ulowell_clear
gp->g_iteclear = ulowell_clear;
ulowell_clear(ip, 0, 0, ip->rows, ip->cols);
ulowell_clear (ip, top, 0, bottom - top, ip->cols);
ulowell_clear(ip, bottom-lines+1, 0, lines-1, ip->cols);
ulowell_clear (ip, top, 0, bottom - top, ip->cols);
ulowell_clear(ip, top, 0, lines, ip->cols);
ulowell_clear (ip, sy, sx, 1, count);
ulowell_clear (ip, sy, ip->cols - count, 1, count);
void ulowell_clear(struct ite_softc *, int, int, int, int);