games/sail/game.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  * @(#)game.c   8.1 (Berkeley) 5/31/93
  30  * $FreeBSD: src/games/sail/game.c,v 1.5 1999/11/30 03:49:33 billf Exp $
  31  * $DragonFly: src/games/sail/game.c,v 1.3 2006/09/03 17:33:13 pavalos Exp $
  32  */
  33
  34 #include "externs.h"
  35
  36 int
  37 maxturns(struct ship *ship, char *af)
  38 {
  39         int turns;
  40
  41         turns = ship->specs->ta;
  42         *af = (ship->file->drift > 1 && turns);
  43         if (*af != false) {
  44                 turns--;
  45                 if (ship->file->FS == 1)
  46                         turns = 0;
  47         }
  48         return turns;
  49 }
  50
  51 int
  52 maxmove(struct ship *ship, int dir, int fs)
  53 {
  54         int riggone = 0, Move, flank = 0;
  55
  56         Move = ship->specs->bs;
  57         if (!ship->specs->rig1)
  58                 riggone++;
  59         if (!ship->specs->rig2)
  60                 riggone++;
  61         if (!ship->specs->rig3)
  62                 riggone++;
  63         if (!ship->specs->rig4)
  64                 riggone++;
  65         if ((ship->file->FS || fs) && fs != -1) {
  66                 flank = 1;
  67                 Move = ship->specs->fs;
  68         }
  69         if (dir == winddir)
  70                 Move -= 1 + WET[windspeed][ship->specs->class-1].B;
  71         else if (dir == winddir + 2 || dir == winddir - 2 ||
  72                  dir == winddir - 6 || dir == winddir + 6)
  73                 Move -= 1 + WET[windspeed][ship->specs->class-1].C;
  74         else if (dir == winddir + 3 || dir == winddir - 3 ||
  75                  dir == winddir - 5 || dir == winddir + 5)
  76                 Move = (flank ? 2 : 1) - WET[windspeed][ship->specs->class-1].D;
  77         else if (dir == winddir + 4 || dir == winddir - 4)
  78                 Move = 0;
  79         else
  80                 Move -= WET[windspeed][ship->specs->class-1].A;
  81         Move -= riggone;
  82         Move = Move < 0 ? 0 : Move;
  83         return(Move);
  84 }