Function st_mult

git-compat-util.h:645–651

#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))

static inline size_t st_mult(size_t a, size_t b)
{
	if (unsigned_mult_overflows(a, b))
		die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
		    (uintmax_t)a, (uintmax_t)b);
	return a * b;
}

static inline size_t st_sub(size_t a, size_t b)
{