# 2.11BSD/src/games/trek/snova.c

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```/*
* Copyright (c) 1980 Regents of the University of California.
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)snova.c	5.1 (Berkeley) 5/30/85";
#endif not lint

# include	"trek.h"

/*
**  CAUSE SUPERNOVA TO OCCUR
**
**	A supernova occurs.  If 'ix' < 0, a random quadrant is chosen;
**	otherwise, the current quadrant is taken, and (ix, iy) give
**	the sector quadrants of the star which is blowing up.
**
**	If the supernova turns out to be in the quadrant you are in,
**	you go into "emergency override mode", which tries to get you
**	out of the quadrant as fast as possible.  However, if you
**	don't have enough fuel, or if you by chance run into something,
**	or some such thing, you blow up anyway.  Oh yeh, if you are
**	within two sectors of the star, there is nothing that can
**	be done for you.
**
**	When a star has gone supernova, the quadrant becomes uninhab-
**	itable for the rest of eternity, i.e., the game.  If you ever
**	try stopping in such a quadrant, you will go into emergency
**	override mode.
*/

snova(x, y)
int	x, y;
{
int			qx, qy;
register int		ix, iy;
int			f;
int			dx, dy;
int			n;

f = 0;
ix = x;
if (ix < 0)
{
while (1)
{
if (q->stars > 0)
break;
}
{
/* select a particular star */
n = ranf(q->stars);
for (ix = 0; ix < NSECTS; ix++)
{
for (iy = 0; iy < NSECTS; iy++)
if (Sect[ix][iy] == STAR || Sect[ix][iy] == INHABIT)
if ((n -= 1) <= 0)
break;
if (n <= 0)
break;
}
f = 1;
}
}
else
{
iy = y;
f = 1;
}
if (f)
{
/* supernova is in same quadrant as Enterprise */
printf("\nRED ALERT: supernova occuring at %d,%d\n", ix, iy);
dx = ix - Ship.sectx;
dy = iy - Ship.secty;
if (dx * dx + dy * dy <= 2)
{
printf("***  Emergency override attem");
sleep(1);
printf("\n");
lose(L_SNOVA);
}
q->scanned = 1000;
}
else
{
{
q->scanned = 1000;
printf("\nUhura: Captain, Starfleet Command reports a supernova\n");
}
}

/* clear out the supernova'ed quadrant */
dx = q->klings;
dy = q->stars;
Now.klings -= dx;
if (x >= 0)
{
/* Enterprise caused supernova */
Game.kills += dy;
if (q->bases)
killb(qx, qy, -1);
Game.killk += dx;
}
else
if (q->bases)
killb(qx, qy, 0);
killd(qx, qy, (x >= 0));
q->stars = -1;
q->klings = 0;
if (Now.klings <= 0)
{
printf("Lucky devil, that supernova destroyed the last klingon\n");
win();
}
return;
}
```