e2fsprogs/misc/base_device.c
Theodore Ts'o d1154eb460 Shorten compile commands run by the build system
The DEFS line in MCONFIG had gotten so long that it exceeded 4k, and
this was starting to cause some tools heartburn.  It also made "make
V=1" almost useless, since trying to following the individual commands
run by make was lost in the noise of all of the defines.

So fix this by putting the configure-generated defines in lib/config.h
and the directory pathnames to lib/dirpaths.h.

In addition, clean up some vestigal defines in configure.in and in the
Makefiles to further shorten the cc command lines.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-18 17:34:37 -04:00

171 lines
3.4 KiB
C

/*
* 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 "config.h"
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <ctype.h>
#include <string.h>
#include "fsck.h"
/*
* Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
* pathames.
*/
static const char *devfs_hier[] = {
"host", "bus", "target", "lun", 0
};
char *base_device(const char *device)
{
char *str, *cp;
const char **hier, *disk;
int len;
str = malloc(strlen(device)+1);
if (!str)
return NULL;
strcpy(str, device);
cp = str;
/* Skip over /dev/; if it's not present, give up. */
if (strncmp(cp, "/dev/", 5) != 0)
goto errout;
cp += 5;
/* Skip over /dev/dsk/... */
if (strncmp(cp, "dsk/", 4) == 0)
cp += 4;
/*
* 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;
}
/* 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;
}
errout:
free(str);
return NULL;
}
#ifdef DEBUG
int main(int argc, char** argv)
{
const char *base;
char buf[256], *cp;
while (1) {
if (fgets(buf, sizeof(buf), stdin) == NULL)
break;
cp = strchr(buf, '\n');
if (cp)
*cp = 0;
cp = strchr(buf, '\t');
if (cp)
*cp = 0;
base = base_device(buf);
printf("%s\t%s\n", buf, base ? base : "NONE");
}
exit(0);
}
#endif