leave.c revision 198847 
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
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/usr.bin/leave/leave.c 198847 2009-11-03 09:25:08Z delphij $");
47
48#include <err.h>
49#include <ctype.h>
50#include <locale.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <time.h>
54#include <unistd.h>
55
56static void doalarm(u_int);
57static void usage(void);
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 */
66int
67main(int argc, char **argv)
68{
69	u_int secs;
70	int hours, minutes;
71	char c, *cp = NULL;
72	struct tm *t;
73	time_t now;
74	int plusnow, t_12_hour;
75	char buf[50];
76
77	if (setlocale(LC_TIME, "") == NULL)
78		warn("setlocale");
79
80	if (argc < 2) {
81#define	MSG1	"When do you have to leave? "
82		(void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
83		cp = fgets(buf, sizeof(buf), stdin);
84		if (cp == NULL || *cp == '\n')
85			exit(0);
86	} else if (argc > 2)
87		usage();
88	else
89		cp = argv[1];
90
91	if (*cp == '+') {
92		plusnow = 1;
93		++cp;
94	} else
95		plusnow = 0;
96
97	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
98		if (!isdigit(c))
99			usage();
100		hours = hours * 10 + (c - '0');
101	}
102	minutes = hours % 100;
103	hours /= 100;
104
105	if (minutes < 0 || minutes > 59)
106		usage();
107	if (plusnow)
108		secs = hours * 60 * 60 + minutes * 60;
109	else {
110		(void)time(&now);
111		t = localtime(&now);
112
113		if (hours > 23)
114			usage();
115
116		/* Convert tol to 12 hr time (0:00...11:59) */
117		if (hours > 11)
118			hours -= 12;
119
120		/* Convert tm to 12 hr time (0:00...11:59) */
121		if (t->tm_hour > 11)
122			t_12_hour = t->tm_hour - 12;
123		else
124			t_12_hour = t->tm_hour;
125
126		if (hours < t_12_hour ||
127	 	   (hours == t_12_hour && minutes <= t->tm_min))
128			/* Leave time is in the past so we add 12 hrs */
129			hours += 12;
130
131		secs = (hours - t_12_hour) * 60 * 60;
132		secs += (minutes - t->tm_min) * 60;
133		secs -= now % 60;	/* truncate (now + secs) to min */
134	}
135	doalarm(secs);
136	exit(0);
137}
138
139void
140doalarm(u_int secs)
141{
142	int bother;
143	time_t daytime;
144	char tb[80];
145	int pid;
146
147	if ((pid = fork())) {
148		(void)time(&daytime);
149		daytime += secs;
150		strftime(tb, sizeof(tb), "%+", localtime(&daytime));
151		printf("Alarm set for %s. (pid %d)\n", tb, pid);
152		exit(0);
153	}
154	sleep((u_int)2);		/* let parent print set message */
155	if (secs >= 2)
156		secs -= 2;
157
158	/*
159	 * if write fails, we've lost the terminal through someone else
160	 * causing a vhangup by logging in.
161	 */
162#define	FIVEMIN	(5 * 60)
163#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
164	if (secs >= FIVEMIN) {
165		sleep(secs - FIVEMIN);
166		if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
167			exit(0);
168		secs = FIVEMIN;
169	}
170
171#define	ONEMIN	(60)
172#define	MSG3	"\07\07Just one more minute!\n"
173	if (secs >= ONEMIN) {
174		sleep(secs - ONEMIN);
175		if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
176			exit(0);
177	}
178
179#define	MSG4	"\07\07Time to leave!\n"
180	for (bother = 10; bother--;) {
181		sleep((u_int)ONEMIN);
182		if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
183			exit(0);
184	}
185
186#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
187	(void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
188	exit(0);
189}
190
191static void
192usage(void)
193{
194	fprintf(stderr, "usage: leave [[+]hhmm]\n");
195	exit(1);
196}
197