+/*
+ * 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 5.12 (Berkeley) 6/20/91";
+#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>
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ extern int optind;
+ register FTS *fts;
+ register FTSENT *p;
+ register int kvalue, listdirs, listfiles;
+ int aflag, ch, ftsoptions, sflag;
+ char **save;
+
+ ftsoptions = FTS_PHYSICAL;
+ kvalue = 0;
+ save = argv;
+ aflag = sflag = 0;
+ while ((ch = getopt(argc, argv, "aksx")) != EOF)
+ switch(ch) {
+ case 'a':
+ aflag = 1;
+ break;
+ case 'k':
+ kvalue = 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;
+ }
+
+ if (!(fts = fts_open(argv, ftsoptions, (int (*)())NULL))) {
+ (void)fprintf(stderr, "du: %s.\n", strerror(errno));
+ exit(1);
+ }
+
+ 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_statb.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", kvalue ?
+ howmany(p->fts_number, 2) :
+ p->fts_number, 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_statb.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", kvalue ?
+ howmany(p->fts_statb.st_blocks, 2) :
+ p->fts_statb.st_blocks, p->fts_path);
+ p->fts_parent->fts_number += p->fts_statb.st_blocks;
+ }
+ exit(0);
+}
+
+typedef struct _ID {
+ dev_t dev;
+ ino_t inode;
+} ID;
+
+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_statb.st_ino;
+ dev = p->fts_statb.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 = (ID *)realloc((char *)files,
+ (u_int)(sizeof(ID) * (maxfiles += 128))))) {
+ (void)fprintf(stderr, "du: %s\n", strerror(errno));
+ exit(1);
+ }
+ files[nfiles].inode = ino;
+ files[nfiles].dev = dev;
+ ++nfiles;
+ return(0);
+}
+
+usage()
+{
+ (void)fprintf(stderr, "usage: du [-a | -s] [-kx] [file ...]\n");
+ exit(1);
+}
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