/*
 * Copyright (c) 1980, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University 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 WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

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

#ifndef lint
static char sccsid[] = "@(#)leave.c	5.4 (Berkeley) 07/07/88";
#endif /* not lint */

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

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

	if (argc < 2) {
#define	MSG1	"When do you have to leave? "
		(void)write(1, MSG1, sizeof(MSG1) - 1);
		cp = fgets(buf, sizeof(buf), stdin);
		if (*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 || t->tm_hour > hours ||
		    t->tm_hour == hours && minutes <= t->tm_min)
			usage();
		secs = (hours - t->tm_hour) * 60 * 60;
		secs += (minutes - t->tm_min) * 60;
	}
	doalarm(secs);
	exit(0);
}

static
doalarm(secs)
	u_int secs;
{
	register int bother;
	time_t daytime, time();
	int pid;
	char *ctime();

	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(1, 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(1, 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(1, 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(1, MSG5, sizeof(MSG5) - 1);
	exit(0);
}

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