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/* util.c - memory functions.
*
* Copyright (c) 2020, Aleksey Kravchenko <rhash.admin@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "util.h"
#if defined(HAS_POSIX_ALIGNED_ALLOC)
#include <errno.h>
void* rhash_px_aalloc(size_t alignment, size_t size)
{
void* ptr;
if ((errno = posix_memalign(&ptr, alignment, size)) != 0)
return NULL;
return ptr;
}
#elif defined(HAS_GENERIC_ALIGNED_ALLOC)
#include <assert.h>
#include <stdlib.h>
void* rhash_aligned_alloc(size_t alignment, size_t size)
{
unsigned char* block = (unsigned char*)malloc(size + alignment);
assert((alignment & (alignment - 1)) == 0);
assert(alignment >= sizeof(void*));
if (block) {
const size_t alignment_mask = (alignment - 1);
unsigned char* basement = block + sizeof(void*);
size_t offset = ((unsigned char*)0 - basement) & alignment_mask;
void** result = (void**)(basement + offset);
assert((((unsigned char*)result - (unsigned char*)0) % alignment) == 0);
result[-1] = block; /* store original pointer */
return result;
}
return NULL;
}
void rhash_aligned_free(void* ptr)
{
void** pfree = (void**)ptr;
if (ptr)
free(pfree[-1]);
}
#else
typedef int dummy_declaration_required_by_strict_iso_c;
#endif /* HAS_POSIX_ALIGNED_ALLOC / HAS_GENERIC_ALIGNED_ALLOC */
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