games/trek/shield.c

   1 /*
   2  * Copyright (c) 1980, 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  * @(#)shield.c 8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/shield.c,v 1.5 1999/11/30 03:49:54 billf Exp $
  35  * $DragonFly: src/games/trek/shield.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  36  */
  37
  38 # include       "trek.h"
  39 # include       "getpar.h"
  40
  41 /*
  42 **  SHIELD AND CLOAKING DEVICE CONTROL
  43 **
  44 **      'f' is one for auto shield up (in case of Condition RED),
  45 **      zero for shield control, and negative one for cloaking
  46 **      device control.
  47 **
  48 **      Called with an 'up' or 'down' on the same line, it puts
  49 **      the shields/cloak into the specified mode.  Otherwise it
  50 **      reports to the user the current mode, and asks if she wishes
  51 **      to change.
  52 **
  53 **      This is not a free move.  Hits that occur as a result of
  54 **      this move appear as though the shields are half up/down,
  55 **      so you get partial hits.
  56 */
  57
  58 struct cvntab Udtab[] =
  59 {
  60         { "u",          "p",            (void (*)(int))1,       0 },
  61         { "d",          "own",          (void (*)(int))0,       0 },
  62         { NULL,         NULL,           NULL,                   0 }
  63 };
  64
  65 void
  66 shield(int f)
  67 {
  68         int             i;
  69         struct cvntab           *r;
  70         char                    s[100];
  71         const char              *device, *dev2, *dev3;
  72         int                     ind;
  73         char                    *stat;
  74
  75         if (f > 0 && (Ship.shldup || damaged(SRSCAN)))
  76                 return;
  77         if (f < 0)
  78         {
  79                 /* cloaking device */
  80                 if (Ship.ship == QUEENE) {
  81                         printf("Ye Faire Queene does not have the cloaking device.\n");
  82                         return;
  83                 }
  84                 device = "Cloaking device";
  85                 dev2 = "is";
  86                 ind = CLOAK;
  87                 dev3 = "it";
  88                 stat = &Ship.cloaked;
  89         }
  90         else
  91         {
  92                 /* shields */
  93                 device = "Shields";
  94                 dev2 = "are";
  95                 dev3 = "them";
  96                 ind = SHIELD;
  97                 stat = &Ship.shldup;
  98         }
  99         if (damaged(ind))
 100         {
 101                 if (f <= 0)
 102                         out(ind);
 103                 return;
 104         }
 105         if (Ship.cond == DOCKED)
 106         {
 107                 printf("%s %s down while docked\n", device, dev2);
 108                 return;
 109         }
 110         if (f <= 0 && !testnl())
 111         {
 112                 r = getcodpar("Up or down", Udtab);
 113                 i = (long) r->value;
 114         }
 115         else
 116         {
 117                 if (*stat)
 118                         sprintf(s, "%s %s up.  Do you want %s down", device, dev2, dev3);
 119                 else
 120                         sprintf(s, "%s %s down.  Do you want %s up", device, dev2, dev3);
 121                 if (!getynpar(s))
 122                         return;
 123                 i = !*stat;
 124         }
 125         if (*stat == i)
 126         {
 127                 printf("%s already ", device);
 128                 if (i)
 129                         printf("up\n");
 130                 else
 131                         printf("down\n");
 132                 return;
 133         }
 134         if (i)
 135         {
 136                 if (f >= 0)
 137                         Ship.energy -= Param.shupengy;
 138                 else
 139                         Ship.cloakgood = 0;
 140         }
 141         Move.free = 0;
 142         if (f >= 0)
 143                 Move.shldchg = 1;
 144         *stat = i;
 145         return;
 146 }