include/limits.h

   1 /* Copyright (C) 1991-2015 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h>
  20  */
  21
  22 #ifndef _LIBC_LIMITS_H_
  23 #define _LIBC_LIMITS_H_ 1
  24
  25 #include <features.h>
  26
  27
  28 /* Maximum length of any multibyte character in any locale.
  29    We define this value here since the gcc header does not define
  30    the correct value.  */
  31 #define MB_LEN_MAX      16
  32
  33
  34 /* If we are not using GNU CC we have to define all the symbols ourself.
  35    Otherwise use gcc's definitions (see below).  */
  36 #if !defined __GNUC__ || __GNUC__ < 2
  37
  38 /* We only protect from multiple inclusion here, because all the other
  39    #include's protect themselves, and in GCC 2 we may #include_next through
  40    multiple copies of this file before we get to GCC's.  */
  41 # ifndef _LIMITS_H
  42 #  define _LIMITS_H     1
  43
  44 #include <bits/wordsize.h>
  45
  46 /* We don't have #include_next.
  47    Define ANSI <limits.h> for standard 32-bit words.  */
  48
  49 /* These assume 8-bit `char's, 16-bit `short int's,
  50    and 32-bit `int's and `long int's.  */
  51
  52 /* Number of bits in a `char'.  */
  53 #  define CHAR_BIT      8
  54
  55 /* Minimum and maximum values a `signed char' can hold.  */
  56 #  define SCHAR_MIN     (-128)
  57 #  define SCHAR_MAX     127
  58
  59 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  60 #  define UCHAR_MAX     255
  61
  62 /* Minimum and maximum values a `char' can hold.  */
  63 #  ifdef __CHAR_UNSIGNED__
  64 #   define CHAR_MIN     0
  65 #   define CHAR_MAX     UCHAR_MAX
  66 #  else
  67 #   define CHAR_MIN     SCHAR_MIN
  68 #   define CHAR_MAX     SCHAR_MAX
  69 #  endif
  70
  71 /* Minimum and maximum values a `signed short int' can hold.  */
  72 #  define SHRT_MIN      (-32768)
  73 #  define SHRT_MAX      32767
  74
  75 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0.)  */
  76 #  define USHRT_MAX     65535
  77
  78 /* Minimum and maximum values a `signed int' can hold.  */
  79 #  define INT_MIN       (-INT_MAX - 1)
  80 #  define INT_MAX       2147483647
  81
  82 /* Maximum value an `unsigned int' can hold.  (Minimum is 0.)  */
  83 #  define UINT_MAX      4294967295U
  84
  85 /* Minimum and maximum values a `signed long int' can hold.  */
  86 #  if __WORDSIZE == 64
  87 #   define LONG_MAX     9223372036854775807L
  88 #  else
  89 #   define LONG_MAX     2147483647L
  90 #  endif
  91 #  define LONG_MIN      (-LONG_MAX - 1L)
  92
  93 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
  94 #  if __WORDSIZE == 64
  95 #   define ULONG_MAX    18446744073709551615UL
  96 #  else
  97 #   define ULONG_MAX    4294967295UL
  98 #  endif
  99
 100 #  ifdef __USE_ISOC99
 101
 102 /* Minimum and maximum values a `signed long long int' can hold.  */
 103 #   define LLONG_MAX    9223372036854775807LL
 104 #   define LLONG_MIN    (-LLONG_MAX - 1LL)
 105
 106 /* Maximum value an `unsigned long long int' can hold.  (Minimum is 0.)  */
 107 #   define ULLONG_MAX   18446744073709551615ULL
 108
 109 #  endif /* ISO C99 */
 110
 111 # endif /* limits.h  */
 112 #endif  /* GCC 2.  */
 113
 114 #endif  /* !_LIBC_LIMITS_H_ */
 115
 116  /* Get the compiler's limits.h, which defines almost all the ISO constants.
 117
 118     We put this #include_next outside the double inclusion check because
 119     it should be possible to include this file more than once and still get
 120     the definitions from gcc's header.  */
 121 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
 122 /* `_GCC_LIMITS_H_' is what GCC's file defines.  */
 123 # include_next <limits.h>
 124 #endif
 125
 126 /* The <limits.h> files in some gcc versions don't define LLONG_MIN,
 127    LLONG_MAX, and ULLONG_MAX.  Instead only the values gcc defined for
 128    ages are available.  */
 129 #if defined __USE_ISOC99 && defined __GNUC__
 130 # ifndef LLONG_MIN
 131 #  define LLONG_MIN     (-LLONG_MAX-1)
 132 # endif
 133 # ifndef LLONG_MAX
 134 #  define LLONG_MAX     __LONG_LONG_MAX__
 135 # endif
 136 # ifndef ULLONG_MAX
 137 #  define ULLONG_MAX    (LLONG_MAX * 2ULL + 1)
 138 # endif
 139 #endif
 140
 141 #ifdef  __USE_POSIX
 142 /* POSIX adds things to <limits.h>.  */
 143 # include <bits/posix1_lim.h>
 144 #endif
 145
 146 #ifdef  __USE_POSIX2
 147 # include <bits/posix2_lim.h>
 148 #endif
 149
 150 #ifdef  __USE_XOPEN
 151 # include <bits/xopen_lim.h>
 152 #endif