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 -- options -P and -t missing.  Also blocksize. */
/* 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <mntent.h>
#include <sys/vfs.h>
#include "busybox.h"

#ifndef CONFIG_FEATURE_HUMAN_READABLE
static long kscale(long b, long bs)
{
	return ( b * (long long) bs + 1024/2 ) / 1024;
}
#endif

int df_main(int argc, char **argv)
{
	long blocks_used;
	long blocks_percent_used;
#ifdef CONFIG_FEATURE_HUMAN_READABLE
	unsigned long df_disp_hr = 1024;
#endif
	int status = EXIT_SUCCESS;
	unsigned opt;
	FILE *mount_table;
	struct mntent *mount_entry;
	struct statfs s;
	static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
	const char *disp_units_hdr = hdr_1k;

#ifdef CONFIG_FEATURE_HUMAN_READABLE
	opt_complementary = "h-km:k-hm:m-hk";
	opt = getopt32(argc, argv, "hmk");
	if (opt & 1) {
		df_disp_hr = 0;
		disp_units_hdr = "     Size";
	}
	if (opt & 2) {
		df_disp_hr = 1024*1024;
		disp_units_hdr = "1M-blocks";
	}
#else
	opt = getopt32(argc, argv, "k");
#endif

	printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
			  "", disp_units_hdr);

	mount_table = NULL;
	argv += optind;
	if (optind >= argc) {
		mount_table = setmntent(bb_path_mtab_file, "r");
		if (!mount_table) {
			bb_perror_msg_and_die(bb_path_mtab_file);
		}
	}

	do {
		const char *device;
		const char *mount_point;

		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, bb_path_mtab_file);
			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_perror_msg("%s", mount_point);
			goto SET_ERROR;
		}

		if ((s.f_blocks > 0) || !mount_table){
			blocks_used = s.f_blocks - s.f_bfree;
			blocks_percent_used = 0;
			if (blocks_used + s.f_bavail) {
				blocks_percent_used = (((long long) blocks_used) * 100
						+ (blocks_used + s.f_bavail)/2
						) / (blocks_used + s.f_bavail);
			}

			if (strcmp(device, "rootfs") == 0) {
				continue;
			} else 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;
				}
			}

#ifdef CONFIG_FEATURE_HUMAN_READABLE
			printf("%-20s %9s ", device,
				make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));

			printf("%9s ",
				make_human_readable_str( (s.f_blocks - s.f_bfree),
						s.f_bsize, df_disp_hr));

			printf("%9s %3ld%% %s\n",
					  make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
					  blocks_percent_used, mount_point);
#else
			printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
					  device,
					  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
		}

	} while (1);

	fflush_stdout_and_exit(status);
}
1	/* 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	/* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
12	/* 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	*/
20
21	#include <stdio.h>
22	#include <stdlib.h>
23	#include <string.h>
24	#include <unistd.h>
25	#include <mntent.h>
26	#include <sys/vfs.h>
27	#include "busybox.h"
28
29	#ifndef CONFIG_FEATURE_HUMAN_READABLE
30	static long kscale(long b, long bs)
31	{
32	return ( b * (long long) bs + 1024/2 ) / 1024;
33	}
34	#endif
35
36	int df_main(int argc, char **argv)
37	{
38	long blocks_used;
39	long blocks_percent_used;
40	#ifdef CONFIG_FEATURE_HUMAN_READABLE
41	unsigned long df_disp_hr = 1024;
42	#endif
43	int status = EXIT_SUCCESS;
44	unsigned opt;
45	FILE *mount_table;
46	struct mntent *mount_entry;
47	struct statfs s;
48	static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
49	const char *disp_units_hdr = hdr_1k;
50
51	#ifdef CONFIG_FEATURE_HUMAN_READABLE
52	opt_complementary = "h-km:k-hm:m-hk";
53	opt = getopt32(argc, argv, "hmk");
54	if (opt & 1) {
55	df_disp_hr = 0;
56	disp_units_hdr = " Size";
57	}
58	if (opt & 2) {
59	df_disp_hr = 1024*1024;
60	disp_units_hdr = "1M-blocks";
61	}
62	#else
63	opt = getopt32(argc, argv, "k");
64	#endif
65
66	printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
67	"", disp_units_hdr);
68
69	mount_table = NULL;
70	argv += optind;
71	if (optind >= argc) {
72	mount_table = setmntent(bb_path_mtab_file, "r");
73	if (!mount_table) {
74	bb_perror_msg_and_die(bb_path_mtab_file);
75	}
76	}
77
78	do {
79	const char *device;
80	const char *mount_point;
81
82	if (mount_table) {
83	mount_entry = getmntent(mount_table);
84	if (!mount_entry) {
85	endmntent(mount_table);
86	break;
87	}
88	} else {
89	mount_point = *argv++;
90	if (!mount_point) {
91	break;
92	}
93	mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
94	if (!mount_entry) {
95	bb_error_msg("%s: can't find mount point", mount_point);
96	SET_ERROR:
97	status = EXIT_FAILURE;
98	continue;
99	}
100	}
101
102	device = mount_entry->mnt_fsname;
103	mount_point = mount_entry->mnt_dir;
104
105	if (statfs(mount_point, &s) != 0) {
106	bb_perror_msg("%s", mount_point);
107	goto SET_ERROR;
108	}
109
110	if ((s.f_blocks > 0) \|\| !mount_table){
111	blocks_used = s.f_blocks - s.f_bfree;
112	blocks_percent_used = 0;
113	if (blocks_used + s.f_bavail) {
114	blocks_percent_used = (((long long) blocks_used) * 100
115	+ (blocks_used + s.f_bavail)/2
116	) / (blocks_used + s.f_bavail);
117	}
118
119	if (strcmp(device, "rootfs") == 0) {
120	continue;
121	} else if (strcmp(device, "/dev/root") == 0) {
122	/* Adjusts device to be the real root device,
123	* or leaves device alone if it can't find it */
124	device = find_block_device("/");
125	if (!device) {
126	goto SET_ERROR;
127	}
128	}
129
130	#ifdef CONFIG_FEATURE_HUMAN_READABLE
131	printf("%-20s %9s ", device,
132	make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
133
134	printf("%9s ",
135	make_human_readable_str( (s.f_blocks - s.f_bfree),
136	s.f_bsize, df_disp_hr));
137
138	printf("%9s %3ld%% %s\n",
139	make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
140	blocks_percent_used, mount_point);
141	#else
142	printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
143	device,
144	kscale(s.f_blocks, s.f_bsize),
145	kscale(s.f_blocks-s.f_bfree, s.f_bsize),
146	kscale(s.f_bavail, s.f_bsize),
147	blocks_percent_used, mount_point);
148	#endif
149	}
150
151	} while (1);
152
153	fflush_stdout_and_exit(status);
154	}