1/*===---- limits.h - Standard header for integer sizes --------------------===*\
2 *
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
6 *
7\*===----------------------------------------------------------------------===*/
8
9#ifndef __CLANG_LIMITS_H
10#define __CLANG_LIMITS_H
11
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_
16#endif
17
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>
22#endif
23
24/* Many system headers try to "help us out" by defining these.  No really, we
25   know how big each datatype is. */
26#undef  SCHAR_MIN
27#undef  SCHAR_MAX
28#undef  UCHAR_MAX
29#undef  SHRT_MIN
30#undef  SHRT_MAX
31#undef  USHRT_MAX
32#undef  INT_MIN
33#undef  INT_MAX
34#undef  UINT_MAX
35#undef  LONG_MIN
36#undef  LONG_MAX
37#undef  ULONG_MAX
38
39#undef  CHAR_BIT
40#undef  CHAR_MIN
41#undef  CHAR_MAX
42
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__
48
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)
53
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)
58
59#ifndef MB_LEN_MAX
60#define MB_LEN_MAX 1
61#endif
62
63#define CHAR_BIT  __CHAR_BIT__
64
65#ifdef __CHAR_UNSIGNED__  /* -funsigned-char */
66#define CHAR_MIN 0
67#define CHAR_MAX UCHAR_MAX
68#else
69#define CHAR_MIN SCHAR_MIN
70#define CHAR_MAX __SCHAR_MAX__
71#endif
72
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>.
75 */
76#if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L
77
78#undef  LLONG_MIN
79#undef  LLONG_MAX
80#undef  ULLONG_MAX
81
82#define LLONG_MAX  __LONG_LONG_MAX__
83#define LLONG_MIN  (-__LONG_LONG_MAX__-1LL)
84#define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
85#endif
86
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.
90 */
91#if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
92
93#undef   LONG_LONG_MIN
94#undef   LONG_LONG_MAX
95#undef   ULONG_LONG_MAX
96
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)
100#endif
101
102#endif /* __CLANG_LIMITS_H */
103