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-rw-r--r--gdb/RCS/utils.c,v461
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-head 1.2;
-access ;
-symbols RMS-has:1.2;
-locks ; strict;
-comment @ * @;
-
-
-1.2
-date 88.01.26.05.11.12; author gnu; state Exp;
-branches ;
-next 1.1;
-
-1.1
-date 88.01.21.05.11.11; author gnu; state Exp;
-branches ;
-next ;
-
-
-desc
-@From RMS's development sources on wheaties, 20Jan88
-@
-
-
-1.2
-log
-@Avoid using TIOCFLUSH if it is not defined.
-@
-text
-@/* 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);
- }
-}
-@
-
-
-1.1
-log
-@Initial revision
-@
-text
-@d194 1
-d196 1
-@
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