include/limits.h

   1 /* Copyright (C) 1991, 1992, 1996, 1997 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 __GNUC__ >= 2
  49
  50  /* Get the compiler's limits.h, which defines all the ANSI constants.  */
  51 # ifndef _GCC_LIMITS_H_         /* This is what GCC's file defines.  */
  52 #  include_next <limits.h>
  53 # endif
  54
  55 #else   /* Not GCC 2.  */
  56
  57 /* We only protect from multiple inclusion here, because all the other
  58    #include's protect themselves, and in GCC 2 we may #include_next through
  59    multiple copies of this file before we get to GCC's.  */
  60 # ifndef _LIMITS_H
  61 #  define _LIMITS_H     1
  62
  63 /* We don't have #include_next.
  64    Define ANSI <limits.h> for standard 32-bit words.  */
  65
  66 /* These assume 8-bit `char's, 16-bit `short int's,
  67    and 32-bit `int's and `long int's.  */
  68
  69 /* Number of bits in a `char'.  */
  70 #  define CHAR_BIT      8
  71
  72 /* Minimum and maximum values a `signed char' can hold.  */
  73 #  define SCHAR_MIN     (-128)
  74 #  define SCHAR_MAX     127
  75
  76 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  77 #  define UCHAR_MAX     255
  78
  79 /* Minimum and maximum values a `char' can hold.  */
  80 #  ifdef __CHAR_UNSIGNED__
  81 #   define CHAR_MIN     0
  82 #   define CHAR_MAX     UCHAR_MAX
  83 #  else
  84 #   define CHAR_MIN     SCHAR_MIN
  85 #   define CHAR_MAX     SCHAR_MAX
  86 #  endif
  87
  88 /* Minimum and maximum values a `signed short int' can hold.  */
  89 #  define SHRT_MIN      (-32768)
  90 #  define SHRT_MAX      32767
  91
  92 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0.)  */
  93 #  define USHRT_MAX     65535
  94
  95 /* Minimum and maximum values a `signed int' can hold.  */
  96 #  define INT_MIN       (-INT_MAX - 1)
  97 #  define INT_MAX       2147483647
  98
  99 /* Maximum value an `unsigned int' can hold.  (Minimum is 0.)  */
 100 #  ifdef __STDC__
 101 #   define UINT_MAX     4294967295U
 102 #  else
 103 #   define UINT_MAX     4294967295
 104 #  endif
 105
 106 /* Minimum and maximum values a `signed long int' can hold.  */
 107 #  ifdef __alpha__
 108 #   define LONG_MAX     9223372036854775807L
 109 #  else
 110 #   define LONG_MAX     2147483647L
 111 #  endif
 112 #  define LONG_MIN      (-LONG_MAX - 1L)
 113
 114 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
 115 #  ifdef __alpha__
 116 #   define ULONG_MAX    18446744073709551615UL
 117 #  else
 118 #   ifdef __STDC__
 119 #    define ULONG_MAX   4294967295UL
 120 #   else
 121 #    define ULONG_MAX   4294967295L
 122 #   endif
 123 #  endif
 124
 125 # endif /* limits.h  */
 126 #endif  /* GCC 2.  */
 127
 128 #endif  /* !_LIBC_LIMITS_H_ */