322 lines
7.9 KiB
C
322 lines
7.9 KiB
C
/* $NetBSD: du.c,v 1.33 2008/07/30 22:03:40 dsl Exp $ */
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/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Newcomb.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: du.c,v 1.33 2008/07/30 22:03:40 dsl Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <fts.h>
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#include <util.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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int linkchk(dev_t, ino_t);
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void prstat(const char *, int64_t);
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static void usage(void);
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long blocksize;
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#define howmany(x, y) (((x)+((y)-1))/(y))
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int
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du_main(int argc, char *argv[])
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{
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FTS *fts;
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FTSENT *p;
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int64_t totalblocks;
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int ftsoptions, listfiles;
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int depth;
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int Hflag, Lflag, aflag, ch, cflag, dflag, gkmflag, nflag, rval, sflag;
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const char *noargv[2];
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Hflag = Lflag = aflag = cflag = dflag = gkmflag = sflag = 0;
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totalblocks = 0;
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ftsoptions = FTS_PHYSICAL;
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depth = INT_MAX;
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while ((ch = getopt(argc, argv, "HLPacd:ghkmnrsx")) != -1)
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switch (ch) {
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case 'H':
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Hflag = 1;
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Lflag = 0;
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break;
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case 'L':
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Lflag = 1;
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Hflag = 0;
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break;
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case 'P':
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Hflag = Lflag = 0;
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break;
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case 'a':
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aflag = 1;
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break;
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case 'c':
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cflag = 1;
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break;
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case 'd':
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dflag = 1;
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depth = atoi(optarg);
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if (depth < 0 || depth > SHRT_MAX) {
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warnx("invalid argument to option d: %s",
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optarg);
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usage();
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}
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break;
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case 'g':
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blocksize = 1024 * 1024 * 1024;
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gkmflag = 1;
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break;
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case 'k':
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blocksize = 1024;
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gkmflag = 1;
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break;
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case 'm':
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blocksize = 1024 * 1024;
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gkmflag = 1;
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break;
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case 'r':
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break;
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case 's':
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sflag = 1;
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break;
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case 'x':
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ftsoptions |= FTS_XDEV;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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/*
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* XXX
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* Because of the way that fts(3) works, logical walks will not count
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* the blocks actually used by symbolic links. We rationalize this by
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* noting that users computing logical sizes are likely to do logical
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* copies, so not counting the links is correct. The real reason is
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* that we'd have to re-implement the kernel's symbolic link traversing
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* algorithm to get this right. If, for example, you have relative
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* symbolic links referencing other relative symbolic links, it gets
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* very nasty, very fast. The bottom line is that it's documented in
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* the man page, so it's a feature.
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*/
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if (Hflag)
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ftsoptions |= FTS_COMFOLLOW;
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if (Lflag) {
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ftsoptions &= ~FTS_PHYSICAL;
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ftsoptions |= FTS_LOGICAL;
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}
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listfiles = 0;
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if (aflag) {
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if (sflag || dflag)
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usage();
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listfiles = 1;
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} else if (sflag) {
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if (dflag)
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usage();
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depth = 0;
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}
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if (!*argv) {
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noargv[0] = ".";
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noargv[1] = NULL;
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argv = __UNCONST(noargv);
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}
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if (!gkmflag)
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blocksize = 512;
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blocksize /= 512;
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if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
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err(1, "fts_open `%s'", *argv);
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for (rval = 0; (p = fts_read(fts)) != NULL;) {
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switch (p->fts_info) {
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case FTS_D: /* Ignore. */
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break;
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case FTS_DP:
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p->fts_parent->fts_number +=
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p->fts_number += p->fts_statp->st_blocks;
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if (cflag)
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totalblocks += p->fts_statp->st_blocks;
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/*
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* If listing each directory, or not listing files
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* or directories and this is post-order of the
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* root of a traversal, display the total.
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*/
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if (p->fts_level <= depth
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|| (!listfiles && !p->fts_level))
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prstat(p->fts_path, p->fts_number);
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break;
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case FTS_DC: /* Ignore. */
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break;
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case FTS_DNR: /* Warn, continue. */
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case FTS_ERR:
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case FTS_NS:
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warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
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rval = 1;
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break;
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default:
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if (p->fts_statp->st_nlink > 1 &&
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linkchk(p->fts_statp->st_dev, p->fts_statp->st_ino))
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break;
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/*
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* If listing each file, or a non-directory file was
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* the root of a traversal, display the total.
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*/
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if (listfiles || !p->fts_level)
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prstat(p->fts_path, p->fts_statp->st_blocks);
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p->fts_parent->fts_number += p->fts_statp->st_blocks;
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if (cflag)
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totalblocks += p->fts_statp->st_blocks;
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}
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}
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if (errno)
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err(1, "fts_read");
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if (cflag)
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prstat("total", totalblocks);
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exit(rval);
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}
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void
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prstat(const char *fname, int64_t blocks)
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{
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(void)printf("%lld\t%s\n",
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(long long)howmany(blocks, (int64_t)blocksize),
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fname);
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}
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int
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linkchk(dev_t dev, ino_t ino)
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{
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static struct entry {
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dev_t dev;
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ino_t ino;
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} *htable;
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static int htshift; /* log(allocated size) */
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static int htmask; /* allocated size - 1 */
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static int htused; /* 2*number of insertions */
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static int sawzero; /* Whether zero is in table or not */
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int h, h2;
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uint64_t tmp;
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/* this constant is (1<<64)/((1+sqrt(5))/2)
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* aka (word size)/(golden ratio)
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*/
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const uint64_t HTCONST = 11400714819323198485ULL;
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const int HTBITS = CHAR_BIT * sizeof(tmp);
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/* Never store zero in hashtable */
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if (dev == 0 && ino == 0) {
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h = sawzero;
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sawzero = 1;
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return h;
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}
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/* Extend hash table if necessary, keep load under 0.5 */
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if (htused<<1 >= htmask) {
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struct entry *ohtable;
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if (!htable)
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htshift = 10; /* starting hashtable size */
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else
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htshift++; /* exponential hashtable growth */
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htmask = (1 << htshift) - 1;
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htused = 0;
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ohtable = htable;
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htable = calloc(htmask+1, sizeof(*htable));
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if (!htable)
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err(1, "calloc");
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/* populate newly allocated hashtable */
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if (ohtable) {
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int i;
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for (i = 0; i <= htmask>>1; i++)
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if (ohtable[i].ino || ohtable[i].dev)
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linkchk(ohtable[i].dev, ohtable[i].ino);
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free(ohtable);
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}
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}
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/* multiplicative hashing */
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tmp = dev;
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tmp <<= HTBITS>>1;
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tmp |= ino;
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tmp *= HTCONST;
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h = tmp >> (HTBITS - htshift);
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h2 = 1 | ( tmp >> (HTBITS - (htshift<<1) - 1)); /* must be odd */
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/* open address hashtable search with double hash probing */
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while (htable[h].ino || htable[h].dev) {
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if ((htable[h].ino == ino) && (htable[h].dev == dev))
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return 1;
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h = (h + h2) & htmask;
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}
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/* Insert the current entry into hashtable */
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htable[h].dev = dev;
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htable[h].ino = ino;
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htused++;
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return 0;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: du [-H | -L | -P] [-a | -d depth | -s] [-cgkmrx] [file ...]\n");
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exit(1);
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}
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