busybox/coreutils/du.c

/* 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 tarball for details.
 */

/* 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.
 */

#include "libbb.h"

struct globals {
#if ENABLE_FEATURE_HUMAN_READABLE
	unsigned long disp_hr;
#else
	unsigned disp_k;
#endif

	int max_print_depth;
	nlink_t count_hardlinks;

	bool status;
	bool one_file_system;
	int print_files;
	int slink_depth;
	int du_depth;
	dev_t dir_dev;
};
#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", make_human_readable_str(size, 512, G.disp_hr),
			filename);
#else
	if (G.disp_k) {
		size++;
		size >>= 1;
	}
	printf("%ld\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 (G.one_file_system) {
		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) {
				G.slink_depth = INT_MAX;	/* Convert -H to -L. */
			}
		}
	}

	if (statbuf.st_nlink > G.count_hardlinks) {
		/* 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;
		}

		newfile = last_char_is(filename, '/');
		if (newfile)
			*newfile = '\0';

		while ((entry = readdir(dir))) {
			char *name = entry->d_name;

			newfile = concat_subpath_file(filename, name);
			if (newfile == NULL)
				continue;
			++G.du_depth;
			sum += du(newfile);
			--G.du_depth;
			free(newfile);
		}
		closedir(dir);
	} else if (G.du_depth > G.print_files) {
		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;
	bool print_final_total;
	unsigned opt;

#if ENABLE_FEATURE_HUMAN_READABLE
	USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
	SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
	if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
		G.disp_hr = 512;
#else
	USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
	/* SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
#endif
	G.max_print_depth = INT_MAX;
	G.count_hardlinks = 1;

	/* 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 & (1 << 9)) {
		/* -h opt */
		G.disp_hr = 0;
	}
	if (opt & (1 << 10)) {
		/* -m opt */
		G.disp_hr = 1024*1024;
	}
	if (opt & (1 << 2)) {
		/* -k opt */
		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 & (1 << 2)) {
		/* -k opt */
		G.disp_k = 1;
	}
#endif
#endif
	if (opt & (1 << 0)) {
		/* -a opt */
		G.print_files = INT_MAX;
	}
	if (opt & (1 << 1)) {
		/* -H opt */
		G.slink_depth = 1;
	}
	if (opt & (1 << 3)) {
		/* -L opt */
		G.slink_depth = INT_MAX;
	}
	if (opt & (1 << 4)) {
		/* -s opt */
		G.max_print_depth = 0;
	}
	G.one_file_system = opt & (1 << 5); /* -x opt */
	if (opt & (1 << 7)) {
		/* -l opt */
		G.count_hardlinks = MAXINT(nlink_t);
	}
	print_final_total = opt & (1 << 8); /* -c opt */

	/* 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);
		G.slink_depth = slink_depth_save;
	} while (*++argv);

	if (ENABLE_FEATURE_CLEAN_UP)
		reset_ino_dev_hashtable();
	if (print_final_total)
		print(total, "total");

	fflush_stdout_and_exit(G.status);
}
1	niro	532	/* 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 tarball for details.
10			*/
11
12			/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
13			/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
14
15			/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
16			*
17			* Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
18			* 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
19			* The -d option allows setting of max depth (similar to gnu --max-depth).
20			* 2) Fixed incorrect size calculations for links and directories, especially
21			* when errors occurred. Calculates sizes should now match gnu du output.
22			* 3) Added error checking of output.
23			* 4) Fixed busybox bug #1284 involving long overflow with human_readable.
24			*/
25
26	niro	816	#include "libbb.h"
27	niro	532
28	niro	816	struct globals {
29	niro	532	#if ENABLE_FEATURE_HUMAN_READABLE
30	niro	816	unsigned long disp_hr;
31	niro	532	#else
32	niro	816	unsigned disp_k;
33	niro	532	#endif
34
35	niro	816	int max_print_depth;
36			nlink_t count_hardlinks;
37	niro	532
38	niro	816	bool status;
39			bool one_file_system;
40			int print_files;
41			int slink_depth;
42			int du_depth;
43			dev_t dir_dev;
44			};
45			#define G ((struct globals)&bb_common_bufsiz1)
46	niro	532
47
48	niro	816	static void print(unsigned long size, const char *filename)
49	niro	532	{
50			/* TODO - May not want to defer error checking here. */
51			#if ENABLE_FEATURE_HUMAN_READABLE
52	niro	816	printf("%s\t%s\n", make_human_readable_str(size, 512, G.disp_hr),
53	niro	532	filename);
54			#else
55	niro	816	if (G.disp_k) {
56	niro	532	size++;
57			size >>= 1;
58			}
59			printf("%ld\t%s\n", size, filename);
60			#endif
61			}
62
63			/* tiny recursive du */
64	niro	816	static unsigned long du(const char *filename)
65	niro	532	{
66			struct stat statbuf;
67	niro	816	unsigned long sum;
68	niro	532
69			if (lstat(filename, &statbuf) != 0) {
70	niro	816	bb_simple_perror_msg(filename);
71			G.status = EXIT_FAILURE;
72	niro	532	return 0;
73			}
74
75	niro	816	if (G.one_file_system) {
76			if (G.du_depth == 0) {
77			G.dir_dev = statbuf.st_dev;
78			} else if (G.dir_dev != statbuf.st_dev) {
79	niro	532	return 0;
80			}
81			}
82
83			sum = statbuf.st_blocks;
84
85			if (S_ISLNK(statbuf.st_mode)) {
86	niro	816	if (G.slink_depth > G.du_depth) { /* -H or -L */
87	niro	532	if (stat(filename, &statbuf) != 0) {
88	niro	816	bb_simple_perror_msg(filename);
89			G.status = EXIT_FAILURE;
90	niro	532	return 0;
91			}
92			sum = statbuf.st_blocks;
93	niro	816	if (G.slink_depth == 1) {
94			G.slink_depth = INT_MAX; /* Convert -H to -L. */
95	niro	532	}
96			}
97			}
98
99	niro	816	if (statbuf.st_nlink > G.count_hardlinks) {
100	niro	532	/* Add files/directories with links only once */
101	niro	816	if (is_in_ino_dev_hashtable(&statbuf)) {
102	niro	532	return 0;
103			}
104			add_to_ino_dev_hashtable(&statbuf, NULL);
105			}
106
107			if (S_ISDIR(statbuf.st_mode)) {
108			DIR *dir;
109			struct dirent *entry;
110			char *newfile;
111
112			dir = warn_opendir(filename);
113			if (!dir) {
114	niro	816	G.status = EXIT_FAILURE;
115	niro	532	return sum;
116			}
117
118			newfile = last_char_is(filename, '/');
119			if (newfile)
120			*newfile = '\0';
121
122			while ((entry = readdir(dir))) {
123			char *name = entry->d_name;
124
125			newfile = concat_subpath_file(filename, name);
126			if (newfile == NULL)
127			continue;
128	niro	816	++G.du_depth;
129	niro	532	sum += du(newfile);
130	niro	816	--G.du_depth;
131	niro	532	free(newfile);
132			}
133			closedir(dir);
134	niro	816	} else if (G.du_depth > G.print_files) {
135	niro	532	return sum;
136			}
137	niro	816	if (G.du_depth <= G.max_print_depth) {
138	niro	532	print(sum, filename);
139			}
140			return sum;
141			}
142
143	niro	816	int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
144			int du_main(int argc UNUSED_PARAM, char **argv)
145	niro	532	{
146	niro	816	unsigned long total;
147	niro	532	int slink_depth_save;
148	niro	816	bool print_final_total;
149	niro	532	unsigned opt;
150
151			#if ENABLE_FEATURE_HUMAN_READABLE
152	niro	816	USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
153			SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
154			if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
155			G.disp_hr = 512;
156	niro	532	#else
157	niro	816	USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
158			/* SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
159	niro	532	#endif
160	niro	816	G.max_print_depth = INT_MAX;
161			G.count_hardlinks = 1;
162	niro	532
163			/* Note: SUSv3 specifies that -a and -s options cannot be used together
164			* in strictly conforming applications. However, it also says that some
165			* du implementations may produce output when -a and -s are used together.
166			* gnu du exits with an error code in this case. We choose to simply
167			* ignore -a. This is consistent with -s being equivalent to -d 0.
168			*/
169			#if ENABLE_FEATURE_HUMAN_READABLE
170	niro	816	opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
171			opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
172			argv += optind;
173	niro	532	if (opt & (1 << 9)) {
174			/* -h opt */
175	niro	816	G.disp_hr = 0;
176	niro	532	}
177			if (opt & (1 << 10)) {
178			/* -m opt */
179	niro	816	G.disp_hr = 1024*1024;
180	niro	532	}
181			if (opt & (1 << 2)) {
182			/* -k opt */
183	niro	816	G.disp_hr = 1024;
184	niro	532	}
185			#else
186	niro	816	opt_complementary = "H-L:L-H:s-d:d-s:d+";
187			opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
188			argv += optind;
189	niro	532	#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
190			if (opt & (1 << 2)) {
191			/* -k opt */
192	niro	816	G.disp_k = 1;
193	niro	532	}
194			#endif
195			#endif
196			if (opt & (1 << 0)) {
197			/* -a opt */
198	niro	816	G.print_files = INT_MAX;
199	niro	532	}
200			if (opt & (1 << 1)) {
201			/* -H opt */
202	niro	816	G.slink_depth = 1;
203	niro	532	}
204			if (opt & (1 << 3)) {
205			/* -L opt */
206	niro	816	G.slink_depth = INT_MAX;
207	niro	532	}
208			if (opt & (1 << 4)) {
209			/* -s opt */
210	niro	816	G.max_print_depth = 0;
211	niro	532	}
212	niro	816	G.one_file_system = opt & (1 << 5); /* -x opt */
213	niro	532	if (opt & (1 << 7)) {
214			/* -l opt */
215	niro	816	G.count_hardlinks = MAXINT(nlink_t);
216	niro	532	}
217			print_final_total = opt & (1 << 8); /* -c opt */
218
219			/* go through remaining args (if any) */
220	niro	816	if (!*argv) {
221			--argv = (char)".";
222			if (G.slink_depth == 1) {
223			G.slink_depth = 0;
224	niro	532	}
225			}
226
227	niro	816	slink_depth_save = G.slink_depth;
228	niro	532	total = 0;
229			do {
230			total += du(*argv);
231	niro	816	G.slink_depth = slink_depth_save;
232	niro	532	} while (*++argv);
233
234	niro	816	if (ENABLE_FEATURE_CLEAN_UP)
235			reset_ino_dev_hashtable();
236			if (print_final_total)
237	niro	532	print(total, "total");
238
239	niro	816	fflush_stdout_and_exit(G.status);
240	niro	532	}