assert/assert.h

   1 /* Copyright (C) 1991,92,94,95,96,97,98,99,2000 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 /*
  20  *      ISO C99 Standard: 7.2 Diagnostics       <assert.h>
  21  */
  22
  23 #ifdef  _ASSERT_H
  24
  25 # undef _ASSERT_H
  26 # undef assert
  27
  28 # ifdef __USE_GNU
  29 #  undef assert_perror
  30 # endif
  31
  32 #endif /* assert.h      */
  33
  34 #define _ASSERT_H       1
  35 #include <features.h>
  36
  37 /* void assert (int expression);
  38
  39    If NDEBUG is defined, do nothing.
  40    If not, and EXPRESSION is zero, print an error message and abort.  */
  41
  42 #ifdef  NDEBUG
  43
  44 # define assert(expr)           ((void) 0)
  45
  46 /* void assert_perror (int errnum);
  47
  48    If NDEBUG is defined, do nothing.  If not, and ERRNUM is not zero, print an
  49    error message with the error text for ERRNUM and abort.
  50    (This is a GNU extension.) */
  51
  52 # ifdef __USE_GNU
  53 #  define assert_perror(errnum) ((void) 0)
  54 # endif
  55
  56 #else /* Not NDEBUG.  */
  57
  58 __BEGIN_DECLS
  59
  60 /* This prints an "Assertion failed" message and aborts.  */
  61 extern void __assert_fail (__const char *__assertion, __const char *__file,
  62                            unsigned int __line, __const char *__function)
  63      __THROW __attribute__ ((__noreturn__));
  64
  65 /* Likewise, but prints the error text for ERRNUM.  */
  66 extern void __assert_perror_fail (int __errnum, __const char *__file,
  67                                   unsigned int __line,
  68                                   __const char *__function)
  69      __THROW __attribute__ ((__noreturn__));
  70
  71
  72 /* The following is not at all used here but needed for standard
  73    compliance.  */
  74 extern void __assert (const char *__assertion, const char *__file, int __line)
  75      __THROW __attribute__ ((__noreturn__));
  76
  77
  78 __END_DECLS
  79
  80 # define assert(expr)                                                         \
  81   ((void) ((expr) ? 0 :                                                       \
  82            (__assert_fail (__STRING(expr),                                    \
  83                            __FILE__, __LINE__, __ASSERT_FUNCTION), 0)))
  84
  85 # ifdef __USE_GNU
  86 #  define assert_perror(errnum)                                               \
  87   ((void) (!(errnum) ? 0 : (__assert_perror_fail ((errnum),                   \
  88                                                   __FILE__, __LINE__,         \
  89                                                   __ASSERT_FUNCTION), 0)))
  90 # endif
  91
  92 /* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
  93    which contains the name of the function currently being defined.
  94    This is broken in G++ before version 2.6.
  95    C9x has a similar variable called __func__, but prefer the GCC one since
  96    it demangles C++ function names.  */
  97 # if defined __cplusplus ? __GNUC_PREREQ (2, 6) : __GNUC_PREREQ (2, 4)
  98 #   define __ASSERT_FUNCTION    __PRETTY_FUNCTION__
  99 # else
 100 #  if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
 101 #   define __ASSERT_FUNCTION    __func__
 102 #  else
 103 #   define __ASSERT_FUNCTION    ((__const char *) 0)
 104 #  endif
 105 # endif
 106
 107 #endif /* NDEBUG.  */