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rain.c revision 1.20 
      1 /*	$NetBSD: rain.c,v 1.20 2008/07/20 01:03:22 lukem 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 1.20 2008/07/20 01:03:22 lukem 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 
     63 int main(int, char **);
     64 static void onsig(int);
     65 
     66 
     67 int
     68 main(int argc, char **argv)
     69 {
     70 	int x, y, j;
     71 	long cols, lines;
     72 	unsigned int delay = 0;
     73 	unsigned long val = 0;
     74 	int ch;
     75 	char *ep;
     76 	int xpos[5], ypos[5];
     77 
     78 	while ((ch = getopt(argc, argv, "d:")) != -1)
     79 		switch (ch) {
     80 		case 'd':
     81 			val = strtoul(optarg, &ep, 0);
     82 			if (ep == optarg || *ep)
     83 				errx(1, "Invalid delay `%s'", optarg);
     84 			if (errno == ERANGE && val == ULONG_MAX)
     85 				err(1, "Invalid delay `%s'", optarg);
     86 			if (val >= 1000)
     87 				errx(1, "Invalid delay `%s' (1-999)", optarg);
     88 			delay = (unsigned int)val * 1000;  /* ms -> us */
     89 			break;
     90 		default:
     91 			(void)fprintf(stderr, "Usage: %s [-d delay]\n",
     92 			    getprogname());
     93 			return 1;
     94 		}
     95 
     96 	(void)initscr();
     97 	cols = COLS - 4;
     98 	lines = LINES - 4;
     99 
    100 	(void)signal(SIGHUP, onsig);
    101 	(void)signal(SIGINT, onsig);
    102 	(void)signal(SIGTERM, onsig);
    103 
    104 	(void)curs_set(0);
    105 	for (j = 4; j >= 0; --j) {
    106 		xpos[j] = random() % cols + 2;
    107 		ypos[j] = random() % lines + 2;
    108 	}
    109 	for (j = 0;;) {
    110 		if (sig_caught) {
    111 			(void)endwin();
    112 			exit(0);
    113 		}
    114 		x = random() % cols + 2;
    115 		y = random() % lines + 2;
    116 		(void)mvaddch(y, x, '.');
    117 		(void)mvaddch(ypos[j], xpos[j], 'o');
    118 		if (!j--)
    119 			j = 4;
    120 		(void)mvaddch(ypos[j], xpos[j], 'O');
    121 		if (!j--)
    122 			j = 4;
    123 		(void)mvaddch(ypos[j] - 1, xpos[j], '-');
    124 		(void)mvaddstr(ypos[j], xpos[j] - 1, "|.|");
    125 		(void)mvaddch(ypos[j] + 1, xpos[j], '-');
    126 		if (!j--)
    127 			j = 4;
    128 		(void)mvaddch(ypos[j] - 2, xpos[j], '-');
    129 		(void)mvaddstr(ypos[j] - 1, xpos[j] - 1, "/ \\");
    130 		(void)mvaddstr(ypos[j], xpos[j] - 2, "| O |");
    131 		(void)mvaddstr(ypos[j] + 1, xpos[j] - 1, "\\ /");
    132 		(void)mvaddch(ypos[j] + 2, xpos[j], '-');
    133 		if (!j--)
    134 			j = 4;
    135 		(void)mvaddch(ypos[j] - 2, xpos[j], ' ');
    136 		(void)mvaddstr(ypos[j] - 1, xpos[j] - 1, "   ");
    137 		(void)mvaddstr(ypos[j], xpos[j] - 2, "     ");
    138 		(void)mvaddstr(ypos[j] + 1, xpos[j] - 1, "   ");
    139 		(void)mvaddch(ypos[j] + 2, xpos[j], ' ');
    140 		xpos[j] = x;
    141 		ypos[j] = y;
    142 		(void)refresh();
    143 		if (delay) (void)usleep(delay);
    144 	}
    145 }
    146 
    147 /* ARGSUSED */
    148 static void
    149 onsig(int dummy __unused)
    150 {
    151 	sig_caught = 1;
    152 }
    153