| Logan Chien | 2833ffb | 2018-10-09 10:03:24 +0800 | [diff] [blame] | 1 | /*===---- limits.h - Standard header for integer sizes --------------------===*\ |
| 2 | * |
| Logan Chien | df4f766 | 2019-09-04 16:45:23 -0700 | [diff] [blame] | 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 |
| Logan Chien | 2833ffb | 2018-10-09 10:03:24 +0800 | [diff] [blame] | 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 */ |