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/*
* Mini df implementation for busybox
*
* Copyright (C) 1999 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <stdio.h>
#include <mntent.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <fstab.h>
static const char df_usage[] = "df [filesystem ...]\n"
"\n" "\tPrint the filesystem space used and space available.\n";
static int df(char *device, const char *mountPoint)
{
struct statfs s;
long blocks_used;
long blocks_percent_used;
if (statfs(mountPoint, &s) != 0) {
perror(mountPoint);
return 1;
}
if (s.f_blocks > 0) {
blocks_used = s.f_blocks - s.f_bfree;
blocks_percent_used = (long)
(blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
if (strcmp(device, "/dev/root") == 0)
device = (getfsfile("/"))->fs_spec;
printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
device,
(long) (s.f_blocks * (s.f_bsize / 1024.0)),
(long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
(long) (s.f_bavail * (s.f_bsize / 1024.0)),
blocks_percent_used, mountPoint);
}
return 0;
}
/*
* Given a block device, find the mount table entry if that block device
* is mounted.
*
* Given any other file (or directory), find the mount table entry for its
* filesystem.
*/
extern struct mntent *findMountPoint(const char *name, const char *table)
{
struct stat s;
dev_t mountDevice;
FILE *mountTable;
struct mntent *mountEntry;
if (stat(name, &s) != 0)
return 0;
if ((s.st_mode & S_IFMT) == S_IFBLK)
mountDevice = s.st_rdev;
else
mountDevice = s.st_dev;
if ((mountTable = setmntent(table, "r")) == 0)
return 0;
while ((mountEntry = getmntent(mountTable)) != 0) {
if (strcmp(name, mountEntry->mnt_dir) == 0
|| strcmp(name, mountEntry->mnt_fsname) == 0) /* String match. */
break;
if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
break;
if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
break;
}
endmntent(mountTable);
return mountEntry;
}
extern int df_main(int argc, char **argv)
{
printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
"1k-blocks", "Used", "Available", "Use%", "Mounted on");
if (argc > 1) {
struct mntent *mountEntry;
int status;
while (argc > 1) {
if ((mountEntry = findMountPoint(argv[1], "/proc/mounts")) ==
0) {
fprintf(stderr, "%s: can't find mount point.\n", argv[1]);
return 1;
}
status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
if (status != 0)
return status;
argc--;
argv++;
}
return 0;
} else {
FILE *mountTable;
struct mntent *mountEntry;
mountTable = setmntent("/proc/mounts", "r");
if (mountTable == 0) {
perror("/proc/mounts");
exit(FALSE);
}
while ((mountEntry = getmntent(mountTable))) {
int status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
if (status)
return status;
}
endmntent(mountTable);
}
return 0;
}
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