assert/assert.h

   1 /* Copyright (C) 1991, 1992, 1994, 1995 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 /* void assert (int expression);
  34
  35    If NDEBUG is defined, do nothing.
  36    If not, and EXPRESSION is zero, print an error message and abort.  */
  37
  38 #ifdef  NDEBUG
  39
  40 #define assert(expr)            ((void) 0)
  41
  42 /* void assert_perror (int errnum);
  43
  44    If NDEBUG is defined, do nothing.  If not, and ERRNUM is not zero, print an
  45    error message with the error text for ERRNUM and abort.
  46    (This is a GNU extension.) */
  47
  48 #ifdef  __USE_GNU
  49 #define assert_perror(errnum)   ((void) 0)
  50 #endif
  51
  52 #else /* Not NDEBUG.  */
  53
  54 #include <sys/cdefs.h>
  55
  56 __BEGIN_DECLS
  57
  58 /* This prints an "Assertion failed" message and aborts.  */
  59 extern void __assert_fail __P ((__const char *__assertion,
  60                                 __const char *__file,
  61                                 unsigned int __line,
  62                                 __const char *__function))
  63      __attribute__ ((__noreturn__));
  64
  65 /* Likewise, but prints the error text for ERRNUM.  */
  66 extern void __assert_perror_fail __P ((int __errnum,
  67                                        __const char *__file,
  68                                        unsigned int __line,
  69                                        __const char *__function))
  70      __attribute__ ((__noreturn__));
  71
  72 __END_DECLS
  73
  74 #define assert(expr)                                                          \
  75   ((void) ((expr) ||                                                          \
  76            (__assert_fail (__STRING(expr),                                    \
  77                            __FILE__, __LINE__, __ASSERT_FUNCTION), 0)))
  78
  79 #ifdef  __USE_GNU
  80 #define assert_perror(errnum)                                                 \
  81   ((void) ((errnum) && (__assert_perror_fail ((errnum),                       \
  82                                               __FILE__, __LINE__,             \
  83                                               __ASSERT_FUNCTION), 0)))
  84 #endif
  85
  86 /* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
  87    which contains the name of the function currently being defined.
  88    This is broken in G++ before version 2.6.  */
  89 #if (!defined (__GNUC__) || __GNUC__ < 2 || \
  90      __GNUC_MINOR__ < (defined (__cplusplus) ? 6 : 4))
  91 #define __ASSERT_FUNCTION       ((__const char *) 0)
  92 #else
  93 #define __ASSERT_FUNCTION       __PRETTY_FUNCTION__
  94 #endif
  95
  96
  97 #endif /* NDEBUG.  */
  98