include/limits.h

   1 /* Copyright (C) 1991, 92, 96, 97, 98, 99, 2000 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  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 /* We don't have #include_next.
  46    Define ANSI <limits.h> for standard 32-bit words.  */
  47
  48 /* These assume 8-bit `char's, 16-bit `short int's,
  49    and 32-bit `int's and `long int's.  */
  50
  51 /* Number of bits in a `char'.  */
  52 #  define CHAR_BIT      8
  53
  54 /* Minimum and maximum values a `signed char' can hold.  */
  55 #  define SCHAR_MIN     (-128)
  56 #  define SCHAR_MAX     127
  57
  58 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  59 #  define UCHAR_MAX     255
  60
  61 /* Minimum and maximum values a `char' can hold.  */
  62 #  ifdef __CHAR_UNSIGNED__
  63 #   define CHAR_MIN     0
  64 #   define CHAR_MAX     UCHAR_MAX
  65 #  else
  66 #   define CHAR_MIN     SCHAR_MIN
  67 #   define CHAR_MAX     SCHAR_MAX
  68 #  endif
  69
  70 /* Minimum and maximum values a `signed short int' can hold.  */
  71 #  define SHRT_MIN      (-32768)
  72 #  define SHRT_MAX      32767
  73
  74 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0.)  */
  75 #  define USHRT_MAX     65535
  76
  77 /* Minimum and maximum values a `signed int' can hold.  */
  78 #  define INT_MIN       (-INT_MAX - 1)
  79 #  define INT_MAX       2147483647
  80
  81 /* Maximum value an `unsigned int' can hold.  (Minimum is 0.)  */
  82 #  define UINT_MAX      4294967295U
  83
  84 /* Minimum and maximum values a `signed long int' can hold.  */
  85 #  ifdef __alpha__
  86 #   define LONG_MAX     9223372036854775807L
  87 #  else
  88 #   define LONG_MAX     2147483647L
  89 #  endif
  90 #  define LONG_MIN      (-LONG_MAX - 1L)
  91
  92 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
  93 #  ifdef __alpha__
  94 #   define ULONG_MAX    18446744073709551615UL
  95 #  else
  96 #   define ULONG_MAX    4294967295UL
  97 #  endif
  98
  99 #  ifdef __USE_ISOC99
 100
 101 /* Minimum and maximum values a `signed long long int' can hold.  */
 102 #   define LLONG_MAX    9223372036854775807LL
 103 #   define LLONG_MIN    (-LLONG_MAX - 1LL)
 104
 105 /* Maximum value an `unsigned long long int' can hold.  (Minimum is 0.)  */
 106 #   define ULLONG_MAX   18446744073709551615ULL
 107
 108 #  endif /* ISO C99 */
 109
 110 # endif /* limits.h  */
 111 #endif  /* GCC 2.  */
 112
 113 #endif  /* !_LIBC_LIMITS_H_ */
 114
 115  /* Get the compiler's limits.h, which defines almost all the ISO constants.
 116
 117     We put this #include_next outside the double inclusion check because
 118     it should be possible to include this file more than once and still get
 119     the definitions from gcc's header.  */
 120 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
 121 /* `_GCC_LIMITS_H_' is what GCC's file defines.  */
 122 # include_next <limits.h>
 123
 124 /* The <limits.h> files in some gcc versions don't define LLONG_MIN,
 125    LLONG_MAX, and ULLONG_MAX.  Instead only the values gcc defined for
 126    ages are available.  */
 127 # ifdef __USE_ISOC99
 128 #  ifndef LLONG_MIN
 129 #   define LLONG_MIN    LONG_LONG_MIN
 130 #  endif
 131 #  ifndef LLONG_MAX
 132 #   define LLONG_MAX    LONG_LONG_MAX
 133 #  endif
 134 #  ifndef ULLONG_MAX
 135 #   define ULLONG_MAX   ULONG_LONG_MAX
 136 #  endif
 137 # endif
 138 #endif
 139
 140 #ifdef  __USE_POSIX
 141 /* POSIX adds things to <limits.h>.  */
 142 # include <bits/posix1_lim.h>
 143 #endif
 144
 145 #ifdef  __USE_POSIX2
 146 # include <bits/posix2_lim.h>
 147 #endif
 148
 149 #ifdef  __USE_XOPEN
 150 # include <bits/xopen_lim.h>
 151 #endif