usr.bin/du/du.c

/*
 * Copyright (c) 1989 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
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)du.c        5.17 (Berkeley) 5/20/92";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <dirent.h>
#include <stdio.h>
#include <fts.h>
#include <string.h>
#include <stdlib.h>

void     err __P((const char *, ...));
char    *getbsize __P((char *, int *, long *));
int      linkchk __P((FTSENT *));
void     usage __P((void));

int     kflag;

main(argc, argv)
        int argc;
        char *argv[];
{
        register FTS *fts;
        register FTSENT *p;
        register int listdirs, listfiles;
        long blocksize;
        int aflag, ch, ftsoptions, notused, sflag;
        char **save;

        ftsoptions = FTS_PHYSICAL;
        save = argv;
        aflag = kflag = sflag = 0;
        while ((ch = getopt(argc, argv, "aksx")) != EOF)
                switch(ch) {
                case 'a':
                        aflag = 1;
                        break;
                case 'k':
                        kflag = 1;
                        break;
                case 's':
                        sflag = 1;
                        break;
                case 'x':
                        ftsoptions |= FTS_XDEV;
                        break;
                case '?':
                default:
                        usage();
                }
        argv += optind;

        if (aflag) {
                if (sflag)
                        usage();
                listdirs = listfiles = 1;
        } else if (sflag)
                listdirs = listfiles = 0;
        else {
                listfiles = 0;
                listdirs = 1;
        }

        if (!*argv) {
                argv = save;
                argv[0] = ".";
                argv[1] = NULL;
        }

        (void)getbsize("du", &notused, &blocksize);
        blocksize /= 512;

        if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
                err("%s", strerror(errno));

        while (p = fts_read(fts))
                switch(p->fts_info) {
                case FTS_D:
                        break;
                case FTS_DP:
                        p->fts_parent->fts_number +=
                            p->fts_number += 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)
                                (void)printf("%ld\t%s\n",
                                    howmany(p->fts_number, blocksize),
                                    p->fts_path);
                        break;
                case FTS_DNR:
                case FTS_ERR:
                case FTS_NS:
                        (void)fprintf(stderr,
                            "du: %s: %s\n", p->fts_path, strerror(errno));
                        break;
                case FTS_SL:
                        if (p->fts_level == FTS_ROOTLEVEL) {
                                (void)fts_set(fts, p, FTS_FOLLOW);
                                break;
                        }
                        /* FALLTHROUGH */
                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)
                                (void)printf("%ld\t%s\n",
                                    howmany(p->fts_statp->st_blocks, blocksize),
                                    p->fts_path);
                        p->fts_parent->fts_number += p->fts_statp->st_blocks;
                }
        if (errno)
                err("%s", strerror(errno));
        exit(0);
}

typedef struct _ID {
        dev_t   dev;
        ino_t   inode;
} ID;

int
linkchk(p)
        register FTSENT *p;
{
        static ID *files;
        static int maxfiles, nfiles;
        register ID *fp, *start;
        register ino_t ino;
        register dev_t dev;

        ino = p->fts_statp->st_ino;
        dev = p->fts_statp->st_dev;
        if (start = files)
                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("%s", strerror(errno));
        files[nfiles].inode = ino;
        files[nfiles].dev = dev;
        ++nfiles;
        return(0);
}

void
usage()
{
        (void)fprintf(stderr, "usage: du [-a | -s] [-x] [file ...]\n");
        exit(1);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
        char *fmt;
        va_dcl
#endif
{
        va_list ap;
#if __STDC__
        va_start(ap, fmt);
#else
        va_start(ap);
#endif
        (void)fprintf(stderr, "du: ");
        (void)vfprintf(stderr, fmt, ap);
        va_end(ap);
        (void)fprintf(stderr, "\n");
        exit(1);
        /* NOTREACHED */
}