/* du -- summarize disk usage Copyright (C) 1988-1991, 1995-2005 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* Differences from the Unix du: * Doesn't simply ignore the names of regular files given as arguments when -a is given. By tege@sics.se, Torbjorn Granlund, and djm@ai.mit.edu, David MacKenzie. Variable blocks added by lm@sgi.com and eggert@twinsun.com. Rewritten to use nftw, then to use fts by Jim Meyering. */ #include #include #include #include #include #include "system.h" #include "argmatch.h" #include "dirname.h" /* for strip_trailing_slashes */ #include "error.h" #include "exclude.h" #include "hash.h" #include "human.h" #include "inttostr.h" #include "quote.h" #include "quotearg.h" #include "readtokens0.h" #include "same.h" #include "stat-time.h" #include "strftime.h" #include "xanstrftime.h" #include "xfts.h" #include "xstrtol.h" extern bool fts_debug; /* The official name of this program (e.g., no `g' prefix). */ #define PROGRAM_NAME "du" #define AUTHORS \ "Torbjorn Granlund", "David MacKenzie, Paul Eggert", "Jim Meyering" #if DU_DEBUG # define FTS_CROSS_CHECK(Fts) fts_cross_check (Fts) # define DEBUG_OPT "d" #else # define FTS_CROSS_CHECK(Fts) # define DEBUG_OPT #endif /* Initial size of the hash table. */ #define INITIAL_TABLE_SIZE 103 /* Hash structure for inode and device numbers. The separate entry structure makes it easier to rehash "in place". */ struct entry { ino_t st_ino; dev_t st_dev; }; /* A set of dev/ino pairs. */ static Hash_table *htab; /* Define a class for collecting directory information. */ struct duinfo { /* Size of files in directory. */ uintmax_t size; /* Latest time stamp found. If tmax.tv_sec == TYPE_MINIMUM (time_t) && tmax.tv_nsec < 0, no time stamp has been found. */ struct timespec tmax; }; /* Initialize directory data. */ static inline void duinfo_init (struct duinfo *a) { a->size = 0; a->tmax.tv_sec = TYPE_MINIMUM (time_t); a->tmax.tv_nsec = -1; } /* Set directory data. */ static inline void duinfo_set (struct duinfo *a, uintmax_t size, struct timespec tmax) { a->size = size; a->tmax = tmax; } /* Accumulate directory data. */ static inline void duinfo_add (struct duinfo *a, struct duinfo const *b) { a->size += b->size; if (timespec_cmp (a->tmax, b->tmax) < 0) a->tmax = b->tmax; } /* A structure for per-directory level information. */ struct dulevel { /* Entries in this directory. */ struct duinfo ent; /* Total for subdirectories. */ struct duinfo subdir; }; /* Name under which this program was invoked. */ char *program_name; /* If true, display counts for all files, not just directories. */ static bool opt_all = false; /* If true, rather than using the disk usage of each file, use the apparent size (a la stat.st_size). */ static bool apparent_size = false; /* If true, count each hard link of files with multiple links. */ static bool opt_count_all = false; /* If true, output the NUL byte instead of a newline at the end of each line. */ static bool opt_nul_terminate_output = false; /* If true, print a grand total at the end. */ static bool print_grand_total = false; /* If nonzero, do not add sizes of subdirectories. */ static bool opt_separate_dirs = false; /* Show the total for each directory (and file if --all) that is at most MAX_DEPTH levels down from the root of the hierarchy. The root is at level 0, so `du --max-depth=0' is equivalent to `du -s'. */ static size_t max_depth = SIZE_MAX; /* Human-readable options for output. */ static int human_output_opts; /* If true, print most recently modified date, using the specified format. */ static bool opt_time = false; /* Type of time to display. controlled by --time. */ enum time_type { time_mtime, /* default */ time_ctime, time_atime }; static enum time_type time_type = time_mtime; /* User specified date / time style */ static char const *time_style = NULL; /* Format used to display date / time. Controlled by --time-style */ static char const *time_format = NULL; /* The units to use when printing sizes. */ static uintmax_t output_block_size; /* File name patterns to exclude. */ static struct exclude *exclude; /* Grand total size of all args, in bytes. Also latest modified date. */ static struct duinfo tot_dui; #define IS_DIR_TYPE(Type) \ ((Type) == FTS_DP \ || (Type) == FTS_DNR) /* For long options that have no equivalent short option, use a non-character as a pseudo short option, starting with CHAR_MAX + 1. */ enum { APPARENT_SIZE_OPTION = CHAR_MAX + 1, EXCLUDE_OPTION, FILES0_FROM_OPTION, HUMAN_SI_OPTION, MAX_DEPTH_OPTION, TIME_OPTION, TIME_STYLE_OPTION }; static struct option const long_options[] = { {"all", no_argument, NULL, 'a'}, {"apparent-size", no_argument, NULL, APPARENT_SIZE_OPTION}, {"block-size", required_argument, NULL, 'B'}, {"bytes", no_argument, NULL, 'b'}, {"count-links", no_argument, NULL, 'l'}, {"dereference", no_argument, NULL, 'L'}, {"dereference-args", no_argument, NULL, 'D'}, {"exclude", required_argument, NULL, EXCLUDE_OPTION}, {"exclude-from", required_argument, NULL, 'X'}, {"files0-from", required_argument, NULL, FILES0_FROM_OPTION}, {"human-readable", no_argument, NULL, 'h'}, {"si", no_argument, NULL, HUMAN_SI_OPTION}, {"kilobytes", no_argument, NULL, 'k'}, /* long form is obsolescent */ {"max-depth", required_argument, NULL, MAX_DEPTH_OPTION}, {"null", no_argument, NULL, '0'}, {"megabytes", no_argument, NULL, 'm'}, /* obsolescent */ {"no-dereference", no_argument, NULL, 'P'}, {"one-file-system", no_argument, NULL, 'x'}, {"separate-dirs", no_argument, NULL, 'S'}, {"summarize", no_argument, NULL, 's'}, {"total", no_argument, NULL, 'c'}, {"time", optional_argument, NULL, TIME_OPTION}, {"time-style", required_argument, NULL, TIME_STYLE_OPTION}, {GETOPT_HELP_OPTION_DECL}, {GETOPT_VERSION_OPTION_DECL}, {NULL, 0, NULL, 0} }; static char const *const time_args[] = { "atime", "access", "use", "ctime", "status", NULL }; static enum time_type const time_types[] = { time_atime, time_atime, time_atime, time_ctime, time_ctime }; ARGMATCH_VERIFY (time_args, time_types); /* `full-iso' uses full ISO-style dates and times. `long-iso' uses longer ISO-style time stamps, though shorter than `full-iso'. `iso' uses shorter ISO-style time stamps. */ enum time_style { full_iso_time_style, /* --time-style=full-iso */ long_iso_time_style, /* --time-style=long-iso */ iso_time_style /* --time-style=iso */ }; static char const *const time_style_args[] = { "full-iso", "long-iso", "iso", NULL }; static enum time_style const time_style_types[] = { full_iso_time_style, long_iso_time_style, iso_time_style }; ARGMATCH_VERIFY (time_style_args, time_style_types); void usage (int status) { if (status != EXIT_SUCCESS) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("\ Usage: %s [OPTION]... [FILE]...\n\ or: %s [OPTION]... --files0-from=F\n\ "), program_name, program_name); fputs (_("\ Summarize disk usage of each FILE, recursively for directories.\n\ \n\ "), stdout); fputs (_("\ Mandatory arguments to long options are mandatory for short options too.\n\ "), stdout); fputs (_("\ -a, --all write counts for all files, not just directories\n\ --apparent-size print apparent sizes, rather than disk usage; although\n\ the apparent size is usually smaller, it may be\n\ larger due to holes in (`sparse') files, internal\n\ fragmentation, indirect blocks, and the like\n\ -B, --block-size=SIZE use SIZE-byte blocks\n\ -b, --bytes equivalent to `--apparent-size --block-size=1'\n\ -c, --total produce a grand total\n\ -D, --dereference-args dereference FILEs that are symbolic links\n\ "), stdout); fputs (_("\ --files0-from=F summarize disk usage of the NUL-terminated file\n\ names specified in file F\n\ -H like --si, but also evokes a warning; will soon\n\ change to be equivalent to --dereference-args (-D)\n\ -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)\n\ --si like -h, but use powers of 1000 not 1024\n\ -k like --block-size=1K\n\ -l, --count-links count sizes many times if hard linked\n\ "), stdout); fputs (_("\ -L, --dereference dereference all symbolic links\n\ -P, --no-dereference don't follow any symbolic links (this is the default)\n\ -0, --null end each output line with 0 byte rather than newline\n\ -S, --separate-dirs do not include size of subdirectories\n\ -s, --summarize display only a total for each argument\n\ "), stdout); fputs (_("\ -x, --one-file-system skip directories on different file systems\n\ -X FILE, --exclude-from=FILE Exclude files that match any pattern in FILE.\n\ --exclude=PATTERN Exclude files that match PATTERN.\n\ --max-depth=N print the total for a directory (or file, with --all)\n\ only if it is N or fewer levels below the command\n\ line argument; --max-depth=0 is the same as\n\ --summarize\n\ "), stdout); fputs (_("\ --time show time of the last modification of any file in the\n\ directory, or any of its subdirectories\n\ --time=WORD show time as WORD instead of modification time:\n\ atime, access, use, ctime or status\n\ --time-style=STYLE show times using style STYLE:\n\ full-iso, long-iso, iso, +FORMAT\n\ FORMAT is interpreted like `date'\n\ "), stdout); fputs (HELP_OPTION_DESCRIPTION, stdout); fputs (VERSION_OPTION_DESCRIPTION, stdout); fputs (_("\n\ SIZE may be (or may be an integer optionally followed by) one of following:\n\ kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.\n\ "), stdout); printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); } exit (status); } static size_t entry_hash (void const *x, size_t table_size) { struct entry const *p = x; /* Ignoring the device number here should be fine. */ /* The cast to uintmax_t prevents negative remainders if st_ino is negative. */ return (uintmax_t) p->st_ino % table_size; } /* Compare two dev/ino pairs. Return true if they are the same. */ static bool entry_compare (void const *x, void const *y) { struct entry const *a = x; struct entry const *b = y; return SAME_INODE (*a, *b) ? true : false; } /* Try to insert the INO/DEV pair into the global table, HTAB. Return true if the pair is successfully inserted, false if the pair is already in the table. */ static bool hash_ins (ino_t ino, dev_t dev) { struct entry *ent; struct entry *ent_from_table; ent = xmalloc (sizeof *ent); ent->st_ino = ino; ent->st_dev = dev; ent_from_table = hash_insert (htab, ent); if (ent_from_table == NULL) { /* Insertion failed due to lack of memory. */ xalloc_die (); } if (ent_from_table == ent) { /* Insertion succeeded. */ return true; } /* That pair is already in the table, so ENT was not inserted. Free it. */ free (ent); return false; } /* Initialize the hash table. */ static void hash_init (void) { htab = hash_initialize (INITIAL_TABLE_SIZE, NULL, entry_hash, entry_compare, free); if (htab == NULL) xalloc_die (); } /* FIXME: this code is nearly identical to code in date.c */ /* Display the date and time in WHEN according to the format specified in TIME_FORMAT. If TIME_FORMAT is NULL, use the standard output format. Return zero if successful. */ static void show_date (const char *format, struct timespec when) { char *out; struct tm *tm = localtime (&when.tv_sec); if (! tm) { char buf[INT_BUFSIZE_BOUND (intmax_t)]; error (0, 0, _("time %s is out of range"), (TYPE_SIGNED (time_t) ? imaxtostr (when.tv_sec, buf) : umaxtostr (when.tv_sec, buf))); fputs (buf, stdout); return; } out = xanstrftime (format, tm, 0, when.tv_nsec); fputs (out, stdout); free (out); } /* Print N_BYTES. Convert it to a readable value before printing. */ static void print_only_size (uintmax_t n_bytes) { char buf[LONGEST_HUMAN_READABLE + 1]; fputs (human_readable (n_bytes, buf, human_output_opts, 1, output_block_size), stdout); } /* Print size (and optionally time) indicated by *PDUI, followed by STRING. */ static void print_size (const struct duinfo *pdui, const char *string) { print_only_size (pdui->size); if (opt_time) { putchar ('\t'); show_date (time_format, pdui->tmax); } printf ("\t%s%c", string, opt_nul_terminate_output ? '\0' : '\n'); fflush (stdout); } /* This function is called once for every file system object that fts encounters. fts does a depth-first traversal. This function knows that and accumulates per-directory totals based on changes in the depth of the current entry. It returns true on success. */ static bool process_file (FTS *fts, FTSENT *ent) { bool ok; struct duinfo dui; struct duinfo dui_to_print; size_t level; static size_t prev_level; static size_t n_alloc; /* First element of the structure contains: The sum of the st_size values of all entries in the single directory at the corresponding level. Although this does include the st_size corresponding to each subdirectory, it does not include the size of any file in a subdirectory. Also corresponding last modified date. Second element of the structure contains: The sum of the sizes of all entries in the hierarchy at or below the directory at the specified level. */ static struct dulevel *dulvl; bool print = true; const char *file = ent->fts_path; const struct stat *sb = ent->fts_statp; bool skip; /* If necessary, set FTS_SKIP before returning. */ skip = excluded_file_name (exclude, ent->fts_path); if (skip) fts_set (fts, ent, FTS_SKIP); switch (ent->fts_info) { case FTS_NS: error (0, ent->fts_errno, _("cannot access %s"), quote (file)); return false; case FTS_ERR: /* if (S_ISDIR (ent->fts_statp->st_mode) && FIXME */ error (0, ent->fts_errno, _("%s"), quote (file)); return false; case FTS_DNR: /* Don't return just yet, since although the directory is not readable, we were able to stat it, so we do have a size. */ error (0, ent->fts_errno, _("cannot read directory %s"), quote (file)); ok = false; break; default: ok = true; break; } /* If this is the first (pre-order) encounter with a directory, or if it's the second encounter for a skipped directory, then return right away. */ if (ent->fts_info == FTS_D || skip) return ok; /* If the file is being excluded or if it has already been counted via a hard link, then don't let it contribute to the sums. */ if (skip || (!opt_count_all && ! S_ISDIR (sb->st_mode) && 1 < sb->st_nlink && ! hash_ins (sb->st_ino, sb->st_dev))) { /* Note that we must not simply return here. We still have to update prev_level and maybe propagate some sums up the hierarchy. */ duinfo_init (&dui); print = false; } else { duinfo_set (&dui, (apparent_size ? sb->st_size : ST_NBLOCKS (*sb) * ST_NBLOCKSIZE), (time_type == time_mtime ? get_stat_mtime (sb) : time_type == time_atime ? get_stat_atime (sb) : get_stat_ctime (sb))); } level = ent->fts_level; dui_to_print = dui; if (n_alloc == 0) { n_alloc = level + 10; dulvl = xcalloc (n_alloc, sizeof *dulvl); } else { if (level == prev_level) { /* This is usually the most common case. Do nothing. */ } else if (level > prev_level) { /* Descending the hierarchy. Clear the accumulators for *all* levels between prev_level and the current one. The depth may change dramatically, e.g., from 1 to 10. */ size_t i; if (n_alloc <= level) { dulvl = xnrealloc (dulvl, level, 2 * sizeof *dulvl); n_alloc = level * 2; } for (i = prev_level + 1; i <= level; i++) { duinfo_init (&dulvl[i].ent); duinfo_init (&dulvl[i].subdir); } } else /* level < prev_level */ { /* Ascending the hierarchy. Process a directory only after all entries in that directory have been processed. When the depth decreases, propagate sums from the children (prev_level) to the parent. Here, the current level is always one smaller than the previous one. */ assert (level == prev_level - 1); duinfo_add (&dui_to_print, &dulvl[prev_level].ent); if (!opt_separate_dirs) duinfo_add (&dui_to_print, &dulvl[prev_level].subdir); duinfo_add (&dulvl[level].subdir, &dulvl[prev_level].ent); duinfo_add (&dulvl[level].subdir, &dulvl[prev_level].subdir); } } prev_level = level; /* Let the size of a directory entry contribute to the total for the containing directory, unless --separate-dirs (-S) is specified. */ if ( ! (opt_separate_dirs && IS_DIR_TYPE (ent->fts_info))) duinfo_add (&dulvl[level].ent, &dui); /* Even if this directory is unreadable or we can't chdir into it, do let its size contribute to the total, ... */ duinfo_add (&tot_dui, &dui); /* ... but don't print out a total for it, since without the size(s) of any potential entries, it could be very misleading. */ if (ent->fts_info == FTS_DNR) return ok; /* If we're not counting an entry, e.g., because it's a hard link to a file we've already counted (and --count-links), then don't print a line for it. */ if (!print) return ok; if ((IS_DIR_TYPE (ent->fts_info) && level <= max_depth) || ((opt_all && level <= max_depth) || level == 0)) print_size (&dui_to_print, file); return ok; } /* Recursively print the sizes of the directories (and, if selected, files) named in FILES, the last entry of which is NULL. BIT_FLAGS controls how fts works. Return true if successful. */ static bool du_files (char **files, int bit_flags) { bool ok = true; if (*files) { FTS *fts = xfts_open (files, bit_flags, NULL); while (1) { FTSENT *ent; ent = fts_read (fts); if (ent == NULL) { if (errno != 0) { /* FIXME: try to give a better message */ error (0, errno, _("fts_read failed")); ok = false; } break; } FTS_CROSS_CHECK (fts); ok &= process_file (fts, ent); } /* Ignore failure, since the only way it can do so is in failing to return to the original directory, and since we're about to exit, that doesn't matter. */ fts_close (fts); } if (print_grand_total) print_size (&tot_dui, _("total")); return ok; } int main (int argc, char **argv) { int c; char *cwd_only[2]; bool max_depth_specified = false; char **files; bool ok = true; char *files_from = NULL; struct Tokens tok; /* Bit flags that control how fts works. */ int bit_flags = FTS_PHYSICAL | FTS_TIGHT_CYCLE_CHECK; /* If true, display only a total for each argument. */ bool opt_summarize_only = false; cwd_only[0] = "."; cwd_only[1] = NULL; initialize_main (&argc, &argv); program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); atexit (close_stdout); exclude = new_exclude (); human_output_opts = human_options (getenv ("DU_BLOCK_SIZE"), false, &output_block_size); while ((c = getopt_long (argc, argv, DEBUG_OPT "0abchHklmsxB:DLPSX:", long_options, NULL)) != -1) { switch (c) { #if DU_DEBUG case 'd': fts_debug = true; break; #endif case '0': opt_nul_terminate_output = true; break; case 'a': opt_all = true; break; case APPARENT_SIZE_OPTION: apparent_size = true; break; case 'b': apparent_size = true; human_output_opts = 0; output_block_size = 1; break; case 'c': print_grand_total = true; break; case 'h': human_output_opts = human_autoscale | human_SI | human_base_1024; output_block_size = 1; break; case 'H': error (0, 0, _("WARNING: use --si, not -H; the meaning of the -H\ option will soon\nchange to be the same as that of --dereference-args (-D)")); /* fall through */ case HUMAN_SI_OPTION: human_output_opts = human_autoscale | human_SI; output_block_size = 1; break; case 'k': human_output_opts = 0; output_block_size = 1024; break; case MAX_DEPTH_OPTION: /* --max-depth=N */ { unsigned long int tmp_ulong; if (xstrtoul (optarg, NULL, 0, &tmp_ulong, NULL) == LONGINT_OK && tmp_ulong <= SIZE_MAX) { max_depth_specified = true; max_depth = tmp_ulong; } else { error (0, 0, _("invalid maximum depth %s"), quote (optarg)); ok = false; } } break; case 'm': /* obsolescent: FIXME: remove in 2005. */ human_output_opts = 0; output_block_size = 1024 * 1024; break; case 'l': opt_count_all = true; break; case 's': opt_summarize_only = true; break; case 'x': bit_flags |= FTS_XDEV; break; case 'B': human_output_opts = human_options (optarg, true, &output_block_size); break; case 'D': /* This will eventually be 'H' (-H), too. */ bit_flags = FTS_COMFOLLOW; break; case 'L': /* --dereference */ bit_flags = FTS_LOGICAL; break; case 'P': /* --no-dereference */ bit_flags = FTS_PHYSICAL; break; case 'S': opt_separate_dirs = true; break; case 'X': if (add_exclude_file (add_exclude, exclude, optarg, EXCLUDE_WILDCARDS, '\n')) { error (0, errno, "%s", quotearg_colon (optarg)); ok = false; } break; case FILES0_FROM_OPTION: files_from = optarg; break; case EXCLUDE_OPTION: add_exclude (exclude, optarg, EXCLUDE_WILDCARDS); break; case TIME_OPTION: opt_time = true; time_type = (optarg ? XARGMATCH ("--time", optarg, time_args, time_types) : time_mtime); break; case TIME_STYLE_OPTION: time_style = optarg; break; case_GETOPT_HELP_CHAR; case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); default: ok = false; } } if (!ok) usage (EXIT_FAILURE); if (opt_all & opt_summarize_only) { error (0, 0, _("cannot both summarize and show all entries")); usage (EXIT_FAILURE); } if (opt_summarize_only && max_depth_specified && max_depth == 0) { error (0, 0, _("warning: summarizing is the same as using --max-depth=0")); } if (opt_summarize_only && max_depth_specified && max_depth != 0) { unsigned long int d = max_depth; error (0, 0, _("warning: summarizing conflicts with --max-depth=%lu"), d); usage (EXIT_FAILURE); } if (opt_summarize_only) max_depth = 0; /* Process time style if printing last times. */ if (opt_time) { if (! time_style) { time_style = getenv ("TIME_STYLE"); /* Ignore TIMESTYLE="locale", for compatibility with ls. */ if (! time_style || STREQ (time_style, "locale")) time_style = "long-iso"; else if (*time_style == '+') { /* Ignore anything after a newline, for compatibility with ls. */ char *p = strchr (time_style, '\n'); if (p) *p = '\0'; } else { /* Ignore "posix-" prefix, for compatibility with ls. */ static char const posix_prefix[] = "posix-"; while (strncmp (time_style, posix_prefix, sizeof posix_prefix - 1) == 0) time_style += sizeof posix_prefix - 1; } } if (*time_style == '+') time_format = time_style + 1; else { switch (XARGMATCH ("time style", time_style, time_style_args, time_style_types)) { case full_iso_time_style: time_format = "%Y-%m-%d %H:%M:%S.%N %z"; break; case long_iso_time_style: time_format = "%Y-%m-%d %H:%M"; break; case iso_time_style: time_format = "%Y-%m-%d"; break; } } } if (files_from) { /* When using --files0-from=F, you may not specify any files on the command-line. */ if (optind < argc) { error (0, 0, _("extra operand %s"), quote (argv[optind])); fprintf (stderr, "%s\n", _("File operands cannot be combined with --files0-from.")); usage (EXIT_FAILURE); } if (! (STREQ (files_from, "-") || freopen (files_from, "r", stdin))) error (EXIT_FAILURE, errno, _("cannot open %s for reading"), quote (files_from)); readtokens0_init (&tok); if (! readtokens0 (stdin, &tok) || fclose (stdin) != 0) error (EXIT_FAILURE, 0, _("cannot read file names from %s"), quote (files_from)); files = tok.tok; } else { files = (optind < argc ? argv + optind : cwd_only); } /* Initialize the hash structure for inode numbers. */ hash_init (); /* Report and filter out any empty file names before invoking fts. This works around a glitch in fts, which fails immediately (without looking at the other file names) when given an empty file name. */ { size_t i = 0; size_t j; for (j = 0; ; j++) { if (i != j) files[i] = files[j]; if ( ! files[i]) break; if (files[i][0]) i++; else { if (files_from) { /* Using the standard `filename:line-number:' prefix here is not totally appropriate, since NUL is the separator, not NL, but it might be better than nothing. */ unsigned long int file_number = j + 1; error (0, 0, "%s:%lu: %s", quotearg_colon (files_from), file_number, _("invalid zero-length file name")); } else error (0, 0, "%s", _("invalid zero-length file name")); } } ok = (i == j); } ok &= du_files (files, bit_flags); /* This isn't really necessary, but it does ensure we exercise this function. */ if (files_from) readtokens0_free (&tok); hash_free (htab); exit (ok ? EXIT_SUCCESS : EXIT_FAILURE); }