Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/tty/ttyControl.c

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/* Embedded XINU, Copyright (C) 2007.  All rights reserved. */

#include <kernel.h>
#include <device.h>
#include <tty.h>

devcall ttyControl(device *pdev, uchar func, uchar arg1, uchar arg2)
{
        struct tty *ptty;
        device *phw;
        char old;

        ptty = (struct tty *)pdev->controlblk;
        ASSERT((NULL != ptty) && (TTY_STATE_ALLOC == ptty->state));

        phw = ptty->tty_phw;
        ASSERT(NULL != phw);

        switch (func)
    {
        /* Set input flags: arg1 = flags to set      */
        /* return old value of flags                 */
        case TTY_IOC_SETIFLAG:
                old = ptty->iflags & arg1;
                ptty->iflags |= (arg1);
                return old;
    
        /* Clear input flags: arg1 = flags to clear  */
        /* return old value of flags                 */ 
    case TTY_IOC_CLRIFLAG:
                old = ptty->iflags & arg1;
                ptty->iflags &= ~(arg1);
                return old;
    
        /* Get input flags:                          */
        /* return = current value of flags           */
    case TTY_IOC_GETIFLAG:
                return ptty->iflags;

        /* Set output flags: arg1 = flags to set     */
        /* return old value of flags                 */
    case TTY_IOC_SETOFLAG:
                old = ptty->oflags & arg1;
                ptty->oflags |= (arg1);
                return old;
    
        /* Clear output flags: arg1 = flags to clear */
        /* return old value of flags                 */ 
    case TTY_IOC_CLROFLAG:
                old = ptty->oflags & arg1;
                ptty->oflags &= ~(arg1);
                return old;

        /* Get output flags:                         */
        /* return current value of flags             */
    case TTY_IOC_GETOFLAG:
                return ptty->oflags;

    /* Return true if EOF was seen in input      */
    case TTY_IOC_EOF:
                return (ptty->iflags & TTY_IFLAG_EOF);

    /* Return true if CBREAK was seen in input   */
    case TTY_IOC_CBREAK:
                return (ptty->iflags & TTY_IFLAG_CBREAK);

        /* Peek at next input character              */
        case TTY_IOC_NEXTC:
                if (ptty->icount < 1)
                {
                        old = (*phw->getc)(phw);
                        ASSERT(old != SYSERR);
                }
                else
                { 
                        old = ptty->inbuf[ptty->istart]; 
                }
                return old;
    }

        return SYSERR;
}

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