rasops_cursor
int rasops_cursor(void *, int, int, int);
rasops_cursor(ri, 0, 0, 0);
rasops_cursor(ri, 1, scr->rs_crow, scr->rs_ccol);
return rasops_cursor(scr->rs_ri, on, row, col);
rasops_cursor(ri, 0, 0, 0);
rasops_cursor(ri, 1, scr->rs_crow, scr->rs_ccol);
ri->ri_ops.cursor = rasops_cursor;