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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: leave.c,v 1.15 2015/01/16 06:40:09 deraadt Exp $	*/
/*	$NetBSD: leave.c,v 1.4 1995/07/03 16:50:13 phil Exp $	*/

/*
 * Copyright (c) 1980, 1988, 1993
 *	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/time.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static __dead void	usage(void);
static void		doalarm(u_int secs);

#define SECOND  1
#define MINUTE  (SECOND * 60)
#define	FIVEMIN	(5 * MINUTE)
#define HOUR    (MINUTE * 60)

/*
 * leave [[+]hhmm]
 *
 * Reminds you when you have to leave.
 * Leave prompts for input and goes away if you hit return.
 * It nags you like a mother hen.
 */
int
main(int argc, char *argv[])
{
	u_int secs;
	int hours, minutes;
	char c, *cp;
	struct tm *t;
	time_t now;
	int plusnow = 0, twentyfour;
	char buf[50];
	
	if (setvbuf(stdout, NULL, _IOLBF, 0) != 0)
		errx(1, "Cannot set stdout to line buffered.");

	if (argc < 2) {
		(void)fputs("When do you have to leave? ", stdout);
		cp = fgets(buf, sizeof(buf), stdin);
		if (cp == NULL || *cp == '\n')
			exit(0);
	} else if (argc > 2)
		usage();
	else
		cp = argv[1];

	if (*cp == '+') {
		plusnow = 1;
		++cp;
	}

	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
		if (!isdigit((unsigned char)c))
			usage();
		hours = hours * 10 + (c - '0');
	}
	minutes = hours % 100;
	hours /= 100;
	/* determine 24 hours mode */
	twentyfour = hours > 12;

	if (minutes < 0 || minutes > 59)
		usage();
	if (plusnow)
		secs = (hours * HOUR) + (minutes * MINUTE);
	else {
		if (hours > 23)
			usage();
		(void)time(&now);
		t = localtime(&now);
		while (t->tm_hour > hours || 
		    (t->tm_hour == hours && t->tm_min >= minutes)) {
			if (twentyfour)
				hours += 24;
			else
				hours += 12;
		}

		secs = (hours - t->tm_hour) * HOUR;
		secs += (minutes - t->tm_min) * MINUTE;
	}
	doalarm(secs);
	exit(0);
}

static void
doalarm(u_int secs)
{
	int bother;
	time_t daytime;
	pid_t pid;

	switch (pid = fork()) {
	case 0:
		break;
	case -1:
		err(1, "Fork failed");
		/* NOTREACHED */
	default:
		(void)time(&daytime);
		daytime += secs;
		printf("Alarm set for %.16s. (pid %ld)\n",
		    ctime(&daytime), (long)pid);
		exit(0);
	}
	sleep(2);			/* let parent print set message */

	/*
	 * if write fails, we've lost the terminal through someone else
	 * causing a vhangup by logging in.
	 */
	if (secs >= FIVEMIN) {
		sleep(secs - FIVEMIN);
		if (puts("\a\aYou have to leave in 5 minutes.") == EOF)
			exit(0);
		secs = FIVEMIN;
	}

	if (secs >= MINUTE) {
		sleep(secs - MINUTE);
		if (puts("\a\aJust one more minute!") == EOF)
			exit(0);
	}

	for (bother = 10; bother--;) {
		sleep(MINUTE);
		if (puts("\a\aTime to leave!") == EOF)
			exit(0);
	}

	puts("\a\aThat was the last time I'll tell you.  Bye.");
	exit(0);
}

static __dead void
usage(void)
{
	fprintf(stderr, "usage: leave [[+]hhmm]\n");
	exit(1);
}