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|
/* du -- summarize disk usage
Copyright (C) 88, 89, 90, 91, 95, 96, 97, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Differences from the Unix du:
* Doesn't simply ignore the names of regular files given as arguments
when -a is given.
* Additional options:
-l Count the size of all files, even if they have appeared
already in another hard link.
-x Do not cross file-system boundaries during the recursion.
-c Write a grand total of all of the arguments after all
arguments have been processed. This can be used to find
out the disk usage of a directory, with some files excluded.
-h Print sizes in human readable format (1k 234M 2G, etc).
-H Similar, but use powers of 1000 not 1024.
-k Print sizes in kilobytes.
-m Print sizes in megabytes.
-b Print sizes in bytes.
-S Count the size of each directory separately, not including
the sizes of subdirectories.
-D Dereference only symbolic links given on the command line.
-L Dereference all symbolic links.
--exclude=PAT Exclude files that match PAT.
-X FILE Exclude files that match patterns taken from FILE.
By tege@sics.se, Torbjorn Granlund,
and djm@ai.mit.edu, David MacKenzie.
Variable blocks added by lm@sgi.com and eggert@twinsun.com.
*/
#include <config.h>
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include <assert.h>
#include "exclude.h"
#include "system.h"
#include "save-cwd.h"
#include "closeout.h"
#include "error.h"
#include "human.h"
#include "xstrtol.h"
#include "savedir.h"
/* Initial number of entries in each hash table entry's table of inodes. */
#define INITIAL_HASH_MODULE 100
/* Initial number of entries in the inode hash table. */
#define INITIAL_ENTRY_TAB_SIZE 70
/* Initial size to allocate for `path'. */
#define INITIAL_PATH_SIZE 100
/* Hash structure for inode and device numbers. The separate entry
structure makes it easier to rehash "in place". */
struct entry
{
ino_t ino;
dev_t dev;
struct entry *coll_link;
};
/* Structure for a hash table for inode numbers. */
struct htab
{
unsigned modulus; /* Size of the `hash' pointer vector. */
struct entry *entry_tab; /* Pointer to dynamically growing vector. */
unsigned entry_tab_size; /* Size of current `entry_tab' allocation. */
unsigned first_free_entry; /* Index in `entry_tab'. */
struct entry *hash[1]; /* Vector of pointers in `entry_tab'. */
};
/* Structure for dynamically resizable strings. */
struct String
{
unsigned alloc; /* Size of allocation for the text. */
unsigned length; /* Length of the text currently. */
char *text; /* Pointer to the text. */
};
typedef struct String String;
int stat ();
int lstat ();
static int hash_insert PARAMS ((ino_t ino, dev_t dev));
static int hash_insert2 PARAMS ((struct htab *_htab, ino_t ino, dev_t dev));
static uintmax_t count_entry PARAMS ((const char *ent, int top, dev_t last_dev,
int depth));
static void du_files PARAMS ((char **files));
static void hash_init PARAMS ((unsigned int modulus,
unsigned int entry_tab_size));
static void hash_reset PARAMS ((void));
static void str_concatc PARAMS ((String *s1, char *cstr));
static void str_copyc PARAMS ((String *s1, char *cstr));
static void str_init PARAMS ((String **s1, unsigned int size));
static void str_trunc PARAMS ((String *s1, unsigned int length));
/* Name under which this program was invoked. */
char *program_name;
/* If nonzero, display counts for all files, not just directories. */
static int opt_all = 0;
/* If nonzero, count each hard link of files with multiple links. */
static int opt_count_all = 0;
/* If nonzero, do not cross file-system boundaries. */
static int opt_one_file_system = 0;
/* If nonzero, print a grand total at the end. */
static int opt_combined_arguments = 0;
/* If nonzero, do not add sizes of subdirectories. */
static int opt_separate_dirs = 0;
/* If nonzero, dereference symlinks that are command line arguments. */
static int opt_dereference_arguments = 0;
/* 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 int max_depth = INT_MAX;
/* If positive, the units to use when printing sizes;
if negative, the human-readable base. */
static int output_block_size;
/* Accumulated path for file or directory being processed. */
static String *path;
/* Pointer to hash structure, used by the hash routines. */
static struct htab *htab;
/* Globally used stat buffer. */
static struct stat stat_buf;
/* A pointer to either lstat or stat, depending on whether
dereferencing of all symbolic links is to be done. */
static int (*xstat) ();
/* The exit status to use if we don't get any fatal errors. */
static int exit_status;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output and exit. */
static int show_version;
/* File name patterns to exclude. */
static struct exclude *exclude;
/* Grand total size of all args, in units of ST_NBLOCKSIZE-byte blocks. */
static uintmax_t tot_size = 0;
static struct option const long_options[] =
{
{"all", no_argument, &opt_all, 1},
{"block-size", required_argument, 0, 129},
{"bytes", no_argument, NULL, 'b'},
{"count-links", no_argument, &opt_count_all, 1},
{"dereference", no_argument, NULL, 'L'},
{"dereference-args", no_argument, &opt_dereference_arguments, 1},
{"exclude", required_argument, 0, 128},
{"exclude-from", required_argument, 0, 'X'},
{"human-readable", no_argument, NULL, 'h'},
{"si", no_argument, 0, 'H'},
{"kilobytes", no_argument, NULL, 'k'},
{"max-depth", required_argument, NULL, 13},
{"megabytes", no_argument, NULL, 'm'},
{"one-file-system", no_argument, &opt_one_file_system, 1},
{"separate-dirs", no_argument, &opt_separate_dirs, 1},
{"summarize", no_argument, NULL, 's'},
{"total", no_argument, &opt_combined_arguments, 1},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
static void
usage (int status, char *reason)
{
if (reason != NULL)
fprintf (status == 0 ? stdout : stderr, "%s: %s\n",
program_name, reason);
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name);
printf (_("\
Summarize disk usage of each FILE, recursively for directories.\n\
\n\
-a, --all write counts for all files, not just directories\n\
--block-size=SIZE use SIZE-byte blocks\n\
-b, --bytes print size in bytes\n\
-c, --total produce a grand total\n\
-D, --dereference-args dereference PATHs when symbolic link\n\
-h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)\n\
-H, --si likewise, but use powers of 1000 not 1024\n\
-k, --kilobytes like --block-size=1024\n\
-l, --count-links count sizes many times if hard linked\n\
-L, --dereference dereference all symbolic links\n\
-m, --megabytes like --block-size=1048576\n\
-S, --separate-dirs do not include size of subdirectories\n\
-s, --summarize display only a total for each argument\n\
-x, --one-file-system skip directories on different filesystems\n\
-X FILE, --exclude-from=FILE Exclude files that match any pattern in FILE.\n\
--exclude=PAT Exclude files that match PAT.\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\
--help display this help and exit\n\
--version output version information and exit\n\
"));
puts (_("\nReport bugs to <fileutils-bugs@gnu.org>."));
close_stdout ();
}
exit (status);
}
int
main (int argc, char **argv)
{
int c;
char *cwd_only[2];
int max_depth_specified = 0;
/* If nonzero, display only a total for each argument. */
int opt_summarize_only = 0;
cwd_only[0] = ".";
cwd_only[1] = NULL;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
exclude = new_exclude ();
xstat = lstat;
human_block_size (getenv ("DU_BLOCK_SIZE"), 0, &output_block_size);
while ((c = getopt_long (argc, argv, "abchHklmsxDLSX:", long_options, NULL))
!= -1)
{
long int tmp_long;
switch (c)
{
case 0: /* Long option. */
break;
case 'a':
opt_all = 1;
break;
case 'b':
output_block_size = 1;
break;
case 'c':
opt_combined_arguments = 1;
break;
case 'h':
output_block_size = -1024;
break;
case 'H':
output_block_size = -1000;
break;
case 'k':
output_block_size = 1024;
break;
case 13: /* --max-depth=N */
if (xstrtol (optarg, NULL, 0, &tmp_long, NULL) != LONGINT_OK
|| tmp_long < 0 || tmp_long > INT_MAX)
error (1, 0, _("invalid maximum depth `%s'"), optarg);
max_depth_specified = 1;
max_depth = (int) tmp_long;
break;
case 'm':
output_block_size = 1024 * 1024;
break;
case 'l':
opt_count_all = 1;
break;
case 's':
opt_summarize_only = 1;
break;
case 'x':
opt_one_file_system = 1;
break;
case 'D':
opt_dereference_arguments = 1;
break;
case 'L':
xstat = stat;
break;
case 'S':
opt_separate_dirs = 1;
break;
case 'X':
if (add_exclude_file (exclude, optarg, '\n') != 0)
error (1, errno, "%s", optarg);
break;
case 128:
add_exclude (exclude, optarg);
break;
case 129:
human_block_size (optarg, 1, &output_block_size);
break;
default:
usage (1, (char *) 0);
}
}
if (show_version)
{
printf ("du (%s) %s\n", GNU_PACKAGE, VERSION);
close_stdout ();
exit (0);
}
if (show_help)
usage (0, NULL);
if (opt_all && opt_summarize_only)
usage (1, _("cannot both summarize and show all entries"));
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)
{
error (0, 0,
_("warning: summarizing conflicts with --max-depth=%d"),
max_depth);
usage (1, NULL);
}
if (opt_summarize_only)
max_depth = 0;
/* Initialize the hash structure for inode numbers. */
hash_init (INITIAL_HASH_MODULE, INITIAL_ENTRY_TAB_SIZE);
str_init (&path, INITIAL_PATH_SIZE);
du_files (optind == argc ? cwd_only : argv + optind);
close_stdout ();
exit (exit_status);
}
/* Print N_BLOCKS followed by STRING on a line. NBLOCKS is the number of
ST_NBLOCKSIZE-byte blocks; convert it to OUTPUT_BLOCK_SIZE units before
printing. If OUTPUT_BLOCK_SIZE is negative, use a human readable
notation instead. */
static void
print_size (uintmax_t n_blocks, const char *string)
{
char buf[LONGEST_HUMAN_READABLE + 1];
printf ("%s\t%s\n",
human_readable (n_blocks, buf, ST_NBLOCKSIZE, output_block_size),
string);
FFLUSH (stdout);
}
/* Recursively print the sizes of the directories (and, if selected, files)
named in FILES, the last entry of which is NULL. */
static void
du_files (char **files)
{
struct saved_cwd cwd;
ino_t initial_ino; /* Initial directory's inode. */
dev_t initial_dev; /* Initial directory's device. */
int i; /* Index in FILES. */
if (save_cwd (&cwd))
exit (1);
/* Remember the inode and device number of the current directory. */
if (stat (".", &stat_buf))
error (1, errno, _("current directory"));
initial_ino = stat_buf.st_ino;
initial_dev = stat_buf.st_dev;
for (i = 0; files[i]; i++)
{
char *arg;
int s;
arg = files[i];
/* Delete final slash in the argument, unless the slash is alone. */
s = strlen (arg) - 1;
if (s != 0)
{
if (arg[s] == '/')
arg[s] = 0;
str_copyc (path, arg);
}
else if (arg[0] == '/')
str_trunc (path, 0); /* Null path for root directory. */
else
str_copyc (path, arg);
if (!opt_combined_arguments)
hash_reset ();
count_entry (arg, 1, 0, 0);
/* chdir if `count_entry' has changed the working directory. */
if (stat (".", &stat_buf))
error (1, errno, ".");
if (stat_buf.st_ino != initial_ino || stat_buf.st_dev != initial_dev)
{
if (restore_cwd (&cwd, _("starting directory"), NULL))
exit (1);
}
}
if (opt_combined_arguments)
print_size (tot_size, _("total"));
free_cwd (&cwd);
}
/* Print (if appropriate) the size (in units determined by `output_block_size')
of file or directory ENT. Return the size of ENT in units of 512-byte
blocks. TOP is one for external calls, zero for recursive calls.
LAST_DEV is the device that the parent directory of ENT is on.
DEPTH is the number of levels (in hierarchy) down from a command
line argument. Don't print if DEPTH > max_depth. */
static uintmax_t
count_entry (const char *ent, int top, dev_t last_dev, int depth)
{
uintmax_t size;
if (((top && opt_dereference_arguments)
? stat (ent, &stat_buf)
: (*xstat) (ent, &stat_buf)) < 0)
{
error (0, errno, "%s", path->text);
exit_status = 1;
return 0;
}
if (!opt_count_all
&& stat_buf.st_nlink > 1
&& hash_insert (stat_buf.st_ino, stat_buf.st_dev))
return 0; /* Have counted this already. */
size = ST_NBLOCKS (stat_buf);
tot_size += size;
if (S_ISDIR (stat_buf.st_mode))
{
unsigned pathlen;
dev_t dir_dev;
char *name_space;
char *namep;
struct saved_cwd cwd;
int through_symlink;
struct stat e_buf;
dir_dev = stat_buf.st_dev;
if (opt_one_file_system && !top && last_dev != dir_dev)
return 0; /* Don't enter a new file system. */
#ifndef S_ISLNK
# define S_ISLNK(s) 0
#endif
/* If we're dereferencing symlinks and we're about to chdir through
a symlink, remember the current directory so we can return to it
later. In other cases, chdir ("..") works fine. */
through_symlink = (xstat == stat
&& lstat (ent, &e_buf) == 0
&& S_ISLNK (e_buf.st_mode));
if (through_symlink && save_cwd (&cwd))
exit (1);
if (chdir (ent) < 0)
{
error (0, errno, _("cannot change to directory %s"), path->text);
exit_status = 1;
return 0;
}
errno = 0;
name_space = savedir (".", (unsigned int) stat_buf.st_size);
if (name_space == NULL)
{
if (errno)
{
error (0, errno, "%s", path->text);
if (through_symlink)
{
if (restore_cwd (&cwd, "..", path->text))
exit (1);
free_cwd (&cwd);
}
else if (chdir ("..") < 0)
error (1, errno, _("cannot change to `..' from directory %s"),
path->text);
exit_status = 1;
return 0;
}
else
error (1, 0, _("virtual memory exhausted"));
}
/* Remember the current path. */
str_concatc (path, "/");
pathlen = path->length;
for (namep = name_space; *namep; namep += strlen (namep) + 1)
{
if (!excluded_filename (exclude, namep))
{
str_concatc (path, namep);
size += count_entry (namep, 0, dir_dev, depth + 1);
str_trunc (path, pathlen);
}
}
free (name_space);
if (through_symlink)
{
restore_cwd (&cwd, "..", path->text);
free_cwd (&cwd);
}
else if (chdir ("..") < 0)
{
error (1, errno,
_("cannot change to `..' from directory %s"), path->text);
}
str_trunc (path, pathlen - 1); /* Remove the "/" we added. */
if (depth <= max_depth || top)
print_size (size, path->length > 0 ? path->text : "/");
return opt_separate_dirs ? 0 : size;
}
else if ((opt_all && depth <= max_depth) || top)
{
/* FIXME: make this an option. */
int print_only_dir_size = 0;
if (!print_only_dir_size)
print_size (size, path->length > 0 ? path->text : "/");
}
return size;
}
/* Allocate space for the hash structures, and set the global
variable `htab' to point to it. The initial hash module is specified in
MODULUS, and the number of entries are specified in ENTRY_TAB_SIZE. (The
hash structure will be rebuilt when ENTRY_TAB_SIZE entries have been
inserted, and MODULUS and ENTRY_TAB_SIZE in the global `htab' will be
doubled.) */
static void
hash_init (unsigned int modulus, unsigned int entry_tab_size)
{
struct htab *htab_r;
htab_r = (struct htab *)
xmalloc (sizeof (struct htab) + sizeof (struct entry *) * modulus);
htab_r->entry_tab = (struct entry *)
xmalloc (sizeof (struct entry) * entry_tab_size);
htab_r->modulus = modulus;
htab_r->entry_tab_size = entry_tab_size;
htab = htab_r;
hash_reset ();
}
/* Reset the hash structure in the global variable `htab' to
contain no entries. */
static void
hash_reset (void)
{
int i;
struct entry **p;
htab->first_free_entry = 0;
p = htab->hash;
for (i = htab->modulus; i > 0; i--)
*p++ = NULL;
}
/* Insert an item (inode INO and device DEV) in the hash
structure in the global variable `htab', if an entry with the same data
was not found already. Return zero if the item was inserted and nonzero
if it wasn't. */
static int
hash_insert (ino_t ino, dev_t dev)
{
struct htab *htab_r = htab; /* Initially a copy of the global `htab'. */
if (htab_r->first_free_entry >= htab_r->entry_tab_size)
{
int i;
struct entry *ep;
unsigned modulus;
unsigned entry_tab_size;
/* Increase the number of hash entries, and re-hash the data.
The method of shrimping and increasing is made to compactify
the heap. If twice as much data would be allocated
straightforwardly, we would never re-use a byte of memory. */
/* Let `htab' shrimp. Keep only the header, not the pointer vector. */
htab_r = (struct htab *)
xrealloc ((char *) htab_r, sizeof (struct htab));
modulus = 2 * htab_r->modulus;
entry_tab_size = 2 * htab_r->entry_tab_size;
/* Increase the number of possible entries. */
htab_r->entry_tab = (struct entry *)
xrealloc ((char *) htab_r->entry_tab,
sizeof (struct entry) * entry_tab_size);
/* Increase the size of htab again. */
htab_r = (struct htab *)
xrealloc ((char *) htab_r,
sizeof (struct htab) + sizeof (struct entry *) * modulus);
htab_r->modulus = modulus;
htab_r->entry_tab_size = entry_tab_size;
htab = htab_r;
i = htab_r->first_free_entry;
/* Make the increased hash table empty. The entries are still
available in htab->entry_tab. */
hash_reset ();
/* Go through the entries and install them in the pointer vector
htab->hash. The items are actually inserted in htab->entry_tab at
the position where they already are. The htab->coll_link need
however be updated. Could be made a little more efficient. */
for (ep = htab_r->entry_tab; i > 0; i--)
{
hash_insert2 (htab_r, ep->ino, ep->dev);
ep++;
}
}
return hash_insert2 (htab_r, ino, dev);
}
/* Insert INO and DEV in the hash structure HTAB, if not
already present. Return zero if inserted and nonzero if it
already existed. */
static int
hash_insert2 (struct htab *ht, ino_t ino, dev_t dev)
{
struct entry **hp, *ep2, *ep;
hp = &ht->hash[ino % ht->modulus];
ep2 = *hp;
/* Collision? */
if (ep2 != NULL)
{
ep = ep2;
/* Search for an entry with the same data. */
do
{
if (ep->ino == ino && ep->dev == dev)
return 1; /* Found an entry with the same data. */
ep = ep->coll_link;
}
while (ep != NULL);
/* Did not find it. */
}
ep = *hp = &ht->entry_tab[ht->first_free_entry++];
ep->ino = ino;
ep->dev = dev;
ep->coll_link = ep2; /* `ep2' is NULL if no collision. */
return 0;
}
/* Initialize string S1 to hold SIZE characters. */
static void
str_init (String **s1, unsigned int size)
{
String *s;
s = (String *) xmalloc (sizeof (struct String));
s->text = xmalloc (size + 1);
s->alloc = size;
*s1 = s;
}
static void
ensure_space (String *s, unsigned int size)
{
if (s->alloc < size)
{
s->text = xrealloc (s->text, size + 1);
s->alloc = size;
}
}
/* Assign the null-terminated C-string CSTR to S1. */
static void
str_copyc (String *s1, char *cstr)
{
unsigned l = strlen (cstr);
ensure_space (s1, l);
strcpy (s1->text, cstr);
s1->length = l;
}
static void
str_concatc (String *s1, char *cstr)
{
unsigned l1 = s1->length;
unsigned l2 = strlen (cstr);
unsigned l = l1 + l2;
ensure_space (s1, l);
strcpy (s1->text + l1, cstr);
s1->length = l;
}
/* Truncate the string S1 to have length LENGTH. */
static void
str_trunc (String *s1, unsigned int length)
{
if (s1->length > length)
{
s1->text[length] = 0;
s1->length = length;
}
}
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