/*
 * Knock code
 *
 *  Written by John Patrick (j.s.patrick@ieee.org)
 *   for Ansalon (ansalonmud.com 8679)
 *
 * I'm very big in intellectual property rights.  In order to use
 * this code or any derivatives in your MUD, you must do the following:
 *
 *  - E-mail me at j.s.patrick@ieee.org
 *  - Have a helpfile for the item that includes a credit to me, with
 *    the above e-mail address in it.  (E.g. This code was written by
 *    John Patrick (j.s.patrick@ieee.org) and used with permission.)
 *
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "merc.h"
#include "recycle.h"

/* Extern calls.  */
extern int  find_door       args( ( CHAR_DATA *ch, char *arg ) );


/**************************************************************************/

/*
 *  This function allows a character to knock on a door.
*/

void
do_knock(CHAR_DATA *ch, char *argument)
{
  /* Constructs taken from do_open().  */
  int door;
  char arg[MAX_INPUT_LENGTH];

  one_argument(argument,arg);

  if (arg[0] == '\0')
    {
      send_to_char("Knock on what?\n\r",ch);
      return;
    }

  if ( ( door = find_door( ch, arg ) ) >= 0 )
    {
      ROOM_INDEX_DATA *to_room;
      EXIT_DATA *pexit;
      EXIT_DATA *pexit_rev;

      pexit = ch->in_room->exit[door];

      act( "$n knocks on the $d.", ch, NULL, pexit->keyword, TO_ROOM);
      act( "You knock on the $d.", ch, NULL, pexit->keyword, TO_CHAR);

      /* Notify the other side.  */
      if (   ( to_room   = pexit->u1.to_room            ) != NULL
          && ( pexit_rev = to_room->exit[rev_dir[door]] ) != NULL
          && pexit_rev->u1.to_room == ch->in_room )
        {
          CHAR_DATA *rch;
          for ( rch = to_room->people; rch != NULL; rch = rch->next_in_room )
            act( "You hear someone knocking.", rch, NULL, pexit_rev->keyword, TO_CHAR);
        }
    }

  return;
}