1 /* $OpenBSD: leave.c,v 1.20 2020/01/27 01:05:28 tedu Exp $ */
2 /* $NetBSD: leave.c,v 1.4 1995/07/03 16:50:13 phil Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/time.h>
34 #include <ctype.h>
35 #include <err.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <unistd.h>
40
41 static __dead void usage(void);
42 static void doalarm(u_int secs);
43
44 #define SECOND 1
45 #define MINUTE (SECOND * 60)
46 #define FIVEMIN (5 * MINUTE)
47 #define HOUR (MINUTE * 60)
48
49 /*
50 * leave [[+]hhmm]
51 *
52 * Reminds you when you have to leave.
53 * Leave prompts for input and goes away if you hit return.
54 * It nags you like a mother hen.
55 */
56 int
main(int argc,char * argv[])57 main(int argc, char *argv[])
58 {
59 u_int secs;
60 int hours, minutes;
61 char c, *cp;
62 struct tm *t;
63 time_t now;
64 int plusnow = 0, twentyfour;
65 char buf[50];
66
67 if (pledge("stdio proc", NULL) == -1)
68 err(1, "pledge");
69
70 if (setvbuf(stdout, NULL, _IOLBF, 0) != 0)
71 errx(1, "Cannot set stdout to line buffered.");
72
73 if (argc < 2) {
74 (void)fputs("When do you have to leave? ", stdout);
75 cp = fgets(buf, sizeof(buf), stdin);
76 if (cp == NULL || *cp == '\n')
77 return 0;
78 } else if (argc > 2)
79 usage();
80 else
81 cp = argv[1];
82
83 if (*cp == '+') {
84 plusnow = 1;
85 ++cp;
86 }
87
88 if (!plusnow && strlen(cp) != 4)
89 usage();
90
91 for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
92 if (!isdigit((unsigned char)c))
93 usage();
94 hours = hours * 10 + (c - '0');
95 }
96 minutes = hours % 100;
97 hours /= 100;
98 /* determine 24 hours mode */
99 twentyfour = hours > 12;
100
101 if (minutes < 0 || minutes > 59)
102 usage();
103 if (plusnow)
104 secs = (hours * HOUR) + (minutes * MINUTE);
105 else {
106 if (hours > 23)
107 usage();
108 (void)time(&now);
109 t = localtime(&now);
110 while (t->tm_hour > hours ||
111 (t->tm_hour == hours && t->tm_min >= minutes)) {
112 if (twentyfour)
113 hours += 24;
114 else
115 hours += 12;
116 }
117
118 secs = (hours - t->tm_hour) * HOUR;
119 secs += (minutes - t->tm_min) * MINUTE;
120 secs -= t->tm_sec; /* aim for beginning of minute */
121 }
122 doalarm(secs);
123 return 0;
124 }
125
126 static void
doalarm(u_int secs)127 doalarm(u_int secs)
128 {
129 int bother;
130 time_t daytime;
131 pid_t pid;
132
133 switch (pid = fork()) {
134 case 0:
135 break;
136 case -1:
137 err(1, "Fork failed");
138 /* NOTREACHED */
139 default:
140 (void)time(&daytime);
141 daytime += secs;
142 printf("Alarm set for %.16s. (pid %ld)\n",
143 ctime(&daytime), (long)pid);
144 exit(0);
145 }
146 sleep(2); /* let parent print set message */
147
148 /*
149 * if write fails, we've lost the terminal through someone else
150 * causing a vhangup by logging in.
151 */
152 if (secs >= FIVEMIN) {
153 sleep(secs - FIVEMIN);
154 if (puts("\a\aYou have to leave in 5 minutes.") == EOF)
155 exit(0);
156 secs = FIVEMIN;
157 }
158
159 if (secs >= MINUTE) {
160 sleep(secs - MINUTE);
161 if (puts("\a\aJust one more minute!") == EOF)
162 exit(0);
163 secs = MINUTE;
164 }
165
166 sleep(secs);
167
168 for (bother = 10; bother--;) {
169 if (puts("\a\aTime to leave!") == EOF)
170 exit(0);
171 if (bother)
172 sleep(MINUTE);
173 }
174
175 puts("\a\aThat was the last time I'll tell you. Bye.");
176 exit(0);
177 }
178
179 static __dead void
usage(void)180 usage(void)
181 {
182 fprintf(stderr, "usage: leave [[+]hhmm]\n");
183 exit(1);
184 }
185