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. 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  * @(#)game.c   8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/sail/game.c,v 1.5 1999/11/30 03:49:33 billf Exp $
  35  * $DragonFly: src/games/sail/game.c,v 1.3 2006/09/03 17:33:13 pavalos Exp $
  36  */
  37
  38 #include "externs.h"
  39
  40 int
  41 maxturns(struct ship *ship, char *af)
  42 {
  43         int turns;
  44
  45         turns = ship->specs->ta;
  46         if ((*af = (ship->file->drift > 1 && turns))) {
  47                 turns--;
  48                 if (ship->file->FS == 1)
  49                         turns = 0;
  50         }
  51         return turns;
  52 }
  53
  54 int
  55 maxmove(struct ship *ship, int dir, int fs)
  56 {
  57         int riggone = 0, Move, flank = 0;
  58
  59         Move = ship->specs->bs;
  60         if (!ship->specs->rig1)
  61                 riggone++;
  62         if (!ship->specs->rig2)
  63                 riggone++;
  64         if (!ship->specs->rig3)
  65                 riggone++;
  66         if (!ship->specs->rig4)
  67                 riggone++;
  68         if ((ship->file->FS || fs) && fs != -1) {
  69                 flank = 1;
  70                 Move = ship->specs->fs;
  71         }
  72         if (dir == winddir)
  73                 Move -= 1 + WET[windspeed][ship->specs->class-1].B;
  74         else if (dir == winddir + 2 || dir == winddir - 2 || dir == winddir - 6 || dir == winddir + 6)
  75                 Move -= 1 + WET[windspeed][ship->specs->class-1].C;
  76         else if (dir == winddir + 3 || dir == winddir - 3 || dir == winddir - 5 || dir == winddir + 5)
  77                 Move = (flank ? 2 : 1) - WET[windspeed][ship->specs->class-1].D;
  78         else if (dir == winddir + 4 || dir == winddir - 4)
  79                 Move = 0;
  80         else
  81                 Move -= WET[windspeed][ship->specs->class-1].A;
  82         Move -= riggone;
  83         Move = Move < 0 ? 0 : Move;
  84         return(Move);
  85 }