1 /* $NetBSD: rain.c,v 1.24 2024/02/28 23:24:52 charlotte 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 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)rain.c 8.1 (Berkeley) 5/31/93";
41 #else
42 __RCSID("$NetBSD: rain.c,v 1.24 2024/02/28 23:24:52 charlotte Exp $");
43 #endif
44 #endif /* not lint */
45
46 /*
47 * rain 11/3/1980 EPS/CITHEP
48 * cc rain.c -o rain -O -ltermlib
49 */
50
51 #include <sys/types.h>
52 #include <curses.h>
53 #include <err.h>
54 #include <signal.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <unistd.h>
58 #include <errno.h>
59 #include <limits.h>
60
61 static volatile sig_atomic_t sig_caught = 0;
62 static long cols;
63 static long lines;
64
65 int main(int, char **);
66 static void winupdate(void);
67 static void onsig(int);
68
69
70 int
main(int argc,char ** argv)71 main(int argc, char **argv)
72 {
73 int x, y, j;
74 unsigned int delay = 120000;
75 unsigned long val = 0;
76 int ch;
77 char *ep;
78 int xpos[5], ypos[5];
79
80 while ((ch = getopt(argc, argv, "d:")) != -1)
81 switch (ch) {
82 case 'd':
83 val = strtoul(optarg, &ep, 0);
84 if (ep == optarg || *ep)
85 errx(1, "Invalid delay `%s'", optarg);
86 if (errno == ERANGE && val == ULONG_MAX)
87 err(1, "Invalid delay `%s'", optarg);
88 if (val >= 1000)
89 errx(1, "Invalid delay `%s' (1-999)", optarg);
90 delay = (unsigned int)val * 1000; /* ms -> us */
91 break;
92 default:
93 (void)fprintf(stderr, "Usage: %s [-d delay]\n",
94 getprogname());
95 return 1;
96 }
97
98 if (!initscr())
99 errx(0, "couldn't initialize screen");
100 winupdate();
101
102 (void)signal(SIGHUP, onsig);
103 (void)signal(SIGINT, onsig);
104 (void)signal(SIGTERM, onsig);
105
106 (void)curs_set(0);
107 for (j = 4; j >= 0; --j) {
108 xpos[j] = random() % cols + 2;
109 ypos[j] = random() % lines + 2;
110 }
111 for (j = 0;;) {
112 if (sig_caught) {
113 (void)endwin();
114 exit(0);
115 }
116 if (is_term_resized(LINES, COLS)) {
117 resizeterm(LINES, COLS);
118 winupdate();
119 }
120 x = random() % cols + 2;
121 y = random() % lines + 2;
122 (void)mvaddch(y, x, '.');
123 (void)mvaddch(ypos[j], xpos[j], 'o');
124 if (!j--)
125 j = 4;
126 (void)mvaddch(ypos[j], xpos[j], 'O');
127 if (!j--)
128 j = 4;
129 (void)mvaddch(ypos[j] - 1, xpos[j], '-');
130 (void)mvaddstr(ypos[j], xpos[j] - 1, "|.|");
131 (void)mvaddch(ypos[j] + 1, xpos[j], '-');
132 if (!j--)
133 j = 4;
134 (void)mvaddch(ypos[j] - 2, xpos[j], '-');
135 (void)mvaddstr(ypos[j] - 1, xpos[j] - 1, "/ \\");
136 (void)mvaddstr(ypos[j], xpos[j] - 2, "| O |");
137 (void)mvaddstr(ypos[j] + 1, xpos[j] - 1, "\\ /");
138 (void)mvaddch(ypos[j] + 2, xpos[j], '-');
139 if (!j--)
140 j = 4;
141 (void)mvaddch(ypos[j] - 2, xpos[j], ' ');
142 (void)mvaddstr(ypos[j] - 1, xpos[j] - 1, " ");
143 (void)mvaddstr(ypos[j], xpos[j] - 2, " ");
144 (void)mvaddstr(ypos[j] + 1, xpos[j] - 1, " ");
145 (void)mvaddch(ypos[j] + 2, xpos[j], ' ');
146 xpos[j] = x;
147 ypos[j] = y;
148 (void)refresh();
149 if (delay) (void)usleep(delay);
150 }
151 }
152
153 static void
winupdate(void)154 winupdate(void)
155 {
156 cols = COLS - 4;
157 lines = LINES - 4;
158 if (cols == 0) cols++;
159 if (lines == 0) lines++;
160 }
161
162 /* ARGSUSED */
163 static void
onsig(int dummy __unused)164 onsig(int dummy __unused)
165 {
166 sig_caught = 1;
167 }
168