1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini df implementation for busybox
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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9 | */
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10 |
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11 | /* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
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12 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
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13 |
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14 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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15 | *
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16 | * Size reduction. Removed floating point dependency. Added error checking
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17 | * on output. Output stats on 0-sized filesystems if specifically listed on
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18 | * the command line. Properly round *-blocks, Used, and Available quantities.
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19 | */
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20 |
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21 | #include <mntent.h>
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22 | #include <sys/vfs.h>
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23 | #include "libbb.h"
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24 |
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25 | #if !ENABLE_FEATURE_HUMAN_READABLE
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26 | static unsigned long kscale(unsigned long b, unsigned long bs)
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27 | {
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28 | return (b * (unsigned long long) bs + 1024/2) / 1024;
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29 | }
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30 | #endif
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31 |
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32 | int df_main(int argc, char **argv);
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33 | int df_main(int argc, char **argv)
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34 | {
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35 | unsigned long blocks_used;
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36 | unsigned blocks_percent_used;
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37 | #if ENABLE_FEATURE_HUMAN_READABLE
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38 | unsigned df_disp_hr = 1024;
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39 | #endif
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40 | int status = EXIT_SUCCESS;
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41 | unsigned opt;
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42 | FILE *mount_table;
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43 | struct mntent *mount_entry;
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44 | struct statfs s;
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45 | /* default display is kilobytes */
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46 | const char *disp_units_hdr = "1k-blocks";
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47 |
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48 | #if ENABLE_FEATURE_HUMAN_READABLE
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49 | opt_complementary = "h-km:k-hm:m-hk";
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50 | opt = getopt32(argv, "hmk");
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51 | if (opt & 1) {
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52 | df_disp_hr = 0;
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53 | disp_units_hdr = " Size";
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54 | }
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55 | if (opt & 2) {
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56 | df_disp_hr = 1024*1024;
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57 | disp_units_hdr = "1M-blocks";
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58 | }
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59 | #else
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60 | opt = getopt32(argv, "k");
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61 | #endif
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62 |
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63 | printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
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64 | "", disp_units_hdr);
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65 |
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66 | mount_table = NULL;
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67 | argv += optind;
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68 | if (optind >= argc) {
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69 | mount_table = setmntent(bb_path_mtab_file, "r");
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70 | if (!mount_table) {
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71 | bb_perror_msg_and_die(bb_path_mtab_file);
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72 | }
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73 | }
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74 |
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75 | while (1) {
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76 | const char *device;
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77 | const char *mount_point;
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78 |
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79 | if (mount_table) {
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80 | mount_entry = getmntent(mount_table);
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81 | if (!mount_entry) {
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82 | endmntent(mount_table);
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83 | break;
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84 | }
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85 | } else {
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86 | mount_point = *argv++;
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87 | if (!mount_point) {
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88 | break;
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89 | }
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90 | mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
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91 | if (!mount_entry) {
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92 | bb_error_msg("%s: can't find mount point", mount_point);
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93 | SET_ERROR:
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94 | status = EXIT_FAILURE;
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95 | continue;
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96 | }
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97 | }
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98 |
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99 | device = mount_entry->mnt_fsname;
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100 | mount_point = mount_entry->mnt_dir;
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101 |
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102 | if (statfs(mount_point, &s) != 0) {
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103 | bb_perror_msg("%s", mount_point);
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104 | goto SET_ERROR;
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105 | }
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106 |
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107 | if ((s.f_blocks > 0) || !mount_table){
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108 | blocks_used = s.f_blocks - s.f_bfree;
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109 | blocks_percent_used = 0;
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110 | if (blocks_used + s.f_bavail) {
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111 | blocks_percent_used = (blocks_used * 100ULL
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112 | + (blocks_used + s.f_bavail)/2
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113 | ) / (blocks_used + s.f_bavail);
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114 | }
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115 |
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116 | if (strcmp(device, "rootfs") == 0) {
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117 | continue;
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118 | } else if (strcmp(device, "/dev/root") == 0) {
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119 | /* Adjusts device to be the real root device,
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120 | * or leaves device alone if it can't find it */
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121 | device = find_block_device("/");
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122 | if (!device) {
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123 | goto SET_ERROR;
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124 | }
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125 | }
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126 |
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127 | if (printf("\n%-20s" + 1, device) > 20)
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128 | printf("\n%-20s", "");
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129 | #if ENABLE_FEATURE_HUMAN_READABLE
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130 | printf(" %9s ",
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131 | make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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132 |
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133 | printf(" %9s " + 1,
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134 | make_human_readable_str((s.f_blocks - s.f_bfree),
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135 | s.f_bsize, df_disp_hr));
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136 |
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137 | printf("%9s %3u%% %s\n",
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138 | make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
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139 | blocks_percent_used, mount_point);
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140 | #else
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141 | printf(" %9lu %9lu %9lu %3u%% %s\n",
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142 | kscale(s.f_blocks, s.f_bsize),
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143 | kscale(s.f_blocks-s.f_bfree, s.f_bsize),
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144 | kscale(s.f_bavail, s.f_bsize),
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145 | blocks_percent_used, mount_point);
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146 | #endif
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147 | }
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148 | }
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149 |
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150 | fflush_stdout_and_exit(status);
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151 | }
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