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glibc-2.40
include/limits.h
204 строки
6 KB
Joseph Myers
Refer to C23 in place of C2X in glibc
01 фев 2024, 14:02
01 фев 2024, 14:02
42cc619
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/* Copyright (C) 1991-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* * ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h> */ #ifndef _LIBC_LIMITS_H_ #define _LIBC_LIMITS_H_ 1 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION #include <bits/libc-header-start.h> /* Maximum length of any multibyte character in any locale. We define this value here since the gcc header does not define the correct value. */ #define MB_LEN_MAX 16 /* If we are not using GNU CC we have to define all the symbols ourself. Otherwise use gcc's definitions (see below). */ #if !defined __GNUC__ || __GNUC__ < 2 /* We only protect from multiple inclusion here, because all the other #include's protect themselves, and in GCC 2 we may #include_next through multiple copies of this file before we get to GCC's. */ # ifndef _LIMITS_H # define _LIMITS_H 1 #include <bits/wordsize.h> /* We don't have #include_next. Define ANSI <limits.h> for standard 32-bit words. */ /* These assume 8-bit `char's, 16-bit `short int's, and 32-bit `int's and `long int's. */ /* Number of bits in a `char'. */ # define CHAR_BIT 8 /* Minimum and maximum values a `signed char' can hold. */ # define SCHAR_MIN (-128) # define SCHAR_MAX 127 /* Maximum value an `unsigned char' can hold. (Minimum is 0.) */ # define UCHAR_MAX 255 /* Minimum and maximum values a `char' can hold. */ # ifdef __CHAR_UNSIGNED__ # define CHAR_MIN 0 # define CHAR_MAX UCHAR_MAX # else # define CHAR_MIN SCHAR_MIN # define CHAR_MAX SCHAR_MAX # endif /* Minimum and maximum values a `signed short int' can hold. */ # define SHRT_MIN (-32768) # define SHRT_MAX 32767 /* Maximum value an `unsigned short int' can hold. (Minimum is 0.) */ # define USHRT_MAX 65535 /* Minimum and maximum values a `signed int' can hold. */ # define INT_MIN (-INT_MAX - 1) # define INT_MAX 2147483647 /* Maximum value an `unsigned int' can hold. (Minimum is 0.) */ # define UINT_MAX 4294967295U /* Minimum and maximum values a `signed long int' can hold. */ # if __WORDSIZE == 64 # define LONG_MAX 9223372036854775807L # else # define LONG_MAX 2147483647L # endif # define LONG_MIN (-LONG_MAX - 1L) /* Maximum value an `unsigned long int' can hold. (Minimum is 0.) */ # if __WORDSIZE == 64 # define ULONG_MAX 18446744073709551615UL # else # define ULONG_MAX 4294967295UL # endif # ifdef __USE_ISOC99 /* Minimum and maximum values a `signed long long int' can hold. */ # define LLONG_MAX 9223372036854775807LL # define LLONG_MIN (-LLONG_MAX - 1LL) /* Maximum value an `unsigned long long int' can hold. (Minimum is 0.) */ # define ULLONG_MAX 18446744073709551615ULL # endif /* ISO C99 */ # endif /* limits.h */ #endif /* GCC 2. */ #endif /* !_LIBC_LIMITS_H_ */ /* Get the compiler's limits.h, which defines almost all the ISO constants. We put this #include_next outside the double inclusion check because it should be possible to include this file more than once and still get the definitions from gcc's header. */ #if defined __GNUC__ && !defined _GCC_LIMITS_H_ /* `_GCC_LIMITS_H_' is what GCC's file defines. */ # include_next <limits.h> #endif /* The <limits.h> files in some gcc versions don't define LLONG_MIN, LLONG_MAX, and ULLONG_MAX. Instead only the values gcc defined for ages are available. */ #if defined __USE_ISOC99 && defined __GNUC__ # ifndef LLONG_MIN # define LLONG_MIN (-LLONG_MAX-1) # endif # ifndef LLONG_MAX # define LLONG_MAX __LONG_LONG_MAX__ # endif # ifndef ULLONG_MAX # define ULLONG_MAX (LLONG_MAX * 2ULL + 1) # endif #endif /* The integer width macros are not defined by GCC's <limits.h> before GCC 7, or if _GNU_SOURCE rather than __STDC_WANT_IEC_60559_BFP_EXT__ is used to enable this feature. */ #if __GLIBC_USE (IEC_60559_BFP_EXT_C23) # ifndef CHAR_WIDTH # define CHAR_WIDTH 8 # endif # ifndef SCHAR_WIDTH # define SCHAR_WIDTH 8 # endif # ifndef UCHAR_WIDTH # define UCHAR_WIDTH 8 # endif # ifndef SHRT_WIDTH # define SHRT_WIDTH 16 # endif # ifndef USHRT_WIDTH # define USHRT_WIDTH 16 # endif # ifndef INT_WIDTH # define INT_WIDTH 32 # endif # ifndef UINT_WIDTH # define UINT_WIDTH 32 # endif # ifndef LONG_WIDTH # define LONG_WIDTH __WORDSIZE # endif # ifndef ULONG_WIDTH # define ULONG_WIDTH __WORDSIZE # endif # ifndef LLONG_WIDTH # define LLONG_WIDTH 64 # endif # ifndef ULLONG_WIDTH # define ULLONG_WIDTH 64 # endif #endif /* Use IEC_60559_BFP_EXT. */ /* The macros for _Bool are not defined by GCC's <limits.h> before GCC 11, or if _GNU_SOURCE is defined rather than enabling C23 support with -std. */ #if __GLIBC_USE (ISOC23) # ifndef BOOL_MAX # define BOOL_MAX 1 # endif # ifndef BOOL_WIDTH # define BOOL_WIDTH 1 # endif #endif #ifdef __USE_POSIX /* POSIX adds things to <limits.h>. */ # include <bits/posix1_lim.h> #endif #ifdef __USE_POSIX2 # include <bits/posix2_lim.h> #endif #ifdef __USE_XOPEN # include <bits/xopen_lim.h> #endif