1 /*===---- limits.h - Standard header for integer sizes --------------------===*\
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
7 \*===----------------------------------------------------------------------===*/
9 #ifndef __CLANG_LIMITS_H
10 #define __CLANG_LIMITS_H
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_
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>
24 /* Many system headers try to "help us out" by defining these. No really, we
25 know how big each datatype is. */
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__
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)
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)
63 #define CHAR_BIT __CHAR_BIT__
65 #ifdef __CHAR_UNSIGNED__ /* -funsigned-char */
67 #define CHAR_MAX UCHAR_MAX
69 #define CHAR_MIN SCHAR_MIN
70 #define CHAR_MAX __SCHAR_MAX__
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>.
76 #if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L
82 #define LLONG_MAX __LONG_LONG_MAX__
83 #define LLONG_MIN (-__LONG_LONG_MAX__-1LL)
84 #define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
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.
91 #if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
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)
102 #endif /* __CLANG_LIMITS_H */