Source:NetHack 3.1.0/monmove.c

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Below is the full text to monmove.c from the source code of NetHack 3.1.0. To link to a particular line, write [[NetHack 3.1.0/monmove.c#line123]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

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1.    /*	SCCS Id: @(#)monmove.c	3.1	92/12/06	*/
2.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    
5.    #include "hack.h"
6.    #include "mfndpos.h"
7.    #include "artifact.h"
8.    
9.    #ifdef OVL0
10.   
11.   static int FDECL(disturb,(struct monst *));
12.   static void FDECL(distfleeck,(struct monst *,int *,int *,int *));
13.   
14.   #endif /* OVL0 */
15.   #ifdef OVL1
16.   
17.   STATIC_OVL boolean FDECL(mdig_tunnel,(struct monst *));
18.   
19.   #endif /* OVL1 */
20.   #ifdef OVLB
21.   
22.   boolean /* TRUE : mtmp died */
23.   mb_trapped(mtmp)
24.   register struct monst *mtmp;
25.   {
26.   	if (flags.verbose) {
27.   	    if (cansee(mtmp->mx, mtmp->my))
28.   	       pline("KABOOM!!  You see a door explode.");
29.   	    else if (flags.soundok)
30.                  You("hear a distant explosion.");
31.   	}
32.   	mtmp->mstun = 1;
33.   	mtmp->mhp -= rnd(15);
34.   	if(mtmp->mhp <= 0) {
35.   		mondied(mtmp);
36.   		return(TRUE);
37.   	}
38.   	return(FALSE);
39.   }
40.   
41.   #endif /* OVLB */
42.   #ifdef OVL1
43.   
44.   /* Return TRUE if monster died, FALSE otherwise. */
45.   STATIC_OVL boolean
46.   mdig_tunnel(mtmp)
47.   register struct monst *mtmp;
48.   {
49.   	register struct rm *here;
50.   	register int pile;
51.   
52.   	here = &levl[mtmp->mx][mtmp->my];
53.   	if (here->typ == SDOOR) here->typ = DOOR;
54.   
55.   	/* Eats away door if present & closed or locked */
56.   	if(closed_door(mtmp->mx, mtmp->my)) {
57.   	    if (*in_rooms(mtmp->mx, mtmp->my, SHOPBASE))
58.   		add_damage(mtmp->mx, mtmp->my, 0L);
59.   	    unblock_point(mtmp->mx,mtmp->my);	/* vision */
60.   	    if(here->doormask & D_TRAPPED) {
61.   		here->doormask = D_NODOOR;
62.   		if(mb_trapped(mtmp)) {	/* mtmp is killed */
63.   		    newsym(mtmp->mx,mtmp->my);
64.   		    return TRUE;
65.   		}
66.   	    } else {
67.   		if(!rn2(3) && flags.verbose)	/* not too often.. */
68.   		    You("feel an unexpected draft of air.");
69.   		here->doormask = D_BROKEN;
70.   	    }
71.   	    newsym(mtmp->mx,mtmp->my);
72.   	    return FALSE;
73.   	} else
74.   	if (!IS_ROCK(here->typ)) /* no dig */
75.   	    return(FALSE);
76.   
77.   	/* Only rock and walls fall through to this point. */
78.   	if ((here->diggable & W_NONDIGGABLE)) {
79.   	    impossible("mdig_tunnel:  %s at (%d,%d) is undiggable",
80.   		       (IS_WALL(here->typ) ? "wall" : "stone"),
81.   		       (int) mtmp->mx, (int) mtmp->my);
82.   		return FALSE;	/* still alive */
83.   	}
84.   
85.   	if(IS_WALL(here->typ)) {
86.   	    if(flags.soundok && flags.verbose && !rn2(5))
87.   		You("hear the sound of crashing rock.");
88.   	    if (*in_rooms(mtmp->mx, mtmp->my, SHOPBASE))
89.   	    	add_damage(mtmp->mx, mtmp->my, 0L);
90.   	    if (level.flags.is_maze_lev) {
91.   		here->typ = ROOM;
92.   	    } else if (level.flags.is_cavernous_lev) {
93.   		here->typ = CORR;
94.   	    } else {
95.   		here->typ = DOOR;
96.   		here->doormask = D_NODOOR;
97.   	    }
98.   	} else	
99.   	    here->typ = CORR;
100.  
101.  	pile = rnd(12);
102.  	if(pile < 5)	/* leave behind some rocks? */
103.  		(void) mksobj_at((pile == 1)? BOULDER : ROCK, 
104.  				 mtmp->mx, mtmp->my, TRUE);
105.  	newsym(mtmp->mx,mtmp->my);
106.  	if(sobj_at(BOULDER, mtmp->mx, mtmp->my) == (struct obj *)0)
107.  	    unblock_point(mtmp->mx,mtmp->my);	/* vision */
108.  	return FALSE ;
109.  }
110.  
111.  int
112.  dochugw(mtmp)
113.  	register struct monst *mtmp;
114.  {
115.  	register int x = mtmp->mx;
116.  	register int y = mtmp->my;
117.  	register int rd = dochug(mtmp);
118.  	register int dd;
119.  
120.  	if(Warning && !rd && !mtmp->mpeaceful &&
121.  			(dd = distu(mtmp->mx,mtmp->my)) < distu(x,y) &&
122.  			dd < 100 && !canseemon(mtmp)) {
123.  	    /* Note: this assumes we only want to warn against the monster to
124.  	     * which the weapon does extra damage, as there is no "monster
125.  	     * which the weapon warns against" field.
126.  	     */
127.  	    if(spec_ability(uwep,SPFX_WARN) && spec_dbon(uwep,mtmp->data,1))
128.  		warnlevel = 100;
129.  	    else if ((int) (mtmp->m_lev / 4) > warnlevel)
130.  		warnlevel = (mtmp->m_lev / 4);
131.  	}
132.  	/* check whether hero notices monster and stops current activity */
133.  	if (occupation && !rd && !Confusion &&
134.  	    (!mtmp->mpeaceful || Hallucination) &&
135.  	    canseemon(mtmp) && !cansee(x,y) &&
136.  	    distu(mtmp->mx,mtmp->my) <= (BOLT_LIM+1)*(BOLT_LIM+1))
137.  		stop_occupation();
138.  
139.  	return(rd);
140.  }
141.  
142.  #endif /* OVL1 */
143.  #ifdef OVL2
144.  
145.  boolean
146.  onscary(x, y, mtmp)
147.  int x, y;
148.  struct monst *mtmp;
149.  {
150.  	if (mtmp->isshk || mtmp->isgd || mtmp->iswiz || !mtmp->mcansee ||
151.  			is_lminion(mtmp->data) || is_rider(mtmp->data) ||
152.  			mtmp->data->mlet == S_HUMAN || mtmp->mpeaceful ||
153.  			mtmp->data == &mons[PM_MINOTAUR])
154.  		return(FALSE);
155.  	return(
156.  #ifdef ELBERETH
157.  		   sengr_at("Elbereth", x, y) ||
158.  #endif
159.  		    sobj_at(SCR_SCARE_MONSTER, x, y) != (struct obj *)0);
160.  }
161.  
162.  #endif /* OVL2 */
163.  #ifdef OVL0
164.  
165.  /*
166.   * Possibly awaken the given monster.  Return a 1 if the monster has been
167.   * jolted awake.
168.   */
169.  static int
170.  disturb(mtmp)
171.  	register struct monst *mtmp;
172.  {
173.  	/*
174.  	 * + Ettins are hard to surprise.
175.  	 * + Nymphs, jabberwocks, and leprechauns do not easily wake up.
176.  	 *
177.  	 * Wake up if:
178.  	 *	in direct LOS						AND
179.  	 *	within 10 squares					AND
180.  	 *	not stealthy or (mon is an ettin and 9/10)		AND
181.  	 *	(mon is not a nymph, jabberwock, or leprechaun) or 1/50	AND
182.  	 *	Aggravate or mon is (dog or human) or
183.  	 *	    (1/7 and mon is not mimicing furniture or object)
184.  	 */
185.  	if(couldsee(mtmp->mx,mtmp->my) &&
186.  		distu(mtmp->mx,mtmp->my) <= 100 &&
187.  		(!Stealth || (mtmp->data == &mons[PM_ETTIN] && rn2(10))) &&
188.  		(!(mtmp->data->mlet == S_NYMPH
189.  			|| mtmp->data == &mons[PM_JABBERWOCK]
190.  			|| mtmp->data->mlet == S_LEPRECHAUN) || !rn2(50)) &&
191.  		(Aggravate_monster
192.  			|| (mtmp->data->mlet == S_DOG ||
193.  				mtmp->data->mlet == S_HUMAN)
194.  			|| (!rn2(7) && mtmp->m_ap_type != M_AP_FURNITURE &&
195.  				mtmp->m_ap_type != M_AP_OBJECT) )) {
196.  
197.  		mtmp->msleep = 0;
198.  		return(1);
199.  	}
200.  	return(0);
201.  }
202.  
203.  static void
204.  distfleeck(mtmp,inrange,nearby,scared)
205.  register struct monst *mtmp;
206.  int *inrange, *nearby, *scared;
207.  {
208.  	int seescaryx, seescaryy;
209.  
210.  	*inrange = (dist2(mtmp->mx, mtmp->my, mtmp->mux, mtmp->muy) <=
211.  							(BOLT_LIM * BOLT_LIM));
212.  	*nearby = *inrange && monnear(mtmp, mtmp->mux, mtmp->muy);
213.  
214.  	/* Note: if your image is displaced, the monster sees the Elbereth
215.  	 * at your displaced position, thus never attacking your displaced
216.  	 * position, but possibly attacking you by accident.  If you are
217.  	 * invisible, it sees the Elbereth at your real position, thus never
218.  	 * running into you by accident but possibly attacking the spot
219.  	 * where it guesses you are.
220.  	 */
221.  	if (Invis && !perceives(mtmp->data)) {
222.  		seescaryx = mtmp->mux;
223.  		seescaryy = mtmp->muy;
224.  	} else {
225.  		seescaryx = u.ux;
226.  		seescaryy = u.uy;
227.  	}
228.  	*scared = (*nearby && (onscary(seescaryx, seescaryy, mtmp) ||
229.  			       (!mtmp->mpeaceful &&
230.  				    in_your_sanctuary(mtmp->mx, mtmp->my))));
231.  
232.  	if(*scared && !mtmp->mflee) {
233.  #ifdef POLYSELF
234.  		if (!sticks(uasmon))
235.  #endif
236.  			unstuck(mtmp);	/* monster lets go when fleeing */
237.  		mtmp->mflee = 1;
238.  #ifdef STUPID
239.  		if (rn2(7))
240.  		    mtmp->mfleetim = rnd(10);
241.  		else
242.  		    mtmp->mfleetim = rnd(100);
243.  #else
244.  		mtmp->mfleetim = rnd(rn2(7) ? 10 : 100);
245.  #endif
246.  	}
247.  
248.  }
249.  
250.  /* returns 1 if monster died moving, 0 otherwise */
251.  /* The whole dochugw/m_move/distfleeck/mfndpos section is serious spaghetti
252.   * code. --KAA
253.   */
254.  int
255.  dochug(mtmp)
256.  register struct monst *mtmp;
257.  {
258.  	register struct permonst *mdat = mtmp->data;
259.  	register int tmp=0;
260.  	int inrange, nearby, scared;
261.  
262.  /*	Pre-movement adjustments	*/
263.  
264.  	if(mtmp->cham && !rn2(6))	/* polymorph chameleons */
265.  	    (void) newcham(mtmp, (struct permonst *)0);
266.  
267.  	/* regenerate monsters */
268.  	if (mtmp->mhp < mtmp->mhpmax && (!(moves%20) || regenerates(mdat)))
269.  		mtmp->mhp++;
270.  	if(mtmp->mspec_used) mtmp->mspec_used--;
271.  
272.  	/* polymorph lycanthropes */
273.  	were_change(mtmp);
274.  
275.  	/* check for waitmask status change */
276.  	if((mtmp->data->mflags3 & M3_WAITFORU) &&
277.  	   (m_canseeu(mtmp) || mtmp->mhp < mtmp->mhpmax))
278.  	    mtmp->data->mflags3 &= ~M3_WAITFORU;
279.  
280.  #ifdef MULDGN
281.  	/* update quest status flags */
282.  	quest_stat_check(mtmp);
283.  #endif
284.  
285.  	if(!mtmp->mcanmove || (mtmp->data->mflags3 & M3_WAITMASK)) {
286.  	    if (Hallucination) newsym(mtmp->mx,mtmp->my);
287.  #ifdef MULDGN
288.  	    if(mtmp->mcanmove && (mtmp->data->mflags3 & M3_CLOSE) &&
289.  	       !mtmp->msleep && monnear(mtmp, u.ux, u.uy))
290.  		quest_talk(mtmp);	/* give the leaders a chance to speak */
291.  #endif
292.  	    return(0);	/* other frozen monsters can't do anything */
293.  	}
294.  
295.  	/* there is a chance we will wake it */
296.  	if(mtmp->msleep && !disturb(mtmp)) {
297.  		if (Hallucination) newsym(mtmp->mx,mtmp->my);
298.  		return(0);
299.  	}
300.  
301.  	/* not frozen or sleeping: wipe out texts written in the dust */
302.  	wipe_engr_at(mtmp->mx, mtmp->my, 1);
303.  
304.  	/* confused monsters get unconfused with small probability */
305.  	if(mtmp->mconf && !rn2(50)) mtmp->mconf = 0;
306.  
307.  	/* stunned monsters get un-stunned with larger probability */
308.  	if(mtmp->mstun && !rn2(10)) mtmp->mstun = 0;
309.  
310.  	/* some monsters teleport */
311.  	if(mtmp->mflee && !rn2(40) && can_teleport(mdat) && !mtmp->iswiz) {
312.  		rloc(mtmp);
313.  		return(0);
314.  	}
315.  	if(mdat->msound == MS_SHRIEK && !um_dist(mtmp->mx, mtmp->my, 1))
316.  	    m_respond(mtmp);
317.  	if(mdat->mmove < rnd(6)) return(0);
318.  
319.  	/* fleeing monsters might regain courage */
320.  	if(mtmp->mflee && !mtmp->mfleetim
321.  	   && mtmp->mhp == mtmp->mhpmax && !rn2(25)) mtmp->mflee = 0;
322.  
323.  	set_apparxy(mtmp);
324.  	/* Must be done after you move and before the monster does.  The
325.  	 * set_apparxy() call in m_move() doesn't suffice since the variables
326.  	 * inrange, etc. all depend on stuff set by set_apparxy().
327.  	 */
328.  
329.  	/* Monsters that want to acquire things */
330.  	/* may teleport, so do it before inrange is set */
331.  	if(is_covetous(mtmp->data)) (void) tactics(mtmp);
332.  
333.  	/* check distance and scariness of attacks */
334.  	distfleeck(mtmp,&inrange,&nearby,&scared);
335.  
336.  #ifdef MUSE
337.  	if(find_defensive(mtmp)) {
338.  		if (use_defensive(mtmp) != 0)
339.  			return 1;
340.  	} else if(find_misc(mtmp)) {
341.  		if (use_misc(mtmp) != 0)
342.  			return 1;
343.  	}
344.  #endif
345.  
346.  	/* Demonic Blackmail! */
347.  	if(nearby && mdat->msound == MS_BRIBE &&
348.  	   mtmp->mpeaceful && !mtmp->mtame) {
349.  		if (mtmp->mux != u.ux || mtmp->muy != u.uy) {
350.  			pline("%s whispers something to thin air.",
351.  			    cansee(mtmp->mux, mtmp->muy) ? Monnam(mtmp) : "It");
352.  #ifdef POLYSELF
353.  			if (is_demon(uasmon)) rloc(mtmp);
354.  			  /* "Good hunting, brother" */
355.  			else {
356.  #endif
357.  			    mtmp->minvis = 0;
358.  			    /* Why?  For the same reason in real demon talk */
359.  			    pline("%s gets angry.", Amonnam(mtmp));
360.  			    mtmp->mpeaceful = 0;
361.  			    /* since no way is an image going to pay it off */
362.  #ifdef POLYSELF
363.  			}
364.  #endif
365.  		} else if(demon_talk(mtmp)) return(1);	/* you paid it off */
366.  	}
367.  
368.  	if (mdat == &mons[PM_MIND_FLAYER] && !rn2(20)) {
369.  		struct monst *m2, *nmon = (struct monst *)0;
370.  
371.  		if (canseemon(mtmp))
372.  			pline("%s concentrates.", Monnam(mtmp));
373.  		if (distu(mtmp->mx, mtmp->my) > BOLT_LIM * BOLT_LIM) {
374.  			You("sense a faint wave of psychic energy.");
375.  			goto toofar;
376.  		}
377.  		You("sense a wave of psychic energy pouring over you!");
378.  		if (mtmp->mpeaceful &&
379.  		    (!Conflict || resist(mtmp, RING_CLASS, 0, 0)))
380.  			pline("It seems quite soothing.");
381.  		else {
382.  			register boolean m_sen = sensemon(mtmp);
383.  
384.  			if (m_sen || (Telepat && rn2(2)) || !rn2(10)) {
385.  				int dmg;
386.  				pline("It locks in on your %s!",
387.  					m_sen ? "telepathy" :
388.  					Telepat ? "latent telepathy" : "mind");
389.  				dmg = rnd(15);
390.  				if (Half_spell_damage) dmg = (dmg+1) / 2;
391.  				losehp(dmg, "psychic blast", KILLED_BY_AN);
392.  			}
393.  		}
394.  		for(m2=fmon; m2; m2 = nmon) {
395.  			nmon = m2->nmon;
396.  			if (m2->mpeaceful != mtmp->mpeaceful) continue;
397.  			if (mindless(m2->data)) continue;
398.  			if (m2 == mtmp) continue;
399.  			if ((telepathic(m2->data) &&
400.  			    (rn2(2) || m2->mblinded)) || !rn2(10)) {
401.  				if (cansee(m2->mx, m2->my))
402.  				    pline("It locks in on %s.", mon_nam(m2));
403.  				m2->mhp -= rnd(15);
404.  				if (m2->mhp <= 0)
405.  				    monkilled(m2, "", AD_DRIN);
406.  			}
407.  		}
408.  	}
409.  toofar:
410.  #ifdef MUSE
411.  	/* If monster is nearby you, and has to wield a weapon, do so.   This
412.  	 * costs the monster a move, of course.
413.  	 */
414.  	if((!mtmp->mpeaceful || Conflict) && inrange &&
415.  	   dist2(mtmp->mx, mtmp->my, mtmp->mux, mtmp->muy) <= 8
416.  	   && attacktype(mdat, AT_WEAP)) {
417.  	    if (mtmp->weapon_check == NEED_WEAPON || !MON_WEP(mtmp)) {
418.  		mtmp->weapon_check = NEED_HTH_WEAPON;
419.  		if (mon_wield_item(mtmp) != 0) return(0);
420.  	    }
421.  	}
422.  #endif
423.  /*	Now the actual movement phase	*/
424.  
425.  	if(!nearby || mtmp->mflee || scared ||
426.  	   mtmp->mconf || mtmp->mstun || (mtmp->minvis && !rn2(3)) ||
427.  	   (mdat->mlet == S_LEPRECHAUN && !u.ugold && (mtmp->mgold || rn2(2))) ||
428.  	   (is_wanderer(mdat) && !rn2(4)) || (Conflict && !mtmp->iswiz) ||
429.  	   (!mtmp->mcansee && !rn2(4)) || mtmp->mpeaceful) {
430.  
431.  		tmp = m_move(mtmp, 0);
432.  		distfleeck(mtmp,&inrange,&nearby,&scared);	/* recalc */
433.  
434.  		switch (tmp) {
435.  
436.  		    case 0:	/* no movement, but it can still attack you */
437.  		    case 3:	/* absolutely no movement */
438.  				/* for pets, case 0 and 3 are equivalent */
439.   			/* During hallucination, monster appearance should
440.   			 * still change - even if it doesn't move.
441.    			 */
442.   			if(Hallucination) newsym(mtmp->mx,mtmp->my);
443.   			break;
444.   		    case 1:	/* monster moved */
445.  			/* Maybe it stepped on a trap and fell asleep... */
446.  			if(mtmp->msleep || !mtmp->mcanmove) return(0);
447.   			if(!nearby && ranged_attk(mdat)) break;
448.   			else if(mdat->mmove <= 12) {
449.  			    /* a monster that's digesting you can move at the
450.  			     * same time -dlc
451.  			     */
452.  			    if(u.uswallow && mtmp == u.ustuck)
453.  				return(mattacku(mtmp));
454.  			    return(0);
455.  			}
456.   			break;
457.   		    case 2:	/* monster died */
458.   			return(1);
459.   		}
460.  	}
461.  
462.  /*	Now, attack the player if possible - one attack set per monst	*/
463.  
464.  	if (!mtmp->mpeaceful ||
465.  	    (Conflict && !resist(mtmp, RING_CLASS, 0, 0))) {
466.  	    if(inrange && !noattacks(mdat) && u.uhp > 0 && !scared && tmp != 3)
467.  		if(mattacku(mtmp)) return(1); /* monster died (e.g. exploded) */
468.  
469.  	    if(mtmp->wormno) wormhitu(mtmp);
470.  	}
471.  #ifdef MULDGN
472.  	/* special speeches for quest monsters */
473.  	if(!mtmp->msleep && mtmp->mcanmove && nearby)
474.  		quest_talk(mtmp);
475.  	else
476.  #endif
477.  	    /* extra emotional attack for vile monsters */
478.  	    if(inrange && mtmp->data->msound == MS_CUSS && !mtmp->mpeaceful &&
479.  	       couldsee(mtmp->mx, mtmp->my) && !mtmp->minvis && !rn2(5))
480.  		cuss(mtmp);
481.  
482.  	/* extra movement for fast monsters */
483.  	if(mdat->mmove-12 > rnd(12)) tmp = m_move(mtmp, 1);
484.  	return(tmp == 2);
485.  }
486.  
487.  static const char NEARDATA practical[] = { WEAPON_CLASS, ARMOR_CLASS, GEM_CLASS, FOOD_CLASS, 0 };
488.  static const char NEARDATA magical[] = {
489.  	AMULET_CLASS, POTION_CLASS, SCROLL_CLASS, WAND_CLASS, RING_CLASS,
490.  	SPBOOK_CLASS, 0 };
491.  static const char NEARDATA indigestion[] = { BALL_CLASS, ROCK_CLASS, 0 };
492.  
493.  #ifdef POLYSELF
494.  boolean
495.  itsstuck(mtmp)
496.  register struct monst *mtmp;
497.  {
498.  	if (sticks(uasmon) && mtmp==u.ustuck && !u.uswallow) {
499.  		pline("%s cannot escape from you!", Monnam(mtmp));
500.  		return(TRUE);
501.  	}
502.  	return(FALSE);
503.  }
504.  #endif
505.  
506.  int
507.  m_move(mtmp, after)
508.  register struct monst *mtmp;
509.  register int after;
510.  {
511.  	register int appr;
512.  	xchar gx,gy,nix,niy,chcnt;
513.  	int chi;	/* could be schar except for stupid Sun-2 compiler */
514.  	boolean likegold=0, likegems=0, likeobjs=0, likemagic=0, conceals=0;
515.  	boolean likerock=0, can_tunnel=0;
516.  	boolean can_open=0, can_unlock=0, doorbuster=0;
517.  #ifdef MUSE
518.  	boolean uses_items=0;
519.  #endif
520.  	struct permonst *ptr;
521.  	schar mmoved = 0;	/* not strictly nec.: chi >= 0 will do */
522.  	long info[9];
523.  	long flag;
524.  	int  omx = mtmp->mx, omy = mtmp->my;
525.  #ifdef MUSE
526.  	struct obj *mw_tmp;
527.  #endif
528.  
529.  	if(mtmp->mtrapped) {
530.  	    int i = mintrap(mtmp);
531.  	    if(i >= 2) { newsym(mtmp->mx,mtmp->my); return(2); }/* it died */
532.  	    if(i == 1) return(0);	/* still in trap, so didn't move */
533.  	}
534.  	ptr = mtmp->data; /* mintrap() can change mtmp->data -dlc */
535.  	if(hides_under(ptr) && OBJ_AT(mtmp->mx, mtmp->my) && rn2(10))
536.  	    return(0);		/* do not leave hiding place */
537.  	if(mtmp->meating) {
538.  	    mtmp->meating--;
539.  	    return(3);			/* still eating */
540.  	}
541.  
542.  	set_apparxy(mtmp);
543.  	/* where does mtmp think you are? */
544.  	/* Not necessary if m_move called from this file, but necessary in
545.  	 * other calls of m_move (ex. leprechauns dodging)
546.  	 */
547.  	can_tunnel = tunnels(ptr) &&
548.  #ifdef REINCARNATION
549.  	    !Is_rogue_level(&u.uz) &&
550.  #endif
551.  #ifdef MUSE
552.  		(!needspick(ptr) ||
553.  		 (m_carrying(mtmp, PICK_AXE) &&
554.  		  (mtmp->weapon_check != NO_WEAPON_WANTED ||
555.  		   !(mw_tmp = MON_WEP(mtmp)) || mw_tmp->otyp == PICK_AXE)));
556.  #else
557.  		(!needspick(ptr) || m_carrying(mtmp, PICK_AXE));
558.  #endif
559.  	can_open = !(nohands(ptr) || verysmall(ptr));
560.  	can_unlock = ((can_open && m_carrying(mtmp, SKELETON_KEY)) || mtmp->iswiz);
561.  	doorbuster = is_giant(ptr);
562.  	if(mtmp->wormno) goto not_special;
563.  	/* my dog gets special treatment */
564.  	if(mtmp->mtame) {
565.  	    mmoved = dog_move(mtmp, after);
566.  	    goto postmov;
567.  	}
568.  
569.  	/* likewise for shopkeeper */
570.  	if(mtmp->isshk) {
571.  	    mmoved = shk_move(mtmp);
572.  	    if(mmoved == -2) return(2);
573.  	    if(mmoved >= 0) goto postmov;
574.  	    mmoved = 0;		/* follow player outside shop */
575.  	}
576.  
577.  	/* and for the guard */
578.  	if(mtmp->isgd) {
579.  	    mmoved = gd_move(mtmp);
580.  	    if(mmoved == -2) return(2);
581.  	    if(mmoved >= 0) goto postmov;
582.  	    mmoved = 0;
583.  	}
584.  
585.  	/* and the acquisitive monsters get special treatment */
586.  	if(is_covetous(ptr)) {
587.  	    xchar tx = (xchar)((mtmp->mstrategy >> 16) & 0xff),
588.  		  ty = (xchar)((mtmp->mstrategy >> 8) & 0xff);
589.  	    struct monst *intruder = m_at(tx, ty);
590.  	    /*
591.  	     * if there's a monster on the object or in possesion of it,
592.  	     * attack it.
593.  	     */
594.  	    if((dist2(mtmp->mx, mtmp->my, tx, ty) < 2) &&
595.  	       intruder && (intruder != mtmp)) {
596.  
597.  		if(mattackm(mtmp, intruder) == 2) return(2);
598.  		mmoved = 1;
599.  	    } else mmoved = 0;
600.  	    goto postmov;
601.  	}
602.  
603.  	/* and for the priest */
604.  	if(mtmp->ispriest) {
605.  	    mmoved = pri_move(mtmp);
606.  	    if(mmoved == -2) return(2);
607.  	    if(mmoved >= 0) goto postmov;
608.  	    mmoved = 0;
609.  	}
610.  
611.  #ifdef MAIL
612.  	if(ptr == &mons[PM_MAIL_DAEMON]) {
613.  	    if(flags.soundok && canseemon(mtmp))
614.  		verbalize("I'm late!");
615.  	    mongone(mtmp);
616.  	    return(2);	    
617.  	}
618.  #endif
619.  
620.  	/* teleport if that lies in our nature */
621.  	if(ptr == &mons[PM_TENGU] && !rn2(5) && !mtmp->mcan) {
622.  	    if(mtmp->mhp < 7 || mtmp->mpeaceful || rn2(2))
623.  		rloc(mtmp);
624.  	    else
625.  		mnexto(mtmp);
626.  	    mmoved = 1;
627.  	    goto postmov;
628.  	}
629.  not_special:
630.  	if(u.uswallow && !mtmp->mflee && u.ustuck != mtmp) return(1);
631.  	appr = 1;
632.  	omx = mtmp->mx;
633.  	omy = mtmp->my;
634.  	gx = mtmp->mux;
635.  	gy = mtmp->muy;
636.  	if(mtmp->mflee) appr = -1;
637.  	if (mtmp->mconf || (u.uswallow && mtmp == u.ustuck))
638.  		appr = 0;
639.  	else {
640.  		boolean should_see = (couldsee(omx, omy) && 	
641.    			  	      (levl[gx][gy].lit || 
642.  				       !levl[omx][omy].lit) &&
643.  				      (dist2(omx, omy, gx, gy) <= 36));
644.  
645.  		if (!mtmp->mcansee || 
646.  	    	    (should_see && Invis && !perceives(ptr)) || 
647.  #ifdef POLYSELF
648.  	            (u.usym == S_MIMIC_DEF) || u.uundetected ||
649.  #endif
650.  	            (mtmp->mpeaceful && !mtmp->isshk) ||  /* allow shks to follow */
651.  	            ((ptr->mlet == S_STALKER || ptr->mlet == S_BAT ||
652.  		      ptr->mlet == S_LIGHT) && !rn2(3)))
653.  			appr = 0;  
654.  	
655.  	    	if(monsndx(ptr) == PM_LEPRECHAUN && (appr == 1) && 
656.  	           (mtmp->mgold > u.ugold))
657.  			appr = -1;
658.  
659.  		if (!should_see && can_track(ptr)) {
660.  			register coord *cp;
661.  
662.  			cp = gettrack(omx,omy);
663.  			if (cp) {
664.  		    		gx = cp->x;
665.  		    		gy = cp->y;
666.  			}
667.  		}
668.  	}
669.  
670.  #ifdef REINCARNATION
671.  	if (!Is_rogue_level(&u.uz))
672.  #endif
673.  	{
674.  		register int pctload = (curr_mon_load(mtmp) * 100) /
675.  			max_mon_load(mtmp);
676.  
677.  		/* look for gold or jewels nearby */
678.  		likegold = (likes_gold(ptr) && pctload < 95);
679.  		likegems = (likes_gems(ptr) && pctload < 85);
680.  #ifdef MUSE
681.  		uses_items = (!mindless(ptr) && !is_animal(ptr)
682.  			&& pctload < 75);
683.  #endif
684.  		likeobjs = (likes_objs(ptr) && pctload < 75);
685.  		likemagic = (likes_magic(ptr) && pctload < 85);
686.  		likerock = (throws_rocks(ptr) && pctload < 50);
687.  		conceals = hides_under(ptr);
688.  	}
689.  
690.  #define SQSRCHRADIUS	5
691.  
692.        { register int minr = SQSRCHRADIUS;	/* not too far away */
693.  	register struct obj *otmp;
694.  	register int xx, yy;
695.  	int oomx, oomy, lmx, lmy;
696.  
697.  	/* cut down the search radius if it thinks character is closer. */
698.  	if(distmin(mtmp->mux, mtmp->muy, omx, omy) < SQSRCHRADIUS &&
699.  	    !mtmp->mpeaceful) minr--;
700.  	/* guards shouldn't get too distracted */
701.  	if(!mtmp->mpeaceful && is_mercenary(ptr)) minr = 1;
702.  
703.  	if((likegold || likegems || likeobjs || likemagic || likerock || conceals)
704.  	      && (!*in_rooms(omx, omy, SHOPBASE) || (!rn2(25) && !mtmp->isshk))) {
705.  	look_for_obj:
706.  	    oomx = min(COLNO-1, omx+minr);
707.  	    oomy = min(ROWNO-1, omy+minr);
708.  	    lmx = max(1, omx-minr);
709.  	    lmy = max(0, omy-minr);
710.  	    for(otmp = fobj; otmp; otmp = otmp->nobj) {
711.  		xx = otmp->ox;
712.  		yy = otmp->oy;
713.  		if(xx >= lmx && xx <= oomx && yy >= lmy && yy <= oomy) {
714.  		    if(((likegold && otmp->otyp == GOLD_PIECE) ||
715.  		       (likeobjs && index(practical, otmp->oclass)) ||
716.  		       (likemagic && index(magical, otmp->oclass)) ||
717.  #ifdef MUSE
718.  		       (uses_items && searches_for_item(mtmp, otmp)) ||
719.  #endif
720.  		       (likerock && otmp->otyp == BOULDER) ||
721.  		       (likegems && otmp->oclass == GEM_CLASS &&
722.  			objects[otmp->otyp].oc_material != MINERAL) ||
723.  		       (conceals && !cansee(otmp->ox,otmp->oy)) ||
724.  		       (ptr == &mons[PM_GELATINOUS_CUBE] &&
725.  			!index(indigestion, otmp->oclass) &&
726.  			!(otmp->otyp == CORPSE &&
727.  			  otmp->corpsenm == PM_COCKATRICE))
728.  		      ) && touch_artifact(otmp,mtmp)) {
729.  			if(can_carry(mtmp,otmp) &&
730.  			   (throws_rocks(ptr) ||
731.  				!sobj_at(BOULDER,xx,yy)) &&
732.  			   (ptr->mlet != S_UNICORN ||
733.  			    objects[otmp->otyp].oc_material == GEMSTONE)) {
734.  			    minr = distmin(omx,omy,xx,yy);
735.  			    oomx = min(COLNO-1, omx+minr);
736.  			    oomy = min(ROWNO-1, omy+minr);
737.  			    lmx = max(1, omx-minr);
738.  			    lmy = max(0, omy-minr);
739.  			    gx = otmp->ox;
740.  			    gy = otmp->oy;
741.  			}
742.  		    }
743.  		}
744.  	    }
745.  	} else if(likegold) {
746.  	    /* don't try to pick up anything else, but use the same loop */
747.  #ifdef MUSE
748.  	    uses_items =
749.  #endif
750.  	    likegems = likeobjs = likemagic = likerock = conceals = 0;
751.  	    goto look_for_obj;
752.  	}
753.  
754.  	if(minr < SQSRCHRADIUS && appr == -1) {
755.  	    if(distmin(omx,omy,mtmp->mux,mtmp->muy) <= 3) {
756.  		gx = mtmp->mux;
757.  		gy = mtmp->muy;
758.  	    } else
759.  		appr = 1;
760.  	}
761.        }
762.  	nix = omx;
763.  	niy = omy;
764.  	flag = ALLOW_TRAPS;
765.  	if (mtmp->mpeaceful && (!Conflict || resist(mtmp, RING_CLASS, 0, 0)))
766.  	    flag |= (ALLOW_SANCT | ALLOW_SSM);
767.  	else flag |= ALLOW_U;
768.  	if (ptr->mlet == S_UNICORN) flag |= NOTONL;
769.  	if (passes_walls(ptr)) flag |= (ALLOW_WALL | ALLOW_ROCK);
770.  	if (can_tunnel) flag |= ALLOW_DIG;
771.  	if (is_human(ptr) || ptr == &mons[PM_MINOTAUR]) flag |= ALLOW_SSM;
772.  	if (is_undead(ptr)) flag |= NOGARLIC;
773.  	if (throws_rocks(ptr)) flag |= ALLOW_ROCK;
774.  	if (can_open) flag |= OPENDOOR;
775.  	if (can_unlock) flag |= UNLOCKDOOR;
776.  	if (doorbuster) flag |= BUSTDOOR;
777.  	{
778.  	    register int i, j, nx, ny, nearer;
779.  	    int jcnt, cnt;
780.  	    int ndist, nidist;
781.  	    register coord *mtrk;
782.  	    coord poss[9];
783.  
784.  	    cnt = mfndpos(mtmp, poss, info, flag);
785.  	    chcnt = 0;
786.  	    jcnt = min(MTSZ, cnt-1);
787.  	    chi = -1;
788.  	    nidist = dist2(nix,niy,gx,gy);
789.  	    /* allow monsters be shortsighted on some levels for balance */
790.  	    if(!mtmp->mpeaceful && level.flags.shortsighted &&
791.  	       nidist > (couldsee(nix,niy) ? 144 : 36) && appr == 1) appr = 0;
792.  
793.  	    for(i=0; i < cnt; i++) {
794.  		nx = poss[i].x;
795.  		ny = poss[i].y;
796.  
797.  		if (appr != 0) {
798.  		    mtrk = &mtmp->mtrack[0];
799.  		    for(j=0; j < jcnt; mtrk++, j++)
800.  			if(nx == mtrk->x && ny == mtrk->y)
801.  			    if(rn2(4*(cnt-j)))
802.  				goto nxti;
803.  		}
804.  
805.  		nearer = ((ndist = dist2(nx,ny,gx,gy)) < nidist);
806.  
807.  		if((appr == 1 && nearer) || (appr == -1 && !nearer) ||
808.  		   (!appr && !rn2(++chcnt)) || !mmoved) {
809.  		    nix = nx;
810.  		    niy = ny;
811.  		    nidist = ndist;
812.  		    chi = i;
813.  		    mmoved = 1;
814.  		}
815.  	    nxti:	;
816.  	    }
817.  	}
818.  
819.  	if(mmoved) {
820.  	    register int j;
821.  #ifdef POLYSELF
822.  	    if (mmoved==1 && (u.ux != nix || u.uy != niy) && itsstuck(mtmp))
823.  		return(3);
824.  #endif
825.  #ifdef MUSE
826.  	    if (mmoved==1 && can_tunnel && needspick(ptr) &&
827.  		(!(mw_tmp = MON_WEP(mtmp)) || mw_tmp->otyp != PICK_AXE)) {
828.  		mtmp->weapon_check = NEED_PICK_AXE;
829.  		(void)mon_wield_item(mtmp);
830.  	    }
831.  #endif
832.  	    /* If ALLOW_U is set, either it's trying to attack you, or it
833.  	     * thinks it is.  In either case, attack this spot in preference to
834.  	     * all others.
835.  	     */
836.  	    if(info[chi] & ALLOW_U) {
837.  		nix = mtmp->mux;
838.  		niy = mtmp->muy;
839.  	    }
840.  	    if (nix == u.ux && niy == u.uy) {
841.  		mtmp->mux = u.ux;
842.  		mtmp->muy = u.uy;
843.  		return(0);
844.  	    }
845.  	    /* The monster may attack another based on 1 of 2 conditions:
846.  	     * 1 - It may be confused.
847.  	     * 2 - It may mistake the monster for your (displaced) image.
848.  	     * Pets get taken care of above and shouldn't reach this code.
849.  	     * Conflict gets handled even farther away (movemon()).
850.  	     */
851.  	    if((info[chi] & ALLOW_M) ||
852.  		   (nix == mtmp->mux && niy == mtmp->muy)) {
853.  		struct monst *mtmp2;
854.  		int stat;
855.  		mtmp2 = m_at(nix,niy);
856.  
857.  		stat = mattackm(mtmp, mtmp2);
858.  
859.  		if (stat & MM_AGR_DIED)		/* aggressor died */
860.  		    return 2;
861.  
862.  		if ((stat & MM_HIT) && !(stat & MM_DEF_DIED)  &&
863.  		    rn2(4) && mtmp2->mlstmv != monstermoves) {
864.  		    stat = mattackm(mtmp2, mtmp);	/* return attack */
865.  		    if (stat & MM_DEF_DIED)
866.  			return 2;
867.  		}
868.  		return 3;
869.  	    }
870.  
871.  	    remove_monster(omx, omy);
872.  	    place_monster(mtmp, nix, niy);
873.  	    for(j = MTSZ-1; j > 0; j--)
874.  		mtmp->mtrack[j] = mtmp->mtrack[j-1];
875.  	    mtmp->mtrack[0].x = omx;
876.  	    mtmp->mtrack[0].y = omy;
877.  	    /* Place a segment at the old position. */
878.  	    if (mtmp->wormno) worm_move(mtmp);
879.  	} else {
880.  	    if(ptr->mlet == S_UNICORN && rn2(2)) {
881.  		rloc(mtmp);
882.  		return(1);
883.  	    }
884.  	    if(mtmp->wormno) worm_nomove(mtmp);
885.  	}
886.  postmov:
887.  	if(mmoved == 1) {
888.  	    boolean canseeit = cansee(mtmp->mx, mtmp->my);
889.  	    boolean abstain = (mtmp->mpeaceful && !mtmp->mtame);
890.  
891.  	    newsym(omx,omy);		/* update the old position */
892.  	    if (mintrap(mtmp) >= 2) {
893.  		if(mtmp->mx) newsym(mtmp->mx,mtmp->my);
894.  		return(2);	/* it died */
895.  	    }
896.  	    ptr = mtmp->data;
897.  
898.  	    /* open a door, or crash through it, if you can */
899.  	    if(IS_DOOR(levl[mtmp->mx][mtmp->my].typ)
900.  		    && !passes_walls(ptr) /* doesn't need to open doors */
901.  		    && !can_tunnel /* taken care of below */
902.  		  ) {
903.  		struct rm *here = &levl[mtmp->mx][mtmp->my];
904.  		boolean btrapped = (here->doormask & D_TRAPPED);
905.  
906.  		if(here->doormask & (D_LOCKED|D_CLOSED) && amorphous(ptr)) {
907.  		    if (flags.verbose && canseeit)
908.  			pline("%s %ss under the door.", Monnam(mtmp),
909.  			      (ptr == &mons[PM_FOG_CLOUD] ||
910.  			       ptr == &mons[PM_YELLOW_LIGHT])
911.  			      ? "flow" : "ooze");
912.  		} else if(here->doormask & D_LOCKED && can_unlock) {
913.  		    if(btrapped) {
914.  			here->doormask = D_NODOOR;
915.  			newsym(mtmp->mx, mtmp->my);
916.  			unblock_point(mtmp->mx,mtmp->my); /* vision */
917.  			if(mb_trapped(mtmp)) return(2);
918.  		    } else {
919.  			if (flags.verbose) {
920.  			    if (canseeit)
921.  			      You("see a door being unlocked and opened.");
922.  			    else if (flags.soundok)
923.  			       You("hear a door being unlocked and opened.");
924.  		        }
925.  		        here->doormask = D_ISOPEN;
926.  			/* newsym(mtmp->mx, mtmp->my); */
927.  			unblock_point(mtmp->mx,mtmp->my); /* vision */
928.  		    }
929.  		} else if (here->doormask == D_CLOSED && can_open) {
930.  		    if(btrapped) {
931.  			here->doormask = D_NODOOR;
932.  			newsym(mtmp->mx, mtmp->my);
933.  			unblock_point(mtmp->mx,mtmp->my); /* vision */
934.  			if(mb_trapped(mtmp)) return(2);
935.  		    } else {
936.  		        if (flags.verbose) {
937.  			    if (canseeit)
938.  			         You("see a door being opened.");
939.  			    else if (flags.soundok)
940.  			         You("hear the sound of a door opening.");
941.  		        }
942.  		        here->doormask = D_ISOPEN;
943.  			/* newsym(mtmp->mx, mtmp->my); */  /* done below */
944.  			unblock_point(mtmp->mx,mtmp->my); /* vision */
945.  		    }
946.  		} else if (here->doormask & (D_LOCKED|D_CLOSED)) {
947.  		    /* mfndpos guarantees this must be a doorbuster */
948.  		    if(btrapped) {
949.  			here->doormask = D_NODOOR;
950.  			newsym(mtmp->mx, mtmp->my);
951.  			unblock_point(mtmp->mx,mtmp->my); /* vision */
952.  			if(mb_trapped(mtmp)) return(2);
953.  		    } else {
954.  		        if (flags.verbose) {
955.  			    if (canseeit)
956.  			        You("see a door crash open.");
957.  			    else if (flags.soundok)
958.  			        You("hear the sound of a door crashing open.");
959.  		        }
960.  		        if (here->doormask & D_LOCKED && !rn2(2))
961.  			        here->doormask = D_NODOOR;
962.  		        else here->doormask = D_BROKEN;
963.  			/* newsym(mtmp->mx, mtmp->my); */ /* done below */
964.  			unblock_point(mtmp->mx,mtmp->my); /* vision */
965.  		    }
966.  		}
967.  	    }
968.  
969.  	    /* possibly dig */
970.  	    if (can_tunnel && mdig_tunnel(mtmp))
971.  		    return(2);	/* mon died (position already updated) */
972.  
973.  	    /* set also in domove(), hack.c */
974.  	    if (u.uswallow && mtmp == u.ustuck &&
975.  					(mtmp->mx != omx || mtmp->my != omy)) {
976.  		/* If the monster moved, then update */
977.  		u.ux0 = u.ux;
978.  		u.uy0 = u.uy;
979.  		u.ux = mtmp->mx;
980.  		u.uy = mtmp->my;
981.  		swallowed(0);
982.  	    } else
983.  		newsym(mtmp->mx,mtmp->my);
984.  
985.  	    if(OBJ_AT(mtmp->mx, mtmp->my) && mtmp->mcanmove) {
986.  		/* Maybe a rock mole just ate some metal object */
987.  		if(metallivorous(ptr)) meatgold(mtmp);
988.  
989.  		if(g_at(mtmp->mx,mtmp->my) && likegold &&
990.  				    (!abstain || !rn2(10))) mpickgold(mtmp);
991.  
992.  		/* Maybe a cube ate just about anything */
993.  		if(ptr == &mons[PM_GELATINOUS_CUBE]) meatobj(mtmp);
994.  
995.  		if((!abstain || !rn2(10)) && 
996.  		   (!*in_rooms(mtmp->mx, mtmp->my, SHOPBASE) || !rn2(25))) {
997.  		    if(likeobjs) mpickstuff(mtmp, practical);
998.  		    if(likemagic) mpickstuff(mtmp, magical);
999.  		    if(likerock || likegems) mpickgems(mtmp);
1000. #ifdef MUSE
1001. 		    if(uses_items) mpickstuff(mtmp, (char *)0);
1002. #endif
1003. 		}
1004. 
1005. 		if(mtmp->minvis) {
1006. 		    newsym(mtmp->mx, mtmp->my);
1007. 		    if (mtmp->wormno) see_wsegs(mtmp);
1008. 		}
1009. 	    }
1010. 
1011. 	    if(hides_under(ptr)) {
1012. 		mtmp->mundetected = OBJ_AT(mtmp->mx, mtmp->my);
1013. 		newsym(mtmp->mx, mtmp->my);
1014. 	    }
1015. 	}
1016. 	return(mmoved);
1017. }
1018. 
1019. #endif /* OVL0 */
1020. #ifdef OVL2
1021. 
1022. boolean
1023. closed_door(x, y)
1024. register int x, y;
1025. {
1026. 	return(IS_DOOR(levl[x][y].typ) &&
1027. 			(levl[x][y].doormask & (D_LOCKED | D_CLOSED)));
1028. }
1029. 
1030. boolean
1031. accessible(x, y)
1032. register int x, y;
1033. {
1034. 	return(ACCESSIBLE(levl[x][y].typ) && !closed_door(x, y));
1035. }
1036. 
1037. #endif /* OVL2 */
1038. #ifdef OVL0
1039. 
1040. void
1041. set_apparxy(mtmp)		/* where does mtmp think you are standing? */
1042. 	register struct monst *mtmp;
1043. {
1044. #define notseen (Invis && !perceives(mtmp->data))
1045. /*	add cases as required.  eg. Displacement ... */
1046. 	register int disp = (Underwater ? 3 : notseen ? 1 : Displaced ? 2 : 0);
1047. 
1048. /* 	without something like the following, invis. and displ. are too */
1049. /*	powerful. */
1050. 	register boolean gotu =
1051. 		(notseen ? !rn2(3) : Displaced ? !rn2(4) : FALSE);
1052. 
1053. /*	Monsters which know where you are don't suddenly forget, if you
1054. 	didn't move away. */
1055. 	if (mtmp->mux==u.ux && mtmp->muy==u.uy) gotu = 1;
1056. 
1057. /* 	your dog follows your smell */
1058. 	if(!disp || mtmp->mtame || gotu ||
1059. /* 	Monsters touching you know where you are */
1060. 	   mtmp == u.ustuck ||
1061. /*	If invisible but not displaced, staying around gets you 'discovered' */
1062. 	    (!Displaced && u.dx == 0 && u.dy == 0)) {
1063. 		mtmp->mux = u.ux;
1064. 		mtmp->muy = u.uy;
1065. 	}
1066. 	else do {
1067. 		mtmp->mux = u.ux - disp + rn2(2*disp+1);
1068. 		mtmp->muy = u.uy - disp + rn2(2*disp+1);
1069. 	} while((mtmp->mux != u.ux || mtmp->muy != u.uy) &&
1070. 	        ( (!passes_walls(mtmp->data) &&
1071. 		      (!ACCESSIBLE(levl[mtmp->mux][mtmp->muy].typ) ||
1072. 		       (closed_door(mtmp->mux, mtmp->muy) &&
1073. 			!amorphous(mtmp->data)
1074. 		       )
1075. 		      )
1076. 		  ) ||
1077. 		  (disp==1 && mtmp->mux == mtmp->mx && mtmp->muy == mtmp->my)
1078. 	        )
1079. 	       );
1080. }
1081. 
1082. #endif /* OVL0 */
1083. 
1084. /*monmove.c*/