FreeBSD-5.3/usr.bin/du/du.c
/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Newcomb.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static const char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/du/du.c,v 1.36 2004/07/28 16:03:12 stefanf Exp $");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fnmatch.h>
#include <fts.h>
#include <libutil.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
SLIST_HEAD(ignhead, ignentry) ignores;
struct ignentry {
char *mask;
SLIST_ENTRY(ignentry) next;
};
static int linkchk(FTSENT *);
static void usage(void);
void prthumanval(int64_t);
void ignoreadd(const char *);
void ignoreclean(void);
int ignorep(FTSENT *);
int
main(int argc, char *argv[])
{
FTS *fts;
FTSENT *p;
long blocksize, savednumber = 0;
int ftsoptions;
int listall;
int depth;
int Hflag, Lflag, Pflag, aflag, sflag, dflag, cflag, hflag, ch, notused, rval;
char **save;
static char dot[] = ".";
setlocale(LC_ALL, "");
Hflag = Lflag = Pflag = aflag = sflag = dflag = cflag = hflag = 0;
save = argv;
ftsoptions = 0;
depth = INT_MAX;
SLIST_INIT(&ignores);
while ((ch = getopt(argc, argv, "HI:LPasd:chkmrx")) != -1)
switch (ch) {
case 'H':
Hflag = 1;
break;
case 'I':
ignoreadd(optarg);
break;
case 'L':
if (Pflag)
usage();
Lflag = 1;
break;
case 'P':
if (Lflag)
usage();
Pflag = 1;
break;
case 'a':
aflag = 1;
break;
case 's':
sflag = 1;
break;
case 'd':
dflag = 1;
errno = 0;
depth = atoi(optarg);
if (errno == ERANGE || depth < 0) {
warnx("invalid argument to option d: %s", optarg);
usage();
}
break;
case 'c':
cflag = 1;
break;
case 'h':
putenv("BLOCKSIZE=512");
hflag = 1;
break;
case 'k':
hflag = 0;
putenv("BLOCKSIZE=1024");
break;
case 'm':
hflag = 0;
putenv("BLOCKSIZE=1048576");
break;
case 'r': /* Compatibility. */
break;
case 'x':
ftsoptions |= FTS_XDEV;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
/*
* XXX
* Because of the way that fts(3) works, logical walks will not count
* the blocks actually used by symbolic links. We rationalize this by
* noting that users computing logical sizes are likely to do logical
* copies, so not counting the links is correct. The real reason is
* that we'd have to re-implement the kernel's symbolic link traversing
* algorithm to get this right. If, for example, you have relative
* symbolic links referencing other relative symbolic links, it gets
* very nasty, very fast. The bottom line is that it's documented in
* the man page, so it's a feature.
*/
if (Hflag + Lflag + Pflag > 1)
usage();
if (Hflag + Lflag + Pflag == 0)
Pflag = 1; /* -P (physical) is default */
if (Hflag)
ftsoptions |= FTS_COMFOLLOW;
if (Lflag)
ftsoptions |= FTS_LOGICAL;
if (Pflag)
ftsoptions |= FTS_PHYSICAL;
listall = 0;
if (aflag) {
if (sflag || dflag)
usage();
listall = 1;
} else if (sflag) {
if (dflag)
usage();
depth = 0;
}
if (!*argv) {
argv = save;
argv[0] = dot;
argv[1] = NULL;
}
(void) getbsize(¬used, &blocksize);
blocksize /= 512;
rval = 0;
if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
err(1, "fts_open");
while ((p = fts_read(fts)) != NULL) {
switch (p->fts_info) {
case FTS_D: /* Ignore. */
if (ignorep(p))
fts_set(fts, p, FTS_SKIP);
break;
case FTS_DP:
if (ignorep(p))
break;
p->fts_parent->fts_number +=
p->fts_number += p->fts_statp->st_blocks;
if (p->fts_level <= depth) {
if (hflag) {
(void) prthumanval(howmany(p->fts_number, blocksize));
(void) printf("\t%s\n", p->fts_path);
} else {
(void) printf("%ld\t%s\n",
howmany(p->fts_number, blocksize),
p->fts_path);
}
}
break;
case FTS_DC: /* Ignore. */
break;
case FTS_DNR: /* Warn, continue. */
case FTS_ERR:
case FTS_NS:
warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
rval = 1;
break;
default:
if (ignorep(p))
break;
if (p->fts_statp->st_nlink > 1 && linkchk(p))
break;
if (listall || p->fts_level == 0) {
if (hflag) {
(void) prthumanval(howmany(p->fts_statp->st_blocks,
blocksize));
(void) printf("\t%s\n", p->fts_path);
} else {
(void) printf("%lld\t%s\n",
(long long)howmany(p->fts_statp->st_blocks, blocksize),
p->fts_path);
}
}
p->fts_parent->fts_number += p->fts_statp->st_blocks;
}
savednumber = p->fts_parent->fts_number;
}
if (errno)
err(1, "fts_read");
if (cflag) {
if (hflag) {
(void) prthumanval(howmany(savednumber, blocksize));
(void) printf("\ttotal\n");
} else {
(void) printf("%ld\ttotal\n", howmany(savednumber, blocksize));
}
}
ignoreclean();
exit(rval);
}
static int
linkchk(FTSENT *p)
{
struct links_entry {
struct links_entry *next;
struct links_entry *previous;
int links;
dev_t dev;
ino_t ino;
};
static const size_t links_hash_initial_size = 8192;
static struct links_entry **buckets;
static struct links_entry *free_list;
static size_t number_buckets;
static unsigned long number_entries;
static char stop_allocating;
struct links_entry *le, **new_buckets;
struct stat *st;
size_t i, new_size;
int count, hash;
st = p->fts_statp;
/* If necessary, initialize the hash table. */
if (buckets == NULL) {
number_buckets = links_hash_initial_size;
buckets = malloc(number_buckets * sizeof(buckets[0]));
if (buckets == NULL)
errx(1, "No memory for hardlink detection");
for (i = 0; i < number_buckets; i++)
buckets[i] = NULL;
}
/* If the hash table is getting too full, enlarge it. */
if (number_entries > number_buckets * 10 && !stop_allocating) {
new_size = number_buckets * 2;
new_buckets = malloc(new_size * sizeof(struct links_entry *));
count = 0;
/* Try releasing the free list to see if that helps. */
if (new_buckets == NULL && free_list != NULL) {
while (free_list != NULL) {
le = free_list;
free_list = le->next;
free(le);
}
new_buckets = malloc(new_size * sizeof(new_buckets[0]));
}
if (new_buckets == NULL) {
stop_allocating = 1;
warnx("No more memory for tracking hard links");
} else {
memset(new_buckets, 0,
new_size * sizeof(struct links_entry *));
for (i = 0; i < number_buckets; i++) {
while (buckets[i] != NULL) {
/* Remove entry from old bucket. */
le = buckets[i];
buckets[i] = le->next;
/* Add entry to new bucket. */
hash = (le->dev ^ le->ino) % new_size;
if (new_buckets[hash] != NULL)
new_buckets[hash]->previous =
le;
le->next = new_buckets[hash];
le->previous = NULL;
new_buckets[hash] = le;
}
}
free(buckets);
buckets = new_buckets;
number_buckets = new_size;
}
}
/* Try to locate this entry in the hash table. */
hash = ( st->st_dev ^ st->st_ino ) % number_buckets;
for (le = buckets[hash]; le != NULL; le = le->next) {
if (le->dev == st->st_dev && le->ino == st->st_ino) {
/*
* Save memory by releasing an entry when we've seen
* all of it's links.
*/
if (--le->links <= 0) {
if (le->previous != NULL)
le->previous->next = le->next;
if (le->next != NULL)
le->next->previous = le->previous;
if (buckets[hash] == le)
buckets[hash] = le->next;
number_entries--;
/* Recycle this node through the free list */
if (stop_allocating) {
free(le);
} else {
le->next = free_list;
free_list = le;
}
}
return (1);
}
}
if (stop_allocating)
return (0);
/* Add this entry to the links cache. */
if (free_list != NULL) {
/* Pull a node from the free list if we can. */
le = free_list;
free_list = le->next;
} else
/* Malloc one if we have to. */
le = malloc(sizeof(struct links_entry));
if (le == NULL) {
stop_allocating = 1;
warnx("No more memory for tracking hard links");
return (0);
}
le->dev = st->st_dev;
le->ino = st->st_ino;
le->links = st->st_nlink - 1;
number_entries++;
le->next = buckets[hash];
le->previous = NULL;
if (buckets[hash] != NULL)
buckets[hash]->previous = le;
buckets[hash] = le;
return (0);
}
void
prthumanval(int64_t bytes)
{
char buf[5];
bytes *= DEV_BSIZE;
humanize_number(buf, sizeof(buf), bytes, "", HN_AUTOSCALE,
HN_B | HN_NOSPACE | HN_DECIMAL);
(void)printf("%4s", buf);
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: du [-H | -L | -P] [-a | -s | -d depth] [-c] [-h | -k | -m] [-x] [-I mask] [file ...]\n");
exit(EX_USAGE);
}
void
ignoreadd(const char *mask)
{
struct ignentry *ign;
ign = calloc(1, sizeof(*ign));
if (ign == NULL)
errx(1, "cannot allocate memory");
ign->mask = strdup(mask);
if (ign->mask == NULL)
errx(1, "cannot allocate memory");
SLIST_INSERT_HEAD(&ignores, ign, next);
}
void
ignoreclean(void)
{
struct ignentry *ign;
while (!SLIST_EMPTY(&ignores)) {
ign = SLIST_FIRST(&ignores);
SLIST_REMOVE_HEAD(&ignores, next);
free(ign->mask);
free(ign);
}
}
int
ignorep(FTSENT *ent)
{
struct ignentry *ign;
SLIST_FOREACH(ign, &ignores, next)
if (fnmatch(ign->mask, ent->fts_name, 0) != FNM_NOMATCH)
return 1;
return 0;
}