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.
11 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
13 * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
14 * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
15 * The -d option allows setting of max depth (similar to gnu --max-depth).
16 * 2) Fixed incorrect size calculations for links and directories, especially
17 * when errors occurred. Calculates sizes should now match gnu du output.
18 * 3) Added error checking of output.
19 * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
22 //config: bool "du (default blocksize of 512 bytes)"
25 //config: du is used to report the amount of disk space used
26 //config: for specified files.
28 //config:config FEATURE_DU_DEFAULT_BLOCKSIZE_1K
29 //config: bool "Use a default blocksize of 1024 bytes (1K)"
31 //config: depends on DU
33 //config: Use a blocksize of (1K) instead of the default 512b.
35 //applet:IF_DU(APPLET(du, BB_DIR_USR_BIN, BB_SUID_DROP))
37 //kbuild:lib-$(CONFIG_DU) += du.o
39 /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
40 /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
42 //usage:#define du_trivial_usage
43 //usage: "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
44 //usage:#define du_full_usage "\n\n"
45 //usage: "Summarize disk space used for each FILE and/or directory\n"
46 //usage: "\n -a Show file sizes too"
47 //usage: "\n -L Follow all symlinks"
48 //usage: "\n -H Follow symlinks on command line"
49 //usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
50 //usage: "\n -c Show grand total"
51 //usage: "\n -l Count sizes many times if hard linked"
52 //usage: "\n -s Display only a total for each argument"
53 //usage: "\n -x Skip directories on different filesystems"
54 //usage: IF_FEATURE_HUMAN_READABLE(
55 //usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G)"
56 //usage: "\n -m Sizes in megabytes"
58 //usage: "\n -k Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
59 //usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
60 //usage: "\n Default unit is 512 bytes"
63 //usage:#define du_example_usage
66 //usage: "12 ./kernel-patches/CVS\n"
67 //usage: "80 ./kernel-patches\n"
68 //usage: "12 ./tests/CVS\n"
69 //usage: "36 ./tests\n"
70 //usage: "12 ./scripts/CVS\n"
71 //usage: "16 ./scripts\n"
72 //usage: "12 ./docs/CVS\n"
73 //usage: "104 ./docs\n"
77 #include "common_bufsiz.h"
80 OPT_a_files_too = (1 << 0),
81 OPT_H_follow_links = (1 << 1),
82 OPT_k_kbytes = (1 << 2),
83 OPT_L_follow_links = (1 << 3),
84 OPT_s_total_norecurse = (1 << 4),
85 OPT_x_one_FS = (1 << 5),
86 OPT_d_maxdepth = (1 << 6),
87 OPT_l_hardlinks = (1 << 7),
88 OPT_c_total = (1 << 8),
89 OPT_h_for_humans = (1 << 9),
90 OPT_m_mbytes = (1 << 10),
94 #if ENABLE_FEATURE_HUMAN_READABLE
95 unsigned long disp_unit;
105 #define G (*(struct globals*)bb_common_bufsiz1)
106 #define INIT_G() do { setup_common_bufsiz(); } while (0)
109 static void print(unsigned long long size, const char *filename)
111 /* TODO - May not want to defer error checking here. */
112 #if ENABLE_FEATURE_HUMAN_READABLE
114 /* ~30 bytes of code for extra comtat:
115 * coreutils' du rounds sizes up:
116 * for example, 1025k file is shown as "2" by du -m.
117 * We round to nearest if human-readable [too hard to fix],
118 * else (fixed scale such as -m), we round up. To that end,
119 * add yet another half of the unit before displaying:
122 size += (G.disp_unit-1) / (unsigned)(512 * 2);
125 /* size x 512 / G.disp_unit.
126 * If G.disp_unit == 0, show one fractional
129 make_human_readable_str(size, 512, G.disp_unit),
136 printf("%llu\t%s\n", size, filename);
140 /* tiny recursive du */
141 static unsigned long long du(const char *filename)
144 unsigned long long sum;
146 if (lstat(filename, &statbuf) != 0) {
147 bb_simple_perror_msg(filename);
148 G.status = EXIT_FAILURE;
152 if (option_mask32 & OPT_x_one_FS) {
153 if (G.du_depth == 0) {
154 G.dir_dev = statbuf.st_dev;
155 } else if (G.dir_dev != statbuf.st_dev) {
160 sum = statbuf.st_blocks;
162 if (S_ISLNK(statbuf.st_mode)) {
163 if (G.slink_depth > G.du_depth) { /* -H or -L */
164 if (stat(filename, &statbuf) != 0) {
165 bb_simple_perror_msg(filename);
166 G.status = EXIT_FAILURE;
169 sum = statbuf.st_blocks;
170 if (G.slink_depth == 1) {
171 /* Convert -H to -L */
172 G.slink_depth = INT_MAX;
177 if (!(option_mask32 & OPT_l_hardlinks)
178 && statbuf.st_nlink > 1
180 /* Add files/directories with links only once */
181 if (is_in_ino_dev_hashtable(&statbuf)) {
184 add_to_ino_dev_hashtable(&statbuf, NULL);
187 if (S_ISDIR(statbuf.st_mode)) {
189 struct dirent *entry;
192 dir = warn_opendir(filename);
194 G.status = EXIT_FAILURE;
198 while ((entry = readdir(dir))) {
199 newfile = concat_subpath_file(filename, entry->d_name);
209 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
212 if (G.du_depth <= G.max_print_depth) {
213 print(sum, filename);
218 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
219 int du_main(int argc UNUSED_PARAM, char **argv)
221 unsigned long long total;
222 int slink_depth_save;
227 #if ENABLE_FEATURE_HUMAN_READABLE
228 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 1024;)
229 IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 512;)
230 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
233 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
234 /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
236 G.max_print_depth = INT_MAX;
238 /* Note: SUSv3 specifies that -a and -s options cannot be used together
239 * in strictly conforming applications. However, it also says that some
240 * du implementations may produce output when -a and -s are used together.
241 * gnu du exits with an error code in this case. We choose to simply
242 * ignore -a. This is consistent with -s being equivalent to -d 0.
244 #if ENABLE_FEATURE_HUMAN_READABLE
245 opt = getopt32(argv, "^"
247 "\0" "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s",
251 if (opt & OPT_h_for_humans) {
254 if (opt & OPT_m_mbytes) {
255 G.disp_unit = 1024*1024;
257 if (opt & OPT_k_kbytes) {
261 opt = getopt32(argv, "^"
263 "\0" "H-L:L-H:s-d:d-s",
267 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
268 if (opt & OPT_k_kbytes) {
273 if (opt & OPT_H_follow_links) {
276 if (opt & OPT_L_follow_links) {
277 G.slink_depth = INT_MAX;
279 if (opt & OPT_s_total_norecurse) {
280 G.max_print_depth = 0;
283 /* go through remaining args (if any) */
285 *--argv = (char*)".";
286 if (G.slink_depth == 1) {
291 slink_depth_save = G.slink_depth;
295 /* otherwise du /dir /dir won't show /dir twice: */
296 reset_ino_dev_hashtable();
297 G.slink_depth = slink_depth_save;
300 if (opt & OPT_c_total)
301 print(total, "total");
303 fflush_stdout_and_exit(G.status);