EV_MAX
for (n = runcount; n < EV_MAX; n++) {
#define LastEV(sp) ((sp)->_mouse_events + EV_MAX - 1)
(long) (IndexEV(sp, eventp) + (EV_MAX - 1)) % EV_MAX
for (i = 0; i < EV_MAX; i++)
MEVENT _mouse_events[EV_MAX]; /* hold the last mouse event seen */