release/src/router/busybox/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_hr;
  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         printf("%s\t%s\n",
  97                         /* size x 512 / G.disp_hr, show one fractional,
  98                          * use suffixes if G.disp_hr == 0 */
  99                         make_human_readable_str(size, 512, G.disp_hr),
 100                         filename);
 101 #else
 102         if (G.disp_k) {
 103                 size++;
 104                 size >>= 1;
 105         }
 106         printf("%llu\t%s\n", size, filename);
 107 #endif
 108 }
 109
 110 /* tiny recursive du */
 111 static unsigned long long du(const char *filename)
 112 {
 113         struct stat statbuf;
 114         unsigned long long sum;
 115
 116         if (lstat(filename, &statbuf) != 0) {
 117                 bb_simple_perror_msg(filename);
 118                 G.status = EXIT_FAILURE;
 119                 return 0;
 120         }
 121
 122         if (option_mask32 & OPT_x_one_FS) {
 123                 if (G.du_depth == 0) {
 124                         G.dir_dev = statbuf.st_dev;
 125                 } else if (G.dir_dev != statbuf.st_dev) {
 126                         return 0;
 127                 }
 128         }
 129
 130         sum = statbuf.st_blocks;
 131
 132         if (S_ISLNK(statbuf.st_mode)) {
 133                 if (G.slink_depth > G.du_depth) { /* -H or -L */
 134                         if (stat(filename, &statbuf) != 0) {
 135                                 bb_simple_perror_msg(filename);
 136                                 G.status = EXIT_FAILURE;
 137                                 return 0;
 138                         }
 139                         sum = statbuf.st_blocks;
 140                         if (G.slink_depth == 1) {
 141                                 /* Convert -H to -L */
 142                                 G.slink_depth = INT_MAX;
 143                         }
 144                 }
 145         }
 146
 147         if (!(option_mask32 & OPT_l_hardlinks)
 148          && statbuf.st_nlink > 1
 149         ) {
 150                 /* Add files/directories with links only once */
 151                 if (is_in_ino_dev_hashtable(&statbuf)) {
 152                         return 0;
 153                 }
 154                 add_to_ino_dev_hashtable(&statbuf, NULL);
 155         }
 156
 157         if (S_ISDIR(statbuf.st_mode)) {
 158                 DIR *dir;
 159                 struct dirent *entry;
 160                 char *newfile;
 161
 162                 dir = warn_opendir(filename);
 163                 if (!dir) {
 164                         G.status = EXIT_FAILURE;
 165                         return sum;
 166                 }
 167
 168                 while ((entry = readdir(dir))) {
 169                         newfile = concat_subpath_file(filename, entry->d_name);
 170                         if (newfile == NULL)
 171                                 continue;
 172                         ++G.du_depth;
 173                         sum += du(newfile);
 174                         --G.du_depth;
 175                         free(newfile);
 176                 }
 177                 closedir(dir);
 178         } else {
 179                 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
 180                         return sum;
 181         }
 182         if (G.du_depth <= G.max_print_depth) {
 183                 print(sum, filename);
 184         }
 185         return sum;
 186 }
 187
 188 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 189 int du_main(int argc UNUSED_PARAM, char **argv)
 190 {
 191         unsigned long long total;
 192         int slink_depth_save;
 193         unsigned opt;
 194
 195         INIT_G();
 196
 197 #if ENABLE_FEATURE_HUMAN_READABLE
 198         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
 199         IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
 200         if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
 201                 G.disp_hr = 512;
 202 #else
 203         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
 204         /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
 205 #endif
 206         G.max_print_depth = INT_MAX;
 207
 208         /* Note: SUSv3 specifies that -a and -s options cannot be used together
 209          * in strictly conforming applications.  However, it also says that some
 210          * du implementations may produce output when -a and -s are used together.
 211          * gnu du exits with an error code in this case.  We choose to simply
 212          * ignore -a.  This is consistent with -s being equivalent to -d 0.
 213          */
 214 #if ENABLE_FEATURE_HUMAN_READABLE
 215         opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
 216         opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
 217         argv += optind;
 218         if (opt & OPT_h_for_humans) {
 219                 G.disp_hr = 0;
 220         }
 221         if (opt & OPT_m_mbytes) {
 222                 G.disp_hr = 1024*1024;
 223         }
 224         if (opt & OPT_k_kbytes) {
 225                 G.disp_hr = 1024;
 226         }
 227 #else
 228         opt_complementary = "H-L:L-H:s-d:d-s:d+";
 229         opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
 230         argv += optind;
 231 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 232         if (opt & OPT_k_kbytes) {
 233                 G.disp_k = 1;
 234         }
 235 #endif
 236 #endif
 237         if (opt & OPT_H_follow_links) {
 238                 G.slink_depth = 1;
 239         }
 240         if (opt & OPT_L_follow_links) {
 241                 G.slink_depth = INT_MAX;
 242         }
 243         if (opt & OPT_s_total_norecurse) {
 244                 G.max_print_depth = 0;
 245         }
 246
 247         /* go through remaining args (if any) */
 248         if (!*argv) {
 249                 *--argv = (char*)".";
 250                 if (G.slink_depth == 1) {
 251                         G.slink_depth = 0;
 252                 }
 253         }
 254
 255         slink_depth_save = G.slink_depth;
 256         total = 0;
 257         do {
 258                 total += du(*argv);
 259                 /* otherwise du /dir /dir won't show /dir twice: */
 260                 reset_ino_dev_hashtable();
 261                 G.slink_depth = slink_depth_save;
 262         } while (*++argv);
 263
 264         if (opt & OPT_c_total)
 265                 print(total, "total");
 266
 267         fflush_stdout_and_exit(G.status);
 268 }