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#include <stdlib.h>
#include "meta.h"
size_t malloc_usable_size(void *p)
{
struct meta *g = get_meta(p);
int idx = get_slot_index(p);
size_t stride = get_stride(g);
unsigned char *start = g->mem->storage + stride*idx;
unsigned char *end = start + stride - IB;
return get_nominal_size(p, end);
}
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