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author | Richard Henderson <rth@redhat.com> | 1999-05-03 07:29:11 +0000 |
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committer | Richard Henderson <rth@redhat.com> | 1999-05-03 07:29:11 +0000 |
commit | 252b5132c753830d5fd56823373aed85f2a0db63 (patch) | |
tree | 1af963bfd8d3e55167b81def4207f175eaff3a56 /libiberty/argv.c | |
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19990502 sourceware importbinu_ss_19990502
Diffstat (limited to 'libiberty/argv.c')
-rw-r--r-- | libiberty/argv.c | 390 |
1 files changed, 390 insertions, 0 deletions
diff --git a/libiberty/argv.c b/libiberty/argv.c new file mode 100644 index 0000000..85c17e9 --- /dev/null +++ b/libiberty/argv.c @@ -0,0 +1,390 @@ +/* Create and destroy argument vectors (argv's) + Copyright (C) 1992 Free Software Foundation, Inc. + Written by Fred Fish @ Cygnus Support + +This file is part of the libiberty library. +Libiberty is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public +License as published by the Free Software Foundation; either +version 2 of the License, or (at your option) any later version. + +Libiberty 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with libiberty; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + + +/* Create and destroy argument vectors. An argument vector is simply an + array of string pointers, terminated by a NULL pointer. */ + +#include "ansidecl.h" +#include "libiberty.h" + +#ifdef isspace +#undef isspace +#endif +#define isspace(ch) ((ch) == ' ' || (ch) == '\t') + +/* Routines imported from standard C runtime libraries. */ + +#ifdef __STDC__ + +#include <stddef.h> +extern void *memcpy (void *s1, const void *s2, size_t n); /* 4.11.2.1 */ +extern size_t strlen (const char *s); /* 4.11.6.3 */ +extern void *malloc (size_t size); /* 4.10.3.3 */ +extern void *realloc (void *ptr, size_t size); /* 4.10.3.4 */ +extern void free (void *ptr); /* 4.10.3.2 */ +extern char *strdup (const char *s); /* Non-ANSI */ + +#else /* !__STDC__ */ + +#if !defined _WIN32 || defined __GNUC__ +extern char *memcpy (); /* Copy memory region */ +extern int strlen (); /* Count length of string */ +extern char *malloc (); /* Standard memory allocater */ +extern char *realloc (); /* Standard memory reallocator */ +extern void free (); /* Free malloc'd memory */ +extern char *strdup (); /* Duplicate a string */ +#endif + +#endif /* __STDC__ */ + +#include "alloca-conf.h" + +#ifndef NULL +#define NULL 0 +#endif + +#ifndef EOS +#define EOS '\0' +#endif + +#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */ + + +/* + +NAME + + dupargv -- duplicate an argument vector + +SYNOPSIS + + char **dupargv (vector) + char **vector; + +DESCRIPTION + + Duplicate an argument vector. Simply scans through the + vector, duplicating each argument until the + terminating NULL is found. + +RETURNS + + Returns a pointer to the argument vector if + successful. Returns NULL if there is insufficient memory to + complete building the argument vector. + +*/ + +char ** +dupargv (argv) + char **argv; +{ + int argc; + char **copy; + + if (argv == NULL) + return NULL; + + /* the vector */ + for (argc = 0; argv[argc] != NULL; argc++); + copy = (char **) malloc ((argc + 1) * sizeof (char *)); + if (copy == NULL) + return NULL; + + /* the strings */ + for (argc = 0; argv[argc] != NULL; argc++) + { + int len = strlen (argv[argc]); + copy[argc] = malloc (sizeof (char *) * (len + 1)); + if (copy[argc] == NULL) + { + freeargv (copy); + return NULL; + } + strcpy (copy[argc], argv[argc]); + } + copy[argc] = NULL; + return copy; +} + +/* + +NAME + + freeargv -- free an argument vector + +SYNOPSIS + + void freeargv (vector) + char **vector; + +DESCRIPTION + + Free an argument vector that was built using buildargv. Simply scans + through the vector, freeing the memory for each argument until the + terminating NULL is found, and then frees the vector itself. + +RETURNS + + No value. + +*/ + +void freeargv (vector) +char **vector; +{ + register char **scan; + + if (vector != NULL) + { + for (scan = vector; *scan != NULL; scan++) + { + free (*scan); + } + free (vector); + } +} + +/* + +NAME + + buildargv -- build an argument vector from a string + +SYNOPSIS + + char **buildargv (sp) + char *sp; + +DESCRIPTION + + Given a pointer to a string, parse the string extracting fields + separated by whitespace and optionally enclosed within either single + or double quotes (which are stripped off), and build a vector of + pointers to copies of the string for each field. The input string + remains unchanged. + + All of the memory for the pointer array and copies of the string + is obtained from malloc. All of the memory can be returned to the + system with the single function call freeargv, which takes the + returned result of buildargv, as it's argument. + + The memory for the argv array is dynamically expanded as necessary. + +RETURNS + + Returns a pointer to the argument vector if successful. Returns NULL + if the input string pointer is NULL or if there is insufficient + memory to complete building the argument vector. + +NOTES + + In order to provide a working buffer for extracting arguments into, + with appropriate stripping of quotes and translation of backslash + sequences, we allocate a working buffer at least as long as the input + string. This ensures that we always have enough space in which to + work, since the extracted arg is never larger than the input string. + + If the input is a null string (as opposed to a NULL pointer), then + buildarg returns an argv that has one arg, a null string. + + Argv is always kept terminated with a NULL arg pointer, so it can + be passed to freeargv at any time, or returned, as appropriate. +*/ + +char **buildargv (input) +char *input; +{ + char *arg; + char *copybuf; + int squote = 0; + int dquote = 0; + int bsquote = 0; + int argc = 0; + int maxargc = 0; + char **argv = NULL; + char **nargv; + + if (input != NULL) + { + copybuf = (char *) alloca (strlen (input) + 1); + /* Is a do{}while to always execute the loop once. Always return an + argv, even for null strings. See NOTES above, test case below. */ + do + { + /* Pick off argv[argc] */ + while (isspace (*input)) + { + input++; + } + if ((maxargc == 0) || (argc >= (maxargc - 1))) + { + /* argv needs initialization, or expansion */ + if (argv == NULL) + { + maxargc = INITIAL_MAXARGC; + nargv = (char **) malloc (maxargc * sizeof (char *)); + } + else + { + maxargc *= 2; + nargv = (char **) realloc (argv, maxargc * sizeof (char *)); + } + if (nargv == NULL) + { + if (argv != NULL) + { + freeargv (argv); + argv = NULL; + } + break; + } + argv = nargv; + argv[argc] = NULL; + } + /* Begin scanning arg */ + arg = copybuf; + while (*input != EOS) + { + if (isspace (*input) && !squote && !dquote && !bsquote) + { + break; + } + else + { + if (bsquote) + { + bsquote = 0; + *arg++ = *input; + } + else if (*input == '\\') + { + bsquote = 1; + } + else if (squote) + { + if (*input == '\'') + { + squote = 0; + } + else + { + *arg++ = *input; + } + } + else if (dquote) + { + if (*input == '"') + { + dquote = 0; + } + else + { + *arg++ = *input; + } + } + else + { + if (*input == '\'') + { + squote = 1; + } + else if (*input == '"') + { + dquote = 1; + } + else + { + *arg++ = *input; + } + } + input++; + } + } + *arg = EOS; + argv[argc] = strdup (copybuf); + if (argv[argc] == NULL) + { + freeargv (argv); + argv = NULL; + break; + } + argc++; + argv[argc] = NULL; + + while (isspace (*input)) + { + input++; + } + } + while (*input != EOS); + } + return (argv); +} + +#ifdef MAIN + +/* Simple little test driver. */ + +static char *tests[] = +{ + "a simple command line", + "arg 'foo' is single quoted", + "arg \"bar\" is double quoted", + "arg \"foo bar\" has embedded whitespace", + "arg 'Jack said \\'hi\\'' has single quotes", + "arg 'Jack said \\\"hi\\\"' has double quotes", + "a b c d e f g h i j k l m n o p q r s t u v w x y z 1 2 3 4 5 6 7 8 9", + + /* This should be expanded into only one argument. */ + "trailing-whitespace ", + + "", + NULL +}; + +main () +{ + char **argv; + char **test; + char **targs; + + for (test = tests; *test != NULL; test++) + { + printf ("buildargv(\"%s\")\n", *test); + if ((argv = buildargv (*test)) == NULL) + { + printf ("failed!\n\n"); + } + else + { + for (targs = argv; *targs != NULL; targs++) + { + printf ("\t\"%s\"\n", *targs); + } + printf ("\n"); + } + freeargv (argv); + } + +} + +#endif /* MAIN */ |