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#include <malloc.h>
void *(*const __realloc_dep)(void *, size_t) = realloc;
struct chunk {
size_t psize, csize;
struct chunk *next, *prev;
};
#define OVERHEAD (2*sizeof(size_t))
#define CHUNK_SIZE(c) ((c)->csize & -2)
#define MEM_TO_CHUNK(p) (struct chunk *)((char *)(p) - OVERHEAD)
size_t malloc_usable_size(void *p)
{
return p ? CHUNK_SIZE(MEM_TO_CHUNK(p)) - OVERHEAD : 0;
}
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