* Copyright (c) 1983, 1993

/* $NetBSD: misc.c,v 1.18 2009/03/14 19:35:13 dholland 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. 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.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)misc.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: misc.c,v 1.18 2009/03/14 19:35:13 dholland Exp $");
#endif
#endif /* not lint */

#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "extern.h"
#include "pathnames.h"

#define distance(x,y) \
(abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2)

static int angle(int, int);

/* XXX */
int
range(struct ship *from, struct ship *to)
{
int bow1r, bow1c, bow2r, bow2c;
int stern1r, stern1c, stern2c, stern2r;
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(struct ship *from, int side, int anyship)
{
struct ship *sp;
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;
}

static int
angle(int Dr, int Dc)
{
int 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;
}

/* checks for target bow or stern */
int
gunsbear(struct ship *from, struct ship *to)
{
int Dr, Dc, i;
int 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;
}

/* returns true if fromship is shooting at onship's starboard side */
int
portside(struct ship *from, struct ship *on, int quick)
{
int ang;
int 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;
}

int
colours(struct ship *sp)
{
char flag = '\0';

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((unsigned char)flag);
}

void
logger(struct ship *s)
{
FILE *fp;
int persons;
int n;
struct logs log[NLOG];
float net;
struct logs *lp;

setegid(egid);
if ((fp = fopen(_PATH_LOGFILE, "r+")) == NULL) {
setegid(gid);
return;
}
setegid(gid);
#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(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)
putw(1, fp);
else
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) {
fwrite(log, sizeof (struct logs), lp - log, fp);
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;
fwrite(&log[NLOG-1], sizeof (struct logs), 1, fp);
fwrite(lp, sizeof (struct logs), &log[NLOG-1] - lp, fp);
break;
}
#ifdef LOCK_EX
flock(fileno(fp), LOCK_UN);
#endif
fclose(fp);
}