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 (6.3 kb)"
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 default blocksize of 1024 bytes (else it's 512 bytes)"
30 //config: default y
31 //config: depends on DU
32
33 //applet:IF_DU(APPLET(du, BB_DIR_USR_BIN, BB_SUID_DROP))
34
35 //kbuild:lib-$(CONFIG_DU) += du.o
36
37 /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
38 /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
39
40 //usage:#define du_trivial_usage
41 //usage: "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
42 //usage:#define du_full_usage "\n\n"
43 //usage: "Summarize disk space used for FILEs (or directories)\n"
44 //usage: "\n -a Show file sizes too"
45 //usage: "\n -b Apparent size (including holes)"
46 //usage: "\n -L Follow all symlinks"
47 //usage: "\n -H Follow symlinks on command line"
48 //usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
49 //usage: "\n -c Show grand total"
50 //usage: "\n -l Count sizes many times if hard linked"
51 //usage: "\n -s Display only a total for each argument"
52 //usage: "\n -x Skip directories on different filesystems"
53 //usage: IF_FEATURE_HUMAN_READABLE(
54 //usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G)"
55 //usage: "\n -m Sizes in megabytes"
56 //usage: )
57 //usage: "\n -k Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
58 //usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
59 //usage: "\n Default unit is 512 bytes"
60 //usage: )
61 //usage:
62 //usage:#define du_example_usage
63 //usage: "$ du\n"
64 //usage: "16 ./CVS\n"
65 //usage: "12 ./kernel-patches/CVS\n"
66 //usage: "80 ./kernel-patches\n"
67 //usage: "12 ./tests/CVS\n"
68 //usage: "36 ./tests\n"
69 //usage: "12 ./scripts/CVS\n"
70 //usage: "16 ./scripts\n"
71 //usage: "12 ./docs/CVS\n"
72 //usage: "104 ./docs\n"
73 //usage: "2417 .\n"
74
75 #include "libbb.h"
76 #include "common_bufsiz.h"
77
78 enum {
79 OPT_a_files_too = (1 << 0),
80 OPT_H_follow_links = (1 << 1),
81 OPT_k_kbytes = (1 << 2),
82 OPT_L_follow_links = (1 << 3),
83 OPT_s_total_norecurse = (1 << 4),
84 OPT_x_one_FS = (1 << 5),
85 OPT_d_maxdepth = (1 << 6),
86 OPT_l_hardlinks = (1 << 7),
87 OPT_c_total = (1 << 8),
88 OPT_b = (1 << 9),
89 OPT_h_for_humans = (1 << 10),
90 OPT_m_mbytes = (1 << 11),
91 };
92
93 struct 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
print(unsigned long long size,const char * filename)109 static 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 compat:
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, (option_mask32 & OPT_b) ? 1 : 512, G.disp_unit),
130 filename);
131 #else
132 if (G.disp_k) {
133 if (!(option_mask32 & OPT_b)) {
134 size++;
135 size >>= 1;
136 } else {
137 size >>= 10;
138 }
139 }
140 printf("%llu\t%s\n", size, filename);
141 #endif
142 }
143
144 /* tiny recursive du */
du(const char * filename)145 static unsigned long long du(const char *filename)
146 {
147 struct stat statbuf;
148 unsigned long long sum;
149
150 if (lstat(filename, &statbuf) != 0) {
151 bb_simple_perror_msg(filename);
152 G.status = EXIT_FAILURE;
153 return 0;
154 }
155
156 if (option_mask32 & OPT_x_one_FS) {
157 if (G.du_depth == 0) {
158 G.dir_dev = statbuf.st_dev;
159 } else if (G.dir_dev != statbuf.st_dev) {
160 return 0;
161 }
162 }
163
164 sum = ((option_mask32 & OPT_b) ? statbuf.st_size : statbuf.st_blocks);
165
166 if (S_ISLNK(statbuf.st_mode)) {
167 if (G.slink_depth > G.du_depth) { /* -H or -L */
168 if (stat(filename, &statbuf) != 0) {
169 bb_simple_perror_msg(filename);
170 G.status = EXIT_FAILURE;
171 return 0;
172 }
173 sum = ((option_mask32 & OPT_b) ? statbuf.st_size : statbuf.st_blocks);
174 if (G.slink_depth == 1) {
175 /* Convert -H to -L */
176 G.slink_depth = INT_MAX;
177 }
178 }
179 }
180
181 if (!(option_mask32 & OPT_l_hardlinks)
182 && statbuf.st_nlink > 1
183 ) {
184 /* Add files/directories with links only once */
185 if (is_in_ino_dev_hashtable(&statbuf)) {
186 return 0;
187 }
188 add_to_ino_dev_hashtable(&statbuf, NULL);
189 }
190
191 if (S_ISDIR(statbuf.st_mode)) {
192 DIR *dir;
193 struct dirent *entry;
194 char *newfile;
195
196 dir = warn_opendir(filename);
197 if (!dir) {
198 G.status = EXIT_FAILURE;
199 return sum;
200 }
201
202 while ((entry = readdir(dir))) {
203 newfile = concat_subpath_file(filename, entry->d_name);
204 if (newfile == NULL)
205 continue;
206 ++G.du_depth;
207 sum += du(newfile);
208 --G.du_depth;
209 free(newfile);
210 }
211 closedir(dir);
212 } else {
213 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
214 return sum;
215 }
216 if (G.du_depth <= G.max_print_depth) {
217 print(sum, filename);
218 }
219 return sum;
220 }
221
222 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
du_main(int argc UNUSED_PARAM,char ** argv)223 int du_main(int argc UNUSED_PARAM, char **argv)
224 {
225 unsigned long long total;
226 int slink_depth_save;
227 unsigned opt;
228
229 INIT_G();
230
231 #if ENABLE_FEATURE_HUMAN_READABLE
232 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 1024;)
233 IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 512;)
234 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
235 G.disp_unit = 512;
236 #else
237 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
238 /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
239 #endif
240 G.max_print_depth = INT_MAX;
241
242 /* Note: SUSv3 specifies that -a and -s options cannot be used together
243 * in strictly conforming applications. However, it also says that some
244 * du implementations may produce output when -a and -s are used together.
245 * gnu du exits with an error code in this case. We choose to simply
246 * ignore -a. This is consistent with -s being equivalent to -d 0.
247 */
248 #if ENABLE_FEATURE_HUMAN_READABLE
249 opt = getopt32(argv, "^"
250 "aHkLsxd:+lcbhm"
251 "\0" "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s",
252 &G.max_print_depth
253 );
254 argv += optind;
255 if (opt & OPT_b) {
256 G.disp_unit = 1;
257 }
258 if (opt & OPT_h_for_humans) {
259 G.disp_unit = 0;
260 }
261 if (opt & OPT_m_mbytes) {
262 G.disp_unit = 1024*1024;
263 }
264 if (opt & OPT_k_kbytes) {
265 G.disp_unit = 1024;
266 }
267 #else
268 opt = getopt32(argv, "^"
269 "aHkLsxd:+lcb"
270 "\0" "H-L:L-H:s-d:d-s",
271 &G.max_print_depth
272 );
273 argv += optind;
274 # if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
275 if (opt & OPT_k_kbytes) {
276 G.disp_k = 1;
277 }
278 # endif
279 #endif
280 if (opt & OPT_H_follow_links) {
281 G.slink_depth = 1;
282 }
283 if (opt & OPT_L_follow_links) {
284 G.slink_depth = INT_MAX;
285 }
286 if (opt & OPT_s_total_norecurse) {
287 G.max_print_depth = 0;
288 }
289
290 /* go through remaining args (if any) */
291 if (!*argv) {
292 *--argv = (char*)".";
293 if (G.slink_depth == 1) {
294 G.slink_depth = 0;
295 }
296 }
297
298 slink_depth_save = G.slink_depth;
299 total = 0;
300 do {
301 total += du(*argv);
302 G.slink_depth = slink_depth_save;
303 } while (*++argv);
304
305 if (ENABLE_FEATURE_CLEAN_UP)
306 reset_ino_dev_hashtable();
307 if (opt & OPT_c_total)
308 print(total, "total");
309
310 fflush_stdout_and_exit(G.status);
311 }
312