1/*	$NetBSD: leave.c,v 1.14 2008/07/21 14:19:23 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1980, 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
41#else
42__RCSID("$NetBSD: leave.c,v 1.14 2008/07/21 14:19:23 lukem Exp $");
43#endif
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/time.h>
48#include <ctype.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <time.h>
52#include <err.h>
53#include <unistd.h>
54
55#define	SECOND	1
56#define MINUTE	(SECOND * 60)
57#define	HOUR	(MINUTE * 60)
58
59/*
60 * leave [[+]hhmm]
61 *
62 * Reminds you when you have to leave.
63 * Leave prompts for input and goes away if you hit return.
64 * It nags you like a mother hen.
65 */
66
67__dead static void doalarm(u_int);
68__dead static void usage(void);
69
70int
71main(int argc, char **argv)
72{
73	u_int secs;
74	int hours, minutes;
75	char c, *cp;
76	struct tm *t = NULL;
77	time_t now;
78	int plusnow;
79	char buf[50];
80
81	if (setvbuf(stdout, NULL, _IONBF, 0) != 0)
82		errx(1, "Cannot set stdout to unbuffered.");
83
84	if (argc < 2) {
85		(void)puts("When do you have to leave? ");
86		cp = fgets(buf, sizeof(buf), stdin);
87		if (cp == NULL || *cp == '\n')
88			exit(0);
89	} else
90		cp = argv[1];
91
92	if (*cp == '+') {
93		plusnow = 1;
94		++cp;
95	} else {
96		plusnow = 0;
97		(void)time(&now);
98		t = localtime(&now);
99	}
100
101	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
102		if (!isdigit((unsigned char)c))
103			usage();
104		hours = hours * 10 + (c - '0');
105	}
106	minutes = hours % 100;
107	hours /= 100;
108
109	if (minutes < 0 || minutes > 59)
110		usage();
111	if (plusnow)
112		secs = (hours * HOUR) + (minutes * MINUTE);
113	else {
114		if (hours > 23)
115			usage();
116		if (t->tm_hour >= 12)
117			t->tm_hour -= 12;
118		if (hours >= 12)
119			hours -= 12;
120		if (t->tm_hour > hours ||
121		    (t->tm_hour == hours && minutes <= t->tm_min))
122			hours += 12;
123		secs = (hours - t->tm_hour) * HOUR;
124		secs += (minutes - t->tm_min) * MINUTE;
125	}
126	doalarm(secs);
127	exit(0);
128}
129
130static void
131doalarm(u_int secs)
132{
133	int bother;
134	time_t daytime;
135
136	switch (fork()) {
137	case 0:
138		break;
139	case -1:
140		err(1, "Fork failed");
141		/*NOTREACHED*/
142	default:
143		exit(0);
144	}
145
146	(void)time(&daytime);
147	daytime += secs;
148	printf("Alarm set for %.16s. (pid %u)\n",
149	    ctime(&daytime), (unsigned)getpid());
150
151	/*
152	 * if write fails, we've lost the terminal through someone else
153	 * causing a vhangup by logging in.
154	 */
155#define	FIVEMIN	(5 * MINUTE)
156	if (secs >= FIVEMIN) {
157		sleep(secs - FIVEMIN);
158		if (puts("\07\07You have to leave in 5 minutes.\n") == EOF)
159			exit(0);
160		secs = FIVEMIN;
161	}
162
163#define	ONEMIN	(MINUTE)
164	if (secs >= ONEMIN) {
165		sleep(secs - ONEMIN);
166		if (puts("\07\07Just one more minute!\n") == EOF)
167			exit(0);
168	}
169
170	for (bother = 10; bother--;) {
171		sleep((u_int)ONEMIN);
172		if (puts("\07\07Time to leave!\n") == EOF)
173			exit(0);
174	}
175
176	(void)puts("\07\07That was the last time I'll tell you.  Bye.\n");
177	exit(0);
178}
179
180static void
181usage(void)
182{
183	(void)fprintf(stderr, "usage: %s [[+]hhmm]\n", getprogname());
184	exit(1);
185}
186