1#include <stdlib.h>
 2#include "meta.h"
 3
 4size_t malloc_usable_size(void *p)
 5{
 6	if (!p) return 0;
 7	struct meta *g = get_meta(p);
 8	int idx = get_slot_index(p);
 9	size_t stride = get_stride(g);
10	unsigned char *start = g->mem->storage + stride*idx;
11	unsigned char *end = start + stride - IB;
12	return get_nominal_size(p, end);
13}