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a292f45acd
TS 18661-1 defines macros for the width of integer types, intended for use with the fromfp functions to convert from floating-point types to integer types of any width, in any rounding mode and with control over whether "inexact" is raised. Such macros are, of course, more generally useful than just with those functions. Those macros are added to <limits.h> and <stdint.h>. This patch adds the <limits.h> macros to glibc's header, with the <stdint.h> ones intended to be added in a separate patch (which would add to the NEWS entry created by this patch). I've also added these macros to GCC's headers for GCC 7, but definitions in glibc's <limits.h> are still useful for older GCC, for non-GNU compilers and for when it's _GNU_SOURCE rather than __STDC_WANT_IEC_60559_BFP_EXT__ that implies the macros should be defined since the GCC header only considers __STDC_WANT_IEC_60559_BFP_EXT__ (and for glibc systems, the definitions in GCC's <stdint.h> will only be used with -ffreestanding). Tested for x86_64 and x86. * include/limits.h: Define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include <bits/libc-header-start.h> instead of including <features.h>. [__GLIBC_USE (IEC_60559_BFP_EXT)] (CHAR_WIDTH): New macro. [__GLIBC_USE (IEC_60559_BFP_EXT)] (SCHAR_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (UCHAR_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (SHRT_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (USHRT_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (LONG_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (ULONG_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (LLONG_WIDTH): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (ULLONG_WIDTH): Likewise. * manual/lang.texi (Width of Type): Document these macros. * stdlib/tst-width.c: New file. * stdlib/Makefile (tests): Add tst-width.
202 lines
5.4 KiB
C
202 lines
5.4 KiB
C
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* ISO C99 Standard: 7.10/5.2.4.2.1 Sizes of integer types <limits.h>
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*/
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#ifndef _LIBC_LIMITS_H_
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#define _LIBC_LIMITS_H_ 1
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#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
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#include <bits/libc-header-start.h>
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/* Maximum length of any multibyte character in any locale.
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We define this value here since the gcc header does not define
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the correct value. */
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#define MB_LEN_MAX 16
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/* If we are not using GNU CC we have to define all the symbols ourself.
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Otherwise use gcc's definitions (see below). */
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#if !defined __GNUC__ || __GNUC__ < 2
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/* We only protect from multiple inclusion here, because all the other
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#include's protect themselves, and in GCC 2 we may #include_next through
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multiple copies of this file before we get to GCC's. */
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# ifndef _LIMITS_H
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# define _LIMITS_H 1
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#include <bits/wordsize.h>
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/* We don't have #include_next.
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Define ANSI <limits.h> for standard 32-bit words. */
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/* These assume 8-bit `char's, 16-bit `short int's,
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and 32-bit `int's and `long int's. */
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/* Number of bits in a `char'. */
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# define CHAR_BIT 8
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/* Minimum and maximum values a `signed char' can hold. */
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# define SCHAR_MIN (-128)
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# define SCHAR_MAX 127
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/* Maximum value an `unsigned char' can hold. (Minimum is 0.) */
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# define UCHAR_MAX 255
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/* Minimum and maximum values a `char' can hold. */
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# ifdef __CHAR_UNSIGNED__
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# define CHAR_MIN 0
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# define CHAR_MAX UCHAR_MAX
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# else
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# define CHAR_MIN SCHAR_MIN
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# define CHAR_MAX SCHAR_MAX
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# endif
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/* Minimum and maximum values a `signed short int' can hold. */
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# define SHRT_MIN (-32768)
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# define SHRT_MAX 32767
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/* Maximum value an `unsigned short int' can hold. (Minimum is 0.) */
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# define USHRT_MAX 65535
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/* Minimum and maximum values a `signed int' can hold. */
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# define INT_MIN (-INT_MAX - 1)
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# define INT_MAX 2147483647
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/* Maximum value an `unsigned int' can hold. (Minimum is 0.) */
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# define UINT_MAX 4294967295U
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/* Minimum and maximum values a `signed long int' can hold. */
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# if __WORDSIZE == 64
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# define LONG_MAX 9223372036854775807L
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# else
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# define LONG_MAX 2147483647L
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# endif
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# define LONG_MIN (-LONG_MAX - 1L)
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/* Maximum value an `unsigned long int' can hold. (Minimum is 0.) */
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# if __WORDSIZE == 64
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# define ULONG_MAX 18446744073709551615UL
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# else
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# define ULONG_MAX 4294967295UL
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# endif
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# ifdef __USE_ISOC99
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/* Minimum and maximum values a `signed long long int' can hold. */
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# define LLONG_MAX 9223372036854775807LL
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# define LLONG_MIN (-LLONG_MAX - 1LL)
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/* Maximum value an `unsigned long long int' can hold. (Minimum is 0.) */
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# define ULLONG_MAX 18446744073709551615ULL
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# endif /* ISO C99 */
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# endif /* limits.h */
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#endif /* GCC 2. */
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#endif /* !_LIBC_LIMITS_H_ */
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/* Get the compiler's limits.h, which defines almost all the ISO constants.
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We put this #include_next outside the double inclusion check because
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it should be possible to include this file more than once and still get
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the definitions from gcc's header. */
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#if defined __GNUC__ && !defined _GCC_LIMITS_H_
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/* `_GCC_LIMITS_H_' is what GCC's file defines. */
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# include_next <limits.h>
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#endif
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/* The <limits.h> files in some gcc versions don't define LLONG_MIN,
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LLONG_MAX, and ULLONG_MAX. Instead only the values gcc defined for
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ages are available. */
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#if defined __USE_ISOC99 && defined __GNUC__
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# ifndef LLONG_MIN
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# define LLONG_MIN (-LLONG_MAX-1)
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# endif
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# ifndef LLONG_MAX
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# define LLONG_MAX __LONG_LONG_MAX__
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# endif
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# ifndef ULLONG_MAX
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# define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
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# endif
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#endif
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/* The integer width macros are not defined by GCC's <limits.h> before
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GCC 7, or if _GNU_SOURCE rather than
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__STDC_WANT_IEC_60559_BFP_EXT__ is used to enable this feature. */
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#if __GLIBC_USE (IEC_60559_BFP_EXT)
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# ifndef CHAR_WIDTH
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# define CHAR_WIDTH 8
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# endif
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# ifndef SCHAR_WIDTH
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# define SCHAR_WIDTH 8
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# endif
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# ifndef UCHAR_WIDTH
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# define UCHAR_WIDTH 8
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# endif
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# ifndef SHRT_WIDTH
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# define SHRT_WIDTH 16
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# endif
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# ifndef USHRT_WIDTH
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# define USHRT_WIDTH 16
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# endif
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# ifndef INT_WIDTH
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# define INT_WIDTH 32
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# endif
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# ifndef UINT_WIDTH
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# define UINT_WIDTH 32
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# endif
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# if LONG_MAX == 0x7fffffffL
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# ifndef LONG_WIDTH
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# define LONG_WIDTH 32
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# endif
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# ifndef ULONG_WIDTH
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# define ULONG_WIDTH 32
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# endif
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# else
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# ifndef LONG_WIDTH
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# define LONG_WIDTH 64
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# endif
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# ifndef ULONG_WIDTH
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# define ULONG_WIDTH 64
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# endif
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# endif
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# ifndef LLONG_WIDTH
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# define LLONG_WIDTH 64
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# endif
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# ifndef ULLONG_WIDTH
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# define ULLONG_WIDTH 64
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# endif
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#endif /* Use IEC_60559_BFP_EXT. */
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#ifdef __USE_POSIX
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/* POSIX adds things to <limits.h>. */
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# include <bits/posix1_lim.h>
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#endif
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#ifdef __USE_POSIX2
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# include <bits/posix2_lim.h>
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#endif
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#ifdef __USE_XOPEN
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# include <bits/xopen_lim.h>
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#endif
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