/*
* Put a character into a queue.
*/
static void tty_putc(int c, struct tty_queue *tq)
{
int s = splhigh();
if (ttyq_full(tq)) {
splx(s);
return;
}
tq->tq_buf[tq->tq_tail] = (char)(c & 0xFF);
tq->tq_tail = ttyq_next(tq->tq_tail);
tq->tq_count++;
splx(s);
}
/*
* Get a character from a queue.
*/
int tty_getc(struct tty_queue *tq)
{
int s = splhigh();
if (ttyq_empty(tq)) {
splx(s);
return -1;
}
int c = tq->tq_buf[tq->tq_head];
tq->tq_head = ttyq_next(tq->tq_head);
tq->tq_count--;
splx(s);
return c & 0xFF;
}
/*
* Put a character into a queue.
*/
void
ttyq_putc(int c, struct tty_queue *tq)
{
irq_lock();
if (ttyq_full(tq)) {
irq_unlock();
return;
}
tq->tq_buf[tq->tq_tail] = c;
tq->tq_tail = ttyq_next(tq->tq_tail);
tq->tq_count++;
irq_unlock();
}
/*
* Get a character from a queue.
*/
int
ttyq_getc(struct tty_queue *tq)
{
int c;
irq_lock();
if (ttyq_empty(tq)) {
irq_unlock();
return -1;
}
c = tq->tq_buf[tq->tq_head];
tq->tq_head = ttyq_next(tq->tq_head);
tq->tq_count--;
irq_unlock();
return c;
}
