Commit 0d12d16a authored by Paul Eggert's avatar Paul Eggert

limits-h: new module

This adds ISO/IEC TS 18661-1:2014 support to limits.h.
* MODULES.html.sh: Add limits-h,and move size_max to stdint section.
* doc/posix-headers/limits.texi: Document new module.
* lib/limits.in.h, m4/limits-h.m4, modules/limits-h:
* modules/limit-h-tests, tests/test-limits-h.c: New files.
parent 45080de2
2016-09-16 Paul Eggert <eggert@cs.ucla.edu>
limits-h: new module
This adds ISO/IEC TS 18661-1:2014 support to limits.h.
* MODULES.html.sh: Add limits-h,and move size_max to stdint section.
* doc/posix-headers/limits.texi: Document new module.
* lib/limits.in.h, m4/limits-h.m4, modules/limits-h:
* modules/limit-h-tests, tests/test-limits-h.c: New files.
stdio: don't redefine __USE_MINGW_ANSI_STDIO
* m4/stdio_h.m4 (gl_STDIO_H): Don't define __USE_MINGW_ANSI_STDIO
if it is already defined. Apparently GNU Emacs relies on this. See:
......@@ -2049,16 +2049,6 @@ func_all_modules ()
func_module vla
func_end_table
element="Sizes of integer types <limits.h>"
element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
func_section_wrap isoc_sup_limits
func_wrap H3
func_echo "$element"
func_begin_table
func_module size_max
func_end_table
element="Variable arguments <stdarg.h>"
element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
func_section_wrap isoc_sup_stdarg
......@@ -2096,6 +2086,7 @@ func_all_modules ()
func_echo "$element"
func_begin_table
func_module size_max
func_module stdint
func_end_table
......@@ -2354,6 +2345,15 @@ func_all_modules ()
func_module stdalign
func_end_table
element="Support for standard extensions to ISO C 11"
func_section_wrap c11_ext
func_wrap H2
func_echo "$element"
func_begin_table
func_module limits-h
func_end_table
element="Support for obsolete systems lacking POSIX:2008"
func_section_wrap posix_sup_obsolete
func_wrap H2
......
......@@ -11,6 +11,9 @@ Portability problems fixed by Gnulib:
The @code{HOST_NAME_MAX} macro is not defined on some platforms:
Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX 5.1, HP-UX 11,
IRIX 6.5, OSF/1 5.1, Solaris 11 2011-11, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.
@item
Macros like @code{CHAR_WIDTH} are not defined on some platforms:
glibc 2.24, many others.
@end itemize
Portability problems not fixed by Gnulib:
......
/* A GNU-like <limits.h>.
Copyright 2016 Free Software Foundation, Inc.
This program 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, or
(at your option) any later version.
This program 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 this program; if not, see <http://www.gnu.org/licenses/>. */
#ifndef _@GUARD_PREFIX@_LIMITS_H
#if __GNUC__ >= 3
@PRAGMA_SYSTEM_HEADER@
#endif
@PRAGMA_COLUMNS@
/* The include_next requires a split double-inclusion guard. */
#@INCLUDE_NEXT@ @NEXT_LIMITS_H@
#ifndef _@GUARD_PREFIX@_LIMITS_H
#define _@GUARD_PREFIX@_LIMITS_H
/* The number of usable bits in an unsigned or signed integer type
with minimum value MIN and maximum value MAX, as an int expression
suitable in #if. Cover all known practical hosts. This
implementation exploits the fact that MAX is 1 less than a power of
2, and merely counts the number of 1 bits in MAX; "COBn" means
"count the number of 1 bits in the low-order n bits"). */
#define _GL_INTEGER_WIDTH(min, max) (((min) < 0) + _GL_COB128 (max))
#define _GL_COB128(n) (_GL_COB64 ((n) >> 31 >> 31 >> 2) + _GL_COB64 (n))
#define _GL_COB64(n) (_GL_COB32 ((n) >> 31 >> 1) + _GL_COB32 (n))
#define _GL_COB32(n) (_GL_COB16 ((n) >> 16) + _GL_COB16 (n))
#define _GL_COB16(n) (_GL_COB8 ((n) >> 8) + _GL_COB8 (n))
#define _GL_COB8(n) (_GL_COB4 ((n) >> 4) + _GL_COB4 (n))
#define _GL_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + !!((n) & 1))
/* Macros specified by ISO/IEC TS 18661-1:2014. */
#if (! defined ULLONG_WIDTH \
&& (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__))
# define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX)
# define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX)
# define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX)
# define SHRT_WIDTH _GL_INTEGER_WIDTH (SHRT_MIN, SHRT_MAX)
# define USHRT_WIDTH _GL_INTEGER_WIDTH (0, USHRT_MAX)
# define INT_WIDTH _GL_INTEGER_WIDTH (INT_MIN, INT_MAX)
# define UINT_WIDTH _GL_INTEGER_WIDTH (0, UINT_MAX)
# define LONG_WIDTH _GL_INTEGER_WIDTH (LONG_MIN, LONG_MAX)
# define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX)
# define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX)
# define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX)
#endif /* !ULLONG_WIDTH && (_GNU_SOURCE || __STDC_WANT_IEC_60559_BFP_EXT__) */
#endif /* _@GUARD_PREFIX@_LIMITS_H */
#endif /* _@GUARD_PREFIX@_LIMITS_H */
dnl Check whether limits.h has needed features.
dnl Copyright 2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Paul Eggert.
AC_DEFUN_ONCE([gl_LIMITS_H],
[
gl_CHECK_NEXT_HEADERS([limits.h])
AC_CACHE_CHECK([whether limits.h has ULLONG_WIDTH etc.],
[gl_cv_header_limits_width],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#define __STDC_WANT_IEC_60559_BFP_EXT__ 1
#include <limits.h>
int ullw = ULLONG_WIDTH;]])],
[gl_cv_header_limits_width=yes],
[gl_cv_header_limits_width=no])])
if test "$gl_cv_header_limits_width" = yes; then
LIMITS_H=
else
LIMITS_H=limits.h
fi
AC_SUBST([LIMITS_H])
AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"])
])
Description:
A GNU-like <limits.h>.
Files:
lib/limits.in.h
m4/limits-h.m4
Depends-on:
include_next
configure.ac:
gl_LIMITS_H
Makefile.am:
BUILT_SOURCES += $(LIMITS_H)
# We need the following in order to create <limits.h> when the system
# doesn't have one that is compatible with GNU.
if GL_GENERATE_LIMITS_H
limits.h: limits.in.h $(top_builddir)/config.status
$(AM_V_GEN)rm -f $@-t $@ && \
{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
sed -e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \
-e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
-e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
-e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
-e 's|@''NEXT_LIMITS_H''@|$(NEXT_LIMITS_H)|g' \
< $(srcdir)/limits.in.h; \
} > $@-t && \
mv $@-t $@
else
limits.h: $(top_builddir)/config.status
rm -f $@
endif
MOSTLYCLEANFILES += limits.h limits.h-t
Include:
<limits.h>
License:
LGPLv2+
Maintainer:
all
Files:
tests/test-limits-h.c
Depends-on:
extensions
verify
configure.ac:
Makefile.am:
TESTS += test-limits-h
check_PROGRAMS += test-limits-h
/* Test of <limits.h> substitute.
Copyright 2016 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#include <config.h>
#include <limits.h>
#include "verify.h"
/* Macros specified by ISO/IEC TS 18661-1:2014. */
#define verify_width(width, min, max) \
verify ((max) >> ((width) - 1 - ((min) < 0)) == 1)
verify_width (CHAR_WIDTH, CHAR_MIN, CHAR_MAX);
verify_width (SCHAR_WIDTH, SCHAR_MIN, SCHAR_MAX);
verify_width (UCHAR_WIDTH, 0, UCHAR_MAX);
verify_width (SHRT_WIDTH, SHRT_MIN, SHRT_MAX);
verify_width (USHRT_WIDTH, 0, USHRT_MAX);
verify_width (INT_WIDTH, INT_MIN, INT_MAX);
verify_width (UINT_WIDTH, 0, UINT_MAX);
verify_width (LONG_WIDTH, LONG_MIN, LONG_MAX);
verify_width (ULONG_WIDTH, 0, ULONG_MAX);
verify_width (LLONG_WIDTH, LLONG_MIN, LLONG_MAX);
verify_width (ULLONG_WIDTH, 0, ULLONG_MAX);
int
main (void)
{
return 0;
}
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