games/sail/dr_4.c

   1 /*      $NetBSD: dr_4.c,v 1.15 2009/03/14 22:52:52 dholland Exp $       */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)dr_4.c      8.2 (Berkeley) 4/28/95";
  36 #else
  37 __RCSID("$NetBSD: dr_4.c,v 1.15 2009/03/14 22:52:52 dholland Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdlib.h>
  42 #include "extern.h"
  43
  44 void
  45 ungrap(struct ship *from, struct ship *to)
  46 {
  47         int k;
  48         char friend;
  49
  50         if ((k = grappled2(from, to)) == 0)
  51                 return;
  52         friend = capship(from)->nationality == capship(to)->nationality;
  53         while (--k >= 0) {
  54                 if (friend || dieroll() < 3) {
  55                         cleangrapple(from, to, 0);
  56                         makesignal(from, "ungrappling $$", to);
  57                 }
  58         }
  59 }
  60
  61 void
  62 grap(struct ship *from, struct ship *to)
  63 {
  64         if (capship(from)->nationality != capship(to)->nationality &&
  65             dieroll() > 2)
  66                 return;
  67         send_grap(from, to->file->index);
  68         send_grap(to, from->file->index);
  69         makesignal(from, "grappled with $$", to);
  70 }