Teach libc5 what a sighandler_t is
[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 <string.h>
28 #include <mntent.h>
29 #include <sys/vfs.h>
30 #include <getopt.h>
31 #include "busybox.h"
32
33 extern const char mtab_file[];  /* Defined in utility.c */
34 #ifdef BB_FEATURE_HUMAN_READABLE
35 static unsigned long df_disp_hr = KILOBYTE; 
36 #endif
37
38 static int do_df(char *device, const char *mount_point)
39 {
40         struct statfs s;
41         long blocks_used;
42         long blocks_percent_used;
43
44         if (statfs(mount_point, &s) != 0) {
45                 perror_msg("%s", mount_point);
46                 return FALSE;
47         }
48
49         if (s.f_blocks > 0) {
50                 blocks_used = s.f_blocks - s.f_bfree;
51                 if(blocks_used == 0)
52                         blocks_percent_used = 0;
53                 else {
54                         blocks_percent_used = (long)
55                           (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
56                 }
57                 if (strcmp(device, "/dev/root") == 0) {
58                         /* Adjusts device to be the real root device,
59                          * or leaves device alone if it can't find it */
60                         device = find_real_root_device_name(device);
61                         if(device==NULL)
62                                 return FALSE;
63                 }
64 #ifdef BB_FEATURE_HUMAN_READABLE
65                 printf("%-20s %9s ", device,
66                                 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
67
68                 printf("%9s ",
69                                 make_human_readable_str( (s.f_blocks - s.f_bfree), s.f_bsize, df_disp_hr));
70
71                 printf("%9s %3ld%% %s\n",
72                                 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
73                                 blocks_percent_used, mount_point);
74 #else
75                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
76                                 device,
77                                 (long) (s.f_blocks * (s.f_bsize / (double)KILOBYTE)),
78                                 (long) ((s.f_blocks - s.f_bfree)*(s.f_bsize/(double)KILOBYTE)),
79                                 (long) (s.f_bavail * (s.f_bsize / (double)KILOBYTE)),
80                                 blocks_percent_used, mount_point);
81 #endif
82         }
83
84         return TRUE;
85 }
86
87 extern int df_main(int argc, char **argv)
88 {
89         int status = EXIT_SUCCESS;
90         int opt = 0;
91         int i = 0;
92         char disp_units_hdr[80] = "1k-blocks"; /* default display is kilobytes */
93
94         while ((opt = getopt(argc, argv, "k"
95 #ifdef BB_FEATURE_HUMAN_READABLE
96         "hm"
97 #endif
98 )) > 0)
99         {
100                 switch (opt) {
101 #ifdef BB_FEATURE_HUMAN_READABLE
102                         case 'h':
103                                 df_disp_hr = 0;
104                                 strcpy(disp_units_hdr, "     Size");
105                                 break;
106                         case 'm':
107                                 df_disp_hr = MEGABYTE;
108                                 strcpy(disp_units_hdr, "1M-blocks");
109                                 break;
110 #endif
111                         case 'k':
112                                 /* default display is kilobytes */
113                                 break;
114                         default:
115                                           show_usage();
116                 }
117         }
118
119         printf("%-20s %-14s %s %s %s %s\n", "Filesystem", disp_units_hdr,
120                "Used", "Available", "Use%", "Mounted on");
121
122         if(optind < argc) {
123                 struct mntent *mount_entry;
124                 for(i = optind; i < argc; i++)
125                 {
126                         if ((mount_entry = find_mount_point(argv[i], mtab_file)) == 0) {
127                                 error_msg("%s: can't find mount point.", argv[i]);
128                                 status = EXIT_FAILURE;
129                         } else if (!do_df(mount_entry->mnt_fsname, mount_entry->mnt_dir))
130                                 status = EXIT_FAILURE;
131                 }
132         } else {
133                 FILE *mount_table;
134                 struct mntent *mount_entry;
135
136                 mount_table = setmntent(mtab_file, "r");
137                 if (mount_table == 0) {
138                         perror_msg("%s", mtab_file);
139                         return EXIT_FAILURE;
140                 }
141
142                 while ((mount_entry = getmntent(mount_table))) {
143                         if (!do_df(mount_entry->mnt_fsname, mount_entry->mnt_dir))
144                                 status = EXIT_FAILURE;
145                 }
146                 endmntent(mount_table);
147         }
148
149         return status;
150 }
151
152 /*
153 Local Variables:
154 c-file-style: "linux"
155 c-basic-offset: 4
156 tab-width: 4
157 End:
158 */