lib/limits.in.h

   1 /* A GNU-like <limits.h>.
   2
   3    Copyright 2016-2024 Free Software Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #if __GNUC__ >= 3
  19 @PRAGMA_SYSTEM_HEADER@
  20 #endif
  21 @PRAGMA_COLUMNS@
  22
  23 #if defined _GL_ALREADY_INCLUDING_LIMITS_H
  24 /* Special invocation convention:
  25    On Haiku/x86_64, we have a sequence of nested includes
  26    <limits.h> -> <syslimits.h> -> <limits.h>.
  27    In this situation, LONG_MAX and INT_MAX are not yet defined,
  28    therefore we should not attempt to define LONG_BIT.  */
  29
  30 #@INCLUDE_NEXT@ @NEXT_LIMITS_H@
  31
  32 #else
  33 /* Normal invocation convention.  */
  34
  35 #ifndef _@GUARD_PREFIX@_LIMITS_H
  36
  37 # define _GL_ALREADY_INCLUDING_LIMITS_H
  38
  39 /* The include_next requires a split double-inclusion guard.  */
  40 # @INCLUDE_NEXT@ @NEXT_LIMITS_H@
  41
  42 # undef _GL_ALREADY_INCLUDING_LIMITS_H
  43
  44 #ifndef _@GUARD_PREFIX@_LIMITS_H
  45 #define _@GUARD_PREFIX@_LIMITS_H
  46
  47 #ifndef LLONG_MIN
  48 # if defined LONG_LONG_MIN /* HP-UX 11.31 */
  49 #  define LLONG_MIN LONG_LONG_MIN
  50 # elif defined LONGLONG_MIN /* IRIX 6.5 */
  51 #  define LLONG_MIN LONGLONG_MIN
  52 # elif defined __GNUC__
  53 #  define LLONG_MIN (- __LONG_LONG_MAX__ - 1LL)
  54 # endif
  55 #endif
  56 #ifndef LLONG_MAX
  57 # if defined LONG_LONG_MAX /* HP-UX 11.31 */
  58 #  define LLONG_MAX LONG_LONG_MAX
  59 # elif defined LONGLONG_MAX /* IRIX 6.5 */
  60 #  define LLONG_MAX LONGLONG_MAX
  61 # elif defined __GNUC__
  62 #  define LLONG_MAX __LONG_LONG_MAX__
  63 # endif
  64 #endif
  65 #ifndef ULLONG_MAX
  66 # if defined ULONG_LONG_MAX /* HP-UX 11.31 */
  67 #  define ULLONG_MAX ULONG_LONG_MAX
  68 # elif defined ULONGLONG_MAX /* IRIX 6.5 */
  69 #  define ULLONG_MAX ULONGLONG_MAX
  70 # elif defined __GNUC__
  71 #  define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1ULL)
  72 # endif
  73 #endif
  74
  75 /* The number of usable bits in an unsigned or signed integer type
  76    with minimum value MIN and maximum value MAX, as an int expression
  77    suitable in #if.  Cover all known practical hosts.  This
  78    implementation exploits the fact that MAX is 1 less than a power of
  79    2, and merely counts the number of 1 bits in MAX; "COBn" means
  80    "count the number of 1 bits in the low-order n bits").  */
  81 #define _GL_INTEGER_WIDTH(min, max) (((min) < 0) + _GL_COB128 (max))
  82 #define _GL_COB128(n) (_GL_COB64 ((n) >> 31 >> 31 >> 2) + _GL_COB64 (n))
  83 #define _GL_COB64(n) (_GL_COB32 ((n) >> 31 >> 1) + _GL_COB32 (n))
  84 #define _GL_COB32(n) (_GL_COB16 ((n) >> 16) + _GL_COB16 (n))
  85 #define _GL_COB16(n) (_GL_COB8 ((n) >> 8) + _GL_COB8 (n))
  86 #define _GL_COB8(n) (_GL_COB4 ((n) >> 4) + _GL_COB4 (n))
  87 #define _GL_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + !!((n) & 1))
  88
  89 #ifndef WORD_BIT
  90 /* Assume 'int' is 32 bits wide.  */
  91 # define WORD_BIT 32
  92 #endif
  93 #ifndef LONG_BIT
  94 /* Assume 'long' is 32 or 64 bits wide.  */
  95 # if LONG_MAX == INT_MAX
  96 #  define LONG_BIT 32
  97 # else
  98 #  define LONG_BIT 64
  99 # endif
 100 #endif
 101
 102 /* Assume no multibyte character is longer than 16 bytes.  */
 103 #ifndef MB_LEN_MAX
 104 # define MB_LEN_MAX 16
 105 #endif
 106
 107 /* Macros specified by C23 and by ISO/IEC TS 18661-1:2014.  */
 108
 109 #if (! defined ULLONG_WIDTH                                             \
 110      && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__ \
 111          || (defined __STDC_VERSION__ && 201710 < __STDC_VERSION__)))
 112 # define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX)
 113 # define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX)
 114 # define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX)
 115 # define SHRT_WIDTH _GL_INTEGER_WIDTH (SHRT_MIN, SHRT_MAX)
 116 # define USHRT_WIDTH _GL_INTEGER_WIDTH (0, USHRT_MAX)
 117 # define INT_WIDTH _GL_INTEGER_WIDTH (INT_MIN, INT_MAX)
 118 # define UINT_WIDTH _GL_INTEGER_WIDTH (0, UINT_MAX)
 119 # define LONG_WIDTH _GL_INTEGER_WIDTH (LONG_MIN, LONG_MAX)
 120 # define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX)
 121 # define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX)
 122 # define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX)
 123 #endif
 124
 125 /* Macros specified by C23.  */
 126
 127 #if (defined _GNU_SOURCE \
 128      || (defined __STDC_VERSION__ && 201710 < __STDC_VERSION__))
 129 # if ! defined BOOL_WIDTH
 130 #  define BOOL_WIDTH 1
 131 #  define BOOL_MAX 1
 132 # elif ! defined BOOL_MAX
 133 #  define BOOL_MAX 1
 134 # endif
 135 #endif
 136
 137 /* Macro specified by POSIX.  */
 138
 139 /* The maximum ssize_t value.  Although it might not be of ssize_t type
 140    as it should be, it's too much trouble to fix this minor detail.  */
 141 #ifndef SSIZE_MAX
 142 # ifdef _WIN64
 143 #  define SSIZE_MAX LLONG_MAX
 144 # else
 145 #  define SSIZE_MAX LONG_MAX
 146 # endif
 147 #endif
 148
 149 #endif /* _@GUARD_PREFIX@_LIMITS_H */
 150 #endif /* _@GUARD_PREFIX@_LIMITS_H */
 151 #endif