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/* An aligned_alloc() function that works around platform bugs.
Copyright (C) 2020-2025 Free Software Foundation, Inc.
This file 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 file 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, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <stdlib.h>
#include <errno.h>
void *
aligned_alloc (size_t alignment, size_t size)
#undef aligned_alloc
{
if (alignment != 0 && (alignment & (alignment - 1)) == 0)
{
/* alignment is a power of 2. */
if (size == 0)
size = 1;
if (alignment >= sizeof (void *))
{
/* Make size a multiple of alignment. */
size = (size + (alignment - 1)) & -alignment;
if (size > 0)
return aligned_alloc (alignment, size);
else
{
errno = ENOMEM;
return NULL;
}
}
else
return malloc (size);
}
else
{
errno = EINVAL;
return NULL;
}
}
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