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cd80b6ab72
aligned_alloc() is not portably suitable for over-alignments.
posix_memalign()/memalign() are still needed.
This essentially reverts commit 34cd965645.
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*****************************************************************************
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* posix_memalign.c: POSIX posix_memalign() replacement
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*****************************************************************************
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* Copyright © 2012, 2019 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <limits.h>
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#ifdef HAVE_MEMALIGN
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# include <malloc.h>
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#else
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static void *memalign(size_t align, size_t size)
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{
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void *p = malloc(size);
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if ((uintptr_t)p & (align - 1)) {
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free(p);
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p = NULL;
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}
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return p;
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}
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#endif
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static int check_align(size_t align)
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{
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if (align & (align - 1)) /* must be a power of two */
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return EINVAL;
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if (align < sizeof (void *)) /* must be a multiple of sizeof (void *) */
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return EINVAL;
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return 0;
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}
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int posix_memalign(void **ptr, size_t align, size_t size)
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{
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int val = check_align(align);
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if (val)
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return val;
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/* Unlike posix_memalign(), legacy memalign() requires that size be a
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* multiple of align.
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*/
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if (size > (SIZE_MAX / 2))
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return ENOMEM;
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size += (-size) & (align - 1);
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int saved_errno = errno;
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void *p = memalign(align, size);
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if (p == NULL) {
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val = errno;
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errno = saved_errno;
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return val;
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}
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*ptr = p;
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return 0;
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}
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