103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
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/*===---- limits.h - Standard header for integer sizes --------------------===*\
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*
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\*===----------------------------------------------------------------------===*/
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#ifndef __CLANG_LIMITS_H
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#define __CLANG_LIMITS_H
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/* The system's limits.h may, in turn, try to #include_next GCC's limits.h.
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Avert this #include_next madness. */
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#if defined __GNUC__ && !defined _GCC_LIMITS_H_
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#define _GCC_LIMITS_H_
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#endif
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/* System headers include a number of constants from POSIX in <limits.h>.
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Include it if we're hosted. */
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#if __STDC_HOSTED__ && __has_include_next(<limits.h>)
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#include_next <limits.h>
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#endif
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/* Many system headers try to "help us out" by defining these. No really, we
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know how big each datatype is. */
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#undef SCHAR_MIN
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#undef SCHAR_MAX
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#undef UCHAR_MAX
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#undef SHRT_MIN
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#undef SHRT_MAX
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#undef USHRT_MAX
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#undef INT_MIN
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#undef INT_MAX
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#undef UINT_MAX
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#undef LONG_MIN
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#undef LONG_MAX
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#undef ULONG_MAX
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#undef CHAR_BIT
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#undef CHAR_MIN
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#undef CHAR_MAX
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/* C90/99 5.2.4.2.1 */
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#define SCHAR_MAX __SCHAR_MAX__
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#define SHRT_MAX __SHRT_MAX__
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#define INT_MAX __INT_MAX__
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#define LONG_MAX __LONG_MAX__
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#define SCHAR_MIN (-__SCHAR_MAX__-1)
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#define SHRT_MIN (-__SHRT_MAX__ -1)
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#define INT_MIN (-__INT_MAX__ -1)
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#define LONG_MIN (-__LONG_MAX__ -1L)
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#define UCHAR_MAX (__SCHAR_MAX__*2 +1)
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#define USHRT_MAX (__SHRT_MAX__ *2 +1)
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#define UINT_MAX (__INT_MAX__ *2U +1U)
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#define ULONG_MAX (__LONG_MAX__ *2UL+1UL)
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#ifndef MB_LEN_MAX
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#define MB_LEN_MAX 1
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#endif
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#define CHAR_BIT __CHAR_BIT__
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#ifdef __CHAR_UNSIGNED__ /* -funsigned-char */
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#define CHAR_MIN 0
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#define CHAR_MAX UCHAR_MAX
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#else
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#define CHAR_MIN SCHAR_MIN
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#define CHAR_MAX __SCHAR_MAX__
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#endif
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/* C99 5.2.4.2.1: Added long long.
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C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>.
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*/
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#if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L
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#undef LLONG_MIN
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#undef LLONG_MAX
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#undef ULLONG_MAX
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#define LLONG_MAX __LONG_LONG_MAX__
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#define LLONG_MIN (-__LONG_LONG_MAX__-1LL)
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#define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
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#endif
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/* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad
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that we don't have something like #pragma poison that could be used to
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deprecate a macro - the code should just use LLONG_MAX and friends.
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*/
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#if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
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#undef LONG_LONG_MIN
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#undef LONG_LONG_MAX
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#undef ULONG_LONG_MAX
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#define LONG_LONG_MAX __LONG_LONG_MAX__
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#define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL)
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#define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
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#endif
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#endif /* __CLANG_LIMITS_H */
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