1 /* $OpenBSD: rain.c,v 1.22 2021/10/23 11:22:49 mestre Exp $ */
2
3 /*
4 * Copyright (c) 1980, 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 /*
33 * rain 11/3/1980 EPS/CITHEP
34 * cc rain.c -o rain -O -ltermlib
35 */
36
37 #include <curses.h>
38 #include <err.h>
39 #include <signal.h>
40 #include <stdlib.h>
41 #include <termios.h>
42 #include <unistd.h>
43
44 volatile sig_atomic_t sig_caught = 0;
45
46 static void onsig(int);
47
48
49 int
main(int argc,char * argv[])50 main(int argc, char *argv[])
51 {
52 int x, y, j;
53 long tcols, tlines;
54 const char *errstr;
55 struct termios term;
56 struct timespec sleeptime;
57 speed_t speed;
58 time_t delay = 0;
59 int ch;
60 int xpos[5], ypos[5];
61
62 /* set default delay based on terminal baud rate */
63 if (tcgetattr(STDOUT_FILENO, &term) == 0 &&
64 (speed = cfgetospeed(&term)) > B9600)
65 delay = (speed / B9600) - 1;
66
67 while ((ch = getopt(argc, argv, "d:h")) != -1)
68 switch(ch) {
69 case 'd':
70 delay = (time_t)strtonum(optarg, 0, 1000, &errstr);
71 if (errstr)
72 errx(1, "delay (0-1000) is %s: %s", errstr, optarg);
73 break;
74 case 'h':
75 default:
76 (void)fprintf(stderr, "usage: rain [-d delay]\n");
77 return 1;
78 }
79
80 /* Convert delay from ms -> ns */
81 sleeptime.tv_sec = 0;
82 sleeptime.tv_nsec = delay * 500000;
83 timespecadd(&sleeptime, &sleeptime, &sleeptime);
84
85 initscr();
86
87 if (pledge("stdio tty", NULL) == -1)
88 err(1, "pledge");
89
90 tcols = COLS - 4;
91 tlines = LINES - 4;
92
93 (void)signal(SIGHUP, onsig);
94 (void)signal(SIGINT, onsig);
95 (void)signal(SIGQUIT, onsig);
96 (void)signal(SIGSTOP, onsig);
97 (void)signal(SIGTSTP, onsig);
98 (void)signal(SIGTERM, onsig);
99
100 curs_set(0);
101 for (j = 4; j >= 0; --j) {
102 xpos[j] = arc4random_uniform(tcols) + 2;
103 ypos[j] = arc4random_uniform(tlines) + 2;
104 }
105 for (j = 0;;) {
106 if (sig_caught) {
107 endwin();
108 return 0;
109 }
110 x = arc4random_uniform(tcols) + 2;
111 y = arc4random_uniform(tlines) + 2;
112 mvaddch(y, x, '.');
113 mvaddch(ypos[j], xpos[j], 'o');
114 if (!j--)
115 j = 4;
116 mvaddch(ypos[j], xpos[j], 'O');
117 if (!j--)
118 j = 4;
119 mvaddch(ypos[j] - 1, xpos[j], '-');
120 mvaddstr(ypos[j], xpos[j] - 1, "|.|");
121 mvaddch(ypos[j] + 1, xpos[j], '-');
122 if (!j--)
123 j = 4;
124 mvaddch(ypos[j] - 2, xpos[j], '-');
125 mvaddstr(ypos[j] - 1, xpos[j] - 1, "/ \\");
126 mvaddstr(ypos[j], xpos[j] - 2, "| O |");
127 mvaddstr(ypos[j] + 1, xpos[j] - 1, "\\ /");
128 mvaddch(ypos[j] + 2, xpos[j], '-');
129 if (!j--)
130 j = 4;
131 mvaddch(ypos[j] - 2, xpos[j], ' ');
132 mvaddstr(ypos[j] - 1, xpos[j] - 1, " ");
133 mvaddstr(ypos[j], xpos[j] - 2, " ");
134 mvaddstr(ypos[j] + 1, xpos[j] - 1, " ");
135 mvaddch(ypos[j] + 2, xpos[j], ' ');
136 xpos[j] = x;
137 ypos[j] = y;
138 refresh();
139 nanosleep(&sleeptime, NULL);
140 }
141 }
142
143 static void
onsig(int dummy)144 onsig(int dummy)
145 {
146 sig_caught = 1;
147 }
148