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: "Disk space is printed in units of "
31 //usage: IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K("1024")
32 //usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K("512")
35 //usage: "\n -a Show file sizes too"
36 //usage: "\n -L Follow all symlinks"
37 //usage: "\n -H Follow symlinks on command line"
38 //usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
39 //usage: "\n -c Show grand total"
40 //usage: "\n -l Count sizes many times if hard linked"
41 //usage: "\n -s Display only a total for each argument"
42 //usage: "\n -x Skip directories on different filesystems"
43 //usage: IF_FEATURE_HUMAN_READABLE(
44 //usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G )"
45 //usage: "\n -m Sizes in megabytes"
47 //usage: "\n -k Sizes in kilobytes"
48 //usage: IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
50 //usage:#define du_example_usage
53 //usage: "12 ./kernel-patches/CVS\n"
54 //usage: "80 ./kernel-patches\n"
55 //usage: "12 ./tests/CVS\n"
56 //usage: "36 ./tests\n"
57 //usage: "12 ./scripts/CVS\n"
58 //usage: "16 ./scripts\n"
59 //usage: "12 ./docs/CVS\n"
60 //usage: "104 ./docs\n"
66 OPT_a_files_too = (1 << 0),
67 OPT_H_follow_links = (1 << 1),
68 OPT_k_kbytes = (1 << 2),
69 OPT_L_follow_links = (1 << 3),
70 OPT_s_total_norecurse = (1 << 4),
71 OPT_x_one_FS = (1 << 5),
72 OPT_d_maxdepth = (1 << 6),
73 OPT_l_hardlinks = (1 << 7),
74 OPT_c_total = (1 << 8),
75 OPT_h_for_humans = (1 << 9),
76 OPT_m_mbytes = (1 << 10),
80 #if ENABLE_FEATURE_HUMAN_READABLE
81 unsigned long disp_hr;
91 #define G (*(struct globals*)&bb_common_bufsiz1)
94 static void print(unsigned long size, const char *filename)
96 /* TODO - May not want to defer error checking here. */
97 #if ENABLE_FEATURE_HUMAN_READABLE
99 /* size x 512 / G.disp_hr, show one fractional,
100 * use suffixes if G.disp_hr == 0 */
101 make_human_readable_str(size, 512, G.disp_hr),
108 printf("%lu\t%s\n", size, filename);
112 /* tiny recursive du */
113 static unsigned long du(const char *filename)
118 if (lstat(filename, &statbuf) != 0) {
119 bb_simple_perror_msg(filename);
120 G.status = EXIT_FAILURE;
124 if (option_mask32 & OPT_x_one_FS) {
125 if (G.du_depth == 0) {
126 G.dir_dev = statbuf.st_dev;
127 } else if (G.dir_dev != statbuf.st_dev) {
132 sum = statbuf.st_blocks;
134 if (S_ISLNK(statbuf.st_mode)) {
135 if (G.slink_depth > G.du_depth) { /* -H or -L */
136 if (stat(filename, &statbuf) != 0) {
137 bb_simple_perror_msg(filename);
138 G.status = EXIT_FAILURE;
141 sum = statbuf.st_blocks;
142 if (G.slink_depth == 1) {
143 /* Convert -H to -L */
144 G.slink_depth = INT_MAX;
149 if (!(option_mask32 & OPT_l_hardlinks)
150 && statbuf.st_nlink > 1
152 /* Add files/directories with links only once */
153 if (is_in_ino_dev_hashtable(&statbuf)) {
156 add_to_ino_dev_hashtable(&statbuf, NULL);
159 if (S_ISDIR(statbuf.st_mode)) {
161 struct dirent *entry;
164 dir = warn_opendir(filename);
166 G.status = EXIT_FAILURE;
170 while ((entry = readdir(dir))) {
171 newfile = concat_subpath_file(filename, entry->d_name);
181 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
184 if (G.du_depth <= G.max_print_depth) {
185 print(sum, filename);
190 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
191 int du_main(int argc UNUSED_PARAM, char **argv)
194 int slink_depth_save;
197 #if ENABLE_FEATURE_HUMAN_READABLE
198 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
199 IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
200 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
203 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
204 /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
206 G.max_print_depth = INT_MAX;
208 /* Note: SUSv3 specifies that -a and -s options cannot be used together
209 * in strictly conforming applications. However, it also says that some
210 * du implementations may produce output when -a and -s are used together.
211 * gnu du exits with an error code in this case. We choose to simply
212 * ignore -a. This is consistent with -s being equivalent to -d 0.
214 #if ENABLE_FEATURE_HUMAN_READABLE
215 opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
216 opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
218 if (opt & OPT_h_for_humans) {
221 if (opt & OPT_m_mbytes) {
222 G.disp_hr = 1024*1024;
224 if (opt & OPT_k_kbytes) {
228 opt_complementary = "H-L:L-H:s-d:d-s:d+";
229 opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
231 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
232 if (opt & OPT_k_kbytes) {
237 if (opt & OPT_H_follow_links) {
240 if (opt & OPT_L_follow_links) {
241 G.slink_depth = INT_MAX;
243 if (opt & OPT_s_total_norecurse) {
244 G.max_print_depth = 0;
247 /* go through remaining args (if any) */
249 *--argv = (char*)".";
250 if (G.slink_depth == 1) {
255 slink_depth_save = G.slink_depth;
259 /* otherwise du /dir /dir won't show /dir twice: */
260 reset_ino_dev_hashtable();
261 G.slink_depth = slink_depth_save;
264 if (opt & OPT_c_total)
265 print(total, "total");
267 fflush_stdout_and_exit(G.status);