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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: rcsclean.c,v 1.54 2015/01/16 06:40:11 deraadt Exp $	*/
/*
 * Copyright (c) 2005 Joris Vink <joris@openbsd.org>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 <dirent.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "rcsprog.h"
#include "diff.h"

static void	rcsclean_file(char *, const char *);

static int nflag = 0;
static int kflag = RCS_KWEXP_ERR;
static int uflag = 0;
static int flags = 0;
static char *locker = NULL;

int
rcsclean_main(int argc, char **argv)
{
	int i, ch;
	char *rev_str;
	DIR *dirp;
	struct dirent *dp;

	rev_str = NULL;

	while ((ch = rcs_getopt(argc, argv, "k:n::q::r::Tu::Vx::")) != -1) {
		switch (ch) {
		case 'k':
			kflag = rcs_kflag_get(rcs_optarg);
			if (RCS_KWEXP_INVAL(kflag)) {
				warnx("invalid RCS keyword substitution mode");
				(usage)();
			}
			break;
		case 'n':
			rcs_setrevstr(&rev_str, rcs_optarg);
			nflag = 1;
			break;
		case 'q':
			rcs_setrevstr(&rev_str, rcs_optarg);
			flags |= QUIET;
			break;
		case 'r':
			rcs_setrevstr(&rev_str, rcs_optarg);
			break;
		case 'T':
			flags |= PRESERVETIME;
			break;
		case 'u':
			rcs_setrevstr(&rev_str, rcs_optarg);
			uflag = 1;
			break;
		case 'V':
			printf("%s\n", rcs_version);
			exit(0);
		case 'x':
			/* Use blank extension if none given. */
			rcs_suffixes = rcs_optarg ? rcs_optarg : "";
			break;
		default:
			(usage)();
		}
	}

	argc -= rcs_optind;
	argv += rcs_optind;

	if ((locker = getlogin()) == NULL)
		err(1, "getlogin");

	if (argc == 0) {
		if ((dirp = opendir(".")) == NULL) {
			warn("opendir");
			(usage)();
		}

		while ((dp = readdir(dirp)) != NULL) {
			if (dp->d_type == DT_DIR)
				continue;
			rcsclean_file(dp->d_name, rev_str);
		}

		(void)closedir(dirp);
	} else
		for (i = 0; i < argc; i++)
			rcsclean_file(argv[i], rev_str);

	return (0);
}

__dead void
rcsclean_usage(void)
{
	fprintf(stderr,
	    "usage: rcsclean [-TV] [-kmode] [-n[rev]] [-q[rev]] [-r[rev]]\n"
	    "                [-u[rev]] [-xsuffixes] [-ztz] [file ...]\n");

	exit(1);
}

static void
rcsclean_file(char *fname, const char *rev_str)
{
	int fd, match;
	RCSFILE *file;
	char fpath[PATH_MAX], numb[RCS_REV_BUFSZ];
	RCSNUM *rev;
	BUF *b1, *b2;
	time_t rcs_mtime = -1;

	b1 = b2 = NULL;
	file = NULL;
	rev = NULL;

	if ((fd = rcs_choosefile(fname, fpath, sizeof(fpath))) < 0)
		goto out;

	if ((file = rcs_open(fpath, fd, RCS_RDWR)) == NULL)
		goto out;

	if (flags & PRESERVETIME)
		rcs_mtime = rcs_get_mtime(file);

	rcs_kwexp_set(file, kflag);

	if (rev_str == NULL)
		rev = file->rf_head;
	else if ((rev = rcs_getrevnum(rev_str, file)) == NULL) {
		warnx("%s: Symbolic name `%s' is undefined.", fpath, rev_str);
		goto out;
	}

	if ((b1 = rcs_getrev(file, rev)) == NULL) {
		warnx("failed to get needed revision");
		goto out;
	}
	if ((b2 = buf_load(fname)) == NULL) {
		warnx("failed to load `%s'", fname);
		goto out;
	}

	/* If buffer lengths are the same, compare contents as well. */
	if (buf_len(b1) != buf_len(b2))
		match = 0;
	else {
		size_t len, n;

		len = buf_len(b1);

		match = 1;
		for (n = 0; n < len; ++n)
			if (buf_getc(b1, n) != buf_getc(b2, n)) {
				match = 0;
				break;
			}
	}

	if (match == 1) {
		if (uflag == 1 && !TAILQ_EMPTY(&(file->rf_locks))) {
			if (!(flags & QUIET) && nflag == 0) {
				printf("rcs -u%s %s\n",
				    rcsnum_tostr(rev, numb, sizeof(numb)),
				    fpath);
			}
			(void)rcs_lock_remove(file, locker, rev);
		}

		if (TAILQ_EMPTY(&(file->rf_locks))) {
			if (!(flags & QUIET))
				printf("rm -f %s\n", fname);

			if (nflag == 0)
				(void)unlink(fname);
		}
	}

	rcs_write(file);
	if (flags & PRESERVETIME)
		rcs_set_mtime(file, rcs_mtime);

out:
	if (b1 != NULL)
		buf_free(b1);
	if (b2 != NULL)
		buf_free(b2);
	if (file != NULL)
		rcs_close(file);
}