This patch, put together by Manuel Novoa III, is a merge of work
[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) 1999,2000,2001 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 "busybox.h"
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <mntent.h>
29 #include <sys/vfs.h>
30 #include <getopt.h>
31
32 extern const char mtab_file[];  /* Defined in utility.c */
33 #ifdef BB_FEATURE_HUMAN_READABLE
34 unsigned long disp_hr = KILOBYTE; 
35 #endif
36
37 static int df(char *device, const char *mountPoint)
38 {
39         struct statfs s;
40         long blocks_used;
41         long blocks_percent_used;
42
43         if (statfs(mountPoint, &s) != 0) {
44                 perror_msg("%s", mountPoint);
45                 return FALSE;
46         }
47
48         if (s.f_blocks > 0) {
49                 blocks_used = s.f_blocks - s.f_bfree;
50                 if(0 == blocks_used)
51                         blocks_percent_used = 0;
52                 else
53                         blocks_percent_used = (long)
54                           (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
55                 if (strcmp(device, "/dev/root") == 0) {
56                         /* Adjusts device to be the real root device,
57                          * or leaves device alone if it can't find it */
58                         find_real_root_device_name( device);
59                 }
60 #ifdef BB_FEATURE_HUMAN_READABLE
61                 printf("%-20s %9s",
62                            device,
63                            format((s.f_blocks * s.f_bsize), disp_hr));
64                 printf(" %9s", format((s.f_blocks - s.f_bfree) * s.f_bsize, disp_hr));
65                 printf(" %9s %3ld%% %s\n",
66                            format(s.f_bavail * s.f_bsize, disp_hr),
67                            blocks_percent_used, mountPoint);
68 #else
69                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
70                            device,
71                            (long) (s.f_blocks * (s.f_bsize / 1024.0)),
72                            (long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
73                            (long) (s.f_bavail * (s.f_bsize / 1024.0)),
74                            blocks_percent_used, mountPoint);
75 #endif
76
77         }
78
79         return TRUE;
80 }
81
82 extern int df_main(int argc, char **argv)
83 {
84         int status = EXIT_SUCCESS;
85         int opt = 0;
86         int i = 0;
87
88         while ((opt = getopt(argc, argv, "?"
89 #ifdef BB_FEATURE_HUMAN_READABLE
90         "hm"
91 #endif
92         "k"
93 )) > 0)
94         {
95                 switch (opt) {
96 #ifdef BB_FEATURE_HUMAN_READABLE
97                         case 'h': disp_hr = 0;         break;
98                         case 'm': disp_hr = MEGABYTE;  break;
99                         case 'k': disp_hr = KILOBYTE;  break;
100 #else
101                         case 'k': break;
102 #endif
103                         case '?': goto print_df_usage; break;
104                 }
105         }
106
107         printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
108 #ifdef BB_FEATURE_HUMAN_READABLE
109                    (KILOBYTE == disp_hr) ? "1k-blocks" : "     Size",
110 #else
111                    "1k-blocks",
112 #endif
113                "Used", "Available", "Use%", "Mounted on");
114
115
116         if(optind < argc) {
117                 struct mntent *mountEntry;
118                 for(i = optind; i < argc; i++)
119                 {
120                         if ((mountEntry = find_mount_point(argv[i], mtab_file)) == 0) {
121                                 error_msg("%s: can't find mount point.", argv[i]);
122                                 status = EXIT_FAILURE;
123                         } else if (!df(mountEntry->mnt_fsname, mountEntry->mnt_dir))
124                                 status = EXIT_FAILURE;
125                 }
126         } else {
127                 FILE *mountTable;
128                 struct mntent *mountEntry;
129
130                 mountTable = setmntent(mtab_file, "r");
131                 if (mountTable == 0) {
132                         perror_msg("%s", mtab_file);
133                         return EXIT_FAILURE;
134                 }
135
136                 while ((mountEntry = getmntent(mountTable))) {
137                         if (!df(mountEntry->mnt_fsname, mountEntry->mnt_dir))
138                                 status = EXIT_FAILURE;
139                 }
140                 endmntent(mountTable);
141         }
142
143         return status;
144
145 print_df_usage:
146     show_usage();
147     return(FALSE);
148 }
149
150 /*
151 Local Variables:
152 c-file-style: "linux"
153 c-basic-offset: 4
154 tab-width: 4
155 End:
156 */