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      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
     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
    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
    164 onsig(int dummy __unused)
    165 {
    166 	sig_caught = 1;
    167 }
    168