Return to dk_label.c CVS log

Up to [GnuMach] / Gnu-Mach / device

Annotation of Gnu-Mach/device/dk_label.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1993,1991,1990 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     File: rz_disk.c
        !            28:  *     Author: Alessandro Forin, Carnegie Mellon University
        !            29:  *     Date:   10/90
        !            30:  *
        !            31:  */
        !            32: 
        !            33: #include <sys/types.h>
        !            34: #include <sys/ioctl.h>
        !            35: #include <device/device_types.h>
        !            36: #include <device/disk_status.h>
        !            37: 
        !            38: /* Checksum a disk label */
        !            39: unsigned
        !            40: dkcksum(lp)
        !            41:        struct disklabel *lp;
        !            42: {
        !            43:        register unsigned short *start, *end, sum = 0;
        !            44: 
        !            45:        start = (unsigned short *)lp;
        !            46:        end = (unsigned short*)&lp->d_partitions[lp->d_npartitions];
        !            47:        while (start < end) sum ^= *start++;
        !            48:        return sum;
        !            49: }
        !            50: 
        !            51: /* Perform some checks and then copy a disk label */
        !            52: setdisklabel(lp, nlp)
        !            53:        struct disklabel *lp, *nlp;
        !            54: {
        !            55:        if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
        !            56:            (dkcksum(nlp) != 0))
        !            57:                return D_INVALID_OPERATION;
        !            58:        *lp = *nlp;
        !            59:        return D_SUCCESS;
        !            60: }
        !            61: 
        !            62: dkgetlabel(lp, flavor, data, count)
        !            63:        struct disklabel *lp;
        !            64:        int             flavor;
        !            65:        int *           data;           /* pointer to OUT array */
        !            66:        unsigned int    *count;         /* OUT */
        !            67: {
        !            68: 
        !            69:        switch (flavor) {
        !            70:        /* get */
        !            71:        case DIOCGDINFO:
        !            72:                *(struct disklabel *)data = *lp;
        !            73:                *count = sizeof(struct disklabel)/sizeof(int);
        !            74:                break;
        !            75:        case DIOCGDINFO - (0x10<<16):
        !            76:                *(struct disklabel *)data = *lp;
        !            77:                *count = sizeof(struct disklabel)/sizeof(int) - 4;
        !            78:                break;
        !            79:        }
        !            80: }
        !            81: 
        !            82: print_bsd_label(lp, str)
        !            83: struct disklabel       *lp;
        !            84: char                   *str;
        !            85: {
        !            86: int i;
        !            87:        printf("%s sectors %d, tracks %d, cylinders %d\n",
        !            88:                str, lp->d_nsectors, lp->d_ntracks, lp->d_ncylinders);
        !            89:        printf("%s secpercyl %d, secperunit %d, npartitions %d\n",
        !            90:                str, lp->d_secpercyl, lp->d_secperunit, lp->d_npartitions);
        !            91: 
        !            92:        for (i = 0; i < lp->d_npartitions; i++) {
        !            93:                printf("%s    %c: size = %d, offset = %d\n",
        !            94:                        str, 'a'+i,
        !            95:                        lp->d_partitions[i].p_size,
        !            96:                        lp->d_partitions[i].p_offset);
        !            97:        }
        !            98: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.