BSD 4_2 release

[unix-history] / usr / src / games / trek / shield.c

#ifndef lint
static char sccsid[] = "@(#)shield.c    4.2     (Berkeley)      5/27/83";
#endif not lint

# include       "trek.h"
# include       "getpar.h"

/*
**  SHIELD AND CLOAKING DEVICE CONTROL
**
**      'f' is one for auto shield up (in case of Condition RED),
**      zero for shield control, and negative one for cloaking
**      device control.
**
**      Called with an 'up' or 'down' on the same line, it puts
**      the shields/cloak into the specified mode.  Otherwise it
**      reports to the user the current mode, and asks if she wishes
**      to change.
**
**      This is not a free move.  Hits that occur as a result of
**      this move appear as though the shields are half up/down,
**      so you get partial hits.
*/

struct cvntab Udtab[] =
{
       "u",            "p",                    (int (*)())1,           0,
       "d",            "own",                  0,              0,
       0
};

shield(f)
int     f;
{
       register int            i;
       char                    c;
       struct cvntab           *r;
       char                    s[100];
       char                    *device, *dev2, *dev3;
       int                     ind;
       char                    *stat;

       if (f > 0 && (Ship.shldup || damaged(SRSCAN)))
               return;
       if (f < 0)
       {
               /* cloaking device */
               if (Ship.ship == QUEENE)
                       return (printf("Ye Faire Queene does not have the cloaking device.\n"));
               device = "Cloaking device";
               dev2 = "is";
               ind = CLOAK;
               dev3 = "it";
               stat = &Ship.cloaked;
       }
       else
       {
               /* shields */
               device = "Shields";
               dev2 = "are";
               dev3 = "them";
               ind = SHIELD;
               stat = &Ship.shldup;
       }
       if (damaged(ind))
       {
               if (f <= 0)
                       out(ind);
               return;
       }
       if (Ship.cond == DOCKED)
       {
               printf("%s %s down while docked\n", device, dev2);
               return;
       }
       if (f <= 0 && !testnl())
       {
               r = getcodpar("Up or down", Udtab);
               i = (int) r->value;
       }
       else
       {
               if (*stat)
                       sprintf(s, "%s %s up.  Do you want %s down", device, dev2, dev3);
               else
                       sprintf(s, "%s %s down.  Do you want %s up", device, dev2, dev3);
               if (!getynpar(s))
                       return;
               i = !*stat;
       }
       if (*stat == i)
       {
               printf("%s already ", device);
               if (i)
                       printf("up\n");
               else
                       printf("down\n");
               return;
       }
       if (i)
               if (f >= 0)
                       Ship.energy -= Param.shupengy;
               else
                       Ship.cloakgood = 0;
       Move.free = 0;
       if (f >= 0)
               Move.shldchg = 1;
       *stat = i;
       return;
}