1#include <malloc.h>
2#include "malloc_impl.h"
3 
4hidden void *(*const __realloc_dep)(void *, size_t) = realloc;
5
6size_t malloc_usable_size(void *p)
7{
8	return p ? CHUNK_SIZE(MEM_TO_CHUNK(p)) - OVERHEAD : 0;
9}