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 1.3 2006/09/03 17:33:13 pavalos 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 static char strend(char *); 44 static int score(char *, struct ship *, struct ship *, char); 45 static void sail_move(char *, struct ship *, unsigned char *, short *, short *, char *); 46 static void try(char *, char *, int, int, int, int, int, struct ship *, struct ship *, int *, int); 47 static void rmend(char *); 48 49 void 50 thinkofgrapples(void) 51 { 52 struct ship *sp, *sq; 53 char friendly; 54 55 foreachship(sp) { 56 if (sp->file->captain[0] || sp->file->dir == 0) 57 continue; 58 foreachship(sq) { 59 friendly = sp->nationality == capship(sq)->nationality; 60 if (!friendly) { 61 if (sp->file->struck || sp->file->captured != 0) 62 continue; 63 if (range(sp, sq) != 1) 64 continue; 65 if (grappled2(sp, sq)) 66 if (toughmelee(sp, sq, 0, 0)) 67 ungrap(sp, sq); 68 else 69 grap(sp, sq); 70 else if (couldwin(sp, sq)) { 71 grap(sp, sq); 72 sp->file->loadwith = L_GRAPE; 73 } 74 } else 75 ungrap(sp, sq); 76 } 77 } 78 } 79 80 void 81 checkup(void) 82 { 83 struct ship *sp, *sq; 84 char explode, sink; 85 86 foreachship(sp) { 87 if (sp->file->dir == 0) 88 continue; 89 explode = sp->file->explode; 90 sink = sp->file->sink; 91 if (explode != 1 && sink != 1) 92 continue; 93 if (die() < 5) 94 continue; 95 Write(sink == 1 ? W_SINK : W_EXPLODE, sp, 2, 0, 0, 0); 96 Write(W_DIR, sp, 0, 0, 0, 0); 97 if (snagged(sp)) 98 foreachship(sq) 99 cleansnag(sp, sq, 1); 100 if (sink != 1) { 101 makesignal(sp, "exploding!", NULL); 102 foreachship(sq) { 103 if (sp != sq && sq->file->dir && range(sp, sq) < 4) 104 table(RIGGING, L_EXPLODE, sp->specs->guns/13, sq, sp, 6); 105 } 106 } else 107 makesignal(sp, "sinking!", NULL); 108 } 109 } 110 111 void 112 prizecheck(void) 113 { 114 struct ship *sp; 115 116 foreachship(sp) { 117 if (sp->file->captured == 0) 118 continue; 119 if (sp->file->struck || sp->file->dir == 0) 120 continue; 121 if (sp->specs->crew1 + sp->specs->crew2 + sp->specs->crew3 > sp->file->pcrew * 6) { 122 Writestr(W_SIGNAL, sp, "prize crew overthrown"); 123 Write(W_POINTS, sp->file->captured, sp->file->captured->file->points - 2 * sp->specs->pts, 0, 0, 0); 124 Write(W_CAPTURED, sp, -1, 0, 0, 0); 125 } 126 } 127 } 128 129 static char 130 strend(char *str) 131 { 132 char *p; 133 134 for (p = str; *p; p++) 135 ; 136 return p == str ? 0 : p[-1]; 137 } 138 139 void 140 closeon(struct ship *from, struct ship *to, char command[], int ta, int ma, int af) 141 { 142 int high; 143 char temp[10]; 144 145 temp[0] = command[0] = '\0'; 146 high = -30000; 147 try(command, temp, ma, ta, af, ma, from->file->dir, from, to, &high, 0); 148 } 149 150 int dtab[] = {0,1,1,2,3,4,4,5}; /* diagonal distances in x==y */ 151 152 static int 153 score(char movement[], struct ship *ship, struct ship *to, char onlytemp) 154 { 155 char drift; 156 int row, col, dir, total, ran; 157 struct File *fp = ship->file; 158 159 if ((dir = fp->dir) == 0) 160 return 0; 161 row = fp->row; 162 col = fp->col; 163 drift = fp->drift; 164 sail_move(movement, ship, &fp->dir, &fp->row, &fp->col, &drift); 165 if (!*movement) 166 strcpy(movement, "d"); 167 168 ran = range(ship, to); 169 total = -50 * ran; 170 if (ran < 4 && gunsbear(ship, to)) 171 total += 60; 172 if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4) 173 total = -30000; 174 175 if (!onlytemp) { 176 fp->row = row; 177 fp->col = col; 178 fp->dir = dir; 179 } 180 return total; 181 } 182 183 static void 184 sail_move(char *p, struct ship *ship, unsigned char *dir, short *row, short *col, 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 static void 224 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) 225 { 226 int new, n; 227 char st[4]; 228 #define rakeyou (gunsbear(f, t) && !gunsbear(t, f)) 229 230 if ((n = strend(temp)) < '1' || n > '9') 231 for (n = 1; vma - n >= 0; n++) { 232 sprintf(st, "%d", n); 233 strcat(temp, st); 234 new = score(temp, f, t, rakeme); 235 if (new > *high && (!rakeme || rakeyou)) { 236 *high = new; 237 strcpy(command, temp); 238 } 239 try(command, temp, ma-n, ta, af, vma-n, 240 dir, f, t, high, rakeme); 241 rmend(temp); 242 } 243 if ((ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r') || !strlen(temp)) { 244 strcat(temp, "r"); 245 new = score(temp, f, t, rakeme); 246 if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))) { 247 *high = new; 248 strcpy(command, temp); 249 } 250 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); 251 rmend(temp); 252 } 253 if ((ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r') || !strlen(temp)){ 254 strcat(temp, "l"); 255 new = score(temp, f, t, rakeme); 256 if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))){ 257 *high = new; 258 strcpy(command, temp); 259 } 260 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); 261 rmend(temp); 262 } 263 } 264 265 static void 266 rmend(char *str) 267 { 268 char *p; 269 270 for (p = str; *p; p++) 271 ; 272 if (p != str) 273 *--p = 0; 274 } 275