leave.c revision 77451 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1988, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/leave/leave.c 77451 2001-05-30 02:38:10Z dd $";
46#endif /* not lint */
47
48#include <err.h>
49#include <ctype.h>
50#include <locale.h>
51#include <stdio.h>
52#include <time.h>
53#include <unistd.h>
54
55void doalarm __P((u_int));
56static void usage __P((void));
57
58/*
59 * leave [[+]hhmm]
60 *
61 * Reminds you when you have to leave.
62 * Leave prompts for input and goes away if you hit return.
63 * It nags you like a mother hen.
64 */
65int
66main(argc, argv)
67	int argc;
68	char **argv;
69{
70	register u_int secs;
71	register int hours, minutes;
72	register char c, *cp = NULL;
73	struct tm *t;
74	time_t now;
75	int plusnow, t_12_hour;
76	char buf[50];
77
78	if (setlocale(LC_TIME, "") == NULL)
79		warn("setlocale");
80
81	if (argc < 2) {
82#define	MSG1	"When do you have to leave? "
83		(void)write(1, MSG1, sizeof(MSG1) - 1);
84		cp = fgets(buf, sizeof(buf), stdin);
85		if (cp == NULL || *cp == '\n')
86			exit(0);
87	} else if (argc > 2)
88		usage();
89	else
90		cp = argv[1];
91
92	if (*cp == '+') {
93		plusnow = 1;
94		++cp;
95	} else
96		plusnow = 0;
97
98	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
99		if (!isdigit(c))
100			usage();
101		hours = hours * 10 + (c - '0');
102	}
103	minutes = hours % 100;
104	hours /= 100;
105
106	if (minutes < 0 || minutes > 59)
107		usage();
108	if (plusnow)
109		secs = hours * 60 * 60 + minutes * 60;
110	else {
111		(void)time(&now);
112		t = localtime(&now);
113
114		if (hours > 23)
115			usage();
116
117		/* Convert tol to 12 hr time (0:00...11:59) */
118		if (hours > 11)
119			hours -= 12;
120
121		/* Convert tm to 12 hr time (0:00...11:59) */
122		if (t->tm_hour > 11)
123			t_12_hour = t->tm_hour - 12;
124		else
125			t_12_hour = t->tm_hour;
126
127		if (hours < t_12_hour ||
128	 	   (hours == t_12_hour && minutes <= t->tm_min))
129			/* Leave time is in the past so we add 12 hrs */
130			hours += 12;
131
132		secs = (hours - t_12_hour) * 60 * 60;
133		secs += (minutes - t->tm_min) * 60;
134		secs -= now % 60;	/* truncate (now + secs) to min */
135	}
136	doalarm(secs);
137	exit(0);
138}
139
140void
141doalarm(secs)
142	u_int secs;
143{
144	register int bother;
145	time_t daytime;
146	char tb[80];
147	int pid;
148
149	if ((pid = fork())) {
150		(void)time(&daytime);
151		daytime += secs;
152		strftime(tb, sizeof(tb), "%+", localtime(&daytime));
153		printf("Alarm set for %s. (pid %d)\n", tb, pid);
154		exit(0);
155	}
156	sleep((u_int)2);		/* let parent print set message */
157	if (secs >= 2)
158		secs -= 2;
159
160	/*
161	 * if write fails, we've lost the terminal through someone else
162	 * causing a vhangup by logging in.
163	 */
164#define	FIVEMIN	(5 * 60)
165#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
166	if (secs >= FIVEMIN) {
167		sleep(secs - FIVEMIN);
168		if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
169			exit(0);
170		secs = FIVEMIN;
171	}
172
173#define	ONEMIN	(60)
174#define	MSG3	"\07\07Just one more minute!\n"
175	if (secs >= ONEMIN) {
176		sleep(secs - ONEMIN);
177		if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
178			exit(0);
179	}
180
181#define	MSG4	"\07\07Time to leave!\n"
182	for (bother = 10; bother--;) {
183		sleep((u_int)ONEMIN);
184		if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
185			exit(0);
186	}
187
188#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
189	(void)write(1, MSG5, sizeof(MSG5) - 1);
190	exit(0);
191}
192
193static void
194usage()
195{
196	fprintf(stderr, "usage: leave [[+]hhmm]\n");
197	exit(1);
198}
199