sail/dr_4.c

   1 /*      $NetBSD: dr_4.c,v 1.12 2001/02/05 01:10:09 christos 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)dr_4.c      8.2 (Berkeley) 4/28/95";
  40 #else
  41 __RCSID("$NetBSD: dr_4.c,v 1.12 2001/02/05 01:10:09 christos Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <stdlib.h>
  46 #include "extern.h"
  47
  48 void
  49 ungrap(struct ship *from, struct ship *to)
  50 {
  51         int k;
  52         char friend;
  53
  54         if ((k = grappled2(from, to)) == 0)
  55                 return;
  56         friend = capship(from)->nationality == capship(to)->nationality;
  57         while (--k >= 0) {
  58                 if (friend || dieroll() < 3) {
  59                         cleangrapple(from, to, 0);
  60                         makesignal(from, "ungrappling $$", to);
  61                 }
  62         }
  63 }
  64
  65 void
  66 grap(struct ship *from, struct ship *to)
  67 {
  68         if (capship(from)->nationality != capship(to)->nationality && dieroll() > 2)
  69                 return;
  70         Write(W_GRAP, from, to->file->index, 0, 0, 0);
  71         Write(W_GRAP, to, from->file->index, 0, 0, 0);
  72         makesignal(from, "grappled with $$", to);
  73 }