sail/dr_2.c

   1 /*
   2  * Copyright (c) 1983 Regents of the University of California.
   3  * 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
  34 #ifndef lint
  35 /*static char sccsid[] = "from: @(#)dr_2.c      5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: dr_2.c,v 1.2 1993/08/01 18:51:51 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 #include "driver.h"
  40
  41 #define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
  42
  43 thinkofgrapples()
  44 {
  45         register 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         register struct ship *sp, *sq;
  76         register 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         register 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         register 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 register 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 register struct ship *ship, *to;
 149 char onlytemp;
 150 {
 151         char drift;
 152         int row, col, dir, total, ran;
 153         register 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         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 move(p, ship, dir, row, col, drift)
 180 register char *p;
 181 register struct ship *ship;
 182 register char *dir;
 183 register short *row, *col;
 184 register 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 register struct ship *f, *t;
 225 int ma, ta, af, *high, rakeme;
 226 char command[], temp[];
 227 {
 228         register 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         register char *p;
 271
 272         for (p = str; *p; p++)
 273                 ;
 274         if (p != str)
 275                 *--p = 0;
 276 }