gnulib: upgrade to today's version
* tools/snippet/_Noreturn.h, tools/snippet/c++defs.h, tools/snippet/arg-nonnull.h, tools/snippet/warn-on-use.h: Rename to... * lib/_Noreturn.h, lib/c++defs.h, lib/arg-nonnull.h, lib/warn-on-use.h: ... these. * lib/filename.h, lib/getopt-cdefs.in.h, lib/getopt-core.h, lib/getopt-ext.h, lib/getopt-pfx-core.h, lib/getopt-pfx-ext.h, lib/localtime-buffer.c, lib/localtime-buffer.h, lib/malloca.c, lib/malloca.h, lib/malloca.valgrind, lib/stat-w32.c, lib/stat-w32.h, m4/eealloc.m4, m4/localtime-buffer.m4, m4/malloca.m4: New files. * lib/argp-help.c, lib/argp-parse.c, lib/error.c, lib/float.in.h, lib/getopt1.c, lib/getopt.c, lib/getopt.in.h, lib/getopt_int.h, lib/gettext.h, lib/gettimeofday.c, lib/intprops.h, lib/isatty.c, lib/limits.in.h, lib/localcharset.c, lib/Makefile.am, lib/mbrtowc.c, lib/mbsinit.c, lib/msvc-nothrow.c, lib/quotearg.c, lib/stat.c, lib/stdalign.in.h, lib/stdint.in.h, lib/string.in.h, lib/sys_stat.in.h, lib/sys_types.in.h, lib/tempname.c, lib/time.in.h, lib/unistd.in.h, lib/vasnprintf.c, lib/wchar.in.h, lib/wctype.in.h, lib/xalloc.h, lib/xalloc-oversized.h, m4/fcntl-o.m4, m4/float_h.m4, m4/getopt.m4, m4/gettimeofday.m4, m4/gnulib-common.m4, m4/gnulib-comp.m4, m4/include_next.m4, m4/largefile.m4, m4/lstat.m4, m4/mbrtowc.m4, m4/memchr.m4, m4/mkstemp.m4, m4/printf.m4, m4/sleep.m4, m4/stat.m4, m4/stdalign.m4, m4/stdint.m4, m4/strerror.m4, m4/string_h.m4, m4/sys_stat_h.m4, m4/sys_time_h.m4, m4/sys_types_h.m4, m4/time_h.m4, m4/unistd_h.m4, m4/wchar_h.m4, m4/wctype_h.m4, m4/wint_t.m4: Update.
This commit is contained in:
Alexandre Duret-Lutz
parent
aa8cf6ac92
commit
80d50c5665
81 changed files with 3458 additions and 1954 deletions
128
lib/malloca.h
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128
lib/malloca.h
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/* Safe automatic memory allocation.
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Copyright (C) 2003-2007, 2009-2017 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2003.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>. */
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#ifndef _MALLOCA_H
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#define _MALLOCA_H
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#include <alloca.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "xalloc-oversized.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* safe_alloca(N) is equivalent to alloca(N) when it is safe to call
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alloca(N); otherwise it returns NULL. It either returns N bytes of
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memory allocated on the stack, that lasts until the function returns,
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or NULL.
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Use of safe_alloca should be avoided:
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- inside arguments of function calls - undefined behaviour,
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- in inline functions - the allocation may actually last until the
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calling function returns.
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*/
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#if HAVE_ALLOCA
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/* The OS usually guarantees only one guard page at the bottom of the stack,
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and a page size can be as small as 4096 bytes. So we cannot safely
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allocate anything larger than 4096 bytes. Also care for the possibility
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of a few compiler-allocated temporary stack slots.
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This must be a macro, not a function. */
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# define safe_alloca(N) ((N) < 4032 ? alloca (N) : NULL)
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#else
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# define safe_alloca(N) ((void) (N), NULL)
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#endif
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/* malloca(N) is a safe variant of alloca(N). It allocates N bytes of
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memory allocated on the stack, that must be freed using freea() before
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the function returns. Upon failure, it returns NULL. */
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#if HAVE_ALLOCA
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# define malloca(N) \
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((N) < 4032 - sa_increment \
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? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \
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: mmalloca (N))
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#else
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# define malloca(N) \
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mmalloca (N)
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#endif
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extern void * mmalloca (size_t n);
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/* Free a block of memory allocated through malloca(). */
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#if HAVE_ALLOCA
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extern void freea (void *p);
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#else
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# define freea free
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#endif
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/* nmalloca(N,S) is an overflow-safe variant of malloca (N * S).
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It allocates an array of N objects, each with S bytes of memory,
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on the stack. S must be positive and N must be nonnegative.
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The array must be freed using freea() before the function returns. */
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#define nmalloca(n, s) (xalloc_oversized (n, s) ? NULL : malloca ((n) * (s)))
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#ifdef __cplusplus
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}
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#endif
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/* ------------------- Auxiliary, non-public definitions ------------------- */
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/* Determine the alignment of a type at compile time. */
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#if defined __GNUC__ || defined __IBM__ALIGNOF__
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# define sa_alignof __alignof__
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#elif defined __cplusplus
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template <class type> struct sa_alignof_helper { char __slot1; type __slot2; };
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# define sa_alignof(type) offsetof (sa_alignof_helper<type>, __slot2)
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#elif defined __hpux
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/* Work around a HP-UX 10.20 cc bug with enums constants defined as offsetof
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values. */
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# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8)
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#elif defined _AIX
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/* Work around an AIX 3.2.5 xlc bug with enums constants defined as offsetof
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values. */
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# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8)
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#else
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# define sa_alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
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#endif
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enum
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{
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/* The desired alignment of memory allocations is the maximum alignment
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among all elementary types. */
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sa_alignment_long = sa_alignof (long),
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sa_alignment_double = sa_alignof (double),
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#if HAVE_LONG_LONG_INT
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sa_alignment_longlong = sa_alignof (long long),
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#endif
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sa_alignment_longdouble = sa_alignof (long double),
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sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1)
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#if HAVE_LONG_LONG_INT
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| (sa_alignment_longlong - 1)
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#endif
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| (sa_alignment_longdouble - 1)
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) + 1,
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/* The increment that guarantees room for a magic word must be >= sizeof (int)
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and a multiple of sa_alignment_max. */
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sa_increment = ((sizeof (int) + sa_alignment_max - 1) / sa_alignment_max) * sa_alignment_max
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};
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#endif /* _MALLOCA_H */
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