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 tarball for details.
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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 | #include "libbb.h"
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27 |
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28 | #if ENABLE_FEATURE_HUMAN_READABLE
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29 | # if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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30 | static unsigned long disp_hr = 1024;
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31 | # else
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32 | static unsigned long disp_hr = 512;
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33 | # endif
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34 | #elif ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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35 | static unsigned disp_k = 1;
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36 | #else
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37 | static unsigned disp_k; /* bss inits to 0 */
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38 | #endif
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39 |
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40 | static int max_print_depth = INT_MAX;
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41 | static nlink_t count_hardlinks = 1;
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42 |
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43 | static int status;
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44 | static int print_files;
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45 | static int slink_depth;
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46 | static int du_depth;
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47 | static int one_file_system;
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48 | static dev_t dir_dev;
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49 |
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50 |
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51 | static void print(long size, const char *const filename)
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52 | {
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53 | /* TODO - May not want to defer error checking here. */
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54 | #if ENABLE_FEATURE_HUMAN_READABLE
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55 | printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
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56 | filename);
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57 | #else
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58 | if (disp_k) {
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59 | size++;
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60 | size >>= 1;
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61 | }
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62 | printf("%ld\t%s\n", size, filename);
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63 | #endif
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64 | }
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65 |
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66 | /* tiny recursive du */
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67 | static long du(const char *const filename)
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68 | {
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69 | struct stat statbuf;
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70 | long sum;
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71 |
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72 | if (lstat(filename, &statbuf) != 0) {
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73 | bb_perror_msg("%s", filename);
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74 | status = EXIT_FAILURE;
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75 | return 0;
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76 | }
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77 |
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78 | if (one_file_system) {
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79 | if (du_depth == 0) {
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80 | dir_dev = statbuf.st_dev;
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81 | } else if (dir_dev != statbuf.st_dev) {
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82 | return 0;
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83 | }
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84 | }
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85 |
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86 | sum = statbuf.st_blocks;
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87 |
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88 | if (S_ISLNK(statbuf.st_mode)) {
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89 | if (slink_depth > du_depth) { /* -H or -L */
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90 | if (stat(filename, &statbuf) != 0) {
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91 | bb_perror_msg("%s", filename);
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92 | status = EXIT_FAILURE;
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93 | return 0;
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94 | }
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95 | sum = statbuf.st_blocks;
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96 | if (slink_depth == 1) {
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97 | slink_depth = INT_MAX; /* Convert -H to -L. */
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98 | }
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99 | }
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100 | }
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101 |
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102 | if (statbuf.st_nlink > count_hardlinks) {
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103 | /* Add files/directories with links only once */
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104 | if (is_in_ino_dev_hashtable(&statbuf)) {
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105 | return 0;
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106 | }
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107 | add_to_ino_dev_hashtable(&statbuf, NULL);
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108 | }
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109 |
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110 | if (S_ISDIR(statbuf.st_mode)) {
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111 | DIR *dir;
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112 | struct dirent *entry;
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113 | char *newfile;
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114 |
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115 | dir = warn_opendir(filename);
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116 | if (!dir) {
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117 | status = EXIT_FAILURE;
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118 | return sum;
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119 | }
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120 |
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121 | newfile = last_char_is(filename, '/');
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122 | if (newfile)
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123 | *newfile = '\0';
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124 |
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125 | while ((entry = readdir(dir))) {
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126 | char *name = entry->d_name;
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127 |
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128 | newfile = concat_subpath_file(filename, name);
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129 | if (newfile == NULL)
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130 | continue;
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131 | ++du_depth;
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132 | sum += du(newfile);
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133 | --du_depth;
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134 | free(newfile);
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135 | }
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136 | closedir(dir);
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137 | } else if (du_depth > print_files) {
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138 | return sum;
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139 | }
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140 | if (du_depth <= max_print_depth) {
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141 | print(sum, filename);
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142 | }
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143 | return sum;
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144 | }
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145 |
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146 | int du_main(int argc, char **argv);
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147 | int du_main(int argc, char **argv)
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148 | {
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149 | long total;
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150 | int slink_depth_save;
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151 | int print_final_total;
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152 | char *smax_print_depth;
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153 | unsigned opt;
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154 |
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155 | #if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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156 | if (getenv("POSIXLY_CORRECT")) { /* TODO - a new libbb function? */
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157 | #if ENABLE_FEATURE_HUMAN_READABLE
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158 | disp_hr = 512;
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159 | #else
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160 | disp_k = 0;
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161 | #endif
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162 | }
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163 | #endif
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164 |
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165 | /* Note: SUSv3 specifies that -a and -s options cannot be used together
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166 | * in strictly conforming applications. However, it also says that some
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167 | * du implementations may produce output when -a and -s are used together.
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168 | * gnu du exits with an error code in this case. We choose to simply
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169 | * ignore -a. This is consistent with -s being equivalent to -d 0.
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170 | */
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171 | #if ENABLE_FEATURE_HUMAN_READABLE
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172 | opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
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173 | opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
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174 | if (opt & (1 << 9)) {
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175 | /* -h opt */
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176 | disp_hr = 0;
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177 | }
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178 | if (opt & (1 << 10)) {
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179 | /* -m opt */
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180 | disp_hr = 1024*1024;
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181 | }
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182 | if (opt & (1 << 2)) {
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183 | /* -k opt */
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184 | disp_hr = 1024;
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185 | }
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186 | #else
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187 | opt_complementary = "H-L:L-H:s-d:d-s";
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188 | opt = getopt32(argv, "aHkLsx" "d:" "lc", &smax_print_depth);
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189 | #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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190 | if (opt & (1 << 2)) {
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191 | /* -k opt */
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192 | disp_k = 1;
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193 | }
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194 | #endif
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195 | #endif
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196 | if (opt & (1 << 0)) {
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197 | /* -a opt */
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198 | print_files = INT_MAX;
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199 | }
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200 | if (opt & (1 << 1)) {
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201 | /* -H opt */
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202 | slink_depth = 1;
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203 | }
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204 | if (opt & (1 << 3)) {
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205 | /* -L opt */
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206 | slink_depth = INT_MAX;
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207 | }
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208 | if (opt & (1 << 4)) {
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209 | /* -s opt */
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210 | max_print_depth = 0;
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211 | }
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212 | one_file_system = opt & (1 << 5); /* -x opt */
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213 | if (opt & (1 << 6)) {
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214 | /* -d opt */
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215 | max_print_depth = xatoi_u(smax_print_depth);
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216 | }
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217 | if (opt & (1 << 7)) {
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218 | /* -l opt */
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219 | count_hardlinks = MAXINT(nlink_t);
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220 | }
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221 | print_final_total = opt & (1 << 8); /* -c opt */
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222 |
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223 | /* go through remaining args (if any) */
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224 | argv += optind;
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225 | if (optind >= argc) {
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226 | *--argv = (char*)".";
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227 | if (slink_depth == 1) {
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228 | slink_depth = 0;
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229 | }
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230 | }
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231 |
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232 | slink_depth_save = slink_depth;
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233 | total = 0;
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234 | do {
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235 | total += du(*argv);
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236 | slink_depth = slink_depth_save;
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237 | } while (*++argv);
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238 | if (ENABLE_FEATURE_CLEAN_UP)
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239 | reset_ino_dev_hashtable();
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240 | if (print_final_total) {
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241 | print(total, "total");
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242 | }
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243 |
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244 | fflush_stdout_and_exit(status);
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245 | }
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