test5/f.c

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

size_t malloc_counter;
size_t free_counter;

void * TEST_MALLOC(size_t size)
{
	printf("malloc'ed %lu\n", size);

	malloc_counter += size;
	return malloc(size);
}

void TEST_FREE(void *p)
{
	size_t s = malloc_usable_size(p);
	printf("freed %lu\n", s);

	free_counter += s;

	free(p);
}

#define malloc TEST_MALLOC
#define free   TEST_FREE
int f(void)
{
	free(malloc(16));
	free(malloc(32));
	free(malloc(48));
	free(malloc(64));
	free(malloc(96));
	free(malloc(128));
	malloc(256);

	return 1;
}
#undef malloc
#undef free

int main(void)
{
	malloc_counter = free_counter = 0;
	(void) f();

	printf("malloc: %lu, free: %lu\n", malloc_counter, free_counter);
	
	return malloc_counter != free_counter;
}