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+/* General utility routines for GDB, the GNU debugger.
+ Copyright (C) 1986 Free Software Foundation, Inc.
+
+GDB is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY. No author or distributor accepts responsibility to anyone
+for the consequences of using it or for whether it serves any
+particular purpose or works at all, unless he says so in writing.
+Refer to the GDB General Public License for full details.
+
+Everyone is granted permission to copy, modify and redistribute GDB,
+but only under the conditions described in the GDB General Public
+License. A copy of this license is supposed to have been given to you
+along with GDB so you can know your rights and responsibilities. It
+should be in a file named COPYING. Among other things, the copyright
+notice and this notice must be preserved on all copies.
+
+In other words, go ahead and share GDB, but don't try to stop
+anyone else from sharing it farther. Help stamp out software hoarding!
+*/
+
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include "defs.h"
+
+void error ();
+void fatal ();
+
+/* Chain of cleanup actions established with make_cleanup,
+ to be executed if an error happens. */
+
+static struct cleanup *cleanup_chain;
+
+/* Nonzero means a quit has been requested. */
+
+int quit_flag;
+
+/* Nonzero means quit immediately if Control-C is typed now,
+ rather than waiting until QUIT is executed. */
+
+int immediate_quit;
+
+/* Add a new cleanup to the cleanup_chain,
+ and return the previous chain pointer
+ to be passed later to do_cleanups or discard_cleanups.
+ Args are FUNCTION to clean up with, and ARG to pass to it. */
+
+struct cleanup *
+make_cleanup (function, arg)
+ void (*function) ();
+ int arg;
+{
+ register struct cleanup *new
+ = (struct cleanup *) xmalloc (sizeof (struct cleanup));
+ register struct cleanup *old_chain = cleanup_chain;
+
+ new->next = cleanup_chain;
+ new->function = function;
+ new->arg = arg;
+ cleanup_chain = new;
+
+ return old_chain;
+}
+
+/* Discard cleanups and do the actions they describe
+ until we get back to the point OLD_CHAIN in the cleanup_chain. */
+
+void
+do_cleanups (old_chain)
+ register struct cleanup *old_chain;
+{
+ register struct cleanup *ptr;
+ while ((ptr = cleanup_chain) != old_chain)
+ {
+ (*ptr->function) (ptr->arg);
+ cleanup_chain = ptr->next;
+ free (ptr);
+ }
+}
+
+/* Discard cleanups, not doing the actions they describe,
+ until we get back to the point OLD_CHAIN in the cleanup_chain. */
+
+void
+discard_cleanups (old_chain)
+ register struct cleanup *old_chain;
+{
+ register struct cleanup *ptr;
+ while ((ptr = cleanup_chain) != old_chain)
+ {
+ cleanup_chain = ptr->next;
+ free (ptr);
+ }
+}
+
+/* This function is useful for cleanups.
+ Do
+
+ foo = xmalloc (...);
+ old_chain = make_cleanup (free_current_contents, &foo);
+
+ to arrange to free the object thus allocated. */
+
+void
+free_current_contents (location)
+ char **location;
+{
+ free (*location);
+}
+
+/* Generally useful subroutines used throughout the program. */
+
+/* Like malloc but get error if no storage available. */
+
+char *
+xmalloc (size)
+ long size;
+{
+ register char *val = (char *) malloc (size);
+ if (!val)
+ fatal ("virtual memory exhausted.", 0);
+ return val;
+}
+
+/* Like realloc but get error if no storage available. */
+
+char *
+xrealloc (ptr, size)
+ char *ptr;
+ long size;
+{
+ register char *val = (char *) realloc (ptr, size);
+ if (!val)
+ fatal ("virtual memory exhausted.", 0);
+ return val;
+}
+
+/* Print the system error message for errno, and also mention STRING
+ as the file name for which the error was encountered.
+ Then return to command level. */
+
+void
+perror_with_name (string)
+ char *string;
+{
+ extern int sys_nerr;
+ extern char *sys_errlist[];
+ extern int errno;
+ char *err;
+ char *combined;
+
+ if (errno < sys_nerr)
+ err = sys_errlist[errno];
+ else
+ err = "unknown error";
+
+ combined = (char *) alloca (strlen (err) + strlen (string) + 3);
+ strcpy (combined, string);
+ strcat (combined, ": ");
+ strcat (combined, err);
+
+ error ("%s.", combined);
+}
+
+/* Print the system error message for ERRCODE, and also mention STRING
+ as the file name for which the error was encountered. */
+
+void
+print_sys_errmsg (string, errcode)
+ char *string;
+ int errcode;
+{
+ extern int sys_nerr;
+ extern char *sys_errlist[];
+ char *err;
+ char *combined;
+
+ if (errcode < sys_nerr)
+ err = sys_errlist[errcode];
+ else
+ err = "unknown error";
+
+ combined = (char *) alloca (strlen (err) + strlen (string) + 3);
+ strcpy (combined, string);
+ strcat (combined, ": ");
+ strcat (combined, err);
+
+ printf ("%s.\n", combined);
+}
+
+void
+quit ()
+{
+ fflush (stdout);
+#ifdef TIOCFLUSH
+ ioctl (fileno (stdout), TIOCFLUSH, 0);
+#endif
+ error ("Quit");
+}
+
+/* Control C comes here */
+
+void
+request_quit ()
+{
+ quit_flag = 1;
+ if (immediate_quit)
+ quit ();
+}
+
+/* Print an error message and return to command level.
+ STRING is the error message, used as a fprintf string,
+ and ARG is passed as an argument to it. */
+
+void
+error (string, arg1, arg2, arg3)
+ char *string;
+ int arg1, arg2, arg3;
+{
+ fflush (stdout);
+ fprintf (stderr, string, arg1, arg2, arg3);
+ fprintf (stderr, "\n");
+ return_to_top_level ();
+}
+
+/* Print an error message and exit reporting failure.
+ This is for a error that we cannot continue from.
+ STRING and ARG are passed to fprintf. */
+
+void
+fatal (string, arg)
+ char *string;
+ int arg;
+{
+ fprintf (stderr, "gdb: ");
+ fprintf (stderr, string, arg);
+ fprintf (stderr, "\n");
+ exit (1);
+}
+
+/* Make a copy of the string at PTR with SIZE characters
+ (and add a null character at the end in the copy).
+ Uses malloc to get the space. Returns the address of the copy. */
+
+char *
+savestring (ptr, size)
+ char *ptr;
+ int size;
+{
+ register char *p = (char *) xmalloc (size + 1);
+ bcopy (ptr, p, size);
+ p[size] = 0;
+ return p;
+}
+
+char *
+concat (s1, s2, s3)
+ char *s1, *s2, *s3;
+{
+ register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
+ register char *val = (char *) xmalloc (len);
+ strcpy (val, s1);
+ strcat (val, s2);
+ strcat (val, s3);
+ return val;
+}
+
+void
+print_spaces (n, file)
+ register int n;
+ register FILE *file;
+{
+ while (n-- > 0)
+ fputc (' ', file);
+}
+
+/* Ask user a y-or-n question and return 1 iff answer is yes.
+ Takes three args which are given to printf to print the question.
+ The first, a control string, should end in "? ".
+ It should not say how to answer, because we do that. */
+
+int
+query (ctlstr, arg1, arg2)
+ char *ctlstr;
+{
+ register int answer;
+
+ /* Automatically answer "yes" if input is not from a terminal. */
+ if (!input_from_terminal_p ())
+ return 1;
+
+ while (1)
+ {
+ printf (ctlstr, arg1, arg2);
+ printf ("(y or n) ");
+ fflush (stdout);
+ answer = fgetc (stdin);
+ clearerr (stdin); /* in case of C-d */
+ if (answer != '\n')
+ while (fgetc (stdin) != '\n') clearerr (stdin);
+ if (answer >= 'a')
+ answer -= 040;
+ if (answer == 'Y')
+ return 1;
+ if (answer == 'N')
+ return 0;
+ printf ("Please answer y or n.\n");
+ }
+}
+
+/* Parse a C escape sequence. STRING_PTR points to a variable
+ containing a pointer to the string to parse. That pointer
+ is updated past the characters we use. The value of the
+ escape sequence is returned.
+
+ A negative value means the sequence \ newline was seen,
+ which is supposed to be equivalent to nothing at all.
+
+ If \ is followed by a null character, we return a negative
+ value and leave the string pointer pointing at the null character.
+
+ If \ is followed by 000, we return 0 and leave the string pointer
+ after the zeros. A value of 0 does not mean end of string. */
+
+int
+parse_escape (string_ptr)
+ char **string_ptr;
+{
+ register int c = *(*string_ptr)++;
+ switch (c)
+ {
+ case 'a':
+ return '\a';
+ case 'b':
+ return '\b';
+ case 'e':
+ return 033;
+ case 'f':
+ return '\f';
+ case 'n':
+ return '\n';
+ case 'r':
+ return '\r';
+ case 't':
+ return '\t';
+ case 'v':
+ return '\v';
+ case '\n':
+ return -2;
+ case 0:
+ (*string_ptr)--;
+ return 0;
+ case '^':
+ c = *(*string_ptr)++;
+ if (c == '\\')
+ c = parse_escape (string_ptr);
+ if (c == '?')
+ return 0177;
+ return (c & 0200) | (c & 037);
+
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ {
+ register int i = c - '0';
+ register int count = 0;
+ while (++count < 3)
+ {
+ if ((c = *(*string_ptr)++) >= '0' && c <= '7')
+ {
+ i *= 8;
+ i += c - '0';
+ }
+ else
+ {
+ (*string_ptr)--;
+ break;
+ }
+ }
+ return i;
+ }
+ default:
+ return c;
+ }
+}
+
+void
+printchar (ch, stream)
+ unsigned char ch;
+ FILE *stream;
+{
+ register int c = ch;
+ if (c < 040 || c >= 0177)
+ {
+ if (c == '\n')
+ fprintf (stream, "\\n");
+ else if (c == '\b')
+ fprintf (stream, "\\b");
+ else if (c == '\t')
+ fprintf (stream, "\\t");
+ else if (c == '\f')
+ fprintf (stream, "\\f");
+ else if (c == '\r')
+ fprintf (stream, "\\r");
+ else if (c == 033)
+ fprintf (stream, "\\e");
+ else if (c == '\a')
+ fprintf (stream, "\\a");
+ else
+ fprintf (stream, "\\%03o", c);
+ }
+ else
+ {
+ if (c == '\\' || c == '"' || c == '\'')
+ fputc ('\\', stream);
+ fputc (c, stream);
+ }
+}
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