limits.h

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