1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini du implementation for busybox
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4 | *
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5 | * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
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6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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7 | * Copyright (C) 2002 Edward Betts <edward@debian.org>
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8 | *
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9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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10 | */
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11 |
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12 | /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
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13 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
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14 |
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15 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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16 | *
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17 | * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
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18 | * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
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19 | * The -d option allows setting of max depth (similar to gnu --max-depth).
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20 | * 2) Fixed incorrect size calculations for links and directories, especially
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21 | * when errors occurred. Calculates sizes should now match gnu du output.
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22 | * 3) Added error checking of output.
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23 | * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
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24 | */
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25 |
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26 | //usage:#define du_trivial_usage
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27 | //usage: "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
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28 | //usage:#define du_full_usage "\n\n"
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29 | //usage: "Summarize disk space used for each FILE and/or directory\n"
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30 | //usage: "\n -a Show file sizes too"
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31 | //usage: "\n -L Follow all symlinks"
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32 | //usage: "\n -H Follow symlinks on command line"
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33 | //usage: "\n -d N Limit output to directories (and files with -a) of depth < N"
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34 | //usage: "\n -c Show grand total"
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35 | //usage: "\n -l Count sizes many times if hard linked"
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36 | //usage: "\n -s Display only a total for each argument"
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37 | //usage: "\n -x Skip directories on different filesystems"
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38 | //usage: IF_FEATURE_HUMAN_READABLE(
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39 | //usage: "\n -h Sizes in human readable format (e.g., 1K 243M 2G)"
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40 | //usage: "\n -m Sizes in megabytes"
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41 | //usage: )
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42 | //usage: "\n -k Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
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43 | //usage: IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
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44 | //usage: "\n Default unit is 512 bytes"
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45 | //usage: )
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46 | //usage:
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47 | //usage:#define du_example_usage
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48 | //usage: "$ du\n"
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49 | //usage: "16 ./CVS\n"
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50 | //usage: "12 ./kernel-patches/CVS\n"
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51 | //usage: "80 ./kernel-patches\n"
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52 | //usage: "12 ./tests/CVS\n"
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53 | //usage: "36 ./tests\n"
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54 | //usage: "12 ./scripts/CVS\n"
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55 | //usage: "16 ./scripts\n"
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56 | //usage: "12 ./docs/CVS\n"
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57 | //usage: "104 ./docs\n"
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58 | //usage: "2417 .\n"
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59 |
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60 | #include "libbb.h"
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61 |
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62 | enum {
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63 | OPT_a_files_too = (1 << 0),
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64 | OPT_H_follow_links = (1 << 1),
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65 | OPT_k_kbytes = (1 << 2),
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66 | OPT_L_follow_links = (1 << 3),
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67 | OPT_s_total_norecurse = (1 << 4),
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68 | OPT_x_one_FS = (1 << 5),
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69 | OPT_d_maxdepth = (1 << 6),
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70 | OPT_l_hardlinks = (1 << 7),
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71 | OPT_c_total = (1 << 8),
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72 | OPT_h_for_humans = (1 << 9),
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73 | OPT_m_mbytes = (1 << 10),
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74 | };
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75 |
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76 | struct globals {
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77 | #if ENABLE_FEATURE_HUMAN_READABLE
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78 | unsigned long disp_hr;
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79 | #else
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80 | unsigned disp_k;
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81 | #endif
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82 | int max_print_depth;
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83 | bool status;
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84 | int slink_depth;
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85 | int du_depth;
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86 | dev_t dir_dev;
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87 | } FIX_ALIASING;
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88 | #define G (*(struct globals*)&bb_common_bufsiz1)
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89 | #define INIT_G() do { } while (0)
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90 |
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91 |
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92 | /* FIXME? coreutils' du rounds sizes up:
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93 | * for example, 1025k file is shown as "2" by du -m.
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94 | * We round to nearest.
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95 | */
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96 | static void print(unsigned long long size, const char *filename)
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97 | {
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98 | /* TODO - May not want to defer error checking here. */
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99 | #if ENABLE_FEATURE_HUMAN_READABLE
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100 | printf("%s\t%s\n",
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101 | /* size x 512 / G.disp_hr, show one fractional,
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102 | * use suffixes if G.disp_hr == 0 */
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103 | make_human_readable_str(size, 512, G.disp_hr),
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104 | filename);
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105 | #else
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106 | if (G.disp_k) {
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107 | size++;
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108 | size >>= 1;
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109 | }
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110 | printf("%llu\t%s\n", size, filename);
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111 | #endif
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112 | }
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113 |
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114 | /* tiny recursive du */
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115 | static unsigned long long du(const char *filename)
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116 | {
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117 | struct stat statbuf;
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118 | unsigned long long sum;
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119 |
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120 | if (lstat(filename, &statbuf) != 0) {
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121 | bb_simple_perror_msg(filename);
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122 | G.status = EXIT_FAILURE;
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123 | return 0;
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124 | }
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125 |
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126 | if (option_mask32 & OPT_x_one_FS) {
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127 | if (G.du_depth == 0) {
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128 | G.dir_dev = statbuf.st_dev;
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129 | } else if (G.dir_dev != statbuf.st_dev) {
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130 | return 0;
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131 | }
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132 | }
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133 |
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134 | sum = statbuf.st_blocks;
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135 |
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136 | if (S_ISLNK(statbuf.st_mode)) {
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137 | if (G.slink_depth > G.du_depth) { /* -H or -L */
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138 | if (stat(filename, &statbuf) != 0) {
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139 | bb_simple_perror_msg(filename);
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140 | G.status = EXIT_FAILURE;
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141 | return 0;
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142 | }
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143 | sum = statbuf.st_blocks;
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144 | if (G.slink_depth == 1) {
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145 | /* Convert -H to -L */
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146 | G.slink_depth = INT_MAX;
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147 | }
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148 | }
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149 | }
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150 |
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151 | if (!(option_mask32 & OPT_l_hardlinks)
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152 | && statbuf.st_nlink > 1
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153 | ) {
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154 | /* Add files/directories with links only once */
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155 | if (is_in_ino_dev_hashtable(&statbuf)) {
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156 | return 0;
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157 | }
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158 | add_to_ino_dev_hashtable(&statbuf, NULL);
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159 | }
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160 |
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161 | if (S_ISDIR(statbuf.st_mode)) {
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162 | DIR *dir;
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163 | struct dirent *entry;
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164 | char *newfile;
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165 |
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166 | dir = warn_opendir(filename);
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167 | if (!dir) {
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168 | G.status = EXIT_FAILURE;
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169 | return sum;
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170 | }
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171 |
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172 | while ((entry = readdir(dir))) {
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173 | newfile = concat_subpath_file(filename, entry->d_name);
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174 | if (newfile == NULL)
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175 | continue;
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176 | ++G.du_depth;
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177 | sum += du(newfile);
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178 | --G.du_depth;
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179 | free(newfile);
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180 | }
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181 | closedir(dir);
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182 | } else {
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183 | if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
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184 | return sum;
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185 | }
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186 | if (G.du_depth <= G.max_print_depth) {
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187 | print(sum, filename);
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188 | }
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189 | return sum;
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190 | }
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191 |
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192 | int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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193 | int du_main(int argc UNUSED_PARAM, char **argv)
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194 | {
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195 | unsigned long long total;
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196 | int slink_depth_save;
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197 | unsigned opt;
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198 |
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199 | INIT_G();
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200 |
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201 | #if ENABLE_FEATURE_HUMAN_READABLE
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202 | IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
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203 | IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
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204 | if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
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205 | G.disp_hr = 512;
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206 | #else
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207 | IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
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208 | /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
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209 | #endif
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210 | G.max_print_depth = INT_MAX;
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211 |
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212 | /* Note: SUSv3 specifies that -a and -s options cannot be used together
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213 | * in strictly conforming applications. However, it also says that some
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214 | * du implementations may produce output when -a and -s are used together.
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215 | * gnu du exits with an error code in this case. We choose to simply
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216 | * ignore -a. This is consistent with -s being equivalent to -d 0.
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217 | */
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218 | #if ENABLE_FEATURE_HUMAN_READABLE
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219 | opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
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220 | opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
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221 | argv += optind;
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222 | if (opt & OPT_h_for_humans) {
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223 | G.disp_hr = 0;
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224 | }
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225 | if (opt & OPT_m_mbytes) {
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226 | G.disp_hr = 1024*1024;
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227 | }
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228 | if (opt & OPT_k_kbytes) {
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229 | G.disp_hr = 1024;
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230 | }
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231 | #else
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232 | opt_complementary = "H-L:L-H:s-d:d-s:d+";
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233 | opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
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234 | argv += optind;
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235 | #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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236 | if (opt & OPT_k_kbytes) {
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237 | G.disp_k = 1;
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238 | }
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239 | #endif
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240 | #endif
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241 | if (opt & OPT_H_follow_links) {
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242 | G.slink_depth = 1;
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243 | }
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244 | if (opt & OPT_L_follow_links) {
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245 | G.slink_depth = INT_MAX;
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246 | }
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247 | if (opt & OPT_s_total_norecurse) {
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248 | G.max_print_depth = 0;
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249 | }
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250 |
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251 | /* go through remaining args (if any) */
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252 | if (!*argv) {
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253 | *--argv = (char*)".";
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254 | if (G.slink_depth == 1) {
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255 | G.slink_depth = 0;
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256 | }
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257 | }
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258 |
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259 | slink_depth_save = G.slink_depth;
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260 | total = 0;
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261 | do {
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262 | total += du(*argv);
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263 | /* otherwise du /dir /dir won't show /dir twice: */
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264 | reset_ino_dev_hashtable();
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265 | G.slink_depth = slink_depth_save;
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266 | } while (*++argv);
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267 |
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268 | if (opt & OPT_c_total)
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269 | print(total, "total");
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270 |
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271 | fflush_stdout_and_exit(G.status);
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272 | }
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