1/*
2 * Copyright (c) 1980, 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1980, 1988, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
39#endif
40#endif /* not lint */
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD$");
43
44#include <err.h>
45#include <ctype.h>
46#include <locale.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <time.h>
50#include <unistd.h>
51
52static void doalarm(u_int);
53static void usage(void);
54
55/*
56 * leave [[+]hhmm]
57 *
58 * Reminds you when you have to leave.
59 * Leave prompts for input and goes away if you hit return.
60 * It nags you like a mother hen.
61 */
62int
63main(int argc, char **argv)
64{
65	u_int secs;
66	int hours, minutes;
67	char c, *cp = NULL;
68	struct tm *t;
69	time_t now;
70	int plusnow, t_12_hour;
71	char buf[50];
72
73	if (setlocale(LC_TIME, "") == NULL)
74		warn("setlocale");
75
76	if (argc < 2) {
77#define	MSG1	"When do you have to leave? "
78		(void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
79		cp = fgets(buf, sizeof(buf), stdin);
80		if (cp == NULL || *cp == '\n')
81			exit(0);
82	} else if (argc > 2)
83		usage();
84	else
85		cp = argv[1];
86
87	if (*cp == '+') {
88		plusnow = 1;
89		++cp;
90	} else
91		plusnow = 0;
92
93	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
94		if (!isdigit(c))
95			usage();
96		hours = hours * 10 + (c - '0');
97	}
98	minutes = hours % 100;
99	hours /= 100;
100
101	if (minutes < 0 || minutes > 59)
102		usage();
103	if (plusnow)
104		secs = hours * 60 * 60 + minutes * 60;
105	else {
106		(void)time(&now);
107		t = localtime(&now);
108
109		if (hours > 23)
110			usage();
111
112		/* Convert tol to 12 hr time (0:00...11:59) */
113		if (hours > 11)
114			hours -= 12;
115
116		/* Convert tm to 12 hr time (0:00...11:59) */
117		if (t->tm_hour > 11)
118			t_12_hour = t->tm_hour - 12;
119		else
120			t_12_hour = t->tm_hour;
121
122		if (hours < t_12_hour ||
123	 	   (hours == t_12_hour && minutes <= t->tm_min))
124			/* Leave time is in the past so we add 12 hrs */
125			hours += 12;
126
127		secs = (hours - t_12_hour) * 60 * 60;
128		secs += (minutes - t->tm_min) * 60;
129		secs -= now % 60;	/* truncate (now + secs) to min */
130	}
131	doalarm(secs);
132	exit(0);
133}
134
135void
136doalarm(u_int secs)
137{
138	int bother;
139	time_t daytime;
140	char tb[80];
141	int pid;
142
143	if ((pid = fork())) {
144		(void)time(&daytime);
145		daytime += secs;
146		strftime(tb, sizeof(tb), "%+", localtime(&daytime));
147		printf("Alarm set for %s. (pid %d)\n", tb, pid);
148		exit(0);
149	}
150	sleep((u_int)2);		/* let parent print set message */
151	if (secs >= 2)
152		secs -= 2;
153
154	/*
155	 * if write fails, we've lost the terminal through someone else
156	 * causing a vhangup by logging in.
157	 */
158#define	FIVEMIN	(5 * 60)
159#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
160	if (secs >= FIVEMIN) {
161		sleep(secs - FIVEMIN);
162		if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
163			exit(0);
164		secs = FIVEMIN;
165	}
166
167#define	ONEMIN	(60)
168#define	MSG3	"\07\07Just one more minute!\n"
169	if (secs >= ONEMIN) {
170		sleep(secs - ONEMIN);
171		if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
172			exit(0);
173	}
174
175#define	MSG4	"\07\07Time to leave!\n"
176	for (bother = 10; bother--;) {
177		sleep((u_int)ONEMIN);
178		if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
179			exit(0);
180	}
181
182#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
183	(void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
184	exit(0);
185}
186
187static void
188usage(void)
189{
190	fprintf(stderr, "usage: leave [[+]hhmm]\n");
191	exit(1);
192}
193