1 /* vi: set sw=4 ts=4: */
3 * Mini du implementation for busybox
5 * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
7 * Copyright (C) 2002 Edward Betts <edward@debian.org>
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
13 /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
15 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
17 * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
18 * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
19 * The -d option allows setting of max depth (similar to gnu --max-depth).
20 * 2) Fixed incorrect size calculations for links and directories, especially
21 * when errors occurred. Calculates sizes should now match gnu du output.
22 * 3) Added error checking of output.
23 * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
26 //usage:#define du_trivial_usage
27 //usage: "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
28 //usage:#define du_full_usage "\n\n"
29 //usage: "Summarize disk space used for each FILE and/or directory\n"
30 //usage: "\n -a Show file sizes too"
31 //usage: "\n -L Follow all symlinks"
32 //usage: "\n -H Follow symlinks on command line"
33 //usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
34 //usage: "\n -c Show grand total"
35 //usage: "\n -l Count sizes many times if hard linked"
36 //usage: "\n -s Display only a total for each argument"
37 //usage: "\n -x Skip directories on different filesystems"
38 //usage: IF_FEATURE_HUMAN_READABLE(
39 //usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G)"
40 //usage: "\n -m Sizes in megabytes"
42 //usage: "\n -k Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
43 //usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
44 //usage: "\n Default unit is 512 bytes"
47 //usage:#define du_example_usage
50 //usage: "12 ./kernel-patches/CVS\n"
51 //usage: "80 ./kernel-patches\n"
52 //usage: "12 ./tests/CVS\n"
53 //usage: "36 ./tests\n"
54 //usage: "12 ./scripts/CVS\n"
55 //usage: "16 ./scripts\n"
56 //usage: "12 ./docs/CVS\n"
57 //usage: "104 ./docs\n"
63 OPT_a_files_too = (1 << 0),
64 OPT_H_follow_links = (1 << 1),
65 OPT_k_kbytes = (1 << 2),
66 OPT_L_follow_links = (1 << 3),
67 OPT_s_total_norecurse = (1 << 4),
68 OPT_x_one_FS = (1 << 5),
69 OPT_d_maxdepth = (1 << 6),
70 OPT_l_hardlinks = (1 << 7),
71 OPT_c_total = (1 << 8),
72 OPT_h_for_humans = (1 << 9),
73 OPT_m_mbytes = (1 << 10),
77 #if ENABLE_FEATURE_HUMAN_READABLE
78 unsigned long disp_hr;
88 #define G (*(struct globals*)&bb_common_bufsiz1)
89 #define INIT_G() do { } while (0)
92 /* FIXME? coreutils' du rounds sizes up:
93 * for example, 1025k file is shown as "2" by du -m.
94 * We round to nearest.
96 static void print(unsigned long long size, const char *filename)
98 /* TODO - May not want to defer error checking here. */
99 #if ENABLE_FEATURE_HUMAN_READABLE
101 /* size x 512 / G.disp_hr, show one fractional,
102 * use suffixes if G.disp_hr == 0 */
103 make_human_readable_str(size, 512, G.disp_hr),
110 printf("%llu\t%s\n", size, filename);
114 /* tiny recursive du */
115 static unsigned long long du(const char *filename)
118 unsigned long long sum;
120 if (lstat(filename, &statbuf) != 0) {
121 bb_simple_perror_msg(filename);
122 G.status = EXIT_FAILURE;
126 if (option_mask32 & OPT_x_one_FS) {
127 if (G.du_depth == 0) {
128 G.dir_dev = statbuf.st_dev;
129 } else if (G.dir_dev != statbuf.st_dev) {
134 sum = statbuf.st_blocks;
136 if (S_ISLNK(statbuf.st_mode)) {
137 if (G.slink_depth > G.du_depth) { /* -H or -L */
138 if (stat(filename, &statbuf) != 0) {
139 bb_simple_perror_msg(filename);
140 G.status = EXIT_FAILURE;
143 sum = statbuf.st_blocks;
144 if (G.slink_depth == 1) {
145 /* Convert -H to -L */
146 G.slink_depth = INT_MAX;
151 if (!(option_mask32 & OPT_l_hardlinks)
152 && statbuf.st_nlink > 1
154 /* Add files/directories with links only once */
155 if (is_in_ino_dev_hashtable(&statbuf)) {
158 add_to_ino_dev_hashtable(&statbuf, NULL);
161 if (S_ISDIR(statbuf.st_mode)) {
163 struct dirent *entry;
166 dir = warn_opendir(filename);
168 G.status = EXIT_FAILURE;
172 while ((entry = readdir(dir))) {
173 newfile = concat_subpath_file(filename, entry->d_name);
183 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
186 if (G.du_depth <= G.max_print_depth) {
187 print(sum, filename);
192 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
193 int du_main(int argc UNUSED_PARAM, char **argv)
195 unsigned long long total;
196 int slink_depth_save;
201 #if ENABLE_FEATURE_HUMAN_READABLE
202 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
203 IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
204 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
207 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
208 /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
210 G.max_print_depth = INT_MAX;
212 /* Note: SUSv3 specifies that -a and -s options cannot be used together
213 * in strictly conforming applications. However, it also says that some
214 * du implementations may produce output when -a and -s are used together.
215 * gnu du exits with an error code in this case. We choose to simply
216 * ignore -a. This is consistent with -s being equivalent to -d 0.
218 #if ENABLE_FEATURE_HUMAN_READABLE
219 opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
220 opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
222 if (opt & OPT_h_for_humans) {
225 if (opt & OPT_m_mbytes) {
226 G.disp_hr = 1024*1024;
228 if (opt & OPT_k_kbytes) {
232 opt_complementary = "H-L:L-H:s-d:d-s:d+";
233 opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
235 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
236 if (opt & OPT_k_kbytes) {
241 if (opt & OPT_H_follow_links) {
244 if (opt & OPT_L_follow_links) {
245 G.slink_depth = INT_MAX;
247 if (opt & OPT_s_total_norecurse) {
248 G.max_print_depth = 0;
251 /* go through remaining args (if any) */
253 *--argv = (char*)".";
254 if (G.slink_depth == 1) {
259 slink_depth_save = G.slink_depth;
263 /* otherwise du /dir /dir won't show /dir twice: */
264 reset_ino_dev_hashtable();
265 G.slink_depth = slink_depth_save;
268 if (opt & OPT_c_total)
269 print(total, "total");
271 fflush_stdout_and_exit(G.status);