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 #include "common_bufsiz.h"
  62
  63 enum {
  64         OPT_a_files_too    = (1 << 0),
  65         OPT_H_follow_links = (1 << 1),
  66         OPT_k_kbytes       = (1 << 2),
  67         OPT_L_follow_links = (1 << 3),
  68         OPT_s_total_norecurse = (1 << 4),
  69         OPT_x_one_FS       = (1 << 5),
  70         OPT_d_maxdepth     = (1 << 6),
  71         OPT_l_hardlinks    = (1 << 7),
  72         OPT_c_total        = (1 << 8),
  73         OPT_h_for_humans   = (1 << 9),
  74         OPT_m_mbytes       = (1 << 10),
  75 };
  76
  77 struct globals {
  78 #if ENABLE_FEATURE_HUMAN_READABLE
  79         unsigned long disp_unit;
  80 #else
  81         unsigned disp_k;
  82 #endif
  83         int max_print_depth;
  84         bool status;
  85         int slink_depth;
  86         int du_depth;
  87         dev_t dir_dev;
  88 } FIX_ALIASING;
  89 #define G (*(struct globals*)bb_common_bufsiz1)
  90 #define INIT_G() do { setup_common_bufsiz(); } while (0)
  91
  92
  93 static void print(unsigned long long size, const char *filename)
  94 {
  95         /* TODO - May not want to defer error checking here. */
  96 #if ENABLE_FEATURE_HUMAN_READABLE
  97 # if ENABLE_DESKTOP
  98         /* ~30 bytes of code for extra comtat:
  99          * coreutils' du rounds sizes up:
 100          * for example,  1025k file is shown as "2" by du -m.
 101          * We round to nearest if human-readable [too hard to fix],
 102          * else (fixed scale such as -m), we round up. To that end,
 103          * add yet another half of the unit before displaying:
 104          */
 105         if (G.disp_unit)
 106                 size += (G.disp_unit-1) / (unsigned)(512 * 2);
 107 # endif
 108         printf("%s\t%s\n",
 109                         /* size x 512 / G.disp_unit.
 110                          * If G.disp_unit == 0, show one fractional
 111                          * and use suffixes
 112                          */
 113                         make_human_readable_str(size, 512, G.disp_unit),
 114                         filename);
 115 #else
 116         if (G.disp_k) {
 117                 size++;
 118                 size >>= 1;
 119         }
 120         printf("%llu\t%s\n", size, filename);
 121 #endif
 122 }
 123
 124 /* tiny recursive du */
 125 static unsigned long long du(const char *filename)
 126 {
 127         struct stat statbuf;
 128         unsigned long long sum;
 129
 130         if (lstat(filename, &statbuf) != 0) {
 131                 bb_simple_perror_msg(filename);
 132                 G.status = EXIT_FAILURE;
 133                 return 0;
 134         }
 135
 136         if (option_mask32 & OPT_x_one_FS) {
 137                 if (G.du_depth == 0) {
 138                         G.dir_dev = statbuf.st_dev;
 139                 } else if (G.dir_dev != statbuf.st_dev) {
 140                         return 0;
 141                 }
 142         }
 143
 144         sum = statbuf.st_blocks;
 145
 146         if (S_ISLNK(statbuf.st_mode)) {
 147                 if (G.slink_depth > G.du_depth) { /* -H or -L */
 148                         if (stat(filename, &statbuf) != 0) {
 149                                 bb_simple_perror_msg(filename);
 150                                 G.status = EXIT_FAILURE;
 151                                 return 0;
 152                         }
 153                         sum = statbuf.st_blocks;
 154                         if (G.slink_depth == 1) {
 155                                 /* Convert -H to -L */
 156                                 G.slink_depth = INT_MAX;
 157                         }
 158                 }
 159         }
 160
 161         if (!(option_mask32 & OPT_l_hardlinks)
 162          && statbuf.st_nlink > 1
 163         ) {
 164                 /* Add files/directories with links only once */
 165                 if (is_in_ino_dev_hashtable(&statbuf)) {
 166                         return 0;
 167                 }
 168                 add_to_ino_dev_hashtable(&statbuf, NULL);
 169         }
 170
 171         if (S_ISDIR(statbuf.st_mode)) {
 172                 DIR *dir;
 173                 struct dirent *entry;
 174                 char *newfile;
 175
 176                 dir = warn_opendir(filename);
 177                 if (!dir) {
 178                         G.status = EXIT_FAILURE;
 179                         return sum;
 180                 }
 181
 182                 while ((entry = readdir(dir))) {
 183                         newfile = concat_subpath_file(filename, entry->d_name);
 184                         if (newfile == NULL)
 185                                 continue;
 186                         ++G.du_depth;
 187                         sum += du(newfile);
 188                         --G.du_depth;
 189                         free(newfile);
 190                 }
 191                 closedir(dir);
 192         } else {
 193                 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
 194                         return sum;
 195         }
 196         if (G.du_depth <= G.max_print_depth) {
 197                 print(sum, filename);
 198         }
 199         return sum;
 200 }
 201
 202 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 203 int du_main(int argc UNUSED_PARAM, char **argv)
 204 {
 205         unsigned long long total;
 206         int slink_depth_save;
 207         unsigned opt;
 208
 209         INIT_G();
 210
 211 #if ENABLE_FEATURE_HUMAN_READABLE
 212         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 1024;)
 213         IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 512;)
 214         if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
 215                 G.disp_unit = 512;
 216 #else
 217         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
 218         /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
 219 #endif
 220         G.max_print_depth = INT_MAX;
 221
 222         /* Note: SUSv3 specifies that -a and -s options cannot be used together
 223          * in strictly conforming applications.  However, it also says that some
 224          * du implementations may produce output when -a and -s are used together.
 225          * gnu du exits with an error code in this case.  We choose to simply
 226          * ignore -a.  This is consistent with -s being equivalent to -d 0.
 227          */
 228 #if ENABLE_FEATURE_HUMAN_READABLE
 229         opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
 230         opt = getopt32(argv, "aHkLsx" "d:+" "lc" "hm", &G.max_print_depth);
 231         argv += optind;
 232         if (opt & OPT_h_for_humans) {
 233                 G.disp_unit = 0;
 234         }
 235         if (opt & OPT_m_mbytes) {
 236                 G.disp_unit = 1024*1024;
 237         }
 238         if (opt & OPT_k_kbytes) {
 239                 G.disp_unit = 1024;
 240         }
 241 #else
 242         opt_complementary = "H-L:L-H:s-d:d-s";
 243         opt = getopt32(argv, "aHkLsx" "d:+" "lc", &G.max_print_depth);
 244         argv += optind;
 245 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 246         if (opt & OPT_k_kbytes) {
 247                 G.disp_k = 1;
 248         }
 249 #endif
 250 #endif
 251         if (opt & OPT_H_follow_links) {
 252                 G.slink_depth = 1;
 253         }
 254         if (opt & OPT_L_follow_links) {
 255                 G.slink_depth = INT_MAX;
 256         }
 257         if (opt & OPT_s_total_norecurse) {
 258                 G.max_print_depth = 0;
 259         }
 260
 261         /* go through remaining args (if any) */
 262         if (!*argv) {
 263                 *--argv = (char*)".";
 264                 if (G.slink_depth == 1) {
 265                         G.slink_depth = 0;
 266                 }
 267         }
 268
 269         slink_depth_save = G.slink_depth;
 270         total = 0;
 271         do {
 272                 total += du(*argv);
 273                 /* otherwise du /dir /dir won't show /dir twice: */
 274                 reset_ino_dev_hashtable();
 275                 G.slink_depth = slink_depth_save;
 276         } while (*++argv);
 277
 278         if (opt & OPT_c_total)
 279                 print(total, "total");
 280
 281         fflush_stdout_and_exit(G.status);
 282 }