summaryrefslogtreecommitdiff
path: root/coreutils/df.c
blob: 9cb328aa3117b36ba4bc5a1bc959633497b39031 (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
/* 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 <mntent.h>
#include <sys/vfs.h>
#include "libbb.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, char **argv)
{
	unsigned long blocks_used;
	unsigned blocks_percent_used;
#if ENABLE_FEATURE_HUMAN_READABLE
	unsigned df_disp_hr = 1024;
#endif
	int status = EXIT_SUCCESS;
	unsigned opt;
	FILE *mount_table;
	struct mntent *mount_entry;
	struct statfs s;
	/* default display is kilobytes */
	const char *disp_units_hdr = "1k-blocks";

	enum {
		OPT_ALL = (1 << 0),
		OPT_INODE = (ENABLE_FEATURE_HUMAN_READABLE ? (1 << 4) : (1 << 2))
		            * ENABLE_FEATURE_DF_INODE
	};

#if ENABLE_FEATURE_HUMAN_READABLE
	opt_complementary = "h-km:k-hm:m-hk";
	opt = getopt32(argv, "ahmk" USE_FEATURE_DF_INODE("i"));
	if (opt & (1 << 1)) { // -h
		df_disp_hr = 0;
		disp_units_hdr = "     Size";
	}
	if (opt & (1 << 2)) { // -m
		df_disp_hr = 1024*1024;
		disp_units_hdr = "1M-blocks";
	}
	if (opt & OPT_INODE) {
		disp_units_hdr = "   Inodes";
	}
#else
	opt = getopt32(argv, "ak" USE_FEATURE_DF_INODE("i"));
#endif

	printf("Filesystem           %-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);
		}
	}

	while (1) {
		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_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 ENABLE_FEATURE_HUMAN_READABLE
				if (df_disp_hr)
					df_disp_hr = 1;
#endif
			}
			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);
			}

#ifdef WHY_IT_SHOULD_BE_HIDDEN
			if (strcmp(device, "rootfs") == 0) {
				continue;
			}
#endif
#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
/* ... and also this is the only user of find_block_device */
			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 (printf("\n%-20s" + 1, device) > 20)
				    printf("\n%-20s", "");
#if ENABLE_FEATURE_HUMAN_READABLE
			printf(" %9s ",
				make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));

			printf(" %9s " + 1,
				make_human_readable_str((s.f_blocks - s.f_bfree),
						s.f_bsize, df_disp_hr));

			printf("%9s %3u%% %s\n",
					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
		}
	}

	fflush_stdout_and_exit(status);
}