summaryrefslogtreecommitdiff
path: root/coreutils/du.c
blob: b8bbe3d9ef10d0550d31fb349da01065e7718d15 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/* vi: set sw=4 ts=4: */
/*
 * Mini du implementation for busybox
 *
 * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
 * Copyright (C) 2002  Edward Betts <edward@debian.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
 * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
 *    The -d option allows setting of max depth (similar to gnu --max-depth).
 * 2) Fixed incorrect size calculations for links and directories, especially
 *    when errors occurred.  Calculates sizes should now match gnu du output.
 * 3) Added error checking of output.
 * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
 */

//usage:#define du_trivial_usage
//usage:       "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
//usage:#define du_full_usage "\n\n"
//usage:       "Summarize disk space used for each FILE and/or directory.\n"
//usage:       "Disk space is printed in units of "
//usage:	IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K("1024")
//usage:	IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K("512")
//usage:       " bytes.\n"
//usage:     "\n	-a	Show file sizes too"
//usage:     "\n	-L	Follow all symlinks"
//usage:     "\n	-H	Follow symlinks on command line"
//usage:     "\n	-d N	Limit output to directories (and files with -a) of depth < N"
//usage:     "\n	-c	Show grand total"
//usage:     "\n	-l	Count sizes many times if hard linked"
//usage:     "\n	-s	Display only a total for each argument"
//usage:     "\n	-x	Skip directories on different filesystems"
//usage:	IF_FEATURE_HUMAN_READABLE(
//usage:     "\n	-h	Sizes in human readable format (e.g., 1K 243M 2G )"
//usage:     "\n	-m	Sizes in megabytes"
//usage:	)
//usage:     "\n	-k	Sizes in kilobytes"
//usage:			IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
//usage:
//usage:#define du_example_usage
//usage:       "$ du\n"
//usage:       "16      ./CVS\n"
//usage:       "12      ./kernel-patches/CVS\n"
//usage:       "80      ./kernel-patches\n"
//usage:       "12      ./tests/CVS\n"
//usage:       "36      ./tests\n"
//usage:       "12      ./scripts/CVS\n"
//usage:       "16      ./scripts\n"
//usage:       "12      ./docs/CVS\n"
//usage:       "104     ./docs\n"
//usage:       "2417    .\n"

#include "libbb.h"

enum {
	OPT_a_files_too    = (1 << 0),
	OPT_H_follow_links = (1 << 1),
	OPT_k_kbytes       = (1 << 2),
	OPT_L_follow_links = (1 << 3),
	OPT_s_total_norecurse = (1 << 4),
	OPT_x_one_FS       = (1 << 5),
	OPT_d_maxdepth     = (1 << 6),
	OPT_l_hardlinks    = (1 << 7),
	OPT_c_total        = (1 << 8),
	OPT_h_for_humans   = (1 << 9),
	OPT_m_mbytes       = (1 << 10),
};

struct globals {
#if ENABLE_FEATURE_HUMAN_READABLE
	unsigned long disp_hr;
#else
	unsigned disp_k;
#endif
	int max_print_depth;
	bool status;
	int slink_depth;
	int du_depth;
	dev_t dir_dev;
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)


static void print(unsigned long size, const char *filename)
{
	/* TODO - May not want to defer error checking here. */
#if ENABLE_FEATURE_HUMAN_READABLE
	printf("%s\t%s\n",
			/* size x 512 / G.disp_hr, show one fractional,
			 * use suffixes if G.disp_hr == 0 */
			make_human_readable_str(size, 512, G.disp_hr),
			filename);
#else
	if (G.disp_k) {
		size++;
		size >>= 1;
	}
	printf("%lu\t%s\n", size, filename);
#endif
}

/* tiny recursive du */
static unsigned long du(const char *filename)
{
	struct stat statbuf;
	unsigned long sum;

	if (lstat(filename, &statbuf) != 0) {
		bb_simple_perror_msg(filename);
		G.status = EXIT_FAILURE;
		return 0;
	}

	if (option_mask32 & OPT_x_one_FS) {
		if (G.du_depth == 0) {
			G.dir_dev = statbuf.st_dev;
		} else if (G.dir_dev != statbuf.st_dev) {
			return 0;
		}
	}

	sum = statbuf.st_blocks;

	if (S_ISLNK(statbuf.st_mode)) {
		if (G.slink_depth > G.du_depth) { /* -H or -L */
			if (stat(filename, &statbuf) != 0) {
				bb_simple_perror_msg(filename);
				G.status = EXIT_FAILURE;
				return 0;
			}
			sum = statbuf.st_blocks;
			if (G.slink_depth == 1) {
				/* Convert -H to -L */
				G.slink_depth = INT_MAX;
			}
		}
	}

	if (!(option_mask32 & OPT_l_hardlinks)
	 && statbuf.st_nlink > 1
	) {
		/* Add files/directories with links only once */
		if (is_in_ino_dev_hashtable(&statbuf)) {
			return 0;
		}
		add_to_ino_dev_hashtable(&statbuf, NULL);
	}

	if (S_ISDIR(statbuf.st_mode)) {
		DIR *dir;
		struct dirent *entry;
		char *newfile;

		dir = warn_opendir(filename);
		if (!dir) {
			G.status = EXIT_FAILURE;
			return sum;
		}

		while ((entry = readdir(dir))) {
			newfile = concat_subpath_file(filename, entry->d_name);
			if (newfile == NULL)
				continue;
			++G.du_depth;
			sum += du(newfile);
			--G.du_depth;
			free(newfile);
		}
		closedir(dir);
	} else {
		if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
			return sum;
	}
	if (G.du_depth <= G.max_print_depth) {
		print(sum, filename);
	}
	return sum;
}

int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int du_main(int argc UNUSED_PARAM, char **argv)
{
	unsigned long total;
	int slink_depth_save;
	unsigned opt;

#if ENABLE_FEATURE_HUMAN_READABLE
	IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
	IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
	if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
		G.disp_hr = 512;
#else
	IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
	/* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
#endif
	G.max_print_depth = INT_MAX;

	/* Note: SUSv3 specifies that -a and -s options cannot be used together
	 * in strictly conforming applications.  However, it also says that some
	 * du implementations may produce output when -a and -s are used together.
	 * gnu du exits with an error code in this case.  We choose to simply
	 * ignore -a.  This is consistent with -s being equivalent to -d 0.
	 */
#if ENABLE_FEATURE_HUMAN_READABLE
	opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
	opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
	argv += optind;
	if (opt & OPT_h_for_humans) {
		G.disp_hr = 0;
	}
	if (opt & OPT_m_mbytes) {
		G.disp_hr = 1024*1024;
	}
	if (opt & OPT_k_kbytes) {
		G.disp_hr = 1024;
	}
#else
	opt_complementary = "H-L:L-H:s-d:d-s:d+";
	opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
	argv += optind;
#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
	if (opt & OPT_k_kbytes) {
		G.disp_k = 1;
	}
#endif
#endif
	if (opt & OPT_H_follow_links) {
		G.slink_depth = 1;
	}
	if (opt & OPT_L_follow_links) {
		G.slink_depth = INT_MAX;
	}
	if (opt & OPT_s_total_norecurse) {
		G.max_print_depth = 0;
	}

	/* go through remaining args (if any) */
	if (!*argv) {
		*--argv = (char*)".";
		if (G.slink_depth == 1) {
			G.slink_depth = 0;
		}
	}

	slink_depth_save = G.slink_depth;
	total = 0;
	do {
		total += du(*argv);
		/* otherwise du /dir /dir won't show /dir twice: */
		reset_ino_dev_hashtable();
		G.slink_depth = slink_depth_save;
	} while (*++argv);

	if (opt & OPT_c_total)
		print(total, "total");

	fflush_stdout_and_exit(G.status);
}