coreutils/du.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini du implementation for busybox
   4  *
   5  * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
   6  * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
   7  * Copyright (C) 2002  Edward Betts <edward@debian.org>
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  10  */
  11
  12 /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
  13 /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
  14
  15 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  16  *
  17  * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
  18  * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
  19  *    The -d option allows setting of max depth (similar to gnu --max-depth).
  20  * 2) Fixed incorrect size calculations for links and directories, especially
  21  *    when errors occurred.  Calculates sizes should now match gnu du output.
  22  * 3) Added error checking of output.
  23  * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
  24  */
  25
  26 //usage:#define du_trivial_usage
  27 //usage:       "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
  28 //usage:#define du_full_usage "\n\n"
  29 //usage:       "Summarize disk space used for each FILE and/or directory\n"
  30 //usage:     "\n        -a      Show file sizes too"
  31 //usage:     "\n        -L      Follow all symlinks"
  32 //usage:     "\n        -H      Follow symlinks on command line"
  33 //usage:     "\n        -d N    Limit output to directories (and files with -a) of depth < N"
  34 //usage:     "\n        -c      Show grand total"
  35 //usage:     "\n        -l      Count sizes many times if hard linked"
  36 //usage:     "\n        -s      Display only a total for each argument"
  37 //usage:     "\n        -x      Skip directories on different filesystems"
  38 //usage:        IF_FEATURE_HUMAN_READABLE(
  39 //usage:     "\n        -h      Sizes in human readable format (e.g., 1K 243M 2G)"
  40 //usage:     "\n        -m      Sizes in megabytes"
  41 //usage:        )
  42 //usage:     "\n        -k      Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
  43 //usage:        IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
  44 //usage:     "\n                Default unit is 512 bytes"
  45 //usage:        )
  46 //usage:
  47 //usage:#define du_example_usage
  48 //usage:       "$ du\n"
  49 //usage:       "16      ./CVS\n"
  50 //usage:       "12      ./kernel-patches/CVS\n"
  51 //usage:       "80      ./kernel-patches\n"
  52 //usage:       "12      ./tests/CVS\n"
  53 //usage:       "36      ./tests\n"
  54 //usage:       "12      ./scripts/CVS\n"
  55 //usage:       "16      ./scripts\n"
  56 //usage:       "12      ./docs/CVS\n"
  57 //usage:       "104     ./docs\n"
  58 //usage:       "2417    .\n"
  59
  60 #include "libbb.h"
  61
  62 enum {
  63         OPT_a_files_too    = (1 << 0),
  64         OPT_H_follow_links = (1 << 1),
  65         OPT_k_kbytes       = (1 << 2),
  66         OPT_L_follow_links = (1 << 3),
  67         OPT_s_total_norecurse = (1 << 4),
  68         OPT_x_one_FS       = (1 << 5),
  69         OPT_d_maxdepth     = (1 << 6),
  70         OPT_l_hardlinks    = (1 << 7),
  71         OPT_c_total        = (1 << 8),
  72         OPT_h_for_humans   = (1 << 9),
  73         OPT_m_mbytes       = (1 << 10),
  74 };
  75
  76 struct globals {
  77 #if ENABLE_FEATURE_HUMAN_READABLE
  78         unsigned long disp_unit;
  79 #else
  80         unsigned disp_k;
  81 #endif
  82         int max_print_depth;
  83         bool status;
  84         int slink_depth;
  85         int du_depth;
  86         dev_t dir_dev;
  87 } FIX_ALIASING;
  88 #define G (*(struct globals*)&bb_common_bufsiz1)
  89 #define INIT_G() do { } while (0)
  90
  91
  92 static void print(unsigned long long size, const char *filename)
  93 {
  94         /* TODO - May not want to defer error checking here. */
  95 #if ENABLE_FEATURE_HUMAN_READABLE
  96 # if ENABLE_DESKTOP
  97         /* ~30 bytes of code for extra comtat:
  98          * coreutils' du rounds sizes up:
  99          * for example,  1025k file is shown as "2" by du -m.
 100          * We round to nearest if human-readable [too hard to fix],
 101          * else (fixed scale such as -m), we round up. To that end,
 102          * add yet another half of the unit before displaying:
 103          */
 104         if (G.disp_unit)
 105                 size += (G.disp_unit-1) / (unsigned)(512 * 2);
 106 # endif
 107         printf("%s\t%s\n",
 108                         /* size x 512 / G.disp_unit.
 109                          * If G.disp_unit == 0, show one fractional
 110                          * and use suffixes
 111                          */
 112                         make_human_readable_str(size, 512, G.disp_unit),
 113                         filename);
 114 #else
 115         if (G.disp_k) {
 116                 size++;
 117                 size >>= 1;
 118         }
 119         printf("%llu\t%s\n", size, filename);
 120 #endif
 121 }
 122
 123 /* tiny recursive du */
 124 static unsigned long long du(const char *filename)
 125 {
 126         struct stat statbuf;
 127         unsigned long long sum;
 128
 129         if (lstat(filename, &statbuf) != 0) {
 130                 bb_simple_perror_msg(filename);
 131                 G.status = EXIT_FAILURE;
 132                 return 0;
 133         }
 134
 135         if (option_mask32 & OPT_x_one_FS) {
 136                 if (G.du_depth == 0) {
 137                         G.dir_dev = statbuf.st_dev;
 138                 } else if (G.dir_dev != statbuf.st_dev) {
 139                         return 0;
 140                 }
 141         }
 142
 143         sum = statbuf.st_blocks;
 144
 145         if (S_ISLNK(statbuf.st_mode)) {
 146                 if (G.slink_depth > G.du_depth) { /* -H or -L */
 147                         if (stat(filename, &statbuf) != 0) {
 148                                 bb_simple_perror_msg(filename);
 149                                 G.status = EXIT_FAILURE;
 150                                 return 0;
 151                         }
 152                         sum = statbuf.st_blocks;
 153                         if (G.slink_depth == 1) {
 154                                 /* Convert -H to -L */
 155                                 G.slink_depth = INT_MAX;
 156                         }
 157                 }
 158         }
 159
 160         if (!(option_mask32 & OPT_l_hardlinks)
 161          && statbuf.st_nlink > 1
 162         ) {
 163                 /* Add files/directories with links only once */
 164                 if (is_in_ino_dev_hashtable(&statbuf)) {
 165                         return 0;
 166                 }
 167                 add_to_ino_dev_hashtable(&statbuf, NULL);
 168         }
 169
 170         if (S_ISDIR(statbuf.st_mode)) {
 171                 DIR *dir;
 172                 struct dirent *entry;
 173                 char *newfile;
 174
 175                 dir = warn_opendir(filename);
 176                 if (!dir) {
 177                         G.status = EXIT_FAILURE;
 178                         return sum;
 179                 }
 180
 181                 while ((entry = readdir(dir))) {
 182                         newfile = concat_subpath_file(filename, entry->d_name);
 183                         if (newfile == NULL)
 184                                 continue;
 185                         ++G.du_depth;
 186                         sum += du(newfile);
 187                         --G.du_depth;
 188                         free(newfile);
 189                 }
 190                 closedir(dir);
 191         } else {
 192                 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
 193                         return sum;
 194         }
 195         if (G.du_depth <= G.max_print_depth) {
 196                 print(sum, filename);
 197         }
 198         return sum;
 199 }
 200
 201 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 202 int du_main(int argc UNUSED_PARAM, char **argv)
 203 {
 204         unsigned long long total;
 205         int slink_depth_save;
 206         unsigned opt;
 207
 208         INIT_G();
 209
 210 #if ENABLE_FEATURE_HUMAN_READABLE
 211         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 1024;)
 212         IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 512;)
 213         if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
 214                 G.disp_unit = 512;
 215 #else
 216         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
 217         /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
 218 #endif
 219         G.max_print_depth = INT_MAX;
 220
 221         /* Note: SUSv3 specifies that -a and -s options cannot be used together
 222          * in strictly conforming applications.  However, it also says that some
 223          * du implementations may produce output when -a and -s are used together.
 224          * gnu du exits with an error code in this case.  We choose to simply
 225          * ignore -a.  This is consistent with -s being equivalent to -d 0.
 226          */
 227 #if ENABLE_FEATURE_HUMAN_READABLE
 228         opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
 229         opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
 230         argv += optind;
 231         if (opt & OPT_h_for_humans) {
 232                 G.disp_unit = 0;
 233         }
 234         if (opt & OPT_m_mbytes) {
 235                 G.disp_unit = 1024*1024;
 236         }
 237         if (opt & OPT_k_kbytes) {
 238                 G.disp_unit = 1024;
 239         }
 240 #else
 241         opt_complementary = "H-L:L-H:s-d:d-s:d+";
 242         opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
 243         argv += optind;
 244 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 245         if (opt & OPT_k_kbytes) {
 246                 G.disp_k = 1;
 247         }
 248 #endif
 249 #endif
 250         if (opt & OPT_H_follow_links) {
 251                 G.slink_depth = 1;
 252         }
 253         if (opt & OPT_L_follow_links) {
 254                 G.slink_depth = INT_MAX;
 255         }
 256         if (opt & OPT_s_total_norecurse) {
 257                 G.max_print_depth = 0;
 258         }
 259
 260         /* go through remaining args (if any) */
 261         if (!*argv) {
 262                 *--argv = (char*)".";
 263                 if (G.slink_depth == 1) {
 264                         G.slink_depth = 0;
 265                 }
 266         }
 267
 268         slink_depth_save = G.slink_depth;
 269         total = 0;
 270         do {
 271                 total += du(*argv);
 272                 /* otherwise du /dir /dir won't show /dir twice: */
 273                 reset_ino_dev_hashtable();
 274                 G.slink_depth = slink_depth_save;
 275         } while (*++argv);
 276
 277         if (opt & OPT_c_total)
 278                 print(total, "total");
 279
 280         fflush_stdout_and_exit(G.status);
 281 }