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Annotation of researchv9/sys/boot/stand/chklabel.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * @(#)chklabel.c 1.1 86/02/03 Copyright (c) 1985 by Sun Microsystems, Inc.
        !             3:  */
        !             4: 
        !             5: #include <sys/types.h>
        !             6: #include <sun/dklabel.h>
        !             7: 
        !             8: char msg_nolabel[] = "No label found - attempting boot anyway.\n";
        !             9: 
        !            10: /*
        !            11:  * Checks a disk label, returns 0 for success, 1 for failure.
        !            12:  * If the magic number is right but the checksum is wrong, prints
        !            13:  * "Corrupt label" error message, otherwise is silent.
        !            14:  */
        !            15: chklabel(label)
        !            16:        register struct dk_label *label;
        !            17: {
        !            18:        register int count, sum = 0;
        !            19:        register short *sp;
        !            20: 
        !            21:        if (label->dkl_magic != DKL_MAGIC)
        !            22:                return (1);
        !            23:        count = sizeof (struct dk_label) / sizeof (short);
        !            24:        sp = (short *)label;
        !            25:        while (count--) 
        !            26:                sum ^= *sp++;
        !            27:        if (sum != 0) {
        !            28:                printf("Corrupt label\n");
        !            29:                return (1);
        !            30:        }
        !            31:        return (0);
        !            32: }

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