2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)dr_2.c 8.1 (Berkeley) 5/31/93
30 * $FreeBSD: src/games/sail/dr_2.c,v 1.6 1999/11/30 03:49:32 billf Exp $
31 * $DragonFly: src/games/sail/dr_2.c,v 1.3 2006/09/03 17:33:13 pavalos Exp $
37 #define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
39 static char strend(char *);
40 static int score(char *, struct ship
*, struct ship
*, char);
41 static void sail_move(char *, struct ship
*, unsigned char *, short *, short *, char *);
42 static void try(char *, char *, int, int, int, int, int, struct ship
*, struct ship
*, int *, int);
43 static void rmend(char *);
45 int dtab
[] = {0,1,1,2,3,4,4,5}; /* diagonal distances in x==y */
54 if (sp
->file
->captain
[0] || sp
->file
->dir
== 0)
57 friendly
= sp
->nationality
== capship(sq
)->nationality
;
59 if (sp
->file
->struck
|| sp
->file
->captured
!= 0)
61 if (range(sp
, sq
) != 1)
63 if (grappled2(sp
, sq
)) {
64 if (toughmelee(sp
, sq
, 0, 0))
68 } else if (couldwin(sp
, sq
)) {
70 sp
->file
->loadwith
= L_GRAPE
;
85 if (sp
->file
->dir
== 0)
87 explode
= sp
->file
->explode
;
88 sink
= sp
->file
->sink
;
89 if (explode
!= 1 && sink
!= 1)
93 Write(sink
== 1 ? W_SINK
: W_EXPLODE
, sp
, 2, 0, 0, 0);
94 Write(W_DIR
, sp
, 0, 0, 0, 0);
99 makesignal(sp
, "exploding!", NULL
);
101 if (sp
!= sq
&& sq
->file
->dir
&&
103 table(RIGGING
, L_EXPLODE
,
104 sp
->specs
->guns
/13, sq
, sp
, 6);
107 makesignal(sp
, "sinking!", NULL
);
117 if (sp
->file
->captured
== 0)
119 if (sp
->file
->struck
|| sp
->file
->dir
== 0)
121 if (sp
->specs
->crew1
+ sp
->specs
->crew2
+ sp
->specs
->crew3
>
122 sp
->file
->pcrew
* 6) {
123 Writestr(W_SIGNAL
, sp
, "prize crew overthrown");
124 Write(W_POINTS
, sp
->file
->captured
, sp
->file
->captured
->file
->points
- 2 * sp
->specs
->pts
, 0, 0, 0);
125 Write(W_CAPTURED
, sp
, -1, 0, 0, 0);
135 for (p
= str
; *p
; p
++)
137 return p
== str
? 0 : p
[-1];
141 closeon(struct ship
*from
, struct ship
*to
, char command
[], int ta
, int ma
, int af
)
146 temp
[0] = command
[0] = '\0';
148 try(command
, temp
, ma
, ta
, af
, ma
, from
->file
->dir
, from
, to
, &high
, 0);
152 score(char movement
[], struct ship
*ship
, struct ship
*to
, char onlytemp
)
155 int row
, col
, dir
, total
, ran
;
156 struct File
*fp
= ship
->file
;
158 if ((dir
= fp
->dir
) == 0)
163 sail_move(movement
, ship
, &fp
->dir
, &fp
->row
, &fp
->col
, &drift
);
165 strcpy(movement
, "d");
167 ran
= range(ship
, to
);
169 if (ran
< 4 && gunsbear(ship
, to
))
171 if ((ran
= portside(ship
, to
, 1) - fp
->dir
) == 4 || ran
== -4)
183 sail_move(char *p
, struct ship
*ship
, unsigned char *dir
, short *row
, short *col
, char *drift
)
198 case '1': case '2': case '3': case '4':
199 case '5': case '6': case '7':
202 dist
= dtab
[*p
- '0'];
205 *row
-= dr
[*dir
] * dist
;
206 *col
-= dc
[*dir
] * dist
;
211 if (windspeed
!= 0 && ++*drift
> 2) {
212 if ((ship
->specs
->class >= 3 && !snagged(ship
))
213 || (turn
& 1) == 0) {
223 try(char command
[], char temp
[], int ma
, int ta
, int af
, int vma
, int dir
, struct ship
*f
, struct ship
*t
, int *high
, int rakeme
)
227 #define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
229 if ((n
= strend(temp
)) < '1' || n
> '9')
230 for (n
= 1; vma
- n
>= 0; n
++) {
231 sprintf(st
, "%d", n
);
233 new = score(temp
, f
, t
, rakeme
);
234 if (new > *high
&& (!rakeme
|| rakeyou
)) {
236 strcpy(command
, temp
);
238 try(command
, temp
, ma
-n
, ta
, af
, vma
-n
,
239 dir
, f
, t
, high
, rakeme
);
242 if ((ma
> 0 && ta
> 0 && (n
= strend(temp
)) != 'l' && n
!= 'r') || !strlen(temp
)) {
244 new = score(temp
, f
, t
, rakeme
);
245 if (new > *high
&& (!rakeme
|| (gunsbear(f
, t
) && !gunsbear(t
, f
)))) {
247 strcpy(command
, temp
);
249 try(command
, temp
, ma
-1, ta
-1, af
,
250 min(ma
-1, maxmove(f
, (dir
== 8 ? 1 : dir
+1), 0)),
251 (dir
== 8 ? 1 : dir
+1), f
, t
, high
, rakeme
);
254 if ((ma
> 0 && ta
> 0 && (n
= strend(temp
)) != 'l' && n
!= 'r') || !strlen(temp
)) {
256 new = score(temp
, f
, t
, rakeme
);
257 if (new > *high
&& (!rakeme
|| (gunsbear(f
, t
) && !gunsbear(t
, f
)))) {
259 strcpy(command
, temp
);
261 try(command
, temp
, ma
-1, ta
-1, af
,
262 (min(ma
-1,maxmove(f
, (dir
-1 ? dir
-1 : 8), 0))),
263 (dir
-1 ? dir
-1 : 8), f
, t
, high
, rakeme
);
273 for (p
= str
; *p
; p
++)