1/*	$NetBSD: snova.c,v 1.8 2009/05/24 21:55:24 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
35static char sccsid[] = "@(#)snova.c	8.1 (Berkeley) 5/31/93";
36#else
37__RCSID("$NetBSD: snova.c,v 1.8 2009/05/24 21:55:24 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
66void
67snova(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 occuring 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