/* ttygetc.c - ttygetc */

#include 

/*------------------------------------------------------------------------
 *  ttygetc  -  Read one character from a tty device (interrupts disabled)
 *------------------------------------------------------------------------
 */
devcall ttygetc(
          struct dentry *devptr         /* Entry in device switch table */
        )
{
        char    ch;                     /* Character to return          */
        struct  ttycblk *typtr;         /* Pointer to ttytab entry      */

        typtr = &ttytab[devptr->dvminor];

        /* Wait for a character in the buffer and extract one character */

        wait(typtr->tyisem);
        ch = *typtr->tyihead++;

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

        if (typtr->tyihead >= &typtr->tyibuff[TY_IBUFLEN]) {
                typtr->tyihead = typtr->tyibuff;
        }

        /* In cooked mode, check for the EOF character */

        if ( (typtr->tyimode == TY_IMCOOKED) && (typtr->tyeof) &&
             (ch == typtr->tyeofch) ) {
                return (devcall)EOF;
        }

        return (devcall)(0xff & ch);
}