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148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
/*
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* base_device.c
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*
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* Return the "base device" given a particular device; this is used to
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* assure that we only fsck one partition on a particular drive at any
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* one time. Otherwise, the disk heads will be seeking all over the
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* place. If the base device can not be determined, return NULL.
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*
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* The base_device() function returns an allocated string which must
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* be freed.
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*
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* Written by Theodore Ts'o, <tytso@mit.edu>
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*
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* Copyright (C) 2000 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include "busybox.h"
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#ifdef CONFIG_FEATURE_DEVFS
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/*
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* Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
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* pathames.
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*/
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static const char *devfs_hier[] = {
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"host", "bus", "target", "lun", 0
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};
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#endif
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char *base_device(const char *device)
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{
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char *str, *cp;
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#ifdef CONFIG_FEATURE_DEVFS
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const char **hier, *disk;
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int len;
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#endif
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cp = str = bb_xstrdup(device);
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/* Skip over /dev/; if it's not present, give up. */
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if (strncmp(cp, "/dev/", 5) != 0)
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goto errout;
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cp += 5;
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#if 0 /* this is for old stuff no one uses anymore ? */
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/* Skip over /dev/dsk/... */
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if (strncmp(cp, "dsk/", 4) == 0)
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cp += 4;
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#endif
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/*
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* For md devices, we treat them all as if they were all
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* on one disk, since we don't know how to parallelize them.
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*/
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if (cp[0] == 'm' && cp[1] == 'd') {
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*(cp+2) = 0;
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return str;
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}
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/* Handle DAC 960 devices */
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if (strncmp(cp, "rd/", 3) == 0) {
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cp += 3;
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if (cp[0] != 'c' || cp[2] != 'd' ||
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!isdigit(cp[1]) || !isdigit(cp[3]))
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goto errout;
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*(cp+4) = 0;
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return str;
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}
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/* Now let's handle /dev/hd* and /dev/sd* devices.... */
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if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) {
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cp += 2;
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/* If there's a single number after /dev/hd, skip it */
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if (isdigit(*cp))
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cp++;
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/* What follows must be an alpha char, or give up */
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if (!isalpha(*cp))
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goto errout;
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*(cp + 1) = 0;
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return str;
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}
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#ifdef CONFIG_FEATURE_DEVFS
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/* Now let's handle devfs (ugh) names */
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len = 0;
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if (strncmp(cp, "ide/", 4) == 0)
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len = 4;
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if (strncmp(cp, "scsi/", 5) == 0)
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len = 5;
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if (len) {
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cp += len;
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/*
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* Now we proceed down the expected devfs hierarchy.
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* i.e., .../host1/bus2/target3/lun4/...
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* If we don't find the expected token, followed by
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* some number of digits at each level, abort.
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*/
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for (hier = devfs_hier; *hier; hier++) {
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len = strlen(*hier);
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if (strncmp(cp, *hier, len) != 0)
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goto errout;
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cp += len;
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while (*cp != '/' && *cp != 0) {
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if (!isdigit(*cp))
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goto errout;
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cp++;
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}
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cp++;
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}
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*(cp - 1) = 0;
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return str;
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}
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/* Now handle devfs /dev/disc or /dev/disk names */
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disk = 0;
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if (strncmp(cp, "discs/", 6) == 0)
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disk = "disc";
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else if (strncmp(cp, "disks/", 6) == 0)
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disk = "disk";
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if (disk) {
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cp += 6;
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if (strncmp(cp, disk, 4) != 0)
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goto errout;
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cp += 4;
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while (*cp != '/' && *cp != 0) {
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if (!isdigit(*cp))
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goto errout;
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cp++;
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}
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*cp = 0;
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return str;
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}
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#endif
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errout:
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free(str);
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return NULL;
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}
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