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"

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;
};
#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);
}
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	984	enum {
29			OPT_a_files_too = (1 << 0),
30			OPT_H_follow_links = (1 << 1),
31			OPT_k_kbytes = (1 << 2),
32			OPT_L_follow_links = (1 << 3),
33			OPT_s_total_norecurse = (1 << 4),
34			OPT_x_one_FS = (1 << 5),
35			OPT_d_maxdepth = (1 << 6),
36			OPT_l_hardlinks = (1 << 7),
37			OPT_c_total = (1 << 8),
38			OPT_h_for_humans = (1 << 9),
39			OPT_m_mbytes = (1 << 10),
40			};
41
42	niro	816	struct globals {
43	niro	532	#if ENABLE_FEATURE_HUMAN_READABLE
44	niro	816	unsigned long disp_hr;
45	niro	532	#else
46	niro	816	unsigned disp_k;
47	niro	532	#endif
48	niro	816	int max_print_depth;
49			bool status;
50			int slink_depth;
51			int du_depth;
52			dev_t dir_dev;
53			};
54			#define G ((struct globals)&bb_common_bufsiz1)
55	niro	532
56
57	niro	816	static void print(unsigned long size, const char *filename)
58	niro	532	{
59			/* TODO - May not want to defer error checking here. */
60			#if ENABLE_FEATURE_HUMAN_READABLE
61	niro	984	printf("%s\t%s\n",
62			/* size x 512 / G.disp_hr, show one fractional,
63			* use suffixes if G.disp_hr == 0 */
64			make_human_readable_str(size, 512, G.disp_hr),
65	niro	532	filename);
66			#else
67	niro	816	if (G.disp_k) {
68	niro	532	size++;
69			size >>= 1;
70			}
71	niro	984	printf("%lu\t%s\n", size, filename);
72	niro	532	#endif
73			}
74
75			/* tiny recursive du */
76	niro	816	static unsigned long du(const char *filename)
77	niro	532	{
78			struct stat statbuf;
79	niro	816	unsigned long sum;
80	niro	532
81			if (lstat(filename, &statbuf) != 0) {
82	niro	816	bb_simple_perror_msg(filename);
83			G.status = EXIT_FAILURE;
84	niro	532	return 0;
85			}
86
87	niro	984	if (option_mask32 & OPT_x_one_FS) {
88	niro	816	if (G.du_depth == 0) {
89			G.dir_dev = statbuf.st_dev;
90			} else if (G.dir_dev != statbuf.st_dev) {
91	niro	532	return 0;
92			}
93			}
94
95			sum = statbuf.st_blocks;
96
97			if (S_ISLNK(statbuf.st_mode)) {
98	niro	984	if (G.slink_depth > G.du_depth) { /* -H or -L */
99	niro	532	if (stat(filename, &statbuf) != 0) {
100	niro	816	bb_simple_perror_msg(filename);
101			G.status = EXIT_FAILURE;
102	niro	532	return 0;
103			}
104			sum = statbuf.st_blocks;
105	niro	816	if (G.slink_depth == 1) {
106	niro	984	/* Convert -H to -L */
107			G.slink_depth = INT_MAX;
108	niro	532	}
109			}
110			}
111
112	niro	984	if (!(option_mask32 & OPT_l_hardlinks)
113			&& statbuf.st_nlink > 1
114			) {
115	niro	532	/* Add files/directories with links only once */
116	niro	816	if (is_in_ino_dev_hashtable(&statbuf)) {
117	niro	532	return 0;
118			}
119			add_to_ino_dev_hashtable(&statbuf, NULL);
120			}
121
122			if (S_ISDIR(statbuf.st_mode)) {
123			DIR *dir;
124			struct dirent *entry;
125			char *newfile;
126
127			dir = warn_opendir(filename);
128			if (!dir) {
129	niro	816	G.status = EXIT_FAILURE;
130	niro	532	return sum;
131			}
132
133			while ((entry = readdir(dir))) {
134	niro	984	newfile = concat_subpath_file(filename, entry->d_name);
135	niro	532	if (newfile == NULL)
136			continue;
137	niro	816	++G.du_depth;
138	niro	532	sum += du(newfile);
139	niro	816	--G.du_depth;
140	niro	532	free(newfile);
141			}
142			closedir(dir);
143	niro	984	} else {
144			if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
145			return sum;
146	niro	532	}
147	niro	816	if (G.du_depth <= G.max_print_depth) {
148	niro	532	print(sum, filename);
149			}
150			return sum;
151			}
152
153	niro	816	int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
154			int du_main(int argc UNUSED_PARAM, char **argv)
155	niro	532	{
156	niro	816	unsigned long total;
157	niro	532	int slink_depth_save;
158			unsigned opt;
159
160			#if ENABLE_FEATURE_HUMAN_READABLE
161	niro	984	IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
162			IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
163	niro	816	if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
164			G.disp_hr = 512;
165	niro	532	#else
166	niro	984	IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
167			/* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
168	niro	532	#endif
169	niro	816	G.max_print_depth = INT_MAX;
170	niro	532
171			/* Note: SUSv3 specifies that -a and -s options cannot be used together
172			* in strictly conforming applications. However, it also says that some
173			* du implementations may produce output when -a and -s are used together.
174			* gnu du exits with an error code in this case. We choose to simply
175			* ignore -a. This is consistent with -s being equivalent to -d 0.
176			*/
177			#if ENABLE_FEATURE_HUMAN_READABLE
178	niro	816	opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
179			opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
180			argv += optind;
181	niro	984	if (opt & OPT_h_for_humans) {
182	niro	816	G.disp_hr = 0;
183	niro	532	}
184	niro	984	if (opt & OPT_m_mbytes) {
185	niro	816	G.disp_hr = 1024*1024;
186	niro	532	}
187	niro	984	if (opt & OPT_k_kbytes) {
188	niro	816	G.disp_hr = 1024;
189	niro	532	}
190			#else
191	niro	816	opt_complementary = "H-L:L-H:s-d:d-s:d+";
192			opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
193			argv += optind;
194	niro	532	#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
195	niro	984	if (opt & OPT_k_kbytes) {
196	niro	816	G.disp_k = 1;
197	niro	532	}
198			#endif
199			#endif
200	niro	984	if (opt & OPT_H_follow_links) {
201	niro	816	G.slink_depth = 1;
202	niro	532	}
203	niro	984	if (opt & OPT_L_follow_links) {
204	niro	816	G.slink_depth = INT_MAX;
205	niro	532	}
206	niro	984	if (opt & OPT_s_total_norecurse) {
207	niro	816	G.max_print_depth = 0;
208	niro	532	}
209
210			/* go through remaining args (if any) */
211	niro	816	if (!*argv) {
212			--argv = (char)".";
213			if (G.slink_depth == 1) {
214			G.slink_depth = 0;
215	niro	532	}
216			}
217
218	niro	816	slink_depth_save = G.slink_depth;
219	niro	532	total = 0;
220			do {
221			total += du(*argv);
222	niro	984	/* otherwise du /dir /dir won't show /dir twice: */
223			reset_ino_dev_hashtable();
224	niro	816	G.slink_depth = slink_depth_save;
225	niro	532	} while (*++argv);
226
227	niro	984	if (opt & OPT_c_total)
228	niro	532	print(total, "total");
229
230	niro	816	fflush_stdout_and_exit(G.status);
231	niro	532	}