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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini du implementation for busybox
4 *
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>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 */
11/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
12 *
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.
20 */
21//config:config DU
22//config: bool "du (default blocksize of 512 bytes)"
23//config: default y
24//config: help
25//config: du is used to report the amount of disk space used
26//config: for specified files.
27//config:
28//config:config FEATURE_DU_DEFAULT_BLOCKSIZE_1K
29//config: bool "Use a default blocksize of 1024 bytes (1K)"
30//config: default y
31//config: depends on DU
32//config: help
33//config: Use a blocksize of (1K) instead of the default 512b.
34
35//applet:IF_DU(APPLET(du, BB_DIR_USR_BIN, BB_SUID_DROP))
36
37//kbuild:lib-$(CONFIG_DU) += du.o
38
39/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
40/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
41
42//usage:#define du_trivial_usage
43//usage: "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
44//usage:#define du_full_usage "\n\n"
45//usage: "Summarize disk space used for each FILE and/or directory\n"
46//usage: "\n -a Show file sizes too"
47//usage: "\n -L Follow all symlinks"
48//usage: "\n -H Follow symlinks on command line"
49//usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
50//usage: "\n -c Show grand total"
51//usage: "\n -l Count sizes many times if hard linked"
52//usage: "\n -s Display only a total for each argument"
53//usage: "\n -x Skip directories on different filesystems"
54//usage: IF_FEATURE_HUMAN_READABLE(
55//usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G)"
56//usage: "\n -m Sizes in megabytes"
57//usage: )
58//usage: "\n -k Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
59//usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
60//usage: "\n Default unit is 512 bytes"
61//usage: )
62//usage:
63//usage:#define du_example_usage
64//usage: "$ du\n"
65//usage: "16 ./CVS\n"
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"
74//usage: "2417 .\n"
75
76#include "libbb.h"
77#include "common_bufsiz.h"
78
79enum {
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),
91};
92
93struct globals {
94#if ENABLE_FEATURE_HUMAN_READABLE
95 unsigned long disp_unit;
96#else
97 unsigned disp_k;
98#endif
99 int max_print_depth;
100 bool status;
101 int slink_depth;
102 int du_depth;
103 dev_t dir_dev;
104} FIX_ALIASING;
105#define G (*(struct globals*)bb_common_bufsiz1)
106#define INIT_G() do { setup_common_bufsiz(); } while (0)
107
108
109static void print(unsigned long long size, const char *filename)
110{
111 /* TODO - May not want to defer error checking here. */
112#if ENABLE_FEATURE_HUMAN_READABLE
113# if ENABLE_DESKTOP
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:
120 */
121 if (G.disp_unit)
122 size += (G.disp_unit-1) / (unsigned)(512 * 2);
123# endif
124 printf("%s\t%s\n",
125 /* size x 512 / G.disp_unit.
126 * If G.disp_unit == 0, show one fractional
127 * and use suffixes
128 */
129 make_human_readable_str(size, 512, G.disp_unit),
130 filename);
131#else
132 if (G.disp_k) {
133 size++;
134 size >>= 1;
135 }
136 printf("%llu\t%s\n", size, filename);
137#endif
138}
139
140/* tiny recursive du */
141static unsigned long long du(const char *filename)
142{
143 struct stat statbuf;
144 unsigned long long sum;
145
146 if (lstat(filename, &statbuf) != 0) {
147 bb_simple_perror_msg(filename);
148 G.status = EXIT_FAILURE;
149 return 0;
150 }
151
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) {
156 return 0;
157 }
158 }
159
160 sum = statbuf.st_blocks;
161
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;
167 return 0;
168 }
169 sum = statbuf.st_blocks;
170 if (G.slink_depth == 1) {
171 /* Convert -H to -L */
172 G.slink_depth = INT_MAX;
173 }
174 }
175 }
176
177 if (!(option_mask32 & OPT_l_hardlinks)
178 && statbuf.st_nlink > 1
179 ) {
180 /* Add files/directories with links only once */
181 if (is_in_ino_dev_hashtable(&statbuf)) {
182 return 0;
183 }
184 add_to_ino_dev_hashtable(&statbuf, NULL);
185 }
186
187 if (S_ISDIR(statbuf.st_mode)) {
188 DIR *dir;
189 struct dirent *entry;
190 char *newfile;
191
192 dir = warn_opendir(filename);
193 if (!dir) {
194 G.status = EXIT_FAILURE;
195 return sum;
196 }
197
198 while ((entry = readdir(dir))) {
199 newfile = concat_subpath_file(filename, entry->d_name);
200 if (newfile == NULL)
201 continue;
202 ++G.du_depth;
203 sum += du(newfile);
204 --G.du_depth;
205 free(newfile);
206 }
207 closedir(dir);
208 } else {
209 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
210 return sum;
211 }
212 if (G.du_depth <= G.max_print_depth) {
213 print(sum, filename);
214 }
215 return sum;
216}
217
218int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
219int du_main(int argc UNUSED_PARAM, char **argv)
220{
221 unsigned long long total;
222 int slink_depth_save;
223 unsigned opt;
224
225 INIT_G();
226
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? */
231 G.disp_unit = 512;
232#else
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 */
235#endif
236 G.max_print_depth = INT_MAX;
237
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.
243 */
244#if ENABLE_FEATURE_HUMAN_READABLE
245 opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
246 opt = getopt32(argv, "aHkLsx" "d:+" "lc" "hm", &G.max_print_depth);
247 argv += optind;
248 if (opt & OPT_h_for_humans) {
249 G.disp_unit = 0;
250 }
251 if (opt & OPT_m_mbytes) {
252 G.disp_unit = 1024*1024;
253 }
254 if (opt & OPT_k_kbytes) {
255 G.disp_unit = 1024;
256 }
257#else
258 opt_complementary = "H-L:L-H:s-d:d-s";
259 opt = getopt32(argv, "aHkLsx" "d:+" "lc", &G.max_print_depth);
260 argv += optind;
261#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
262 if (opt & OPT_k_kbytes) {
263 G.disp_k = 1;
264 }
265#endif
266#endif
267 if (opt & OPT_H_follow_links) {
268 G.slink_depth = 1;
269 }
270 if (opt & OPT_L_follow_links) {
271 G.slink_depth = INT_MAX;
272 }
273 if (opt & OPT_s_total_norecurse) {
274 G.max_print_depth = 0;
275 }
276
277 /* go through remaining args (if any) */
278 if (!*argv) {
279 *--argv = (char*)".";
280 if (G.slink_depth == 1) {
281 G.slink_depth = 0;
282 }
283 }
284
285 slink_depth_save = G.slink_depth;
286 total = 0;
287 do {
288 total += du(*argv);
289 /* otherwise du /dir /dir won't show /dir twice: */
290 reset_ino_dev_hashtable();
291 G.slink_depth = slink_depth_save;
292 } while (*++argv);
293
294 if (opt & OPT_c_total)
295 print(total, "total");
296
297 fflush_stdout_and_exit(G.status);
298}
299
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