include/limits.h

   1 /* Copyright (C) 1991, 1992, 1996, 1997, 1998 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 C Standard: 4.14/2.2.4.2 Limits of integral types   <limits.h>
  21  */
  22
  23 #ifndef _LIBC_LIMITS_H_
  24 #define _LIBC_LIMITS_H_ 1
  25
  26 #include <features.h>
  27
  28 #ifdef  __USE_POSIX
  29 /* POSIX adds things to <limits.h>.  */
  30 # include <bits/posix1_lim.h>
  31 #endif
  32
  33 #ifdef  __USE_POSIX2
  34 # include <bits/posix2_lim.h>
  35 #endif
  36
  37 #ifdef  __USE_XOPEN
  38 # include <bits/xopen_lim.h>
  39 #endif
  40
  41
  42 /* Maximum length of any multibyte character in any locale.
  43    We define this value here since the gcc header does not define
  44    the correct value.  */
  45 #define MB_LEN_MAX      6
  46
  47
  48 /* If we are not using GNU CC we have to define all the symbols ourself.
  49    Otherwise use gcc's definitions (see below).  */
  50 #if !defined __GNUC__ || __GNUC__ < 2
  51
  52 /* We only protect from multiple inclusion here, because all the other
  53    #include's protect themselves, and in GCC 2 we may #include_next through
  54    multiple copies of this file before we get to GCC's.  */
  55 # ifndef _LIMITS_H
  56 #  define _LIMITS_H     1
  57
  58 /* We don't have #include_next.
  59    Define ANSI <limits.h> for standard 32-bit words.  */
  60
  61 /* These assume 8-bit `char's, 16-bit `short int's,
  62    and 32-bit `int's and `long int's.  */
  63
  64 /* Number of bits in a `char'.  */
  65 #  define CHAR_BIT      8
  66
  67 /* Minimum and maximum values a `signed char' can hold.  */
  68 #  define SCHAR_MIN     (-128)
  69 #  define SCHAR_MAX     127
  70
  71 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  72 #  define UCHAR_MAX     255
  73
  74 /* Minimum and maximum values a `char' can hold.  */
  75 #  ifdef __CHAR_UNSIGNED__
  76 #   define CHAR_MIN     0
  77 #   define CHAR_MAX     UCHAR_MAX
  78 #  else
  79 #   define CHAR_MIN     SCHAR_MIN
  80 #   define CHAR_MAX     SCHAR_MAX
  81 #  endif
  82
  83 /* Minimum and maximum values a `signed short int' can hold.  */
  84 #  define SHRT_MIN      (-32768)
  85 #  define SHRT_MAX      32767
  86
  87 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0.)  */
  88 #  define USHRT_MAX     65535
  89
  90 /* Minimum and maximum values a `signed int' can hold.  */
  91 #  define INT_MIN       (-INT_MAX - 1)
  92 #  define INT_MAX       2147483647
  93
  94 /* Maximum value an `unsigned int' can hold.  (Minimum is 0.)  */
  95 #  ifdef __STDC__
  96 #   define UINT_MAX     4294967295U
  97 #  else
  98 #   define UINT_MAX     4294967295
  99 #  endif
 100
 101 /* Minimum and maximum values a `signed long int' can hold.  */
 102 #  ifdef __alpha__
 103 #   define LONG_MAX     9223372036854775807L
 104 #  else
 105 #   define LONG_MAX     2147483647L
 106 #  endif
 107 #  define LONG_MIN      (-LONG_MAX - 1L)
 108
 109 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
 110 #  ifdef __alpha__
 111 #   define ULONG_MAX    18446744073709551615UL
 112 #  else
 113 #   ifdef __STDC__
 114 #    define ULONG_MAX   4294967295UL
 115 #   else
 116 #    define ULONG_MAX   4294967295L
 117 #   endif
 118 #  endif
 119
 120 # endif /* limits.h  */
 121 #endif  /* GCC 2.  */
 122
 123 #endif  /* !_LIBC_LIMITS_H_ */
 124
 125  /* Get the compiler's limits.h, which defines almost all the ISO constants.
 126
 127     We put this #include_next outside the double inclusion check because
 128     it should be possible to include this file more than once and still get
 129     the definitions from gcc's header.  */
 130 #if defined __GNUC__ && !defined _GCC_LIMITS_H_
 131 /* `_GCC_LIMITS_H_' is what GCC's file defines.  */
 132 # include_next <limits.h>
 133 #endif