Function calloc

test/libmm/memalloc.cpp:123–138

}

void *calloc(size_t num, size_t nsize)
{
	size_t size;
	void *block;
	if (!num || !nsize)
		return NULL;
	size = num * nsize;
	/* check mul overflow */
	if (nsize != size / num)
		return NULL;
	block = mymalloc(size);
	if (!block)
		return NULL;
	memset(block, 0, size);
	return block;
}

void *realloc(void *block, size_t size)
{