1/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18/*
19 * ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h>
20 */
21
22#ifndef _LIBC_LIMITS_H_
23#define _LIBC_LIMITS_H_ 1
24
25#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
26#include <bits/libc-header-start.h>
27
28
29/* Maximum length of any multibyte character in any locale.
30 We define this value here since the gcc header does not define
31 the correct value. */
32#define MB_LEN_MAX 16
33
34
35/* If we are not using GNU CC we have to define all the symbols ourself.
36 Otherwise use gcc's definitions (see below). */
37#if !defined __GNUC__ || __GNUC__ < 2
38
39/* We only protect from multiple inclusion here, because all the other
40 #include's protect themselves, and in GCC 2 we may #include_next through
41 multiple copies of this file before we get to GCC's. */
42# ifndef _LIMITS_H
43# define _LIMITS_H 1
44
45#include <bits/wordsize.h>
46
47/* We don't have #include_next.
48 Define ANSI <limits.h> for standard 32-bit words. */
49
50/* These assume 8-bit `char's, 16-bit `short int's,
51 and 32-bit `int's and `long int's. */
52
53/* Number of bits in a `char'. */
54# define CHAR_BIT 8
55
56/* Minimum and maximum values a `signed char' can hold. */
57# define SCHAR_MIN (-128)
58# define SCHAR_MAX 127
59
60/* Maximum value an `unsigned char' can hold. (Minimum is 0.) */
61# define UCHAR_MAX 255
62
63/* Minimum and maximum values a `char' can hold. */
64# ifdef __CHAR_UNSIGNED__
65# define CHAR_MIN 0
66# define CHAR_MAX UCHAR_MAX
67# else
68# define CHAR_MIN SCHAR_MIN
69# define CHAR_MAX SCHAR_MAX
70# endif
71
72/* Minimum and maximum values a `signed short int' can hold. */
73# define SHRT_MIN (-32768)
74# define SHRT_MAX 32767
75
76/* Maximum value an `unsigned short int' can hold. (Minimum is 0.) */
77# define USHRT_MAX 65535
78
79/* Minimum and maximum values a `signed int' can hold. */
80# define INT_MIN (-INT_MAX - 1)
81# define INT_MAX 2147483647
82
83/* Maximum value an `unsigned int' can hold. (Minimum is 0.) */
84# define UINT_MAX 4294967295U
85
86/* Minimum and maximum values a `signed long int' can hold. */
87# if __WORDSIZE == 64
88# define LONG_MAX 9223372036854775807L
89# else
90# define LONG_MAX 2147483647L
91# endif
92# define LONG_MIN (-LONG_MAX - 1L)
93
94/* Maximum value an `unsigned long int' can hold. (Minimum is 0.) */
95# if __WORDSIZE == 64
96# define ULONG_MAX 18446744073709551615UL
97# else
98# define ULONG_MAX 4294967295UL
99# endif
100
101# ifdef __USE_ISOC99
102
103/* Minimum and maximum values a `signed long long int' can hold. */
104# define LLONG_MAX 9223372036854775807LL
105# define LLONG_MIN (-LLONG_MAX - 1LL)
106
107/* Maximum value an `unsigned long long int' can hold. (Minimum is 0.) */
108# define ULLONG_MAX 18446744073709551615ULL
109
110# endif /* ISO C99 */
111
112# endif /* limits.h */
113#endif /* GCC 2. */
114
115#endif /* !_LIBC_LIMITS_H_ */
116
117 /* Get the compiler's limits.h, which defines almost all the ISO constants.
118
119 We put this #include_next outside the double inclusion check because
120 it should be possible to include this file more than once and still get
121 the definitions from gcc's header. */
122#if defined __GNUC__ && !defined _GCC_LIMITS_H_
123/* `_GCC_LIMITS_H_' is what GCC's file defines. */
124# include_next <limits.h>
125#endif
126
127/* The <limits.h> files in some gcc versions don't define LLONG_MIN,
128 LLONG_MAX, and ULLONG_MAX. Instead only the values gcc defined for
129 ages are available. */
130#if defined __USE_ISOC99 && defined __GNUC__
131# ifndef LLONG_MIN
132# define LLONG_MIN (-LLONG_MAX-1)
133# endif
134# ifndef LLONG_MAX
135# define LLONG_MAX __LONG_LONG_MAX__
136# endif
137# ifndef ULLONG_MAX
138# define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
139# endif
140#endif
141
142/* The integer width macros are not defined by GCC's <limits.h> before
143 GCC 7, or if _GNU_SOURCE rather than
144 __STDC_WANT_IEC_60559_BFP_EXT__ is used to enable this feature. */
145#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
146# ifndef CHAR_WIDTH
147# define CHAR_WIDTH 8
148# endif
149# ifndef SCHAR_WIDTH
150# define SCHAR_WIDTH 8
151# endif
152# ifndef UCHAR_WIDTH
153# define UCHAR_WIDTH 8
154# endif
155# ifndef SHRT_WIDTH
156# define SHRT_WIDTH 16
157# endif
158# ifndef USHRT_WIDTH
159# define USHRT_WIDTH 16
160# endif
161# ifndef INT_WIDTH
162# define INT_WIDTH 32
163# endif
164# ifndef UINT_WIDTH
165# define UINT_WIDTH 32
166# endif
167# ifndef LONG_WIDTH
168# define LONG_WIDTH __WORDSIZE
169# endif
170# ifndef ULONG_WIDTH
171# define ULONG_WIDTH __WORDSIZE
172# endif
173# ifndef LLONG_WIDTH
174# define LLONG_WIDTH 64
175# endif
176# ifndef ULLONG_WIDTH
177# define ULLONG_WIDTH 64
178# endif
179#endif /* Use IEC_60559_BFP_EXT. */
180
181/* The macros for _Bool are not defined by GCC's <limits.h> before GCC
182 11, or if _GNU_SOURCE is defined rather than enabling C2x support
183 with -std. */
184#if __GLIBC_USE (ISOC2X)
185# ifndef BOOL_MAX
186# define BOOL_MAX 1
187# endif
188# ifndef BOOL_WIDTH
189# define BOOL_WIDTH 1
190# endif
191#endif
192
193#ifdef __USE_POSIX
194/* POSIX adds things to <limits.h>. */
195# include <bits/posix1_lim.h>
196#endif
197
198#ifdef __USE_POSIX2
199# include <bits/posix2_lim.h>
200#endif
201
202#ifdef __USE_XOPEN
203# include <bits/xopen_lim.h>
204#endif
205

source code of include/limits.h