/* du -- summarize disk usage
Copyright (C) 1988-1991, 1995-2009 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 3 of the License, 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, see . */
/* 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 "argv-iter.h"
#include "error.h"
#include "exclude.h"
#include "fprintftime.h"
#include "hash.h"
#include "human.h"
#include "quote.h"
#include "quotearg.h"
#include "same.h"
#include "stat-time.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 \
proper_name_utf8 ("Torbjorn Granlund", "Torbj\303\266rn Granlund"), \
proper_name ("David MacKenzie"), \
proper_name ("Paul Eggert"), \
proper_name ("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;
};
/* 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,
MEGABYTES_LONG_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},
{"max-depth", required_argument, NULL, MAX_DEPTH_OPTION},
{"null", no_argument, NULL, '0'},
{"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\
"), stdout);
fputs (_("\
-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 only symlinks that are listed on the\n\
command line\n\
"), stdout);
fputs (_("\
--files0-from=F summarize disk usage of the NUL-terminated file\n\
names specified in file F;\n\
If F is - then read names from standard input\n\
-H 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\
"), stdout);
fputs (_("\
-k like --block-size=1K\n\
-l, --count-links count sizes many times if hard linked\n\
-m like --block-size=1M\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, --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);
emit_bug_reporting_address ();
}
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 FORMAT. */
static void
show_date (const char *format, struct timespec when)
{
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"), timetostr (when.tv_sec, buf));
fputs (buf, stdout);
return;
}
fprintftime (stdout, format, tm, 0, when.tv_nsec);
}
/* 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, file);
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
: (uintmax_t) 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);
/* 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);
}
return ok;
}
int
main (int argc, char **argv)
{
char *cwd_only[2];
bool max_depth_specified = false;
bool ok = true;
char *files_from = NULL;
/* Bit flags that control how fts works. */
int bit_flags = FTS_TIGHT_CYCLE_CHECK | FTS_DEFER_STAT;
/* Select one of the three FTS_ options that control if/when
to follow a symlink. */
int symlink_deref_bits = FTS_PHYSICAL;
/* If true, display only a total for each argument. */
bool opt_summarize_only = false;
cwd_only[0] = bad_cast (".");
cwd_only[1] = NULL;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
exclude = new_exclude ();
human_options (getenv ("DU_BLOCK_SIZE"),
&human_output_opts, &output_block_size);
for (;;)
{
int oi = -1;
int c = getopt_long (argc, argv, DEBUG_OPT "0abchHklmsxB:DLPSX:",
long_options, &oi);
if (c == -1)
break;
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 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 MEGABYTES_LONG_OPTION: /* FIXME: remove in 2009 */
error (0, 0,
_("the --megabytes option is deprecated; use -m instead"));
/* fall through */
case 'm':
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':
{
enum strtol_error e = human_options (optarg, &human_output_opts,
&output_block_size);
if (e != LONGINT_OK)
xstrtol_fatal (e, oi, c, long_options, optarg);
}
break;
case 'H': /* NOTE: before 2008-12, -H was equivalent to --si. */
case 'D':
symlink_deref_bits = FTS_COMFOLLOW | FTS_PHYSICAL;
break;
case 'L': /* --dereference */
symlink_deref_bits = FTS_LOGICAL;
break;
case 'P': /* --no-dereference */
symlink_deref_bits = 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;
}
}
}
struct argv_iterator *ai;
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));
ai = argv_iter_init_stream (stdin);
}
else
{
char **files = (optind < argc ? argv + optind : cwd_only);
ai = argv_iter_init_argv (files);
}
if (!ai)
xalloc_die ();
/* Initialize the hash structure for inode numbers. */
hash_init ();
bit_flags |= symlink_deref_bits;
static char *temp_argv[] = { NULL, NULL };
while (true)
{
bool skip_file = false;
enum argv_iter_err ai_err;
char *file_name = argv_iter (ai, &ai_err);
if (ai_err == AI_ERR_EOF)
break;
if (!file_name)
{
switch (ai_err)
{
case AI_ERR_READ:
error (0, errno, _("%s: read error"), quote (files_from));
skip_file = true;
continue;
case AI_ERR_MEM:
xalloc_die ();
default:
assert (!"unexpected error code from argv_iter");
}
}
if (files_from && STREQ (files_from, "-") && STREQ (file_name, "-"))
{
/* Give a better diagnostic in an unusual case:
printf - | du --files0-from=- */
error (0, 0, _("when reading file names from stdin, "
"no file name of %s allowed"),
quote (file_name));
skip_file = true;
}
/* Report and skip 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. */
if (!file_name[0])
{
/* Diagnose a zero-length file name. When it's one
among many, knowing the record number may help.
FIXME: currently print the record number only with
--files0-from=FILE. Maybe do it for argv, too? */
if (files_from == NULL)
error (0, 0, "%s", _("invalid zero-length file name"));
else
{
/* 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 = argv_iter_n_args (ai);
error (0, 0, "%s:%lu: %s", quotearg_colon (files_from),
file_number, _("invalid zero-length file name"));
}
skip_file = true;
}
if (skip_file)
ok = false;
else
{
temp_argv[0] = file_name;
ok &= du_files (temp_argv, bit_flags);
}
}
argv_iter_free (ai);
if (files_from && (ferror (stdin) || fclose (stdin) != 0))
error (EXIT_FAILURE, 0, _("error reading %s"), quote (files_from));
if (print_grand_total)
print_size (&tot_dui, _("total"));
hash_free (htab);
exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
}