70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/* Safe automatic memory allocation with out of memory checking.
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Copyright (C) 2003, 2005, 2007, 2009-2021 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 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 <https://www.gnu.org/licenses/>. */
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#ifndef _XMALLOCA_H
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#define _XMALLOCA_H
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#include "malloca.h"
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#include "xalloc.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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/* xmalloca(N) is a checking safe variant of alloca(N). It allocates N bytes
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of memory allocated on the stack, that must be freed using freea() before
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the function returns. N should not have side effects.
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Upon failure, it exits with an error message. */
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#if HAVE_ALLOCA
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# define xmalloca(N) \
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((N) < 4032 - (2 * sa_alignment_max - 1) \
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? (void *) (((uintptr_t) (char *) alloca ((N) + 2 * sa_alignment_max - 1) \
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+ (2 * sa_alignment_max - 1)) \
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& ~(uintptr_t)(2 * sa_alignment_max - 1)) \
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: xmmalloca (N))
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extern void * xmmalloca (size_t n);
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#else
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# define xmalloca(N) \
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xmalloc (N)
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#endif
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/* xnmalloca(N,S) is an overflow-safe variant of xmalloca (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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and S and N should not have side effects.
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The array must be freed using freea() before the function returns.
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Upon failure, it exits with an error message. */
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#if HAVE_ALLOCA
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/* Rely on xmalloca (SIZE_MAX) calling xalloc_die (). */
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# define xnmalloca(n, s) \
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xmalloca (xalloc_oversized (n, s) ? (size_t) (-1) : (n) * (size_t) (s))
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#else
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# define xnmalloca(n, s) \
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xnmalloc (n, s)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _XMALLOCA_H */
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