malloc_usable_size.c raw

   1  #include <malloc.h>
   2  #include "malloc_impl.h"
   3   
   4  hidden void *(*const __realloc_dep)(void *, size_t) = realloc;
   5  
   6  size_t malloc_usable_size(void *p)
   7  {
   8  	return p ? CHUNK_SIZE(MEM_TO_CHUNK(p)) - OVERHEAD : 0;
   9  }
  10