1 /* General utility routines for GDB, the GNU debugger.
2 Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 GDB is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 1, or (at your option)
11 GDB is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GDB; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #include <sys/ioctl.h>
22 #include <sys/param.h>
35 extern volatile void return_to_top_level ();
36 extern volatile void exit ();
37 extern char *gdb_readline ();
38 extern char *getenv();
39 extern char *malloc();
40 extern char *realloc();
42 /* If this definition isn't overridden by the header files, assume
43 that isatty and fileno exist on this system. */
45 #define ISATTY(FP) (isatty (fileno (FP)))
48 #ifdef MISSING_VPRINTF
50 #undef MISSING_VPRINTF
51 #else /* !__GNU_LIBRARY */
54 #define vfprintf(file, format, ap) _doprnt (format, ap, file)
58 /* Can't #define it since printcmd.c needs it */
61 char *format; void *ap;
63 vfprintf (stdout, format, ap);
67 #endif /* GNU_LIBRARY */
68 #endif /* MISSING_VPRINTF */
73 /* Chain of cleanup actions established with make_cleanup,
74 to be executed if an error happens. */
76 static struct cleanup *cleanup_chain;
78 /* Nonzero means a quit has been requested. */
82 /* Nonzero means quit immediately if Control-C is typed now,
83 rather than waiting until QUIT is executed. */
87 /* Nonzero means that encoded C++ names should be printed out in their
88 C++ form rather than raw. */
92 /* Nonzero means that encoded C++ names should be printed out in their
93 C++ form even in assembler language displays. If this is set, but
94 DEMANGLE is zero, names are printed raw, i.e. DEMANGLE controls. */
98 /* Nonzero means that strings with character values >0x7F should be printed
99 as octal escapes. Zero means just print the value (e.g. it's an
100 international character, and the terminal or window can cope.) */
102 int sevenbit_strings = 0;
104 /* Add a new cleanup to the cleanup_chain,
105 and return the previous chain pointer
106 to be passed later to do_cleanups or discard_cleanups.
107 Args are FUNCTION to clean up with, and ARG to pass to it. */
110 make_cleanup (function, arg)
114 register struct cleanup *new
115 = (struct cleanup *) xmalloc (sizeof (struct cleanup));
116 register struct cleanup *old_chain = cleanup_chain;
118 new->next = cleanup_chain;
119 new->function = function;
126 /* Discard cleanups and do the actions they describe
127 until we get back to the point OLD_CHAIN in the cleanup_chain. */
130 do_cleanups (old_chain)
131 register struct cleanup *old_chain;
133 register struct cleanup *ptr;
134 while ((ptr = cleanup_chain) != old_chain)
136 (*ptr->function) (ptr->arg);
137 cleanup_chain = ptr->next;
142 /* Discard cleanups, not doing the actions they describe,
143 until we get back to the point OLD_CHAIN in the cleanup_chain. */
146 discard_cleanups (old_chain)
147 register struct cleanup *old_chain;
149 register struct cleanup *ptr;
150 while ((ptr = cleanup_chain) != old_chain)
152 cleanup_chain = ptr->next;
157 /* Set the cleanup_chain to 0, and return the old cleanup chain. */
161 struct cleanup *old_chain = cleanup_chain;
167 /* Restore the cleanup chain from a previously saved chain. */
169 restore_cleanups (chain)
170 struct cleanup *chain;
172 cleanup_chain = chain;
175 /* This function is useful for cleanups.
179 old_chain = make_cleanup (free_current_contents, &foo);
181 to arrange to free the object thus allocated. */
184 free_current_contents (location)
190 /* Print an error message and return to command level.
191 The first argument STRING is the error message, used as a fprintf string,
192 and the remaining args are passed as arguments to it. */
203 target_terminal_ours ();
205 string = va_arg (args, char *);
206 vfprintf (stderr, string, args);
207 fprintf (stderr, "\n");
209 return_to_top_level ();
212 /* Print an error message and exit reporting failure.
213 This is for a error that we cannot continue from.
214 The arguments are printed a la printf. */
225 string = va_arg (args, char *);
226 fprintf (stderr, "gdb: ");
227 vfprintf (stderr, string, args);
228 fprintf (stderr, "\n");
233 /* Print an error message and exit, dumping core.
234 The arguments are printed a la printf (). */
237 fatal_dump_core (va_alist)
244 string = va_arg (args, char *);
245 /* "internal error" is always correct, since GDB should never dump
246 core, no matter what the input. */
247 fprintf (stderr, "gdb internal error: ");
248 vfprintf (stderr, string, args);
249 fprintf (stderr, "\n");
252 signal (SIGQUIT, SIG_DFL);
253 kill (getpid (), SIGQUIT);
254 /* We should never get here, but just in case... */
258 /* Memory management stuff (malloc friends). */
260 #if defined (NO_MALLOC_CHECK)
264 #else /* Have mcheck(). */
268 fatal_dump_core ("Memory corruption");
274 mcheck (malloc_botch);
277 #endif /* Have mcheck(). */
279 /* Like malloc but get error if no storage available. */
291 /* At least one place (dbxread.c:condense_misc_bunches where misc_count == 0)
292 GDB wants to allocate zero bytes. */
296 val = (char *) malloc (size);
298 fatal ("virtual memory exhausted.", 0);
302 /* Like realloc but get error if no storage available. */
313 register char *val = (char *) realloc (ptr, size);
315 fatal ("virtual memory exhausted.", 0);
319 /* Print the system error message for errno, and also mention STRING
320 as the file name for which the error was encountered.
321 Then return to command level. */
324 perror_with_name (string)
328 extern char *sys_errlist[];
332 if (errno < sys_nerr)
333 err = sys_errlist[errno];
335 err = "unknown error";
337 combined = (char *) alloca (strlen (err) + strlen (string) + 3);
338 strcpy (combined, string);
339 strcat (combined, ": ");
340 strcat (combined, err);
342 /* I understand setting these is a matter of taste. Still, some people
343 may clear errno but not know about bfd_error. Doing this here is not
345 bfd_error = no_error;
348 error ("%s.", combined);
351 /* Print the system error message for ERRCODE, and also mention STRING
352 as the file name for which the error was encountered. */
355 print_sys_errmsg (string, errcode)
360 extern char *sys_errlist[];
364 if (errcode < sys_nerr)
365 err = sys_errlist[errcode];
367 err = "unknown error";
369 combined = (char *) alloca (strlen (err) + strlen (string) + 3);
370 strcpy (combined, string);
371 strcat (combined, ": ");
372 strcat (combined, err);
374 printf ("%s.\n", combined);
377 /* Control C eventually causes this to be called, at a convenient time. */
382 target_terminal_ours ();
384 ioctl (fileno (stdout), TCFLSH, 1);
385 #else /* not HAVE_TERMIO */
386 ioctl (fileno (stdout), TIOCFLUSH, 0);
387 #endif /* not HAVE_TERMIO */
391 error ("Quit (expect signal %d when inferior is resumed)", SIGINT);
392 #endif /* TIOCGPGRP */
395 /* Control C comes here */
403 /* Restore the signal handler. */
404 signal (SIGINT, request_quit);
411 /* My replacement for the read system call.
412 Used like `read' but keeps going if `read' returns too soon. */
415 myread (desc, addr, len)
425 val = read (desc, addr, len);
436 /* Make a copy of the string at PTR with SIZE characters
437 (and add a null character at the end in the copy).
438 Uses malloc to get the space. Returns the address of the copy. */
441 savestring (ptr, size)
445 register char *p = (char *) xmalloc (size + 1);
446 bcopy (ptr, p, size);
455 return savestring (ptr, strlen (ptr));
462 register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
463 register char *val = (char *) xmalloc (len);
471 print_spaces (n, file)
479 /* Ask user a y-or-n question and return 1 iff answer is yes.
480 Takes three args which are given to printf to print the question.
481 The first, a control string, should end in "? ".
482 It should not say how to answer, because we do that. */
494 /* Automatically answer "yes" if input is not from a terminal. */
495 if (!input_from_terminal_p ())
501 ctlstr = va_arg (args, char *);
502 vfprintf (stdout, ctlstr, args);
504 printf ("(y or n) ");
506 answer = fgetc (stdin);
507 clearerr (stdin); /* in case of C-d */
508 if (answer == EOF) /* C-d */
510 if (answer != '\n') /* Eat rest of input line, to EOF or newline */
513 ans2 = fgetc (stdin);
516 while (ans2 != EOF && ans2 != '\n');
523 printf ("Please answer y or n.\n");
527 /* Parse a C escape sequence. STRING_PTR points to a variable
528 containing a pointer to the string to parse. That pointer
529 should point to the character after the \. That pointer
530 is updated past the characters we use. The value of the
531 escape sequence is returned.
533 A negative value means the sequence \ newline was seen,
534 which is supposed to be equivalent to nothing at all.
536 If \ is followed by a null character, we return a negative
537 value and leave the string pointer pointing at the null character.
539 If \ is followed by 000, we return 0 and leave the string pointer
540 after the zeros. A value of 0 does not mean end of string. */
543 parse_escape (string_ptr)
546 register int c = *(*string_ptr)++;
571 c = *(*string_ptr)++;
573 c = parse_escape (string_ptr);
576 return (c & 0200) | (c & 037);
587 register int i = c - '0';
588 register int count = 0;
591 if ((c = *(*string_ptr)++) >= '0' && c <= '7')
609 /* Print the character CH on STREAM as part of the contents
610 of a literal string whose delimiter is QUOTER. */
613 printchar (ch, stream, quoter)
620 if (c < 040 || (sevenbit_strings && c >= 0177))
624 fputs_filtered ("\\n", stream);
627 fputs_filtered ("\\b", stream);
630 fputs_filtered ("\\t", stream);
633 fputs_filtered ("\\f", stream);
636 fputs_filtered ("\\r", stream);
639 fputs_filtered ("\\e", stream);
642 fputs_filtered ("\\a", stream);
645 fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
650 if (c == '\\' || c == quoter)
651 fputs_filtered ("\\", stream);
652 fprintf_filtered (stream, "%c", c);
656 /* Number of lines per page or UINT_MAX if paging is disabled. */
657 static unsigned int lines_per_page;
658 /* Number of chars per line or UNIT_MAX is line folding is disabled. */
659 static unsigned int chars_per_line;
660 /* Current count of lines printed on this page, chars on this line. */
661 static unsigned int lines_printed, chars_printed;
663 /* Buffer and start column of buffered text, for doing smarter word-
664 wrapping. When someone calls wrap_here(), we start buffering output
665 that comes through fputs_filtered(). If we see a newline, we just
666 spit it out and forget about the wrap_here(). If we see another
667 wrap_here(), we spit it out and remember the newer one. If we see
668 the end of the line, we spit out a newline, the indent, and then
671 wrap_column is the column number on the screen where wrap_buffer begins.
672 When wrap_column is zero, wrapping is not in effect.
673 wrap_buffer is malloc'd with chars_per_line+2 bytes.
674 When wrap_buffer[0] is null, the buffer is empty.
675 wrap_pointer points into it at the next character to fill.
676 wrap_indent is the string that should be used as indentation if the
679 static char *wrap_buffer, *wrap_pointer, *wrap_indent;
680 static int wrap_column;
682 /* Get the number of lines to print with commands like "list".
683 This is based on guessing how many long (i.e. more than chars_per_line
684 characters) lines there will be. To be completely correct, "list"
685 and friends should be rewritten to count characters and see where
686 things are wrapping, but that would be a fair amount of work. */
690 /* RMS didn't like the following algorithm. Let's set it back to
691 10 and see if anyone else complains. */
692 /* return lines_per_page == UINT_MAX ? 10 : lines_per_page / 2; */
697 set_width_command (args, from_tty, c)
700 struct cmd_list_element *c;
704 wrap_buffer = (char *) xmalloc (chars_per_line + 2);
705 wrap_buffer[0] = '\0';
708 wrap_buffer = (char *) xrealloc (wrap_buffer, chars_per_line + 2);
709 wrap_pointer = wrap_buffer; /* Start it at the beginning */
713 prompt_for_continue ()
716 gdb_readline ("---Type <return> to continue---", 0);
717 chars_printed = lines_printed = 0;
721 /* Reinitialize filter; ie. tell it to reset to original values. */
724 reinitialize_more_filter ()
730 /* Indicate that if the next sequence of characters overflows the line,
731 a newline should be inserted here rather than when it hits the end.
732 If INDENT is nonzero, it is a string to be printed to indent the
733 wrapped part on the next line. INDENT must remain accessible until
734 the next call to wrap_here() or until a newline is printed through
737 If the line is already overfull, we immediately print a newline and
738 the indentation, and disable further wrapping.
740 INDENT should not contain tabs, as that
741 will mess up the char count on the next line. FIXME. */
749 *wrap_pointer = '\0';
750 fputs (wrap_buffer, stdout);
752 wrap_pointer = wrap_buffer;
753 wrap_buffer[0] = '\0';
754 if (chars_printed >= chars_per_line)
756 puts_filtered ("\n");
757 puts_filtered (indent);
762 wrap_column = chars_printed;
763 wrap_indent = indent;
767 /* Like fputs but pause after every screenful, and can wrap at points
768 other than the final character of a line.
769 Unlike fputs, fputs_filtered does not return a value.
770 It is OK for LINEBUFFER to be NULL, in which case just don't print
773 Note that a longjmp to top level may occur in this routine
774 (since prompt_for_continue may do so) so this routine should not be
775 called when cleanups are not in place. */
778 fputs_filtered (linebuffer, stream)
787 /* Don't do any filtering if it is disabled. */
789 || (lines_per_page == UINT_MAX && chars_per_line == UINT_MAX))
791 fputs (linebuffer, stream);
795 /* Go through and output each character. Show line extension
796 when this is necessary; prompt user for new page when this is
799 lineptr = linebuffer;
802 /* Possible new page. */
803 if (lines_printed >= lines_per_page - 1)
804 prompt_for_continue ();
806 while (*lineptr && *lineptr != '\n')
808 /* Print a single line. */
809 if (*lineptr == '\t')
812 *wrap_pointer++ = '\t';
815 /* Shifting right by 3 produces the number of tab stops
816 we have already passed, and then adding one and
817 shifting left 3 advances to the next tab stop. */
818 chars_printed = ((chars_printed >> 3) + 1) << 3;
824 *wrap_pointer++ = *lineptr;
826 putc (*lineptr, stream);
831 if (chars_printed >= chars_per_line)
833 unsigned int save_chars = chars_printed;
837 /* If we aren't actually wrapping, don't output newline --
838 if chars_per_line is right, we probably just overflowed
839 anyway; if it's wrong, let us keep going. */
843 /* Possible new page. */
844 if (lines_printed >= lines_per_page - 1)
845 prompt_for_continue ();
847 /* Now output indentation and wrapped string */
851 fputs (wrap_indent, stream);
852 *wrap_pointer = '\0'; /* Null-terminate saved stuff */
853 fputs (wrap_buffer, stream); /* and eject it */
854 /* FIXME, this strlen is what prevents wrap_indent from
855 containing tabs. However, if we recurse to print it
856 and count its chars, we risk trouble if wrap_indent is
857 longer than (the user settable) chars_per_line.
858 Note also that this can set chars_printed > chars_per_line
859 if we are printing a long string. */
860 chars_printed = strlen (wrap_indent)
861 + (save_chars - wrap_column);
862 wrap_pointer = wrap_buffer; /* Reset buffer */
863 wrap_buffer[0] = '\0';
864 wrap_column = 0; /* And disable fancy wrap */
869 if (*lineptr == '\n')
872 wrap_here (""); /* Spit out chars, cancel further wraps */
881 /* fputs_demangled is a variant of fputs_filtered that
882 demangles g++ names.*/
885 fputs_demangled (linebuffer, stream, arg_mode)
891 extern char *cplus_demangle (const char *, int);
893 extern char *cplus_demangle ();
895 #define SYMBOL_MAX 1024
897 #define SYMBOL_CHAR(c) (isascii(c) \
898 && (isalnum(c) || (c) == '_' || (c) == CPLUS_MARKER))
900 char buf[SYMBOL_MAX+1];
901 # define SLOP 5 /* How much room to leave in buf */
904 if (linebuffer == NULL)
907 /* If user wants to see raw output, no problem. */
909 fputs_filtered (linebuffer, stream);
914 while ( *p != (char) 0 ) {
917 /* collect non-interesting characters into buf */
918 while ( *p != (char) 0 && !SYMBOL_CHAR(*p) && i < (int)sizeof(buf)-SLOP ) {
923 /* output the non-interesting characters without demangling */
925 fputs_filtered(buf, stream);
926 i = 0; /* reset buf */
929 /* and now the interesting characters */
930 while (i < SYMBOL_MAX
933 && i < (int)sizeof(buf) - SLOP) {
941 if ( (result = cplus_demangle(buf, arg_mode)) != NULL ) {
942 fputs_filtered(result, stream);
946 fputs_filtered(buf, stream);
952 /* Print a variable number of ARGS using format FORMAT. If this
953 information is going to put the amount written (since the last call
954 to INITIALIZE_MORE_FILTER or the last page break) over the page size,
955 print out a pause message and do a gdb_readline to get the users
956 permision to continue.
958 Unlike fprintf, this function does not return a value.
960 We implement three variants, vfprintf (takes a vararg list and stream),
961 fprintf (takes a stream to write on), and printf (the usual).
963 Note that this routine has a restriction that the length of the
964 final output line must be less than 255 characters *or* it must be
965 less than twice the size of the format string. This is a very
966 arbitrary restriction, but it is an internal restriction, so I'll
967 put it in. This means that the %s format specifier is almost
968 useless; unless the caller can GUARANTEE that the string is short
969 enough, fputs_filtered should be used instead.
971 Note also that a longjmp to top level may occur in this routine
972 (since prompt_for_continue may do so) so this routine should not be
973 called when cleanups are not in place. */
975 #if !defined(MISSING_VPRINTF) || defined (vsprintf)
978 vfprintf_filtered (stream, format, args)
981 void fprintf_filtered (stream, format, arg1, arg2, arg3, arg4, arg5, arg6)
986 static char *linebuffer = (char *) 0;
987 static int line_size;
990 format_length = strlen (format);
992 /* Allocated linebuffer for the first time. */
995 linebuffer = (char *) xmalloc (255);
999 /* Reallocate buffer to a larger size if this is necessary. */
1000 if (format_length * 2 > line_size)
1002 line_size = format_length * 2;
1004 /* You don't have to copy. */
1006 linebuffer = (char *) xmalloc (line_size);
1010 /* This won't blow up if the restrictions described above are
1012 #if !defined(MISSING_VPRINTF) || defined (vsprintf)
1013 (void) vsprintf (linebuffer, format, args);
1015 (void) sprintf (linebuffer, format, arg1, arg2, arg3, arg4, arg5, arg6);
1018 fputs_filtered (linebuffer, stream);
1021 #if !defined(MISSING_VPRINTF) || defined (vsprintf)
1024 fprintf_filtered (va_alist)
1032 stream = va_arg (args, FILE *);
1033 format = va_arg (args, char *);
1035 /* This won't blow up if the restrictions described above are
1037 (void) vfprintf_filtered (stream, format, args);
1043 printf_filtered (va_alist)
1050 format = va_arg (args, char *);
1052 (void) vfprintf_filtered (stdout, format, args);
1057 printf_filtered (format, arg1, arg2, arg3, arg4, arg5, arg6)
1059 int arg1, arg2, arg3, arg4, arg5, arg6;
1061 fprintf_filtered (stdout, format, arg1, arg2, arg3, arg4, arg5, arg6);
1068 puts_filtered (string)
1071 fputs_filtered (string, stdout);
1074 /* Return a pointer to N spaces and a null. The pointer is good
1075 until the next call to here. */
1081 static char *spaces;
1082 static int max_spaces;
1088 spaces = malloc (n+1);
1089 for (t = spaces+n; t != spaces;)
1095 return spaces + max_spaces - n;
1098 /* Print N spaces. */
1100 print_spaces_filtered (n, stream)
1104 fputs_filtered (n_spaces (n), stream);
1107 /* C++ demangler stuff. */
1108 char *cplus_demangle ();
1110 /* Print NAME on STREAM, demangling if necessary. */
1112 fprint_symbol (stream, name)
1117 if ((!demangle) || NULL == (demangled = cplus_demangle (name, 1)))
1118 fputs_filtered (name, stream);
1121 fputs_filtered (demangled, stream);
1126 #if !defined (USG_UTILS)
1127 #define USG_UTILS defined (USG)
1131 bcopy (from, to, count)
1134 memcpy (to, from, count);
1137 bcmp (from, to, count)
1139 return (memcmp (to, from, count));
1152 getcwd (buf, MAXPATHLEN);
1160 return strchr (s, c);
1168 return strrchr (s, c);
1170 #endif /* USG_UTILS. */
1172 #if !defined (QUEUE_MISSING)
1173 #define QUEUE_MISSING defined (USG)
1177 /* Queue routines */
1184 insque (item, after)
1186 struct queue *after;
1188 item->forw = after->forw;
1189 after->forw->back = item;
1198 item->forw->back = item->back;
1199 item->back->forw = item->forw;
1201 #endif /* QUEUE_MISSING */
1203 /* Simple implementation of strstr, since some implementations lack it. */
1206 const char *in, *find;
1208 register char *p = in - 1;
1210 while (0 != (p = strchr (p+1, *find))) {
1211 if (strcmp (p, find))
1218 _initialize_utils ()
1220 struct cmd_list_element *c;
1222 c = add_set_cmd ("width", class_support, var_uinteger,
1223 (char *)&chars_per_line,
1224 "Set number of characters gdb thinks are in a line.",
1226 add_show_from_set (c, &showlist);
1227 c->function = set_width_command;
1230 (add_set_cmd ("height", class_support,
1231 var_uinteger, (char *)&lines_per_page,
1232 "Set number of lines gdb thinks are in a page.", &setlist),
1235 /* These defaults will be used if we are unable to get the correct
1236 values from termcap. */
1237 lines_per_page = 24;
1238 chars_per_line = 80;
1239 /* Initialize the screen height and width from termcap. */
1241 char *termtype = getenv ("TERM");
1243 /* Positive means success, nonpositive means failure. */
1246 /* 2048 is large enough for all known terminals, according to the
1247 GNU termcap manual. */
1248 char term_buffer[2048];
1252 status = tgetent (term_buffer, termtype);
1257 val = tgetnum ("li");
1259 lines_per_page = val;
1261 /* The number of lines per page is not mentioned
1262 in the terminal description. This probably means
1263 that paging is not useful (e.g. emacs shell window),
1264 so disable paging. */
1265 lines_per_page = UINT_MAX;
1267 val = tgetnum ("co");
1269 chars_per_line = val;
1274 set_width_command ((char *)NULL, 0, c);
1277 (add_set_cmd ("demangle", class_support, var_boolean,
1279 "Set demangling of encoded C++ names when displaying symbols.",
1284 (add_set_cmd ("sevenbit-strings", class_support, var_boolean,
1285 (char *)&sevenbit_strings,
1286 "Set printing of 8-bit characters in strings as \\nnn.",
1291 (add_set_cmd ("asm-demangle", class_support, var_boolean,
1292 (char *)&asm_demangle,
1293 "Set demangling of C++ names in disassembly listings.",