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#include <err.h>
33#include <ctype.h>
34#include <locale.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <time.h>
38#include <unistd.h>
39
40static void doalarm(u_int);
41static void usage(void) __dead2;
42
43/*
44 * leave [[+]hhmm]
45 *
46 * Reminds you when you have to leave.
47 * Leave prompts for input and goes away if you hit return.
48 * It nags you like a mother hen.
49 */
50int
51main(int argc, char **argv)
52{
53	u_int secs;
54	int hours, minutes;
55	char c, *cp = NULL;
56	struct tm *t;
57	time_t now;
58	int plusnow, t_12_hour;
59	char buf[50];
60
61	if (setlocale(LC_TIME, "") == NULL)
62		warn("setlocale");
63
64	if (argc < 2) {
65#define	MSG1	"When do you have to leave? "
66		(void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
67		cp = fgets(buf, sizeof(buf), stdin);
68		if (cp == NULL || *cp == '\n')
69			exit(0);
70	} else if (argc > 2)
71		usage();
72	else
73		cp = argv[1];
74
75	if (*cp == '+') {
76		plusnow = 1;
77		++cp;
78	} else
79		plusnow = 0;
80
81	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
82		if (!isdigit(c))
83			usage();
84		hours = hours * 10 + (c - '0');
85	}
86	minutes = hours % 100;
87	hours /= 100;
88
89	if (minutes < 0 || minutes > 59)
90		usage();
91	if (plusnow)
92		secs = hours * 60 * 60 + minutes * 60;
93	else {
94		(void)time(&now);
95		t = localtime(&now);
96
97		if (hours > 23)
98			usage();
99
100		/* Convert tol to 12 hr time (0:00...11:59) */
101		if (hours > 11)
102			hours -= 12;
103
104		/* Convert tm to 12 hr time (0:00...11:59) */
105		if (t->tm_hour > 11)
106			t_12_hour = t->tm_hour - 12;
107		else
108			t_12_hour = t->tm_hour;
109
110		if (hours < t_12_hour ||
111	 	   (hours == t_12_hour && minutes <= t->tm_min))
112			/* Leave time is in the past so we add 12 hrs */
113			hours += 12;
114
115		secs = (hours - t_12_hour) * 60 * 60;
116		secs += (minutes - t->tm_min) * 60;
117		secs -= now % 60;	/* truncate (now + secs) to min */
118	}
119	doalarm(secs);
120	exit(0);
121}
122
123void
124doalarm(u_int secs)
125{
126	int bother;
127	time_t daytime;
128	char tb[80];
129	int pid;
130
131	if ((pid = fork())) {
132		(void)time(&daytime);
133		daytime += secs;
134		strftime(tb, sizeof(tb), "%+", localtime(&daytime));
135		printf("Alarm set for %s. (pid %d)\n", tb, pid);
136		exit(0);
137	}
138	sleep((u_int)2);		/* let parent print set message */
139	if (secs >= 2)
140		secs -= 2;
141
142	/*
143	 * if write fails, we've lost the terminal through someone else
144	 * causing a vhangup by logging in.
145	 */
146#define	FIVEMIN	(5 * 60)
147#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
148	if (secs >= FIVEMIN) {
149		sleep(secs - FIVEMIN);
150		if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
151			exit(0);
152		secs = FIVEMIN;
153	}
154
155#define	ONEMIN	(60)
156#define	MSG3	"\07\07Just one more minute!\n"
157	if (secs >= ONEMIN) {
158		sleep(secs - ONEMIN);
159		if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
160			exit(0);
161	}
162
163#define	MSG4	"\07\07Time to leave!\n"
164	for (bother = 10; bother--;) {
165		sleep((u_int)ONEMIN);
166		if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
167			exit(0);
168	}
169
170#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
171	(void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
172	exit(0);
173}
174
175static void
176usage(void)
177{
178	fprintf(stderr, "usage: leave [[+]hhmm]\n");
179	exit(1);
180}
181