server/server/move.c

/*
 * static char *rcsid_move_c =
 *    "$Id: move.c,v 1.1.1.1 2006/02/03 07:14:33 root 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

extern int same_party (partylist *a, partylist *b);

/*
 * 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 = newx + tmp->arch->clone.x;
        tmp->y = newy + tmp->arch->clone.y;
        tmp->map = m;
    }

    /* 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;
    }

    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 && owner->contr && pusher->contr 
           && same_party (owner->contr->party, pusher->contr->party))
          || 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:	1.2
Committed:	Fri Feb 3 07:25:25 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+11 -2 lines
Log Message:	initial cfperl/cf.schmorp.de import
#	User	Rev	Content
1	root	1.1	/*
2			* static char *rcsid_move_c =
3	root	1.2	* "$Id: move.c,v 1.1.1.1 2006/02/03 07:14:33 root 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	root	1.2	extern int same_party (partylist a, partylist b);
35
36	root	1.1	/*
37			* move_object() tries to move object op in the direction "dir".
38			* If it fails (something blocks the passage), it returns 0,
39			* otherwise 1.
40			* This is an improvement from the previous move_ob(), which
41			* removed and inserted objects even if they were unable to move.
42			*/
43
44			int move_object(object *op, int dir) {
45			return move_ob(op, dir, op);
46			}
47
48
49			/* object op is trying to move in direction dir.
50			* originator is typically the same as op, but
51			* can be different if originator is causing op to
52			* move (originator is pushing op)
53			* returns 0 if the object is not able to move to the
54			* desired space, 1 otherwise (in which case we also
55			* move the object accordingly. This function is
56			* very similiar to move_object.
57			*/
58			int move_ob (object op, int dir, object originator)
59			{
60			sint16 newx = op->x+freearr_x[dir];
61			sint16 newy = op->y+freearr_y[dir];
62			object *tmp;
63			mapstruct *m;
64			int mflags;
65
66			if(op==NULL) {
67			LOG(llevError,"Trying to move NULL.\n");
68			return 0;
69			}
70
71			m = op->map;
72			mflags = get_map_flags(m, &m, newx, newy, &newx, &newy);
73
74			/* If the space the player is trying to is out of the map,
75			* bail now - we know it can't work.
76			*/
77			if (mflags & P_OUT_OF_MAP) return 0;
78
79
80			/* Is this space blocked? Players with wizpass are immune to
81			* this condition.
82			*/
83			if(blocked_link(op, m, newx, newy) &&
84			!QUERY_FLAG(op, FLAG_WIZPASS))
85			return 0;
86
87			/* 0.94.2 - we need to set the direction for the new animation code.
88			* it uses it to figure out face to use - I can't see it
89			* breaking anything, but it might.
90			*/
91			if(op->more != NULL && !move_ob(op->more, dir, op->more->head))
92			return 0;
93
94			op->direction = dir;
95
96			if(op->will_apply&4)
97			check_earthwalls(op,m, newx,newy);
98			if(op->will_apply&8)
99			check_doors(op,m, newx,newy);
100
101			/* 0.94.1 - I got a stack trace that showed it crash with remove_ob trying
102			* to remove a removed object, and this function was the culprit. A possible
103			* guess I have is that check_doors above ran into a trap, killing the
104			* monster.
105			*
106			* Unfortunately, it doesn't appear that the calling functions of move_object
107			* deal very well with op being killed, so all this might do is just
108			* migrate the problem someplace else.
109			*/
110
111			if (QUERY_FLAG(op, FLAG_REMOVED)) {
112			LOG(llevDebug,"move_object: monster has been removed - will not process further\n");
113			/* Was not successful, but don't want to try and move again */
114			return 1;
115			}
116
117			/* If this is a tail portion, just want to tell caller that move is
118			* ok - the caller will deal with actual object removal/insertion
119			*/
120			if(op->head)
121			return 1;
122
123			remove_ob(op);
124
125			/* we already have newx, newy, and m, so lets use them.
126			* In addition, this fixes potential crashes, because multipart object was
127			* on edge of map, +=x, +=y doesn't make correct coordinates.
128			*/
129			for(tmp = op; tmp != NULL; tmp = tmp->more) {
130			tmp->x = newx + tmp->arch->clone.x;
131			tmp->y = newy + tmp->arch->clone.y;
132			tmp->map = m;
133			}
134
135			/* insert_ob_in_map will deal with any tiling issues */
136			insert_ob_in_map(op, m, originator,0);
137
138			/* Hmmm. Should be possible for multispace players now */
139			if (op->type==PLAYER) {
140			esrv_map_scroll(&op->contr->socket, freearr_x[dir],freearr_y[dir]);
141			op->contr->socket.update_look=1;
142			op->contr->socket.look_position=0;
143			}
144
145			return 1; /* this shouldn't be reached */
146			}
147
148
149			/*
150			* transfer_ob(): Move an object (even linked objects) to another spot
151			* on the same map.
152			*
153			* Does nothing if there is no free spot.
154			*
155			* randomly: If true, use find_free_spot() to find the destination, otherwise
156			* use find_first_free_spot().
157			*
158			* Return value: 1 if object was destroyed, 0 otherwise.
159			*/
160
161			int transfer_ob (object op, int x, int y, int randomly, object originator)
162			{
163			int i;
164			object *tmp;
165
166			if (randomly)
167			i = find_free_spot (op,op->map,x,y,0,SIZEOFFREE);
168			else
169			i = find_first_free_spot(op,op->map,x,y);
170
171			if (i==-1)
172			return 0; /* No free spot */
173
174			if(op->head!=NULL)
175			op=op->head;
176			remove_ob(op);
177			for(tmp=op;tmp!=NULL;tmp=tmp->more)
178			tmp->x=x+freearr_x[i]+(tmp->arch==NULL?0:tmp->arch->clone.x),
179			tmp->y=y+freearr_y[i]+(tmp->arch==NULL?0:tmp->arch->clone.y);
180
181			tmp = insert_ob_in_map(op,op->map,originator,0);
182			if (op && op->type == PLAYER) MapNewmapCmd(op->contr);
183			if (tmp) return 0;
184			else return 1;
185			}
186
187			/*
188			* Return value: 1 if object was destroyed, 0 otherwise.
189			* Modified so that instead of passing the 'originator' that had no
190			* real use, instead we pass the 'user' of the teleporter. All the
191			* callers know what they wanted to teleporter (move_teleporter or
192			* shop map code)
193			* tele_type is the type of teleporter we want to match against -
194			* currently, this is either set to SHOP_MAT or TELEPORTER.
195			* It is basically used so that shop_mats and normal teleporters can
196			* be used close to each other and not have the player put to the
197			* one of another type.
198			*/
199			int teleport (object teleporter, uint8 tele_type, object user)
200			{
201			object altern[120]; / Better use c/malloc here in the future */
202			int i,j,k,nrofalt=0;
203			object other_teleporter, tmp;
204			mapstruct *m;
205			sint16 sx, sy;
206
207			if(user==NULL) return 0;
208			if(user->head!=NULL)
209			user=user->head;
210
211			/* Find all other teleporters within range. This range
212			* should really be setable by some object attribute instead of
213			* using hard coded values.
214			*/
215			for(i= -5;i<6;i++)
216			for(j= -5;j<6;j++) {
217			if(i==0&&j==0)
218			continue;
219			/* Perhaps this should be extended to support tiled maps */
220			if(OUT_OF_REAL_MAP(teleporter->map,teleporter->x+i,teleporter->y+j))
221			continue;
222			other_teleporter=get_map_ob(teleporter->map,
223			teleporter->x+i,teleporter->y+j);
224
225			while (other_teleporter) {
226			if (other_teleporter->type == tele_type) break;
227			other_teleporter = other_teleporter->above;
228			}
229			if (other_teleporter)
230			altern[nrofalt++]=other_teleporter;
231			}
232
233			if(!nrofalt) {
234			LOG(llevError,"No alternative teleporters around!\n");
235			return 0;
236			}
237
238			other_teleporter=altern[RANDOM()%nrofalt];
239			k=find_free_spot(user,other_teleporter->map,
240			other_teleporter->x,other_teleporter->y,1,9);
241
242			/* if k==-1, unable to find a free spot. If this is shop
243			* mat that the player is using, find someplace to move
244			* the player - otherwise, player can get trapped in the shops
245			* that appear in random dungeons. We basically just make
246			* sure the space isn't no pass (eg wall), and don't care
247			* about is alive.
248			*/
249			if (k==-1) {
250			if (tele_type == SHOP_MAT && user->type == PLAYER) {
251			for (k=1; k<9; k++) {
252			if (get_map_flags(other_teleporter->map, &m,
253			other_teleporter->x + freearr_x[k],
254			other_teleporter->y + freearr_y[k], &sx,&sy) &
255			P_OUT_OF_MAP) continue;
256
257			if (!OB_TYPE_MOVE_BLOCK(user, GET_MAP_MOVE_BLOCK(m, sx, sy))) break;
258
259			}
260			if (k==9) {
261			LOG(llevError,"Shop mat %s (%d, %d) is in solid rock?\n",
262			other_teleporter->name, other_teleporter->x, other_teleporter->y);
263			return 0;
264			}
265			}
266			else return 0;
267			}
268
269			remove_ob(user);
270
271			/* Update location for the object */
272			for(tmp=user;tmp!=NULL;tmp=tmp->more) {
273			tmp->x=other_teleporter->x+freearr_x[k]+
274			(tmp->arch==NULL?0:tmp->arch->clone.x);
275			tmp->y=other_teleporter->y+freearr_y[k]+
276			(tmp->arch==NULL?0:tmp->arch->clone.y);
277			}
278			tmp = insert_ob_in_map(user,other_teleporter->map,NULL,0);
279			if (tmp && tmp->type == PLAYER) MapNewmapCmd(tmp->contr);
280			return (tmp == NULL);
281			}
282
283			void recursive_roll(object op,int dir,object pusher) {
284			if(!roll_ob(op,dir,pusher)) {
285			new_draw_info_format(NDI_UNIQUE, 0, pusher,
286			"You fail to push the %s.",query_name(op));
287			return;
288			}
289			(void) move_ob(pusher,dir,pusher);
290			new_draw_info_format(NDI_BLACK, 0, pusher,
291			"You move the %s.",query_name(op));
292			return;
293			}
294
295			/*
296			* This is a new version of blocked, this one handles objects
297			* that can be passed through by monsters with the CAN_PASS_THRU defined.
298			*
299			* very new version handles also multipart objects
300			* This is currently only used for the boulder roll code.
301			* Returns 1 if object does not fit, 0 if it does.
302			*/
303
304			int try_fit (object op, mapstruct m, int x, int y)
305			{
306			object tmp, more;
307			sint16 tx, ty;
308			int mflags;
309			mapstruct *m2;
310
311			if (op->head)
312			op = op->head;
313
314			for (more = op; more ; more = more->more) {
315			tx = x + more->x - op->x;
316			ty = y + more->y - op->y;
317
318			mflags = get_map_flags(m, &m2, tx, ty, &tx, &ty);
319
320			if (mflags & P_OUT_OF_MAP)
321			return 1;
322
323			for (tmp = get_map_ob (m2, tx, ty); tmp; tmp=tmp->above) {
324			if (tmp->head == op \|\| tmp == op)
325			continue;
326
327			if ((QUERY_FLAG(tmp,FLAG_ALIVE) && tmp->type!=DOOR))
328			return 1;
329
330			if (OB_MOVE_BLOCK(op, tmp)) return 1;
331
332			}
333			}
334			return 0;
335			}
336
337			/*
338			* this is not perfect yet.
339			* it does not roll objects behind multipart objects properly.
340			* Support for rolling multipart objects is questionable.
341			*/
342
343			int roll_ob(object op,int dir, object pusher) {
344			object *tmp;
345			sint16 x, y;
346			int flags;
347			mapstruct *m;
348			MoveType move_block;
349
350			if (op->head)
351			op = op->head;
352
353			x=op->x+freearr_x[dir];
354			y=op->y+freearr_y[dir];
355
356			if(!QUERY_FLAG(op,FLAG_CAN_ROLL) \|\|
357			(op->weight &&
358			random_roll(0, op->weight/50000-1, pusher, PREFER_LOW) > pusher->stats.Str))
359			return 0;
360
361			m = op->map;
362			flags = get_map_flags(m, &m, x, y, &x, &y);
363
364			if (flags & (P_OUT_OF_MAP \| P_IS_ALIVE))
365			return 0;
366
367			move_block = GET_MAP_MOVE_BLOCK(m, x, y);
368
369			/* If the target space is not blocked, no need to look at the objects on it */
370			if ((op->move_type & move_block) == op->move_type) {
371			for (tmp=get_map_ob(m, x, y); tmp!=NULL; tmp=tmp->above) {
372			if (tmp->head == op)
373			continue;
374			if (OB_MOVE_BLOCK(op, tmp) && !roll_ob(tmp,dir,pusher))
375			return 0;
376			}
377			}
378			if (try_fit (op, m, x, y))
379			return 0;
380
381			remove_ob(op);
382			for(tmp=op; tmp!=NULL; tmp=tmp->more)
383			tmp->x+=freearr_x[dir],tmp->y+=freearr_y[dir];
384			insert_ob_in_map(op,op->map,pusher,0);
385			return 1;
386			}
387
388			/* returns 1 if pushing invokes a attack, 0 when not */
389			int push_ob(object who, int dir, object pusher) {
390			int str1, str2;
391			object *owner;
392
393			if (who->head != NULL)
394			who = who->head;
395			owner = get_owner(who);
396
397			/* Wake up sleeping monsters that may be pushed */
398			CLEAR_FLAG(who,FLAG_SLEEP);
399
400			/* player change place with his pets or summoned creature */
401			/* TODO: allow multi arch pushing. Can't be very difficult */
402	root	1.2	if (who->more == NULL
403			&&
404			(
405			(owner && owner->contr && pusher->contr
406			&& same_party (owner->contr->party, pusher->contr->party))
407			\|\| owner == pusher
408			)
409			) {
410	root	1.1	int temp;
411			mapstruct *m;
412
413			remove_ob(who);
414			remove_ob(pusher);
415			temp = pusher->x;
416			pusher->x = who->x;
417			who->x = temp;
418
419			temp = pusher->y;
420			pusher->y = who->y;
421			who->y = temp;
422
423			m = pusher->map;
424			pusher->map = who->map;
425			who->map = m;
426
427			insert_ob_in_map (who,who->map,pusher,0);
428			insert_ob_in_map (pusher,pusher->map,pusher,0);
429
430			/* we presume that if the player is pushing his put, he moved in
431			* direction 'dir'. I can' think of any case where this would not be
432			* the case. Putting the map_scroll should also improve performance some.
433			*/
434			if (pusher->type == PLAYER ) {
435			esrv_map_scroll(&pusher->contr->socket, freearr_x[dir],freearr_y[dir]);
436			pusher->contr->socket.update_look=1;
437			pusher->contr->socket.look_position=0;
438			}
439			return 0;
440			}
441
442
443			/* We want ONLY become enemy of evil, unaggressive monster. We must RUN in them */
444			/* In original we have here a unaggressive check only - that was the reason why */
445			/* we so often become an enemy of friendly monsters... */
446			/* funny: was they set to unaggressive 0 (= not so nice) they don't attack */
447
448			if(owner != pusher && pusher->type == PLAYER && who->type != PLAYER &&
449			!QUERY_FLAG(who,FLAG_FRIENDLY)&& !QUERY_FLAG(who,FLAG_NEUTRAL)) {
450			if(pusher->contr->run_on) /* only when we run */ {
451			new_draw_info_format(NDI_UNIQUE, 0, pusher,
452			"You start to attack %s !!",who->name);
453			CLEAR_FLAG(who,FLAG_UNAGGRESSIVE); /* the sucker don't like you anymore */
454			who->enemy = pusher;
455			return 1;
456			}
457			else
458			{
459			new_draw_info_format(NDI_UNIQUE, 0, pusher,
460			"You avoid attacking %s .",who->name);
461			}
462			}
463
464			/* now, lets test stand still. we NEVER can push stand_still monsters. */
465			if(QUERY_FLAG(who,FLAG_STAND_STILL))
466			{
467			new_draw_info_format(NDI_UNIQUE, 0, pusher,
468			"You can't push %s.",who->name);
469			return 0;
470			}
471
472			/* This block is basically if you are pushing friendly but
473			* non pet creaturs.
474			* It basically does a random strength comparision to
475			* determine if you can push someone around. Note that
476			* this pushes the other person away - its not a swap.
477			*/
478
479			str1 = (who->stats.Str>0?who->stats.Str:who->level);
480			str2 = (pusher->stats.Str>0?pusher->stats.Str:pusher->level);
481			if(QUERY_FLAG(who,FLAG_WIZ) \|\|
482			random_roll(str1, str1/2+str1*2, who, PREFER_HIGH) >=
483			random_roll(str2, str2/2+str2*2, pusher, PREFER_HIGH) \|\|
484			!move_object(who,dir))
485			{
486			if (who ->type == PLAYER) {
487			new_draw_info_format(NDI_UNIQUE, 0, who,
488			"%s tried to push you.",pusher->name);
489			}
490			return 0;
491			}
492
493			/* If we get here, the push succeeded.
494			* Let everyone know the status.
495			*/
496			if (who->type == PLAYER) {
497			new_draw_info_format(NDI_UNIQUE, 0, who,
498			"%s pushed you.",pusher->name);
499			}
500			if (pusher->type == PLAYER) {
501			new_draw_info_format(NDI_UNIQUE, 0, pusher,
502			"You pushed %s back.", who->name);
503			}
504
505			return 1;
506			}