busybox/coreutils/df.c

/* vi: set sw=4 ts=4: */
/*
 * Mini df implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Size reduction.  Removed floating point dependency.  Added error checking
 * on output.  Output stats on 0-sized filesystems if specifically listed on
 * the command line.  Properly round *-blocks, Used, and Available quantities.
 *
 * Aug 28, 2008      Bernhard Reutner-Fischer
 *
 * Implement -P and -B; better coreutils compat; cleanup
 */

#include <mntent.h>
#include <sys/vfs.h>
#include "libbb.h"
#include "unicode.h"

#if !ENABLE_FEATURE_HUMAN_READABLE
static unsigned long kscale(unsigned long b, unsigned long bs)
{
	return (b * (unsigned long long) bs + 1024/2) / 1024;
}
#endif

int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int df_main(int argc UNUSED_PARAM, char **argv)
{
	unsigned long blocks_used;
	unsigned blocks_percent_used;
	unsigned long df_disp_hr = 1024;
	int status = EXIT_SUCCESS;
	unsigned opt;
	FILE *mount_table;
	struct mntent *mount_entry;
	struct statfs s;

	enum {
		OPT_KILO  = (1 << 0),
		OPT_POSIX = (1 << 1),
		OPT_ALL   = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
		OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
		OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
		OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
		OPT_MEGA  = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
	};
	const char *disp_units_hdr = NULL;
	char *chp;

	init_unicode();

#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
	opt_complementary = "k-mB:m-Bk:B-km";
#elif ENABLE_FEATURE_HUMAN_READABLE
	opt_complementary = "k-m:m-k";
#endif
	opt = getopt32(argv, "kP"
			IF_FEATURE_DF_FANCY("aiB:")
			IF_FEATURE_HUMAN_READABLE("hm")
			IF_FEATURE_DF_FANCY(, &chp));
	if (opt & OPT_MEGA)
		df_disp_hr = 1024*1024;

	if (opt & OPT_BSIZE)
		df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */

	/* From the manpage of df from coreutils-6.10:
	   Disk space is shown in 1K blocks by default, unless the environment
	   variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
	*/
	if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
		df_disp_hr = 512;

	if (opt & OPT_HUMAN) {
		df_disp_hr = 0;
		disp_units_hdr = "     Size";
	}
	if (opt & OPT_INODE)
		disp_units_hdr = "   Inodes";

	if (disp_units_hdr == NULL) {
#if ENABLE_FEATURE_HUMAN_READABLE
		disp_units_hdr = xasprintf("%s-blocks",
			/* print df_disp_hr, show no fractionals,
			 * use suffixes if OPT_POSIX is set in opt */
			make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
		);
#else
		disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
#endif
	}
	printf("Filesystem           %-15sUsed Available %s Mounted on\n",
			disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");

	mount_table = NULL;
	argv += optind;
	if (!argv[0]) {
		mount_table = setmntent(bb_path_mtab_file, "r");
		if (!mount_table)
			bb_perror_msg_and_die(bb_path_mtab_file);
	}

	while (1) {
		const char *device;
		const char *mount_point;
#if ENABLE_FEATURE_ASSUME_UNICODE
		size_t dev_len;
#endif

		if (mount_table) {
			mount_entry = getmntent(mount_table);
			if (!mount_entry) {
				endmntent(mount_table);
				break;
			}
		} else {
			mount_point = *argv++;
			if (!mount_point)
				break;
			mount_entry = find_mount_point(mount_point, 1);
			if (!mount_entry) {
				bb_error_msg("%s: can't find mount point", mount_point);
 set_error:
				status = EXIT_FAILURE;
				continue;
			}
		}

		device = mount_entry->mnt_fsname;
		mount_point = mount_entry->mnt_dir;

		if (statfs(mount_point, &s) != 0) {
			bb_simple_perror_msg(mount_point);
			goto set_error;
		}

		if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
			if (opt & OPT_INODE) {
				s.f_blocks = s.f_files;
				s.f_bavail = s.f_bfree = s.f_ffree;
				s.f_bsize = 1;

				if (df_disp_hr)
					df_disp_hr = 1;
			}
			blocks_used = s.f_blocks - s.f_bfree;
			blocks_percent_used = 0;
			if (blocks_used + s.f_bavail) {
				blocks_percent_used = (blocks_used * 100ULL
						+ (blocks_used + s.f_bavail)/2
						) / (blocks_used + s.f_bavail);
			}

			/* GNU coreutils 6.10 skips certain mounts, try to be compatible.  */
			if (strcmp(device, "rootfs") == 0)
				continue;

#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
			if (strcmp(device, "/dev/root") == 0) {
				/* Adjusts device to be the real root device,
				 * or leaves device alone if it can't find it */
				device = find_block_device("/");
				if (!device) {
					goto set_error;
				}
			}
#endif

#if ENABLE_FEATURE_ASSUME_UNICODE
			dev_len = unicode_strlen(device);
			if (dev_len > 20) {
				printf("%s\n%20s", device, "");
			} else {
				printf("%s%*s", device, 20 - (int)dev_len, "");
			}
#else
			if (printf("\n%-20s" + 1, device) > 20)
				    printf("\n%-20s", "");
#endif

#if ENABLE_FEATURE_HUMAN_READABLE
			printf(" %9s ",
				/* f_blocks x f_bsize / df_disp_hr, show one fractional,
				 * use suffixes if df_disp_hr == 0 */
				make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));

			printf(" %9s " + 1,
				/* EXPR x f_bsize / df_disp_hr, show one fractional,
				 * use suffixes if df_disp_hr == 0 */
				make_human_readable_str((s.f_blocks - s.f_bfree),
						s.f_bsize, df_disp_hr));

			printf("%9s %3u%% %s\n",
				/* f_bavail x f_bsize / df_disp_hr, show one fractional,
				 * use suffixes if df_disp_hr == 0 */
				make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
				blocks_percent_used, mount_point);
#else
			printf(" %9lu %9lu %9lu %3u%% %s\n",
				kscale(s.f_blocks, s.f_bsize),
				kscale(s.f_blocks - s.f_bfree, s.f_bsize),
				kscale(s.f_bavail, s.f_bsize),
				blocks_percent_used, mount_point);
#endif
		}
	}

	return status;
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Mini df implementation for busybox
4			*
5			* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6			* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
7			*
8			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9			*/
10
11	niro	816	/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
12	niro	532	/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
13
14			/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
15			*
16			* Size reduction. Removed floating point dependency. Added error checking
17			* on output. Output stats on 0-sized filesystems if specifically listed on
18			* the command line. Properly round *-blocks, Used, and Available quantities.
19	niro	816	*
20			* Aug 28, 2008 Bernhard Reutner-Fischer
21			*
22			* Implement -P and -B; better coreutils compat; cleanup
23	niro	532	*/
24
25			#include <mntent.h>
26			#include <sys/vfs.h>
27	niro	816	#include "libbb.h"
28	niro	984	#include "unicode.h"
29	niro	532
30	niro	816	#if !ENABLE_FEATURE_HUMAN_READABLE
31			static unsigned long kscale(unsigned long b, unsigned long bs)
32	niro	532	{
33	niro	816	return (b * (unsigned long long) bs + 1024/2) / 1024;
34	niro	532	}
35			#endif
36
37	niro	816	int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
38	niro	984	int df_main(int argc UNUSED_PARAM, char **argv)
39	niro	532	{
40	niro	816	unsigned long blocks_used;
41			unsigned blocks_percent_used;
42	niro	532	unsigned long df_disp_hr = 1024;
43			int status = EXIT_SUCCESS;
44			unsigned opt;
45			FILE *mount_table;
46			struct mntent *mount_entry;
47			struct statfs s;
48
49	niro	816	enum {
50			OPT_KILO = (1 << 0),
51			OPT_POSIX = (1 << 1),
52			OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
53			OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
54			OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
55	niro	984	OPT_HUMAN = (1 << (2 + 3ENABLE_FEATURE_DF_FANCY)) ENABLE_FEATURE_HUMAN_READABLE,
56			OPT_MEGA = (1 << (3 + 3ENABLE_FEATURE_DF_FANCY)) ENABLE_FEATURE_HUMAN_READABLE,
57	niro	816	};
58			const char *disp_units_hdr = NULL;
59			char *chp;
60
61	niro	984	init_unicode();
62
63	niro	816	#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
64			opt_complementary = "k-mB:m-Bk:B-km";
65			#elif ENABLE_FEATURE_HUMAN_READABLE
66			opt_complementary = "k-m:m-k";
67			#endif
68			opt = getopt32(argv, "kP"
69	niro	984	IF_FEATURE_DF_FANCY("aiB:")
70			IF_FEATURE_HUMAN_READABLE("hm")
71			IF_FEATURE_DF_FANCY(, &chp));
72	niro	816	if (opt & OPT_MEGA)
73			df_disp_hr = 1024*1024;
74
75			if (opt & OPT_BSIZE)
76			df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
77
78			/* From the manpage of df from coreutils-6.10:
79			Disk space is shown in 1K blocks by default, unless the environment
80			variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
81			*/
82			if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
83			df_disp_hr = 512;
84
85			if (opt & OPT_HUMAN) {
86	niro	532	df_disp_hr = 0;
87			disp_units_hdr = " Size";
88			}
89	niro	816	if (opt & OPT_INODE)
90			disp_units_hdr = " Inodes";
91
92			if (disp_units_hdr == NULL) {
93			#if ENABLE_FEATURE_HUMAN_READABLE
94			disp_units_hdr = xasprintf("%s-blocks",
95	niro	984	/* print df_disp_hr, show no fractionals,
96			* use suffixes if OPT_POSIX is set in opt */
97			make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
98			);
99	niro	532	#else
100	niro	816	disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
101	niro	532	#endif
102	niro	816	}
103			printf("Filesystem %-15sUsed Available %s Mounted on\n",
104			disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
105	niro	532
106			mount_table = NULL;
107			argv += optind;
108	niro	984	if (!argv[0]) {
109	niro	532	mount_table = setmntent(bb_path_mtab_file, "r");
110	niro	816	if (!mount_table)
111	niro	532	bb_perror_msg_and_die(bb_path_mtab_file);
112			}
113
114	niro	816	while (1) {
115	niro	532	const char *device;
116			const char *mount_point;
117	niro	984	#if ENABLE_FEATURE_ASSUME_UNICODE
118			size_t dev_len;
119			#endif
120	niro	532
121			if (mount_table) {
122			mount_entry = getmntent(mount_table);
123			if (!mount_entry) {
124			endmntent(mount_table);
125			break;
126			}
127			} else {
128			mount_point = *argv++;
129	niro	816	if (!mount_point)
130	niro	532	break;
131	niro	984	mount_entry = find_mount_point(mount_point, 1);
132	niro	532	if (!mount_entry) {
133			bb_error_msg("%s: can't find mount point", mount_point);
134	niro	984	set_error:
135	niro	532	status = EXIT_FAILURE;
136			continue;
137			}
138			}
139
140			device = mount_entry->mnt_fsname;
141			mount_point = mount_entry->mnt_dir;
142
143			if (statfs(mount_point, &s) != 0) {
144	niro	816	bb_simple_perror_msg(mount_point);
145	niro	984	goto set_error;
146	niro	532	}
147
148	niro	816	if ((s.f_blocks > 0) \|\| !mount_table \|\| (opt & OPT_ALL)) {
149			if (opt & OPT_INODE) {
150			s.f_blocks = s.f_files;
151			s.f_bavail = s.f_bfree = s.f_ffree;
152			s.f_bsize = 1;
153
154			if (df_disp_hr)
155			df_disp_hr = 1;
156			}
157	niro	532	blocks_used = s.f_blocks - s.f_bfree;
158			blocks_percent_used = 0;
159			if (blocks_used + s.f_bavail) {
160	niro	816	blocks_percent_used = (blocks_used * 100ULL
161	niro	532	+ (blocks_used + s.f_bavail)/2
162			) / (blocks_used + s.f_bavail);
163			}
164
165	niro	984	/* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
166			if (strcmp(device, "rootfs") == 0)
167	niro	532	continue;
168	niro	816
169			#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
170			if (strcmp(device, "/dev/root") == 0) {
171	niro	532	/* Adjusts device to be the real root device,
172	niro	984	* or leaves device alone if it can't find it */
173	niro	532	device = find_block_device("/");
174			if (!device) {
175	niro	984	goto set_error;
176	niro	532	}
177			}
178	niro	816	#endif
179	niro	532
180	niro	984	#if ENABLE_FEATURE_ASSUME_UNICODE
181			dev_len = unicode_strlen(device);
182			if (dev_len > 20) {
183			printf("%s\n%20s", device, "");
184			} else {
185			printf("%s%*s", device, 20 - (int)dev_len, "");
186			}
187			#else
188	niro	816	if (printf("\n%-20s" + 1, device) > 20)
189			printf("\n%-20s", "");
190	niro	984	#endif
191
192	niro	816	#if ENABLE_FEATURE_HUMAN_READABLE
193			printf(" %9s ",
194	niro	984	/* f_blocks x f_bsize / df_disp_hr, show one fractional,
195			* use suffixes if df_disp_hr == 0 */
196	niro	532	make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
197
198	niro	816	printf(" %9s " + 1,
199	niro	984	/* EXPR x f_bsize / df_disp_hr, show one fractional,
200			* use suffixes if df_disp_hr == 0 */
201	niro	816	make_human_readable_str((s.f_blocks - s.f_bfree),
202	niro	532	s.f_bsize, df_disp_hr));
203
204	niro	816	printf("%9s %3u%% %s\n",
205	niro	984	/* f_bavail x f_bsize / df_disp_hr, show one fractional,
206			* use suffixes if df_disp_hr == 0 */
207			make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
208			blocks_percent_used, mount_point);
209	niro	532	#else
210	niro	816	printf(" %9lu %9lu %9lu %3u%% %s\n",
211	niro	984	kscale(s.f_blocks, s.f_bsize),
212			kscale(s.f_blocks - s.f_bfree, s.f_bsize),
213			kscale(s.f_bavail, s.f_bsize),
214			blocks_percent_used, mount_point);
215	niro	532	#endif
216			}
217	niro	816	}
218	niro	532
219	niro	816	return status;
220	niro	532	}