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- /* $NetBSD: du.c,v 1.33 2008/07/30 22:03:40 dsl Exp $ */
- /*
- * 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. 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.
- */
- #include <sys/cdefs.h>
- #ifndef lint
- __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\
- The Regents of the University of California. All rights reserved.");
- #endif /* not lint */
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95";
- #else
- __RCSID("$NetBSD: du.c,v 1.33 2008/07/30 22:03:40 dsl Exp $");
- #endif
- #endif /* not lint */
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <dirent.h>
- #include <err.h>
- #include <errno.h>
- #include <fts.h>
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <limits.h>
- int linkchk(dev_t, ino_t);
- void prstat(const char *, int64_t);
- static void usage(void);
- long blocksize;
- #define howmany(x, y) (((x)+((y)-1))/(y))
- int
- main(int argc, char *argv[])
- {
- FTS *fts;
- FTSENT *p;
- int64_t totalblocks;
- int ftsoptions, listfiles;
- int depth;
- int Hflag, Lflag, aflag, ch, cflag, dflag, gkmflag, rval, sflag;
- char *noargv[2];
- Hflag = Lflag = aflag = cflag = dflag = gkmflag = sflag = 0;
- totalblocks = 0;
- ftsoptions = FTS_PHYSICAL;
- depth = INT_MAX;
- while ((ch = getopt(argc, argv, "HLPacd:ghkmnrsx")) != -1)
- switch (ch) {
- case 'H':
- Hflag = 1;
- Lflag = 0;
- break;
- case 'L':
- Lflag = 1;
- Hflag = 0;
- break;
- case 'P':
- Hflag = Lflag = 0;
- break;
- case 'a':
- aflag = 1;
- break;
- case 'c':
- cflag = 1;
- break;
- case 'd':
- dflag = 1;
- depth = atoi(optarg);
- if (depth < 0 || depth > SHRT_MAX) {
- warnx("invalid argument to option d: %s",
- optarg);
- usage();
- }
- break;
- case 'g':
- blocksize = 1024 * 1024 * 1024;
- gkmflag = 1;
- break;
- case 'k':
- blocksize = 1024;
- gkmflag = 1;
- break;
- case 'm':
- blocksize = 1024 * 1024;
- gkmflag = 1;
- break;
- case 'r':
- break;
- case 's':
- sflag = 1;
- 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)
- ftsoptions |= FTS_COMFOLLOW;
- if (Lflag) {
- ftsoptions &= ~FTS_PHYSICAL;
- ftsoptions |= FTS_LOGICAL;
- }
- listfiles = 0;
- if (aflag) {
- if (sflag || dflag)
- usage();
- listfiles = 1;
- } else if (sflag) {
- if (dflag)
- usage();
- depth = 0;
- }
- if (!*argv) {
- noargv[0] = strdup(".");
- noargv[1] = NULL;
- argv = noargv;
- }
- if (!gkmflag)
- blocksize = 512;
- blocksize /= 512;
- if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
- err(1, "fts_open `%s'", *argv);
- for (rval = 0; (p = fts_read(fts)) != NULL;) {
- switch (p->fts_info) {
- case FTS_D: /* Ignore. */
- break;
- case FTS_DP:
- p->fts_parent->fts_number +=
- p->fts_number += p->fts_statp->st_blocks;
- if (cflag)
- totalblocks += p->fts_statp->st_blocks;
- /*
- * If listing each directory, or not listing files
- * or directories and this is post-order of the
- * root of a traversal, display the total.
- */
- if (p->fts_level <= depth
- || (!listfiles && !p->fts_level))
- prstat(p->fts_path, p->fts_number);
- 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 (p->fts_statp->st_nlink > 1 &&
- linkchk(p->fts_statp->st_dev, p->fts_statp->st_ino))
- break;
- /*
- * If listing each file, or a non-directory file was
- * the root of a traversal, display the total.
- */
- if (listfiles || !p->fts_level)
- prstat(p->fts_path, p->fts_statp->st_blocks);
- p->fts_parent->fts_number += p->fts_statp->st_blocks;
- if (cflag)
- totalblocks += p->fts_statp->st_blocks;
- }
- }
- if (errno)
- err(1, "fts_read");
- if (cflag)
- prstat("total", totalblocks);
- exit(rval);
- }
- void
- prstat(const char *fname, int64_t blocks)
- {
- (void)printf("%lld\t%s\n",
- (long long)howmany(blocks, (int64_t)blocksize),
- fname);
- }
- int
- linkchk(dev_t dev, ino_t ino)
- {
- static struct entry {
- dev_t dev;
- ino_t ino;
- } *htable;
- static int htshift; /* log(allocated size) */
- static int htmask; /* allocated size - 1 */
- static int htused; /* 2*number of insertions */
- static int sawzero; /* Whether zero is in table or not */
- int h, h2;
- uint64_t tmp;
- /* this constant is (1<<64)/((1+sqrt(5))/2)
- * aka (word size)/(golden ratio)
- */
- const uint64_t HTCONST = 11400714819323198485ULL;
- const int HTBITS = CHAR_BIT * sizeof(tmp);
- /* Never store zero in hashtable */
- if (dev == 0 && ino == 0) {
- h = sawzero;
- sawzero = 1;
- return h;
- }
- /* Extend hash table if necessary, keep load under 0.5 */
- if (htused<<1 >= htmask) {
- struct entry *ohtable;
- if (!htable)
- htshift = 10; /* starting hashtable size */
- else
- htshift++; /* exponential hashtable growth */
- htmask = (1 << htshift) - 1;
- htused = 0;
- ohtable = htable;
- htable = calloc(htmask+1, sizeof(*htable));
- if (!htable)
- err(1, "calloc");
- /* populate newly allocated hashtable */
- if (ohtable) {
- int i;
- for (i = 0; i <= htmask>>1; i++)
- if (ohtable[i].ino || ohtable[i].dev)
- linkchk(ohtable[i].dev, ohtable[i].ino);
- free(ohtable);
- }
- }
- /* multiplicative hashing */
- tmp = dev;
- tmp <<= HTBITS>>1;
- tmp |= ino;
- tmp *= HTCONST;
- h = tmp >> (HTBITS - htshift);
- h2 = 1 | ( tmp >> (HTBITS - (htshift<<1) - 1)); /* must be odd */
- /* open address hashtable search with double hash probing */
- while (htable[h].ino || htable[h].dev) {
- if ((htable[h].ino == ino) && (htable[h].dev == dev))
- return 1;
- h = (h + h2) & htmask;
- }
- /* Insert the current entry into hashtable */
- htable[h].dev = dev;
- htable[h].ino = ino;
- htused++;
- return 0;
- }
- static void
- usage(void)
- {
- (void)fprintf(stderr,
- "usage: du [-H | -L | -P] [-a | -d depth | -s] [-cgkmrx] [file ...]\n");
- exit(1);
- }
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