execute, spawn-pipe: Make multithread-safe on native Windows.
[gnulib.git] / lib / xmalloca.h
blobc9f6564442a990d1246138aad7add10d5bdc188d
1 /* Safe automatic memory allocation with out of memory checking.
2 Copyright (C) 2003, 2005, 2007, 2009-2020 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2003.
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.
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.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 #ifndef _XMALLOCA_H
19 #define _XMALLOCA_H
21 #include "malloca.h"
22 #include "xalloc.h"
25 #ifdef __cplusplus
26 extern "C" {
27 #endif
30 /* xmalloca(N) is a checking safe variant of alloca(N). It allocates N bytes
31 of memory allocated on the stack, that must be freed using freea() before
32 the function returns. Upon failure, it exits with an error message. */
33 #if HAVE_ALLOCA
34 # define xmalloca(N) \
35 ((N) < 4032 - (2 * sa_alignment_max - 1) \
36 ? (void *) (((uintptr_t) (char *) alloca ((N) + 2 * sa_alignment_max - 1) \
37 + (2 * sa_alignment_max - 1)) \
38 & ~(uintptr_t)(2 * sa_alignment_max - 1)) \
39 : xmmalloca (N))
40 extern void * xmmalloca (size_t n);
41 #else
42 # define xmalloca(N) \
43 xmalloc (N)
44 #endif
46 /* xnmalloca(N,S) is an overflow-safe variant of xmalloca (N * S).
47 It allocates an array of N objects, each with S bytes of memory,
48 on the stack. S must be positive and N must be nonnegative.
49 The array must be freed using freea() before the function returns.
50 Upon failure, it exits with an error message. */
51 #if HAVE_ALLOCA
52 /* Rely on xmalloca (SIZE_MAX) calling xalloc_die (). */
53 # define xnmalloca(n, s) \
54 xmalloca (xalloc_oversized ((n), (s)) ? (size_t) (-1) : (n) * (s))
55 #else
56 # define xnmalloca(n, s) \
57 xnmalloc ((n), (s))
58 #endif
61 #ifdef __cplusplus
63 #endif
66 #endif /* _XMALLOCA_H */