limits.h

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