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
  92
  93 static void print(unsigned long size, const char *filename)
  94 {
  95         /* TODO - May not want to defer error checking here. */
  96 #if ENABLE_FEATURE_HUMAN_READABLE
  97         printf("%s\t%s\n",
  98                         /* size x 512 / G.disp_hr, show one fractional,
  99                          * use suffixes if G.disp_hr == 0 */
 100                         make_human_readable_str(size, 512, G.disp_hr),
 101                         filename);
 102 #else
 103         if (G.disp_k) {
 104                 size++;
 105                 size >>= 1;
 106         }
 107         printf("%lu\t%s\n", size, filename);
 108 #endif
 109 }
 110
 111 /* tiny recursive du */
 112 static unsigned long du(const char *filename)
 113 {
 114         struct stat statbuf;
 115         unsigned long sum;
 116
 117         if (lstat(filename, &statbuf) != 0) {
 118                 bb_simple_perror_msg(filename);
 119                 G.status = EXIT_FAILURE;
 120                 return 0;
 121         }
 122
 123         if (option_mask32 & OPT_x_one_FS) {
 124                 if (G.du_depth == 0) {
 125                         G.dir_dev = statbuf.st_dev;
 126                 } else if (G.dir_dev != statbuf.st_dev) {
 127                         return 0;
 128                 }
 129         }
 130
 131         sum = statbuf.st_blocks;
 132
 133         if (S_ISLNK(statbuf.st_mode)) {
 134                 if (G.slink_depth > G.du_depth) { /* -H or -L */
 135                         if (stat(filename, &statbuf) != 0) {
 136                                 bb_simple_perror_msg(filename);
 137                                 G.status = EXIT_FAILURE;
 138                                 return 0;
 139                         }
 140                         sum = statbuf.st_blocks;
 141                         if (G.slink_depth == 1) {
 142                                 /* Convert -H to -L */
 143                                 G.slink_depth = INT_MAX;
 144                         }
 145                 }
 146         }
 147
 148         if (!(option_mask32 & OPT_l_hardlinks)
 149          && statbuf.st_nlink > 1
 150         ) {
 151                 /* Add files/directories with links only once */
 152                 if (is_in_ino_dev_hashtable(&statbuf)) {
 153                         return 0;
 154                 }
 155                 add_to_ino_dev_hashtable(&statbuf, NULL);
 156         }
 157
 158         if (S_ISDIR(statbuf.st_mode)) {
 159                 DIR *dir;
 160                 struct dirent *entry;
 161                 char *newfile;
 162
 163                 dir = warn_opendir(filename);
 164                 if (!dir) {
 165                         G.status = EXIT_FAILURE;
 166                         return sum;
 167                 }
 168
 169                 while ((entry = readdir(dir))) {
 170                         newfile = concat_subpath_file(filename, entry->d_name);
 171                         if (newfile == NULL)
 172                                 continue;
 173                         ++G.du_depth;
 174                         sum += du(newfile);
 175                         --G.du_depth;
 176                         free(newfile);
 177                 }
 178                 closedir(dir);
 179         } else {
 180                 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
 181                         return sum;
 182         }
 183         if (G.du_depth <= G.max_print_depth) {
 184                 print(sum, filename);
 185         }
 186         return sum;
 187 }
 188
 189 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 190 int du_main(int argc UNUSED_PARAM, char **argv)
 191 {
 192         unsigned long total;
 193         int slink_depth_save;
 194         unsigned opt;
 195
 196 #if ENABLE_FEATURE_HUMAN_READABLE
 197         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
 198         IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
 199         if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
 200                 G.disp_hr = 512;
 201 #else
 202         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
 203         /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
 204 #endif
 205         G.max_print_depth = INT_MAX;
 206
 207         /* Note: SUSv3 specifies that -a and -s options cannot be used together
 208          * in strictly conforming applications.  However, it also says that some
 209          * du implementations may produce output when -a and -s are used together.
 210          * gnu du exits with an error code in this case.  We choose to simply
 211          * ignore -a.  This is consistent with -s being equivalent to -d 0.
 212          */
 213 #if ENABLE_FEATURE_HUMAN_READABLE
 214         opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
 215         opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
 216         argv += optind;
 217         if (opt & OPT_h_for_humans) {
 218                 G.disp_hr = 0;
 219         }
 220         if (opt & OPT_m_mbytes) {
 221                 G.disp_hr = 1024*1024;
 222         }
 223         if (opt & OPT_k_kbytes) {
 224                 G.disp_hr = 1024;
 225         }
 226 #else
 227         opt_complementary = "H-L:L-H:s-d:d-s:d+";
 228         opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
 229         argv += optind;
 230 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 231         if (opt & OPT_k_kbytes) {
 232                 G.disp_k = 1;
 233         }
 234 #endif
 235 #endif
 236         if (opt & OPT_H_follow_links) {
 237                 G.slink_depth = 1;
 238         }
 239         if (opt & OPT_L_follow_links) {
 240                 G.slink_depth = INT_MAX;
 241         }
 242         if (opt & OPT_s_total_norecurse) {
 243                 G.max_print_depth = 0;
 244         }
 245
 246         /* go through remaining args (if any) */
 247         if (!*argv) {
 248                 *--argv = (char*)".";
 249                 if (G.slink_depth == 1) {
 250                         G.slink_depth = 0;
 251                 }
 252         }
 253
 254         slink_depth_save = G.slink_depth;
 255         total = 0;
 256         do {
 257                 total += du(*argv);
 258                 /* otherwise du /dir /dir won't show /dir twice: */
 259                 reset_ino_dev_hashtable();
 260                 G.slink_depth = slink_depth_save;
 261         } while (*++argv);
 262
 263         if (opt & OPT_c_total)
 264                 print(total, "total");
 265
 266         fflush_stdout_and_exit(G.status);
 267 }