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Annotation of xinu/sys/ttygetc.c, revision 1.1.1.1

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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