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Annotation of coherent/d/PS2_KERNEL/coh.286/fifo_read.c, revision 1.1

1.1     ! root        1: /* fifo_read.c -- Read from an internally typed fifo.  */
        !             2: #include <sys/typed.h>
        !             3: 
        !             4: /* Read a typed space from a fifo.
        !             5:  * Return a pointer to the next typed space in the fifo ffp.  Returns
        !             6:  * NULL on end of fifo.
        !             7:  *
        !             8:  * This read assumes that ffp->f_space has type T_FIFO_SIC.
        !             9:  */
        !            10: typed_space *
        !            11: fifo_read(ffp)
        !            12:        register FIFO *ffp;
        !            13: {
        !            14:        typed_space *retval;
        !            15: 
        !            16:        /* Read MUST be set.  */
        !            17:        if (F_READ != F_READ & ffp->f_flags ) {
        !            18:                return(T_NULL);  /* This ffp is not open for reading.  */
        !            19:        }
        !            20: 
        !            21:        /* From here to the end of fifo_read is really fifo_read_sic().  */
        !            22: 
        !            23: 
        !            24:        /* Space of size 0 marks EOFIFO.  */
        !            25:        if ((long)0 == ffp->f_offset->ts_size) {
        !            26:                retval = T_NULL;
        !            27:        } else {
        !            28:                /* Return the next space.  */
        !            29:                retval = ffp->f_offset;
        !            30:                /* Advance to the next space.  */
        !            31:                (char *) ffp->f_offset += ffp->f_offset->ts_size;
        !            32:        }
        !            33: 
        !            34:        return(retval);
        !            35: } /* fifo_read() */

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