1/*	$OpenBSD: snova.c,v 1.8 2016/01/07 14:37:51 mestre Exp $	*/
2/*	$NetBSD: snova.c,v 1.3 1995/04/22 10:59:29 cgd Exp $	*/
3
4/*
5 * Copyright (c) 1980, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <stdio.h>
34#include <unistd.h>
35
36#include "trek.h"
37
38/*
39**  CAUSE SUPERNOVA TO OCCUR
40**
41**	A supernova occurs.  If 'ix' < 0, a random quadrant is chosen;
42**	otherwise, the current quadrant is taken, and (ix, iy) give
43**	the sector quadrants of the star which is blowing up.
44**
45**	If the supernova turns out to be in the quadrant you are in,
46**	you go into "emergency override mode", which tries to get you
47**	out of the quadrant as fast as possible.  However, if you
48**	don't have enough fuel, or if you by chance run into something,
49**	or some such thing, you blow up anyway.  Oh yeh, if you are
50**	within two sectors of the star, there is nothing that can
51**	be done for you.
52**
53**	When a star has gone supernova, the quadrant becomes uninhab-
54**	itable for the rest of eternity, i.e., the game.  If you ever
55**	try stopping in such a quadrant, you will go into emergency
56**	override mode.
57*/
58
59void
60snova(int x, int y)
61{
62	int		qx, qy;
63	int		ix, iy = 0;
64	int		f, n;
65	int		dx, dy;
66	struct quad	*q;
67
68	f = 0;
69	ix = x;
70	if (ix < 0)
71	{
72		/* choose a quadrant */
73		while (1)
74		{
75			qx = ranf(NQUADS);
76			qy = ranf(NQUADS);
77			q = &Quad[qx][qy];
78			if (q->stars > 0)
79				break;
80		}
81		if (Ship.quadx == qx && Ship.quady == qy)
82		{
83			/* select a particular star */
84			n = ranf(q->stars);
85			for (ix = 0; ix < NSECTS; ix++)
86			{
87				for (iy = 0; iy < NSECTS; iy++)
88					if (Sect[ix][iy] == STAR || Sect[ix][iy] == INHABIT)
89						if ((n -= 1) <= 0)
90							break;
91				if (n <= 0)
92					break;
93			}
94			f = 1;
95		}
96	}
97	else
98	{
99		/* current quadrant */
100		iy = y;
101		qx = Ship.quadx;
102		qy = Ship.quady;
103		q = &Quad[qx][qy];
104		f = 1;
105	}
106	if (f)
107	{
108		/* supernova is in same quadrant as Enterprise */
109		printf("\a\nRED ALERT: supernova occuring at %d,%d\n", ix, iy);
110		dx = ix - Ship.sectx;
111		dy = iy - Ship.secty;
112		if (dx * dx + dy * dy <= 2)
113		{
114			printf("***  Emergency override attem");
115			sleep(1);
116			printf("\n");
117			lose(L_SNOVA);
118		}
119		q->scanned = 1000;
120	}
121	else
122	{
123		if (!damaged(SSRADIO))
124		{
125			q->scanned = 1000;
126			printf("\nUhura: Captain, Starfleet Command reports a supernova\n");
127			printf("  in quadrant %d,%d.  Caution is advised\n", 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	{
137		/* Enterprise caused supernova */
138		Game.kills += dy;
139		if (q->bases)
140			killb(qx, qy);
141		Game.killk += dx;
142	}
143	else
144		if (q->bases)
145			killb(qx, qy);
146	killd(qx, qy, (x >= 0));
147	q->stars = -1;
148	q->klings = 0;
149	if (Now.klings <= 0)
150	{
151		printf("Lucky devil, that supernova destroyed the last klingon\n");
152		win();
153	}
154}
155