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      1 /*	$NetBSD: snova.c,v 1.10 2018/02/08 09:05:16 dholland 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 #if 0
     35 static char sccsid[] = "@(#)snova.c	8.1 (Berkeley) 5/31/93";
     36 #else
     37 __RCSID("$NetBSD: snova.c,v 1.10 2018/02/08 09:05:16 dholland Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <stdio.h>
     42 #include <unistd.h>
     43 #include "trek.h"
     44 
     45 /*
     46 **  CAUSE SUPERNOVA TO OCCUR
     47 **
     48 **	A supernova occurs.  If 'ix' < 0, a random quadrant is chosen;
     49 **	otherwise, the current quadrant is taken, and (ix, iy) give
     50 **	the sector quadrants of the star which is blowing up.
     51 **
     52 **	If the supernova turns out to be in the quadrant you are in,
     53 **	you go into "emergency override mode", which tries to get you
     54 **	out of the quadrant as fast as possible.  However, if you
     55 **	don't have enough fuel, or if you by chance run into something,
     56 **	or some such thing, you blow up anyway.  Oh yeh, if you are
     57 **	within two sectors of the star, there is nothing that can
     58 **	be done for you.
     59 **
     60 **	When a star has gone supernova, the quadrant becomes uninhab-
     61 **	itable for the rest of eternity, i.e., the game.  If you ever
     62 **	try stopping in such a quadrant, you will go into emergency
     63 **	override mode.
     64 */
     65 
     66 void
     67 snova(int x, int y)
     68 {
     69 	int		qx, qy;
     70 	int		ix, iy = 0;
     71 	int		f;
     72 	int		dx, dy;
     73 	int		n;
     74 	struct quad	*q;
     75 
     76 	f = 0;
     77 	ix = x;
     78 	if (ix < 0) {
     79 		/* choose a quadrant */
     80 		while (1) {
     81 			qx = ranf(NQUADS);
     82 			qy = ranf(NQUADS);
     83 			q = &Quad[qx][qy];
     84 			if (q->stars > 0)
     85 				break;
     86 		}
     87 		if (Ship.quadx == qx && Ship.quady == qy) {
     88 			/* select a particular star */
     89 			n = ranf(q->stars);
     90 			for (ix = 0; ix < NSECTS; ix++) {
     91 				for (iy = 0; iy < NSECTS; iy++)
     92 					if (Sect[ix][iy] == STAR ||
     93 					    Sect[ix][iy] == INHABIT)
     94 						if ((n -= 1) <= 0)
     95 							break;
     96 				if (n <= 0)
     97 					break;
     98 			}
     99 			f = 1;
    100 		}
    101 	} else {
    102 		/* current quadrant */
    103 		iy = y;
    104 		qx = Ship.quadx;
    105 		qy = Ship.quady;
    106 		q = &Quad[qx][qy];
    107 		f = 1;
    108 	}
    109 	if (f) {
    110 		/* supernova is in same quadrant as Enterprise */
    111 		printf("\a\nRED ALERT: supernova occurring at %d,%d\n", ix, iy);
    112 		dx = ix - Ship.sectx;
    113 		dy = iy - Ship.secty;
    114 		if (dx * dx + dy * dy <= 2) {
    115 			printf("***  Emergency override attem");
    116 			sleep(1);
    117 			printf("\n");
    118 			lose(L_SNOVA);
    119 		}
    120 		q->scanned = 1000;
    121 	} else {
    122 		if (!damaged(SSRADIO)) {
    123 			q->scanned = 1000;
    124 			printf("\nUhura: Captain, Starfleet Command reports "
    125 			       "a supernova\n");
    126 			printf("  in quadrant %d,%d.  Caution is advised\n",
    127 				qx, qy);
    128 		}
    129 	}
    130 
    131 	/* clear out the supernova'ed quadrant */
    132 	dx = q->klings;
    133 	dy = q->stars;
    134 	Now.klings -= dx;
    135 	if (x >= 0) {
    136 		/* Enterprise caused supernova */
    137 		Game.kills += dy;
    138 		if (q->bases)
    139 			killb(qx, qy);
    140 		Game.killk += dx;
    141 	} else {
    142 		if (q->bases)
    143 			killb(qx, qy);
    144 	}
    145 	killd(qx, qy, (x >= 0));
    146 	q->stars = -1;
    147 	q->klings = 0;
    148 	if (Now.klings <= 0) {
    149 		printf("Lucky devil, that supernova destroyed the last "
    150 		       "klingon\n");
    151 		win();
    152 	}
    153 	return;
    154 }
    155