include/typemax.h

   1 /* typemax.h -- encapsulate max values for long, long long, etc. */
   2
   3 /* Copyright (C) 2001 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /*
  22  * NOTE:  This should be included after config.h, limits.h, stdint.h, and
  23  *        inttypes.h
  24  */
  25
  26 #ifndef _SH_TYPEMAX_H
  27 #define _SH_TYPEMAX_H
  28
  29 #ifndef CHAR_BIT
  30 #  define CHAR_BIT 8
  31 #endif
  32
  33 /* Nonzero if the integer type T is signed.  */
  34 #ifndef TYPE_SIGNED
  35 #  define TYPE_SIGNED(t)        (! ((t) 0 < (t) -1))
  36 #endif
  37
  38 #ifndef TYPE_MINIMUM
  39 #  define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
  40                                 ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
  41                                 : (t) 0))
  42 #endif
  43
  44 #ifndef TYPE_MAXIMUM
  45 #  define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
  46 #endif
  47
  48 #ifdef HAVE_LONG_LONG
  49 #  ifndef LLONG_MAX
  50 #    define LLONG_MAX   TYPE_MAXIMUM(long long int)
  51 #    define LLONG_MIN   TYPE_MINIMUM(long long int)
  52 #  endif
  53 #  ifndef ULLONG_MAX
  54 #    define ULLONG_MAX  TYPE_MAXIMUM(unsigned long long int)
  55 #  endif
  56 #endif
  57
  58 #ifndef ULONG_MAX
  59 #  define ULONG_MAX     ((unsigned long) ~(unsigned long) 0)
  60 #endif
  61
  62 #ifndef LONG_MAX
  63 #  define LONG_MAX      ((long int) (ULONG_MAX >> 1))
  64 #  define LONG_MIN      ((long int) (-LONG_MAX - 1L))
  65 #endif
  66
  67 #ifndef INT_MAX         /* ouch */
  68 #  define INT_MAX       TYPE_MAXIMUM(int)
  69 #  define INT_MIN       TYPE_MINIMUM(int)
  70 #  define UINT_MAX      ((unsigned int) ~(unsigned int)0)
  71 #endif
  72
  73 /* workaround for gcc bug in versions < 2.7 */
  74 #if defined (HAVE_LONG_LONG) && __GNUC__ == 2 && __GNUC_MINOR__ < 7
  75 static const unsigned long long int maxquad = ULLONG_MAX;
  76 #  undef ULLONG_MAX
  77 #  define ULLONG_MAX maxquad
  78 #endif
  79
  80 #if !defined (INTMAX_MAX) || !defined (INTMAX_MIN)
  81
  82 #if SIZEOF_INTMAX_T == SIZEOF_LONG_LONG
  83 #  define INTMAX_MAX    LLONG_MAX
  84 #  define INTMAX_MIN    LLONG_MIN
  85 #elif SIZEOF_INTMAX_T == SIZEOF_LONG
  86 #  define INTMAX_MAX    LONG_MAX
  87 #  define INTMAX_MIN    LONG_MIN
  88 #else
  89 #  define INTMAX_MAX    INT_MAX
  90 #  define INTMAX_MIN    INT_MIN
  91 #endif
  92
  93 #endif
  94
  95 #ifndef SSIZE_MAX
  96 #  define SSIZE_MAX     32767           /* POSIX minimum max */
  97 #endif
  98
  99 #ifndef SIZE_MAX
 100 #  define SIZE_MAX      65535           /* POSIX minimum max */
 101 #endif
 102
 103 #endif /* _SH_TYPEMAX_H */