debug/backtracesyms.c

   1 /* Return list with names for address in backtrace.
   2    Copyright (C) 1998, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library 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 GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <execinfo.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25
  26 /* Assume the worst for the width of an address.  */
  27 #define WORD_WIDTH 16
  28
  29
  30 char **
  31 __backtrace_symbols (array, size)
  32      void *const *array;
  33      int size;
  34 {
  35   int cnt;
  36   size_t total = 0;
  37   char **result;
  38
  39   /* We can compute the text size needed for the symbols since we print
  40      them all as "[+0x<addr>]".  */
  41   total = size * (WORD_WIDTH + 6);
  42
  43   /* Allocate memory for the result.  */
  44   result = malloc (size * sizeof (char *) + total);
  45   if (result != NULL)
  46     {
  47       char *last = (char *) (result + size);
  48
  49       for (cnt = 0; cnt < size; ++cnt)
  50         {
  51           result[cnt] = last;
  52           last += 1 + sprintf (last, "[+%p]", array[cnt]);
  53         }
  54     }
  55
  56   return result;
  57 }
  58 weak_alias (__backtrace_symbols, backtrace_symbols)