2 * Mini df implementation for busybox
4 * Copyright (C) 1999 by Lineo, inc.
5 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
6 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 static const char df_usage[] = "df [filesystem ...]\n"
32 "\n" "\tPrint the filesystem space used and space available.\n";
34 extern const char mtab_file[]; /* Defined in utility.c */
36 static int df(char *device, const char *mountPoint)
40 long blocks_percent_used;
42 if (statfs(mountPoint, &s) != 0) {
48 blocks_used = s.f_blocks - s.f_bfree;
49 blocks_percent_used = (long)
50 (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
51 if (strcmp(device, "/dev/root") == 0)
52 device = (getfsfile("/"))->fs_spec;
54 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
56 (long) (s.f_blocks * (s.f_bsize / 1024.0)),
57 (long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
58 (long) (s.f_bavail * (s.f_bsize / 1024.0)),
59 blocks_percent_used, mountPoint);
67 * Given a block device, find the mount table entry if that block device
70 * Given any other file (or directory), find the mount table entry for its
73 extern struct mntent *findMountPoint(const char *name, const char *table)
78 struct mntent *mountEntry;
80 if (stat(name, &s) != 0)
83 if ((s.st_mode & S_IFMT) == S_IFBLK)
84 mountDevice = s.st_rdev;
86 mountDevice = s.st_dev;
89 if ((mountTable = setmntent(table, "r")) == 0)
92 while ((mountEntry = getmntent(mountTable)) != 0) {
93 if (strcmp(name, mountEntry->mnt_dir) == 0
94 || strcmp(name, mountEntry->mnt_fsname) == 0) /* String match. */
96 if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
98 if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
101 endmntent(mountTable);
107 extern int df_main(int argc, char **argv)
109 printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
110 "1k-blocks", "Used", "Available", "Use%", "Mounted on");
113 struct mntent *mountEntry;
117 if ((mountEntry = findMountPoint(argv[1], mtab_file)) ==
119 fprintf(stderr, "%s: can't find mount point.\n", argv[1]);
122 status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
131 struct mntent *mountEntry;
133 mountTable = setmntent(mtab_file, "r");
134 if (mountTable == 0) {
139 while ((mountEntry = getmntent(mountTable))) {
140 int status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
144 endmntent(mountTable);