File: malloc_usable.c

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#include <assert.h>
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>

int main(void)
{
   // Since our allocations are in multiples of 8, 99 will round up to 104.
   int* x = malloc(99);
#  if !defined(_AIX)
   assert(104 == malloc_usable_size(x));
#  endif
   return 0;
}