1/*
2 * SPDX-License-Identifier: BSD-3-Clause
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#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1980, 1988, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
41#endif
42#endif /* not lint */
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD$");
45
46#include <err.h>
47#include <ctype.h>
48#include <locale.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <time.h>
52#include <unistd.h>
53
54static void doalarm(u_int);
55static void usage(void);
56
57/*
58 * leave [[+]hhmm]
59 *
60 * Reminds you when you have to leave.
61 * Leave prompts for input and goes away if you hit return.
62 * It nags you like a mother hen.
63 */
64int
65main(int argc, char **argv)
66{
67	u_int secs;
68	int hours, minutes;
69	char c, *cp = NULL;
70	struct tm *t;
71	time_t now;
72	int plusnow, t_12_hour;
73	char buf[50];
74
75	if (setlocale(LC_TIME, "") == NULL)
76		warn("setlocale");
77
78	if (argc < 2) {
79#define	MSG1	"When do you have to leave? "
80		(void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
81		cp = fgets(buf, sizeof(buf), stdin);
82		if (cp == NULL || *cp == '\n')
83			exit(0);
84	} else if (argc > 2)
85		usage();
86	else
87		cp = argv[1];
88
89	if (*cp == '+') {
90		plusnow = 1;
91		++cp;
92	} else
93		plusnow = 0;
94
95	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
96		if (!isdigit(c))
97			usage();
98		hours = hours * 10 + (c - '0');
99	}
100	minutes = hours % 100;
101	hours /= 100;
102
103	if (minutes < 0 || minutes > 59)
104		usage();
105	if (plusnow)
106		secs = hours * 60 * 60 + minutes * 60;
107	else {
108		(void)time(&now);
109		t = localtime(&now);
110
111		if (hours > 23)
112			usage();
113
114		/* Convert tol to 12 hr time (0:00...11:59) */
115		if (hours > 11)
116			hours -= 12;
117
118		/* Convert tm to 12 hr time (0:00...11:59) */
119		if (t->tm_hour > 11)
120			t_12_hour = t->tm_hour - 12;
121		else
122			t_12_hour = t->tm_hour;
123
124		if (hours < t_12_hour ||
125	 	   (hours == t_12_hour && minutes <= t->tm_min))
126			/* Leave time is in the past so we add 12 hrs */
127			hours += 12;
128
129		secs = (hours - t_12_hour) * 60 * 60;
130		secs += (minutes - t->tm_min) * 60;
131		secs -= now % 60;	/* truncate (now + secs) to min */
132	}
133	doalarm(secs);
134	exit(0);
135}
136
137void
138doalarm(u_int secs)
139{
140	int bother;
141	time_t daytime;
142	char tb[80];
143	int pid;
144
145	if ((pid = fork())) {
146		(void)time(&daytime);
147		daytime += secs;
148		strftime(tb, sizeof(tb), "%+", localtime(&daytime));
149		printf("Alarm set for %s. (pid %d)\n", tb, pid);
150		exit(0);
151	}
152	sleep((u_int)2);		/* let parent print set message */
153	if (secs >= 2)
154		secs -= 2;
155
156	/*
157	 * if write fails, we've lost the terminal through someone else
158	 * causing a vhangup by logging in.
159	 */
160#define	FIVEMIN	(5 * 60)
161#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
162	if (secs >= FIVEMIN) {
163		sleep(secs - FIVEMIN);
164		if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
165			exit(0);
166		secs = FIVEMIN;
167	}
168
169#define	ONEMIN	(60)
170#define	MSG3	"\07\07Just one more minute!\n"
171	if (secs >= ONEMIN) {
172		sleep(secs - ONEMIN);
173		if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
174			exit(0);
175	}
176
177#define	MSG4	"\07\07Time to leave!\n"
178	for (bother = 10; bother--;) {
179		sleep((u_int)ONEMIN);
180		if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
181			exit(0);
182	}
183
184#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
185	(void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
186	exit(0);
187}
188
189static void
190usage(void)
191{
192	fprintf(stderr, "usage: leave [[+]hhmm]\n");
193	exit(1);
194}
195