35129e5a5a
* lib/argmatch.c, lib/argmatch.h, lib/c-ctype.c, lib/c-ctype.h, lib/config.charset, lib/c-strcasecmp.c, lib/c-strcaseeq.h, lib/c-strcase.h, lib/c-strncasecmp.c, lib/exitfail.c, lib/exitfail.h, lib/isatty.c, lib/localcharset.c, lib/localcharset.h, lib/mbrtowc.c, lib/mbsinit.c, lib/quotearg.c, lib/quotearg.h, lib/quote.h, lib/ref-add.sin, lib/ref-del.sin, lib/streq.h, lib/wctype-h.c, lib/wctype.in.h, lib/xalloc-die.c, lib/xalloc.h, lib/xalloc-oversized.h, lib/xmalloc.c, m4/codeset.m4, m4/configmake.m4, m4/glibc21.m4, m4/isatty.m4, m4/localcharset.m4, m4/locale-fr.m4, m4/locale-ja.m4, m4/locale-zh.m4, m4/mbrtowc.m4, m4/mbsinit.m4, m4/mbstate_t.m4, m4/quotearg.m4, m4/quote.m4, m4/wctype_h.m4, m4/xalloc.m4: New files. * lib/Makefile.am, m4/gnulib-cache.m4, m4/gnulib-comp.m4: Update.
38 lines
1.6 KiB
C
38 lines
1.6 KiB
C
/* xalloc-oversized.h -- memory allocation size checking
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Copyright (C) 1990-2000, 2003-2004, 2006-2013 Free Software Foundation, Inc.
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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 of the License, or
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(at your option) 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 XALLOC_OVERSIZED_H_
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# define XALLOC_OVERSIZED_H_
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# include <stddef.h>
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/* Return 1 if an array of N objects, each of size S, cannot exist due
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to size arithmetic overflow. S must be positive and N must be
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nonnegative. This is a macro, not a function, so that it
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works correctly even when SIZE_MAX < N.
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By gnulib convention, SIZE_MAX represents overflow in size
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calculations, so the conservative dividend to use here is
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SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
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However, malloc (SIZE_MAX) fails on all known hosts where
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sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
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exactly-SIZE_MAX allocations on such hosts; this avoids a test and
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branch when S is known to be 1. */
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# define xalloc_oversized(n, s) \
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((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
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#endif /* !XALLOC_OVERSIZED_H_ */
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