assert/assert.c

   1 /* Copyright (C) 1991, 1994, 1995, 1996, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sysdep.h>
  23 #include <libintl.h>
  24
  25
  26 const char *__assert_program_name;
  27
  28 #ifdef USE_IN_LIBIO
  29 # include <libio/iolibio.h>
  30 # define fflush(s) _IO_fflush (s)
  31 #endif
  32
  33 /* This function, when passed a string containing an asserted
  34    expression, a filename, and a line number, prints a message
  35    on the standard error stream of the form:
  36         a.c:10: foobar: Assertion `a == b' failed.
  37    It then aborts program execution via a call to `abort'.  */
  38
  39 #ifdef FATAL_PREPARE_INCLUDE
  40 # include FATAL_PREPARE_INCLUDE
  41 #endif
  42
  43 void
  44 __assert_fail (const char *assertion, const char *file, unsigned int line,
  45                const char *function)
  46 {
  47 #ifdef FATAL_PREPARE
  48   FATAL_PREPARE;
  49 #endif
  50
  51   /* Print the message.  */
  52   (void) fprintf (stderr, _("%s%s%s:%u: %s%sAssertion `%s' failed.\n"),
  53                   __assert_program_name ? __assert_program_name : "",
  54                   __assert_program_name ? ": " : "",
  55                   file, line,
  56                   function ? function : "", function ? ": " : "",
  57                   assertion);
  58   (void) fflush (stderr);
  59
  60   abort ();
  61 }
  62
  63 #ifdef  HAVE_GNU_LD
  64
  65 #include <string.h>
  66
  67 static void
  68 set_progname (int argc, char **argv, char **envp)
  69 {
  70   char *p;
  71
  72   if (argv && argv[0])
  73     {
  74       p = strrchr (argv[0], '/');
  75       if (p == NULL)
  76         __assert_program_name = argv[0];
  77       else
  78         __assert_program_name = p + 1;
  79     }
  80
  81   (void) &set_progname;         /* Avoid "defined but not used" warning.  */
  82 }
  83
  84 text_set_element (__libc_subinit, set_progname);
  85
  86 #endif