1 /* vi: set sw=4 ts=4: */
3 * Mini df implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 /* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
14 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
16 * Size reduction. Removed floating point dependency. Added error checking
17 * on output. Output stats on 0-sized filesystems if specifically listed on
18 * the command line. Properly round *-blocks, Used, and Available quantities.
20 * Aug 28, 2008 Bernhard Reutner-Fischer
22 * Implement -P and -B; better coreutils compat; cleanup
30 #if !ENABLE_FEATURE_HUMAN_READABLE
31 static unsigned long kscale(unsigned long b, unsigned long bs)
33 return (b * (unsigned long long) bs + 1024/2) / 1024;
37 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
38 int df_main(int argc, char **argv)
40 unsigned long blocks_used;
41 unsigned blocks_percent_used;
42 unsigned long df_disp_hr = 1024;
43 int status = EXIT_SUCCESS;
46 struct mntent *mount_entry;
52 OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
53 OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
54 OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
55 OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
56 OPT_MEGA = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
58 const char *disp_units_hdr = NULL;
61 check_unicode_in_env();
63 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
64 opt_complementary = "k-mB:m-Bk:B-km";
65 #elif ENABLE_FEATURE_HUMAN_READABLE
66 opt_complementary = "k-m:m-k";
68 opt = getopt32(argv, "kP"
69 IF_FEATURE_DF_FANCY("aiB:")
70 IF_FEATURE_HUMAN_READABLE("hm")
71 IF_FEATURE_DF_FANCY(, &chp));
73 df_disp_hr = 1024*1024;
76 df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
78 /* From the manpage of df from coreutils-6.10:
79 Disk space is shown in 1K blocks by default, unless the environment
80 variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
82 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
85 if (opt & OPT_HUMAN) {
87 disp_units_hdr = " Size";
90 disp_units_hdr = " Inodes";
92 if (disp_units_hdr == NULL) {
93 #if ENABLE_FEATURE_HUMAN_READABLE
94 disp_units_hdr = xasprintf("%s-blocks",
95 /* print df_disp_hr, show no fractionals,
96 * use suffixes if OPT_POSIX is set in opt */
97 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
100 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
103 printf("Filesystem %-15sUsed Available %s Mounted on\n",
104 disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
108 if (optind >= argc) {
109 mount_table = setmntent(bb_path_mtab_file, "r");
111 bb_perror_msg_and_die(bb_path_mtab_file);
116 const char *mount_point;
117 #if ENABLE_FEATURE_ASSUME_UNICODE
122 mount_entry = getmntent(mount_table);
124 endmntent(mount_table);
128 mount_point = *argv++;
131 mount_entry = find_mount_point(mount_point, 1);
133 bb_error_msg("%s: can't find mount point", mount_point);
135 status = EXIT_FAILURE;
140 device = mount_entry->mnt_fsname;
141 mount_point = mount_entry->mnt_dir;
143 if (statfs(mount_point, &s) != 0) {
144 bb_simple_perror_msg(mount_point);
148 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
149 if (opt & OPT_INODE) {
150 s.f_blocks = s.f_files;
151 s.f_bavail = s.f_bfree = s.f_ffree;
157 blocks_used = s.f_blocks - s.f_bfree;
158 blocks_percent_used = 0;
159 if (blocks_used + s.f_bavail) {
160 blocks_percent_used = (blocks_used * 100ULL
161 + (blocks_used + s.f_bavail)/2
162 ) / (blocks_used + s.f_bavail);
165 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
166 if (strcmp(device, "rootfs") == 0)
169 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
170 /* ... and also this is the only user of find_block_device */
171 if (strcmp(device, "/dev/root") == 0) {
172 /* Adjusts device to be the real root device,
173 * or leaves device alone if it can't find it */
174 device = find_block_device("/");
181 #if ENABLE_FEATURE_ASSUME_UNICODE
182 dev_len = bb_mbstrlen(device);
184 printf("%s\n%20s", device, "");
186 printf("%s%*s", device, 20 - (int)dev_len, "");
189 if (printf("\n%-20s" + 1, device) > 20)
190 printf("\n%-20s", "");
193 #if ENABLE_FEATURE_HUMAN_READABLE
195 /* f_blocks x f_bsize / df_disp_hr, show one fractional,
196 * use suffixes if df_disp_hr == 0 */
197 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
200 /* EXPR x f_bsize / df_disp_hr, show one fractional,
201 * use suffixes if df_disp_hr == 0 */
202 make_human_readable_str((s.f_blocks - s.f_bfree),
203 s.f_bsize, df_disp_hr));
205 printf("%9s %3u%% %s\n",
206 /* f_bavail x f_bsize / df_disp_hr, show one fractional,
207 * use suffixes if df_disp_hr == 0 */
208 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
209 blocks_percent_used, mount_point);
211 printf(" %9lu %9lu %9lu %3u%% %s\n",
212 kscale(s.f_blocks, s.f_bsize),
213 kscale(s.f_blocks - s.f_bfree, s.f_bsize),
214 kscale(s.f_bavail, s.f_bsize),
215 blocks_percent_used, mount_point);