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Annotation of researchv10no/sys/io/bad144.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * DEC STD 144 bad block replacement
        !             3:  * given a cylinder, track, sector
        !             4:  * return a replacement block
        !             5:  * the return is an offset:
        !             6:  * lbn = (size of disk) - (size of a track) - repno
        !             7:  */
        !             8: 
        !             9: #include "sys/bad144.h"
        !            10: 
        !            11: int
        !            12: bad144rep(bt, cyl, trk, sec)
        !            13:        register struct bad144 *bt;
        !            14: {
        !            15:        register int i;
        !            16:        register long blk, bblk;
        !            17: 
        !            18:        blk = ((long)cyl << 16) + (trk << 8) + sec;
        !            19:        for (i = 0; i < NBADDESC; i++) {
        !            20:                bblk = ((long)bt->bt_bad[i].bt_cyl << 16) + bt->bt_bad[i].bt_trksec;
        !            21:                if (blk == bblk)
        !            22:                        return (i);
        !            23:                if (blk < bblk || bblk < 0)
        !            24:                        break;
        !            25:        }
        !            26:        return (-1);
        !            27: }

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