GCC Middle and Back End API Reference
glimits.h
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1/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
2
3This file is part of GCC.
4
5GCC is free software; you can redistribute it and/or modify it under
6the terms of the GNU General Public License as published by the Free
7Software Foundation; either version 3, or (at your option) any later
8version.
9
10GCC is distributed in the hope that it will be useful, but WITHOUT ANY
11WARRANTY; without even the implied warranty of MERCHANTABILITY or
12FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13for more details.
14
15Under Section 7 of GPL version 3, you are granted additional
16permissions described in the GCC Runtime Library Exception, version
173.1, as published by the Free Software Foundation.
18
19You should have received a copy of the GNU General Public License and
20a copy of the GCC Runtime Library Exception along with this program;
21see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22<http://www.gnu.org/licenses/>. */
23
24#ifndef _LIMITS_H___
25#define _LIMITS_H___
26
27/* Number of bits in a `char'. */
28#undef CHAR_BIT
29#define CHAR_BIT __CHAR_BIT__
30
31/* Maximum length of a multibyte character. */
32#ifndef MB_LEN_MAX
33#define MB_LEN_MAX 1
34#endif
35
36/* Minimum and maximum values a `signed char' can hold. */
37#undef SCHAR_MIN
38#define SCHAR_MIN (-SCHAR_MAX - 1)
39#undef SCHAR_MAX
40#define SCHAR_MAX __SCHAR_MAX__
41
42/* Maximum value an `unsigned char' can hold. (Minimum is 0). */
43#undef UCHAR_MAX
44#if __SCHAR_MAX__ == __INT_MAX__
45# define UCHAR_MAX (SCHAR_MAX * 2U + 1U)
46#else
47# define UCHAR_MAX (SCHAR_MAX * 2 + 1)
48#endif
49
50/* Minimum and maximum values a `char' can hold. */
51#ifdef __CHAR_UNSIGNED__
52# undef CHAR_MIN
53# if __SCHAR_MAX__ == __INT_MAX__
54# define CHAR_MIN 0U
55# else
56# define CHAR_MIN 0
57# endif
58# undef CHAR_MAX
59# define CHAR_MAX UCHAR_MAX
60#else
61# undef CHAR_MIN
62# define CHAR_MIN SCHAR_MIN
63# undef CHAR_MAX
64# define CHAR_MAX SCHAR_MAX
65#endif
66
67/* Minimum and maximum values a `signed short int' can hold. */
68#undef SHRT_MIN
69#define SHRT_MIN (-SHRT_MAX - 1)
70#undef SHRT_MAX
71#define SHRT_MAX __SHRT_MAX__
72
73/* Maximum value an `unsigned short int' can hold. (Minimum is 0). */
74#undef USHRT_MAX
75#if __SHRT_MAX__ == __INT_MAX__
76# define USHRT_MAX (SHRT_MAX * 2U + 1U)
77#else
78# define USHRT_MAX (SHRT_MAX * 2 + 1)
79#endif
80
81/* Minimum and maximum values a `signed int' can hold. */
82#undef INT_MIN
83#define INT_MIN (-INT_MAX - 1)
84#undef INT_MAX
85#define INT_MAX __INT_MAX__
86
87/* Maximum value an `unsigned int' can hold. (Minimum is 0). */
88#undef UINT_MAX
89#define UINT_MAX (INT_MAX * 2U + 1U)
90
91/* Minimum and maximum values a `signed long int' can hold.
92 (Same as `int'). */
93#undef LONG_MIN
94#define LONG_MIN (-LONG_MAX - 1L)
95#undef LONG_MAX
96#define LONG_MAX __LONG_MAX__
97
98/* Maximum value an `unsigned long int' can hold. (Minimum is 0). */
99#undef ULONG_MAX
100#define ULONG_MAX (LONG_MAX * 2UL + 1UL)
101
102#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
103/* Minimum and maximum values a `signed long long int' can hold. */
104# undef LLONG_MIN
105# define LLONG_MIN (-LLONG_MAX - 1LL)
106# undef LLONG_MAX
107# define LLONG_MAX __LONG_LONG_MAX__
108
109/* Maximum value an `unsigned long long int' can hold. (Minimum is 0). */
110# undef ULLONG_MAX
111# define ULLONG_MAX (LLONG_MAX * 2ULL + 1ULL)
112#endif
113
114#if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined (__STRICT_ANSI__)
115/* Minimum and maximum values a `signed long long int' can hold. */
116# undef LONG_LONG_MIN
117# define LONG_LONG_MIN (-LONG_LONG_MAX - 1LL)
118# undef LONG_LONG_MAX
119# define LONG_LONG_MAX __LONG_LONG_MAX__
120
121/* Maximum value an `unsigned long long int' can hold. (Minimum is 0). */
122# undef ULONG_LONG_MAX
123# define ULONG_LONG_MAX (LONG_LONG_MAX * 2ULL + 1ULL)
124#endif
125
126#if (defined __STDC_WANT_IEC_60559_BFP_EXT__ \
127 || (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L))
128/* TS 18661-1 / C23 widths of integer types. */
129# undef CHAR_WIDTH
130# define CHAR_WIDTH __SCHAR_WIDTH__
131# undef SCHAR_WIDTH
132# define SCHAR_WIDTH __SCHAR_WIDTH__
133# undef UCHAR_WIDTH
134# define UCHAR_WIDTH __SCHAR_WIDTH__
135# undef SHRT_WIDTH
136# define SHRT_WIDTH __SHRT_WIDTH__
137# undef USHRT_WIDTH
138# define USHRT_WIDTH __SHRT_WIDTH__
139# undef INT_WIDTH
140# define INT_WIDTH __INT_WIDTH__
141# undef UINT_WIDTH
142# define UINT_WIDTH __INT_WIDTH__
143# undef LONG_WIDTH
144# define LONG_WIDTH __LONG_WIDTH__
145# undef ULONG_WIDTH
146# define ULONG_WIDTH __LONG_WIDTH__
147# undef LLONG_WIDTH
148# define LLONG_WIDTH __LONG_LONG_WIDTH__
149# undef ULLONG_WIDTH
150# define ULLONG_WIDTH __LONG_LONG_WIDTH__
151#endif
152
153#if defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L
154/* C23 width and limit of _Bool. */
155# undef BOOL_MAX
156# define BOOL_MAX 1
157# undef BOOL_WIDTH
158# define BOOL_WIDTH 1
159
160# ifdef __BITINT_MAXWIDTH__
161# undef BITINT_MAXWIDTH
162# define BITINT_MAXWIDTH __BITINT_MAXWIDTH__
163# endif
164
165# define __STDC_VERSION_LIMITS_H__ 202311L
166#endif
167
168#endif /* _LIMITS_H___ */