limits.in.h 4.21 KB
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/* A GNU-like <limits.h>.

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   Copyright 2016-2020 Free Software Foundation, Inc.
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   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 3, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
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   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
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#if __GNUC__ >= 3
@PRAGMA_SYSTEM_HEADER@
#endif
@PRAGMA_COLUMNS@

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#if defined _GL_ALREADY_INCLUDING_LIMITS_H
/* Special invocation convention:
   On Haiku/x86_64, we have a sequence of nested includes
   <limits.h> -> <syslimits.h> -> <limits.h>.
   In this situation, LONG_MAX and INT_MAX are not yet defined,
   therefore we should not attempt to define LONG_BIT.  */

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#@INCLUDE_NEXT@ @NEXT_LIMITS_H@

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#else
/* Normal invocation convention.  */

#ifndef _@GUARD_PREFIX@_LIMITS_H

# define _GL_ALREADY_INCLUDING_LIMITS_H

/* The include_next requires a split double-inclusion guard.  */
# @INCLUDE_NEXT@ @NEXT_LIMITS_H@

# undef _GL_ALREADY_INCLUDING_LIMITS_H

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#ifndef _@GUARD_PREFIX@_LIMITS_H
#define _@GUARD_PREFIX@_LIMITS_H

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#ifndef LLONG_MIN
# if defined LONG_LONG_MIN /* HP-UX 11.31 */
#  define LLONG_MIN LONG_LONG_MIN
# elif defined LONGLONG_MIN /* IRIX 6.5 */
#  define LLONG_MIN LONGLONG_MIN
# elif defined __GNUC__
#  define LLONG_MIN (- __LONG_LONG_MAX__ - 1LL)
# endif
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#endif
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#ifndef LLONG_MAX
# if defined LONG_LONG_MAX /* HP-UX 11.31 */
#  define LLONG_MAX LONG_LONG_MAX
# elif defined LONGLONG_MAX /* IRIX 6.5 */
#  define LLONG_MAX LONGLONG_MAX
# elif defined __GNUC__
#  define LLONG_MAX __LONG_LONG_MAX__
# endif
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#endif
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#ifndef ULLONG_MAX
# if defined ULONG_LONG_MAX /* HP-UX 11.31 */
#  define ULLONG_MAX ULONG_LONG_MAX
# elif defined ULONGLONG_MAX /* IRIX 6.5 */
#  define ULLONG_MAX ULONGLONG_MAX
# elif defined __GNUC__
#  define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1ULL)
# endif
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#endif

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/* The number of usable bits in an unsigned or signed integer type
   with minimum value MIN and maximum value MAX, as an int expression
   suitable in #if.  Cover all known practical hosts.  This
   implementation exploits the fact that MAX is 1 less than a power of
   2, and merely counts the number of 1 bits in MAX; "COBn" means
   "count the number of 1 bits in the low-order n bits").  */
#define _GL_INTEGER_WIDTH(min, max) (((min) < 0) + _GL_COB128 (max))
#define _GL_COB128(n) (_GL_COB64 ((n) >> 31 >> 31 >> 2) + _GL_COB64 (n))
#define _GL_COB64(n) (_GL_COB32 ((n) >> 31 >> 1) + _GL_COB32 (n))
#define _GL_COB32(n) (_GL_COB16 ((n) >> 16) + _GL_COB16 (n))
#define _GL_COB16(n) (_GL_COB8 ((n) >> 8) + _GL_COB8 (n))
#define _GL_COB8(n) (_GL_COB4 ((n) >> 4) + _GL_COB4 (n))
#define _GL_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + !!((n) & 1))

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#ifndef WORD_BIT
/* Assume 'int' is 32 bits wide.  */
# define WORD_BIT 32
#endif
#ifndef LONG_BIT
/* Assume 'long' is 32 or 64 bits wide.  */
# if LONG_MAX == INT_MAX
#  define LONG_BIT 32
# else
#  define LONG_BIT 64
# endif
#endif

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/* Macros specified by ISO/IEC TS 18661-1:2014.  */

#if (! defined ULLONG_WIDTH                                             \
     && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__))
# define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX)
# define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX)
# define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX)
# define SHRT_WIDTH _GL_INTEGER_WIDTH (SHRT_MIN, SHRT_MAX)
# define USHRT_WIDTH _GL_INTEGER_WIDTH (0, USHRT_MAX)
# define INT_WIDTH _GL_INTEGER_WIDTH (INT_MIN, INT_MAX)
# define UINT_WIDTH _GL_INTEGER_WIDTH (0, UINT_MAX)
# define LONG_WIDTH _GL_INTEGER_WIDTH (LONG_MIN, LONG_MAX)
# define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX)
# define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX)
# define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX)
#endif /* !ULLONG_WIDTH && (_GNU_SOURCE || __STDC_WANT_IEC_60559_BFP_EXT__) */

#endif /* _@GUARD_PREFIX@_LIMITS_H */
#endif /* _@GUARD_PREFIX@_LIMITS_H */
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#endif