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don't need to worry about pre/post order and skipping directories.
remove more dead code

/*	$OpenBSD: rm.c,v 1.11 2016/10/10 18:13:21 tedu Exp $	*/
/*	$NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $	*/

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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/types.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static int eval;

static void	checkdot(char **);
static void	rm_tree(char **);

int
rmmain(int argc, char *argv[])
{

	checkdot(argv);

	if (*argv)
		rm_tree(argv);

	return (eval);
}

static void
rm_tree(char **argv)
{
	FTS *fts;
	FTSENT *p;
	int flags;

	flags = FTS_PHYSICAL;
	flags |= FTS_NOSTAT;
	if (!(fts = fts_open(argv, flags, NULL)))
		err(1, NULL);
	while ((p = fts_read(fts)) != NULL) {
		switch (p->fts_info) {
		case FTS_DNR:
			if (p->fts_errno != ENOENT) {
				warnx("%s: %s",
				    p->fts_path, strerror(p->fts_errno));
				eval = 1;
			}
			continue;
		case FTS_ERR:
			errc(1, p->fts_errno, "%s", p->fts_path);
		case FTS_D:
			continue;
		default:
			break;
		}

		/*
		 * If we can't read or search the directory, may still be
		 * able to remove it.  Don't print out the un{read,search}able
		 * message unless the remove fails.
		 */
		switch (p->fts_info) {
		case FTS_DP:
		case FTS_DNR:
			if (!rmdir(p->fts_accpath) ||
			    (errno == ENOENT))
				continue;
			break;

		case FTS_F:
		case FTS_NSOK:
		default:
			if (!unlink(p->fts_accpath) ||
			    (errno == ENOENT))
				continue;
		}
		warn("%s", p->fts_path);
		eval = 1;
	}
	if (errno)
		err(1, "fts_read");
	fts_close(fts);
}

/*
 * POSIX.2 requires that if "." or ".." are specified as the basename
 * portion of an operand, a diagnostic message be written to standard
 * error and nothing more be done with such operands.
 *
 * Since POSIX.2 defines basename as the final portion of a path after
 * trailing slashes have been removed, we'll remove them here.
 */
#define ISDOT(a)	((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
static void
checkdot(char **argv)
{
	char *p, **save, **t;
	int complained;

	complained = 0;
	for (t = argv; *t;) {
		/* strip trailing slashes */
		p = strrchr (*t, '\0');
		while (--p > *t && *p == '/')
			*p = '\0';

		/* extract basename */
		if ((p = strrchr(*t, '/')) != NULL)
			++p;
		else
			p = *t;

		if (ISDOT(p)) {
			if (!complained++)
				warnx("\".\" and \"..\" may not be removed");
			eval = 1;
			for (save = t; (t[0] = t[1]) != NULL; ++t)
				continue;
			t = save;
		} else
			++t;
	}
}