4 size_t malloc_usable_size(void *p)
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);