include/limits.h

   1 /* Copyright (C) 1991-2022 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    <https://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 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
  26 #include <bits/libc-header-start.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 /* The integer width macros are not defined by GCC's <limits.h> before
 143    GCC 7, or if _GNU_SOURCE rather than
 144    __STDC_WANT_IEC_60559_BFP_EXT__ is used to enable this feature.  */
 145 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
 146 # ifndef CHAR_WIDTH
 147 #  define CHAR_WIDTH 8
 148 # endif
 149 # ifndef SCHAR_WIDTH
 150 #  define SCHAR_WIDTH 8
 151 # endif
 152 # ifndef UCHAR_WIDTH
 153 #  define UCHAR_WIDTH 8
 154 # endif
 155 # ifndef SHRT_WIDTH
 156 #  define SHRT_WIDTH 16
 157 # endif
 158 # ifndef USHRT_WIDTH
 159 #  define USHRT_WIDTH 16
 160 # endif
 161 # ifndef INT_WIDTH
 162 #  define INT_WIDTH 32
 163 # endif
 164 # ifndef UINT_WIDTH
 165 #  define UINT_WIDTH 32
 166 # endif
 167 # ifndef LONG_WIDTH
 168 #  define LONG_WIDTH __WORDSIZE
 169 # endif
 170 # ifndef ULONG_WIDTH
 171 #  define ULONG_WIDTH __WORDSIZE
 172 # endif
 173 # ifndef LLONG_WIDTH
 174 #  define LLONG_WIDTH 64
 175 # endif
 176 # ifndef ULLONG_WIDTH
 177 #  define ULLONG_WIDTH 64
 178 # endif
 179 #endif /* Use IEC_60559_BFP_EXT.  */
 180
 181 /* The macros for _Bool are not defined by GCC's <limits.h> before GCC
 182    11, or if _GNU_SOURCE is defined rather than enabling C2x support
 183    with -std.  */
 184 #if __GLIBC_USE (ISOC2X)
 185 # ifndef BOOL_MAX
 186 #  define BOOL_MAX 1
 187 # endif
 188 # ifndef BOOL_WIDTH
 189 #  define BOOL_WIDTH 1
 190 # endif
 191 #endif
 192
 193 #ifdef  __USE_POSIX
 194 /* POSIX adds things to <limits.h>.  */
 195 # include <bits/posix1_lim.h>
 196 #endif
 197
 198 #ifdef  __USE_POSIX2
 199 # include <bits/posix2_lim.h>
 200 #endif
 201
 202 #ifdef  __USE_XOPEN
 203 # include <bits/xopen_lim.h>
 204 #endif