mirror of
https://github.com/videolan/vlc.git
synced 2024-11-23 18:03:48 +08:00
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
/*****************************************************************************
|
|
* posix_memalign.c: POSIX posix_memalign() replacement
|
|
*****************************************************************************
|
|
* Copyright © 2012, 2019 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 <errno.h>
|
|
#include <stdlib.h>
|
|
#include <limits.h>
|
|
|
|
#ifdef HAVE_MEMALIGN
|
|
# include <malloc.h>
|
|
#else
|
|
|
|
static void *memalign(size_t align, size_t size)
|
|
{
|
|
void *p = malloc(size);
|
|
|
|
if ((uintptr_t)p & (align - 1)) {
|
|
free(p);
|
|
p = NULL;
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int check_align(size_t align)
|
|
{
|
|
if (align & (align - 1)) /* must be a power of two */
|
|
return EINVAL;
|
|
if (align < sizeof (void *)) /* must be a multiple of sizeof (void *) */
|
|
return EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
int posix_memalign(void **ptr, size_t align, size_t size)
|
|
{
|
|
int val = check_align(align);
|
|
if (val)
|
|
return val;
|
|
|
|
/* Unlike posix_memalign(), legacy memalign() requires that size be a
|
|
* multiple of align.
|
|
*/
|
|
if (size > (SIZE_MAX / 2))
|
|
return ENOMEM;
|
|
|
|
size += (-size) & (align - 1);
|
|
|
|
int saved_errno = errno;
|
|
void *p = memalign(align, size);
|
|
if (p == NULL) {
|
|
val = errno;
|
|
errno = saved_errno;
|
|
return val;
|
|
}
|
|
|
|
*ptr = p;
|
|
return 0;
|
|
}
|