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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 */ | |
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