4.3BSD-Tahoe/usr/src/games/sail/dr_2.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)dr_2.c 5.3 (Berkeley) 6/18/88";
#endif /* not lint */
#include "driver.h"
#define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
thinkofgrapples()
{
register struct ship *sp, *sq;
char friendly;
foreachship(sp) {
if (sp->file->captain[0] || sp->file->dir == 0)
continue;
foreachship(sq) {
friendly = sp->nationality == capship(sq)->nationality;
if (!friendly) {
if (sp->file->struck || sp->file->captured != 0)
continue;
if (range(sp, sq) != 1)
continue;
if (grappled2(sp, sq))
if (toughmelee(sp, sq, 0, 0))
ungrap(sp, sq);
else
grap(sp, sq);
else if (couldwin(sp, sq)) {
grap(sp, sq);
sp->file->loadwith = L_GRAPE;
}
} else
ungrap(sp, sq);
}
}
}
checkup()
{
register struct ship *sp, *sq;
register char explode, sink;
foreachship(sp) {
if (sp->file->dir == 0)
continue;
explode = sp->file->explode;
sink = sp->file->sink;
if (explode != 1 && sink != 1)
continue;
if (die() < 5)
continue;
Write(sink == 1 ? W_SINK : W_EXPLODE, sp, 0, 2, 0, 0, 0);
Write(W_DIR, sp, 0, 0, 0, 0, 0);
if (snagged(sp))
foreachship(sq)
cleansnag(sp, sq, 1);
if (sink != 1) {
makesignal(sp, "exploding!", (struct ship *)0);
foreachship(sq) {
if (sp != sq && sq->file->dir && range(sp, sq) < 4)
table(RIGGING, L_EXPLODE, sp->specs->guns/13, sq, sp, 6);
}
} else
makesignal(sp, "sinking!", (struct ship *)0);
}
}
prizecheck()
{
register struct ship *sp;
foreachship(sp) {
if (sp->file->captured == 0)
continue;
if (sp->file->struck || sp->file->dir == 0)
continue;
if (sp->specs->crew1 + sp->specs->crew2 + sp->specs->crew3 > sp->file->pcrew * 6) {
Write(W_SIGNAL, sp, 1,
(int)"prize crew overthrown", 0, 0, 0);
Write(W_POINTS, sp->file->captured, 0, sp->file->captured->file->points - 2 * sp->specs->pts, 0, 0, 0);
Write(W_CAPTURED, sp, 0, -1, 0, 0, 0);
}
}
}
strend(str)
char *str;
{
register char *p;
for (p = str; *p; p++)
;
return p == str ? 0 : p[-1];
}
closeon(from, to, command, ta, ma, af)
register struct ship *from, *to;
char command[];
int ma, ta, af;
{
int high;
char temp[10];
temp[0] = command[0] = '\0';
high = -30000;
try(command, temp, ma, ta, af, ma, from->file->dir, from, to, &high, 0);
}
int dtab[] = {0,1,1,2,3,4,4,5}; /* diagonal distances in x==y */
score(movement, ship, to, onlytemp)
char movement[];
register struct ship *ship, *to;
char onlytemp;
{
char drift;
int row, col, dir, total, ran;
register struct File *fp = ship->file;
if ((dir = fp->dir) == 0)
return 0;
row = fp->row;
col = fp->col;
drift = fp->drift;
move(movement, ship, &fp->dir, &fp->row, &fp->col, &drift);
if (!*movement)
(void) strcpy(movement, "d");
ran = range(ship, to);
total = -50 * ran;
if (ran < 4 && gunsbear(ship, to))
total += 60;
if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4)
total = -30000;
if (!onlytemp) {
fp->row = row;
fp->col = col;
fp->dir = dir;
}
return total;
}
move(p, ship, dir, row, col, drift)
register char *p;
register struct ship *ship;
register char *dir;
register short *row, *col;
register char *drift;
{
int dist;
char moved = 0;
for (; *p; p++) {
switch (*p) {
case 'r':
if (++*dir == 9)
*dir = 1;
break;
case 'l':
if (--*dir == 0)
*dir = 8;
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7':
moved++;
if (*dir % 2 == 0)
dist = dtab[*p - '0'];
else
dist = *p - '0';
*row -= dr[*dir] * dist;
*col -= dc[*dir] * dist;
break;
}
}
if (!moved) {
if (windspeed != 0 && ++*drift > 2) {
if (ship->specs->class >= 3 && !snagged(ship)
|| (turn & 1) == 0) {
*row -= dr[winddir];
*col -= dc[winddir];
}
}
} else
*drift = 0;
}
try(command, temp, ma, ta, af, vma, dir, f, t, high, rakeme)
register struct ship *f, *t;
int ma, ta, af, *high, rakeme;
char command[], temp[];
{
register int new, n;
char st[4];
#define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
if ((n = strend(temp)) < '1' || n > '9')
for (n = 1; vma - n >= 0; n++) {
(void) sprintf(st, "%d", n);
(void) strcat(temp, st);
new = score(temp, f, t, rakeme);
if (new > *high && (!rakeme || rakeyou)) {
*high = new;
(void) strcpy(command, temp);
}
try(command, temp, ma-n, ta, af, vma-n,
dir, f, t, high, rakeme);
rmend(temp);
}
if (ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r' || !strlen(temp)) {
(void) strcat(temp, "r");
new = score(temp, f, t, rakeme);
if (new > *high && (!rakeme || gunsbear(f, t) && !gunsbear(t, f))) {
*high = new;
(void) strcpy(command, temp);
}
try(command, temp, ma-1, ta-1, af, min(ma-1, maxmove(f, (dir == 8 ? 1 : dir+1), 0)), (dir == 8 ? 1 : dir+1),f,t,high,rakeme);
rmend(temp);
}
if ((ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r') || !strlen(temp)){
(void) strcat(temp, "l");
new = score(temp, f, t, rakeme);
if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))){
*high = new;
(void) strcpy(command, temp);
}
try(command, temp, ma-1, ta-1, af, (min(ma-1,maxmove(f, (dir-1 ? dir-1 : 8), 0))), (dir-1 ? dir -1 : 8), f, t, high, rakeme);
rmend(temp);
}
}
rmend(str)
char *str;
{
register char *p;
for (p = str; *p; p++)
;
if (p != str)
*--p = 0;
}