limits.h (3794B) - Raw
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 #if defined(__MVS__) && __has_include_next(<limits.h>) 13 #include_next <limits.h> 14 #else 15 16 /* The system's limits.h may, in turn, try to #include_next GCC's limits.h. 17 Avert this #include_next madness. */ 18 #if defined __GNUC__ && !defined _GCC_LIMITS_H_ 19 #define _GCC_LIMITS_H_ 20 #endif 21 22 /* System headers include a number of constants from POSIX in <limits.h>. 23 Include it if we're hosted. */ 24 #if __STDC_HOSTED__ && __has_include_next(<limits.h>) 25 #include_next <limits.h> 26 #endif 27 28 /* Many system headers try to "help us out" by defining these. No really, we 29 know how big each datatype is. */ 30 #undef SCHAR_MIN 31 #undef SCHAR_MAX 32 #undef UCHAR_MAX 33 #undef SHRT_MIN 34 #undef SHRT_MAX 35 #undef USHRT_MAX 36 #undef INT_MIN 37 #undef INT_MAX 38 #undef UINT_MAX 39 #undef LONG_MIN 40 #undef LONG_MAX 41 #undef ULONG_MAX 42 43 #undef CHAR_BIT 44 #undef CHAR_MIN 45 #undef CHAR_MAX 46 47 /* C90/99 5.2.4.2.1 */ 48 #define SCHAR_MAX __SCHAR_MAX__ 49 #define SHRT_MAX __SHRT_MAX__ 50 #define INT_MAX __INT_MAX__ 51 #define LONG_MAX __LONG_MAX__ 52 53 #define SCHAR_MIN (-__SCHAR_MAX__-1) 54 #define SHRT_MIN (-__SHRT_MAX__ -1) 55 #define INT_MIN (-__INT_MAX__ -1) 56 #define LONG_MIN (-__LONG_MAX__ -1L) 57 58 #define UCHAR_MAX (__SCHAR_MAX__*2 +1) 59 #if __SHRT_WIDTH__ < __INT_WIDTH__ 60 #define USHRT_MAX (__SHRT_MAX__ * 2 + 1) 61 #else 62 #define USHRT_MAX (__SHRT_MAX__ * 2U + 1U) 63 #endif 64 #define UINT_MAX (__INT_MAX__ *2U +1U) 65 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL) 66 67 #ifndef MB_LEN_MAX 68 #define MB_LEN_MAX 1 69 #endif 70 71 #define CHAR_BIT __CHAR_BIT__ 72 73 /* C23 5.2.4.2.1 */ 74 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L 75 #define BOOL_WIDTH __BOOL_WIDTH__ 76 #define CHAR_WIDTH CHAR_BIT 77 #define SCHAR_WIDTH CHAR_BIT 78 #define UCHAR_WIDTH CHAR_BIT 79 #define USHRT_WIDTH __SHRT_WIDTH__ 80 #define SHRT_WIDTH __SHRT_WIDTH__ 81 #define UINT_WIDTH __INT_WIDTH__ 82 #define INT_WIDTH __INT_WIDTH__ 83 #define ULONG_WIDTH __LONG_WIDTH__ 84 #define LONG_WIDTH __LONG_WIDTH__ 85 #define ULLONG_WIDTH __LLONG_WIDTH__ 86 #define LLONG_WIDTH __LLONG_WIDTH__ 87 88 #define BITINT_MAXWIDTH __BITINT_MAXWIDTH__ 89 #endif 90 91 #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */ 92 #define CHAR_MIN 0 93 #define CHAR_MAX UCHAR_MAX 94 #else 95 #define CHAR_MIN SCHAR_MIN 96 #define CHAR_MAX __SCHAR_MAX__ 97 #endif 98 99 /* C99 5.2.4.2.1: Added long long. 100 C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>. 101 */ 102 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \ 103 (defined(__cplusplus) && __cplusplus >= 201103L) 104 105 #undef LLONG_MIN 106 #undef LLONG_MAX 107 #undef ULLONG_MAX 108 109 #define LLONG_MAX __LONG_LONG_MAX__ 110 #define LLONG_MIN (-__LONG_LONG_MAX__-1LL) 111 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 112 #endif 113 114 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. Android's 115 bionic also defines them. It's too bad that we don't have something like 116 #pragma poison that could be used to deprecate a macro - the code should just 117 use LLONG_MAX and friends. 118 */ 119 #if (defined(__GNU_LIBRARY__) ? defined(__USE_GNU) \ 120 : !defined(__STRICT_ANSI__)) || \ 121 defined(__BIONIC__) 122 123 #undef LONG_LONG_MIN 124 #undef LONG_LONG_MAX 125 #undef ULONG_LONG_MAX 126 127 #define LONG_LONG_MAX __LONG_LONG_MAX__ 128 #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL) 129 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 130 #endif 131 132 #endif /* __MVS__ */ 133 #endif /* __CLANG_LIMITS_H */