/* getc.c - getc */

#include 

/*------------------------------------------------------------------------
 *  getc  -  Obtain one byte from a device
 *------------------------------------------------------------------------
 */
syscall getc(
          did32         descrp          /* Descriptor for device        */
        )
{
        intmask         mask;           /* Saved interrupt mask         */
        struct dentry   *devptr;        /* Entry in device switch table */
        int32           retval;         /* Value to return to caller    */

        mask = disable();
        if (isbaddev(descrp)) {
                restore(mask);
                return SYSERR;
        }
        devptr = (struct dentry *) &devtab[descrp];
        retval = (*devptr->dvgetc) (devptr);
        restore(mask);
        return retval;
}