}
long
-time_compare(struct timeval *a, struct timeval *b)
+time_compare(const struct timeval *a, const struct timeval *b)
{
long r;
if ((r = a->tv_sec - b->tv_sec)) return r;
}
void
-time_difference(struct timeval *a, struct timeval *b, struct timeval *r)
+time_difference(const struct timeval *a, const struct timeval *b,
+ struct timeval *r)
{
struct timeval v;
v.tv_sec = a->tv_sec - b->tv_sec;