blob: cfd6e463ff924682d44346d130283094b7de3a07 [file] [log] [blame]
#include <stdlib.h>
#include <assert.h>
#include <inttypes.h>
#include "memalign.h"
struct align_footer {
unsigned int offset;
};
#define PTR_ALIGN(ptr, mask) \
(char *) (((uintptr_t) ((ptr) + (mask)) & ~(mask)))
void *fio_memalign(size_t alignment, size_t size)
{
struct align_footer *f;
void *ptr, *ret = NULL;
assert(!(alignment & (alignment - 1)));
ptr = malloc(size + alignment + size + sizeof(*f) - 1);
if (ptr) {
ret = PTR_ALIGN(ptr, alignment - 1);
f = ret + size;
f->offset = (uintptr_t) ret - (uintptr_t) ptr;
}
return ret;
}
void fio_memfree(void *ptr, size_t size)
{
struct align_footer *f = ptr + size;
free(ptr - f->offset);
}