root/lib/limits.in.h

     1 /* A GNU-like <limits.h>.
     2 
     3    Copyright 2016-2023 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 ((((1U << (BOOL_WIDTH - 1)) - 1) << 1) + 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