Explicitly mention in RETURN VALUES that socket() sets
[dragonfly.git] / games / sail / dr_2.c
1 /*
2  * Copyright (c) 1983, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
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. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *      This product includes software developed by the University of
16  *      California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * @(#)dr_2.c   8.1 (Berkeley) 5/31/93
34  * $FreeBSD: src/games/sail/dr_2.c,v 1.6 1999/11/30 03:49:32 billf Exp $
35  * $DragonFly: src/games/sail/dr_2.c,v 1.2 2003/06/17 04:25:25 dillon Exp $
36  */
37
38 #include <string.h>
39 #include "driver.h"
40
41 #define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
42
43 thinkofgrapples()
44 {
45         struct ship *sp, *sq;
46         char friendly;
47
48         foreachship(sp) {
49                 if (sp->file->captain[0] || sp->file->dir == 0)
50                         continue;
51                 foreachship(sq) {
52                         friendly = sp->nationality == capship(sq)->nationality;
53                         if (!friendly) {
54                                 if (sp->file->struck || sp->file->captured != 0)
55                                         continue;
56                                 if (range(sp, sq) != 1)
57                                         continue;
58                                 if (grappled2(sp, sq))
59                                         if (toughmelee(sp, sq, 0, 0))
60                                                 ungrap(sp, sq);
61                                         else
62                                                 grap(sp, sq);
63                                 else if (couldwin(sp, sq)) {
64                                         grap(sp, sq);
65                                         sp->file->loadwith = L_GRAPE;
66                                 }
67                         } else
68                                 ungrap(sp, sq);
69                 }
70         }
71 }
72
73 checkup()
74 {
75         struct ship *sp, *sq;
76         char explode, sink;
77
78         foreachship(sp) {
79                 if (sp->file->dir == 0)
80                         continue;
81                 explode = sp->file->explode;
82                 sink = sp->file->sink;
83                 if (explode != 1 && sink != 1)
84                         continue;
85                 if (die() < 5)
86                         continue;
87                 Write(sink == 1 ? W_SINK : W_EXPLODE, sp, 0, 2, 0, 0, 0);
88                 Write(W_DIR, sp, 0, 0, 0, 0, 0);
89                 if (snagged(sp))
90                         foreachship(sq)
91                                 cleansnag(sp, sq, 1);
92                 if (sink != 1) {
93                         makesignal(sp, "exploding!", (struct ship *)0);
94                         foreachship(sq) {
95                                 if (sp != sq && sq->file->dir && range(sp, sq) < 4)
96                                         table(RIGGING, L_EXPLODE, sp->specs->guns/13, sq, sp, 6);
97                         }
98                 } else
99                         makesignal(sp, "sinking!", (struct ship *)0);
100         }
101 }
102
103 prizecheck()
104 {
105         struct ship *sp;
106
107         foreachship(sp) {
108                 if (sp->file->captured == 0)
109                         continue;
110                 if (sp->file->struck || sp->file->dir == 0)
111                         continue;
112                 if (sp->specs->crew1 + sp->specs->crew2 + sp->specs->crew3 > sp->file->pcrew * 6) {
113                         Write(W_SIGNAL, sp, 1,
114                                 (int)"prize crew overthrown", 0, 0, 0);
115                         Write(W_POINTS, sp->file->captured, 0, sp->file->captured->file->points - 2 * sp->specs->pts, 0, 0, 0);
116                         Write(W_CAPTURED, sp, 0, -1, 0, 0, 0);
117                 }
118         }
119 }
120
121 strend(str)
122 char *str;
123 {
124         char *p;
125
126         for (p = str; *p; p++)
127                 ;
128         return p == str ? 0 : p[-1];
129 }
130
131 closeon(from, to, command, ta, ma, af)
132 struct ship *from, *to;
133 char command[];
134 int ma, ta, af;
135 {
136         int high;
137         char temp[10];
138
139         temp[0] = command[0] = '\0';
140         high = -30000;
141         try(command, temp, ma, ta, af, ma, from->file->dir, from, to, &high, 0);
142 }
143
144 int dtab[] = {0,1,1,2,3,4,4,5};         /* diagonal distances in x==y */
145
146 score(movement, ship, to, onlytemp)
147 char movement[];
148 struct ship *ship, *to;
149 char onlytemp;
150 {
151         char drift;
152         int row, col, dir, total, ran;
153         struct File *fp = ship->file;
154
155         if ((dir = fp->dir) == 0)
156                 return 0;
157         row = fp->row;
158         col = fp->col;
159         drift = fp->drift;
160         sail_move(movement, ship, &fp->dir, &fp->row, &fp->col, &drift);
161         if (!*movement)
162                 (void) strcpy(movement, "d");
163
164         ran = range(ship, to);
165         total = -50 * ran;
166         if (ran < 4 && gunsbear(ship, to))
167                 total += 60;
168         if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4)
169                 total = -30000;
170
171         if (!onlytemp) {
172                 fp->row = row;
173                 fp->col = col;
174                 fp->dir = dir;
175         }
176         return total;
177 }
178
179 sail_move(p, ship, dir, row, col, drift)
180 char *p;
181 struct ship *ship;
182 char *dir;
183 short *row, *col;
184 char *drift;
185 {
186         int dist;
187         char moved = 0;
188
189         for (; *p; p++) {
190                 switch (*p) {
191                 case 'r':
192                         if (++*dir == 9)
193                                 *dir = 1;
194                         break;
195                 case 'l':
196                         if (--*dir == 0)
197                                 *dir = 8;
198                         break;
199                 case '1': case '2': case '3': case '4':
200                 case '5': case '6': case '7':
201                         moved++;
202                         if (*dir % 2 == 0)
203                                 dist = dtab[*p - '0'];
204                         else
205                                 dist = *p - '0';
206                         *row -= dr[*dir] * dist;
207                         *col -= dc[*dir] * dist;
208                         break;
209                 }
210         }
211         if (!moved) {
212                 if (windspeed != 0 && ++*drift > 2) {
213                         if (ship->specs->class >= 3 && !snagged(ship)
214                             || (turn & 1) == 0) {
215                                 *row -= dr[winddir];
216                                 *col -= dc[winddir];
217                         }
218                 }
219         } else
220                 *drift = 0;
221 }
222
223 try(command, temp, ma, ta, af, vma, dir, f, t, high, rakeme)
224 struct ship *f, *t;
225 int ma, ta, af, vma, dir, *high, rakeme;
226 char command[], temp[];
227 {
228         int new, n;
229         char st[4];
230 #define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
231
232         if ((n = strend(temp)) < '1' || n > '9')
233                 for (n = 1; vma - n >= 0; n++) {
234                         (void) sprintf(st, "%d", n);
235                         (void) strcat(temp, st);
236                         new = score(temp, f, t, rakeme);
237                         if (new > *high && (!rakeme || rakeyou)) {
238                                 *high = new;
239                                 (void) strcpy(command, temp);
240                         }
241                         try(command, temp, ma-n, ta, af, vma-n,
242                                 dir, f, t, high, rakeme);
243                         rmend(temp);
244                 }
245         if (ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r' || !strlen(temp)) {
246                 (void) strcat(temp, "r");
247                 new = score(temp, f, t, rakeme);
248                 if (new > *high && (!rakeme || gunsbear(f, t) && !gunsbear(t, f))) {
249                         *high = new;
250                         (void) strcpy(command, temp);
251                 }
252                 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);
253                 rmend(temp);
254         }
255         if ((ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r') || !strlen(temp)){
256                 (void) strcat(temp, "l");
257                 new = score(temp, f, t, rakeme);
258                 if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))){
259                         *high = new;
260                         (void) strcpy(command, temp);
261                 }
262                 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);
263                 rmend(temp);
264         }
265 }
266
267 rmend(str)
268 char *str;
269 {
270         char *p;
271
272         for (p = str; *p; p++)
273                 ;
274         if (p != str)
275                 *--p = 0;
276 }