import base_device.c for fsck

git-svn-id: svn://busybox.net/trunk/busybox@10278 69ca8d6d-28ef-0310-b511-8ec308f3f277
author: vapier <vapier@69ca8d6d-28ef-0310-b511-8ec308f3f277> 2005-05-09 22:09:00 +0000
committer: vapier <vapier@69ca8d6d-28ef-0310-b511-8ec308f3f277> 2005-05-09 22:09:00 +0000
commit: 719b667f0c6acd3df3a4c21b2267d5f24b0c4ea2 (patch)
tree: e772907c7f8c06ebb57f4099c8b8f441ade9eee5
parent: 5548996a3b39bd718d3b0dbe983181acc5b03e6f (diff)
download: busybox-w32-719b667f0c6acd3df3a4c21b2267d5f24b0c4ea2.tar.gz
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1 files changed, 147 insertions, 0 deletions
diff --git a/e2fsprogs/base_device.c b/e2fsprogs/base_device.c
new file mode 100644
index 000000000..d81bb0952
--- /dev/null
+++ b/e2fsprogs/base_device.c
@@ -0,0 +1,147 @@
+/*
+ * base_device.c
+ *
+ * Return the "base device" given a particular device; this is used to
+ * assure that we only fsck one partition on a particular drive at any
+ * one time.  Otherwise, the disk heads will be seeking all over the
+ * place.  If the base device can not be determined, return NULL.
+ * 
+ * The base_device() function returns an allocated string which must
+ * be freed.
+ * 
+ * Written by Theodore Ts'o, <tytso@mit.edu>
+ * 
+ * Copyright (C) 2000 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include "busybox.h"
+#ifdef CONFIG_FEATURE_DEVFS
+/*
+ * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
+ * pathames.
+ */
+static const char *devfs_hier[] = {
+        "host", "bus", "target", "lun", 0
+};
+#endif
+char *base_device(const char *device)
+{
+        char *str, *cp;
+#ifdef CONFIG_FEATURE_DEVFS
+        const char **hier, *disk;
+        int len;
+#endif
+        cp = str = bb_xstrdup(device);
+        /* Skip over /dev/; if it's not present, give up. */
+        if (strncmp(cp, "/dev/", 5) != 0)
+                goto errout;
+        cp += 5;
+#if 0   /* this is for old stuff no one uses anymore ? */
+        /* Skip over /dev/dsk/... */
+        if (strncmp(cp, "dsk/", 4) == 0)
+                cp += 4;
+#endif
+        /*
+         * For md devices, we treat them all as if they were all
+         * on one disk, since we don't know how to parallelize them.
+         */
+        if (cp[0] == 'm' && cp[1] == 'd') {
+                *(cp+2) = 0;
+                return str;
+        }
+        /* Handle DAC 960 devices */
+        if (strncmp(cp, "rd/", 3) == 0) {
+                cp += 3;
+                if (cp[0] != 'c' || cp[2] != 'd' ||
+                    !isdigit(cp[1]) || !isdigit(cp[3]))
+                        goto errout;
+                *(cp+4) = 0;
+                return str;
+        }
+        /* Now let's handle /dev/hd* and /dev/sd* devices.... */
+        if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) {
+                cp += 2;
+                /* If there's a single number after /dev/hd, skip it */
+                if (isdigit(*cp))
+                        cp++;
+                /* What follows must be an alpha char, or give up */
+                if (!isalpha(*cp))
+                        goto errout;
+                *(cp + 1) = 0;
+                return str;
+        }
+#ifdef CONFIG_FEATURE_DEVFS
+        /* Now let's handle devfs (ugh) names */
+        len = 0;
+        if (strncmp(cp, "ide/", 4) == 0)
+                len = 4;
+        if (strncmp(cp, "scsi/", 5) == 0)
+                len = 5;
+        if (len) {
+                cp += len;
+                /*
+                 * Now we proceed down the expected devfs hierarchy.
+                 * i.e., .../host1/bus2/target3/lun4/...
+                 * If we don't find the expected token, followed by
+                 * some number of digits at each level, abort.
+                 */
+                for (hier = devfs_hier; *hier; hier++) {
+                        len = strlen(*hier);
+                        if (strncmp(cp, *hier, len) != 0)
+                                goto errout;
+                        cp += len;
+                        while (*cp != '/' && *cp != 0) {
+                                if (!isdigit(*cp))
+                                        goto errout;
+                                cp++;
+                        }
+                        cp++;
+                }
+                *(cp - 1) = 0;
+                return str;
+        }
+        /* Now handle devfs /dev/disc or /dev/disk names */
+        disk = 0;
+        if (strncmp(cp, "discs/", 6) == 0)
+                disk = "disc";
+        else if (strncmp(cp, "disks/", 6) == 0)
+                disk = "disk";
+        if (disk) {
+                cp += 6;
+                if (strncmp(cp, disk, 4) != 0)
+                        goto errout;
+                cp += 4;
+                while (*cp != '/' && *cp != 0) {
+                        if (!isdigit(*cp))
+                                goto errout;
+                        cp++;
+                }
+                *cp = 0;
+                return str;
+        }
+#endif
+errout:
+        free(str);
+        return NULL;
+}
author	vapier <vapier@69ca8d6d-28ef-0310-b511-8ec308f3f277>	2005-05-09 22:09:00 +0000
committer	vapier <vapier@69ca8d6d-28ef-0310-b511-8ec308f3f277>	2005-05-09 22:09:00 +0000
commit	719b667f0c6acd3df3a4c21b2267d5f24b0c4ea2 (patch)
tree	e772907c7f8c06ebb57f4099c8b8f441ade9eee5
parent	5548996a3b39bd718d3b0dbe983181acc5b03e6f (diff)
download	busybox-w32-719b667f0c6acd3df3a4c21b2267d5f24b0c4ea2.tar.gz busybox-w32-719b667f0c6acd3df3a4c21b2267d5f24b0c4ea2.tar.bz2 busybox-w32-719b667f0c6acd3df3a4c21b2267d5f24b0c4ea2.zip

diff --git a/e2fsprogs/base_device.c b/e2fsprogs/base_device.c new file mode 100644 index 000000000..d81bb0952 --- /dev/null +++ b/e2fsprogs/base_device.c
@@ -0,0 +1,147 @@
	1	/*
	2	* base_device.c
	3	*
	4	* Return the "base device" given a particular device; this is used to
	5	* assure that we only fsck one partition on a particular drive at any
	6	* one time. Otherwise, the disk heads will be seeking all over the
	7	* place. If the base device can not be determined, return NULL.
	8	*
	9	* The base_device() function returns an allocated string which must
	10	* be freed.
	11	*
	12	* Written by Theodore Ts'o, <tytso@mit.edu>
	13	*
	14	* Copyright (C) 2000 Theodore Ts'o.
	15	*
	16	* %Begin-Header%
	17	* This file may be redistributed under the terms of the GNU Public
	18	* License.
	19	* %End-Header%
	20	*/
	21	#include <stdio.h>
	22	#include <unistd.h>
	23	#include <stdlib.h>
	24	#include <ctype.h>
	25	#include <string.h>
	26
	27	#include "busybox.h"
	28
	29	#ifdef CONFIG_FEATURE_DEVFS
	30	/*
	31	* Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
	32	* pathames.
	33	*/
	34	static const char *devfs_hier[] = {
	35	"host", "bus", "target", "lun", 0
	36	};
	37	#endif
	38
	39	char base_device(const char device)
	40	{
	41	char str, cp;
	42	#ifdef CONFIG_FEATURE_DEVFS
	43	const char *hier, disk;
	44	int len;
	45	#endif
	46
	47	cp = str = bb_xstrdup(device);
	48
	49	/* Skip over /dev/; if it's not present, give up. */
	50	if (strncmp(cp, "/dev/", 5) != 0)
	51	goto errout;
	52	cp += 5;
	53
	54	#if 0 /* this is for old stuff no one uses anymore ? */
	55	/* Skip over /dev/dsk/... */
	56	if (strncmp(cp, "dsk/", 4) == 0)
	57	cp += 4;
	58	#endif
	59
	60	/*
	61	* For md devices, we treat them all as if they were all
	62	* on one disk, since we don't know how to parallelize them.
	63	*/
	64	if (cp[0] == 'm' && cp[1] == 'd') {
	65	*(cp+2) = 0;
	66	return str;
	67	}
	68
	69	/* Handle DAC 960 devices */
	70	if (strncmp(cp, "rd/", 3) == 0) {
	71	cp += 3;
	72	if (cp[0] != 'c' \|\| cp[2] != 'd' \|\|
	73	!isdigit(cp[1]) \|\| !isdigit(cp[3]))
	74	goto errout;
	75	*(cp+4) = 0;
	76	return str;
	77	}
	78
	79	/* Now let's handle /dev/hd* and /dev/sd* devices.... */
	80	if ((cp[0] == 'h' \|\| cp[0] == 's') && (cp[1] == 'd')) {
	81	cp += 2;
	82	/* If there's a single number after /dev/hd, skip it */
	83	if (isdigit(*cp))
	84	cp++;
	85	/* What follows must be an alpha char, or give up */
	86	if (!isalpha(*cp))
	87	goto errout;
	88	*(cp + 1) = 0;
	89	return str;
	90	}
	91
	92	#ifdef CONFIG_FEATURE_DEVFS
	93	/* Now let's handle devfs (ugh) names */
	94	len = 0;
	95	if (strncmp(cp, "ide/", 4) == 0)
	96	len = 4;
	97	if (strncmp(cp, "scsi/", 5) == 0)
	98	len = 5;
	99	if (len) {
	100	cp += len;
	101	/*
	102	* Now we proceed down the expected devfs hierarchy.
	103	* i.e., .../host1/bus2/target3/lun4/...
	104	* If we don't find the expected token, followed by
	105	* some number of digits at each level, abort.
	106	*/
	107	for (hier = devfs_hier; *hier; hier++) {
	108	len = strlen(*hier);
	109	if (strncmp(cp, *hier, len) != 0)
	110	goto errout;
	111	cp += len;
	112	while (cp != '/' && cp != 0) {
	113	if (!isdigit(*cp))
	114	goto errout;
	115	cp++;
	116	}
	117	cp++;
	118	}
	119	*(cp - 1) = 0;
	120	return str;
	121	}
	122
	123	/* Now handle devfs /dev/disc or /dev/disk names */
	124	disk = 0;
	125	if (strncmp(cp, "discs/", 6) == 0)
	126	disk = "disc";
	127	else if (strncmp(cp, "disks/", 6) == 0)
	128	disk = "disk";
	129	if (disk) {
	130	cp += 6;
	131	if (strncmp(cp, disk, 4) != 0)
	132	goto errout;
	133	cp += 4;
	134	while (cp != '/' && cp != 0) {
	135	if (!isdigit(*cp))
	136	goto errout;
	137	cp++;
	138	}
	139	*cp = 0;
	140	return str;
	141	}
	142	#endif
	143
	144	errout:
	145	free(str);
	146	return NULL;
	147	}