games/sail/dr_3.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. 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.
  16  *
  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
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)dr_3.c   8.1 (Berkeley) 5/31/93
  30  * $FreeBSD: src/games/sail/dr_3.c,v 1.6 1999/11/30 03:49:32 billf Exp $
  31  * $DragonFly: src/games/sail/dr_3.c,v 1.3 2006/09/03 17:33:13 pavalos Exp $
  32  */
  33
  34 #include "driver.h"
  35
  36 static bool stillmoving(int);
  37 static bool isolated(struct ship *);
  38 static bool push(struct ship *, struct ship *);
  39 static void step(char, struct ship *, char *);
  40
  41 /* move all comp ships */
  42 void
  43 moveall(void)
  44 {
  45         struct ship *sp, *sq;
  46         int n;
  47         int k, l;
  48         int row[NSHIP], col[NSHIP], dir[NSHIP], drift[NSHIP];
  49         char moved[NSHIP];
  50
  51         /*
  52          * first try to create moves for OUR ships
  53          */
  54         foreachship(sp) {
  55                 struct ship *closest;
  56                 int ma, ta;
  57                 char af;
  58
  59                 if (sp->file->captain[0] || sp->file->dir == 0)
  60                         continue;
  61                 if (!sp->file->struck && windspeed && !snagged(sp)
  62                     && sp->specs->crew3) {
  63                         ta = maxturns(sp, &af);
  64                         ma = maxmove(sp, sp->file->dir, 0);
  65                         closest = closestenemy(sp, 0, 0);
  66                         if (closest == 0)
  67                                 *sp->file->movebuf = '\0';
  68                         else
  69                                 closeon(sp, closest, sp->file->movebuf,
  70                                         ta, ma, af);
  71                 } else
  72                         *sp->file->movebuf = '\0';
  73         }
  74         /*
  75          * Then execute the moves for ALL ships (dead ones too),
  76          * checking for collisions and snags at each step.
  77          * The old positions are saved in row[], col[], dir[].
  78          * At the end, we compare and write out the changes.
  79          */
  80         n = 0;
  81         foreachship(sp) {
  82                 if (snagged(sp))
  83                         strcpy(sp->file->movebuf, "d");
  84                 else
  85                         if (*sp->file->movebuf != 'd')
  86                                 strcat(sp->file->movebuf, "d");
  87                 row[n] = sp->file->row;
  88                 col[n] = sp->file->col;
  89                 dir[n] = sp->file->dir;
  90                 drift[n] = sp->file->drift;
  91                 moved[n] = 0;
  92                 n++;
  93         }
  94         /*
  95          * Now resolve collisions.
  96          * This is the tough part.
  97          */
  98         for (k = 0; stillmoving(k); k++) {
  99                 /*
 100                  * Step once.
 101                  * And propagate the nulls at the end of sp->file->movebuf.
 102                  */
 103                 n = 0;
 104                 foreachship(sp) {
 105                         if (!sp->file->movebuf[k])
 106                                 sp->file->movebuf[k+1] = '\0';
 107                         else if (sp->file->dir)
 108                                 step(sp->file->movebuf[k], sp, &moved[n]);
 109                         n++;
 110                 }
 111                 /*
 112                  * The real stuff.
 113                  */
 114                 n = 0;
 115                 foreachship(sp) {
 116                         if (sp->file->dir == 0 || isolated(sp))
 117                                 goto cont1;
 118                         l = 0;
 119                         foreachship(sq) {
 120                                 char snap = 0;
 121
 122                                 if (sp == sq)
 123                                         goto cont2;
 124                                 if (sq->file->dir == 0)
 125                                         goto cont2;
 126                                 if (!push(sp, sq))
 127                                         goto cont2;
 128                                 if (snagged2(sp, sq) && range(sp, sq) > 1)
 129                                         snap++;
 130                                 if (!range(sp, sq) && !fouled2(sp, sq)) {
 131                                         makesignal(sp,
 132                                                 "collision with %s (%c%c)", sq);
 133                                         if (die() < 4) {
 134                                                 makesignal(sp,
 135                                                         "fouled with %s (%c%c)",
 136                                                         sq);
 137                                                 Write(W_FOUL, sp, l, 0, 0, 0);
 138                                                 Write(W_FOUL, sq, n, 0, 0, 0);
 139                                         }
 140                                         snap++;
 141                                 }
 142                                 if (snap) {
 143                                         sp->file->movebuf[k + 1] = 0;
 144                                         sq->file->movebuf[k + 1] = 0;
 145                                         sq->file->row = sp->file->row - 1;
 146                                         if (sp->file->dir == 1
 147                                             || sp->file->dir == 5)
 148                                                 sq->file->col =
 149                                                         sp->file->col - 1;
 150                                         else
 151                                                 sq->file->col = sp->file->col;
 152                                         sq->file->dir = sp->file->dir;
 153                                 }
 154                         cont2:
 155                                 l++;
 156                         }
 157                 cont1:
 158                         n++;
 159                 }
 160         }
 161         /*
 162          * Clear old moves.  And write out new pos.
 163          */
 164         n = 0;
 165         foreachship(sp) {
 166                 if (sp->file->dir != 0) {
 167                         *sp->file->movebuf = 0;
 168                         if (row[n] != sp->file->row)
 169                                 Write(W_ROW, sp, sp->file->row, 0, 0, 0);
 170                         if (col[n] != sp->file->col)
 171                                 Write(W_COL, sp, sp->file->col, 0, 0, 0);
 172                         if (dir[n] != sp->file->dir)
 173                                 Write(W_DIR, sp, sp->file->dir, 0, 0, 0);
 174                         if (drift[n] != sp->file->drift)
 175                                 Write(W_DRIFT, sp, sp->file->drift, 0, 0, 0);
 176                 }
 177                 n++;
 178         }
 179 }
 180
 181 static bool
 182 stillmoving(int k)
 183 {
 184         struct ship *sp;
 185
 186         foreachship(sp)
 187                 if (sp->file->movebuf[k])
 188                         return 1;
 189         return 0;
 190 }
 191
 192 static bool
 193 isolated(struct ship *ship)
 194 {
 195         struct ship *sp;
 196
 197         foreachship(sp) {
 198                 if (ship != sp && range(ship, sp) <= 10)
 199                         return 0;
 200         }
 201         return 1;
 202 }
 203
 204 static bool
 205 push(struct ship *from, struct ship *to)
 206 {
 207         int bs, sb;
 208
 209         sb = to->specs->guns;
 210         bs = from->specs->guns;
 211         if (sb > bs)
 212                 return 1;
 213         if (sb < bs)
 214                 return 0;
 215         return from < to;
 216 }
 217
 218 static void
 219 step(char com, struct ship *sp, char *moved)
 220 {
 221         int dist;
 222
 223         switch (com) {
 224         case 'r':
 225                 if (++sp->file->dir == 9)
 226                         sp->file->dir = 1;
 227                 break;
 228         case 'l':
 229                 if (--sp->file->dir == 0)
 230                         sp->file->dir = 8;
 231                 break;
 232                 case '0': case '1': case '2': case '3':
 233                 case '4': case '5': case '6': case '7':
 234                 if (sp->file->dir % 2 == 0)
 235                         dist = dtab[com - '0'];
 236                 else
 237                         dist = com - '0';
 238                 sp->file->row -= dr[sp->file->dir] * dist;
 239                 sp->file->col -= dc[sp->file->dir] * dist;
 240                 *moved = 1;
 241                 break;
 242         case 'b':
 243                 break;
 244         case 'd':
 245                 if (!*moved) {
 246                         if (windspeed != 0 && ++sp->file->drift > 2 &&
 247                             ((sp->specs->class >= 3 && !snagged(sp))
 248                              || (turn & 1) == 0)) {
 249                                 sp->file->row -= dr[winddir];
 250                                 sp->file->col -= dc[winddir];
 251                         }
 252                 } else {
 253                         sp->file->drift = 0;
 254                 }
 255                 break;
 256         }
 257 }
 258
 259 void
 260 sendbp(struct ship *from, struct ship *to, int sections, char isdefense)
 261 {
 262         int n;
 263         struct BP *bp;
 264
 265         bp = isdefense ? from->file->DBP : from->file->OBP;
 266         for (n = 0; n < NBP && bp[n].turnsent; n++)
 267                 ;
 268         if (n < NBP && sections) {
 269                 Write(isdefense ? W_DBP : W_OBP, from,
 270                         n, turn, to->file->index, sections);
 271                 if (isdefense)
 272                         makesignal(from, "repelling boarders", NULL);
 273                 else
 274                         makesignal(from, "boarding the %s (%c%c)", to);
 275         }
 276 }
 277
 278 int
 279 toughmelee(struct ship *ship, struct ship *to, int isdefense, int count)
 280 {
 281         struct BP *bp;
 282         int obp = 0;
 283         int n, OBP = 0, DBP = 0, dbp = 0;
 284         int qual;
 285
 286         qual = ship->specs->qual;
 287         bp = isdefense ? ship->file->DBP : ship->file->OBP;
 288         for (n = 0; n < NBP; n++, bp++) {
 289                 if (bp->turnsent && (to == bp->toship || isdefense)) {
 290                         obp += bp->mensent / 100
 291                                 ? ship->specs->crew1 * qual : 0;
 292                         obp += (bp->mensent % 100)/10
 293                                 ? ship->specs->crew2 * qual : 0;
 294                         obp += bp->mensent % 10
 295                                 ? ship->specs->crew3 * qual : 0;
 296                 }
 297         }
 298         if (count || isdefense)
 299                 return obp;
 300         OBP = toughmelee(to, ship, 0, count + 1);
 301         dbp = toughmelee(ship, to, 1, count + 1);
 302         DBP = toughmelee(to, ship, 1, count + 1);
 303         if (OBP > obp + 10 || OBP + DBP >= obp + dbp + 10)
 304                 return 1;
 305         else
 306                 return 0;
 307 }
 308
 309 void
 310 reload(void)
 311 {
 312         struct ship *sp;
 313
 314         foreachship(sp) {
 315                 sp->file->loadwith = 0;
 316         }
 317 }
 318
 319 void
 320 checksails(void)
 321 {
 322         struct ship *sp;
 323         int rig, full;
 324         struct ship *closest;
 325
 326         foreachship(sp) {
 327                 if (sp->file->captain[0] != 0)
 328                         continue;
 329                 rig = sp->specs->rig1;
 330                 if (windspeed == 6 || (windspeed == 5 && sp->specs->class > 4))
 331                         rig = 0;
 332                 if (rig && sp->specs->crew3) {
 333                         closest = closestenemy(sp, 0, 0);
 334                         if (closest != 0) {
 335                                 if (range(sp, closest) > 9)
 336                                         full = 1;
 337                                 else
 338                                         full = 0;
 339                         } else
 340                                 full = 0;
 341                 } else
 342                         full = 0;
 343                 if ((sp->file->FS != 0) != full)
 344                         Write(W_FS, sp, full, 0, 0, 0);
 345         }
 346 }