/* ttyputc.c - ttyputc */

#include 

/*------------------------------------------------------------------------
 *  ttyputc  -  Write one character to a tty device (interrupts disabled)
 *------------------------------------------------------------------------
 */
devcall ttyputc(
        struct  dentry  *devptr,        /* Entry in device switch table */
        char    ch                      /* Character to write           */
        )
{
        struct  ttycblk *typtr;         /* Pointer to tty control block */

        typtr = &ttytab[devptr->dvminor];

        /* Handle output CRLF by sending CR first */

        if ( ch==TY_NEWLINE && typtr->tyocrlf ) {
                ttyputc(devptr, TY_RETURN);
        }

        wait(typtr->tyosem);            /* Wait for space in queue */
        *typtr->tyotail++ = ch;

        /* Wrap around to beginning of buffer, if needed */

        if (typtr->tyotail >= &typtr->tyobuff[TY_OBUFLEN]) {
                typtr->tyotail = typtr->tyobuff;
        }

        /* Start output in case device is idle */

        ttykickout((struct uart_csreg *)devptr->dvcsr);

        return OK;
}