1 /*===---- limits.h - Standard header for integer sizes --------------------===*\ 2 * 3 * Copyright (c) 2009 Chris Lattner 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a copy 6 * of this software and associated documentation files (the "Software"), to deal 7 * in the Software without restriction, including without limitation the rights 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 * copies of the Software, and to permit persons to whom the Software is 10 * furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 * THE SOFTWARE. 22 * 23 \*===----------------------------------------------------------------------===*/ 24 25 #ifndef __CLANG_LIMITS_H 26 #define __CLANG_LIMITS_H 27 28 /* The system's limits.h may, in turn, try to #include_next GCC's limits.h. 29 Avert this #include_next madness. */ 30 #if defined __GNUC__ && !defined _GCC_LIMITS_H_ 31 #define _GCC_LIMITS_H_ 32 #endif 33 34 /* System headers include a number of constants from POSIX in <limits.h>. 35 Include it if we're hosted. */ 36 #if __STDC_HOSTED__ && \ 37 defined(__has_include_next) && __has_include_next(<limits.h>) 38 #include_next <limits.h> 39 #endif 40 41 /* Many system headers try to "help us out" by defining these. No really, we 42 know how big each datatype is. */ 43 #undef SCHAR_MIN 44 #undef SCHAR_MAX 45 #undef UCHAR_MAX 46 #undef SHRT_MIN 47 #undef SHRT_MAX 48 #undef USHRT_MAX 49 #undef INT_MIN 50 #undef INT_MAX 51 #undef UINT_MAX 52 #undef LONG_MIN 53 #undef LONG_MAX 54 #undef ULONG_MAX 55 56 #undef CHAR_BIT 57 #undef CHAR_MIN 58 #undef CHAR_MAX 59 60 /* C90/99 5.2.4.2.1 */ 61 #define SCHAR_MAX __SCHAR_MAX__ 62 #define SHRT_MAX __SHRT_MAX__ 63 #define INT_MAX __INT_MAX__ 64 #define LONG_MAX __LONG_MAX__ 65 66 #define SCHAR_MIN (-__SCHAR_MAX__-1) 67 #define SHRT_MIN (-__SHRT_MAX__ -1) 68 #define INT_MIN (-__INT_MAX__ -1) 69 #define LONG_MIN (-__LONG_MAX__ -1L) 70 71 #define UCHAR_MAX (__SCHAR_MAX__*2 +1) 72 #define USHRT_MAX (__SHRT_MAX__ *2 +1) 73 #define UINT_MAX (__INT_MAX__ *2U +1U) 74 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL) 75 76 #ifndef MB_LEN_MAX 77 #define MB_LEN_MAX 1 78 #endif 79 80 #define CHAR_BIT __CHAR_BIT__ 81 82 #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */ 83 #define CHAR_MIN 0 84 #define CHAR_MAX UCHAR_MAX 85 #else 86 #define CHAR_MIN SCHAR_MIN 87 #define CHAR_MAX __SCHAR_MAX__ 88 #endif 89 90 /* C99 5.2.4.2.1: Added long long. */ 91 #if __STDC_VERSION__ >= 199901 92 93 #undef LLONG_MIN 94 #undef LLONG_MAX 95 #undef ULLONG_MAX 96 97 #define LLONG_MAX __LONG_LONG_MAX__ 98 #define LLONG_MIN (-__LONG_LONG_MAX__-1LL) 99 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 100 #endif 101 102 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad 103 that we don't have something like #pragma poison that could be used to 104 deprecate a macro - the code should just use LLONG_MAX and friends. 105 */ 106 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__) 107 108 #undef LONG_LONG_MIN 109 #undef LONG_LONG_MAX 110 #undef ULONG_LONG_MAX 111 112 #define LONG_LONG_MAX __LONG_LONG_MAX__ 113 #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL) 114 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 115 #endif 116 117 #endif /* __CLANG_LIMITS_H */ 118