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 #if __SHRT_WIDTH__ < __INT_WIDTH__ 56 #define USHRT_MAX (__SHRT_MAX__ * 2 + 1) 57 #else 58 #define USHRT_MAX (__SHRT_MAX__ * 2U + 1U) 59 #endif 60 #define UINT_MAX (__INT_MAX__ *2U +1U) 61 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL) 62 63 #ifndef MB_LEN_MAX 64 #define MB_LEN_MAX 1 65 #endif 66 67 #define CHAR_BIT __CHAR_BIT__ 68 69 /* C23 5.2.4.2.1 */ 70 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L 71 #define BOOL_WIDTH __BOOL_WIDTH__ 72 #define CHAR_WIDTH CHAR_BIT 73 #define SCHAR_WIDTH CHAR_BIT 74 #define UCHAR_WIDTH CHAR_BIT 75 #define USHRT_WIDTH __SHRT_WIDTH__ 76 #define SHRT_WIDTH __SHRT_WIDTH__ 77 #define UINT_WIDTH __INT_WIDTH__ 78 #define INT_WIDTH __INT_WIDTH__ 79 #define ULONG_WIDTH __LONG_WIDTH__ 80 #define LONG_WIDTH __LONG_WIDTH__ 81 #define ULLONG_WIDTH __LLONG_WIDTH__ 82 #define LLONG_WIDTH __LLONG_WIDTH__ 83 84 #define BITINT_MAXWIDTH __BITINT_MAXWIDTH__ 85 #endif 86 87 #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */ 88 #define CHAR_MIN 0 89 #define CHAR_MAX UCHAR_MAX 90 #else 91 #define CHAR_MIN SCHAR_MIN 92 #define CHAR_MAX __SCHAR_MAX__ 93 #endif 94 95 /* C99 5.2.4.2.1: Added long long. 96 C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>. 97 */ 98 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \ 99 (defined(__cplusplus) && __cplusplus >= 201103L) 100 101 #undef LLONG_MIN 102 #undef LLONG_MAX 103 #undef ULLONG_MAX 104 105 #define LLONG_MAX __LONG_LONG_MAX__ 106 #define LLONG_MIN (-__LONG_LONG_MAX__-1LL) 107 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 108 #endif 109 110 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad 111 that we don't have something like #pragma poison that could be used to 112 deprecate a macro - the code should just use LLONG_MAX and friends. 113 */ 114 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__) 115 116 #undef LONG_LONG_MIN 117 #undef LONG_LONG_MAX 118 #undef ULONG_LONG_MAX 119 120 #define LONG_LONG_MAX __LONG_LONG_MAX__ 121 #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL) 122 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 123 #endif 124 125 #endif /* __CLANG_LIMITS_H */ 126