NetBSD/usr.bin/du/du.c

280 lines
6.8 KiB
C

/* $NetBSD: du.c,v 1.23 2003/08/07 11:13:34 agc 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\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)du.c 8.5 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: du.c,v 1.23 2003/08/07 11:13:34 agc 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 <util.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int linkchk __P((FTSENT *));
int main __P((int, char **));
void prstat __P((const char *, int64_t));
void usage __P((void));
int hflag;
long blocksize;
int
main(argc, argv)
int argc;
char *argv[];
{
FTS *fts;
FTSENT *p;
int64_t totalblocks;
int ftsoptions, listdirs, listfiles;
int Hflag, Lflag, Pflag, aflag, ch, cflag, gkmflag, rval, sflag;
char *noargv[2];
Hflag = Lflag = Pflag = aflag = cflag = gkmflag = sflag = 0;
totalblocks = 0;
ftsoptions = FTS_PHYSICAL;
while ((ch = getopt(argc, argv, "HLPacghkmrsx")) != -1)
switch (ch) {
case 'H':
Hflag = 1;
Lflag = Pflag = 0;
break;
case 'L':
Lflag = 1;
Hflag = Pflag = 0;
break;
case 'P':
Pflag = 1;
Hflag = Lflag = 0;
break;
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'g':
blocksize = 1024 * 1024 * 1024;
gkmflag = 1;
break;
case 'h':
hflag = 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;
}
if (aflag) {
if (sflag)
usage();
listdirs = listfiles = 1;
} else if (sflag)
listdirs = listfiles = 0;
else {
listfiles = 0;
listdirs = 1;
}
if (!*argv) {
noargv[0] = ".";
noargv[1] = NULL;
argv = noargv;
}
if (!gkmflag)
(void)getbsize(NULL, &blocksize);
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 (listdirs || (!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))
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)
{
if (hflag) {
char buf[5];
int64_t sz = blocks * 512;
humanize_number(buf, sizeof(buf), sz, "", HN_AUTOSCALE,
HN_B | HN_NOSPACE | HN_DECIMAL);
(void)printf("%s\t%s\n", buf, fname);
} else
(void)printf("%lld\t%s\n",
(long long)howmany(blocks, (int64_t)blocksize),
fname);
}
typedef struct _ID {
dev_t dev;
ino_t inode;
} ID;
int
linkchk(p)
FTSENT *p;
{
static ID *files;
static int maxfiles, nfiles;
ID *fp, *start;
ino_t ino;
dev_t dev;
ino = p->fts_statp->st_ino;
dev = p->fts_statp->st_dev;
if ((start = files) != NULL)
for (fp = start + nfiles - 1; fp >= start; --fp)
if (ino == fp->inode && dev == fp->dev)
return (1);
if (nfiles == maxfiles && (files = realloc((char *)files,
(u_int)(sizeof(ID) * (maxfiles += 128)))) == NULL)
err(1, "realloc");
files[nfiles].inode = ino;
files[nfiles].dev = dev;
++nfiles;
return (0);
}
void
usage()
{
(void)fprintf(stderr,
"usage: du [-H | -L | -P] [-a | -s] [-cghkmrx] [file ...]\n");
exit(1);
}