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Christos Zoulas agreed to rescind clause 3 and 4 in
NetBSD fsck.8 rev 1.35 fsutil.h rev 1.14 pathnames.h rev 1.2
netgroup_mkdb.8 rev 1.9 netgroup_mkdb.c rev 1.18 str.c rev 1.7
str.h rev 1.4 rdate.8 rev 1.11 rdate.c rev 1.19 extern.h rev 1.14
getnetgrent.c rev 1.41 netgroup.h rev 1.10
fparseln.3 rev 1.4 fparseln.c rev 1.10

our stringlist.c/stringlist.h are derived from getnetgrent.c
rfc868time.c from rdate.c
newfs/pathnames.h from fsck/pathnames.h

https://mail-index.netbsd.org/source-changes/2009/10/21/msg002182.html
Not all files are covered as some had copyright assigned to TNF in 1998.

/*	$OpenBSD: rdate.c,v 1.37 2023/01/04 13:00:11 jsg Exp $	*/
/*	$NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk Exp $	*/

/*
 * Copyright (c) 1994 Christos Zoulas
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
 */

/*
 * rdate.c: Set the date from the specified host
 *
 *	Time is returned as the number of seconds since
 *	midnight January 1st 1900.
 */

#include <sys/socket.h>
#include <sys/time.h>
#include <sys/wait.h>

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <err.h>
#include <string.h>
#include <unistd.h>
#include <time.h>

/* there are systems without libutil; for portability */
#ifndef NO_UTIL
#include <util.h>
#else
#define logwtmp(a,b,c)
#endif

void rfc868time_client(const char *, int, struct timeval *, struct timeval *, int);
void ntp_client(const char *, int, struct timeval *, struct timeval *, int);

extern char    *__progname;
__dead void	usage(void);

struct {
	char message[2048];
	struct timeval new;
	struct timeval adjust;
} pdata;

__dead void
usage(void)
{
	(void) fprintf(stderr, "usage: %s [-46acnopsv] host\n", __progname);
	exit(1);
}

int
main(int argc, char **argv)
{
	int             pr = 0, silent = 0, ntp = 1, verbose = 0;
	int		slidetime = 0, corrleaps = 0;
	char           *hname;
	int             c, p[2], pid;
	int		family = PF_UNSPEC;

	while ((c = getopt(argc, argv, "46psanocv")) != -1) {
		switch (c) {
		case '4':
			family = PF_INET;
			break;

		case '6':
			family = PF_INET6;
			break;

		case 'p':
			pr = 1;
			break;

		case 's':
			silent = 1;
			break;

		case 'a':
			slidetime = 1;
			break;

		case 'n':
			ntp = 1;
			break;

		case 'o':
			ntp = 0;
			break;

		case 'c':
			corrleaps = 1;
			break;

		case 'v':
			verbose = 1;
			break;

		default:
			usage();
		}
	}
	if (argc - 1 != optind)
		usage();
	hname = argv[optind];

	/*
	 * Privilege separation increases safety, with a slight reduction
	 * in precision because the time values have to return over a pipe.
	 */
	if (pipe(p) == -1)
		err(1, "pipe");
	switch ((pid = fork())) {
	case -1:
		err(1, "fork");
		break;
	case 0:
		if (pledge("stdio inet dns", NULL) == -1)
			err(1, "pledge");

		close(p[0]);	/* read side of pipe */
		dup2(p[1], STDIN_FILENO);
		if (p[1] != STDIN_FILENO)
			close(p[1]);
		dup2(STDIN_FILENO, STDOUT_FILENO);
		dup2(STDOUT_FILENO, STDERR_FILENO);
		setvbuf(stdout, NULL, _IOFBF, 0);
		setvbuf(stderr, NULL, _IOFBF, 0);

		if (ntp)
			ntp_client(hname, family, &pdata.new,
			    &pdata.adjust, corrleaps);
		else
			rfc868time_client(hname, family, &pdata.new,
			    &pdata.adjust, corrleaps);

		if (write(STDOUT_FILENO, &pdata, sizeof pdata) != sizeof pdata)
			exit(1);
		exit(0);
	}

	if (pledge("stdio rpath wpath settime", NULL) == -1)
		err(1, "pledge");

	close(p[1]);	/* write side of pipe */
	if (read(p[0], &pdata, sizeof pdata) < 1)
		err(1, "child did not collect time");
	if (waitpid(pid, NULL, 0) == -1)
		err(1, "waitpid");

	/*
	 * A viable timestamp from the child contains no message.
	 */
	if (pdata.message[0]) {
		pdata.message[sizeof(pdata.message)- 1] = '\0';
		write(STDERR_FILENO, pdata.message, strlen(pdata.message));
		exit(1);
	}

	if (!pr) {
		if (!slidetime) {
			logwtmp("|", "date", "");
			if (settimeofday(&pdata.new, NULL) == -1)
				err(1, "Could not set time of day");
			logwtmp("{", "date", "");
		} else {
			if (adjtime(&pdata.adjust, NULL) == -1)
				err(1, "Could not adjust time of day");
		}
	}

	if (pledge("stdio rpath", NULL) == -1)
		err(1, "pledge");

	if (!silent) {
		struct tm      *ltm;
		char		buf[80];
		time_t		tim = pdata.new.tv_sec;
		double		adjsec;

		ltm = localtime(&tim);
		(void) strftime(buf, sizeof buf, "%a %b %e %H:%M:%S %Z %Y\n", ltm);
		(void) fputs(buf, stdout);

		adjsec  = pdata.adjust.tv_sec + pdata.adjust.tv_usec / 1.0e6;

		if (slidetime || verbose) {
			if (ntp)
				(void) fprintf(stdout,
				   "%s: adjust local clock by %.6f seconds\n",
				   __progname, adjsec);
			else
				(void) fprintf(stdout,
				   "%s: adjust local clock by %lld seconds\n",
				   __progname, (long long)pdata.adjust.tv_sec);
		}
	}

	return 0;
}