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/* $NetBSD: misc.c,v 1.3 1995/04/22 10:37:03 cgd Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 5/31/93";
#else
static char rcsid[] = "$NetBSD: misc.c,v 1.3 1995/04/22 10:37:03 cgd Exp $";
#endif
#endif /* not lint */
#include "externs.h"
#include "pathnames.h"
#define distance(x,y) (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2)
/* XXX */
range(from, to)
struct ship *from, *to;
{
register bow1r, bow1c, bow2r, bow2c;
int stern1r, stern1c, stern2c, stern2r;
register int bb, bs, sb, ss, result;
if (!to->file->dir)
return -1;
stern1r = bow1r = from->file->row;
stern1c = bow1c = from->file->col;
stern2r = bow2r = to->file->row;
stern2c = bow2c = to->file->col;
result = bb = distance(bow2r - bow1r, bow2c - bow1c);
if (bb < 5) {
stern2r += dr[to->file->dir];
stern2c += dc[to->file->dir];
stern1r += dr[from->file->dir];
stern1c += dc[from->file->dir];
bs = distance((bow2r - stern1r), (bow2c - stern1c));
sb = distance((bow1r - stern2r), (bow1c - stern2c));
ss = distance((stern2r - stern1r) ,(stern2c - stern1c));
result = min(bb, min(bs, min(sb, ss)));
}
return result;
}
struct ship *
closestenemy(from, side, anyship)
register struct ship *from;
char side, anyship;
{
register struct ship *sp;
register char a;
int olddist = 30000, dist;
struct ship *closest = 0;
a = capship(from)->nationality;
foreachship(sp) {
if (sp == from)
continue;
if (sp->file->dir == 0)
continue;
if (a == capship(sp)->nationality && !anyship)
continue;
if (side && gunsbear(from, sp) != side)
continue;
dist = range(from, sp);
if (dist < olddist) {
closest = sp;
olddist = dist;
}
}
return closest;
}
angle(dr, dc)
register dr, dc;
{
register i;
if (dc >= 0 && dr > 0)
i = 0;
else if (dr <= 0 && dc > 0)
i = 2;
else if (dc <= 0 && dr < 0)
i = 4;
else
i = 6;
dr = abs(dr);
dc = abs(dc);
if ((i == 0 || i == 4) && dc * 2.4 > dr) {
i++;
if (dc > dr * 2.4)
i++;
} else if ((i == 2 || i == 6) && dr * 2.4 > dc) {
i++;
if (dr > dc * 2.4)
i++;
}
return i % 8 + 1;
}
gunsbear(from, to) /* checks for target bow or stern */
register struct ship *from, *to;
{
int Dr, Dc, i;
register ang;
Dr = from->file->row - to->file->row;
Dc = to->file->col - from->file->col;
for (i = 2; i; i--) {
if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1)
ang += 8;
if (ang >= 2 && ang <= 4)
return 'r';
if (ang >= 6 && ang <= 7)
return 'l';
Dr += dr[to->file->dir];
Dc += dc[to->file->dir];
}
return 0;
}
portside(from, on, quick)
register struct ship *from, *on;
int quick; /* returns true if fromship is */
{ /* shooting at onship's starboard side */
register ang;
register Dr, Dc;
Dr = from->file->row - on->file->row;
Dc = on->file->col - from->file->col;
if (quick == -1) {
Dr += dr[on->file->dir];
Dc += dc[on->file->dir];
}
ang = angle(Dr, Dc);
if (quick != 0)
return ang;
ang = (ang + 4 - on->file->dir - 1) % 8 + 1;
return ang < 5;
}
colours(sp)
register struct ship *sp;
{
register char flag;
if (sp->file->struck)
flag = '!';
if (sp->file->explode)
flag = '#';
if (sp->file->sink)
flag = '~';
if (sp->file->struck)
return flag;
flag = *countryname[capship(sp)->nationality];
return sp->file->FS ? flag : tolower(flag);
}
#include <sys/file.h>
log(s)
register struct ship *s;
{
FILE *fp;
int persons;
int n;
struct logs log[NLOG];
float net;
register struct logs *lp;
if ((fp = fopen(_PATH_LOGFILE, "r+")) == NULL)
return;
#ifdef LOCK_EX
if (flock(fileno(fp), LOCK_EX) < 0)
return;
#endif
net = (float)s->file->points / s->specs->pts;
persons = getw(fp);
n = fread((char *)log, sizeof(struct logs), NLOG, fp);
for (lp = &log[n]; lp < &log[NLOG]; lp++)
lp->l_name[0] = lp->l_uid = lp->l_shipnum
= lp->l_gamenum = lp->l_netpoints = 0;
rewind(fp);
if (persons < 0)
(void) putw(1, fp);
else
(void) putw(persons + 1, fp);
for (lp = log; lp < &log[NLOG]; lp++)
if (net > (float)lp->l_netpoints
/ scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) {
(void) fwrite((char *)log,
sizeof (struct logs), lp - log, fp);
(void) strcpy(log[NLOG-1].l_name, s->file->captain);
log[NLOG-1].l_uid = getuid();
log[NLOG-1].l_shipnum = s->file->index;
log[NLOG-1].l_gamenum = game;
log[NLOG-1].l_netpoints = s->file->points;
(void) fwrite((char *)&log[NLOG-1],
sizeof (struct logs), 1, fp);
(void) fwrite((char *)lp,
sizeof (struct logs), &log[NLOG-1] - lp, fp);
break;
}
#ifdef LOCK_EX
(void) flock(fileno(fp), LOCK_UN);
#endif
(void) fclose(fp);
}
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