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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 #undef  WCHAR_MIN
56 #undef  WCHAR_MAX
57 
58 #undef  CHAR_BIT
59 #undef  CHAR_MIN
60 #undef  CHAR_MAX
61 
62 /* C90/99 5.2.4.2.1 */
63 #define SCHAR_MAX __SCHAR_MAX__
64 #define SHRT_MAX  __SHRT_MAX__
65 #define INT_MAX   __INT_MAX__
66 #define LONG_MAX  __LONG_MAX__
67 #define WCHAR_MAX __WCHAR_MAX__
68 
69 #define SCHAR_MIN (-__SCHAR_MAX__-1)
70 #define SHRT_MIN  (-__SHRT_MAX__ -1)
71 #define INT_MIN   (-__INT_MAX__  -1)
72 #define LONG_MIN  (-__LONG_MAX__ -1L)
73 
74 #define UCHAR_MAX (__SCHAR_MAX__*2  +1)
75 #define USHRT_MAX (__SHRT_MAX__ *2  +1)
76 #define UINT_MAX  (__INT_MAX__  *2U +1U)
77 #define ULONG_MAX (__LONG_MAX__ *2UL+1UL)
78 
79 #ifndef MB_LEN_MAX
80 #define MB_LEN_MAX 1
81 #endif
82 
83 #define CHAR_BIT  __CHAR_BIT__
84 
85 #ifdef __CHAR_UNSIGNED__  /* -funsigned-char */
86 #define CHAR_MIN 0
87 #define CHAR_MAX UCHAR_MAX
88 #else
89 #define CHAR_MIN SCHAR_MIN
90 #define CHAR_MAX __SCHAR_MAX__
91 #endif
92 
93 /* C++ or C99: Added wchar_t */
94 #if defined(__cplusplus) || __STDC_VERSION__ >= 199901
95 
96 #ifdef __WCHAR_UNSIGNED__
97 #define WCHAR_MIN 0
98 #else
99 #define WCHAR_MIN (-__WCHAR_MAX__-1)
100 #endif
101 
102 #endif
103 
104 /* C99 5.2.4.2.1: Added long long. */
105 #if __STDC_VERSION__ >= 199901
106 
107 #undef  LLONG_MIN
108 #undef  LLONG_MAX
109 #undef  ULLONG_MAX
110 
111 #define LLONG_MAX  __LONG_LONG_MAX__
112 #define LLONG_MIN  (-__LONG_LONG_MAX__-1LL)
113 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
114 #endif
115 
116 /* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension.  It's too bad
117    that we don't have something like #pragma poison that could be used to
118    deprecate a macro - the code should just use LLONG_MAX and friends.
119  */
120 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
121 
122 #undef   LONG_LONG_MIN
123 #undef   LONG_LONG_MAX
124 #undef   ULONG_LONG_MAX
125 
126 #define LONG_LONG_MAX  __LONG_LONG_MAX__
127 #define LONG_LONG_MIN  (-__LONG_LONG_MAX__-1LL)
128 #define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
129 #endif
130 
131 #endif /* __CLANG_LIMITS_H */
132