assert/assert.h

   1 /* Copyright (C) 1991, 1992 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
  16 not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      ANSI Standard: 4.2 DIAGNOSTICS  <assert.h>
  21  */
  22
  23 #ifdef  _ASSERT_H
  24
  25 #undef  _ASSERT_H
  26 #undef  assert
  27
  28 #endif /* assert.h      */
  29
  30 #define _ASSERT_H       1
  31 #include <features.h>
  32
  33 __BEGIN_DECLS
  34
  35 /* void assert(int expression);
  36    If NDEBUG is defined, do nothing.
  37    If not, and EXPRESSION is zero, print an error message and abort.  */
  38
  39 #ifdef  NDEBUG
  40
  41 #define assert(expr)    ((void) 0)
  42
  43 #else /* Not NDEBUG.  */
  44
  45 /* This prints an "Assertion failed" message and aborts.  */
  46 extern int __assert_fail __P ((__const char *__assertion,
  47                                __const char *__file, unsigned int __line));
  48
  49 #include <sys/cdefs.h>
  50
  51 #define assert(expr)                                                          \
  52   ((void) ((expr) ||                                                          \
  53            __assert_fail (__STRING(expr), __FILE__, __LINE__)))
  54
  55 #endif /* NDEBUG.  */
  56
  57 __END_DECLS