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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sysdep.h>
  23
  24
  25 const char *__assert_program_name;
  26
  27 #ifdef USE_IN_LIBIO
  28 # include <libio/iolibio.h>
  29 # define fflush(s) _IO_fflush (s)
  30 #endif
  31
  32 /* This function, when passed a string containing an asserted
  33    expression, a filename, and a line number, prints a message
  34    on the standard error stream of the form:
  35         a.c:10: foobar: Assertion `a == b' failed.
  36    It then aborts program execution via a call to `abort'.  */
  37
  38 #ifdef FATAL_PREPARE_INCLUDE
  39 # include FATAL_PREPARE_INCLUDE
  40 #endif
  41
  42 void
  43 __assert_fail (const char *assertion, const char *file, unsigned int line,
  44                const char *function)
  45 {
  46 #ifdef FATAL_PREPARE
  47   FATAL_PREPARE;
  48 #endif
  49
  50   /* Print the message.  */
  51   (void) fprintf (stderr, _("%s%s%s:%u: %s%sAssertion `%s' failed.\n"),
  52                   __assert_program_name ? __assert_program_name : "",
  53                   __assert_program_name ? ": " : "",
  54                   file, line,
  55                   function ? function : "", function ? ": " : "",
  56                   assertion);
  57   (void) fflush (stderr);
  58
  59   abort ();
  60 }
  61
  62 #ifdef  HAVE_GNU_LD
  63
  64 #include <string.h>
  65
  66 static void
  67 set_progname (int argc, char **argv, char **envp)
  68 {
  69   char *p;
  70
  71   if (argv && argv[0])
  72     {
  73       p = strrchr (argv[0], '/');
  74       if (p == NULL)
  75         __assert_program_name = argv[0];
  76       else
  77         __assert_program_name = p + 1;
  78     }
  79
  80   (void) &set_progname;         /* Avoid "defined but not used" warning.  */
  81 }
  82
  83 text_set_element (__libc_subinit, set_progname);
  84
  85 #endif