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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      ANSI 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
  35 #if     __GNUC__ >= 2
  36
  37  /* Get the compiler's limits.h, which defines all the ANSI constants.  */
  38  #ifndef _LIBC_LIMITS_H_
  39  #define _LIBC_LIMITS_H_        /* This tells it not to look for another.  */
  40  #endif
  41  #ifndef _GCC_LIMITS_H_         /* This is what GCC's file defines.  */
  42  #include_next <limits.h>
  43  #endif
  44
  45 #else   /* Not GCC 2.  */
  46
  47 /* We only protect from multiple inclusion here, because all the other
  48    #include's protect themselves, and in GCC 2 we may #include_next through
  49    multiple copies of this file before we get to GCC's.  */
  50 #ifndef _LIMITS_H
  51 #define _LIMITS_H
  52
  53 /* We don't have #include_next.
  54    Define ANSI <limits.h> for standard 32-bit words.  */
  55
  56 /* These assume 8-bit `char's, 16-bit `short int's,
  57    and 32-bit `int's and `long int's.  */
  58
  59 /* Number of bits in a `char'.  */
  60 #define CHAR_BIT        8
  61
  62 /* Maximum length of any multibyte character in any locale.  */
  63 #define MB_LEN_MAX      6
  64
  65 /* Minimum and maximum values a `signed char' can hold.  */
  66 #define SCHAR_MIN       (-128)
  67 #define SCHAR_MAX       127
  68
  69 /* Maximum value an `unsigned char' can hold.  (Minimum is 0.)  */
  70 #ifdef  __STDC__
  71 #define UCHAR_MAX       255U
  72 #else
  73 #define UCHAR_MAX       255
  74 #endif
  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 #ifdef __alpha__
 104
 105 /* Minimum and maximum values a `signed long int' can hold.  */
 106 #define LONG_MAX        9223372036854775807L
 107 #define LONG_MIN        (- LONG_MAX - 1L)
 108
 109 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
 110 #define ULONG_MAX       18446744073709551615L
 111
 112 #else
 113
 114 /* Minimum and maximum values a `signed long int' can hold.  */
 115 #define LONG_MAX        INT_MAX
 116 #define LONG_MIN        INT_MIN
 117
 118 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0.)  */
 119 #define ULONG_MAX       UINT_MAX
 120
 121 #endif
 122
 123
 124 #endif  /* limits.h  */
 125 #endif  /* GCC 2.  */