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 (6.3 kb)"
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 default blocksize of 1024 bytes (else it's 512 bytes)"
31 //config: depends on DU
33 //applet:IF_DU(APPLET(du, BB_DIR_USR_BIN, BB_SUID_DROP))
35 //kbuild:lib-$(CONFIG_DU) += du.o
37 /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
38 /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
40 //usage:#define du_trivial_usage
41 //usage: "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
42 //usage:#define du_full_usage "\n\n"
43 //usage: "Summarize disk space used for each FILE and/or directory\n"
44 //usage: "\n -a Show file sizes too"
45 //usage: "\n -L Follow all symlinks"
46 //usage: "\n -H Follow symlinks on command line"
47 //usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
48 //usage: "\n -c Show grand total"
49 //usage: "\n -l Count sizes many times if hard linked"
50 //usage: "\n -s Display only a total for each argument"
51 //usage: "\n -x Skip directories on different filesystems"
52 //usage: IF_FEATURE_HUMAN_READABLE(
53 //usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G)"
54 //usage: "\n -m Sizes in megabytes"
56 //usage: "\n -k Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
57 //usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
58 //usage: "\n Default unit is 512 bytes"
61 //usage:#define du_example_usage
64 //usage: "12 ./kernel-patches/CVS\n"
65 //usage: "80 ./kernel-patches\n"
66 //usage: "12 ./tests/CVS\n"
67 //usage: "36 ./tests\n"
68 //usage: "12 ./scripts/CVS\n"
69 //usage: "16 ./scripts\n"
70 //usage: "12 ./docs/CVS\n"
71 //usage: "104 ./docs\n"
75 #include "common_bufsiz.h"
78 OPT_a_files_too = (1 << 0),
79 OPT_H_follow_links = (1 << 1),
80 OPT_k_kbytes = (1 << 2),
81 OPT_L_follow_links = (1 << 3),
82 OPT_s_total_norecurse = (1 << 4),
83 OPT_x_one_FS = (1 << 5),
84 OPT_d_maxdepth = (1 << 6),
85 OPT_l_hardlinks = (1 << 7),
86 OPT_c_total = (1 << 8),
87 OPT_h_for_humans = (1 << 9),
88 OPT_m_mbytes = (1 << 10),
92 #if ENABLE_FEATURE_HUMAN_READABLE
93 unsigned long disp_unit;
103 #define G (*(struct globals*)bb_common_bufsiz1)
104 #define INIT_G() do { setup_common_bufsiz(); } while (0)
107 static void print(unsigned long long size, const char *filename)
109 /* TODO - May not want to defer error checking here. */
110 #if ENABLE_FEATURE_HUMAN_READABLE
112 /* ~30 bytes of code for extra comtat:
113 * coreutils' du rounds sizes up:
114 * for example, 1025k file is shown as "2" by du -m.
115 * We round to nearest if human-readable [too hard to fix],
116 * else (fixed scale such as -m), we round up. To that end,
117 * add yet another half of the unit before displaying:
120 size += (G.disp_unit-1) / (unsigned)(512 * 2);
123 /* size x 512 / G.disp_unit.
124 * If G.disp_unit == 0, show one fractional
127 make_human_readable_str(size, 512, G.disp_unit),
134 printf("%llu\t%s\n", size, filename);
138 /* tiny recursive du */
139 static unsigned long long du(const char *filename)
142 unsigned long long sum;
144 if (lstat(filename, &statbuf) != 0) {
145 bb_simple_perror_msg(filename);
146 G.status = EXIT_FAILURE;
150 if (option_mask32 & OPT_x_one_FS) {
151 if (G.du_depth == 0) {
152 G.dir_dev = statbuf.st_dev;
153 } else if (G.dir_dev != statbuf.st_dev) {
158 sum = statbuf.st_blocks;
160 if (S_ISLNK(statbuf.st_mode)) {
161 if (G.slink_depth > G.du_depth) { /* -H or -L */
162 if (stat(filename, &statbuf) != 0) {
163 bb_simple_perror_msg(filename);
164 G.status = EXIT_FAILURE;
167 sum = statbuf.st_blocks;
168 if (G.slink_depth == 1) {
169 /* Convert -H to -L */
170 G.slink_depth = INT_MAX;
175 if (!(option_mask32 & OPT_l_hardlinks)
176 && statbuf.st_nlink > 1
178 /* Add files/directories with links only once */
179 if (is_in_ino_dev_hashtable(&statbuf)) {
182 add_to_ino_dev_hashtable(&statbuf, NULL);
185 if (S_ISDIR(statbuf.st_mode)) {
187 struct dirent *entry;
190 dir = warn_opendir(filename);
192 G.status = EXIT_FAILURE;
196 while ((entry = readdir(dir))) {
197 newfile = concat_subpath_file(filename, entry->d_name);
207 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
210 if (G.du_depth <= G.max_print_depth) {
211 print(sum, filename);
216 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
217 int du_main(int argc UNUSED_PARAM, char **argv)
219 unsigned long long total;
220 int slink_depth_save;
225 #if ENABLE_FEATURE_HUMAN_READABLE
226 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 1024;)
227 IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 512;)
228 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
231 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
232 /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
234 G.max_print_depth = INT_MAX;
236 /* Note: SUSv3 specifies that -a and -s options cannot be used together
237 * in strictly conforming applications. However, it also says that some
238 * du implementations may produce output when -a and -s are used together.
239 * gnu du exits with an error code in this case. We choose to simply
240 * ignore -a. This is consistent with -s being equivalent to -d 0.
242 #if ENABLE_FEATURE_HUMAN_READABLE
243 opt = getopt32(argv, "^"
245 "\0" "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s",
249 if (opt & OPT_h_for_humans) {
252 if (opt & OPT_m_mbytes) {
253 G.disp_unit = 1024*1024;
255 if (opt & OPT_k_kbytes) {
259 opt = getopt32(argv, "^"
261 "\0" "H-L:L-H:s-d:d-s",
265 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
266 if (opt & OPT_k_kbytes) {
271 if (opt & OPT_H_follow_links) {
274 if (opt & OPT_L_follow_links) {
275 G.slink_depth = INT_MAX;
277 if (opt & OPT_s_total_norecurse) {
278 G.max_print_depth = 0;
281 /* go through remaining args (if any) */
283 *--argv = (char*)".";
284 if (G.slink_depth == 1) {
289 slink_depth_save = G.slink_depth;
293 G.slink_depth = slink_depth_save;
296 if (ENABLE_FEATURE_CLEAN_UP)
297 reset_ino_dev_hashtable();
298 if (opt & OPT_c_total)
299 print(total, "total");
301 fflush_stdout_and_exit(G.status);