assert/assert.c

   1 /* Copyright (C) 1991,1994-1996,1998,2001,2002 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 <libintl.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sysdep.h>
  24 #include <unistd.h>
  25
  26
  27 extern const char *__progname;
  28
  29 #ifdef USE_IN_LIBIO
  30 # include <wchar.h>
  31 # include <libio/iolibio.h>
  32 # define fflush(s) INTUSE(_IO_fflush) (s)
  33 #endif
  34
  35 /* This function, when passed a string containing an asserted
  36    expression, a filename, and a line number, prints a message
  37    on the standard error stream of the form:
  38         a.c:10: foobar: Assertion `a == b' failed.
  39    It then aborts program execution via a call to `abort'.  */
  40
  41 #ifdef FATAL_PREPARE_INCLUDE
  42 # include FATAL_PREPARE_INCLUDE
  43 #endif
  44
  45 #undef __assert_fail
  46 void
  47 __assert_fail (const char *assertion, const char *file, unsigned int line,
  48                const char *function)
  49 {
  50   char *buf;
  51
  52 #ifdef FATAL_PREPARE
  53   FATAL_PREPARE;
  54 #endif
  55
  56   if (__asprintf (&buf, _("%s%s%s:%u: %s%sAssertion `%s' failed.\n"),
  57                   __progname, __progname[0] ? ": " : "",
  58                   file, line,
  59                   function ? function : "", function ? ": " : "",
  60                   assertion) >= 0)
  61     {
  62       /* Print the message.  */
  63 #ifdef USE_IN_LIBIO
  64       if (_IO_fwide (stderr, 0) > 0)
  65         (void) __fwprintf (stderr, L"%s", buf);
  66       else
  67 #endif
  68         (void) fputs (buf, stderr);
  69
  70       (void) fflush (stderr);
  71
  72       /* We have to free the buffer since the application might catch the
  73          SIGABRT.  */
  74       free (buf);
  75     }
  76   else
  77     {
  78       /* At least print a minimal message.  */
  79       static const char errstr[] = "Unexpected error.\n";
  80       __libc_write (STDERR_FILENO, errstr, sizeof (errstr) - 1);
  81     }
  82
  83   abort ();
  84 }
  85 hidden_def(__assert_fail)