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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: finger.c,v 1.19 2015/01/16 06:40:07 deraadt Exp $	*/

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
 *
 * 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.
 */

/*
 * Luke Mewburn <lukem@netbsd.org> added the following on 961121:
 *    - mail status ("No Mail", "Mail read:...", or "New Mail ...,
 *	Unread since ...".)
 *    - 4 digit phone extensions (3210 is printed as x3210.)
 *    - host/office toggling in short format with -h & -o.
 *    - short day names (`Tue' printed instead of `Jun 21' if the
 *	login time is < 6 days.
 */

/*
 * Finger prints out information about users.  It is not portable since
 * certain fields (e.g. the full user name, office, and phone numbers) are
 * extracted from the gecos field of the passwd file which other UNIXes
 * may not have or may use for other things.
 *
 * There are currently two output formats; the short format is one line
 * per user and displays login name, tty, login time, real name, idle time,
 * and either remote host information (default) or office location/phone
 * number, depending on if -h or -o is used respectively.
 * The long format gives the same information (in a more legible format) as
 * well as home directory, shell, mail info, and .plan/.project files.
 */

#include <sys/file.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
#include <err.h>
#include "finger.h"
#include "extern.h"

time_t now;
int entries, lflag, sflag, mflag, oflag, pplan, Mflag;
char tbuf[1024];
PERSON *htab[HSIZE];
PERSON *phead, *ptail;

int
main(int argc, char *argv[])
{
	extern int optind;
	extern char *__progname;
	int ch;
	char domain[HOST_NAME_MAX+1];
	struct stat sb;

	oflag = 1;		/* default to old "office" behavior */

	while ((ch = getopt(argc, argv, "lmMpsho")) != -1)
		switch(ch) {
		case 'l':
			lflag = 1;		/* long format */
			break;
		case 'm':
			mflag = 1;		/* force exact match of names */
			break;
		case 'M':
			Mflag = 1;		/* allow name matching */
			break;
		case 'p':
			pplan = 1;		/* don't show .plan/.project */
			break;
		case 's':
			sflag = 1;		/* short format */
			break;
		case 'h':
			oflag = 0;		/* remote host info */
			break;
		case 'o':
			oflag = 1;		/* office info */
			break;
		case '?':
		default:
			(void)fprintf(stderr,
			    "usage: %s [-hlMmops] [login ...]\n", __progname);
			exit(1);
		}
	argc -= optind;
	argv += optind;

	/* If a domainname is set, increment mflag. */
	if ((getdomainname(domain, sizeof(domain)) == 0) && domain[0])
		mflag++;
	/* If _PATH_MP_DB is larger than 1MB, increment mflag. */
	if (stat(_PATH_MP_DB, &sb) == 0) {
		if (sb.st_size > 1048576)
			mflag++;
	}

	(void)time(&now);
	setpassent(1);
	if (!*argv) {
		/*
		 * Assign explicit "small" format if no names given and -l
		 * not selected.  Force the -s BEFORE we get names so proper
		 * screening will be done.
		 */
		if (!lflag)
			sflag = 1;	/* if -l not explicit, force -s */
		loginlist();
		if (entries == 0)
			(void)printf("No one logged on.\n");
	} else {
		userlist(argc, argv);
		/*
		 * Assign explicit "large" format if names given and -s not
		 * explicitly stated.  Force the -l AFTER we get names so any
		 * remote finger attempts specified won't be mishandled.
		 */
		if (!sflag)
			lflag = 1;	/* if -s not explicit, force -l */
	}
	if (entries != 0) {
		if (lflag)
			lflag_print();
		else
			sflag_print();
	}
	exit(0);
}

void
loginlist(void)
{
	PERSON *pn;
	struct passwd *pw;
	struct utmp user;
	char name[UT_NAMESIZE + 1];

	if (!freopen(_PATH_UTMP, "r", stdin))
		err(2, _PATH_UTMP);
	name[UT_NAMESIZE] = '\0';
	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
		if (!user.ut_name[0])
			continue;
		if ((pn = find_person(user.ut_name)) == NULL) {
			bcopy(user.ut_name, name, UT_NAMESIZE);
			if ((pw = getpwnam(name)) == NULL)
				continue;
			pn = enter_person(pw);
		}
		enter_where(&user, pn);
	}
	for (pn = phead; lflag && pn != NULL; pn = pn->next)
		enter_lastlog(pn);
}

void
userlist(int argc, char **argv)
{
	int i;
	PERSON *pn;
	PERSON *nethead, **nettail;
	struct utmp user;
	struct passwd *pw;
	int dolocal, *used;

	if (!(used = (int *)calloc((u_int)argc, (u_int)sizeof(int))))
		err(2, "malloc");

	/* pull out all network requests */
	for (i = 0, dolocal = 0, nettail = &nethead; i < argc; i++) {
		if (!strchr(argv[i], '@')) {
			dolocal = 1;
			continue;
		}
		pn = palloc();
		*nettail = pn;
		nettail = &pn->next;
		pn->name = argv[i];
		used[i] = -1;
	}
	*nettail = NULL;

	if (!dolocal)
		goto net;

	/*
	 * traverse the list of possible login names and check the login name
	 * and real name against the name specified by the user.
	 */
	if ((mflag - Mflag) > 0) {
		for (i = 0; i < argc; i++)
			if (used[i] >= 0 && (pw = getpwnam(argv[i]))) {
				enter_person(pw);
				used[i] = 1;
			}
	} else while ((pw = getpwent()) != NULL)
		for (i = 0; i < argc; i++)
			if (used[i] >= 0 &&
			    (!strcasecmp(pw->pw_name, argv[i]) ||
			    match(pw, argv[i]))) {
				enter_person(pw);
				used[i] = 1;
			}

	/* list errors */
	for (i = 0; i < argc; i++)
		if (!used[i])
			warnx("%s: no such user.", argv[i]);

	/* handle network requests */
net:	for (pn = nethead; pn; pn = pn->next) {
		netfinger(pn->name);
		if (pn->next || entries)
			putchar('\n');
	}

	free(used);
	if (entries == 0)
		return;

	/*
	 * Scan thru the list of users currently logged in, saving
	 * appropriate data whenever a match occurs.
	 */
	if (!freopen(_PATH_UTMP, "r", stdin))
		err(1, _PATH_UTMP);
	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
		if (!user.ut_name[0])
			continue;
		if ((pn = find_person(user.ut_name)) == NULL)
			continue;
		enter_where(&user, pn);
	}
	for (pn = phead; pn != NULL; pn = pn->next)
		enter_lastlog(pn);
}