68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
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/*****************************************************************************
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* aligned_alloc.c: C11 aligned_alloc() replacement
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*****************************************************************************
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* Copyright © 2012, 2017 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 <assert.h>
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#include <stdlib.h>
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#include <errno.h>
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#if !defined (HAVE_POSIX_MEMALIGN)
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# include <malloc.h>
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#endif
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void *aligned_alloc(size_t align, size_t size)
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{
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/* align must be a power of 2 */
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/* size must be a multiple of align */
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if ((align & (align - 1)) || (size & (align - 1)))
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{
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errno = EINVAL;
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return NULL;
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}
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#ifdef __ANDROID__
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if (align < sizeof (void *)) /* POSIX does not allow small alignment */
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align = sizeof (void *);
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void *ptr;
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int err = posix_memalign(&ptr, align, size);
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if (err)
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{
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errno = err;
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ptr = NULL;
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}
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return ptr;
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#elif defined(HAVE_MEMALIGN)
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return memalign(align, size);
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#elif defined (_WIN32) && defined(__MINGW32__)
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return __mingw_aligned_malloc(size, align);
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#elif defined (_WIN32) && defined(_MSC_VER)
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return _aligned_malloc(size, align);
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#else
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#warning unsupported aligned allocation!
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if (size > 0)
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errno = ENOMEM;
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return NULL;
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#endif
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}
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