server/server/move.c

/*
 * static char *rcsid_move_c =
 *    "$Id: move.c,v 1.39 2006/02/07 07:54:46 mwedel Exp $";
 */

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to crossfire-devel@real-time.com
*/

#include <global.h>
#ifndef __CEXTRACT__
#include <sproto.h>
#endif

/*
 * move_object() tries to move object op in the direction "dir".
 * If it fails (something blocks the passage), it returns 0,
 * otherwise 1.
 * This is an improvement from the previous move_ob(), which
 * removed and inserted objects even if they were unable to move.
 */

int move_object(object *op, int dir) {
    return move_ob(op, dir, op);
}


/* object op is trying to move in direction dir.
 * originator is typically the same as op, but
 * can be different if originator is causing op to
 * move (originator is pushing op)
 * returns 0 if the object is not able to move to the
 * desired space, 1 otherwise (in which case we also 
 * move the object accordingly.  This function is
 * very similiar to move_object.
  */
int move_ob (object *op, int dir, object *originator)
{
    sint16 newx = op->x+freearr_x[dir];
    sint16 newy = op->y+freearr_y[dir];
    object *tmp;
    mapstruct *m;
    int mflags;

    if(op==NULL) {
        LOG(llevError,"Trying to move NULL.\n");
        return 0;
    }

    m = op->map;
    mflags = get_map_flags(m, &m, newx, newy, &newx, &newy);

    /* If the space the player is trying to is out of the map,
     * bail now - we know it can't work.
     */
    if (mflags & P_OUT_OF_MAP) return 0;


    /* Is this space blocked?  Players with wizpass are immune to
     * this condition.
     */
    if(blocked_link(op, m, newx, newy) &&
       !QUERY_FLAG(op, FLAG_WIZPASS))
        return 0;

    /* 0.94.2 - we need to set the direction for the new animation code.
     * it uses it to figure out face to use - I can't see it
     * breaking anything, but it might.
     */
    if(op->more != NULL && !move_ob(op->more, dir, op->more->head))
        return 0;

    op->direction = dir;

    if(op->will_apply&4)
        check_earthwalls(op,m, newx,newy);
    if(op->will_apply&8)
        check_doors(op,m, newx,newy);

    /* 0.94.1 - I got a stack trace that showed it crash with remove_ob trying
     * to remove a removed object, and this function was the culprit.  A possible
     * guess I have is that check_doors above ran into a trap, killing the
     * monster.
     *
     * Unfortunately, it doesn't appear that the calling functions of move_object
     * deal very well with op being killed, so all this might do is just
     * migrate the problem someplace else.
     */

    if (QUERY_FLAG(op, FLAG_REMOVED)) {
        LOG(llevDebug,"move_object: monster has been removed - will not process further\n");
        /* Was not successful, but don't want to try and move again */
        return 1;
    }

    /* If this is a tail portion, just want to tell caller that move is
     * ok - the caller will deal with actual object removal/insertion
     */
    if(op->head)
        return 1;

    remove_ob(op);

    /* we already have newx, newy, and m, so lets use them.
     * In addition, this fixes potential crashes, because multipart object was
     * on edge of map, +=x, +=y doesn't make correct coordinates.
     */
    for(tmp = op; tmp != NULL; tmp = tmp->more) {
        tmp->x += freearr_x[dir];
        tmp->y += freearr_y[dir];
        tmp->map =  get_map_from_coord(tmp->map, &tmp->x, &tmp->y);
    }

    /* insert_ob_in_map will deal with any tiling issues */
    insert_ob_in_map(op, m, originator,0);

    /* Hmmm.  Should be possible for multispace players now */
    if (op->type==PLAYER) {
        esrv_map_scroll(&op->contr->socket, freearr_x[dir],freearr_y[dir]);
        op->contr->socket.update_look=1;
        op->contr->socket.look_position=0;
    }
    else if (op->type == TRANSPORT) {
        object *pl;

        for (pl=op->inv; pl; pl=pl->below) {
            if (pl->type == PLAYER) {
                pl->contr->do_los=1;
                pl->map = op->map;
                pl->x = op->x;
                pl->y = op->y;
                esrv_map_scroll(&pl->contr->socket, freearr_x[dir],freearr_y[dir]);
                pl->contr->socket.update_look=1;
                pl->contr->socket.look_position=0;
            }
        }
    }

    return 1;   /* this shouldn't be reached */
}


/*
 * transfer_ob(): Move an object (even linked objects) to another spot
 * on the same map.
 *
 * Does nothing if there is no free spot.
 *
 * randomly: If true, use find_free_spot() to find the destination, otherwise
 * use find_first_free_spot().
 *
 * Return value: 1 if object was destroyed, 0 otherwise.
 */

int transfer_ob (object *op, int x, int y, int randomly, object *originator)
{
    int i;
    object *tmp;

    if (randomly)
        i = find_free_spot (op,op->map,x,y,0,SIZEOFFREE);
    else
        i = find_first_free_spot(op,op->map,x,y);

    if (i==-1)
        return 0;       /* No free spot */

    if(op->head!=NULL)
        op=op->head;
    remove_ob(op);
    for(tmp=op;tmp!=NULL;tmp=tmp->more)
        tmp->x=x+freearr_x[i]+(tmp->arch==NULL?0:tmp->arch->clone.x),
        tmp->y=y+freearr_y[i]+(tmp->arch==NULL?0:tmp->arch->clone.y);

    tmp = insert_ob_in_map(op,op->map,originator,0);
    if (op && op->type == PLAYER) MapNewmapCmd(op->contr);
    if (tmp) return 0;
    else return 1;
}

/*
 * Return value: 1 if object was destroyed, 0 otherwise.
 * Modified so that instead of passing the 'originator' that had no
 * real use, instead we pass the 'user' of the teleporter.  All the
 * callers know what they wanted to teleporter (move_teleporter or
 * shop map code)
 * tele_type is the type of teleporter we want to match against -
 * currently, this is either set to SHOP_MAT or TELEPORTER.
 * It is basically used so that shop_mats and normal teleporters can
 * be used close to each other and not have the player put to the
 * one of another type.
 */
int teleport (object *teleporter, uint8 tele_type, object *user)
{
    object *altern[120]; /* Better use c/malloc here in the future */
    int i,j,k,nrofalt=0;
    object *other_teleporter, *tmp;
    mapstruct *m;
    sint16  sx, sy;

    if(user==NULL) return 0;
    if(user->head!=NULL)
        user=user->head;

    /* Find all other teleporters within range.  This range
     * should really be setable by some object attribute instead of
     * using hard coded values.
     */
    for(i= -5;i<6;i++)
        for(j= -5;j<6;j++) {
            if(i==0&&j==0)
                continue;
            /* Perhaps this should be extended to support tiled maps */
            if(OUT_OF_REAL_MAP(teleporter->map,teleporter->x+i,teleporter->y+j))
                continue;
            other_teleporter=get_map_ob(teleporter->map,
                                  teleporter->x+i,teleporter->y+j);

            while (other_teleporter) {
                if (other_teleporter->type == tele_type) break;
                other_teleporter = other_teleporter->above;
            }
            if (other_teleporter)
                altern[nrofalt++]=other_teleporter;
        }

    if(!nrofalt) {
        LOG(llevError,"No alternative teleporters around!\n");
        return 0;
    }

    other_teleporter=altern[RANDOM()%nrofalt];
    k=find_free_spot(user,other_teleporter->map,
                        other_teleporter->x,other_teleporter->y,1,9);

    /* if k==-1, unable to find a free spot.  If this is shop
     * mat that the player is using, find someplace to move
     * the player - otherwise, player can get trapped in the shops
     * that appear in random dungeons.  We basically just make
     * sure the space isn't no pass (eg wall), and don't care
     * about is alive.
     */
    if (k==-1) {
        if (tele_type == SHOP_MAT && user->type == PLAYER) {
            for (k=1; k<9; k++) {
                if (get_map_flags(other_teleporter->map, &m, 
                        other_teleporter->x + freearr_x[k],
                        other_teleporter->y + freearr_y[k], &sx,&sy) &
                        P_OUT_OF_MAP) continue;

                if (!OB_TYPE_MOVE_BLOCK(user, GET_MAP_MOVE_BLOCK(m, sx, sy))) break;

            }
            if (k==9) {
                LOG(llevError,"Shop mat %s (%d, %d) is in solid rock?\n",
                    other_teleporter->name, other_teleporter->x, other_teleporter->y);
                return 0;
            }
        }
        else return 0;
    }

    remove_ob(user);

    /* Update location for the object */
    for(tmp=user;tmp!=NULL;tmp=tmp->more) {
        tmp->x=other_teleporter->x+freearr_x[k]+
           (tmp->arch==NULL?0:tmp->arch->clone.x);
        tmp->y=other_teleporter->y+freearr_y[k]+
           (tmp->arch==NULL?0:tmp->arch->clone.y);
    }
    tmp = insert_ob_in_map(user,other_teleporter->map,NULL,0);
    if (tmp && tmp->type == PLAYER) MapNewmapCmd(tmp->contr);
    return (tmp == NULL);
}

void recursive_roll(object *op,int dir,object *pusher) {
  if(!roll_ob(op,dir,pusher)) {
    new_draw_info_format(NDI_UNIQUE, 0, pusher,
        "You fail to push the %s.",query_name(op));
    return;
  }
  (void) move_ob(pusher,dir,pusher);
  new_draw_info_format(NDI_BLACK, 0, pusher,
        "You move the %s.",query_name(op));
  return;
}

/*
 * This is a new version of blocked, this one handles objects
 * that can be passed through by monsters with the CAN_PASS_THRU defined.
 *
 * very new version handles also multipart objects
 * This is currently only used for the boulder roll code.
 * Returns 1 if object does not fit, 0 if it does.
 */

int try_fit (object *op, mapstruct *m, int x, int y) 
{
    object *tmp, *more;
    sint16 tx, ty;
    int mflags;
    mapstruct *m2;

    if (op->head) 
        op = op->head;

    for (more = op; more ; more = more->more) {
        tx = x + more->x - op->x;
        ty = y + more->y - op->y;

        mflags = get_map_flags(m, &m2, tx, ty, &tx, &ty);

        if (mflags & P_OUT_OF_MAP)
            return 1;

        for (tmp = get_map_ob (m2, tx, ty); tmp; tmp=tmp->above) {
            if (tmp->head == op || tmp == op)
                continue;

            if ((QUERY_FLAG(tmp,FLAG_ALIVE) && tmp->type!=DOOR))
                return 1;

            if (OB_MOVE_BLOCK(op, tmp)) return 1;

        }
    }
    return 0;
}

/*
 * this is not perfect yet. 
 * it does not roll objects behind multipart objects properly.
 * Support for rolling multipart objects is questionable.
 */

int roll_ob(object *op,int dir, object *pusher) {
    object *tmp;
    sint16 x, y;
    int flags;
    mapstruct *m;
    MoveType    move_block;

    if (op->head) 
        op = op->head;

    x=op->x+freearr_x[dir];
    y=op->y+freearr_y[dir];

    if(!QUERY_FLAG(op,FLAG_CAN_ROLL) || 
       (op->weight &&
       random_roll(0, op->weight/50000-1, pusher, PREFER_LOW) > pusher->stats.Str))
        return 0;

    m = op->map;
    flags = get_map_flags(m, &m, x, y, &x, &y);

    if (flags & (P_OUT_OF_MAP | P_IS_ALIVE))
        return 0;

    move_block = GET_MAP_MOVE_BLOCK(m, x, y);

    /* If the target space is not blocked, no need to look at the objects on it */
    if ((op->move_type & move_block) == op->move_type) {
        for (tmp=get_map_ob(m, x, y); tmp!=NULL; tmp=tmp->above) {
        if (tmp->head == op)
            continue;
        if (OB_MOVE_BLOCK(op, tmp) && !roll_ob(tmp,dir,pusher))
            return 0;
        }
    }
    if (try_fit (op, m, x, y))
        return 0;

    remove_ob(op);
    for(tmp=op; tmp!=NULL; tmp=tmp->more)
        tmp->x+=freearr_x[dir],tmp->y+=freearr_y[dir];
    insert_ob_in_map(op,op->map,pusher,0);
    return 1;
}

/* returns 1 if pushing invokes a attack, 0 when not */
int push_ob(object *who, int dir, object *pusher) {
    int str1, str2;
    object *owner;

    if (who->head != NULL)
        who = who->head;
    owner = get_owner(who);

    /* Wake up sleeping monsters that may be pushed */
    CLEAR_FLAG(who,FLAG_SLEEP);
  
    /* player change place with his pets or summoned creature */
    /* TODO: allow multi arch pushing. Can't be very difficult */
    if (who->more == NULL && owner == pusher) {
        int temp;
        mapstruct *m;

        remove_ob(who);
        remove_ob(pusher);
        temp = pusher->x;
        pusher->x = who->x;
        who->x = temp;

        temp = pusher->y;
        pusher->y = who->y;
        who->y = temp;

        m = pusher->map;
        pusher->map = who->map;
        who->map = m;

        insert_ob_in_map (who,who->map,pusher,0);
        insert_ob_in_map (pusher,pusher->map,pusher,0);

        /* we presume that if the player is pushing his put, he moved in
         * direction 'dir'.  I can' think of any case where this would not be
         * the case.  Putting the map_scroll should also improve performance some.
         */
        if (pusher->type == PLAYER ) {
            esrv_map_scroll(&pusher->contr->socket, freearr_x[dir],freearr_y[dir]);
            pusher->contr->socket.update_look=1;
            pusher->contr->socket.look_position=0;
        }
        return 0;
    }


    /* We want ONLY become enemy of evil, unaggressive monster. We must RUN in them */
    /* In original we have here a unaggressive check only - that was the reason why */
    /* we so often become an enemy of friendly monsters... */
    /* funny: was they set to unaggressive 0 (= not so nice) they don't attack */

    if(owner != pusher &&  pusher->type == PLAYER && who->type != PLAYER &&
      !QUERY_FLAG(who,FLAG_FRIENDLY)&& !QUERY_FLAG(who,FLAG_NEUTRAL)) {
        if(pusher->contr->run_on) /* only when we run */ {
            new_draw_info_format(NDI_UNIQUE, 0, pusher,
              "You start to attack %s !!",who->name);
            CLEAR_FLAG(who,FLAG_UNAGGRESSIVE); /* the sucker don't like you anymore */
            who->enemy = pusher;
            return 1;
        }
        else 
        {
            new_draw_info_format(NDI_UNIQUE, 0, pusher,
                                 "You avoid attacking %s .",who->name);
        }
    }

    /* now, lets test stand still. we NEVER can push stand_still monsters. */
    if(QUERY_FLAG(who,FLAG_STAND_STILL))
    {
        new_draw_info_format(NDI_UNIQUE, 0, pusher,
          "You can't push %s.",who->name);
        return 0;
    }
  
    /* This block is basically if you are pushing friendly but
     * non pet creaturs.
     * It basically does a random strength comparision to
     * determine if you can push someone around.  Note that
     * this pushes the other person away - its not a swap.
     */

    str1 = (who->stats.Str>0?who->stats.Str:who->level);
    str2 = (pusher->stats.Str>0?pusher->stats.Str:pusher->level);
    if(QUERY_FLAG(who,FLAG_WIZ) ||
       random_roll(str1, str1/2+str1*2, who, PREFER_HIGH) >= 
       random_roll(str2, str2/2+str2*2, pusher, PREFER_HIGH) ||
       !move_object(who,dir))
    {
        if (who ->type == PLAYER) {
            new_draw_info_format(NDI_UNIQUE, 0, who,
                 "%s tried to push you.",pusher->name);
        }
        return 0;
    }

    /* If we get here, the push succeeded.
     * Let everyone know the status.
     */
    if (who->type == PLAYER) {
        new_draw_info_format(NDI_UNIQUE, 0, who,
                             "%s pushed you.",pusher->name);
    }
    if (pusher->type == PLAYER) {
        new_draw_info_format(NDI_UNIQUE, 0, pusher,
                "You pushed %s back.", who->name);
    }
  
    return 1;
}
Revision:	1.1.1.2 (vendor branch)
Committed:	Wed Feb 22 18:03:22 2006 UTC (18 years, 3 months ago) by elmex
Content type:	text/plain
Branch:	UPSTREAM
CVS Tags:	UPSTREAM_2006_03_15, UPSTREAM_2006_02_22
Changes since 1.1.1.1:	+19 -4 lines
Log Message:	cvs -z7 -d:ext:elmex@cvs.schmorp.de:/schmorpforge import cf.schmorp.de UPSTREAM UPSTREAM_2006_02_22
#	User	Rev	Content
1	root	1.1	/*
2			* static char *rcsid_move_c =
3	elmex	1.1.1.2	* "$Id: move.c,v 1.39 2006/02/07 07:54:46 mwedel Exp $";
4	root	1.1	*/
5
6			/*
7			CrossFire, A Multiplayer game for X-windows
8
9			Copyright (C) 2002 Mark Wedel & Crossfire Development Team
10			Copyright (C) 1992 Frank Tore Johansen
11
12			This program is free software; you can redistribute it and/or modify
13			it under the terms of the GNU General Public License as published by
14			the Free Software Foundation; either version 2 of the License, or
15			(at your option) any later version.
16
17			This program is distributed in the hope that it will be useful,
18			but WITHOUT ANY WARRANTY; without even the implied warranty of
19			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20			GNU General Public License for more details.
21
22			You should have received a copy of the GNU General Public License
23			along with this program; if not, write to the Free Software
24			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26			The author can be reached via e-mail to crossfire-devel@real-time.com
27			*/
28
29			#include <global.h>
30			#ifndef __CEXTRACT__
31			#include <sproto.h>
32			#endif
33
34			/*
35			* move_object() tries to move object op in the direction "dir".
36			* If it fails (something blocks the passage), it returns 0,
37			* otherwise 1.
38			* This is an improvement from the previous move_ob(), which
39			* removed and inserted objects even if they were unable to move.
40			*/
41
42			int move_object(object *op, int dir) {
43			return move_ob(op, dir, op);
44			}
45
46
47			/* object op is trying to move in direction dir.
48			* originator is typically the same as op, but
49			* can be different if originator is causing op to
50			* move (originator is pushing op)
51			* returns 0 if the object is not able to move to the
52			* desired space, 1 otherwise (in which case we also
53			* move the object accordingly. This function is
54			* very similiar to move_object.
55			*/
56			int move_ob (object op, int dir, object originator)
57			{
58			sint16 newx = op->x+freearr_x[dir];
59			sint16 newy = op->y+freearr_y[dir];
60			object *tmp;
61			mapstruct *m;
62			int mflags;
63
64			if(op==NULL) {
65			LOG(llevError,"Trying to move NULL.\n");
66			return 0;
67			}
68
69			m = op->map;
70			mflags = get_map_flags(m, &m, newx, newy, &newx, &newy);
71
72			/* If the space the player is trying to is out of the map,
73			* bail now - we know it can't work.
74			*/
75			if (mflags & P_OUT_OF_MAP) return 0;
76
77
78			/* Is this space blocked? Players with wizpass are immune to
79			* this condition.
80			*/
81			if(blocked_link(op, m, newx, newy) &&
82			!QUERY_FLAG(op, FLAG_WIZPASS))
83			return 0;
84
85			/* 0.94.2 - we need to set the direction for the new animation code.
86			* it uses it to figure out face to use - I can't see it
87			* breaking anything, but it might.
88			*/
89			if(op->more != NULL && !move_ob(op->more, dir, op->more->head))
90			return 0;
91
92			op->direction = dir;
93
94			if(op->will_apply&4)
95			check_earthwalls(op,m, newx,newy);
96			if(op->will_apply&8)
97			check_doors(op,m, newx,newy);
98
99			/* 0.94.1 - I got a stack trace that showed it crash with remove_ob trying
100			* to remove a removed object, and this function was the culprit. A possible
101			* guess I have is that check_doors above ran into a trap, killing the
102			* monster.
103			*
104			* Unfortunately, it doesn't appear that the calling functions of move_object
105			* deal very well with op being killed, so all this might do is just
106			* migrate the problem someplace else.
107			*/
108
109			if (QUERY_FLAG(op, FLAG_REMOVED)) {
110			LOG(llevDebug,"move_object: monster has been removed - will not process further\n");
111			/* Was not successful, but don't want to try and move again */
112			return 1;
113			}
114
115			/* If this is a tail portion, just want to tell caller that move is
116			* ok - the caller will deal with actual object removal/insertion
117			*/
118			if(op->head)
119			return 1;
120
121			remove_ob(op);
122
123			/* we already have newx, newy, and m, so lets use them.
124			* In addition, this fixes potential crashes, because multipart object was
125			* on edge of map, +=x, +=y doesn't make correct coordinates.
126			*/
127			for(tmp = op; tmp != NULL; tmp = tmp->more) {
128	elmex	1.1.1.2	tmp->x += freearr_x[dir];
129			tmp->y += freearr_y[dir];
130			tmp->map = get_map_from_coord(tmp->map, &tmp->x, &tmp->y);
131	root	1.1	}
132
133			/* insert_ob_in_map will deal with any tiling issues */
134			insert_ob_in_map(op, m, originator,0);
135
136			/* Hmmm. Should be possible for multispace players now */
137			if (op->type==PLAYER) {
138			esrv_map_scroll(&op->contr->socket, freearr_x[dir],freearr_y[dir]);
139			op->contr->socket.update_look=1;
140			op->contr->socket.look_position=0;
141			}
142	elmex	1.1.1.2	else if (op->type == TRANSPORT) {
143			object *pl;
144
145			for (pl=op->inv; pl; pl=pl->below) {
146			if (pl->type == PLAYER) {
147			pl->contr->do_los=1;
148			pl->map = op->map;
149			pl->x = op->x;
150			pl->y = op->y;
151			esrv_map_scroll(&pl->contr->socket, freearr_x[dir],freearr_y[dir]);
152			pl->contr->socket.update_look=1;
153			pl->contr->socket.look_position=0;
154			}
155			}
156			}
157	root	1.1
158			return 1; /* this shouldn't be reached */
159			}
160
161
162			/*
163			* transfer_ob(): Move an object (even linked objects) to another spot
164			* on the same map.
165			*
166			* Does nothing if there is no free spot.
167			*
168			* randomly: If true, use find_free_spot() to find the destination, otherwise
169			* use find_first_free_spot().
170			*
171			* Return value: 1 if object was destroyed, 0 otherwise.
172			*/
173
174			int transfer_ob (object op, int x, int y, int randomly, object originator)
175			{
176			int i;
177			object *tmp;
178
179			if (randomly)
180			i = find_free_spot (op,op->map,x,y,0,SIZEOFFREE);
181			else
182			i = find_first_free_spot(op,op->map,x,y);
183
184			if (i==-1)
185			return 0; /* No free spot */
186
187			if(op->head!=NULL)
188			op=op->head;
189			remove_ob(op);
190			for(tmp=op;tmp!=NULL;tmp=tmp->more)
191			tmp->x=x+freearr_x[i]+(tmp->arch==NULL?0:tmp->arch->clone.x),
192			tmp->y=y+freearr_y[i]+(tmp->arch==NULL?0:tmp->arch->clone.y);
193
194			tmp = insert_ob_in_map(op,op->map,originator,0);
195			if (op && op->type == PLAYER) MapNewmapCmd(op->contr);
196			if (tmp) return 0;
197			else return 1;
198			}
199
200			/*
201			* Return value: 1 if object was destroyed, 0 otherwise.
202			* Modified so that instead of passing the 'originator' that had no
203			* real use, instead we pass the 'user' of the teleporter. All the
204			* callers know what they wanted to teleporter (move_teleporter or
205			* shop map code)
206			* tele_type is the type of teleporter we want to match against -
207			* currently, this is either set to SHOP_MAT or TELEPORTER.
208			* It is basically used so that shop_mats and normal teleporters can
209			* be used close to each other and not have the player put to the
210			* one of another type.
211			*/
212			int teleport (object teleporter, uint8 tele_type, object user)
213			{
214			object altern[120]; / Better use c/malloc here in the future */
215			int i,j,k,nrofalt=0;
216			object other_teleporter, tmp;
217			mapstruct *m;
218			sint16 sx, sy;
219
220			if(user==NULL) return 0;
221			if(user->head!=NULL)
222			user=user->head;
223
224			/* Find all other teleporters within range. This range
225			* should really be setable by some object attribute instead of
226			* using hard coded values.
227			*/
228			for(i= -5;i<6;i++)
229			for(j= -5;j<6;j++) {
230			if(i==0&&j==0)
231			continue;
232			/* Perhaps this should be extended to support tiled maps */
233			if(OUT_OF_REAL_MAP(teleporter->map,teleporter->x+i,teleporter->y+j))
234			continue;
235			other_teleporter=get_map_ob(teleporter->map,
236			teleporter->x+i,teleporter->y+j);
237
238			while (other_teleporter) {
239			if (other_teleporter->type == tele_type) break;
240			other_teleporter = other_teleporter->above;
241			}
242			if (other_teleporter)
243			altern[nrofalt++]=other_teleporter;
244			}
245
246			if(!nrofalt) {
247			LOG(llevError,"No alternative teleporters around!\n");
248			return 0;
249			}
250
251			other_teleporter=altern[RANDOM()%nrofalt];
252			k=find_free_spot(user,other_teleporter->map,
253			other_teleporter->x,other_teleporter->y,1,9);
254
255			/* if k==-1, unable to find a free spot. If this is shop
256			* mat that the player is using, find someplace to move
257			* the player - otherwise, player can get trapped in the shops
258			* that appear in random dungeons. We basically just make
259			* sure the space isn't no pass (eg wall), and don't care
260			* about is alive.
261			*/
262			if (k==-1) {
263			if (tele_type == SHOP_MAT && user->type == PLAYER) {
264			for (k=1; k<9; k++) {
265			if (get_map_flags(other_teleporter->map, &m,
266			other_teleporter->x + freearr_x[k],
267			other_teleporter->y + freearr_y[k], &sx,&sy) &
268			P_OUT_OF_MAP) continue;
269
270			if (!OB_TYPE_MOVE_BLOCK(user, GET_MAP_MOVE_BLOCK(m, sx, sy))) break;
271
272			}
273			if (k==9) {
274			LOG(llevError,"Shop mat %s (%d, %d) is in solid rock?\n",
275			other_teleporter->name, other_teleporter->x, other_teleporter->y);
276			return 0;
277			}
278			}
279			else return 0;
280			}
281
282			remove_ob(user);
283
284			/* Update location for the object */
285			for(tmp=user;tmp!=NULL;tmp=tmp->more) {
286			tmp->x=other_teleporter->x+freearr_x[k]+
287			(tmp->arch==NULL?0:tmp->arch->clone.x);
288			tmp->y=other_teleporter->y+freearr_y[k]+
289			(tmp->arch==NULL?0:tmp->arch->clone.y);
290			}
291			tmp = insert_ob_in_map(user,other_teleporter->map,NULL,0);
292			if (tmp && tmp->type == PLAYER) MapNewmapCmd(tmp->contr);
293			return (tmp == NULL);
294			}
295
296			void recursive_roll(object op,int dir,object pusher) {
297			if(!roll_ob(op,dir,pusher)) {
298			new_draw_info_format(NDI_UNIQUE, 0, pusher,
299			"You fail to push the %s.",query_name(op));
300			return;
301			}
302			(void) move_ob(pusher,dir,pusher);
303			new_draw_info_format(NDI_BLACK, 0, pusher,
304			"You move the %s.",query_name(op));
305			return;
306			}
307
308			/*
309			* This is a new version of blocked, this one handles objects
310			* that can be passed through by monsters with the CAN_PASS_THRU defined.
311			*
312			* very new version handles also multipart objects
313			* This is currently only used for the boulder roll code.
314			* Returns 1 if object does not fit, 0 if it does.
315			*/
316
317			int try_fit (object op, mapstruct m, int x, int y)
318			{
319			object tmp, more;
320			sint16 tx, ty;
321			int mflags;
322			mapstruct *m2;
323
324			if (op->head)
325			op = op->head;
326
327			for (more = op; more ; more = more->more) {
328			tx = x + more->x - op->x;
329			ty = y + more->y - op->y;
330
331			mflags = get_map_flags(m, &m2, tx, ty, &tx, &ty);
332
333			if (mflags & P_OUT_OF_MAP)
334			return 1;
335
336			for (tmp = get_map_ob (m2, tx, ty); tmp; tmp=tmp->above) {
337			if (tmp->head == op \|\| tmp == op)
338			continue;
339
340			if ((QUERY_FLAG(tmp,FLAG_ALIVE) && tmp->type!=DOOR))
341			return 1;
342
343			if (OB_MOVE_BLOCK(op, tmp)) return 1;
344
345			}
346			}
347			return 0;
348			}
349
350			/*
351			* this is not perfect yet.
352			* it does not roll objects behind multipart objects properly.
353			* Support for rolling multipart objects is questionable.
354			*/
355
356			int roll_ob(object op,int dir, object pusher) {
357			object *tmp;
358			sint16 x, y;
359			int flags;
360			mapstruct *m;
361			MoveType move_block;
362
363			if (op->head)
364			op = op->head;
365
366			x=op->x+freearr_x[dir];
367			y=op->y+freearr_y[dir];
368
369			if(!QUERY_FLAG(op,FLAG_CAN_ROLL) \|\|
370			(op->weight &&
371			random_roll(0, op->weight/50000-1, pusher, PREFER_LOW) > pusher->stats.Str))
372			return 0;
373
374			m = op->map;
375			flags = get_map_flags(m, &m, x, y, &x, &y);
376
377			if (flags & (P_OUT_OF_MAP \| P_IS_ALIVE))
378			return 0;
379
380			move_block = GET_MAP_MOVE_BLOCK(m, x, y);
381
382			/* If the target space is not blocked, no need to look at the objects on it */
383			if ((op->move_type & move_block) == op->move_type) {
384			for (tmp=get_map_ob(m, x, y); tmp!=NULL; tmp=tmp->above) {
385			if (tmp->head == op)
386			continue;
387			if (OB_MOVE_BLOCK(op, tmp) && !roll_ob(tmp,dir,pusher))
388			return 0;
389			}
390			}
391			if (try_fit (op, m, x, y))
392			return 0;
393
394			remove_ob(op);
395			for(tmp=op; tmp!=NULL; tmp=tmp->more)
396			tmp->x+=freearr_x[dir],tmp->y+=freearr_y[dir];
397			insert_ob_in_map(op,op->map,pusher,0);
398			return 1;
399			}
400
401			/* returns 1 if pushing invokes a attack, 0 when not */
402			int push_ob(object who, int dir, object pusher) {
403			int str1, str2;
404			object *owner;
405
406			if (who->head != NULL)
407			who = who->head;
408			owner = get_owner(who);
409
410			/* Wake up sleeping monsters that may be pushed */
411			CLEAR_FLAG(who,FLAG_SLEEP);
412
413			/* player change place with his pets or summoned creature */
414			/* TODO: allow multi arch pushing. Can't be very difficult */
415			if (who->more == NULL && owner == pusher) {
416			int temp;
417			mapstruct *m;
418
419			remove_ob(who);
420			remove_ob(pusher);
421			temp = pusher->x;
422			pusher->x = who->x;
423			who->x = temp;
424
425			temp = pusher->y;
426			pusher->y = who->y;
427			who->y = temp;
428
429			m = pusher->map;
430			pusher->map = who->map;
431			who->map = m;
432
433			insert_ob_in_map (who,who->map,pusher,0);
434			insert_ob_in_map (pusher,pusher->map,pusher,0);
435
436			/* we presume that if the player is pushing his put, he moved in
437			* direction 'dir'. I can' think of any case where this would not be
438			* the case. Putting the map_scroll should also improve performance some.
439			*/
440			if (pusher->type == PLAYER ) {
441			esrv_map_scroll(&pusher->contr->socket, freearr_x[dir],freearr_y[dir]);
442			pusher->contr->socket.update_look=1;
443			pusher->contr->socket.look_position=0;
444			}
445			return 0;
446			}
447
448
449			/* We want ONLY become enemy of evil, unaggressive monster. We must RUN in them */
450			/* In original we have here a unaggressive check only - that was the reason why */
451			/* we so often become an enemy of friendly monsters... */
452			/* funny: was they set to unaggressive 0 (= not so nice) they don't attack */
453
454			if(owner != pusher && pusher->type == PLAYER && who->type != PLAYER &&
455			!QUERY_FLAG(who,FLAG_FRIENDLY)&& !QUERY_FLAG(who,FLAG_NEUTRAL)) {
456			if(pusher->contr->run_on) /* only when we run */ {
457			new_draw_info_format(NDI_UNIQUE, 0, pusher,
458			"You start to attack %s !!",who->name);
459			CLEAR_FLAG(who,FLAG_UNAGGRESSIVE); /* the sucker don't like you anymore */
460			who->enemy = pusher;
461			return 1;
462			}
463			else
464			{
465			new_draw_info_format(NDI_UNIQUE, 0, pusher,
466			"You avoid attacking %s .",who->name);
467			}
468			}
469
470			/* now, lets test stand still. we NEVER can push stand_still monsters. */
471			if(QUERY_FLAG(who,FLAG_STAND_STILL))
472			{
473			new_draw_info_format(NDI_UNIQUE, 0, pusher,
474			"You can't push %s.",who->name);
475			return 0;
476			}
477
478			/* This block is basically if you are pushing friendly but
479			* non pet creaturs.
480			* It basically does a random strength comparision to
481			* determine if you can push someone around. Note that
482			* this pushes the other person away - its not a swap.
483			*/
484
485			str1 = (who->stats.Str>0?who->stats.Str:who->level);
486			str2 = (pusher->stats.Str>0?pusher->stats.Str:pusher->level);
487			if(QUERY_FLAG(who,FLAG_WIZ) \|\|
488			random_roll(str1, str1/2+str1*2, who, PREFER_HIGH) >=
489			random_roll(str2, str2/2+str2*2, pusher, PREFER_HIGH) \|\|
490			!move_object(who,dir))
491			{
492			if (who ->type == PLAYER) {
493			new_draw_info_format(NDI_UNIQUE, 0, who,
494			"%s tried to push you.",pusher->name);
495			}
496			return 0;
497			}
498
499			/* If we get here, the push succeeded.
500			* Let everyone know the status.
501			*/
502			if (who->type == PLAYER) {
503			new_draw_info_format(NDI_UNIQUE, 0, who,
504			"%s pushed you.",pusher->name);
505			}
506			if (pusher->type == PLAYER) {
507			new_draw_info_format(NDI_UNIQUE, 0, pusher,
508			"You pushed %s back.", who->name);
509			}
510
511			return 1;
512			}