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