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/*****************************************************************************
* aligned_alloc.c: C11 aligned_alloc() replacement
*****************************************************************************
* Copyright © 2012, 2017 Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
#if !defined (HAVE_POSIX_MEMALIGN)
# include <malloc.h>
#endif
void *aligned_alloc(size_t align, size_t size)
{
/* align must be a power of 2 */
/* size must be a multiple of align */
if ((align & (align - 1)) || (size & (align - 1)))
{
errno = EINVAL;
return NULL;
}
#ifdef HAVE_POSIX_MEMALIGN
if (align < sizeof (void *)) /* POSIX does not allow small alignment */
align = sizeof (void *);
void *ptr;
int err = posix_memalign(&ptr, align, size);
if (err)
{
errno = err;
ptr = NULL;
}
return ptr;
#elif defined(HAVE_MEMALIGN)
return memalign(align, size);
#elif defined (_WIN32) && defined(__MINGW32__)
return __mingw_aligned_malloc(size, align);
#elif defined (_WIN32) && defined(_MSC_VER)
return _aligned_malloc(size, align);
#else
#warning unsupported aligned allocation!
if (size > 0)
errno = ENOMEM;
return NULL;
#endif
}
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