clang API Documentation
00001 /*===---- limits.h - Standard header for integer sizes --------------------===*\ 00002 * 00003 * Copyright (c) 2009 Chris Lattner 00004 * 00005 * Permission is hereby granted, free of charge, to any person obtaining a copy 00006 * of this software and associated documentation files (the "Software"), to deal 00007 * in the Software without restriction, including without limitation the rights 00008 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00009 * copies of the Software, and to permit persons to whom the Software is 00010 * furnished to do so, subject to the following conditions: 00011 * 00012 * The above copyright notice and this permission notice shall be included in 00013 * all copies or substantial portions of the Software. 00014 * 00015 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00016 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00017 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00018 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00019 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00020 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00021 * THE SOFTWARE. 00022 * 00023 \*===----------------------------------------------------------------------===*/ 00024 00025 #ifndef __CLANG_LIMITS_H 00026 #define __CLANG_LIMITS_H 00027 00028 /* The system's limits.h may, in turn, try to #include_next GCC's limits.h. 00029 Avert this #include_next madness. */ 00030 #if defined __GNUC__ && !defined _GCC_LIMITS_H_ 00031 #define _GCC_LIMITS_H_ 00032 #endif 00033 00034 /* System headers include a number of constants from POSIX in <limits.h>. 00035 Include it if we're hosted. */ 00036 #if __STDC_HOSTED__ && \ 00037 defined(__has_include_next) && __has_include_next(<limits.h>) 00038 #include_next <limits.h> 00039 #endif 00040 00041 /* Many system headers try to "help us out" by defining these. No really, we 00042 know how big each datatype is. */ 00043 #undef SCHAR_MIN 00044 #undef SCHAR_MAX 00045 #undef UCHAR_MAX 00046 #undef SHRT_MIN 00047 #undef SHRT_MAX 00048 #undef USHRT_MAX 00049 #undef INT_MIN 00050 #undef INT_MAX 00051 #undef UINT_MAX 00052 #undef LONG_MIN 00053 #undef LONG_MAX 00054 #undef ULONG_MAX 00055 00056 #undef CHAR_BIT 00057 #undef CHAR_MIN 00058 #undef CHAR_MAX 00059 00060 /* C90/99 5.2.4.2.1 */ 00061 #define SCHAR_MAX __SCHAR_MAX__ 00062 #define SHRT_MAX __SHRT_MAX__ 00063 #define INT_MAX __INT_MAX__ 00064 #define LONG_MAX __LONG_MAX__ 00065 00066 #define SCHAR_MIN (-__SCHAR_MAX__-1) 00067 #define SHRT_MIN (-__SHRT_MAX__ -1) 00068 #define INT_MIN (-__INT_MAX__ -1) 00069 #define LONG_MIN (-__LONG_MAX__ -1L) 00070 00071 #define UCHAR_MAX (__SCHAR_MAX__*2 +1) 00072 #define USHRT_MAX (__SHRT_MAX__ *2 +1) 00073 #define UINT_MAX (__INT_MAX__ *2U +1U) 00074 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL) 00075 00076 #ifndef MB_LEN_MAX 00077 #define MB_LEN_MAX 1 00078 #endif 00079 00080 #define CHAR_BIT __CHAR_BIT__ 00081 00082 #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */ 00083 #define CHAR_MIN 0 00084 #define CHAR_MAX UCHAR_MAX 00085 #else 00086 #define CHAR_MIN SCHAR_MIN 00087 #define CHAR_MAX __SCHAR_MAX__ 00088 #endif 00089 00090 /* C99 5.2.4.2.1: Added long long. */ 00091 #if __STDC_VERSION__ >= 199901 00092 00093 #undef LLONG_MIN 00094 #undef LLONG_MAX 00095 #undef ULLONG_MAX 00096 00097 #define LLONG_MAX __LONG_LONG_MAX__ 00098 #define LLONG_MIN (-__LONG_LONG_MAX__-1LL) 00099 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 00100 #endif 00101 00102 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad 00103 that we don't have something like #pragma poison that could be used to 00104 deprecate a macro - the code should just use LLONG_MAX and friends. 00105 */ 00106 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__) 00107 00108 #undef LONG_LONG_MIN 00109 #undef LONG_LONG_MAX 00110 #undef ULONG_LONG_MAX 00111 00112 #define LONG_LONG_MAX __LONG_LONG_MAX__ 00113 #define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL) 00114 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL) 00115 #endif 00116 00117 #endif /* __CLANG_LIMITS_H */