419 	struct words **front, **rear;  in cfail()  local
425 	front = rear = queue;  in cfail()
427 		*rear++ = s->nst;  in cfail()
428 		if (rear >= &queue[QSIZE - 1]) overflo();  in cfail()
434 	while (rear!=front) {  in cfail()
441 			*rear = (q = s->nst);  in cfail()
442 			if (front < rear)  in cfail()
443 				if (rear >= &queue[QSIZE-1])  in cfail()
445 					else rear = queue;  in cfail()
446 				else rear++;  in cfail()
448 				if (++rear == front) overflo();  in cfail()