games/trek/shield.c

   1 /*      @(#)shield.c    8.1 (Berkeley) 5/31/93                          */
   2 /*      $NetBSD: shield.c,v 1.13 2009/08/12 08:54:54 dholland Exp $     */
   3
   4 /*
   5  * Copyright (c) 1980, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <stdio.h>
  34 #include "trek.h"
  35 #include "getpar.h"
  36
  37 /*
  38 **  SHIELD AND CLOAKING DEVICE CONTROL
  39 **
  40 **      'f' is one for auto shield up (in case of Condition RED),
  41 **      zero for shield control, and negative one for cloaking
  42 **      device control.
  43 **
  44 **      Called with an 'up' or 'down' on the same line, it puts
  45 **      the shields/cloak into the specified mode.  Otherwise it
  46 **      reports to the user the current mode, and asks if she wishes
  47 **      to change.
  48 **
  49 **      This is not a free move.  Hits that occur as a result of
  50 **      this move appear as though the shields are half up/down,
  51 **      so you get partial hits.
  52 */
  53
  54 static const struct cvntab Udtab[] = {
  55         { "u",          "p",            (cmdfun)1,      0 },
  56         { "d",          "own",          (cmdfun)0,      0 },
  57         { NULL,         NULL,           NULL,           0 }
  58 };
  59
  60 void
  61 shield(int f)
  62 {
  63         int             i;
  64         const struct cvntab     *r;
  65         char            s[100];
  66         const char      *device, *dev2, *dev3;
  67         int             ind;
  68         char            *stat;
  69
  70         if (f > 0 && (Ship.shldup || damaged(SRSCAN)))
  71                 return;
  72         if (f < 0) {
  73                 /* cloaking device */
  74                 if (Ship.ship == QUEENE) {
  75                         printf("Ye Faire Queene does not have the "
  76                                "cloaking device.\n");
  77                         return;
  78                 }
  79                 device = "Cloaking device";
  80                 dev2 = "is";
  81                 ind = CLOAK;
  82                 dev3 = "it";
  83                 stat = &Ship.cloaked;
  84         } else {
  85                 /* shields */
  86                 device = "Shields";
  87                 dev2 = "are";
  88                 dev3 = "them";
  89                 ind = SHIELD;
  90                 stat = &Ship.shldup;
  91         }
  92         if (damaged(ind)) {
  93                 if (f <= 0)
  94                         out(ind);
  95                 return;
  96         }
  97         if (Ship.cond == DOCKED) {
  98                 printf("%s %s down while docked\n", device, dev2);
  99                 return;
 100         }
 101         if (f <= 0 && !testnl()) {
 102                 r = getcodpar("Up or down", Udtab);
 103                 i = (long) r->value;
 104         } else {
 105                 if (*stat)
 106                         (void)snprintf(s, sizeof(s),
 107                                 "%s %s up.  Do you want %s down",
 108                                 device, dev2, dev3);
 109                 else
 110                         (void)snprintf(s, sizeof(s),
 111                                 "%s %s down.  Do you want %s up",
 112                                 device, dev2, dev3);
 113                 if (!getynpar(s))
 114                         return;
 115                 i = !*stat;
 116         }
 117         if (*stat == i) {
 118                 printf("%s already ", device);
 119                 if (i)
 120                         printf("up\n");
 121                 else
 122                         printf("down\n");
 123                 return;
 124         }
 125         if (i) {
 126                 if (f >= 0)
 127                         Ship.energy -= Param.shupengy;
 128                 else
 129                         Ship.cloakgood = 0;
 130         }
 131         Move.free = 0;
 132         if (f >= 0)
 133                 Move.shldchg = 1;
 134         *stat = i;
 135         return;
 136 }