games/sail/dr_2.c

   1 /*      $NetBSD: dr_2.c,v 1.27 2019/02/03 10:48:46 mrg 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 1.27 2019/02/03 10:48:46 mrg Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdbool.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include "extern.h"
  46 #include "driver.h"
  47
  48 #define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
  49
  50 static int str_end(const char *);
  51 static int score(struct ship *, struct ship *, char *, size_t, int);
  52 static void move_ship(struct ship *, const char *, unsigned char *,
  53                       short *, short *, int *);
  54 static void try(struct ship *f, struct ship *t,
  55                 char *command, size_t commandmax, char *temp, size_t tempmax,
  56                 int ma, int ta, bool af, int vma, int dir, int *high,
  57                 int rakeme);
  58 static void rmend(char *);
  59
  60 const int dtab[] = {0,1,1,2,3,4,4,5};   /* diagonal distances in x==y */
  61
  62 void
  63 thinkofgrapples(void)
  64 {
  65         struct ship *sp, *sq;
  66         bool friendly;
  67
  68         foreachship(sp) {
  69                 if (sp->file->captain[0] || sp->file->dir == 0)
  70                         continue;
  71                 foreachship(sq) {
  72                         friendly = sp->nationality == capship(sq)->nationality;
  73                         if (!friendly) {
  74                                 if (sp->file->struck || sp->file->captured != 0)
  75                                         continue;
  76                                 if (range(sp, sq) != 1)
  77                                         continue;
  78                                 if (grappled2(sp, sq)) {
  79                                         if (is_toughmelee(sp, sq, 0, 0))
  80                                                 ungrap(sp, sq);
  81                                         else
  82                                                 grap(sp, sq);
  83                                 } else if (couldwin(sp, sq)) {
  84                                         grap(sp, sq);
  85                                         sp->file->loadwith = L_GRAPE;
  86                                 }
  87                         } else
  88                                 ungrap(sp, sq);
  89                 }
  90         }
  91 }
  92
  93 void
  94 checkup(void)
  95 {
  96         struct ship *sp, *sq;
  97         char explode, sink;
  98
  99         foreachship(sp) {
 100                 if (sp->file->dir == 0)
 101                         continue;
 102                 explode = sp->file->explode;
 103                 sink = sp->file->sink;
 104                 if (explode != 1 && sink != 1)
 105                         continue;
 106                 if (dieroll() < 5)
 107                         continue;
 108                 if (sink == 1) {
 109                         send_sink(sp, 2);
 110                 } else {
 111                         send_explode(sp, 2);
 112                 }
 113                 send_dir(sp, 0);
 114                 if (snagged(sp))
 115                         foreachship(sq)
 116                                 cleansnag(sp, sq, 1);
 117                 if (sink != 1) {
 118                         makemsg(sp, "exploding!");
 119                         foreachship(sq) {
 120                                 if (sp != sq && sq->file->dir &&
 121                                     range(sp, sq) < 4)
 122                                         table(sp, sq, RIGGING, L_EXPLODE,
 123                                               sp->specs->guns/13, 6);
 124                         }
 125                 } else {
 126                         makemsg(sp, "sinking!");
 127                 }
 128         }
 129 }
 130
 131 void
 132 prizecheck(void)
 133 {
 134         struct ship *sp;
 135
 136         foreachship(sp) {
 137                 if (sp->file->captured == 0)
 138                         continue;
 139                 if (sp->file->struck || sp->file->dir == 0)
 140                         continue;
 141                 if (sp->specs->crew1 + sp->specs->crew2 + sp->specs->crew3 >
 142                     sp->file->pcrew * 6) {
 143                         send_signal(sp, "prize crew overthrown");
 144                         send_points(sp->file->captured,
 145                               sp->file->captured->file->points
 146                                 - 2 * sp->specs->pts);
 147                         send_captured(sp, -1);
 148                 }
 149         }
 150 }
 151
 152 static int
 153 str_end(const char *str)
 154 {
 155         const char *p;
 156
 157         for (p = str; *p; p++)
 158                 ;
 159         return p == str ? 0 : p[-1];
 160 }
 161
 162 void
 163 closeon(struct ship *from, struct ship *to, char *command, size_t commandmax,
 164         int ta, int ma, bool af)
 165 {
 166         int high;
 167         char temp[10];
 168
 169         temp[0] = command[0] = '\0';
 170         high = -30000;
 171         try(from, to, command, commandmax, temp, sizeof(temp),
 172             ma, ta, af, ma, from->file->dir, &high, 0);
 173 }
 174
 175 static int
 176 score(struct ship *ship, struct ship *to, char *movement, size_t movementmax,
 177       int onlytemp)
 178 {
 179         int drift;
 180         int row, col, dir, total, ran;
 181         struct File *fp = ship->file;
 182
 183         if ((dir = fp->dir) == 0)
 184                 return 0;
 185         row = fp->row;
 186         col = fp->col;
 187         drift = fp->drift;
 188         move_ship(ship, movement, &fp->dir, &fp->row, &fp->col, &drift);
 189         if (!*movement)
 190                 strlcpy(movement, "d", movementmax);
 191
 192         ran = range(ship, to);
 193         total = -50 * ran;
 194         if (ran < 4 && gunsbear(ship, to))
 195                 total += 60;
 196         if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4)
 197                 total = -30000;
 198
 199         if (!onlytemp) {
 200                 fp->row = row;
 201                 fp->col = col;
 202                 fp->dir = dir;
 203         }
 204         return total;
 205 }
 206
 207 static void
 208 move_ship(struct ship *ship, const char *p, unsigned char *dir,
 209           short *row, short *col, int *drift)
 210 {
 211         int dist;
 212         char moved = 0;
 213
 214         for (; *p; p++) {
 215                 switch (*p) {
 216                 case 'r':
 217                         if (++*dir == 9)
 218                                 *dir = 1;
 219                         break;
 220                 case 'l':
 221                         if (--*dir == 0)
 222                                 *dir = 8;
 223                         break;
 224                 case '1': case '2': case '3': case '4':
 225                 case '5': case '6': case '7':
 226                         moved++;
 227                         if (*dir % 2 == 0)
 228                                 dist = dtab[*p - '0'];
 229                         else
 230                                 dist = *p - '0';
 231                         *row -= dr[*dir] * dist;
 232                         *col -= dc[*dir] * dist;
 233                         break;
 234                 }
 235         }
 236         if (!moved) {
 237                 if (windspeed != 0 && ++*drift > 2) {
 238                         if ((ship->specs->class >= 3 && !snagged(ship))
 239                             || (turn & 1) == 0) {
 240                                 *row -= dr[winddir];
 241                                 *col -= dc[winddir];
 242                         }
 243                 }
 244         } else
 245                 *drift = 0;
 246 }
 247
 248 static void
 249 try(struct ship *f, struct ship *t,
 250     char *command, size_t commandmax,
 251     char *temp, size_t tempmax,
 252     int ma, int ta, bool af, int vma, int dir, int *high, int rakeme)
 253 {
 254         int new, n;
 255         char st[11];
 256 #define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
 257
 258         if ((n = str_end(temp)) < '1' || n > '9')
 259                 for (n = 1; vma - n >= 0; n++) {
 260                         snprintf(st, sizeof(st), "%d", n);
 261                         strlcat(temp, st, tempmax);
 262                         new = score(f, t, temp, tempmax, rakeme);
 263                         if (new > *high && (!rakeme || rakeyou)) {
 264                                 *high = new;
 265                                 strlcpy(command, temp, commandmax);
 266                         }
 267                         try(f, t, command, commandmax, temp, tempmax,
 268                             ma-n, ta, af, vma-n,
 269                             dir, high, rakeme);
 270                         rmend(temp);
 271                 }
 272         if ((ma > 0 && ta > 0 && (n = str_end(temp)) != 'l' && n != 'r') ||
 273             !strlen(temp)) {
 274                 strlcat(temp, "r", tempmax);
 275                 new = score(f, t, temp, tempmax, rakeme);
 276                 if (new > *high && (!rakeme ||
 277                                     (gunsbear(f, t) && !gunsbear(t, f)))) {
 278                         *high = new;
 279                         strlcpy(command, temp, commandmax);
 280                 }
 281                 try(f, t, command, commandmax, temp, tempmax,
 282                     ma-1, ta-1, af,
 283                     min(ma-1, maxmove(f, (dir == 8 ? 1 : dir+1), 0)),
 284                     (dir == 8 ? 1 : dir+1), high, rakeme);
 285                 rmend(temp);
 286         }
 287         if ((ma > 0 && ta > 0 && (n = str_end(temp)) != 'l' && n != 'r') ||
 288             !strlen(temp)) {
 289                 strlcat(temp, "l", tempmax);
 290                 new = score(f, t, temp, tempmax, rakeme);
 291                 if (new > *high && (!rakeme ||
 292                                     (gunsbear(f, t) && !gunsbear(t, f)))) {
 293                         *high = new;
 294                         strlcpy(command, temp, commandmax);
 295                 }
 296                 try(f, t, command, commandmax, temp, tempmax,
 297                     ma-1, ta-1, af,
 298                     (min(ma-1,maxmove(f, (dir-1 ? dir-1 : 8), 0))),
 299                     (dir-1 ? dir -1 : 8), high, rakeme);
 300                 rmend(temp);
 301         }
 302 }
 303
 304 static void
 305 rmend(char *str)
 306 {
 307         char *p;
 308
 309         for (p = str; *p; p++)
 310                 ;
 311         if (p != str)
 312                 *--p = 0;
 313 }