sail/dr_2.c

   1 /*      $NetBSD: dr_2.c,v 1.19 2003/08/07 09:37:41 agc Exp $    */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)dr_2.c      8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: dr_2.c,v 1.19 2003/08/07 09:37:41 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include "extern.h"
  45 #include "driver.h"
  46
  47 #define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
  48
  49 static int      str_end(const char *);
  50 static int      score(struct ship *, struct ship *, char *, int);
  51 static void     move_ship(struct ship *, const char *, unsigned char *, short *, short *, char *);
  52 static void     try(struct ship *, struct ship *, char *, char *, int, int, int, int, int, int *, int);
  53 static void     rmend(char *);
  54
  55 const int dtab[] = {0,1,1,2,3,4,4,5};   /* diagonal distances in x==y */
  56
  57 void
  58 thinkofgrapples(void)
  59 {
  60         struct ship *sp, *sq;
  61         char friendly;
  62
  63         foreachship(sp) {
  64                 if (sp->file->captain[0] || sp->file->dir == 0)
  65                         continue;
  66                 foreachship(sq) {
  67                         friendly = sp->nationality == capship(sq)->nationality;
  68                         if (!friendly) {
  69                                 if (sp->file->struck || sp->file->captured != 0)
  70                                         continue;
  71                                 if (range(sp, sq) != 1)
  72                                         continue;
  73                                 if (grappled2(sp, sq))
  74                                         if (is_toughmelee(sp, sq, 0, 0))
  75                                                 ungrap(sp, sq);
  76                                         else
  77                                                 grap(sp, sq);
  78                                 else if (couldwin(sp, sq)) {
  79                                         grap(sp, sq);
  80                                         sp->file->loadwith = L_GRAPE;
  81                                 }
  82                         } else
  83                                 ungrap(sp, sq);
  84                 }
  85         }
  86 }
  87
  88 void
  89 checkup(void)
  90 {
  91         struct ship *sp, *sq;
  92         char explode, sink;
  93
  94         foreachship(sp) {
  95                 if (sp->file->dir == 0)
  96                         continue;
  97                 explode = sp->file->explode;
  98                 sink = sp->file->sink;
  99                 if (explode != 1 && sink != 1)
 100                         continue;
 101                 if (dieroll() < 5)
 102                         continue;
 103                 Write(sink == 1 ? W_SINK : W_EXPLODE, sp, 2, 0, 0, 0);
 104                 Write(W_DIR, sp, 0, 0, 0, 0);
 105                 if (snagged(sp))
 106                         foreachship(sq)
 107                                 cleansnag(sp, sq, 1);
 108                 if (sink != 1) {
 109                         makemsg(sp, "exploding!");
 110                         foreachship(sq) {
 111                                 if (sp != sq && sq->file->dir && range(sp, sq) < 4)
 112                                         table(sp, sq, RIGGING, L_EXPLODE, sp->specs->guns/13, 6);
 113                         }
 114                 } else
 115                         makemsg(sp, "sinking!");
 116         }
 117 }
 118
 119 void
 120 prizecheck(void)
 121 {
 122         struct ship *sp;
 123
 124         foreachship(sp) {
 125                 if (sp->file->captured == 0)
 126                         continue;
 127                 if (sp->file->struck || sp->file->dir == 0)
 128                         continue;
 129                 if (sp->specs->crew1 + sp->specs->crew2 + sp->specs->crew3 > sp->file->pcrew * 6) {
 130                         Writestr(W_SIGNAL, sp, "prize crew overthrown");
 131                         Write(W_POINTS, sp->file->captured, sp->file->captured->file->points - 2 * sp->specs->pts, 0, 0, 0);
 132                         Write(W_CAPTURED, sp, -1, 0, 0, 0);
 133                 }
 134         }
 135 }
 136
 137 static int
 138 str_end(const char *str)
 139 {
 140         const char *p;
 141
 142         for (p = str; *p; p++)
 143                 ;
 144         return p == str ? 0 : p[-1];
 145 }
 146
 147 void
 148 closeon(struct ship *from, struct ship *to, char *command, int ta, int ma, int af)
 149 {
 150         int high;
 151         char temp[10];
 152
 153         temp[0] = command[0] = '\0';
 154         high = -30000;
 155         try(from, to, command, temp, ma, ta, af, ma, from->file->dir, &high, 0);
 156 }
 157
 158 static int
 159 score(struct ship *ship, struct ship *to, char *movement, int onlytemp)
 160 {
 161         char drift;
 162         int row, col, dir, total, ran;
 163         struct File *fp = ship->file;
 164
 165         if ((dir = fp->dir) == 0)
 166                 return 0;
 167         row = fp->row;
 168         col = fp->col;
 169         drift = fp->drift;
 170         move_ship(ship, movement, &fp->dir, &fp->row, &fp->col, &drift);
 171         if (!*movement)
 172                 strcpy(movement, "d");
 173
 174         ran = range(ship, to);
 175         total = -50 * ran;
 176         if (ran < 4 && gunsbear(ship, to))
 177                 total += 60;
 178         if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4)
 179                 total = -30000;
 180
 181         if (!onlytemp) {
 182                 fp->row = row;
 183                 fp->col = col;
 184                 fp->dir = dir;
 185         }
 186         return total;
 187 }
 188
 189 static void
 190 move_ship(struct ship *ship, const char *p, unsigned char *dir, short *row, short *col, char *drift)
 191 {
 192         int dist;
 193         char moved = 0;
 194
 195         for (; *p; p++) {
 196                 switch (*p) {
 197                 case 'r':
 198                         if (++*dir == 9)
 199                                 *dir = 1;
 200                         break;
 201                 case 'l':
 202                         if (--*dir == 0)
 203                                 *dir = 8;
 204                         break;
 205                 case '1': case '2': case '3': case '4':
 206                 case '5': case '6': case '7':
 207                         moved++;
 208                         if (*dir % 2 == 0)
 209                                 dist = dtab[*p - '0'];
 210                         else
 211                                 dist = *p - '0';
 212                         *row -= dr[*dir] * dist;
 213                         *col -= dc[*dir] * dist;
 214                         break;
 215                 }
 216         }
 217         if (!moved) {
 218                 if (windspeed != 0 && ++*drift > 2) {
 219                         if ((ship->specs->class >= 3 && !snagged(ship))
 220                             || (turn & 1) == 0) {
 221                                 *row -= dr[winddir];
 222                                 *col -= dc[winddir];
 223                         }
 224                 }
 225         } else
 226                 *drift = 0;
 227 }
 228
 229 static void
 230 try(struct ship *f, struct ship *t, char *command, char *temp, int ma, int ta, int af, int vma, int dir, int *high, int rakeme)
 231 {
 232         int new, n;
 233         char st[4];
 234 #define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
 235
 236         if ((n = str_end(temp)) < '1' || n > '9')
 237                 for (n = 1; vma - n >= 0; n++) {
 238                         sprintf(st, "%d", n);
 239                         strcat(temp, st);
 240                         new = score(f, t, temp, rakeme);
 241                         if (new > *high && (!rakeme || rakeyou)) {
 242                                 *high = new;
 243                                 strcpy(command, temp);
 244                         }
 245                         try(f, t, command, temp, ma-n, ta, af, vma-n,
 246                                 dir, high, rakeme);
 247                         rmend(temp);
 248                 }
 249         if ((ma > 0 && ta > 0 && (n = str_end(temp)) != 'l' && n != 'r') || !strlen(temp)) {
 250                 strcat(temp, "r");
 251                 new = score(f, t, temp, rakeme);
 252                 if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))) {
 253                         *high = new;
 254                         strcpy(command, temp);
 255                 }
 256                 try(f, t, command, temp, ma-1, ta-1, af, min(ma-1, maxmove(f, (dir == 8 ? 1 : dir+1), 0)), (dir == 8 ? 1 : dir+1), high, rakeme);
 257                 rmend(temp);
 258         }
 259         if ((ma > 0 && ta > 0 && (n = str_end(temp)) != 'l' && n != 'r') || !strlen(temp)){
 260                 strcat(temp, "l");
 261                 new = score(f, t, temp, rakeme);
 262                 if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))){
 263                         *high = new;
 264                         strcpy(command, temp);
 265                 }
 266                 try(f, t, command, temp, ma-1, ta-1, af, (min(ma-1,maxmove(f, (dir-1 ? dir-1 : 8), 0))), (dir-1 ? dir -1 : 8), high, rakeme);
 267                 rmend(temp);
 268         }
 269 }
 270
 271 static void
 272 rmend(char *str)
 273 {
 274         char *p;
 275
 276         for (p = str; *p; p++)
 277                 ;
 278         if (p != str)
 279                 *--p = 0;
 280 }