
+            return JIM_ERR;
+        }
+        if (argc == 5) {
+            nocase = 1;
+            argv++;
+        }
+        objPtr = JimStringMap(interp, argv[2], argv[3], nocase);
+        if (objPtr == NULL)
+            return JIM_ERR;
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    } else if (option == OPT_REPEAT) {
+        Jim_Obj *objPtr;
+        jim_wide count;
+
+        if (argc != 4) {
+            Jim_WrongNumArgs(interp, 2, argv, "string count");
+            return JIM_ERR;
+        }
+        if (Jim_GetWide(interp, argv[3], &count) != JIM_OK)
+            return JIM_ERR;
+        objPtr = Jim_NewStringObj(interp, "", 0);
+        while (count--) {
+            Jim_AppendObj(interp, objPtr, argv[2]);
+        }
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    } else if (option == OPT_INDEX) {
+        int index, len;
+        const char *str;
+
+        if (argc != 4) {
+            Jim_WrongNumArgs(interp, 2, argv, "string index");
+            return JIM_ERR;
+        }
+        if (Jim_GetIndex(interp, argv[3], &index) != JIM_OK)
+            return JIM_ERR;
+        str = Jim_GetString(argv[2], &len);
+        if (index != INT_MIN && index != INT_MAX)
+            index = JimRelToAbsIndex(len, index);
+        if (index < 0 || index >= len) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            return JIM_OK;
+        } else {
+            Jim_SetResult(interp, Jim_NewStringObj(interp, str+index, 1));
+            return JIM_OK;
+        }
+    } else if (option == OPT_FIRST) {
+        int index = 0, l1, l2;
+        const char *s1, *s2;
+
+        if (argc != 4 && argc != 5) {
+            Jim_WrongNumArgs(interp, 2, argv, "subString string ?startIndex?");
+            return JIM_ERR;
+        }
+        s1 = Jim_GetString(argv[2], &l1);
+        s2 = Jim_GetString(argv[3], &l2);
+        if (argc == 5) {
+            if (Jim_GetIndex(interp, argv[4], &index) != JIM_OK)
+                return JIM_ERR;
+            index = JimRelToAbsIndex(l2, index);
+        }
+        Jim_SetResult(interp, Jim_NewIntObj(interp,
+                    JimStringFirst(s1, l1, s2, l2, index)));
+        return JIM_OK;
+    } else if (option == OPT_TOLOWER) {
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "string");
+            return JIM_ERR;
+        }
+        Jim_SetResult(interp, JimStringToLower(interp, argv[2]));
+    } else if (option == OPT_TOUPPER) {
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "string");
+            return JIM_ERR;
+        }
+        Jim_SetResult(interp, JimStringToUpper(interp, argv[2]));
+    }
+    return JIM_OK;
+}
+
+/* [time] */
+static int Jim_TimeCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    long i, count = 1;
+    jim_wide start, elapsed;
+    char buf [256];
+    const char *fmt = "%" JIM_WIDE_MODIFIER " microseconds per iteration";
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "script ?count?");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        if (Jim_GetLong(interp, argv[2], &count) != JIM_OK)
+            return JIM_ERR;
+    }
+    if (count < 0)
+        return JIM_OK;
+    i = count;
+    start = JimClock();
+    while (i-- > 0) {
+        int retval;
+
+        if ((retval = Jim_EvalObj(interp, argv[1])) != JIM_OK)
+            return retval;
+    }
+    elapsed = JimClock() - start;
+    sprintf(buf, fmt, elapsed/count);
+    Jim_SetResultString(interp, buf, -1);
+    return JIM_OK;
+}
+
+/* [exit] */
+static int Jim_ExitCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    long exitCode = 0;
+
+    if (argc > 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "?exitCode?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        if (Jim_GetLong(interp, argv[1], &exitCode) != JIM_OK)
+            return JIM_ERR;
+    }
+    interp->exitCode = exitCode;
+    return JIM_EXIT;
+}
+
+/* [catch] */
+static int Jim_CatchCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int exitCode = 0;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "script ?varName?");
+        return JIM_ERR;
+    }
+    exitCode = Jim_EvalObj(interp, argv[1]);
+    if (argc == 3) {
+        if (Jim_SetVariable(interp, argv[2], Jim_GetResult(interp))
+                != JIM_OK)
+            return JIM_ERR;
+    }
+    Jim_SetResult(interp, Jim_NewIntObj(interp, exitCode));
+    return JIM_OK;
+}
+
+/* [ref] */
+static int Jim_RefCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc != 3 && argc != 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "string tag ?finalizer?");
+        return JIM_ERR;
+    }
+    if (argc == 3) {
+        Jim_SetResult(interp, Jim_NewReference(interp, argv[1], argv[2], NULL));
+    } else {
+        Jim_SetResult(interp, Jim_NewReference(interp, argv[1], argv[2],
+                    argv[3]));
+    }
+    return JIM_OK;
+}
+
+/* [getref] */
+static int Jim_GetrefCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Reference *refPtr;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "reference");
+        return JIM_ERR;
+    }
+    if ((refPtr = Jim_GetReference(interp, argv[1])) == NULL)
+        return JIM_ERR;
+    Jim_SetResult(interp, refPtr->objPtr);
+    return JIM_OK;
+}
+
+/* [setref] */
+static int Jim_SetrefCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    Jim_Reference *refPtr;
+
+    if (argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "reference newValue");
+        return JIM_ERR;
+    }
+    if ((refPtr = Jim_GetReference(interp, argv[1])) == NULL)
+        return JIM_ERR;
+    Jim_IncrRefCount(argv[2]);
+    Jim_DecrRefCount(interp, refPtr->objPtr);
+    refPtr->objPtr = argv[2];
+    Jim_SetResult(interp, argv[2]);
+    return JIM_OK;
+}
+
+/* [collect] */
+static int Jim_CollectCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc != 1) {
+        Jim_WrongNumArgs(interp, 1, argv, "");
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, Jim_NewIntObj(interp, Jim_Collect(interp)));
+    return JIM_OK;
+}
+
+/* [finalize] reference ?newValue? */
+static int Jim_FinalizeCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "reference ?finalizerProc?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        Jim_Obj *cmdNamePtr;
+
+        if (Jim_GetFinalizer(interp, argv[1], &cmdNamePtr) != JIM_OK)
+            return JIM_ERR;
+        if (cmdNamePtr != NULL) /* otherwise the null string is returned. */
+            Jim_SetResult(interp, cmdNamePtr);
+    } else {
+        if (Jim_SetFinalizer(interp, argv[1], argv[2]) != JIM_OK)
+            return JIM_ERR;
+        Jim_SetResult(interp, argv[2]);
+    }
+    return JIM_OK;
+}
+
+/* TODO */
+/* [info references] (list of all the references/finalizers) */
+
+/* [rename] */
+static int Jim_RenameCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    const char *oldName, *newName;
+
+    if (argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "oldName newName");
+        return JIM_ERR;
+    }
+    oldName = Jim_GetString(argv[1], NULL);
+    newName = Jim_GetString(argv[2], NULL);
+    if (Jim_RenameCommand(interp, oldName, newName) != JIM_OK) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "can't rename \"", oldName, "\": ",
+            "command doesn't exist", NULL);
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* [dict] */
+static int Jim_DictCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int option;
+    const char *options[] = {
+        "create", "get", "set", "unset", "exists", NULL
+    };
+    enum {
+        OPT_CREATE, OPT_GET, OPT_SET, OPT_UNSET, OPT_EXIST
+    };
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "option ?arguments ...?");
+        return JIM_ERR;
+    }
+
+    if (Jim_GetEnum(interp, argv[1], options, &option, "option",
+                JIM_ERRMSG) != JIM_OK)
+        return JIM_ERR;
+
+    if (option == OPT_CREATE) {
+        Jim_Obj *objPtr;
+
+        if (argc % 2) {
+            Jim_WrongNumArgs(interp, 2, argv, "?key value ...?");
+            return JIM_ERR;
+        }
+        objPtr = Jim_NewDictObj(interp, argv+2, argc-2);
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    } else if (option == OPT_GET) {
+        Jim_Obj *objPtr;
+
+        if (Jim_DictKeysVector(interp, argv[2], argv+3, argc-3, &objPtr,
+                JIM_ERRMSG) != JIM_OK)
+            return JIM_ERR;
+        Jim_SetResult(interp, objPtr);
+        return JIM_OK;
+    } else if (option == OPT_SET) {
+        if (argc < 5) {
+            Jim_WrongNumArgs(interp, 2, argv, "varName key ?key ...? value");
+            return JIM_ERR;
+        }
+        return Jim_SetDictKeysVector(interp, argv[2], argv+3, argc-4,
+                    argv[argc-1]);
+    } else if (option == OPT_UNSET) {
+        if (argc < 4) {
+            Jim_WrongNumArgs(interp, 2, argv, "varName key ?key ...?");
+            return JIM_ERR;
+        }
+        return Jim_SetDictKeysVector(interp, argv[2], argv+3, argc-3,
+                    NULL);
+    } else if (option == OPT_EXIST) {
+        Jim_Obj *objPtr;
+        int exists;
+
+        if (Jim_DictKeysVector(interp, argv[2], argv+3, argc-3, &objPtr,
+                JIM_ERRMSG) == JIM_OK)
+            exists = 1;
+        else
+            exists = 0;
+        Jim_SetResult(interp, Jim_NewIntObj(interp, exists));
+        return JIM_OK;
+    } else {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+            "bad option \"", Jim_GetString(argv[1], NULL), "\":",
+            " must be create, get, set", NULL);
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
+/* [load] */
+static int Jim_LoadCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "libaryFile");
+        return JIM_ERR;
+    }
+    return Jim_LoadLibrary(interp, Jim_GetString(argv[1], NULL));
+}
+
+/* [subst] */
+static int Jim_SubstCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int i, flags = 0;
+    Jim_Obj *objPtr;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv,
+            "?-nobackslashes? ?-nocommands? ?-novariables? string");
+        return JIM_ERR;
+    }
+    i = argc-2;
+    while(i--) {
+        if (Jim_CompareStringImmediate(interp, argv[i+1],
+                    "-nobackslashes"))
+            flags |= JIM_SUBST_NOESC;
+        else if (Jim_CompareStringImmediate(interp, argv[i+1],
+                    "-novariables"))
+            flags |= JIM_SUBST_NOVAR;
+        else if (Jim_CompareStringImmediate(interp, argv[i+1],
+                    "-nocommands"))
+            flags |= JIM_SUBST_NOCMD;
+        else {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "bad option \"", Jim_GetString(argv[i+1], NULL),
+                "\": must be -nobackslashes, -nocommands, or "
+                "-novariables", NULL);
+            return JIM_ERR;
+        }
+    }
+    if (Jim_SubstObj(interp, argv[argc-1], &objPtr, flags) != JIM_OK)
+        return JIM_ERR;
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+/* [info] */
+static int Jim_InfoCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int cmd, result = JIM_OK;
+    static const char *commands[] = {
+        "body", "commands", "exists", "globals", "level", "locals",
+        "vars", "version", "complete", "args", NULL
+    };
+    enum {INFO_BODY, INFO_COMMANDS, INFO_EXISTS, INFO_GLOBALS, INFO_LEVEL,
+          INFO_LOCALS, INFO_VARS, INFO_VERSION, INFO_COMPLETE, INFO_ARGS};
+    
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "command ?args ...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetEnum(interp, argv[1], commands, &cmd, "command", JIM_ERRMSG)
+        != JIM_OK) {
+        return JIM_ERR;
+    }
+    
+    if (cmd == INFO_COMMANDS) {
+        if (argc != 2 && argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "?pattern?");
+            return JIM_ERR;
+        }
+        if (argc == 3)
+            Jim_SetResult(interp,JimCommandsList(interp, argv[2]));
+        else
+            Jim_SetResult(interp, JimCommandsList(interp, NULL));
+    } else if (cmd == INFO_EXISTS) {
+        Jim_Obj *exists;
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "varName");
+            return JIM_ERR;
+        }
+        exists = Jim_GetVariable(interp, argv[2], 0);
+        Jim_SetResult(interp, Jim_NewIntObj(interp, exists != 0));
+    } else if (cmd == INFO_GLOBALS || cmd == INFO_LOCALS || cmd == INFO_VARS) {
+        int mode;
+        switch (cmd) {
+            case INFO_GLOBALS: mode = JIM_VARLIST_GLOBALS; break;
+            case INFO_LOCALS:  mode = JIM_VARLIST_LOCALS; break;
+            case INFO_VARS:    mode = JIM_VARLIST_VARS; break;
+            default: mode = 0; /* avoid warning */; break;
+        }
+        if (argc != 2 && argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "?pattern?");
+            return JIM_ERR;
+        }
+        if (argc == 3)
+            Jim_SetResult(interp,JimVariablesList(interp, argv[2], mode));
+        else
+            Jim_SetResult(interp, JimVariablesList(interp, NULL, mode));
+    } else if (cmd == INFO_LEVEL) {
+        Jim_Obj *objPtr;
+        switch (argc) {
+            case 2:
+                Jim_SetResult(interp,
+                              Jim_NewIntObj(interp, interp->numLevels));
+                break;
+            case 3:
+                if (JimInfoLevel(interp, argv[2], &objPtr) != JIM_OK)
+                    return JIM_ERR;
+                Jim_SetResult(interp, objPtr);
+                break;
+            default:
+                Jim_WrongNumArgs(interp, 2, argv, "?levelNum?");
+                return JIM_ERR;
+        }
+    } else if (cmd == INFO_BODY || cmd == INFO_ARGS) {
+        Jim_Cmd *cmdPtr;
+
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "procname");
+            return JIM_ERR;
+        }
+        if ((cmdPtr = Jim_GetCommand(interp, argv[2], JIM_ERRMSG)) == NULL)
+            return JIM_ERR;
+        if (cmdPtr->cmdProc != NULL) {
+            Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+            Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "command \"", Jim_GetString(argv[2], NULL),
+                "\" is not a procedure", NULL);
+            return JIM_ERR;
+        }
+        if (cmd == INFO_BODY)
+            Jim_SetResult(interp, cmdPtr->bodyObjPtr);
+        else
+            Jim_SetResult(interp, cmdPtr->argListObjPtr);
+    } else if (cmd == INFO_VERSION) {
+        char buf[(JIM_INTEGER_SPACE * 2) + 1];
+        sprintf(buf, "%d.%d", 
+                JIM_VERSION / 100, JIM_VERSION % 100);
+        Jim_SetResultString(interp, buf, -1);
+    } else if (cmd == INFO_COMPLETE) {
+        const char *s;
+        int len;
+
+        if (argc != 3) {
+            Jim_WrongNumArgs(interp, 2, argv, "script");
+            return JIM_ERR;
+        }
+        s = Jim_GetString(argv[2], &len);
+        Jim_SetResult(interp,
+                Jim_NewIntObj(interp, Jim_ScriptIsComplete(s, len, NULL)));
+    }
+    return result;
+}
+
+/* [split] */
+static int Jim_SplitCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    const char *str, *splitChars, *noMatchStart;
+    int splitLen, strLen, i;
+    Jim_Obj *resObjPtr;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "string ?splitChars?");
+        return JIM_ERR;
+    }
+    /* Init */
+    if (argc == 2) {
+        splitChars = " \n\t\r";
+        splitLen = 4;
+    } else {
+        splitChars = Jim_GetString(argv[2], &splitLen);
+    }
+    str = Jim_GetString(argv[1], &strLen);
+    if (!strLen) return JIM_OK;
+    noMatchStart = str;
+    resObjPtr = Jim_NewListObj(interp, NULL, 0);
+    /* Split */
+    if (splitLen) {
+        while (strLen) {
+            for (i = 0; i < splitLen; i++) {
+                if (*str == splitChars[i]) {
+                    Jim_Obj *objPtr;
+
+                    objPtr = Jim_NewStringObj(interp, noMatchStart,
+                            (str-noMatchStart));
+                    Jim_ListAppendElement(interp, resObjPtr, objPtr);
+                    noMatchStart = str+1;
+                    break;
+                }
+            }
+            str ++;
+            strLen --;
+        }
+        Jim_ListAppendElement(interp, resObjPtr,
+                Jim_NewStringObj(interp, noMatchStart, (str-noMatchStart)));
+    } else {
+        /* This handles the special case of splitchars eq {}. This
+         * is trivial but we want to perform object sharing as Tcl does. */
+        Jim_Obj *objCache[256];
+        const unsigned char *u = (unsigned char*) str;
+        memset(objCache, 0, sizeof(objCache));
+        for (i = 0; i < strLen; i++) {
+            int c = u[i];
+            
+            if (objCache[c] == NULL)
+                objCache[c] = Jim_NewStringObj(interp, (char*)u+i, 1);
+            Jim_ListAppendElement(interp, resObjPtr, objCache[c]);
+        }
+    }
+    Jim_SetResult(interp, resObjPtr);
+    return JIM_OK;
+}
+
+/* [join] */
+static int Jim_JoinCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    const char *joinStr;
+    int joinStrLen, i, listLen;
+    Jim_Obj *resObjPtr;
+
+    if (argc != 2 && argc != 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "list ?joinString?");
+        return JIM_ERR;
+    }
+    /* Init */
+    if (argc == 2) {
+        joinStr = " ";
+        joinStrLen = 1;
+    } else {
+        joinStr = Jim_GetString(argv[2], &joinStrLen);
+    }
+    Jim_ListLength(interp, argv[1], &listLen);
+    resObjPtr = Jim_NewStringObj(interp, NULL, 0);
+    /* Split */
+    for (i = 0; i < listLen; i++) {
+        Jim_Obj *objPtr;
+
+        Jim_ListIndex(interp, argv[1], i, &objPtr, JIM_NONE);
+        Jim_AppendObj(interp, resObjPtr, objPtr);
+        if (i+1 != listLen) {
+            Jim_AppendString(interp, resObjPtr, joinStr, joinStrLen);
+        }
+    }
+    Jim_SetResult(interp, resObjPtr);
+    return JIM_OK;
+}
+
+/* [format] */
+static int Jim_FormatCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "formatString ?arg arg ...?");
+        return JIM_ERR;
+    }
+    objPtr = Jim_FormatString(interp, argv[1], argc-2, argv+2);
+    if (objPtr == NULL)
+        return JIM_ERR;
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+/* [scan] */
+static int Jim_ScanCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *listPtr, **outVec;
+    int outc, i, count = 0;
+
+    if (argc < 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "string formatString ?varName ...?");
+        return JIM_ERR;
+    } 
+    if (argv[2]->typePtr != &scanFmtStringObjType)
+        SetScanFmtFromAny(interp, argv[2]);
+    if (FormatGetError(argv[2]) != 0) {
+        Jim_SetResultString(interp, FormatGetError(argv[2]), -1);
+        return JIM_ERR;
+    }
+    if (argc > 3) {
+        int maxPos = FormatGetMaxPos(argv[2]);
+        int count = FormatGetCnvCount(argv[2]);
+        if (maxPos > argc-3) {
+            Jim_SetResultString(interp, "\"%n$\" argument index out of range", -1);
+            return JIM_ERR;
+        } else if (count != 0 && count < argc-3) {
+            Jim_SetResultString(interp, "variable is not assigned by any "
+                "conversion specifiers", -1);
+            return JIM_ERR;
+        } else if (count > argc-3) {
+            Jim_SetResultString(interp, "different numbers of variable names and "
+                "field specifiers", -1);
+            return JIM_ERR;
+        }
+    } 
+    listPtr = Jim_ScanString(interp, argv[1], argv[2], JIM_ERRMSG);
+    if (listPtr == 0)
+        return JIM_ERR;
+    if (argc > 3) {
+        int len = 0;
+        if (listPtr != 0 && listPtr != (Jim_Obj*)EOF)
+            Jim_ListLength(interp, listPtr, &len);
+        if (listPtr == (Jim_Obj*)EOF || len == 0) { // XXX
+            Jim_SetResult(interp, Jim_NewIntObj(interp, -1));
+            return JIM_OK;
+        }
+        JimListGetElements(interp, listPtr, &outc, &outVec);
+        for (i = 0; i < outc; ++i) {
+            if (Jim_Length(outVec[i]) > 0) {
+                ++count;
+                if (Jim_SetVariable(interp, argv[3+i], outVec[i]) != JIM_OK)
+                    goto err;
+            }
+        }
+        Jim_FreeNewObj(interp, listPtr);
+        Jim_SetResult(interp, Jim_NewIntObj(interp, count));
+    } else {
+        if (listPtr == (Jim_Obj*)EOF) {
+            Jim_SetResult(interp, Jim_NewListObj(interp, 0, 0));
+            return JIM_OK;
+        }
+        Jim_SetResult(interp, listPtr);
+    }
+    return JIM_OK;
+err:
+    Jim_FreeNewObj(interp, listPtr);
+    return JIM_ERR;
+}
+
+/* [error] */
+static int Jim_ErrorCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "message");
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, argv[1]);
+    return JIM_ERR;
+}
+
+/* [lrange] */
+static int Jim_LrangeCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *objPtr;
+
+    if (argc != 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "list first last");
+        return JIM_ERR;
+    }
+    if ((objPtr = Jim_ListRange(interp, argv[1], argv[2], argv[3])) == NULL)
+        return JIM_ERR;
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+/* [env] */
+static int Jim_EnvCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    const char *key;
+    char *val;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "varName");
+        return JIM_ERR;
+    }
+    key = Jim_GetString(argv[1], NULL);
+    val = getenv(key);
+    if (val == NULL) {
+        Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
+        Jim_AppendStrings(interp, Jim_GetResult(interp),
+                "environment variable \"",
+                key, "\" does not exist", NULL);
+        return JIM_ERR;
+    }
+    Jim_SetResult(interp, Jim_NewStringObj(interp, val, -1));
+    return JIM_OK;
+}
+
+/* [source] */
+static int Jim_SourceCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    int retval;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "fileName");
+        return JIM_ERR;
+    }
+    retval = Jim_EvalFile(interp, Jim_GetString(argv[1], NULL));
+    if (retval == JIM_RETURN)
+        return JIM_OK;
+    return retval;
+}
+
+/* [lreverse] */
+static int Jim_LreverseCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    Jim_Obj *revObjPtr, **ele;
+    int len;
+
+    if (argc != 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "list");
+        return JIM_ERR;
+    }
+    JimListGetElements(interp, argv[1], &len, &ele);
+    len--;
+    revObjPtr = Jim_NewListObj(interp, NULL, 0);
+    while (len >= 0)
+        ListAppendElement(revObjPtr, ele[len--]);
+    Jim_SetResult(interp, revObjPtr);
+    return JIM_OK;
+}
+
+static int JimRangeLen(jim_wide start, jim_wide end, jim_wide step)
+{
+    jim_wide len;
+
+    if (step == 0) return -1;
+    if (start == end) return 0;
+    else if (step > 0 && start > end) return -1;
+    else if (step < 0 && end > start) return -1;
+    len = end-start;
+    if (len < 0) len = -len; /* abs(len) */
+    if (step < 0) step = -step; /* abs(step) */
+    len = 1 + ((len-1)/step);
+    /* We can truncate safely to INT_MAX, the range command
+     * will always return an error for a such long range
+     * because Tcl lists can't be so long. */
+    if (len > INT_MAX) len = INT_MAX;
+    return (int)((len < 0) ? -1 : len);
+}
+
+/* [range] */
+static int Jim_RangeCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    jim_wide start = 0, end, step = 1;
+    int len, i;
+    Jim_Obj *objPtr;
+
+    if (argc < 2 || argc > 4) {
+        Jim_WrongNumArgs(interp, 1, argv, "?start? end ?step?");
+        return JIM_ERR;
+    }
+    if (argc == 2) {
+        if (Jim_GetWide(interp, argv[1], &end) != JIM_OK)
+            return JIM_ERR;
+    } else {
+        if (Jim_GetWide(interp, argv[1], &start) != JIM_OK ||
+            Jim_GetWide(interp, argv[2], &end) != JIM_OK)
+            return JIM_ERR;
+        if (argc == 4 && Jim_GetWide(interp, argv[3], &step) != JIM_OK)
+            return JIM_ERR;
+    }
+    if ((len = JimRangeLen(start, end, step)) == -1) {
+        Jim_SetResultString(interp, "Invalid (infinite?) range specified", -1);
+        return JIM_ERR;
+    }
+    objPtr = Jim_NewListObj(interp, NULL, 0);
+    for (i = 0; i < len; i++)
+        ListAppendElement(objPtr, Jim_NewIntObj(interp, start+i*step));
+    Jim_SetResult(interp, objPtr);
+    return JIM_OK;
+}
+
+/* [rand] */
+static int Jim_RandCoreCommand(Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv)
+{
+    jim_wide min = 0, max, len, maxMul;
+
+    if (argc < 1 || argc > 3) {
+        Jim_WrongNumArgs(interp, 1, argv, "?min? max");
+        return JIM_ERR;
+    }
+    if (argc == 1) {
+        max = JIM_WIDE_MAX;
+    } else if (argc == 2) {
+        if (Jim_GetWide(interp, argv[1], &max) != JIM_OK)
+            return JIM_ERR;
+    } else if (argc == 3) {
+        if (Jim_GetWide(interp, argv[1], &min) != JIM_OK ||
+            Jim_GetWide(interp, argv[2], &max) != JIM_OK)
+            return JIM_ERR;
+    }
+    len = max-min;
+    if (len < 0) {
+        Jim_SetResultString(interp, "Invalid arguments (max < min)", -1);
+        return JIM_ERR;
+    }
+    maxMul = JIM_WIDE_MAX - (len ? (JIM_WIDE_MAX%len) : 0);
+    while (1) {
+        jim_wide r;
+
+        JimRandomBytes(interp, &r, sizeof(jim_wide));
+        if (r < 0 || r >= maxMul) continue;
+        r = (len == 0) ? 0 : r%len;
+        Jim_SetResult(interp, Jim_NewIntObj(interp, min+r));
+        return JIM_OK;
+    }
+}
+
+/* [package] */
+static int Jim_PackageCoreCommand(Jim_Interp *interp, int argc, 
+        Jim_Obj *const *argv)
+{
+    int option;
+    const char *options[] = {
+        "require", "provide", NULL
+    };
+    enum {OPT_REQUIRE, OPT_PROVIDE};
+
+    if (argc < 2) {
+        Jim_WrongNumArgs(interp, 1, argv, "option ?arguments ...?");
+        return JIM_ERR;
+    }
+    if (Jim_GetEnum(interp, argv[1], options, &option, "option",
+                JIM_ERRMSG) != JIM_OK)
+        return JIM_ERR;
+
+    if (option == OPT_REQUIRE) {
+        int exact = 0;
+        const char *ver;
+
+        if (Jim_CompareStringImmediate(interp, argv[2], "-exact")) {
+            exact = 1;
+            argv++;
+            argc--;
+        }
+        if (argc != 3 && argc != 4) {
+            Jim_WrongNumArgs(interp, 2, argv, "?-exact? package ?version?");
+            return JIM_ERR;
+        }
+        ver = Jim_PackageRequire(interp, Jim_GetString(argv[2], NULL),
+                argc == 4 ? Jim_GetString(argv[3], NULL) : "",
+                JIM_ERRMSG);
+        if (ver == NULL)
+            return JIM_ERR;
+        Jim_SetResultString(interp, ver, -1);
+    } else if (option == OPT_PROVIDE) {
+        if (argc != 4) {
+            Jim_WrongNumArgs(interp, 2, argv, "package version");
+            return JIM_ERR;
+        }
+        return Jim_PackageProvide(interp, Jim_GetString(argv[2], NULL),
+                    Jim_GetString(argv[3], NULL), JIM_ERRMSG);
+    }
+    return JIM_OK;
+}
+
+static struct {
+    const char *name;
+    Jim_CmdProc cmdProc;
+} Jim_CoreCommandsTable[] = {
+    {"set", Jim_SetCoreCommand},
+    {"unset", Jim_UnsetCoreCommand},
+    {"puts", Jim_PutsCoreCommand},
+    {"+", Jim_AddCoreCommand},
+    {"*", Jim_MulCoreCommand},
+    {"-", Jim_SubCoreCommand},
+    {"/", Jim_DivCoreCommand},
+    {"incr", Jim_IncrCoreCommand},
+    {"while", Jim_WhileCoreCommand},
+    {"for", Jim_ForCoreCommand},
+    {"foreach", Jim_ForeachCoreCommand},
+    {"lmap", Jim_LmapCoreCommand},
+    {"if", Jim_IfCoreCommand},
+    {"switch", Jim_SwitchCoreCommand},
+    {"list", Jim_ListCoreCommand},
+    {"lindex", Jim_LindexCoreCommand},
+    {"lset", Jim_LsetCoreCommand},
+    {"llength", Jim_LlengthCoreCommand},
+    {"lappend", Jim_LappendCoreCommand},
+    {"linsert", Jim_LinsertCoreCommand},
+    {"lsort", Jim_LsortCoreCommand},
+    {"append", Jim_AppendCoreCommand},
+    {"debug", Jim_DebugCoreCommand},
+    {"eval", Jim_EvalCoreCommand},
+    {"uplevel", Jim_UplevelCoreCommand},
+    {"expr", Jim_ExprCoreCommand},
+    {"break", Jim_BreakCoreCommand},
+    {"continue", Jim_ContinueCoreCommand},
+    {"proc", Jim_ProcCoreCommand},
+    {"concat", Jim_ConcatCoreCommand},
+    {"return", Jim_ReturnCoreCommand},
+    {"upvar", Jim_UpvarCoreCommand},
+    {"global", Jim_GlobalCoreCommand},
+    {"string", Jim_StringCoreCommand},
+    {"time", Jim_TimeCoreCommand},
+    {"exit", Jim_ExitCoreCommand},
+    {"catch", Jim_CatchCoreCommand},
+    {"ref", Jim_RefCoreCommand},
+    {"getref", Jim_GetrefCoreCommand},
+    {"setref", Jim_SetrefCoreCommand},
+    {"finalize", Jim_FinalizeCoreCommand},
+    {"collect", Jim_CollectCoreCommand},
+    {"rename", Jim_RenameCoreCommand},
+    {"dict", Jim_DictCoreCommand},
+    {"load", Jim_LoadCoreCommand},
+    {"subst", Jim_SubstCoreCommand},
+    {"info", Jim_InfoCoreCommand},
+    {"split", Jim_SplitCoreCommand},
+    {"join", Jim_JoinCoreCommand},
+    {"format", Jim_FormatCoreCommand},
+    {"scan", Jim_ScanCoreCommand},
+    {"error", Jim_ErrorCoreCommand},
+    {"lrange", Jim_LrangeCoreCommand},
+    {"env", Jim_EnvCoreCommand},
+    {"source", Jim_SourceCoreCommand},
+    {"lreverse", Jim_LreverseCoreCommand},
+    {"range", Jim_RangeCoreCommand},
+    {"rand", Jim_RandCoreCommand},
+    {"package", Jim_PackageCoreCommand},
+    {"tailcall", Jim_TailcallCoreCommand},
+    {NULL, NULL},
+};
+
+/* Some Jim core command is actually a procedure written in Jim itself. */
+static void Jim_RegisterCoreProcedures(Jim_Interp *interp)
+{
+    Jim_Eval(interp, (char*)
+"proc lambda {arglist args} {\n"
+"    set name [ref {} function lambdaFinalizer]\n"
+"    uplevel 1 [list proc $name $arglist {expand}$args]\n"
+"    return $name\n"
+"}\n"
+"proc lambdaFinalizer {name val} {\n"
+"    rename $name {}\n"
+"}\n"
+    );
+}
+
+void Jim_RegisterCoreCommands(Jim_Interp *interp)
+{
+    int i = 0;
+
+    while(Jim_CoreCommandsTable[i].name != NULL) {
+        Jim_CreateCommand(interp, 
+                Jim_CoreCommandsTable[i].name,
+                Jim_CoreCommandsTable[i].cmdProc,
+                NULL, NULL);
+        i++;
+    }
+    Jim_RegisterCoreProcedures(interp);
+}
+
+/* -----------------------------------------------------------------------------
+ * Interactive prompt
+ * ---------------------------------------------------------------------------*/
+void Jim_PrintErrorMessage(Jim_Interp *interp)
+{
+    int len, i;
+
+    Jim_fprintf(interp, interp->cookie_stderr, "Runtime error, file \"%s\", line %d:" JIM_NL,
+				interp->errorFileName, interp->errorLine);
+    Jim_fprintf(interp,interp->cookie_stderr, "    %s" JIM_NL,
+            Jim_GetString(interp->result, NULL));
+    Jim_ListLength(interp, interp->stackTrace, &len);
+    for (i = len-3; i >= 0; i-= 3) {
+        Jim_Obj *objPtr;
+        const char *proc, *file, *line;
+
+        Jim_ListIndex(interp, interp->stackTrace, i, &objPtr, JIM_NONE);
+        proc = Jim_GetString(objPtr, NULL);
+        Jim_ListIndex(interp, interp->stackTrace, i+1, &objPtr,
+                JIM_NONE);
+        file = Jim_GetString(objPtr, NULL);
+        Jim_ListIndex(interp, interp->stackTrace, i+2, &objPtr,
+                JIM_NONE);
+        line = Jim_GetString(objPtr, NULL);
+		Jim_fprintf( interp, interp->cookie_stderr,
+                "In procedure '%s' called at file \"%s\", line %s" JIM_NL,
+                proc, file, line);
+    }
+}
+
+int Jim_InteractivePrompt(Jim_Interp *interp)
+{
+    int retcode = JIM_OK;
+    Jim_Obj *scriptObjPtr;
+
+    Jim_fprintf(interp,interp->cookie_stdout, "Welcome to Jim version %d.%d, "
+           "Copyright (c) 2005-8 Salvatore Sanfilippo" JIM_NL,
+           JIM_VERSION / 100, JIM_VERSION % 100);
+     Jim_SetVariableStrWithStr(interp, "jim_interactive", "1");
+    while (1) {
+        char buf[1024];
+        const char *result;
+        const char *retcodestr[] = {
+            "ok", "error", "return", "break", "continue", "eval", "exit"
+        };
+        int reslen;
+
+        if (retcode != 0) {
+            if (retcode >= 2 && retcode <= 6)
+                Jim_fprintf(interp,interp->cookie_stdout, "[%s] . ", retcodestr[retcode]);
+            else
+                Jim_fprintf(interp,interp->cookie_stdout, "[%d] . ", retcode);
+        } else
+            Jim_fprintf( interp, interp->cookie_stdout, ". ");
+        Jim_fflush( interp, interp->cookie_stdout);
+        scriptObjPtr = Jim_NewStringObj(interp, "", 0);
+        Jim_IncrRefCount(scriptObjPtr);
+        while(1) {
+            const char *str;
+            char state;
+            int len;
+
+            if ( Jim_fgets(interp, buf, 1024, interp->cookie_stdin) == NULL) {
+                Jim_DecrRefCount(interp, scriptObjPtr);
+                goto out;
+            }
+            Jim_AppendString(interp, scriptObjPtr, buf, -1);
+            str = Jim_GetString(scriptObjPtr, &len);
+            if (Jim_ScriptIsComplete(str, len, &state))
+                break;
+            Jim_fprintf( interp, interp->cookie_stdout, "%c> ", state);
+            Jim_fflush( interp, interp->cookie_stdout);
+        }
+        retcode = Jim_EvalObj(interp, scriptObjPtr);
+        Jim_DecrRefCount(interp, scriptObjPtr);
+        result = Jim_GetString(Jim_GetResult(interp), &reslen);
+        if (retcode == JIM_ERR) {
+            Jim_PrintErrorMessage(interp);
+        } else if (retcode == JIM_EXIT) {
+            exit(Jim_GetExitCode(interp));
+        } else {
+            if (reslen) {
+				Jim_fwrite( interp, result, 1, reslen, interp->cookie_stdout);
+				Jim_fprintf( interp,interp->cookie_stdout, JIM_NL);
+            }
+        }
+    }
+out:
+    return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Jim's idea of STDIO..
+ * ---------------------------------------------------------------------------*/
+
+int Jim_fprintf( Jim_Interp *interp, void *cookie, const char *fmt, ... )
+{
+	int r;
+
+	va_list ap;
+	va_start(ap,fmt);
+	r = Jim_vfprintf( interp, cookie, fmt,ap );
+	va_end(ap);
+	return r;
+}
+
+int Jim_vfprintf( Jim_Interp *interp, void *cookie, const char *fmt, va_list ap )
+{
+	if( (interp == NULL) || (interp->cb_vfprintf == NULL) ){
+		errno = ENOTSUP;
+		return -1;
+	}
+	return (*(interp->cb_vfprintf))( cookie, fmt, ap );
+}
+
+size_t Jim_fwrite( Jim_Interp *interp, const void *ptr, size_t size, size_t n, void *cookie )
+{
+	if( (interp == NULL) || (interp->cb_fwrite == NULL) ){
+		errno = ENOTSUP;
+		return 0;
+	}
+	return (*(interp->cb_fwrite))( ptr, size, n, cookie);
+}
+
+size_t Jim_fread( Jim_Interp *interp, void *ptr, size_t size, size_t n, void *cookie )
+{
+	if( (interp == NULL) || (interp->cb_fread == NULL) ){
+		errno = ENOTSUP;
+		return 0;
+	}
+	return (*(interp->cb_fread))( ptr, size, n, cookie);
+}
+
+int Jim_fflush( Jim_Interp *interp, void *cookie )
+{
+	if( (interp == NULL) || (interp->cb_fflush == NULL) ){
+		/* pretend all is well */
+		return 0;
+	}
+	return (*(interp->cb_fflush))( cookie );
+}
+
+char* Jim_fgets( Jim_Interp *interp, char *s, int size, void *cookie )
+{
+	if( (interp == NULL) || (interp->cb_fgets == NULL) ){
+		errno = ENOTSUP;
+		return NULL;
+	}
+	return (*(interp->cb_fgets))( s, size, cookie );
+}
diff --git a/src/helper/jim.h b/src/helper/jim.h
new file mode 100644
index 0000000..9e9c7dc
--- /dev/null
+++ b/src/helper/jim.h
@@ -0,0 +1,985 @@
+/* Jim - A small embeddable Tcl interpreter
+ * Copyright 2005 Salvatore Sanfilippo <antirez@invece.org>
+ * Copyright 2005 Clemens Hintze <c.hintze@gmx.net>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * A copy of the license is also included in the source distribution
+ * of Jim, as a TXT file name called LICENSE.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __JIM__H
+#define __JIM__H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <time.h>
+#include <limits.h>
+#include <stdio.h>  /* for the FILE typedef definition */
+#include <stdlib.h> /* In order to export the Jim_Free() macro */
+
+/* -----------------------------------------------------------------------------
+* Some /very/ old compiler maybe do not know how to
+* handle 'const'. They even do not know, how to ignore
+* it. For those compiler it may be better to compile with
+* define JIM_NO_CONST activated
+* ---------------------------------------------------------------------------*/
+
+#ifdef JIM_NO_CONST
+#  define const
+#endif
+
+/* -----------------------------------------------------------------------------
+ * System configuration
+ * For most modern systems, you can leave the default.
+ * For embedded systems some change may be required.
+ * ---------------------------------------------------------------------------*/
+
+#define HAVE_LONG_LONG
+
+/* -----------------------------------------------------------------------------
+ * Compiler specific fixes.
+ * ---------------------------------------------------------------------------*/
+
+/* MSC has _stricmp instead of strcasecmp */
+#ifdef _MSC_VER
+#  define strcasecmp _stricmp
+#endif /* _MSC_VER */
+
+/* Long Long type and related issues */
+#ifdef HAVE_LONG_LONG
+#  ifdef _MSC_VER /* MSC compiler */
+#    define jim_wide _int64
+#    ifndef LLONG_MAX
+#      define LLONG_MAX    9223372036854775807I64
+#    endif
+#    ifndef LLONG_MIN
+#      define LLONG_MIN    (-LLONG_MAX - 1I64)
+#    endif
+#    define JIM_WIDE_MIN LLONG_MIN
+#    define JIM_WIDE_MAX LLONG_MAX
+#  else /* Other compilers (mainly GCC) */
+#    define jim_wide long long
+#    ifndef LLONG_MAX
+#      define LLONG_MAX    9223372036854775807LL
+#    endif
+#    ifndef LLONG_MIN
+#      define LLONG_MIN    (-LLONG_MAX - 1LL)
+#    endif
+#    define JIM_WIDE_MIN LLONG_MIN
+#    define JIM_WIDE_MAX LLONG_MAX
+#  endif
+#else
+#  define jim_wide long
+#  define JIM_WIDE_MIN LONG_MIN
+#  define JIM_WIDE_MAX LONG_MAX
+#endif
+
+/* -----------------------------------------------------------------------------
+ * LIBC specific fixes
+ * ---------------------------------------------------------------------------*/
+
+#ifdef HAVE_LONG_LONG
+# if defined(_MSC_VER) || defined(__MSVCRT__)
+#    define JIM_WIDE_MODIFIER "I64d"
+# else
+#    define JIM_WIDE_MODIFIER "lld"
+# endif
+#else
+#    define JIM_WIDE_MODIFIER "ld"
+#endif
+
+/* -----------------------------------------------------------------------------
+ * Exported defines
+ * ---------------------------------------------------------------------------*/
+
+/* Jim version numbering: every version of jim is marked with a
+ * successive integer number. This is version 0. The first
+ * stable version will be 1, then 2, 3, and so on. */
+#define JIM_VERSION 51
+
+#define JIM_OK 0
+#define JIM_ERR 1
+#define JIM_RETURN 2
+#define JIM_BREAK 3
+#define JIM_CONTINUE 4
+#define JIM_EVAL 5
+#define JIM_EXIT 6
+#define JIM_MAX_NESTING_DEPTH 10000 /* default max nesting depth */
+
+/* Some function get an integer argument with flags to change
+ * the behaviour. */
+#define JIM_NONE 0    /* no flags set */
+#define JIM_ERRMSG 1    /* set an error message in the interpreter. */
+
+/* Flags for Jim_SubstObj() */
+#define JIM_SUBST_NOVAR 1 /* don't perform variables substitutions */
+#define JIM_SUBST_NOCMD 2 /* don't perform command substitutions */
+#define JIM_SUBST_NOESC 4 /* don't perform escapes substitutions */
+
+/* Unused arguments generate annoying warnings... */
+#define JIM_NOTUSED(V) ((void) V)
+
+/* Flags used by API calls getting a 'nocase' argument. */
+#define JIM_CASESENS    0   /* case sensitive */
+#define JIM_NOCASE      1   /* no case */
+
+/* Filesystem related */
+#define JIM_PATH_LEN 1024
+
+/* Newline, some embedded system may need -DJIM_CRLF */
+#ifdef JIM_CRLF
+#define JIM_NL "\r\n"
+#else
+#define JIM_NL "\n"
+#endif
+
+#if defined(__WIN32__) || defined(_WIN32)
+#define DLLEXPORT __declspec(dllexport)
+#define DLLIMPORT __declspec(dllimport)
+#else
+#define DLLEXPORT
+#define DLLIMPORT
+#endif
+
+/* -----------------------------------------------------------------------------
+ * Stack
+ * ---------------------------------------------------------------------------*/
+
+typedef struct Jim_Stack {
+    int len;
+    int maxlen;
+    void **vector;
+} Jim_Stack;
+
+/* -----------------------------------------------------------------------------
+ * Hash table
+ * ---------------------------------------------------------------------------*/
+
+typedef struct Jim_HashEntry {
+    const void *key;
+    void *val;
+    struct Jim_HashEntry *next;
+} Jim_HashEntry;
+
+typedef struct Jim_HashTableType {
+    unsigned int (*hashFunction)(const void *key);
+    const void *(*keyDup)(void *privdata, const void *key);
+    void *(*valDup)(void *privdata, const void *obj);
+    int (*keyCompare)(void *privdata, const void *key1, const void *key2);
+    void (*keyDestructor)(void *privdata, const void *key);
+    void (*valDestructor)(void *privdata, void *obj);
+} Jim_HashTableType;
+
+typedef struct Jim_HashTable {
+    Jim_HashEntry **table;
+    Jim_HashTableType *type;
+    unsigned int size;
+    unsigned int sizemask;
+    unsigned int used;
+    unsigned int collisions;
+    void *privdata;
+} Jim_HashTable;
+
+typedef struct Jim_HashTableIterator {
+    Jim_HashTable *ht;
+    int index;
+    Jim_HashEntry *entry, *nextEntry;
+} Jim_HashTableIterator;
+
+/* This is the initial size of every hash table */
+#define JIM_HT_INITIAL_SIZE     16
+
+/* ------------------------------- Macros ------------------------------------*/
+#define Jim_FreeEntryVal(ht, entry) \
+    if ((ht)->type->valDestructor) \
+        (ht)->type->valDestructor((ht)->privdata, (entry)->val)
+
+#define Jim_SetHashVal(ht, entry, _val_) do { \
+    if ((ht)->type->valDup) \
+        entry->val = (ht)->type->valDup((ht)->privdata, _val_); \
+    else \
+        entry->val = (_val_); \
+} while(0)
+
+#define Jim_FreeEntryKey(ht, entry) \
+    if ((ht)->type->keyDestructor) \
+        (ht)->type->keyDestructor((ht)->privdata, (entry)->key)
+
+#define Jim_SetHashKey(ht, entry, _key_) do { \
+    if ((ht)->type->keyDup) \
+        entry->key = (ht)->type->keyDup((ht)->privdata, _key_); \
+    else \
+        entry->key = (_key_); \
+} while(0)
+
+#define Jim_CompareHashKeys(ht, key1, key2) \
+    (((ht)->type->keyCompare) ? \
+        (ht)->type->keyCompare((ht)->privdata, key1, key2) : \
+        (key1) == (key2))
+
+#define Jim_HashKey(ht, key) (ht)->type->hashFunction(key)
+
+#define Jim_GetHashEntryKey(he) ((he)->key)
+#define Jim_GetHashEntryVal(he) ((he)->val)
+#define Jim_GetHashTableCollisions(ht) ((ht)->collisions)
+#define Jim_GetHashTableSize(ht) ((ht)->size)
+#define Jim_GetHashTableUsed(ht) ((ht)->used)
+
+/* -----------------------------------------------------------------------------
+ * Jim_Obj structure
+ * ---------------------------------------------------------------------------*/
+
+/* -----------------------------------------------------------------------------
+ * Jim object. This is mostly the same as Tcl_Obj itself,
+ * with the addition of the 'prev' and 'next' pointers.
+ * In Jim all the objects are stored into a linked list for GC purposes,
+ * so that it's possible to access every object living in a given interpreter
+ * sequentially. When an object is freed, it's moved into a different
+ * linked list, used as object pool.
+ *
+ * The refcount of a freed object is always -1.
+ * ---------------------------------------------------------------------------*/
+typedef struct Jim_Obj {
+    int refCount; /* reference count */
+    char *bytes; /* string representation buffer. NULL = no string repr. */
+    int length; /* number of bytes in 'bytes', not including the numterm. */
+    struct Jim_ObjType *typePtr; /* object type. */
+    /* Internal representation union */
+    union {
+        /* integer number type */
+        jim_wide wideValue;
+        /* hashed object type value */
+        int hashValue;
+        /* index type */
+        int indexValue;
+        /* return code type */
+        int returnCode;
+        /* double number type */
+        double doubleValue;
+        /* Generic pointer */
+        void *ptr;
+        /* Generic two pointers value */
+        struct {
+            void *ptr1;
+            void *ptr2;
+        } twoPtrValue;
+        /* Variable object */
+        struct {
+            unsigned jim_wide callFrameId;
+            struct Jim_Var *varPtr;
+        } varValue;
+        /* Command object */
+        struct {
+            unsigned jim_wide procEpoch;
+            struct Jim_Cmd *cmdPtr;
+        } cmdValue;
+        /* List object */
+        struct {
+            struct Jim_Obj **ele;    /* Elements vector */
+            int len;        /* Length */
+            int maxLen;        /* Allocated 'ele' length */
+        } listValue;
+        /* String type */
+        struct {
+            int maxLength;
+        } strValue;
+        /* Reference type */
+        struct {
+            jim_wide id;
+            struct Jim_Reference *refPtr;
+        } refValue;
+        /* Source type */
+        struct {
+            const char *fileName;
+            int lineNumber;
+        } sourceValue;
+        /* Dict substitution type */
+        struct {
+            struct Jim_Obj *varNameObjPtr;
+            struct Jim_Obj *indexObjPtr;
+        } dictSubstValue;
+        /* tagged binary type */
+        struct {
+            unsigned char *data;
+            size_t         len;
+        } binaryValue;
+    } internalRep;
+    /* This are 8 or 16 bytes more for every object
+     * but this is required for efficient garbage collection
+     * of Jim references. */
+    struct Jim_Obj *prevObjPtr; /* pointer to the prev object. */
+    struct Jim_Obj *nextObjPtr; /* pointer to the next object. */
+} Jim_Obj;
+
+/* Jim_Obj related macros */
+#define Jim_IncrRefCount(objPtr) \
+    ++(objPtr)->refCount
+#define Jim_DecrRefCount(interp, objPtr) \
+    if (--(objPtr)->refCount <= 0) Jim_FreeObj(interp, objPtr)
+#define Jim_IsShared(objPtr) \
+    ((objPtr)->refCount > 1)
+
+/* This macro is used when we allocate a new object using
+ * Jim_New...Obj(), but for some error we need to destroy it.
+ * Instead to use Jim_IncrRefCount() + Jim_DecrRefCount() we
+ * can just call Jim_FreeNewObj. To call Jim_Free directly
+ * seems too raw, the object handling may change and we want
+ * that Jim_FreeNewObj() can be called only against objects
+ * that are belived to have refcount == 0. */
+#define Jim_FreeNewObj Jim_FreeObj
+
+/* Free the internal representation of the object. */
+#define Jim_FreeIntRep(i,o) \
+    if ((o)->typePtr && (o)->typePtr->freeIntRepProc) \
+        (o)->typePtr->freeIntRepProc(i, o)
+
+/* Get the internal representation pointer */
+#define Jim_GetIntRepPtr(o) (o)->internalRep.ptr
+
+/* Set the internal representation pointer */
+#define Jim_SetIntRepPtr(o, p) \
+    (o)->internalRep.ptr = (p)
+
+/* The object type structure.
+ * There are four methods.
+ *
+ * - FreeIntRep is used to free the internal representation of the object.
+ *   Can be NULL if there is nothing to free.
+ * - DupIntRep is used to duplicate the internal representation of the object.
+ *   If NULL, when an object is duplicated, the internalRep union is
+ *   directly copied from an object to another.
+ *   Note that it's up to the caller to free the old internal repr of the
+ *   object before to call the Dup method.
+ * - UpdateString is used to create the string from the internal repr.
+ * - setFromAny is used to convert the current object into one of this type.
+ */
+
+struct Jim_Interp;
+
+typedef void (Jim_FreeInternalRepProc)(struct Jim_Interp *interp,
+        struct Jim_Obj *objPtr);
+typedef void (Jim_DupInternalRepProc)(struct Jim_Interp *interp,
+        struct Jim_Obj *srcPtr, Jim_Obj *dupPtr);
+typedef void (Jim_UpdateStringProc)(struct Jim_Obj *objPtr);
+    
+typedef struct Jim_ObjType {
+    const char *name; /* The name of the type. */
+    Jim_FreeInternalRepProc *freeIntRepProc;
+    Jim_DupInternalRepProc *dupIntRepProc;
+    Jim_UpdateStringProc *updateStringProc;
+    int flags;
+} Jim_ObjType;
+
+/* Jim_ObjType flags */
+#define JIM_TYPE_NONE 0        /* No flags */
+#define JIM_TYPE_REFERENCES 1    /* The object may contain referneces. */
+
+/* Starting from 1 << 20 flags are reserved for private uses of
+ * different calls. This way the same 'flags' argument may be used
+ * to pass both global flags and private flags. */
+#define JIM_PRIV_FLAG_SHIFT 20
+
+/* -----------------------------------------------------------------------------
+ * Call frame, vars, commands structures
+ * ---------------------------------------------------------------------------*/
+
+/* Call frame */
+typedef struct Jim_CallFrame {
+    unsigned jim_wide id; /* Call Frame ID. Used for caching. */
+    struct Jim_HashTable vars; /* Where local vars are stored */
+    struct Jim_HashTable *staticVars; /* pointer to procedure static vars */
+    struct Jim_CallFrame *parentCallFrame;
+    Jim_Obj *const *argv; /* object vector of the current procedure call. */
+    int argc; /* number of args of the current procedure call. */
+    Jim_Obj *procArgsObjPtr; /* arglist object of the running procedure */
+    Jim_Obj *procBodyObjPtr; /* body object of the running procedure */
+    struct Jim_CallFrame *nextFramePtr;
+} Jim_CallFrame;
+
+/* The var structure. It just holds the pointer of the referenced
+ * object. If linkFramePtr is not NULL the variable is a link
+ * to a variable of name store on objPtr living on the given callframe
+ * (this happens when the [global] or [upvar] command is used).
+ * The interp in order to always know how to free the Jim_Obj associated
+ * with a given variable because In Jim objects memory managment is
+ * bound to interpreters. */
+typedef struct Jim_Var {
+    Jim_Obj *objPtr;
+    struct Jim_CallFrame *linkFramePtr;
+} Jim_Var;
+    
+/* The cmd structure. */
+typedef int (*Jim_CmdProc)(struct Jim_Interp *interp, int argc,
+    Jim_Obj *const *argv);
+typedef void (*Jim_DelCmdProc)(struct Jim_Interp *interp, void *privData);
+
+/* A command is implemented in C if funcPtr is != NULL, otherwise
+ * it's a Tcl procedure with the arglist and body represented by the
+ * two objects referenced by arglistObjPtr and bodyoObjPtr. */
+typedef struct Jim_Cmd {
+    Jim_CmdProc cmdProc; /* Not-NULL for a C command. */
+    void *privData; /* Only used for C commands. */
+    Jim_DelCmdProc delProc; /* Called when the command is deleted if != NULL */
+    Jim_Obj *argListObjPtr;
+    Jim_Obj *bodyObjPtr;
+    Jim_HashTable *staticVars; /* Static vars hash table. NULL if no statics. */
+    int arityMin; /* Min number of arguments. */
+    int arityMax; /* Max number of arguments. */
+} Jim_Cmd;
+
+/* Pseudo Random Number Generator State structure */
+typedef struct Jim_PrngState {
+    unsigned char sbox[256];
+    unsigned int i, j;
+} Jim_PrngState;
+
+/* -----------------------------------------------------------------------------
+ * Jim interpreter structure.
+ * Fields similar to the real Tcl interpreter structure have the same names.
+ * ---------------------------------------------------------------------------*/
+typedef struct Jim_Interp {
+    Jim_Obj *result; /* object returned by the last command called. */
+    int errorLine; /* Error line where an error occurred. */
+    const char *errorFileName; /* Error file where an error occurred. */
+    int numLevels; /* Number of current nested calls. */
+    int maxNestingDepth; /* Used for infinite loop detection. */
+    int returnCode; /* Completion code to return on JIM_RETURN. */
+    int exitCode; /* Code to return to the OS on JIM_EXIT. */
+    Jim_CallFrame *framePtr; /* Pointer to the current call frame */
+    Jim_CallFrame *topFramePtr; /* toplevel/global frame pointer. */
+    struct Jim_HashTable commands; /* Commands hash table */
+    unsigned jim_wide procEpoch; /* Incremented every time the result
+                of procedures names lookup caching
+                may no longer be valid. */
+    unsigned jim_wide callFrameEpoch; /* Incremented every time a new
+                callframe is created. This id is used for the
+                'ID' field contained in the Jim_CallFrame
+                structure. */
+    Jim_Obj *liveList; /* Linked list of all the live objects. */
+    Jim_Obj *freeList; /* Linked list of all the unused objects. */
+    const char *scriptFileName; /* File name of the script currently in execution. */
+    Jim_Obj *emptyObj; /* Shared empty string object. */
+    unsigned jim_wide referenceNextId; /* Next id for reference. */
+    struct Jim_HashTable references; /* References hash table. */
+    jim_wide lastCollectId; /* reference max Id of the last GC
+                execution. It's set to -1 while the collection
+                is running as sentinel to avoid to recursive
+                calls via the [collect] command inside
+                finalizers. */
+    time_t lastCollectTime; /* unix time of the last GC execution */
+    struct Jim_HashTable sharedStrings; /* Shared Strings hash table */
+    Jim_Obj *stackTrace; /* Stack trace object. */
+    Jim_Obj *unknown; /* Unknown command cache */
+    int errorFlag; /* Set if an error occurred during execution. */
+    int evalRetcodeLevel; /* Level where the last return with code JIM_EVAL
+                             happened. */
+    void *cmdPrivData; /* Used to pass the private data pointer to
+                  a command. It is set to what the user specified
+                  via Jim_CreateCommand(). */
+
+    struct Jim_HashTable stub; /* Stub hash table to export API */
+    /* Jim_GetApi() function pointer, used to bootstrap the STUB table */
+    int (*getApiFuncPtr)(struct Jim_Interp *, const char *, void *);
+    struct Jim_CallFrame *freeFramesList; /* list of CallFrame structures. */
+    struct Jim_HashTable assocData; /* per-interp storage for use by packages */
+    Jim_PrngState *prngState; /* per interpreter Random Number Gen. state. */
+    struct Jim_HashTable packages; /* Provided packages hash table */
+    void *cookie_stdin; /* input file pointer, 'stdin' by default */
+    void *cookie_stdout; /* output file pointer, 'stdout' by default */
+    void *cookie_stderr; /* errors file pointer, 'stderr' by default */
+    size_t (*cb_fwrite  )( const void *ptr, size_t size, size_t n, void *cookie );
+	size_t (*cb_fread   )( void *ptr, size_t size, size_t n, void *cookie );
+	int    (*cb_vfprintf)( void *cookie, const char *fmt, va_list ap );
+	int    (*cb_fflush  )( void *cookie );
+	char  *(*cb_fgets   )( char *s, int size, void *cookie );
+} Jim_Interp;
+
+/* Currently provided as macro that performs the increment.
+ * At some point may be a real function doing more work.
+ * The proc epoch is used in order to know when a command lookup
+ * cached can no longer considered valid. */
+#define Jim_InterpIncrProcEpoch(i) (i)->procEpoch++
+#define Jim_SetResultString(i,s,l) Jim_SetResult(i, Jim_NewStringObj(i,s,l))
+#define Jim_SetEmptyResult(i) Jim_SetResult(i, (i)->emptyObj)
+#define Jim_GetResult(i) ((i)->result)
+#define Jim_CmdPrivData(i) ((i)->cmdPrivData)
+
+/* Note that 'o' is expanded only one time inside this macro,
+ * so it's safe to use side effects. */
+#define Jim_SetResult(i,o) do {     \
+    Jim_Obj *_resultObjPtr_ = (o);    \
+    Jim_IncrRefCount(_resultObjPtr_); \
+    Jim_DecrRefCount(i,(i)->result);  \
+    (i)->result = _resultObjPtr_;     \
+} while(0)
+
+/* Reference structure. The interpreter pointer is held within privdata member in HashTable */
+#define JIM_REFERENCE_TAGLEN 7 /* The tag is fixed-length, because the reference
+                                  string representation must be fixed length. */
+typedef struct Jim_Reference {
+    Jim_Obj *objPtr;
+    Jim_Obj *finalizerCmdNamePtr;
+    char tag[JIM_REFERENCE_TAGLEN+1];
+} Jim_Reference;
+
+/* -----------------------------------------------------------------------------
+ * Exported API prototypes.
+ * ---------------------------------------------------------------------------*/
+
+/* Macros that are common for extensions and core. */
+#define Jim_NewEmptyStringObj(i) Jim_NewStringObj(i, "", 0)
+
+/* The core includes real prototypes, extensions instead
+ * include a global function pointer for every function exported.
+ * Once the extension calls Jim_InitExtension(), the global
+ * functon pointers are set to the value of the STUB table
+ * contained in the Jim_Interp structure.
+ *
+ * This makes Jim able to load extensions even if it is statically
+ * linked itself, and to load extensions compiled with different
+ * versions of Jim (as long as the API is still compatible.) */
+
+/* Macros are common for core and extensions */
+#define Jim_FreeHashTableIterator(iter) Jim_Free(iter)
+
+#ifndef __JIM_CORE__
+# if defined JIM_EXTENSION || defined JIM_EMBEDDED
+#  define JIM_API(x) (*x)
+#  define JIM_STATIC
+# else
+#  define JIM_API(x) (*x)
+#  define JIM_STATIC extern
+# endif
+#else
+# define JIM_API(x) x
+# if defined(BUILD_Jim)
+#   define JIM_STATIC DLLEXPORT
+# else
+#   define JIM_STATIC static
+# endif
+#endif /* __JIM_CORE__ */
+
+/* Memory allocation */
+JIM_STATIC void * JIM_API(Jim_Alloc) (int size);
+JIM_STATIC void JIM_API(Jim_Free) (void *ptr);
+JIM_STATIC char * JIM_API(Jim_StrDup) (const char *s);
+
+/* evaluation */
+JIM_STATIC int JIM_API(Jim_Eval)(Jim_Interp *interp, const char *script);
+JIM_STATIC int JIM_API(Jim_EvalGlobal)(Jim_Interp *interp, const char *script);
+JIM_STATIC int JIM_API(Jim_EvalFile)(Jim_Interp *interp, const char *filename);
+JIM_STATIC int JIM_API(Jim_EvalObj) (Jim_Interp *interp, Jim_Obj *scriptObjPtr);
+JIM_STATIC int JIM_API(Jim_EvalObjBackground) (Jim_Interp *interp,
+        Jim_Obj *scriptObjPtr);
+JIM_STATIC int JIM_API(Jim_EvalObjVector) (Jim_Interp *interp, int objc,
+        Jim_Obj *const *objv);
+JIM_STATIC int JIM_API(Jim_SubstObj) (Jim_Interp *interp, Jim_Obj *substObjPtr,
+        Jim_Obj **resObjPtrPtr, int flags);
+
+/* stack */
+JIM_STATIC void JIM_API(Jim_InitStack)(Jim_Stack *stack);
+JIM_STATIC void JIM_API(Jim_FreeStack)(Jim_Stack *stack);
+JIM_STATIC int JIM_API(Jim_StackLen)(Jim_Stack *stack);
+JIM_STATIC void JIM_API(Jim_StackPush)(Jim_Stack *stack, void *element);
+JIM_STATIC void * JIM_API(Jim_StackPop)(Jim_Stack *stack);
+JIM_STATIC void * JIM_API(Jim_StackPeek)(Jim_Stack *stack);
+JIM_STATIC void JIM_API(Jim_FreeStackElements)(Jim_Stack *stack, void (*freeFunc)(void *ptr));
+
+/* hash table */
+JIM_STATIC int JIM_API(Jim_InitHashTable) (Jim_HashTable *ht,
+        Jim_HashTableType *type, void *privdata);
+JIM_STATIC int JIM_API(Jim_ExpandHashTable) (Jim_HashTable *ht,
+        unsigned int size);
+JIM_STATIC int JIM_API(Jim_AddHashEntry) (Jim_HashTable *ht, const void *key,
+        void *val);
+JIM_STATIC int JIM_API(Jim_ReplaceHashEntry) (Jim_HashTable *ht,
+        const void *key, void *val);
+JIM_STATIC int JIM_API(Jim_DeleteHashEntry) (Jim_HashTable *ht,
+        const void *key);
+JIM_STATIC int JIM_API(Jim_FreeHashTable) (Jim_HashTable *ht);
+JIM_STATIC Jim_HashEntry * JIM_API(Jim_FindHashEntry) (Jim_HashTable *ht,
+        const void *key);
+JIM_STATIC int JIM_API(Jim_ResizeHashTable) (Jim_HashTable *ht);
+JIM_STATIC Jim_HashTableIterator *JIM_API(Jim_GetHashTableIterator)
+        (Jim_HashTable *ht);
+JIM_STATIC Jim_HashEntry * JIM_API(Jim_NextHashEntry)
+        (Jim_HashTableIterator *iter);
+
+/* objects */
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewObj) (Jim_Interp *interp);
+JIM_STATIC void JIM_API(Jim_FreeObj) (Jim_Interp *interp, Jim_Obj *objPtr);
+JIM_STATIC void JIM_API(Jim_InvalidateStringRep) (Jim_Obj *objPtr);
+JIM_STATIC void JIM_API(Jim_InitStringRep) (Jim_Obj *objPtr, const char *bytes,
+        int length);
+JIM_STATIC Jim_Obj * JIM_API(Jim_DuplicateObj) (Jim_Interp *interp,
+        Jim_Obj *objPtr);
+JIM_STATIC const char * JIM_API(Jim_GetString)(Jim_Obj *objPtr,
+        int *lenPtr);
+JIM_STATIC int JIM_API(Jim_Length)(Jim_Obj *objPtr);
+
+/* string object */
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewStringObj) (Jim_Interp *interp,
+        const char *s, int len);
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewStringObjNoAlloc) (Jim_Interp *interp,
+        char *s, int len);
+JIM_STATIC void JIM_API(Jim_AppendString) (Jim_Interp *interp, Jim_Obj *objPtr,
+        const char *str, int len);
+JIM_STATIC void JIM_API(Jim_AppendObj) (Jim_Interp *interp, Jim_Obj *objPtr,
+        Jim_Obj *appendObjPtr);
+JIM_STATIC void JIM_API(Jim_AppendStrings) (Jim_Interp *interp,
+        Jim_Obj *objPtr, ...);
+JIM_STATIC int JIM_API(Jim_StringEqObj) (Jim_Obj *aObjPtr,
+        Jim_Obj *bObjPtr, int nocase);
+JIM_STATIC int JIM_API(Jim_StringMatchObj) (Jim_Obj *patternObjPtr,
+        Jim_Obj *objPtr, int nocase);
+JIM_STATIC Jim_Obj * JIM_API(Jim_StringRangeObj) (Jim_Interp *interp,
+        Jim_Obj *strObjPtr, Jim_Obj *firstObjPtr,
+        Jim_Obj *lastObjPtr);
+JIM_STATIC Jim_Obj * JIM_API(Jim_FormatString) (Jim_Interp *interp,
+        Jim_Obj *fmtObjPtr, int objc, Jim_Obj *const *objv);
+JIM_STATIC Jim_Obj * JIM_API(Jim_ScanString) (Jim_Interp *interp, Jim_Obj *strObjPtr,
+        Jim_Obj *fmtObjPtr, int flags);
+JIM_STATIC int JIM_API(Jim_CompareStringImmediate) (Jim_Interp *interp,
+        Jim_Obj *objPtr, const char *str);
+
+/* reference object */
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewReference) (Jim_Interp *interp,
+        Jim_Obj *objPtr, Jim_Obj *tagPtr, Jim_Obj *cmdNamePtr);
+JIM_STATIC Jim_Reference * JIM_API(Jim_GetReference) (Jim_Interp *interp,
+        Jim_Obj *objPtr);
+JIM_STATIC int JIM_API(Jim_SetFinalizer) (Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj *cmdNamePtr);
+JIM_STATIC int JIM_API(Jim_GetFinalizer) (Jim_Interp *interp, Jim_Obj *objPtr, Jim_Obj **cmdNamePtrPtr);
+
+/* interpreter */
+JIM_STATIC Jim_Interp * JIM_API(Jim_CreateInterp) (void);
+JIM_STATIC void JIM_API(Jim_FreeInterp) (Jim_Interp *i);
+JIM_STATIC int JIM_API(Jim_GetExitCode) (Jim_Interp *interp);
+JIM_STATIC void * JIM_API(Jim_SetStdin) (Jim_Interp *interp, void *fp);
+JIM_STATIC void * JIM_API(Jim_SetStdout) (Jim_Interp *interp, void *fp);
+JIM_STATIC void * JIM_API(Jim_SetStderr) (Jim_Interp *interp, void *fp);
+
+/* commands */
+JIM_STATIC void JIM_API(Jim_RegisterCoreCommands) (Jim_Interp *interp);
+JIM_STATIC int JIM_API(Jim_CreateCommand) (Jim_Interp *interp, 
+        const char *cmdName, Jim_CmdProc cmdProc, void *privData,
+         Jim_DelCmdProc delProc);
+JIM_STATIC int JIM_API(Jim_CreateProcedure) (Jim_Interp *interp, 
+        const char *cmdName, Jim_Obj *argListObjPtr, Jim_Obj *staticsListObjPtr,
+        Jim_Obj *bodyObjPtr, int arityMin, int arityMax);
+JIM_STATIC int JIM_API(Jim_DeleteCommand) (Jim_Interp *interp,
+        const char *cmdName);
+JIM_STATIC int JIM_API(Jim_RenameCommand) (Jim_Interp *interp, 
+        const char *oldName, const char *newName);
+JIM_STATIC Jim_Cmd * JIM_API(Jim_GetCommand) (Jim_Interp *interp,
+        Jim_Obj *objPtr, int flags);
+JIM_STATIC int JIM_API(Jim_SetVariable) (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, Jim_Obj *valObjPtr);
+JIM_STATIC int JIM_API(Jim_SetVariableStr) (Jim_Interp *interp,
+        const char *name, Jim_Obj *objPtr);
+JIM_STATIC int JIM_API(Jim_SetGlobalVariableStr) (Jim_Interp *interp,
+        const char *name, Jim_Obj *objPtr);
+JIM_STATIC int JIM_API(Jim_SetVariableStrWithStr) (Jim_Interp *interp,
+        const char *name, const char *val);
+JIM_STATIC int JIM_API(Jim_SetVariableLink) (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, Jim_Obj *targetNameObjPtr,
+        Jim_CallFrame *targetCallFrame);
+JIM_STATIC Jim_Obj * JIM_API(Jim_GetVariable) (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, int flags);
+JIM_STATIC Jim_Obj * JIM_API(Jim_GetGlobalVariable) (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, int flags);
+JIM_STATIC Jim_Obj * JIM_API(Jim_GetVariableStr) (Jim_Interp *interp,
+        const char *name, int flags);
+JIM_STATIC Jim_Obj * JIM_API(Jim_GetGlobalVariableStr) (Jim_Interp *interp,
+        const char *name, int flags);
+JIM_STATIC int JIM_API(Jim_UnsetVariable) (Jim_Interp *interp,
+        Jim_Obj *nameObjPtr, int flags);
+
+/* call frame */
+JIM_STATIC int JIM_API(Jim_GetCallFrameByLevel) (Jim_Interp *interp,
+        Jim_Obj *levelObjPtr, Jim_CallFrame **framePtrPtr,
+        int *newLevelPtr);
+
+/* garbage collection */
+JIM_STATIC int JIM_API(Jim_Collect) (Jim_Interp *interp);
+JIM_STATIC void JIM_API(Jim_CollectIfNeeded) (Jim_Interp *interp);
+
+/* index object */
+JIM_STATIC int JIM_API(Jim_GetIndex) (Jim_Interp *interp, Jim_Obj *objPtr,
+        int *indexPtr);
+
+/* list object */
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewListObj) (Jim_Interp *interp,
+        Jim_Obj *const *elements, int len);
+JIM_STATIC void JIM_API(Jim_ListInsertElements) (Jim_Interp *interp,
+        Jim_Obj *listPtr, int index, int objc, Jim_Obj *const *objVec);
+JIM_STATIC void JIM_API(Jim_ListAppendElement) (Jim_Interp *interp,
+        Jim_Obj *listPtr, Jim_Obj *objPtr);
+JIM_STATIC void JIM_API(Jim_ListAppendList) (Jim_Interp *interp,
+        Jim_Obj *listPtr, Jim_Obj *appendListPtr);
+JIM_STATIC void JIM_API(Jim_ListLength) (Jim_Interp *interp, Jim_Obj *listPtr,
+        int *intPtr);
+JIM_STATIC int JIM_API(Jim_ListIndex) (Jim_Interp *interp, Jim_Obj *listPrt,
+        int index, Jim_Obj **objPtrPtr, int seterr);
+JIM_STATIC int JIM_API(Jim_SetListIndex) (Jim_Interp *interp,
+        Jim_Obj *varNamePtr, Jim_Obj *const *indexv, int indexc,
+        Jim_Obj *newObjPtr);
+JIM_STATIC Jim_Obj * JIM_API(Jim_ConcatObj) (Jim_Interp *interp, int objc,
+        Jim_Obj *const *objv);
+
+/* dict object */
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewDictObj) (Jim_Interp *interp,
+        Jim_Obj *const *elements, int len);
+JIM_STATIC int JIM_API(Jim_DictKey) (Jim_Interp *interp, Jim_Obj *dictPtr,
+        Jim_Obj *keyPtr, Jim_Obj **objPtrPtr, int flags);
+JIM_STATIC int JIM_API(Jim_DictKeysVector) (Jim_Interp *interp,
+        Jim_Obj *dictPtr, Jim_Obj *const *keyv, int keyc,
+        Jim_Obj **objPtrPtr, int flags);
+JIM_STATIC int JIM_API(Jim_SetDictKeysVector) (Jim_Interp *interp,
+        Jim_Obj *varNamePtr, Jim_Obj *const *keyv, int keyc,
+        Jim_Obj *newObjPtr);
+
+/* return code object */
+JIM_STATIC int JIM_API(Jim_GetReturnCode) (Jim_Interp *interp, Jim_Obj *objPtr,
+        int *intPtr);
+
+/* expression object */
+JIM_STATIC int JIM_API(Jim_EvalExpression) (Jim_Interp *interp,
+        Jim_Obj *exprObjPtr, Jim_Obj **exprResultPtrPtr);
+JIM_STATIC int JIM_API(Jim_GetBoolFromExpr) (Jim_Interp *interp,
+        Jim_Obj *exprObjPtr, int *boolPtr);
+
+/* integer object */
+JIM_STATIC int JIM_API(Jim_GetWide) (Jim_Interp *interp, Jim_Obj *objPtr,
+        jim_wide *widePtr);
+JIM_STATIC int JIM_API(Jim_GetLong) (Jim_Interp *interp, Jim_Obj *objPtr,
+        long *longPtr);
+JIM_STATIC void JIM_API(Jim_SetWide) (Jim_Interp *interp, Jim_Obj *objPtr,
+        jim_wide wideValue);
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewIntObj) (Jim_Interp *interp,
+        jim_wide wideValue);
+
+/* double object */
+JIM_STATIC int JIM_API(Jim_GetDouble)(Jim_Interp *interp, Jim_Obj *objPtr,
+        double *doublePtr);
+JIM_STATIC void JIM_API(Jim_SetDouble)(Jim_Interp *interp, Jim_Obj *objPtr,
+        double doubleValue);
+JIM_STATIC Jim_Obj * JIM_API(Jim_NewDoubleObj)(Jim_Interp *interp, double doubleValue);
+
+/* shared strings */
+JIM_STATIC const char * JIM_API(Jim_GetSharedString) (Jim_Interp *interp, 
+        const char *str);
+JIM_STATIC void JIM_API(Jim_ReleaseSharedString) (Jim_Interp *interp,
+        const char *str);
+
+/* commands utilities */
+JIM_STATIC void JIM_API(Jim_WrongNumArgs) (Jim_Interp *interp, int argc,
+        Jim_Obj *const *argv, const char *msg);
+JIM_STATIC int JIM_API(Jim_GetEnum) (Jim_Interp *interp, Jim_Obj *objPtr,
+        const char **tablePtr, int *indexPtr, const char *name, int flags);
+JIM_STATIC int JIM_API(Jim_ScriptIsComplete) (const char *s, int len,
+        char *stateCharPtr);
+
+/* package utilities */
+typedef void (Jim_InterpDeleteProc)(Jim_Interp *interp, void *data);
+JIM_STATIC void * JIM_API(Jim_GetAssocData)(Jim_Interp *interp, const char *key);
+JIM_STATIC int JIM_API(Jim_SetAssocData)(Jim_Interp *interp, const char *key,
+        Jim_InterpDeleteProc *delProc, void *data);
+JIM_STATIC int JIM_API(Jim_DeleteAssocData)(Jim_Interp *interp, const char *key);
+
+/* API import/export functions */
+JIM_STATIC int JIM_API(Jim_GetApi) (Jim_Interp *interp, const char *funcname,
+        void *targetPtrPtr);
+JIM_STATIC int JIM_API(Jim_RegisterApi) (Jim_Interp *interp, 
+        const char *funcname, void *funcptr);
+
+/* Packages C API */
+JIM_STATIC int JIM_API(Jim_PackageProvide) (Jim_Interp *interp,
+        const char *name, const char *ver, int flags);
+JIM_STATIC const char * JIM_API(Jim_PackageRequire) (Jim_Interp *interp,
+        const char *name, const char *ver, int flags);
+
+/* error messages */
+JIM_STATIC void JIM_API(Jim_PrintErrorMessage) (Jim_Interp *interp);
+
+/* interactive mode */
+JIM_STATIC int JIM_API(Jim_InteractivePrompt) (Jim_Interp *interp);
+
+/* Misc */
+JIM_STATIC void JIM_API(Jim_Panic) (Jim_Interp *interp, const char *fmt, ...);
+
+/* Jim's STDIO */
+JIM_STATIC int     JIM_API( Jim_fprintf  )( Jim_Interp *interp, void *cookie, const char *fmt, ... );
+JIM_STATIC int     JIM_API( Jim_vfprintf )( Jim_Interp *interp, void *cookie, const char *fmt, va_list ap );
+JIM_STATIC size_t  JIM_API( Jim_fwrite   )( Jim_Interp *interp, const void *ptr, size_t size, size_t nmeb, void *cookie );
+JIM_STATIC size_t  JIM_API( Jim_fread    )( Jim_Interp *interp, void *ptr, size_t size, size_t nmeb, void *cookie );
+JIM_STATIC int     JIM_API( Jim_fflush   )( Jim_Interp *interp, void *cookie );
+JIM_STATIC char *  JIM_API( Jim_fgets    )( Jim_Interp *interp, char *s, int size, void *cookie );
+
+
+#undef JIM_STATIC
+#undef JIM_API
+
+#ifndef __JIM_CORE__
+
+#define JIM_GET_API(name) \
+    Jim_GetApi(interp, "Jim_" #name, ((void *)&Jim_ ## name))
+
+#if defined JIM_EXTENSION || defined JIM_EMBEDDED
+/* This must be included "inline" inside the extension */
+static void Jim_InitExtension(Jim_Interp *interp)
+{
+  Jim_GetApi = interp->getApiFuncPtr;
+
+  JIM_GET_API(Alloc);
+  JIM_GET_API(Free);
+  JIM_GET_API(Eval);
+  JIM_GET_API(EvalGlobal);
+  JIM_GET_API(EvalFile);
+  JIM_GET_API(EvalObj);
+  JIM_GET_API(EvalObjBackground);
+  JIM_GET_API(EvalObjVector);
+  JIM_GET_API(InitHashTable);
+  JIM_GET_API(ExpandHashTable);
+  JIM_GET_API(AddHashEntry);
+  JIM_GET_API(ReplaceHashEntry);
+  JIM_GET_API(DeleteHashEntry);
+  JIM_GET_API(FreeHashTable);
+  JIM_GET_API(FindHashEntry);
+  JIM_GET_API(ResizeHashTable);
+  JIM_GET_API(GetHashTableIterator);
+  JIM_GET_API(NextHashEntry);
+  JIM_GET_API(NewObj);
+  JIM_GET_API(FreeObj);
+  JIM_GET_API(InvalidateStringRep);
+  JIM_GET_API(InitStringRep);
+  JIM_GET_API(DuplicateObj);
+  JIM_GET_API(GetString);
+  JIM_GET_API(Length);
+  JIM_GET_API(InvalidateStringRep);
+  JIM_GET_API(NewStringObj);
+  JIM_GET_API(NewStringObjNoAlloc);
+  JIM_GET_API(AppendString);
+  JIM_GET_API(AppendObj);
+  JIM_GET_API(AppendStrings);
+  JIM_GET_API(StringEqObj);
+  JIM_GET_API(StringMatchObj);
+  JIM_GET_API(StringRangeObj);
+  JIM_GET_API(FormatString);
+  JIM_GET_API(ScanString);
+  JIM_GET_API(CompareStringImmediate);
+  JIM_GET_API(NewReference);
+  JIM_GET_API(GetReference);
+  JIM_GET_API(SetFinalizer);
+  JIM_GET_API(GetFinalizer);
+  JIM_GET_API(CreateInterp);
+  JIM_GET_API(FreeInterp);
+  JIM_GET_API(GetExitCode);
+  JIM_GET_API(SetStdin);
+  JIM_GET_API(SetStdout);
+  JIM_GET_API(SetStderr);
+  JIM_GET_API(CreateCommand);
+  JIM_GET_API(CreateProcedure);
+  JIM_GET_API(DeleteCommand);
+  JIM_GET_API(RenameCommand);
+  JIM_GET_API(GetCommand);
+  JIM_GET_API(SetVariable);
+  JIM_GET_API(SetVariableStr);
+  JIM_GET_API(SetGlobalVariableStr);
+  JIM_GET_API(SetVariableStrWithStr);
+  JIM_GET_API(SetVariableLink);
+  JIM_GET_API(GetVariable);
+  JIM_GET_API(GetCallFrameByLevel);
+  JIM_GET_API(Collect);
+  JIM_GET_API(CollectIfNeeded);
+  JIM_GET_API(GetIndex);
+  JIM_GET_API(NewListObj);
+  JIM_GET_API(ListInsertElements);
+  JIM_GET_API(ListAppendElement);
+  JIM_GET_API(ListAppendList);
+  JIM_GET_API(ListLength);
+  JIM_GET_API(ListIndex);
+  JIM_GET_API(SetListIndex);
+  JIM_GET_API(ConcatObj);
+  JIM_GET_API(NewDictObj);
+  JIM_GET_API(DictKey);
+  JIM_GET_API(DictKeysVector);
+  JIM_GET_API(GetIndex);
+  JIM_GET_API(GetReturnCode);
+  JIM_GET_API(EvalExpression);
+  JIM_GET_API(GetBoolFromExpr);
+  JIM_GET_API(GetWide);
+  JIM_GET_API(GetLong);
+  JIM_GET_API(SetWide);
+  JIM_GET_API(NewIntObj);
+  JIM_GET_API(GetDouble);
+  JIM_GET_API(SetDouble);
+  JIM_GET_API(NewDoubleObj);
+  JIM_GET_API(WrongNumArgs);
+  JIM_GET_API(SetDictKeysVector);
+  JIM_GET_API(SubstObj);
+  JIM_GET_API(RegisterApi);
+  JIM_GET_API(PrintErrorMessage);
+  JIM_GET_API(InteractivePrompt);
+  JIM_GET_API(RegisterCoreCommands);
+  JIM_GET_API(GetSharedString);
+  JIM_GET_API(ReleaseSharedString);
+  JIM_GET_API(Panic);
+  JIM_GET_API(StrDup);
+  JIM_GET_API(UnsetVariable);
+  JIM_GET_API(GetVariableStr);
+  JIM_GET_API(GetGlobalVariable);
+  JIM_GET_API(GetGlobalVariableStr);
+  JIM_GET_API(GetAssocData);
+  JIM_GET_API(SetAssocData);
+  JIM_GET_API(DeleteAssocData);
+  JIM_GET_API(GetEnum);
+  JIM_GET_API(ScriptIsComplete);
+  JIM_GET_API(PackageProvide);
+  JIM_GET_API(PackageRequire);
+  JIM_GET_API(InitStack);
+  JIM_GET_API(FreeStack);
+  JIM_GET_API(StackLen);
+  JIM_GET_API(StackPush);
+  JIM_GET_API(StackPop);
+  JIM_GET_API(StackPeek);
+  JIM_GET_API(FreeStackElements);
+  JIM_GET_API(fprintf  );
+  JIM_GET_API(vfprintf );
+  JIM_GET_API(fwrite   );
+  JIM_GET_API(fread    );
+  JIM_GET_API(fflush   );
+  JIM_GET_API(fgets    );
+  
+}
+#endif /* defined JIM_EXTENSION || defined JIM_EMBEDDED */
+
+#undef JIM_GET_API
+
+#ifdef JIM_EMBEDDED
+Jim_Interp *ExportedJimCreateInterp(void);
+static void Jim_InitEmbedded(void) {
+    Jim_Interp *i = ExportedJimCreateInterp();
+    Jim_InitExtension(i);
+    Jim_FreeInterp(i);
+}
+#endif /* JIM_EMBEDDED */
+#endif /* __JIM_CORE__ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __JIM__H */
diff --git a/src/helper/startup.tcl b/src/helper/startup.tcl
new file mode 100644
index 0000000..fc5f9e1
--- /dev/null
+++ b/src/helper/startup.tcl
@@ -0,0 +1,162 @@
+#
+# Defines basic Tcl procs that must be there for
+# OpenOCD to work.
+#
+# Embedded into OpenOCD executable
+#
+
+
+# Help text list. A list of command + help text pairs.
+#
+# Commands can be more than one word and they are stored
+# as "flash banks" "help text x x x"
+
+proc add_help_text {cmd cmd_help} {
+	global ocd_helptext
+	lappend ocd_helptext [list $cmd $cmd_help]
+}
+
+proc get_help_text {} {
+	global ocd_helptext
+	return $ocd_helptext
+}
+
+# Production command
+# FIX!!! need to figure out how to feed back relevant output
+# from e.g. "flash banks" command...
+proc board_produce {filename serialnumber} {
+	openocd "reset init"
+	openocd "flash write_image erase $filename [flash] bin"]]
+	openocd "verify_image $filename [flash] bin"]]
+	echo "Successfully ran production procedure"
+}
+
+proc board_test {} {
+	echo "Production test not implemented"
+}
+
+# Show flash in human readable form
+# This is an example of a human readable form of a low level fn
+proc flash_banks {} { 
+	set i 0 	
+	set result ""
+	foreach {a} [openocd_flash_banks] {
+		if {$i > 0} {
+			set result "$result\n"
+		}
+		set result [format "$result#%d: %s at 0x%08x, size 0x%08x, buswidth %d, chipwidth %d" $i $a(name) $a(base) $a(size) $a(bus_width) $a(chip_width)]
+		set i [expr $i+1]	
+	}	
+	return $result
+}
+
+# We need to explicitly redirect this to the OpenOCD command
+# as Tcl defines the exit proc
+proc exit {} {
+	openocd_throw exit
+}
+
+#Print help text for a command. Word wrap
+#help text that is too wide inside column.
+proc help {args} {
+	global ocd_helptext
+	set cmd $args
+	foreach a [lsort $ocd_helptext] {
+		if {[string length $cmd]==0||[string first $cmd $a]!=-1||[string first $cmd [lindex $a 1]]!=-1} {
+			set w 50
+			set cmdname [lindex $a 0]
+			set h [lindex $a 1]
+			set n 0
+			while 1 {
+				if {$n > [string length $h]} {break}
+				
+				set next_a [expr $n+$w]
+				if {[string length $h]>$n+$w} {
+					set xxxx [string range $h $n [expr $n+$w]]
+					for {set lastpos [expr [string length $xxxx]-1]} {$lastpos>=0&&[string compare [string range $xxxx $lastpos $lastpos] " "]!=0} {set lastpos [expr $lastpos-1]} {
+					}
+					#set next_a -1
+					if {$lastpos!=-1} {
+						set next_a [expr $lastpos+$n+1]
+					}
+				}
+				
+				
+				puts [format "%-25s %s" $cmdname [string range $h $n [expr $next_a-1]] ]
+				set cmdname ""
+				set n [expr $next_a]
+			}
+		}
+	}
+}
+
+add_help_text help "Tcl implementation of help command"
+
+
+#a bit of backwards compatibility
+proc openocd_throw {cmd} {
+	set openocd_output ""
+	eval $cmd
+	return $openocd_output
+}
+
+#a bit of backwards compatibility
+proc openocd {cmd} {
+	set openocd_output ""
+	eval $cmd
+	return $openocd_output
+}
+
+# If a fn is unknown to Tcl, we try to execute it as an OpenOCD command
+#
+# We also support two level commands. "flash banks" is translated to
+# flash_banks
+proc unknown {args} {
+	# do the name mangling from "flash banks" to "flash_banks"
+	if {[llength $args]>=2} {
+		set cmd_name "[lindex $args 0]_[lindex $args 1]"
+		# Fix?? add a check here if this is a command?
+		# we'll strip away args until we fail anyway...
+		return [eval "$cmd_name [lrange $args 2 end]"]
+	}
+	# This really is an unknown command.
+	puts "Unknown command: $args"
+}
+
+
+proc target_script {target_num eventname scriptname} {
+	if {[string compare $eventname reset]==0} {
+		set eventname post_reset
+	}
+
+	# This is the script we invoke
+	proc "target_[set eventname]_[set target_num]" {} "script $scriptname" 
+	
+}
+
+# Try flipping / and \ to find file if the filename does not
+# match the precise spelling
+proc find {filename} {
+	if {[catch {openocd_find $filename} t]==0} {
+		return $t
+	}  
+	if {[catch {openocd_find [string map {\ /} $filename} t]==0} {
+		return $t
+	}  
+	if {[catch {openocd_find [string map {/ \\} $filename} t]==0} {
+		return $t
+	}  
+	# make sure error message matches original input string
+	return [openocd_find $filename]
+}
+add_help_text find "<file> - print full path to file according to OpenOCD search rules"
+
+# Run script
+proc script {filename} {
+	source [find $filename]
+}
+
+add_help_text script "<filename> - filename of OpenOCD script (tcl) to run"
+
+add_help_text target_script "<target#> <event=reset/pre_reset/post_halt/pre_resume/gdb_program_config> <script_file>"
+