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Annotation of xinu/sys/ttygetc.c, revision 1.1

1.1     ! root        1: /* ttygetc.c - ttygetc */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <tty.h>
        !             6: #include <io.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  ttygetc - read one character from a tty device
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: ttygetc(devptr)
        !            13: struct devsw   *devptr;
        !            14: {
        !            15:        PStype  ps;
        !            16:        int     ch;
        !            17:        struct  tty   *iptr;
        !            18: 
        !            19:        disable(ps);
        !            20:        iptr = &tty[devptr->dvminor];
        !            21:        wait(iptr->isem);               /* wait for a character in buff */
        !            22:        ch = LOWBYTE & iptr->ibuff[iptr->itail++];
        !            23:        if (iptr->itail >= IBUFLEN)
        !            24:                iptr->itail = 0;
        !            25:        if (iptr->ieof && (iptr->ieofc == ch) )
        !            26:                ch = EOF;
        !            27:        restore(ps);
        !            28:        return(ch);
        !            29: }

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