O_NUMBER_LENGTH
((O_ISSET((sp), O_NUMBER) ? (sp)->cols - O_NUMBER_LENGTH : (sp)->cols))
cols_per_screen -= O_NUMBER_LENGTH;
*xp += O_NUMBER_LENGTH;
cnt -= O_NUMBER_LENGTH;
scno += O_NUMBER_LENGTH;
curoff += O_NUMBER_LENGTH;
vip->sc_col - (O_ISSET(sp, O_NUMBER) ? O_NUMBER_LENGTH : 0);