Fix func prototype
[oweals/busybox.git] / 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 <stdio.h>
26 #include <stdlib.h>
27 #include <mntent.h>
28 #include <sys/vfs.h>
29 #include <getopt.h>
30 #include "busybox.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 #ifdef BB_FEATURE_HUMAN_READABLE
43         long divisor, base;
44 #endif  
45
46         if (statfs(mountPoint, &s) != 0) {
47                 perror_msg("%s", mountPoint);
48                 return FALSE;
49         }
50
51         if (s.f_blocks > 0) {
52                 blocks_used = s.f_blocks - s.f_bfree;
53                 if(blocks_used == 0)
54                         blocks_percent_used = 0;
55                 else {
56                         blocks_percent_used = (long)
57                           (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
58                 }
59                 if (strcmp(device, "/dev/root") == 0) {
60                         /* Adjusts device to be the real root device,
61                          * or leaves device alone if it can't find it */
62                         find_real_root_device_name( device);
63                 }
64 #ifdef BB_FEATURE_HUMAN_READABLE
65                 switch (disp_hr) {
66                         case MEGABYTE:
67                                 divisor = KILOBYTE;
68                                 base = KILOBYTE;
69                                 break;
70                         case KILOBYTE:
71                                 divisor = KILOBYTE;
72                                 base = 1;
73                                 break;
74                         default:
75                                 divisor = KILOBYTE;
76                                 base = 0;
77                 }
78
79                 printf("%-20s %9s ", device,
80                            format((s.f_blocks * (s.f_bsize / divisor)), base));
81                 printf("%9s ",
82                            format(((s.f_blocks - s.f_bfree) * 
83                                            (s.f_bsize / divisor)), base));
84                 printf("%9s %3ld%% %s\n",
85                            format((s.f_bavail * (s.f_bsize / divisor)), base),
86                            blocks_percent_used, mountPoint);
87 #else
88                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
89                                 device,
90                                 (long) (s.f_blocks * (s.f_bsize / KILOBYTE)),
91                                 (long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / KILOBYTE)),
92                                 (long) (s.f_bavail * (s.f_bsize / KILOBYTE)),
93                                 blocks_percent_used, mountPoint);
94 #endif
95         }
96
97         return TRUE;
98 }
99
100 extern int df_main(int argc, char **argv)
101 {
102         int status = EXIT_SUCCESS;
103         int opt = 0;
104         int i = 0;
105
106         while ((opt = getopt(argc, argv, 
107 #ifdef BB_FEATURE_HUMAN_READABLE
108         "hm"
109 #endif
110         "k"
111 )) > 0)
112         {
113                 switch (opt) {
114 #ifdef BB_FEATURE_HUMAN_READABLE
115                         case 'h': disp_hr = 0;         break;
116                         case 'm': disp_hr = MEGABYTE;  break;
117 #endif
118                         case 'k': break;
119                         default:
120                                           show_usage();
121                 }
122         }
123
124         printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
125 #ifdef BB_FEATURE_HUMAN_READABLE
126                         (KILOBYTE == disp_hr) ? "1k-blocks" :
127                         (MEGABYTE == disp_hr) ? "1M-blocks" : "     Size",
128 #else
129                    "1k-blocks",
130 #endif
131                "Used", "Available", "Use%", "Mounted on");
132
133
134         if(optind < argc) {
135                 struct mntent *mountEntry;
136                 for(i = optind; i < argc; i++)
137                 {
138                         if ((mountEntry = find_mount_point(argv[i], mtab_file)) == 0) {
139                                 error_msg("%s: can't find mount point.", argv[i]);
140                                 status = EXIT_FAILURE;
141                         } else if (!df(mountEntry->mnt_fsname, mountEntry->mnt_dir))
142                                 status = EXIT_FAILURE;
143                 }
144         } else {
145                 FILE *mountTable;
146                 struct mntent *mountEntry;
147
148                 mountTable = setmntent(mtab_file, "r");
149                 if (mountTable == 0) {
150                         perror_msg("%s", mtab_file);
151                         return EXIT_FAILURE;
152                 }
153
154                 while ((mountEntry = getmntent(mountTable))) {
155                         if (!df(mountEntry->mnt_fsname, mountEntry->mnt_dir))
156                                 status = EXIT_FAILURE;
157                 }
158                 endmntent(mountTable);
159         }
160
161         return status;
162 }
163
164 /*
165 Local Variables:
166 c-file-style: "linux"
167 c-basic-offset: 4
168 tab-width: 4
169 End:
170 */