server/server/move.c

/*
 * static char *rcsid_move_c =
 *    "$Id: move.c,v 1.2 2006/02/03 07:25:25 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

#ifdef COZY_SERVER
// use a ptotoype
extern int same_party (partylist *a, partylist *b);
#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 = 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 
#ifdef COZY_SERVER
        &&
        (
          (owner && owner->contr && pusher->contr 
           && same_party (owner->contr->party, pusher->contr->party))
          || owner == pusher
        )
#else
        && owner == pusher
#endif
        ) {
        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:	1.3
Committed:	Thu Feb 9 02:11:26 2006 UTC (18 years, 3 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+8 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* static char *rcsid_move_c =
3	* "$Id: move.c,v 1.2 2006/02/03 07:25:25 root Exp $";
4	*/
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	#ifdef COZY_SERVER
35	// use a ptotoype
36	extern int same_party (partylist a, partylist b);
37	#endif
38
39	/*
40	* move_object() tries to move object op in the direction "dir".
41	* If it fails (something blocks the passage), it returns 0,
42	* otherwise 1.
43	* This is an improvement from the previous move_ob(), which
44	* removed and inserted objects even if they were unable to move.
45	*/
46
47	int move_object(object *op, int dir) {
48	return move_ob(op, dir, op);
49	}
50
51
52	/* object op is trying to move in direction dir.
53	* originator is typically the same as op, but
54	* can be different if originator is causing op to
55	* move (originator is pushing op)
56	* returns 0 if the object is not able to move to the
57	* desired space, 1 otherwise (in which case we also
58	* move the object accordingly. This function is
59	* very similiar to move_object.
60	*/
61	int move_ob (object op, int dir, object originator)
62	{
63	sint16 newx = op->x+freearr_x[dir];
64	sint16 newy = op->y+freearr_y[dir];
65	object *tmp;
66	mapstruct *m;
67	int mflags;
68
69	if(op==NULL) {
70	LOG(llevError,"Trying to move NULL.\n");
71	return 0;
72	}
73
74	m = op->map;
75	mflags = get_map_flags(m, &m, newx, newy, &newx, &newy);
76
77	/* If the space the player is trying to is out of the map,
78	* bail now - we know it can't work.
79	*/
80	if (mflags & P_OUT_OF_MAP) return 0;
81
82
83	/* Is this space blocked? Players with wizpass are immune to
84	* this condition.
85	*/
86	if(blocked_link(op, m, newx, newy) &&
87	!QUERY_FLAG(op, FLAG_WIZPASS))
88	return 0;
89
90	/* 0.94.2 - we need to set the direction for the new animation code.
91	* it uses it to figure out face to use - I can't see it
92	* breaking anything, but it might.
93	*/
94	if(op->more != NULL && !move_ob(op->more, dir, op->more->head))
95	return 0;
96
97	op->direction = dir;
98
99	if(op->will_apply&4)
100	check_earthwalls(op,m, newx,newy);
101	if(op->will_apply&8)
102	check_doors(op,m, newx,newy);
103
104	/* 0.94.1 - I got a stack trace that showed it crash with remove_ob trying
105	* to remove a removed object, and this function was the culprit. A possible
106	* guess I have is that check_doors above ran into a trap, killing the
107	* monster.
108	*
109	* Unfortunately, it doesn't appear that the calling functions of move_object
110	* deal very well with op being killed, so all this might do is just
111	* migrate the problem someplace else.
112	*/
113
114	if (QUERY_FLAG(op, FLAG_REMOVED)) {
115	LOG(llevDebug,"move_object: monster has been removed - will not process further\n");
116	/* Was not successful, but don't want to try and move again */
117	return 1;
118	}
119
120	/* If this is a tail portion, just want to tell caller that move is
121	* ok - the caller will deal with actual object removal/insertion
122	*/
123	if(op->head)
124	return 1;
125
126	remove_ob(op);
127
128	/* we already have newx, newy, and m, so lets use them.
129	* In addition, this fixes potential crashes, because multipart object was
130	* on edge of map, +=x, +=y doesn't make correct coordinates.
131	*/
132	for(tmp = op; tmp != NULL; tmp = tmp->more) {
133	tmp->x = newx + tmp->arch->clone.x;
134	tmp->y = newy + tmp->arch->clone.y;
135	tmp->map = m;
136	}
137
138	/* insert_ob_in_map will deal with any tiling issues */
139	insert_ob_in_map(op, m, originator,0);
140
141	/* Hmmm. Should be possible for multispace players now */
142	if (op->type==PLAYER) {
143	esrv_map_scroll(&op->contr->socket, freearr_x[dir],freearr_y[dir]);
144	op->contr->socket.update_look=1;
145	op->contr->socket.look_position=0;
146	}
147
148	return 1; /* this shouldn't be reached */
149	}
150
151
152	/*
153	* transfer_ob(): Move an object (even linked objects) to another spot
154	* on the same map.
155	*
156	* Does nothing if there is no free spot.
157	*
158	* randomly: If true, use find_free_spot() to find the destination, otherwise
159	* use find_first_free_spot().
160	*
161	* Return value: 1 if object was destroyed, 0 otherwise.
162	*/
163
164	int transfer_ob (object op, int x, int y, int randomly, object originator)
165	{
166	int i;
167	object *tmp;
168
169	if (randomly)
170	i = find_free_spot (op,op->map,x,y,0,SIZEOFFREE);
171	else
172	i = find_first_free_spot(op,op->map,x,y);
173
174	if (i==-1)
175	return 0; /* No free spot */
176
177	if(op->head!=NULL)
178	op=op->head;
179	remove_ob(op);
180	for(tmp=op;tmp!=NULL;tmp=tmp->more)
181	tmp->x=x+freearr_x[i]+(tmp->arch==NULL?0:tmp->arch->clone.x),
182	tmp->y=y+freearr_y[i]+(tmp->arch==NULL?0:tmp->arch->clone.y);
183
184	tmp = insert_ob_in_map(op,op->map,originator,0);
185	if (op && op->type == PLAYER) MapNewmapCmd(op->contr);
186	if (tmp) return 0;
187	else return 1;
188	}
189
190	/*
191	* Return value: 1 if object was destroyed, 0 otherwise.
192	* Modified so that instead of passing the 'originator' that had no
193	* real use, instead we pass the 'user' of the teleporter. All the
194	* callers know what they wanted to teleporter (move_teleporter or
195	* shop map code)
196	* tele_type is the type of teleporter we want to match against -
197	* currently, this is either set to SHOP_MAT or TELEPORTER.
198	* It is basically used so that shop_mats and normal teleporters can
199	* be used close to each other and not have the player put to the
200	* one of another type.
201	*/
202	int teleport (object teleporter, uint8 tele_type, object user)
203	{
204	object altern[120]; / Better use c/malloc here in the future */
205	int i,j,k,nrofalt=0;
206	object other_teleporter, tmp;
207	mapstruct *m;
208	sint16 sx, sy;
209
210	if(user==NULL) return 0;
211	if(user->head!=NULL)
212	user=user->head;
213
214	/* Find all other teleporters within range. This range
215	* should really be setable by some object attribute instead of
216	* using hard coded values.
217	*/
218	for(i= -5;i<6;i++)
219	for(j= -5;j<6;j++) {
220	if(i==0&&j==0)
221	continue;
222	/* Perhaps this should be extended to support tiled maps */
223	if(OUT_OF_REAL_MAP(teleporter->map,teleporter->x+i,teleporter->y+j))
224	continue;
225	other_teleporter=get_map_ob(teleporter->map,
226	teleporter->x+i,teleporter->y+j);
227
228	while (other_teleporter) {
229	if (other_teleporter->type == tele_type) break;
230	other_teleporter = other_teleporter->above;
231	}
232	if (other_teleporter)
233	altern[nrofalt++]=other_teleporter;
234	}
235
236	if(!nrofalt) {
237	LOG(llevError,"No alternative teleporters around!\n");
238	return 0;
239	}
240
241	other_teleporter=altern[RANDOM()%nrofalt];
242	k=find_free_spot(user,other_teleporter->map,
243	other_teleporter->x,other_teleporter->y,1,9);
244
245	/* if k==-1, unable to find a free spot. If this is shop
246	* mat that the player is using, find someplace to move
247	* the player - otherwise, player can get trapped in the shops
248	* that appear in random dungeons. We basically just make
249	* sure the space isn't no pass (eg wall), and don't care
250	* about is alive.
251	*/
252	if (k==-1) {
253	if (tele_type == SHOP_MAT && user->type == PLAYER) {
254	for (k=1; k<9; k++) {
255	if (get_map_flags(other_teleporter->map, &m,
256	other_teleporter->x + freearr_x[k],
257	other_teleporter->y + freearr_y[k], &sx,&sy) &
258	P_OUT_OF_MAP) continue;
259
260	if (!OB_TYPE_MOVE_BLOCK(user, GET_MAP_MOVE_BLOCK(m, sx, sy))) break;
261
262	}
263	if (k==9) {
264	LOG(llevError,"Shop mat %s (%d, %d) is in solid rock?\n",
265	other_teleporter->name, other_teleporter->x, other_teleporter->y);
266	return 0;
267	}
268	}
269	else return 0;
270	}
271
272	remove_ob(user);
273
274	/* Update location for the object */
275	for(tmp=user;tmp!=NULL;tmp=tmp->more) {
276	tmp->x=other_teleporter->x+freearr_x[k]+
277	(tmp->arch==NULL?0:tmp->arch->clone.x);
278	tmp->y=other_teleporter->y+freearr_y[k]+
279	(tmp->arch==NULL?0:tmp->arch->clone.y);
280	}
281	tmp = insert_ob_in_map(user,other_teleporter->map,NULL,0);
282	if (tmp && tmp->type == PLAYER) MapNewmapCmd(tmp->contr);
283	return (tmp == NULL);
284	}
285
286	void recursive_roll(object op,int dir,object pusher) {
287	if(!roll_ob(op,dir,pusher)) {
288	new_draw_info_format(NDI_UNIQUE, 0, pusher,
289	"You fail to push the %s.",query_name(op));
290	return;
291	}
292	(void) move_ob(pusher,dir,pusher);
293	new_draw_info_format(NDI_BLACK, 0, pusher,
294	"You move the %s.",query_name(op));
295	return;
296	}
297
298	/*
299	* This is a new version of blocked, this one handles objects
300	* that can be passed through by monsters with the CAN_PASS_THRU defined.
301	*
302	* very new version handles also multipart objects
303	* This is currently only used for the boulder roll code.
304	* Returns 1 if object does not fit, 0 if it does.
305	*/
306
307	int try_fit (object op, mapstruct m, int x, int y)
308	{
309	object tmp, more;
310	sint16 tx, ty;
311	int mflags;
312	mapstruct *m2;
313
314	if (op->head)
315	op = op->head;
316
317	for (more = op; more ; more = more->more) {
318	tx = x + more->x - op->x;
319	ty = y + more->y - op->y;
320
321	mflags = get_map_flags(m, &m2, tx, ty, &tx, &ty);
322
323	if (mflags & P_OUT_OF_MAP)
324	return 1;
325
326	for (tmp = get_map_ob (m2, tx, ty); tmp; tmp=tmp->above) {
327	if (tmp->head == op \|\| tmp == op)
328	continue;
329
330	if ((QUERY_FLAG(tmp,FLAG_ALIVE) && tmp->type!=DOOR))
331	return 1;
332
333	if (OB_MOVE_BLOCK(op, tmp)) return 1;
334
335	}
336	}
337	return 0;
338	}
339
340	/*
341	* this is not perfect yet.
342	* it does not roll objects behind multipart objects properly.
343	* Support for rolling multipart objects is questionable.
344	*/
345
346	int roll_ob(object op,int dir, object pusher) {
347	object *tmp;
348	sint16 x, y;
349	int flags;
350	mapstruct *m;
351	MoveType move_block;
352
353	if (op->head)
354	op = op->head;
355
356	x=op->x+freearr_x[dir];
357	y=op->y+freearr_y[dir];
358
359	if(!QUERY_FLAG(op,FLAG_CAN_ROLL) \|\|
360	(op->weight &&
361	random_roll(0, op->weight/50000-1, pusher, PREFER_LOW) > pusher->stats.Str))
362	return 0;
363
364	m = op->map;
365	flags = get_map_flags(m, &m, x, y, &x, &y);
366
367	if (flags & (P_OUT_OF_MAP \| P_IS_ALIVE))
368	return 0;
369
370	move_block = GET_MAP_MOVE_BLOCK(m, x, y);
371
372	/* If the target space is not blocked, no need to look at the objects on it */
373	if ((op->move_type & move_block) == op->move_type) {
374	for (tmp=get_map_ob(m, x, y); tmp!=NULL; tmp=tmp->above) {
375	if (tmp->head == op)
376	continue;
377	if (OB_MOVE_BLOCK(op, tmp) && !roll_ob(tmp,dir,pusher))
378	return 0;
379	}
380	}
381	if (try_fit (op, m, x, y))
382	return 0;
383
384	remove_ob(op);
385	for(tmp=op; tmp!=NULL; tmp=tmp->more)
386	tmp->x+=freearr_x[dir],tmp->y+=freearr_y[dir];
387	insert_ob_in_map(op,op->map,pusher,0);
388	return 1;
389	}
390
391	/* returns 1 if pushing invokes a attack, 0 when not */
392	int push_ob(object who, int dir, object pusher) {
393	int str1, str2;
394	object *owner;
395
396	if (who->head != NULL)
397	who = who->head;
398	owner = get_owner(who);
399
400	/* Wake up sleeping monsters that may be pushed */
401	CLEAR_FLAG(who,FLAG_SLEEP);
402
403	/* player change place with his pets or summoned creature */
404	/* TODO: allow multi arch pushing. Can't be very difficult */
405	if (who->more == NULL
406	#ifdef COZY_SERVER
407	&&
408	(
409	(owner && owner->contr && pusher->contr
410	&& same_party (owner->contr->party, pusher->contr->party))
411	\|\| owner == pusher
412	)
413	#else
414	&& owner == pusher
415	#endif
416	) {
417	int temp;
418	mapstruct *m;
419
420	remove_ob(who);
421	remove_ob(pusher);
422	temp = pusher->x;
423	pusher->x = who->x;
424	who->x = temp;
425
426	temp = pusher->y;
427	pusher->y = who->y;
428	who->y = temp;
429
430	m = pusher->map;
431	pusher->map = who->map;
432	who->map = m;
433
434	insert_ob_in_map (who,who->map,pusher,0);
435	insert_ob_in_map (pusher,pusher->map,pusher,0);
436
437	/* we presume that if the player is pushing his put, he moved in
438	* direction 'dir'. I can' think of any case where this would not be
439	* the case. Putting the map_scroll should also improve performance some.
440	*/
441	if (pusher->type == PLAYER ) {
442	esrv_map_scroll(&pusher->contr->socket, freearr_x[dir],freearr_y[dir]);
443	pusher->contr->socket.update_look=1;
444	pusher->contr->socket.look_position=0;
445	}
446	return 0;
447	}
448
449
450	/* We want ONLY become enemy of evil, unaggressive monster. We must RUN in them */
451	/* In original we have here a unaggressive check only - that was the reason why */
452	/* we so often become an enemy of friendly monsters... */
453	/* funny: was they set to unaggressive 0 (= not so nice) they don't attack */
454
455	if(owner != pusher && pusher->type == PLAYER && who->type != PLAYER &&
456	!QUERY_FLAG(who,FLAG_FRIENDLY)&& !QUERY_FLAG(who,FLAG_NEUTRAL)) {
457	if(pusher->contr->run_on) /* only when we run */ {
458	new_draw_info_format(NDI_UNIQUE, 0, pusher,
459	"You start to attack %s !!",who->name);
460	CLEAR_FLAG(who,FLAG_UNAGGRESSIVE); /* the sucker don't like you anymore */
461	who->enemy = pusher;
462	return 1;
463	}
464	else
465	{
466	new_draw_info_format(NDI_UNIQUE, 0, pusher,
467	"You avoid attacking %s .",who->name);
468	}
469	}
470
471	/* now, lets test stand still. we NEVER can push stand_still monsters. */
472	if(QUERY_FLAG(who,FLAG_STAND_STILL))
473	{
474	new_draw_info_format(NDI_UNIQUE, 0, pusher,
475	"You can't push %s.",who->name);
476	return 0;
477	}
478
479	/* This block is basically if you are pushing friendly but
480	* non pet creaturs.
481	* It basically does a random strength comparision to
482	* determine if you can push someone around. Note that
483	* this pushes the other person away - its not a swap.
484	*/
485
486	str1 = (who->stats.Str>0?who->stats.Str:who->level);
487	str2 = (pusher->stats.Str>0?pusher->stats.Str:pusher->level);
488	if(QUERY_FLAG(who,FLAG_WIZ) \|\|
489	random_roll(str1, str1/2+str1*2, who, PREFER_HIGH) >=
490	random_roll(str2, str2/2+str2*2, pusher, PREFER_HIGH) \|\|
491	!move_object(who,dir))
492	{
493	if (who ->type == PLAYER) {
494	new_draw_info_format(NDI_UNIQUE, 0, who,
495	"%s tried to push you.",pusher->name);
496	}
497	return 0;
498	}
499
500	/* If we get here, the push succeeded.
501	* Let everyone know the status.
502	*/
503	if (who->type == PLAYER) {
504	new_draw_info_format(NDI_UNIQUE, 0, who,
505	"%s pushed you.",pusher->name);
506	}
507	if (pusher->type == PLAYER) {
508	new_draw_info_format(NDI_UNIQUE, 0, pusher,
509	"You pushed %s back.", who->name);
510	}
511
512	return 1;
513	}