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Fix 12 hours handling, so that you can say leave 1830 when it is 1800.
(Anything over 1300 is obviously 24 hours based, and interval arithmetic
is much simpler than the old code would make you believe...)

/*	$OpenBSD: leave.c,v 1.4 2000/05/08 16:15:29 espie 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1988, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: leave.c,v 1.4 2000/05/08 16:15:29 espie Exp $";
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>

void	usage __P((void));
void	doalarm __P((u_int secs));

/*
 * 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(argc, argv)
	int argc;
	char **argv;
{
	register u_int secs;
	register int hours, minutes;
	register char c, *cp;
	struct tm *t;
	time_t now;
	int plusnow;
	char buf[50];

	if (argc < 2) {
#define	MSG1	"When do you have to leave? "
		(void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
		cp = fgets(buf, sizeof(buf), stdin);
		if (cp == NULL || *cp == '\n')
			exit(0);
	} else
		cp = argv[1];

	if (*cp == '+') {
		plusnow = 1;
		++cp;
	} else {
		plusnow = 0;
		(void)time(&now);
		t = localtime(&now);
	}

	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
		if (!isdigit(c))
			usage();
		hours = hours * 10 + (c - '0');
	}
	minutes = hours % 100;
	hours /= 100;

	if (minutes < 0 || minutes > 59)
		usage();
	if (plusnow)
		secs = hours * 60 * 60 + minutes * 60;
	else {
		if (hours > 23)
			usage();
		if (t->tm_hour > hours || 
		    (t->tm_hour == hours && t->tm_min >= minutes)) {
			/* determine 24 hours mode */
		    	if (hours >= 13)
				hours += 24;
			else
				hours += 12;
		}

		secs = (hours - t->tm_hour) * 60 * 60;
		secs += (minutes - t->tm_min) * 60;
	}
	doalarm(secs);
	exit(0);
}

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

	if ((pid = fork())) {
		(void)time(&daytime);
		daytime += secs;
		printf("Alarm set for %.16s. (pid %d)\n",
		    ctime(&daytime), pid);
		exit(0);
	}
	sleep((u_int)2);		/* let parent print set message */

	/*
	 * if write fails, we've lost the terminal through someone else
	 * causing a vhangup by logging in.
	 */
#define	FIVEMIN	(5 * 60)
#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
	if (secs >= FIVEMIN) {
		sleep(secs - FIVEMIN);
		if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
			exit(0);
		secs = FIVEMIN;
	}

#define	ONEMIN	(60)
#define	MSG3	"\07\07Just one more minute!\n"
	if (secs >= ONEMIN) {
		sleep(secs - ONEMIN);
		if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
			exit(0);
	}

#define	MSG4	"\07\07Time to leave!\n"
	for (bother = 10; bother--;) {
		sleep((u_int)ONEMIN);
		if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
			exit(0);
	}

#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
	(void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
	exit(0);
}

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