1/*===---- limits.h - Standard header for integer sizes --------------------===*\ 2 * 3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 * See https://llvm.org/LICENSE.txt for license information. 5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 * 7\*===----------------------------------------------------------------------===*/ 8 9#ifndef __CLANG_LIMITS_H 10#define __CLANG_LIMITS_H 11 12/* The system's limits.h may, in turn, try to #include_next GCC's limits.h. 13 Avert this #include_next madness. */ 14#if defined __GNUC__ && !defined _GCC_LIMITS_H_ 15#define _GCC_LIMITS_H_ 16#endif 17 18/* System headers include a number of constants from POSIX in <limits.h>. 19 Include it if we're hosted. */ 20#if __STDC_HOSTED__ && __has_include_next(<limits.h>) 21#include_next <limits.h> 22#endif 23 24/* Many system headers try to "help us out" by defining these. No really, we 25 know how big each datatype is. */ 26#undef SCHAR_MIN 27#undef SCHAR_MAX 28#undef UCHAR_MAX 29#undef SHRT_MIN 30#undef SHRT_MAX 31#undef USHRT_MAX 32#undef INT_MIN 33#undef INT_MAX 34#undef UINT_MAX 35#undef LONG_MIN 36#undef LONG_MAX 37#undef ULONG_MAX 38 39#undef CHAR_BIT 40#undef CHAR_MIN 41#undef CHAR_MAX 42 43/* C90/99 5.2.4.2.1 */ 44#define SCHAR_MAX __SCHAR_MAX__ 45#define SHRT_MAX __SHRT_MAX__ 46#define INT_MAX __INT_MAX__ 47#define LONG_MAX __LONG_MAX__ 48 49#define SCHAR_MIN (-__SCHAR_MAX__-1) 50#define SHRT_MIN (-__SHRT_MAX__ -1) 51#define INT_MIN (-__INT_MAX__ -1) 52#define LONG_MIN (-__LONG_MAX__ -1L) 53 54#define UCHAR_MAX (__SCHAR_MAX__*2 +1) 55#define USHRT_MAX (__SHRT_MAX__ *2 +1) 56#define UINT_MAX (__INT_MAX__ *2U +1U) 57#define ULONG_MAX (__LONG_MAX__ *2UL+1UL) 58 59#ifndef MB_LEN_MAX 60#define MB_LEN_MAX 1 61#endif 62 63#define CHAR_BIT __CHAR_BIT__ 64 65#ifdef __CHAR_UNSIGNED__ /* -funsigned-char */ 66#define CHAR_MIN 0 67#define CHAR_MAX UCHAR_MAX 68#else 69#define CHAR_MIN SCHAR_MIN 70#define CHAR_MAX __SCHAR_MAX__ 71#endif 72 73/* C99 5.2.4.2.1: Added long long. 74 C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>. 75 */ 76#if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L 77 78#undef LLONG_MIN 79#undef LLONG_MAX 80#undef ULLONG_MAX 81 82#define LLONG_MAX __LONG_LONG_MAX__ 83#define LLONG_MIN (-__LONG_LONG_MAX__-1LL) 84#define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 85#endif 86 87/* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad 88 that we don't have something like #pragma poison that could be used to 89 deprecate a macro - the code should just use LLONG_MAX and friends. 90 */ 91#if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__) 92 93#undef LONG_LONG_MIN 94#undef LONG_LONG_MAX 95#undef ULONG_LONG_MAX 96 97#define LONG_LONG_MAX __LONG_LONG_MAX__ 98#define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL) 99#define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 100#endif 101 102#endif /* __CLANG_LIMITS_H */ 103