A few updates (including the cp fix the Craig has been looking for)
[platform/upstream/busybox.git] / coreutils / df.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini df implementation for busybox
4  *
5  * Copyright (C) 1999 by Lineo, inc.
6  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
7  * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  *
23  */
24
25 #include "internal.h"
26 #include <stdio.h>
27 #include <mntent.h>
28 #include <sys/stat.h>
29 #include <sys/vfs.h>
30 #include <fstab.h>
31
32 static const char df_usage[] = "df [filesystem ...]\n"
33
34         "\n" "\tPrint the filesystem space used and space available.\n";
35
36 extern const char mtab_file[];  /* Defined in utility.c */
37
38 static int df(char *device, const char *mountPoint)
39 {
40         struct statfs s;
41         long blocks_used;
42         long blocks_percent_used;
43         struct fstab *fstabItem;
44
45         if (statfs(mountPoint, &s) != 0) {
46                 perror(mountPoint);
47                 return FALSE;
48         }
49
50         if (s.f_blocks > 0) {
51                 blocks_used = s.f_blocks - s.f_bfree;
52                 blocks_percent_used = (long)
53                         (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
54                 /* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
55                 if (strcmp(device, "/dev/root") == 0) {
56                         fstabItem = getfsfile("/");
57                         if (fstabItem != NULL)
58                                 device = fstabItem->fs_spec;
59                 }
60                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
61                            device,
62                            (long) (s.f_blocks * (s.f_bsize / 1024.0)),
63                            (long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
64                            (long) (s.f_bavail * (s.f_bsize / 1024.0)),
65                            blocks_percent_used, mountPoint);
66
67         }
68
69         return TRUE;
70 }
71
72 extern int df_main(int argc, char **argv)
73 {
74         printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
75                    "1k-blocks", "Used", "Available", "Use%", "Mounted on");
76
77         if (argc > 1) {
78                 struct mntent *mountEntry;
79                 int status;
80
81                 while (argc > 1) {
82                         if ((mountEntry = findMountPoint(argv[1], mtab_file)) == 0) {
83                                 fprintf(stderr, "%s: can't find mount point.\n", argv[1]);
84                                 exit(FALSE);
85                         }
86                         status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
87                         if (status != 0)
88                                 exit(status);
89                         argc--;
90                         argv++;
91                 }
92                 exit(TRUE);
93         } else {
94                 FILE *mountTable;
95                 struct mntent *mountEntry;
96
97                 mountTable = setmntent(mtab_file, "r");
98                 if (mountTable == 0) {
99                         perror(mtab_file);
100                         exit(FALSE);
101                 }
102
103                 while ((mountEntry = getmntent(mountTable))) {
104                         df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
105                 }
106                 endmntent(mountTable);
107         }
108
109         exit(TRUE);
110 }
111
112 /*
113 Local Variables:
114 c-file-style: "linux"
115 c-basic-offset: 4
116 tab-width: 4
117 End:
118 */