src/du.c

   1 /* du -- summarize disk usage
   2    Copyright (C) 1988-1991, 1995-2010 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Differences from the Unix du:
  18    * Doesn't simply ignore the names of regular files given as arguments
  19      when -a is given.
  20
  21    By tege@sics.se, Torbjorn Granlund,
  22    and djm@ai.mit.edu, David MacKenzie.
  23    Variable blocks added by lm@sgi.com and eggert@twinsun.com.
  24    Rewritten to use nftw, then to use fts by Jim Meyering.  */
  25
  26 #include <config.h>
  27 #include <getopt.h>
  28 #include <sys/types.h>
  29 #include <assert.h>
  30 #include "system.h"
  31 #include "argmatch.h"
  32 #include "argv-iter.h"
  33 #include "di-set.h"
  34 #include "error.h"
  35 #include "exclude.h"
  36 #include "fprintftime.h"
  37 #include "human.h"
  38 #include "quote.h"
  39 #include "quotearg.h"
  40 #include "same.h"
  41 #include "stat-time.h"
  42 #include "stdio--.h"
  43 #include "xfts.h"
  44 #include "xstrtol.h"
  45
  46 extern bool fts_debug;
  47
  48 /* The official name of this program (e.g., no `g' prefix).  */
  49 #define PROGRAM_NAME "du"
  50
  51 #define AUTHORS \
  52   proper_name_utf8 ("Torbjorn Granlund", "Torbj\303\266rn Granlund"), \
  53   proper_name ("David MacKenzie"), \
  54   proper_name ("Paul Eggert"), \
  55   proper_name ("Jim Meyering")
  56
  57 #if DU_DEBUG
  58 # define FTS_CROSS_CHECK(Fts) fts_cross_check (Fts)
  59 #else
  60 # define FTS_CROSS_CHECK(Fts)
  61 #endif
  62
  63 /* A set of dev/ino pairs.  */
  64 static struct di_set *di_set;
  65
  66 /* Define a class for collecting directory information. */
  67
  68 struct duinfo
  69 {
  70   /* Size of files in directory.  */
  71   uintmax_t size;
  72
  73   /* Latest time stamp found.  If tmax.tv_sec == TYPE_MINIMUM (time_t)
  74      && tmax.tv_nsec < 0, no time stamp has been found.  */
  75   struct timespec tmax;
  76 };
  77
  78 /* Initialize directory data.  */
  79 static inline void
  80 duinfo_init (struct duinfo *a)
  81 {
  82   a->size = 0;
  83   a->tmax.tv_sec = TYPE_MINIMUM (time_t);
  84   a->tmax.tv_nsec = -1;
  85 }
  86
  87 /* Set directory data.  */
  88 static inline void
  89 duinfo_set (struct duinfo *a, uintmax_t size, struct timespec tmax)
  90 {
  91   a->size = size;
  92   a->tmax = tmax;
  93 }
  94
  95 /* Accumulate directory data.  */
  96 static inline void
  97 duinfo_add (struct duinfo *a, struct duinfo const *b)
  98 {
  99   a->size += b->size;
 100   if (timespec_cmp (a->tmax, b->tmax) < 0)
 101     a->tmax = b->tmax;
 102 }
 103
 104 /* A structure for per-directory level information.  */
 105 struct dulevel
 106 {
 107   /* Entries in this directory.  */
 108   struct duinfo ent;
 109
 110   /* Total for subdirectories.  */
 111   struct duinfo subdir;
 112 };
 113
 114 /* If true, display counts for all files, not just directories.  */
 115 static bool opt_all = false;
 116
 117 /* If true, rather than using the disk usage of each file,
 118    use the apparent size (a la stat.st_size).  */
 119 static bool apparent_size = false;
 120
 121 /* If true, count each hard link of files with multiple links.  */
 122 static bool opt_count_all = false;
 123
 124 /* If true, hash all files to look for hard links.  */
 125 static bool hash_all;
 126
 127 /* If true, output the NUL byte instead of a newline at the end of each line. */
 128 static bool opt_nul_terminate_output = false;
 129
 130 /* If true, print a grand total at the end.  */
 131 static bool print_grand_total = false;
 132
 133 /* If nonzero, do not add sizes of subdirectories.  */
 134 static bool opt_separate_dirs = false;
 135
 136 /* Show the total for each directory (and file if --all) that is at
 137    most MAX_DEPTH levels down from the root of the hierarchy.  The root
 138    is at level 0, so `du --max-depth=0' is equivalent to `du -s'.  */
 139 static size_t max_depth = SIZE_MAX;
 140
 141 /* Human-readable options for output.  */
 142 static int human_output_opts;
 143
 144 /* If true, print most recently modified date, using the specified format.  */
 145 static bool opt_time = false;
 146
 147 /* Type of time to display. controlled by --time.  */
 148
 149 enum time_type
 150   {
 151     time_mtime,                 /* default */
 152     time_ctime,
 153     time_atime
 154   };
 155
 156 static enum time_type time_type = time_mtime;
 157
 158 /* User specified date / time style */
 159 static char const *time_style = NULL;
 160
 161 /* Format used to display date / time. Controlled by --time-style */
 162 static char const *time_format = NULL;
 163
 164 /* The units to use when printing sizes.  */
 165 static uintmax_t output_block_size;
 166
 167 /* File name patterns to exclude.  */
 168 static struct exclude *exclude;
 169
 170 /* Grand total size of all args, in bytes. Also latest modified date. */
 171 static struct duinfo tot_dui;
 172
 173 #define IS_DIR_TYPE(Type)       \
 174   ((Type) == FTS_DP             \
 175    || (Type) == FTS_DNR)
 176
 177 /* For long options that have no equivalent short option, use a
 178    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
 179 enum
 180 {
 181   APPARENT_SIZE_OPTION = CHAR_MAX + 1,
 182   EXCLUDE_OPTION,
 183   FILES0_FROM_OPTION,
 184   HUMAN_SI_OPTION,
 185   FTS_DEBUG,
 186   TIME_OPTION,
 187   TIME_STYLE_OPTION
 188 };
 189
 190 static struct option const long_options[] =
 191 {
 192   {"all", no_argument, NULL, 'a'},
 193   {"apparent-size", no_argument, NULL, APPARENT_SIZE_OPTION},
 194   {"block-size", required_argument, NULL, 'B'},
 195   {"bytes", no_argument, NULL, 'b'},
 196   {"count-links", no_argument, NULL, 'l'},
 197   /* {"-debug", no_argument, NULL, FTS_DEBUG}, */
 198   {"dereference", no_argument, NULL, 'L'},
 199   {"dereference-args", no_argument, NULL, 'D'},
 200   {"exclude", required_argument, NULL, EXCLUDE_OPTION},
 201   {"exclude-from", required_argument, NULL, 'X'},
 202   {"files0-from", required_argument, NULL, FILES0_FROM_OPTION},
 203   {"human-readable", no_argument, NULL, 'h'},
 204   {"si", no_argument, NULL, HUMAN_SI_OPTION},
 205   {"max-depth", required_argument, NULL, 'd'},
 206   {"null", no_argument, NULL, '0'},
 207   {"no-dereference", no_argument, NULL, 'P'},
 208   {"one-file-system", no_argument, NULL, 'x'},
 209   {"separate-dirs", no_argument, NULL, 'S'},
 210   {"summarize", no_argument, NULL, 's'},
 211   {"total", no_argument, NULL, 'c'},
 212   {"time", optional_argument, NULL, TIME_OPTION},
 213   {"time-style", required_argument, NULL, TIME_STYLE_OPTION},
 214   {GETOPT_HELP_OPTION_DECL},
 215   {GETOPT_VERSION_OPTION_DECL},
 216   {NULL, 0, NULL, 0}
 217 };
 218
 219 static char const *const time_args[] =
 220 {
 221   "atime", "access", "use", "ctime", "status", NULL
 222 };
 223 static enum time_type const time_types[] =
 224 {
 225   time_atime, time_atime, time_atime, time_ctime, time_ctime
 226 };
 227 ARGMATCH_VERIFY (time_args, time_types);
 228
 229 /* `full-iso' uses full ISO-style dates and times.  `long-iso' uses longer
 230    ISO-style time stamps, though shorter than `full-iso'.  `iso' uses shorter
 231    ISO-style time stamps.  */
 232 enum time_style
 233   {
 234     full_iso_time_style,       /* --time-style=full-iso */
 235     long_iso_time_style,       /* --time-style=long-iso */
 236     iso_time_style             /* --time-style=iso */
 237   };
 238
 239 static char const *const time_style_args[] =
 240 {
 241   "full-iso", "long-iso", "iso", NULL
 242 };
 243 static enum time_style const time_style_types[] =
 244 {
 245   full_iso_time_style, long_iso_time_style, iso_time_style
 246 };
 247 ARGMATCH_VERIFY (time_style_args, time_style_types);
 248
 249 void
 250 usage (int status)
 251 {
 252   if (status != EXIT_SUCCESS)
 253     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 254              program_name);
 255   else
 256     {
 257       printf (_("\
 258 Usage: %s [OPTION]... [FILE]...\n\
 259   or:  %s [OPTION]... --files0-from=F\n\
 260 "), program_name, program_name);
 261       fputs (_("\
 262 Summarize disk usage of each FILE, recursively for directories.\n\
 263 \n\
 264 "), stdout);
 265       fputs (_("\
 266 Mandatory arguments to long options are mandatory for short options too.\n\
 267 "), stdout);
 268       fputs (_("\
 269   -a, --all             write counts for all files, not just directories\n\
 270       --apparent-size   print apparent sizes, rather than disk usage; although\n\
 271                           the apparent size is usually smaller, it may be\n\
 272                           larger due to holes in (`sparse') files, internal\n\
 273                           fragmentation, indirect blocks, and the like\n\
 274 "), stdout);
 275       fputs (_("\
 276   -B, --block-size=SIZE  scale sizes by SIZE before printing them.  E.g.,\n\
 277                            `-BM' prints sizes in units of 1,048,576 bytes.\n\
 278                            See SIZE format below.\n\
 279   -b, --bytes           equivalent to `--apparent-size --block-size=1'\n\
 280   -c, --total           produce a grand total\n\
 281   -D, --dereference-args  dereference only symlinks that are listed on the\n\
 282                           command line\n\
 283 "), stdout);
 284       fputs (_("\
 285       --files0-from=F   summarize disk usage of the NUL-terminated file\n\
 286                           names specified in file F;\n\
 287                           If F is - then read names from standard input\n\
 288   -H                    equivalent to --dereference-args (-D)\n\
 289   -h, --human-readable  print sizes in human readable format (e.g., 1K 234M 2G)\n\
 290       --si              like -h, but use powers of 1000 not 1024\n\
 291 "), stdout);
 292       fputs (_("\
 293   -k                    like --block-size=1K\n\
 294   -l, --count-links     count sizes many times if hard linked\n\
 295   -m                    like --block-size=1M\n\
 296 "), stdout);
 297       fputs (_("\
 298   -L, --dereference     dereference all symbolic links\n\
 299   -P, --no-dereference  don't follow any symbolic links (this is the default)\n\
 300   -0, --null            end each output line with 0 byte rather than newline\n\
 301   -S, --separate-dirs   do not include size of subdirectories\n\
 302   -s, --summarize       display only a total for each argument\n\
 303 "), stdout);
 304       fputs (_("\
 305   -x, --one-file-system    skip directories on different file systems\n\
 306   -X, --exclude-from=FILE  exclude files that match any pattern in FILE\n\
 307       --exclude=PATTERN    exclude files that match PATTERN\n\
 308   -d, --max-depth=N     print the total for a directory (or file, with --all)\n\
 309                           only if it is N or fewer levels below the command\n\
 310                           line argument;  --max-depth=0 is the same as\n\
 311                           --summarize\n\
 312 "), stdout);
 313       fputs (_("\
 314       --time            show time of the last modification of any file in the\n\
 315                           directory, or any of its subdirectories\n\
 316       --time=WORD       show time as WORD instead of modification time:\n\
 317                           atime, access, use, ctime or status\n\
 318       --time-style=STYLE  show times using style STYLE:\n\
 319                           full-iso, long-iso, iso, +FORMAT\n\
 320                           FORMAT is interpreted like `date'\n\
 321 "), stdout);
 322       fputs (HELP_OPTION_DESCRIPTION, stdout);
 323       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 324       emit_blocksize_note ("DU");
 325       emit_size_note ();
 326       emit_ancillary_info ();
 327     }
 328   exit (status);
 329 }
 330
 331 /* Try to insert the INO/DEV pair into the global table, HTAB.
 332    Return true if the pair is successfully inserted,
 333    false if the pair is already in the table.  */
 334 static bool
 335 hash_ins (ino_t ino, dev_t dev)
 336 {
 337   int inserted = di_set_insert (di_set, dev, ino);
 338   if (inserted < 0)
 339     xalloc_die ();
 340   return inserted;
 341 }
 342
 343 /* FIXME: this code is nearly identical to code in date.c  */
 344 /* Display the date and time in WHEN according to the format specified
 345    in FORMAT.  */
 346
 347 static void
 348 show_date (const char *format, struct timespec when)
 349 {
 350   struct tm *tm = localtime (&when.tv_sec);
 351   if (! tm)
 352     {
 353       char buf[INT_BUFSIZE_BOUND (intmax_t)];
 354       char *when_str = timetostr (when.tv_sec, buf);
 355       error (0, 0, _("time %s is out of range"), when_str);
 356       fputs (when_str, stdout);
 357       return;
 358     }
 359
 360   fprintftime (stdout, format, tm, 0, when.tv_nsec);
 361 }
 362
 363 /* Print N_BYTES.  Convert it to a readable value before printing.  */
 364
 365 static void
 366 print_only_size (uintmax_t n_bytes)
 367 {
 368   char buf[LONGEST_HUMAN_READABLE + 1];
 369   fputs (human_readable (n_bytes, buf, human_output_opts,
 370                          1, output_block_size), stdout);
 371 }
 372
 373 /* Print size (and optionally time) indicated by *PDUI, followed by STRING.  */
 374
 375 static void
 376 print_size (const struct duinfo *pdui, const char *string)
 377 {
 378   print_only_size (pdui->size);
 379   if (opt_time)
 380     {
 381       putchar ('\t');
 382       show_date (time_format, pdui->tmax);
 383     }
 384   printf ("\t%s%c", string, opt_nul_terminate_output ? '\0' : '\n');
 385   fflush (stdout);
 386 }
 387
 388 /* This function is called once for every file system object that fts
 389    encounters.  fts does a depth-first traversal.  This function knows
 390    that and accumulates per-directory totals based on changes in
 391    the depth of the current entry.  It returns true on success.  */
 392
 393 static bool
 394 process_file (FTS *fts, FTSENT *ent)
 395 {
 396   bool ok = true;
 397   struct duinfo dui;
 398   struct duinfo dui_to_print;
 399   size_t level;
 400   static size_t prev_level;
 401   static size_t n_alloc;
 402   /* First element of the structure contains:
 403      The sum of the st_size values of all entries in the single directory
 404      at the corresponding level.  Although this does include the st_size
 405      corresponding to each subdirectory, it does not include the size of
 406      any file in a subdirectory. Also corresponding last modified date.
 407      Second element of the structure contains:
 408      The sum of the sizes of all entries in the hierarchy at or below the
 409      directory at the specified level.  */
 410   static struct dulevel *dulvl;
 411
 412   const char *file = ent->fts_path;
 413   const struct stat *sb = ent->fts_statp;
 414   int info = ent->fts_info;
 415
 416   if (info == FTS_DNR)
 417     {
 418       /* An error occurred, but the size is known, so count it.  */
 419       error (0, ent->fts_errno, _("cannot read directory %s"), quote (file));
 420       ok = false;
 421     }
 422   else if (info != FTS_DP)
 423     {
 424       bool excluded = excluded_file_name (exclude, file);
 425       if (! excluded)
 426         {
 427           /* Make the stat buffer *SB valid, or fail noisily.  */
 428
 429           if (info == FTS_NSOK)
 430             {
 431               fts_set (fts, ent, FTS_AGAIN);
 432               FTSENT const *e = fts_read (fts);
 433               assert (e == ent);
 434               info = ent->fts_info;
 435             }
 436
 437           if (info == FTS_NS || info == FTS_SLNONE)
 438             {
 439               error (0, ent->fts_errno, _("cannot access %s"), quote (file));
 440               return false;
 441             }
 442         }
 443
 444       if (excluded
 445           || (! opt_count_all
 446               && (hash_all || (! S_ISDIR (sb->st_mode) && 1 < sb->st_nlink))
 447               && ! hash_ins (sb->st_ino, sb->st_dev)))
 448         {
 449           /* If ignoring a directory in preorder, skip its children.
 450              Ignore the next fts_read output too, as it's a postorder
 451              visit to the same directory.  */
 452           if (info == FTS_D)
 453             {
 454               fts_set (fts, ent, FTS_SKIP);
 455               FTSENT const *e = fts_read (fts);
 456               assert (e == ent);
 457             }
 458
 459           return true;
 460         }
 461
 462       switch (info)
 463         {
 464         case FTS_D:
 465           return true;
 466
 467         case FTS_ERR:
 468           /* An error occurred, but the size is known, so count it.  */
 469           error (0, ent->fts_errno, "%s", quote (file));
 470           ok = false;
 471           break;
 472
 473         case FTS_DC:
 474           if (cycle_warning_required (fts, ent))
 475             {
 476               emit_cycle_warning (file);
 477               return false;
 478             }
 479           return true;
 480         }
 481     }
 482
 483   duinfo_set (&dui,
 484               (apparent_size
 485                ? sb->st_size
 486                : (uintmax_t) ST_NBLOCKS (*sb) * ST_NBLOCKSIZE),
 487               (time_type == time_mtime ? get_stat_mtime (sb)
 488                : time_type == time_atime ? get_stat_atime (sb)
 489                : get_stat_ctime (sb)));
 490
 491   level = ent->fts_level;
 492   dui_to_print = dui;
 493
 494   if (n_alloc == 0)
 495     {
 496       n_alloc = level + 10;
 497       dulvl = xcalloc (n_alloc, sizeof *dulvl);
 498     }
 499   else
 500     {
 501       if (level == prev_level)
 502         {
 503           /* This is usually the most common case.  Do nothing.  */
 504         }
 505       else if (level > prev_level)
 506         {
 507           /* Descending the hierarchy.
 508              Clear the accumulators for *all* levels between prev_level
 509              and the current one.  The depth may change dramatically,
 510              e.g., from 1 to 10.  */
 511           size_t i;
 512
 513           if (n_alloc <= level)
 514             {
 515               dulvl = xnrealloc (dulvl, level, 2 * sizeof *dulvl);
 516               n_alloc = level * 2;
 517             }
 518
 519           for (i = prev_level + 1; i <= level; i++)
 520             {
 521               duinfo_init (&dulvl[i].ent);
 522               duinfo_init (&dulvl[i].subdir);
 523             }
 524         }
 525       else /* level < prev_level */
 526         {
 527           /* Ascending the hierarchy.
 528              Process a directory only after all entries in that
 529              directory have been processed.  When the depth decreases,
 530              propagate sums from the children (prev_level) to the parent.
 531              Here, the current level is always one smaller than the
 532              previous one.  */
 533           assert (level == prev_level - 1);
 534           duinfo_add (&dui_to_print, &dulvl[prev_level].ent);
 535           if (!opt_separate_dirs)
 536             duinfo_add (&dui_to_print, &dulvl[prev_level].subdir);
 537           duinfo_add (&dulvl[level].subdir, &dulvl[prev_level].ent);
 538           duinfo_add (&dulvl[level].subdir, &dulvl[prev_level].subdir);
 539         }
 540     }
 541
 542   prev_level = level;
 543
 544   /* Let the size of a directory entry contribute to the total for the
 545      containing directory, unless --separate-dirs (-S) is specified.  */
 546   if (! (opt_separate_dirs && IS_DIR_TYPE (info)))
 547     duinfo_add (&dulvl[level].ent, &dui);
 548
 549   /* Even if this directory is unreadable or we can't chdir into it,
 550      do let its size contribute to the total. */
 551   duinfo_add (&tot_dui, &dui);
 552
 553   if ((IS_DIR_TYPE (info) && level <= max_depth)
 554       || ((opt_all && level <= max_depth) || level == 0))
 555     print_size (&dui_to_print, file);
 556
 557   return ok;
 558 }
 559
 560 /* Recursively print the sizes of the directories (and, if selected, files)
 561    named in FILES, the last entry of which is NULL.
 562    BIT_FLAGS controls how fts works.
 563    Return true if successful.  */
 564
 565 static bool
 566 du_files (char **files, int bit_flags)
 567 {
 568   bool ok = true;
 569
 570   if (*files)
 571     {
 572       FTS *fts = xfts_open (files, bit_flags, NULL);
 573
 574       while (1)
 575         {
 576           FTSENT *ent;
 577
 578           ent = fts_read (fts);
 579           if (ent == NULL)
 580             {
 581               if (errno != 0)
 582                 {
 583                   /* FIXME: try to give a better message  */
 584                   error (0, errno, _("fts_read failed"));
 585                   ok = false;
 586                 }
 587               break;
 588             }
 589           FTS_CROSS_CHECK (fts);
 590
 591           ok &= process_file (fts, ent);
 592         }
 593
 594       if (fts_close (fts) != 0)
 595         {
 596           error (0, errno, _("fts_close failed"));
 597           ok = false;
 598         }
 599     }
 600
 601   return ok;
 602 }
 603
 604 int
 605 main (int argc, char **argv)
 606 {
 607   char *cwd_only[2];
 608   bool max_depth_specified = false;
 609   bool ok = true;
 610   char *files_from = NULL;
 611
 612   /* Bit flags that control how fts works.  */
 613   int bit_flags = FTS_NOSTAT;
 614
 615   /* Select one of the three FTS_ options that control if/when
 616      to follow a symlink.  */
 617   int symlink_deref_bits = FTS_PHYSICAL;
 618
 619   /* If true, display only a total for each argument. */
 620   bool opt_summarize_only = false;
 621
 622   cwd_only[0] = bad_cast (".");
 623   cwd_only[1] = NULL;
 624
 625   initialize_main (&argc, &argv);
 626   set_program_name (argv[0]);
 627   setlocale (LC_ALL, "");
 628   bindtextdomain (PACKAGE, LOCALEDIR);
 629   textdomain (PACKAGE);
 630
 631   atexit (close_stdout);
 632
 633   exclude = new_exclude ();
 634
 635   human_options (getenv ("DU_BLOCK_SIZE"),
 636                  &human_output_opts, &output_block_size);
 637
 638   while (true)
 639     {
 640       int oi = -1;
 641       int c = getopt_long (argc, argv, "0abd:chHklmsxB:DLPSX:",
 642                            long_options, &oi);
 643       if (c == -1)
 644         break;
 645
 646       switch (c)
 647         {
 648 #if DU_DEBUG
 649         case FTS_DEBUG:
 650           fts_debug = true;
 651           break;
 652 #endif
 653
 654         case '0':
 655           opt_nul_terminate_output = true;
 656           break;
 657
 658         case 'a':
 659           opt_all = true;
 660           break;
 661
 662         case APPARENT_SIZE_OPTION:
 663           apparent_size = true;
 664           break;
 665
 666         case 'b':
 667           apparent_size = true;
 668           human_output_opts = 0;
 669           output_block_size = 1;
 670           break;
 671
 672         case 'c':
 673           print_grand_total = true;
 674           break;
 675
 676         case 'h':
 677           human_output_opts = human_autoscale | human_SI | human_base_1024;
 678           output_block_size = 1;
 679           break;
 680
 681         case HUMAN_SI_OPTION:
 682           human_output_opts = human_autoscale | human_SI;
 683           output_block_size = 1;
 684           break;
 685
 686         case 'k':
 687           human_output_opts = 0;
 688           output_block_size = 1024;
 689           break;
 690
 691         case 'd':               /* --max-depth=N */
 692           {
 693             unsigned long int tmp_ulong;
 694             if (xstrtoul (optarg, NULL, 0, &tmp_ulong, NULL) == LONGINT_OK
 695                 && tmp_ulong <= SIZE_MAX)
 696               {
 697                 max_depth_specified = true;
 698                 max_depth = tmp_ulong;
 699               }
 700             else
 701               {
 702                 error (0, 0, _("invalid maximum depth %s"),
 703                        quote (optarg));
 704                 ok = false;
 705               }
 706           }
 707           break;
 708
 709         case 'm':
 710           human_output_opts = 0;
 711           output_block_size = 1024 * 1024;
 712           break;
 713
 714         case 'l':
 715           opt_count_all = true;
 716           break;
 717
 718         case 's':
 719           opt_summarize_only = true;
 720           break;
 721
 722         case 'x':
 723           bit_flags |= FTS_XDEV;
 724           break;
 725
 726         case 'B':
 727           {
 728             enum strtol_error e = human_options (optarg, &human_output_opts,
 729                                                  &output_block_size);
 730             if (e != LONGINT_OK)
 731               xstrtol_fatal (e, oi, c, long_options, optarg);
 732           }
 733           break;
 734
 735         case 'H':  /* NOTE: before 2008-12, -H was equivalent to --si.  */
 736         case 'D':
 737           symlink_deref_bits = FTS_COMFOLLOW | FTS_PHYSICAL;
 738           break;
 739
 740         case 'L': /* --dereference */
 741           symlink_deref_bits = FTS_LOGICAL;
 742           break;
 743
 744         case 'P': /* --no-dereference */
 745           symlink_deref_bits = FTS_PHYSICAL;
 746           break;
 747
 748         case 'S':
 749           opt_separate_dirs = true;
 750           break;
 751
 752         case 'X':
 753           if (add_exclude_file (add_exclude, exclude, optarg,
 754                                 EXCLUDE_WILDCARDS, '\n'))
 755             {
 756               error (0, errno, "%s", quotearg_colon (optarg));
 757               ok = false;
 758             }
 759           break;
 760
 761         case FILES0_FROM_OPTION:
 762           files_from = optarg;
 763           break;
 764
 765         case EXCLUDE_OPTION:
 766           add_exclude (exclude, optarg, EXCLUDE_WILDCARDS);
 767           break;
 768
 769         case TIME_OPTION:
 770           opt_time = true;
 771           time_type =
 772             (optarg
 773              ? XARGMATCH ("--time", optarg, time_args, time_types)
 774              : time_mtime);
 775           break;
 776
 777         case TIME_STYLE_OPTION:
 778           time_style = optarg;
 779           break;
 780
 781         case_GETOPT_HELP_CHAR;
 782
 783         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 784
 785         default:
 786           ok = false;
 787         }
 788     }
 789
 790   if (!ok)
 791     usage (EXIT_FAILURE);
 792
 793   if (opt_all && opt_summarize_only)
 794     {
 795       error (0, 0, _("cannot both summarize and show all entries"));
 796       usage (EXIT_FAILURE);
 797     }
 798
 799   if (opt_summarize_only && max_depth_specified && max_depth == 0)
 800     {
 801       error (0, 0,
 802              _("warning: summarizing is the same as using --max-depth=0"));
 803     }
 804
 805   if (opt_summarize_only && max_depth_specified && max_depth != 0)
 806     {
 807       unsigned long int d = max_depth;
 808       error (0, 0, _("warning: summarizing conflicts with --max-depth=%lu"), d);
 809       usage (EXIT_FAILURE);
 810     }
 811
 812   if (opt_summarize_only)
 813     max_depth = 0;
 814
 815   /* Process time style if printing last times.  */
 816   if (opt_time)
 817     {
 818       if (! time_style)
 819         {
 820           time_style = getenv ("TIME_STYLE");
 821
 822           /* Ignore TIMESTYLE="locale", for compatibility with ls.  */
 823           if (! time_style || STREQ (time_style, "locale"))
 824             time_style = "long-iso";
 825           else if (*time_style == '+')
 826             {
 827               /* Ignore anything after a newline, for compatibility
 828                  with ls.  */
 829               char *p = strchr (time_style, '\n');
 830               if (p)
 831                 *p = '\0';
 832             }
 833           else
 834             {
 835               /* Ignore "posix-" prefix, for compatibility with ls.  */
 836               static char const posix_prefix[] = "posix-";
 837               while (strncmp (time_style, posix_prefix, sizeof posix_prefix - 1)
 838                      == 0)
 839                 time_style += sizeof posix_prefix - 1;
 840             }
 841         }
 842
 843       if (*time_style == '+')
 844         time_format = time_style + 1;
 845       else
 846         {
 847           switch (XARGMATCH ("time style", time_style,
 848                              time_style_args, time_style_types))
 849             {
 850             case full_iso_time_style:
 851               time_format = "%Y-%m-%d %H:%M:%S.%N %z";
 852               break;
 853
 854             case long_iso_time_style:
 855               time_format = "%Y-%m-%d %H:%M";
 856               break;
 857
 858             case iso_time_style:
 859               time_format = "%Y-%m-%d";
 860               break;
 861             }
 862         }
 863     }
 864
 865   struct argv_iterator *ai;
 866   if (files_from)
 867     {
 868       /* When using --files0-from=F, you may not specify any files
 869          on the command-line.  */
 870       if (optind < argc)
 871         {
 872           error (0, 0, _("extra operand %s"), quote (argv[optind]));
 873           fprintf (stderr, "%s\n",
 874                    _("file operands cannot be combined with --files0-from"));
 875           usage (EXIT_FAILURE);
 876         }
 877
 878       if (! (STREQ (files_from, "-") || freopen (files_from, "r", stdin)))
 879         error (EXIT_FAILURE, errno, _("cannot open %s for reading"),
 880                quote (files_from));
 881
 882       ai = argv_iter_init_stream (stdin);
 883
 884       /* It's not easy here to count the arguments, so assume the
 885          worst.  */
 886       hash_all = true;
 887     }
 888   else
 889     {
 890       char **files = (optind < argc ? argv + optind : cwd_only);
 891       ai = argv_iter_init_argv (files);
 892
 893       /* Hash all dev,ino pairs if there are multiple arguments, or if
 894          following non-command-line symlinks, because in either case a
 895          file with just one hard link might be seen more than once.  */
 896       hash_all = (optind + 1 < argc || symlink_deref_bits == FTS_LOGICAL);
 897     }
 898
 899   if (!ai)
 900     xalloc_die ();
 901
 902   /* Initialize the set of dev,inode pairs.  */
 903   di_set = di_set_alloc ();
 904   if (!di_set)
 905     xalloc_die ();
 906
 907   /* If not hashing everything, process_file won't find cycles on its
 908      own, so ask fts_read to check for them accurately.  */
 909   if (opt_count_all || ! hash_all)
 910     bit_flags |= FTS_TIGHT_CYCLE_CHECK;
 911
 912   bit_flags |= symlink_deref_bits;
 913   static char *temp_argv[] = { NULL, NULL };
 914
 915   while (true)
 916     {
 917       bool skip_file = false;
 918       enum argv_iter_err ai_err;
 919       char *file_name = argv_iter (ai, &ai_err);
 920       if (ai_err == AI_ERR_EOF)
 921         break;
 922       if (!file_name)
 923         {
 924           switch (ai_err)
 925             {
 926             case AI_ERR_READ:
 927               error (0, errno, _("%s: read error"), quote (files_from));
 928               continue;
 929
 930             case AI_ERR_MEM:
 931               xalloc_die ();
 932
 933             default:
 934               assert (!"unexpected error code from argv_iter");
 935             }
 936         }
 937       if (files_from && STREQ (files_from, "-") && STREQ (file_name, "-"))
 938         {
 939           /* Give a better diagnostic in an unusual case:
 940              printf - | du --files0-from=- */
 941           error (0, 0, _("when reading file names from stdin, "
 942                          "no file name of %s allowed"),
 943                  quote (file_name));
 944           skip_file = true;
 945         }
 946
 947       /* Report and skip any empty file names before invoking fts.
 948          This works around a glitch in fts, which fails immediately
 949          (without looking at the other file names) when given an empty
 950          file name.  */
 951       if (!file_name[0])
 952         {
 953           /* Diagnose a zero-length file name.  When it's one
 954              among many, knowing the record number may help.
 955              FIXME: currently print the record number only with
 956              --files0-from=FILE.  Maybe do it for argv, too?  */
 957           if (files_from == NULL)
 958             error (0, 0, "%s", _("invalid zero-length file name"));
 959           else
 960             {
 961               /* Using the standard `filename:line-number:' prefix here is
 962                  not totally appropriate, since NUL is the separator, not NL,
 963                  but it might be better than nothing.  */
 964               unsigned long int file_number = argv_iter_n_args (ai);
 965               error (0, 0, "%s:%lu: %s", quotearg_colon (files_from),
 966                      file_number, _("invalid zero-length file name"));
 967             }
 968           skip_file = true;
 969         }
 970
 971       if (skip_file)
 972         ok = false;
 973       else
 974         {
 975           temp_argv[0] = file_name;
 976           ok &= du_files (temp_argv, bit_flags);
 977         }
 978     }
 979
 980   argv_iter_free (ai);
 981   di_set_free (di_set);
 982
 983   if (files_from && (ferror (stdin) || fclose (stdin) != 0))
 984     error (EXIT_FAILURE, 0, _("error reading %s"), quote (files_from));
 985
 986   if (print_grand_total)
 987     print_size (&tot_dui, _("total"));
 988
 989   exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
 990 }