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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /*
  20  *      ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h>
  21  */
  22
  23 #ifndef _LIBC_LIMITS_H_
  24 #define _LIBC_LIMITS_H_ 1
  25
  26 #include <features.h>
  27
  28
  29 /* Maximum length of any multibyte character in any locale.
  30    We define this value here since the gcc header does not define
  31    the correct value.  */
  32 #define MB_LEN_MAX      16
  33
  34
  35 /* If we are not using GNU CC we have to define all the symbols ourself.
  36    Otherwise use gcc's definitions (see below).  */
  37 #if !defined __GNUC__ || __GNUC__ < 2
  38
  39 /* We only protect from multiple inclusion here, because all the other
  40    #include's protect themselves, and in GCC 2 we may #include_next through
  41    multiple copies of this file before we get to GCC's.  */
  42 # ifndef _LIMITS_H
  43 #  define _LIMITS_H     1
  44
  45 #include <bits/wordsize.h>
  46
  47 /* We don't have #include_next.
  48    Define ANSI <limits.h> for standard 32-bit words.  */
  49
  50 /* These assume 8-bit `char's, 16-bit `short int's,
  51    and 32-bit `int's and `long int's.  */
  52
  53 /* Number of bits in a `char'.  */
  54 #  define CHAR_BIT      8
  55
  56 /* Minimum and maximum values a `signed char' can hold.  */
  57 #  define SCHAR_MIN     (-128)
  58 #  define SCHAR_MAX     127
  59
  60 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  61 #  define UCHAR_MAX     255
  62
  63 /* Minimum and maximum values a `char' can hold.  */
  64 #  ifdef __CHAR_UNSIGNED__
  65 #   define CHAR_MIN     0
  66 #   define CHAR_MAX     UCHAR_MAX
  67 #  else
  68 #   define CHAR_MIN     SCHAR_MIN
  69 #   define CHAR_MAX     SCHAR_MAX
  70 #  endif
  71
  72 /* Minimum and maximum values a `signed short int' can hold.  */
  73 #  define SHRT_MIN      (-32768)
  74 #  define SHRT_MAX      32767
  75
  76 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0.)  */
  77 #  define USHRT_MAX     65535
  78
  79 /* Minimum and maximum values a `signed int' can hold.  */
  80 #  define INT_MIN       (-INT_MAX - 1)
  81 #  define INT_MAX       2147483647
  82
  83 /* Maximum value an `unsigned int' can hold.  (Minimum is 0.)  */
  84 #  define UINT_MAX      4294967295U
  85
  86 /* Minimum and maximum values a `signed long int' can hold.  */
  87 #  if __WORDSIZE == 64
  88 #   define LONG_MAX     9223372036854775807L
  89 #  else
  90 #   define LONG_MAX     2147483647L
  91 #  endif
  92 #  define LONG_MIN      (-LONG_MAX - 1L)
  93
  94 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
  95 #  if __WORDSIZE == 64
  96 #   define ULONG_MAX    18446744073709551615UL
  97 #  else
  98 #   define ULONG_MAX    4294967295UL
  99 #  endif
 100
 101 #  ifdef __USE_ISOC99
 102
 103 /* Minimum and maximum values a `signed long long int' can hold.  */
 104 #   define LLONG_MAX    9223372036854775807LL
 105 #   define LLONG_MIN    (-LLONG_MAX - 1LL)
 106
 107 /* Maximum value an `unsigned long long int' can hold.  (Minimum is 0.)  */
 108 #   define ULLONG_MAX   18446744073709551615ULL
 109
 110 #  endif /* ISO C99 */
 111
 112 # endif /* limits.h  */
 113 #endif  /* GCC 2.  */
 114
 115 #endif  /* !_LIBC_LIMITS_H_ */
 116
 117  /* Get the compiler's limits.h, which defines almost all the ISO constants.
 118
 119     We put this #include_next outside the double inclusion check because
 120     it should be possible to include this file more than once and still get
 121     the definitions from gcc's header.  */
 122 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
 123 /* `_GCC_LIMITS_H_' is what GCC's file defines.  */
 124 # include_next <limits.h>
 125 #endif
 126
 127 /* The <limits.h> files in some gcc versions don't define LLONG_MIN,
 128    LLONG_MAX, and ULLONG_MAX.  Instead only the values gcc defined for
 129    ages are available.  */
 130 #if defined __USE_ISOC99 && defined __GNUC__
 131 # ifndef LLONG_MIN
 132 #  define LLONG_MIN     (-LLONG_MAX-1)
 133 # endif
 134 # ifndef LLONG_MAX
 135 #  define LLONG_MAX     __LONG_LONG_MAX__
 136 # endif
 137 # ifndef ULLONG_MAX
 138 #  define ULLONG_MAX    (LLONG_MAX * 2ULL + 1)
 139 # endif
 140 #endif
 141
 142 #ifdef  __USE_POSIX
 143 /* POSIX adds things to <limits.h>.  */
 144 # include <bits/posix1_lim.h>
 145 #endif
 146
 147 #ifdef  __USE_POSIX2
 148 # include <bits/posix2_lim.h>
 149 #endif
 150
 151 #ifdef  __USE_XOPEN
 152 # include <bits/xopen_lim.h>
 153 #endif