include/limits.h

   1 /* Copyright (C) 1991, 1992, 1996, 1997, 1998, 1999, 2000, 2005
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h>
  22  */
  23
  24 #ifndef _LIBC_LIMITS_H_
  25 #define _LIBC_LIMITS_H_ 1
  26
  27 #include <features.h>
  28
  29
  30 /* Maximum length of any multibyte character in any locale.
  31    We define this value here since the gcc header does not define
  32    the correct value.  */
  33 #define MB_LEN_MAX      16
  34
  35
  36 /* If we are not using GNU CC we have to define all the symbols ourself.
  37    Otherwise use gcc's definitions (see below).  */
  38 #if !defined __GNUC__ || __GNUC__ < 2
  39
  40 /* We only protect from multiple inclusion here, because all the other
  41    #include's protect themselves, and in GCC 2 we may #include_next through
  42    multiple copies of this file before we get to GCC's.  */
  43 # ifndef _LIMITS_H
  44 #  define _LIMITS_H     1
  45
  46 #include <bits/wordsize.h>
  47
  48 /* We don't have #include_next.
  49    Define ANSI <limits.h> for standard 32-bit words.  */
  50
  51 /* These assume 8-bit `char's, 16-bit `short int's,
  52    and 32-bit `int's and `long int's.  */
  53
  54 /* Number of bits in a `char'.  */
  55 #  define CHAR_BIT      8
  56
  57 /* Minimum and maximum values a `signed char' can hold.  */
  58 #  define SCHAR_MIN     (-128)
  59 #  define SCHAR_MAX     127
  60
  61 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  62 #  define UCHAR_MAX     255
  63
  64 /* Minimum and maximum values a `char' can hold.  */
  65 #  ifdef __CHAR_UNSIGNED__
  66 #   define CHAR_MIN     0
  67 #   define CHAR_MAX     UCHAR_MAX
  68 #  else
  69 #   define CHAR_MIN     SCHAR_MIN
  70 #   define CHAR_MAX     SCHAR_MAX
  71 #  endif
  72
  73 /* Minimum and maximum values a `signed short int' can hold.  */
  74 #  define SHRT_MIN      (-32768)
  75 #  define SHRT_MAX      32767
  76
  77 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0.)  */
  78 #  define USHRT_MAX     65535
  79
  80 /* Minimum and maximum values a `signed int' can hold.  */
  81 #  define INT_MIN       (-INT_MAX - 1)
  82 #  define INT_MAX       2147483647
  83
  84 /* Maximum value an `unsigned int' can hold.  (Minimum is 0.)  */
  85 #  define UINT_MAX      4294967295U
  86
  87 /* Minimum and maximum values a `signed long int' can hold.  */
  88 #  if __WORDSIZE == 64
  89 #   define LONG_MAX     9223372036854775807L
  90 #  else
  91 #   define LONG_MAX     2147483647L
  92 #  endif
  93 #  define LONG_MIN      (-LONG_MAX - 1L)
  94
  95 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
  96 #  if __WORDSIZE == 64
  97 #   define ULONG_MAX    18446744073709551615UL
  98 #  else
  99 #   define ULONG_MAX    4294967295UL
 100 #  endif
 101
 102 #  ifdef __USE_ISOC99
 103
 104 /* Minimum and maximum values a `signed long long int' can hold.  */
 105 #   define LLONG_MAX    9223372036854775807LL
 106 #   define LLONG_MIN    (-LLONG_MAX - 1LL)
 107
 108 /* Maximum value an `unsigned long long int' can hold.  (Minimum is 0.)  */
 109 #   define ULLONG_MAX   18446744073709551615ULL
 110
 111 #  endif /* ISO C99 */
 112
 113 # endif /* limits.h  */
 114 #endif  /* GCC 2.  */
 115
 116 #endif  /* !_LIBC_LIMITS_H_ */
 117
 118  /* Get the compiler's limits.h, which defines almost all the ISO constants.
 119
 120     We put this #include_next outside the double inclusion check because
 121     it should be possible to include this file more than once and still get
 122     the definitions from gcc's header.  */
 123 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
 124 /* `_GCC_LIMITS_H_' is what GCC's file defines.  */
 125 # include_next <limits.h>
 126 #endif
 127
 128 /* The <limits.h> files in some gcc versions don't define LLONG_MIN,
 129    LLONG_MAX, and ULLONG_MAX.  Instead only the values gcc defined for
 130    ages are available.  */
 131 #if defined __USE_ISOC99 && defined __GNUC__
 132 # ifndef LLONG_MIN
 133 #  define LLONG_MIN     (-LLONG_MAX-1)
 134 # endif
 135 # ifndef LLONG_MAX
 136 #  define LLONG_MAX     __LONG_LONG_MAX__
 137 # endif
 138 # ifndef ULLONG_MAX
 139 #  define ULLONG_MAX    (LLONG_MAX * 2ULL + 1)
 140 # endif
 141 #endif
 142
 143 #ifdef  __USE_POSIX
 144 /* POSIX adds things to <limits.h>.  */
 145 # include <bits/posix1_lim.h>
 146 #endif
 147
 148 #ifdef  __USE_POSIX2
 149 # include <bits/posix2_lim.h>
 150 #endif
 151
 152 #ifdef  __USE_XOPEN
 153 # include <bits/xopen_lim.h>
 154 #endif