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authorHolger Weiss <holger@zedat.fu-berlin.de>2013-08-19 21:27:12 (GMT)
committerHolger Weiss <holger@zedat.fu-berlin.de>2013-08-19 21:27:12 (GMT)
commit26fbe7f1e68bb0c96da32491efcf3696fe6c299b (patch)
treec4d95289187a64e9c7517bf73d8208026c3d2fb3 /gl/xalloc-oversized.h
parent5f79e3e9f62ca5487d9881973149136ba1d19d3e (diff)
downloadmonitoring-plugins-26fbe7f1e68bb0c96da32491efcf3696fe6c299b.tar.gz
Sync with the latest Gnulib code (6f2d632)
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1/* xalloc-oversized.h -- memory allocation size checking
2
3 Copyright (C) 1990-2000, 2003-2004, 2006-2013 Free Software Foundation, Inc.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18#ifndef XALLOC_OVERSIZED_H_
19# define XALLOC_OVERSIZED_H_
20
21# include <stddef.h>
22
23/* Return 1 if an array of N objects, each of size S, cannot exist due
24 to size arithmetic overflow. S must be positive and N must be
25 nonnegative. This is a macro, not a function, so that it
26 works correctly even when SIZE_MAX < N.
27
28 By gnulib convention, SIZE_MAX represents overflow in size
29 calculations, so the conservative dividend to use here is
30 SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
31 However, malloc (SIZE_MAX) fails on all known hosts where
32 sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
33 exactly-SIZE_MAX allocations on such hosts; this avoids a test and
34 branch when S is known to be 1. */
35# define xalloc_oversized(n, s) \
36 ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
37
38#endif /* !XALLOC_OVERSIZED_H_ */