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Source:NetHack 3.4.0/dogmove.c

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Below is the full text to dogmove.c from the source code of NetHack 3.4.0. To link to a particular line, write [[NetHack 3.4.0/dogmove.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: @(#)dogmove.c	3.4	2002/03/09	*/
2.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    
5.    #include "hack.h"
6.    
7.    #include "mfndpos.h"
8.    #include "edog.h"
9.    
10.   extern boolean notonhead;
11.   
12.   #ifdef OVL0
13.   
14.   STATIC_DCL boolean FDECL(dog_hunger,(struct monst *,struct edog *));
15.   STATIC_DCL int FDECL(dog_invent,(struct monst *,struct edog *,int));
16.   STATIC_DCL int FDECL(dog_goal,(struct monst *,struct edog *,int,int,int));
17.   
18.   STATIC_DCL struct obj *FDECL(DROPPABLES, (struct monst *));
19.   STATIC_DCL boolean FDECL(can_reach_food,(struct monst *,XCHAR_P,XCHAR_P,XCHAR_P,
20.       XCHAR_P));
21.   
22.   STATIC_OVL struct obj *
23.   DROPPABLES(mon)
24.   register struct monst *mon;
25.   {
26.   	register struct obj *obj;
27.   	struct obj *wep = MON_WEP(mon);
28.   	boolean item1 = FALSE, item2 = FALSE;
29.   
30.   	if (is_animal(mon->data) || mindless(mon->data))
31.   		item1 = item2 = TRUE;
32.   	if (!tunnels(mon->data) || !needspick(mon->data))
33.   		item1 = TRUE;
34.   	for(obj = mon->minvent; obj; obj = obj->nobj) {
35.   		if (!item1 && is_pick(obj) && (obj->otyp != DWARVISH_MATTOCK
36.   						|| !which_armor(mon, W_ARMS))) {
37.   			item1 = TRUE;
38.   			continue;
39.   		}
40.   		if (!item2 && obj->otyp == UNICORN_HORN && !obj->cursed) {
41.   			item2 = TRUE;
42.   			continue;
43.   		}
44.   		if (!obj->owornmask && obj != wep) return obj;
45.   	}
46.   	return (struct obj *)0;
47.   }
48.   
49.   static NEARDATA const char nofetch[] = { BALL_CLASS, CHAIN_CLASS, ROCK_CLASS, 0 };
50.   
51.   #endif /* OVL0 */
52.   
53.   STATIC_OVL boolean FDECL(cursed_object_at, (int, int));
54.   
55.   STATIC_VAR xchar gtyp, gx, gy;	/* type and position of dog's current goal */
56.   
57.   STATIC_PTR void FDECL(wantdoor, (int, int, genericptr_t));
58.   
59.   #ifdef OVLB
60.   STATIC_OVL boolean
61.   cursed_object_at(x, y)
62.   int x, y;
63.   {
64.   	struct obj *otmp;
65.   
66.   	for(otmp = level.objects[x][y]; otmp; otmp = otmp->nexthere)
67.   		if (otmp->cursed) return TRUE;
68.   	return FALSE;
69.   }
70.   
71.   int
72.   dog_nutrition(mtmp, obj)
73.   struct monst *mtmp;
74.   struct obj *obj;
75.   {
76.   	int nutrit;
77.   
78.   	/*
79.   	 * It is arbitrary that the pet takes the same length of time to eat
80.   	 * as a human, but gets more nutritional value.
81.   	 */
82.   	if (obj->oclass == FOOD_CLASS) {
83.   	    if(obj->otyp == CORPSE) {
84.   		mtmp->meating = 3 + (mons[obj->corpsenm].cwt >> 6);
85.   		nutrit = mons[obj->corpsenm].cnutrit;
86.   	    } else {
87.   		mtmp->meating = objects[obj->otyp].oc_delay;
88.   		nutrit = objects[obj->otyp].oc_nutrition;
89.   	    }
90.   	    switch(mtmp->data->msize) {
91.   		case MZ_TINY: nutrit *= 8; break;
92.   		case MZ_SMALL: nutrit *= 6; break;
93.   		default:
94.   		case MZ_MEDIUM: nutrit *= 5; break;
95.   		case MZ_LARGE: nutrit *= 4; break;
96.   		case MZ_HUGE: nutrit *= 3; break;
97.   		case MZ_GIGANTIC: nutrit *= 2; break;
98.   	    }
99.   	    if(obj->oeaten) {
100.  		mtmp->meating = eaten_stat(mtmp->meating, obj);
101.  		nutrit = eaten_stat(nutrit, obj);
102.  	    }
103.  	} else if (obj->oclass == GOLD_CLASS) {
104.  	    mtmp->meating = (int)(obj->quan/2000) + 1;
105.  	    if (mtmp->meating < 0) mtmp->meating = 1;
106.  	    nutrit = (int)(obj->quan/20);
107.  	    if (nutrit < 0) nutrit = 0;
108.  	} else {
109.  	    /* Unusual pet such as gelatinous cube eating odd stuff.
110.  	     * meating made consistent with wild monsters in mon.c.
111.  	     * nutrit made consistent with polymorphed player nutrit in
112.  	     * eat.c.  (This also applies to pets eating gold.)
113.  	     */
114.  	    mtmp->meating = obj->owt/20 + 1;
115.  	    nutrit = 5*objects[obj->otyp].oc_nutrition;
116.  	}
117.  	return nutrit;
118.  }
119.  
120.  /* returns 2 if pet dies, otherwise 1 */
121.  int
122.  dog_eat(mtmp, obj, x, y, devour)
123.  register struct monst *mtmp;
124.  register struct obj * obj;
125.  int x, y;
126.  boolean devour;
127.  {
128.  	register struct edog *edog = EDOG(mtmp);
129.  	boolean poly = FALSE, grow = FALSE, heal = FALSE;
130.  	int nutrit;
131.  
132.  	if(edog->hungrytime < monstermoves)
133.  	    edog->hungrytime = monstermoves;
134.  	nutrit = dog_nutrition(mtmp, obj);
135.  	poly = polyfodder(obj);
136.  	grow = mlevelgain(obj);
137.  	heal = mhealup(obj);
138.  	if (devour) {
139.  	    if (mtmp->meating > 1) mtmp->meating /= 2;
140.  	    if (nutrit > 1) nutrit = (nutrit * 3) / 4;
141.  	}
142.  	edog->hungrytime += nutrit;
143.  	mtmp->mconf = 0;
144.  	if (edog->mhpmax_penalty) {
145.  	    /* no longer starving */
146.  	    mtmp->mhpmax += edog->mhpmax_penalty;
147.  	    edog->mhpmax_penalty = 0;
148.  	}
149.  	if (mtmp->mflee && mtmp->mfleetim > 1) mtmp->mfleetim /= 2;
150.  	if (mtmp->mtame < 20) mtmp->mtame++;
151.  	if (x != mtmp->mx || y != mtmp->my) {	/* moved & ate on same turn */
152.  	    newsym(x, y);
153.  	    newsym(mtmp->mx, mtmp->my);
154.  	}
155.  	if (is_pool(x, y) && !Underwater) {
156.  	    /* Don't print obj */
157.  	    /* TODO: Reveal presence of sea monster (especially sharks) */
158.  	} else
159.  	/* hack: observe the action if either new or old location is in view */
160.  	if (cansee(x, y) || cansee(mtmp->mx, mtmp->my))
161.  	    pline("%s %s %s.", noit_Monnam(mtmp),
162.  		  devour ? "devours" : "eats",
163.  		  (obj->oclass == FOOD_CLASS) ?
164.  			singular(obj, doname) : doname(obj));
165.  	/* It's a reward if it's DOGFOOD and the player dropped/threw it. */
166.  	/* We know the player had it if invlet is set -dlc */
167.  	if(dogfood(mtmp,obj) == DOGFOOD && obj->invlet)
168.  #ifdef LINT
169.  	    edog->apport = 0;
170.  #else
171.  	    edog->apport += (int)(200L/
172.  		((long)edog->dropdist + monstermoves - edog->droptime));
173.  #endif
174.  	if (mtmp->data == &mons[PM_RUST_MONSTER] && obj->oerodeproof) {
175.  	    /* The object's rustproofing is gone now */
176.  	    obj->oerodeproof = 0;
177.  	    mtmp->mstun = 1;
178.  	    if (canseemon(mtmp) && flags.verbose) {
179.  		pline("%s spits %s out in disgust!",
180.  		      Monnam(mtmp), distant_name(obj,doname));
181.  	    }
182.  	} else if (obj == uball) {
183.  	    unpunish();
184.  	    delobj(obj);
185.  	} else if (obj == uchain)
186.  	    unpunish();
187.  	else if (obj->quan > 1L && obj->oclass == FOOD_CLASS) {
188.  	    obj->quan--;
189.  	    obj->owt = weight(obj);
190.  	} else
191.  	    delobj(obj);
192.  
193.  	if (poly) {
194.  	    char oldpet[BUFSZ];
195.  #ifdef STEED
196.  	    long mw = mtmp->misc_worn_check;
197.  
198.  	    mtmp->misc_worn_check &= ~W_SADDLE;
199.  #endif
200.  	    Strcpy(oldpet, Monnam(mtmp));
201.  #ifdef STEED
202.  	    mtmp->misc_worn_check = mw;
203.  #endif
204.  	    if (newcham(mtmp, (struct permonst *)0, FALSE) &&
205.  			cansee(mtmp->mx, mtmp->my)) {
206.  		uchar save_mnamelth = mtmp->mnamelth;
207.  		mtmp->mnamelth = 0;
208.  		pline("%s turns into %s!", oldpet, a_monnam(mtmp));
209.  		mtmp->mnamelth = save_mnamelth;
210.  	    }
211.  	}
212.  	/* limit "instant" growth to prevent potential abuse */
213.  	if (grow && (int) mtmp->m_lev < (int)mtmp->data->mlevel + 15) {
214.  	    if (!grow_up(mtmp, (struct monst *)0)) return 2;
215.  	}
216.  	if (heal) mtmp->mhp = mtmp->mhpmax;
217.  	return 1;
218.  }
219.  
220.  #endif /* OVLB */
221.  #ifdef OVL0
222.  
223.  /* hunger effects -- returns TRUE on starvation */
224.  STATIC_OVL boolean
225.  dog_hunger(mtmp, edog)
226.  register struct monst *mtmp;
227.  register struct edog *edog;
228.  {
229.  	if (monstermoves > edog->hungrytime + 500) {
230.  	    if (!carnivorous(mtmp->data) && !herbivorous(mtmp->data)) {
231.  		edog->hungrytime = monstermoves + 500;
232.  		/* but not too high; it might polymorph */
233.  	    } else if (!edog->mhpmax_penalty) {
234.  		/* starving pets are limited in healing */
235.  		int newmhpmax = mtmp->mhpmax / 3;
236.  		mtmp->mconf = 1;
237.  		edog->mhpmax_penalty = mtmp->mhpmax - newmhpmax;
238.  		mtmp->mhpmax = newmhpmax;
239.  		if (mtmp->mhp > mtmp->mhpmax)
240.  		    mtmp->mhp = mtmp->mhpmax;
241.  		if (mtmp->mhp < 1) goto dog_died;
242.  		if (cansee(mtmp->mx, mtmp->my))
243.  		    pline("%s is confused from hunger.", Monnam(mtmp));
244.  		else if (couldsee(mtmp->mx, mtmp->my))
245.  		    beg(mtmp);
246.  		else
247.  		    You_feel("worried about %s.", y_monnam(mtmp));
248.  		stop_occupation();
249.  	    } else if (monstermoves > edog->hungrytime + 750 || mtmp->mhp < 1) {
250.  	    dog_died:
251.  		if (mtmp->mleashed)
252.  		    Your("leash goes slack.");
253.  		else if (cansee(mtmp->mx, mtmp->my))
254.  		    pline("%s dies%s.", Monnam(mtmp),
255.  			    (mtmp->mhp >= 1) ? "" : " from hunger");
256.  		else
257.  		    You_feel("%s for a moment.",
258.  			Hallucination ? "bummed" : "sad");
259.  		mondied(mtmp);
260.  		return(TRUE);
261.  	    }
262.  	}
263.  	return(FALSE);
264.  }
265.  
266.  /* do something with object (drop, pick up, eat) at current position
267.   * returns 1 if object eaten (since that counts as dog's move), 2 if died
268.   */
269.  STATIC_OVL int
270.  dog_invent(mtmp, edog, udist)
271.  register struct monst *mtmp;
272.  register struct edog *edog;
273.  int udist;
274.  {
275.  	register int omx, omy;
276.  	struct obj *obj;
277.  
278.  	if (mtmp->msleeping || !mtmp->mcanmove) return(0);
279.  
280.  	omx = mtmp->mx;
281.  	omy = mtmp->my;
282.  
283.  	/* if we are carrying sth then we drop it (perhaps near @) */
284.  	/* Note: if apport == 1 then our behaviour is independent of udist */
285.  	/* Use udist+1 so steed won't cause divide by zero */
286.  #ifndef GOLDOBJ
287.  	if(DROPPABLES(mtmp) || mtmp->mgold) {
288.  #else
289.  	if(DROPPABLES(mtmp)) {
290.  #endif
291.  	    if (!rn2(udist+1) || !rn2(edog->apport))
292.  		if(rn2(10) < edog->apport){
293.  		    relobj(mtmp, (int)mtmp->minvis, TRUE);
294.  		    if(edog->apport > 1) edog->apport--;
295.  		    edog->dropdist = udist;		/* hpscdi!jon */
296.  		    edog->droptime = monstermoves;
297.  		}
298.  	} else {
299.  	    if((obj=level.objects[omx][omy]) && !index(nofetch,obj->oclass)
300.  #ifdef MAIL
301.  			&& obj->otyp != SCR_MAIL
302.  #endif
303.  									){
304.  		if (dogfood(mtmp, obj) <= CADAVER)
305.  		    return dog_eat(mtmp, obj, omx, omy, FALSE);
306.  
307.  		if(can_carry(mtmp, obj) && !obj->cursed &&
308.  			!is_pool(mtmp->mx,mtmp->my)) {
309.  		    if(rn2(20) < edog->apport+3) {
310.  			if (rn2(udist) || !rn2(edog->apport)) {
311.  			    if (cansee(omx, omy) && flags.verbose)
312.  				pline("%s picks up %s.", Monnam(mtmp),
313.  				    distant_name(obj, doname));
314.  			    obj_extract_self(obj);
315.  			    newsym(omx,omy);
316.  			    (void) mpickobj(mtmp,obj);
317.  			    if (attacktype(mtmp->data, AT_WEAP) &&
318.  					mtmp->weapon_check == NEED_WEAPON) {
319.  				mtmp->weapon_check = NEED_HTH_WEAPON;
320.  				(void) mon_wield_item(mtmp);
321.  			    }
322.  			    m_dowear(mtmp, FALSE);
323.  			}
324.  		    }
325.  		}
326.  	    }
327.  	}
328.  	return 0;
329.  }
330.  
331.  /* set dog's goal -- gtyp, gx, gy
332.   * returns -1/0/1 (dog's desire to approach player) or -2 (abort move)
333.   */
334.  STATIC_OVL int
335.  dog_goal(mtmp, edog, after, udist, whappr)
336.  register struct monst *mtmp;
337.  struct edog *edog;
338.  int after, udist, whappr;
339.  {
340.  	register int omx, omy;
341.  	boolean in_masters_sight;
342.  	register struct obj *obj;
343.  	xchar otyp;
344.  	int appr;
345.  
346.  
347.  #ifdef STEED
348.  	/* Steeds don't move on their own will */
349.  	if (mtmp == u.usteed)
350.  		return (-2);
351.  #endif
352.  
353.  	omx = mtmp->mx;
354.  	omy = mtmp->my;
355.  
356.  	in_masters_sight = couldsee(omx, omy);
357.  
358.  	if (!edog || mtmp->mleashed) {	/* he's not going anywhere... */
359.  	    gtyp = APPORT;
360.  	    gx = u.ux;
361.  	    gy = u.uy;
362.  	} else {
363.  #define DDIST(x,y) (dist2(x,y,omx,omy))
364.  #define SQSRCHRADIUS 5
365.  	    int min_x, max_x, min_y, max_y;
366.  	    register int nx, ny;
367.  
368.  	    gtyp = UNDEF;	/* no goal as yet */
369.  	    gx = gy = 0;	/* suppress 'used before set' message */
370.  
371.  	    if ((min_x = omx - SQSRCHRADIUS) < 0) min_x = 0;
372.  	    if ((max_x = omx + SQSRCHRADIUS) >= COLNO) max_x = COLNO - 1;
373.  	    if ((min_y = omy - SQSRCHRADIUS) < 0) min_y = 0;
374.  	    if ((max_y = omy + SQSRCHRADIUS) >= ROWNO) max_y = ROWNO - 1;
375.  
376.  	    /* nearby food is the first choice, then other objects */
377.  	    for (obj = fobj; obj; obj = obj->nobj) {
378.  		nx = obj->ox;
379.  		ny = obj->oy;
380.  		if (nx >= min_x && nx <= max_x && ny >= min_y && ny <= max_y) {
381.  		    otyp = dogfood(mtmp, obj);
382.  		    if (otyp > gtyp || otyp == UNDEF)
383.  			continue;
384.  		    if (cursed_object_at(nx, ny))
385.  			continue;
386.  		    if (otyp < MANFOOD &&
387.  			    can_reach_food(mtmp, mtmp->mx, mtmp->my, nx, ny)) {
388.  			if (otyp < gtyp || DDIST(nx,ny) < DDIST(gx,gy)) {
389.  			    gx = nx;
390.  			    gy = ny;
391.  			    gtyp = otyp;
392.  			}
393.  		    } else if(gtyp == UNDEF && in_masters_sight &&
394.  			      !mtmp->minvent &&
395.  			      (!levl[omx][omy].lit || levl[u.ux][u.uy].lit) &&
396.  			      (otyp == MANFOOD || m_cansee(mtmp, nx, ny)) &&
397.  			      edog->apport > rn2(8) &&
398.  			      can_carry(mtmp,obj)) {
399.  			gx = nx;
400.  			gy = ny;
401.  			gtyp = APPORT;
402.  		    }
403.  		}
404.  	    }
405.  	}
406.  
407.  	/* follow player if appropriate */
408.  	if (gtyp == UNDEF ||
409.  	    (gtyp != DOGFOOD && gtyp != APPORT && monstermoves < edog->hungrytime)) {
410.  		gx = u.ux;
411.  		gy = u.uy;
412.  		if (after && udist <= 4 && gx == u.ux && gy == u.uy)
413.  			return(-2);
414.  		appr = (udist >= 9) ? 1 : (mtmp->mflee) ? -1 : 0;
415.  		if (udist > 1) {
416.  			if (!IS_ROOM(levl[u.ux][u.uy].typ) || !rn2(4) ||
417.  			   whappr ||
418.  			   (mtmp->minvent && rn2(edog->apport)))
419.  				appr = 1;
420.  		}
421.  		/* if you have dog food it'll follow you more closely */
422.  		if (appr == 0) {
423.  			obj = invent;
424.  			while (obj) {
425.  				if(dogfood(mtmp, obj) == DOGFOOD) {
426.  					appr = 1;
427.  					break;
428.  				}
429.  				obj = obj->nobj;
430.  			}
431.  		}
432.  	} else
433.  	    appr = 1;	/* gtyp != UNDEF */
434.  	if(mtmp->mconf)
435.  	    appr = 0;
436.  
437.  #define FARAWAY (COLNO + 2)		/* position outside screen */
438.  	if (gx == u.ux && gy == u.uy && !in_masters_sight) {
439.  	    register coord *cp;
440.  
441.  	    cp = gettrack(omx,omy);
442.  	    if (cp) {
443.  		gx = cp->x;
444.  		gy = cp->y;
445.  		if(edog) edog->ogoal.x = 0;
446.  	    } else {
447.  		/* assume master hasn't moved far, and reuse previous goal */
448.  		if(edog && edog->ogoal.x &&
449.  		   ((edog->ogoal.x != omx) || (edog->ogoal.y != omy))) {
450.  		    gx = edog->ogoal.x;
451.  		    gy = edog->ogoal.y;
452.  		    edog->ogoal.x = 0;
453.  		} else {
454.  		    int fardist = FARAWAY * FARAWAY;
455.  		    gx = gy = FARAWAY; /* random */
456.  		    do_clear_area(omx, omy, 9, wantdoor,
457.  				  (genericptr_t)&fardist);
458.  
459.  		    /* here gx == FARAWAY e.g. when dog is in a vault */
460.  		    if (gx == FARAWAY || (gx == omx && gy == omy)) {
461.  			gx = u.ux;
462.  			gy = u.uy;
463.  		    } else if(edog) {
464.  			edog->ogoal.x = gx;
465.  			edog->ogoal.y = gy;
466.  		    }
467.  		}
468.  	    }
469.  	} else if(edog) {
470.  	    edog->ogoal.x = 0;
471.  	}
472.  	return appr;
473.  }
474.  
475.  /* return 0 (no move), 1 (move) or 2 (dead) */
476.  int
477.  dog_move(mtmp, after)
478.  register struct monst *mtmp;
479.  register int after;	/* this is extra fast monster movement */
480.  {
481.  	int omx, omy;		/* original mtmp position */
482.  	int appr, whappr, udist;
483.  	int i, j, k;
484.  	register struct edog *edog = EDOG(mtmp);
485.  	struct obj *obj = (struct obj *) 0;
486.  	xchar otyp;
487.  	boolean has_edog, cursemsg[9], do_eat = FALSE;
488.  	xchar nix, niy;		/* position mtmp is (considering) moving to */
489.  	register int nx, ny;	/* temporary coordinates */
490.  	xchar cnt, uncursedcnt, chcnt;
491.  	int chi = -1, nidist, ndist;
492.  	coord poss[9];
493.  	long info[9], allowflags;
494.  #define GDIST(x,y) (dist2(x,y,gx,gy))
495.  
496.  	/*
497.  	 * Tame Angels have isminion set and an ispriest structure instead of
498.  	 * an edog structure.  Fortunately, guardian Angels need not worry
499.  	 * about mundane things like eating and fetching objects, and can
500.  	 * spend all their energy defending the player.  (They are the only
501.  	 * monsters with other structures that can be tame.)
502.  	 */
503.  	has_edog = !mtmp->isminion;
504.  
505.  	omx = mtmp->mx;
506.  	omy = mtmp->my;
507.  	if (has_edog && dog_hunger(mtmp, edog)) return(2);	/* starved */
508.  
509.  	udist = distu(omx,omy);
510.  #ifdef STEED
511.  	/* Let steeds eat and maybe throw rider during Conflict */
512.  	if (mtmp == u.usteed) {
513.  	    if (Conflict && !resist(mtmp, RING_CLASS, 0, 0)) {
514.  		dismount_steed(DISMOUNT_THROWN);
515.  		return (1);
516.  	    }
517.  	    udist = 1;
518.  	} else
519.  #endif
520.  	/* maybe we tamed him while being swallowed --jgm */
521.  	if (!udist) return(0);
522.  
523.  	nix = omx;	/* set before newdogpos */
524.  	niy = omy;
525.  	cursemsg[0] = FALSE;	/* lint suppression */
526.  	info[0] = 0;		/* ditto */
527.  
528.  	if (has_edog) {
529.  	    j = dog_invent(mtmp, edog, udist);
530.  	    if (j == 2) return 2;		/* died */
531.  	    else if (j == 1) goto newdogpos;	/* eating something */
532.  
533.  	    whappr = (monstermoves - edog->whistletime < 5);
534.  	} else
535.  	    whappr = 0;
536.  
537.  	appr = dog_goal(mtmp, has_edog ? edog : (struct edog *)0,
538.  							after, udist, whappr);
539.  	if (appr == -2) return(0);
540.  
541.  	allowflags = ALLOW_M | ALLOW_TRAPS | ALLOW_SSM | ALLOW_SANCT;
542.  	if (passes_walls(mtmp->data)) allowflags |= (ALLOW_ROCK|ALLOW_WALL);
543.  	if (throws_rocks(mtmp->data)) allowflags |= ALLOW_ROCK;
544.  	if (Conflict && !resist(mtmp, RING_CLASS, 0, 0)) {
545.  	    allowflags |= ALLOW_U;
546.  	    if (!has_edog) {
547.  		coord mm;
548.  		/* Guardian angel refuses to be conflicted; rather,
549.  		 * it disappears, angrily, and sends in some nasties
550.  		 */
551.  		if (canspotmon(mtmp)) {
552.  		    pline("%s rebukes you, saying:", Monnam(mtmp));
553.  		    verbalize("Since you desire conflict, have some more!");
554.  		}
555.  		mongone(mtmp);
556.  		i = rnd(4);
557.  		while(i--) {
558.  		    mm.x = u.ux;
559.  		    mm.y = u.uy;
560.  		    if(enexto(&mm, mm.x, mm.y, &mons[PM_ANGEL]))
561.  			(void) mk_roamer(&mons[PM_ANGEL], u.ualign.type,
562.  					 mm.x, mm.y, FALSE);
563.  		}
564.  		return(2);
565.  
566.  	    }
567.  	}
568.  	if (!Conflict && !mtmp->mconf &&
569.  	    mtmp == u.ustuck && !sticks(youmonst.data)) {
570.  	    unstuck(mtmp);	/* swallowed case handled above */
571.  	    You("get released!");
572.  	}
573.  	if (!nohands(mtmp->data) && !verysmall(mtmp->data)) {
574.  		allowflags |= OPENDOOR;
575.  		if (m_carrying(mtmp, SKELETON_KEY)) allowflags |= BUSTDOOR;
576.  	}
577.  	if (is_giant(mtmp->data)) allowflags |= BUSTDOOR;
578.  	if (tunnels(mtmp->data) && (!needspick(mtmp->data) ||
579.  					m_carrying(mtmp, PICK_AXE) ||
580.  					m_carrying(mtmp, DWARVISH_MATTOCK)))
581.  		allowflags |= ALLOW_DIG;
582.  	cnt = mfndpos(mtmp, poss, info, allowflags);
583.  
584.  	/* Normally dogs don't step on cursed items, but if they have no
585.  	 * other choice they will.  This requires checking ahead of time
586.  	 * to see how many uncursed item squares are around.
587.  	 */
588.  	uncursedcnt = 0;
589.  	for (i = 0; i < cnt; i++) {
590.  		nx = poss[i].x; ny = poss[i].y;
591.  		if (MON_AT(nx,ny) && !(info[i] & ALLOW_M)) continue;
592.  		if (cursed_object_at(nx, ny)) continue;
593.  		uncursedcnt++;
594.  	}
595.  
596.  	chcnt = 0;
597.  	chi = -1;
598.  	nidist = GDIST(nix,niy);
599.  
600.  	for (i = 0; i < cnt; i++) {
601.  		nx = poss[i].x;
602.  		ny = poss[i].y;
603.  		cursemsg[i] = FALSE;
604.  
605.  		/* if leashed, we drag him along. */
606.  		if (mtmp->mleashed && distu(nx, ny) > 4) continue;
607.  
608.  		/* if a guardian, try to stay close by choice */
609.  		if (!has_edog &&
610.  		    (j = distu(nx, ny)) > 16 && j >= udist) continue;
611.  
612.  		if ((info[i] & ALLOW_M) && MON_AT(nx, ny)) {
613.  		    int mstatus;
614.  		    register struct monst *mtmp2 = m_at(nx,ny);
615.  
616.  		    if ((int)mtmp2->m_lev >= (int)mtmp->m_lev+2 ||
617.  			(mtmp2->data == &mons[PM_FLOATING_EYE] && rn2(10) &&
618.  			 mtmp->mcansee && haseyes(mtmp->data) && mtmp2->mcansee
619.  			 && (perceives(mtmp->data) || !mtmp2->minvis)) ||
620.  			(mtmp2->data==&mons[PM_GELATINOUS_CUBE] && rn2(10)) ||
621.  			(max_passive_dmg(mtmp2, mtmp) >= mtmp->mhp) ||
622.  			((mtmp->mhp*4 < mtmp->mhpmax
623.  			  || mtmp2->data->msound == MS_GUARDIAN
624.  			  || mtmp2->data->msound == MS_LEADER) &&
625.  			 mtmp2->mpeaceful && !Conflict) ||
626.  			   (touch_petrifies(mtmp2->data) &&
627.  				!resists_ston(mtmp)))
628.  			continue;
629.  
630.  		    if (after) return(0); /* hit only once each move */
631.  
632.  		    notonhead = 0;
633.  		    mstatus = mattackm(mtmp, mtmp2);
634.  
635.  		    /* aggressor (pet) died */
636.  		    if (mstatus & MM_AGR_DIED) return 2;
637.  
638.  		    if ((mstatus & MM_HIT) && !(mstatus & MM_DEF_DIED) &&
639.  			    rn2(4) && mtmp2->mlstmv != monstermoves &&
640.  			    !onscary(mtmp->mx, mtmp->my, mtmp2) &&
641.  			    /* monnear check needed: long worms hit on tail */
642.  			    monnear(mtmp2, mtmp->mx, mtmp->my)) {
643.  			mstatus = mattackm(mtmp2, mtmp);  /* return attack */
644.  			if (mstatus & MM_DEF_DIED) return 2;
645.  		    }
646.  
647.  		    return 0;
648.  		}
649.  
650.  		{   /* Dog avoids harmful traps, but perhaps it has to pass one
651.  		     * in order to follow player.  (Non-harmful traps do not
652.  		     * have ALLOW_TRAPS in info[].)  The dog only avoids the
653.  		     * trap if you've seen it, unlike enemies who avoid traps
654.  		     * if they've seen some trap of that type sometime in the
655.  		     * past.  (Neither behavior is really realistic.)
656.  		     */
657.  		    struct trap *trap;
658.  
659.  		    if ((info[i] & ALLOW_TRAPS) && (trap = t_at(nx,ny))) {
660.  			if (mtmp->mleashed) {
661.  			    if (flags.soundok) whimper(mtmp);
662.  			} else
663.  			    /* 1/40 chance of stepping on it anyway, in case
664.  			     * it has to pass one to follow the player...
665.  			     */
666.  			    if (trap->tseen && rn2(40)) continue;
667.  		    }
668.  		}
669.  
670.  		/* dog eschews cursed objects, but likes dog food */
671.  		/* (minion isn't interested; `cursemsg' stays FALSE) */
672.  		if (has_edog)
673.  		for (obj = level.objects[nx][ny]; obj; obj = obj->nexthere) {
674.  		    if (obj->cursed) cursemsg[i] = TRUE;
675.  		    else if ((otyp = dogfood(mtmp, obj)) < MANFOOD &&
676.  			     (otyp < ACCFOOD || edog->hungrytime <= monstermoves)) {
677.  			/* Note: our dog likes the food so much that he
678.  			 * might eat it even when it conceals a cursed object */
679.  			nix = nx;
680.  			niy = ny;
681.  			chi = i;
682.  			do_eat = TRUE;
683.  			cursemsg[i] = FALSE;	/* not reluctant */
684.  			goto newdogpos;
685.  		    }
686.  		}
687.  		/* didn't find something to eat; if we saw a cursed item and
688.  		   aren't being forced to walk on it, usually keep looking */
689.  		if (cursemsg[i] && !mtmp->mleashed && uncursedcnt > 0 &&
690.  		    rn2(13 * uncursedcnt)) continue;
691.  
692.  		/* lessen the chance of backtracking to previous position(s) */
693.  		k = has_edog ? uncursedcnt : cnt;
694.  		for (j = 0; j < MTSZ && j < k - 1; j++)
695.  			if (nx == mtmp->mtrack[j].x && ny == mtmp->mtrack[j].y)
696.  				if (rn2(MTSZ * (k - j))) goto nxti;
697.  
698.  		j = ((ndist = GDIST(nx,ny)) - nidist) * appr;
699.  		if ((j == 0 && !rn2(++chcnt)) || j < 0 ||
700.  			(j > 0 && !whappr &&
701.  				((omx == nix && omy == niy && !rn2(3))
702.  					|| !rn2(12))
703.  			)) {
704.  			nix = nx;
705.  			niy = ny;
706.  			nidist = ndist;
707.  			if(j < 0) chcnt = 0;
708.  			chi = i;
709.  		}
710.  	nxti:	;
711.  	}
712.  newdogpos:
713.  	if (nix != omx || niy != omy) {
714.  		struct obj *mw_tmp;
715.  
716.  		if (info[chi] & ALLOW_U) {
717.  			if (mtmp->mleashed) { /* play it safe */
718.  				pline("%s breaks loose of %s leash!",
719.  				      Monnam(mtmp), mhis(mtmp));
720.  				m_unleash(mtmp, FALSE);
721.  			}
722.  			(void) mattacku(mtmp);
723.  			return(0);
724.  		}
725.  		if (!m_in_out_region(mtmp, nix, niy))
726.  		    return 1;
727.  		if(IS_ROCK(levl[nix][niy].typ) && may_dig(nix,niy) &&
728.  		    mtmp->weapon_check != NO_WEAPON_WANTED &&
729.  		    tunnels(mtmp->data) && needspick(mtmp->data) &&
730.  			(!(mw_tmp = MON_WEP(mtmp)) || !is_pick(mw_tmp))) {
731.  		    mtmp->weapon_check = NEED_PICK_AXE;
732.  		    if (mon_wield_item(mtmp))
733.  			return 0;
734.  		}
735.  		/* insert a worm_move() if worms ever begin to eat things */
736.  		remove_monster(omx, omy);
737.  		place_monster(mtmp, nix, niy);
738.  		if (cursemsg[chi] && (cansee(omx,omy) || cansee(nix,niy)))
739.  			pline("%s moves only reluctantly.", Monnam(mtmp));
740.  		for (j=MTSZ-1; j>0; j--) mtmp->mtrack[j] = mtmp->mtrack[j-1];
741.  		mtmp->mtrack[0].x = omx;
742.  		mtmp->mtrack[0].y = omy;
743.  		/* We have to know if the pet's gonna do a combined eat and
744.  		 * move before moving it, but it can't eat until after being
745.  		 * moved.  Thus the do_eat flag.
746.  		 */
747.  		if (do_eat) {
748.  		    if (dog_eat(mtmp, obj, omx, omy, FALSE) == 2) return 2;
749.  		}
750.  	} else if (mtmp->mleashed && distu(omx, omy) > 4) {
751.  		/* an incredible kludge, but the only way to keep pooch near
752.  		 * after it spends time eating or in a trap, etc.
753.  		 */
754.  		coord cc;
755.  
756.  		nx = sgn(omx - u.ux);
757.  		ny = sgn(omy - u.uy);
758.  		cc.x = u.ux + nx;
759.  		cc.y = u.uy + ny;
760.  		if (goodpos(cc.x, cc.y, mtmp)) goto dognext;
761.  
762.  		i  = xytod(nx, ny);
763.  		for (j = (i + 7)%8; j < (i + 1)%8; j++) {
764.  			dtoxy(&cc, j);
765.  			if (goodpos(cc.x, cc.y, mtmp)) goto dognext;
766.  		}
767.  		for (j = (i + 6)%8; j < (i + 2)%8; j++) {
768.  			dtoxy(&cc, j);
769.  			if (goodpos(cc.x, cc.y, mtmp)) goto dognext;
770.  		}
771.  		cc.x = mtmp->mx;
772.  		cc.y = mtmp->my;
773.  dognext:
774.  		if (!m_in_out_region(mtmp, nix, niy))
775.  		  return 1;
776.  		remove_monster(mtmp->mx, mtmp->my);
777.  		place_monster(mtmp, cc.x, cc.y);
778.  		newsym(cc.x,cc.y);
779.  		set_apparxy(mtmp);
780.  	}
781.  	return(1);
782.  }
783.  
784.  /* Hack to prevent a dog from being endlessly stuck near a piece of food that
785.   * it can't reach, such as caught in a teleport scroll niche.  It recursively
786.   * checks to see if the squares inbetween are good.  The checking could be a
787.   * little smarter; a full check would probably be useful in m_move() too.
788.   * Since the maximum food distance is 5, this should never be more than 5 calls
789.   * deep.
790.   */
791.  STATIC_OVL  boolean
792.  can_reach_food(mon, mx, my, fx, fy)
793.  struct monst *mon;
794.  xchar mx, my, fx, fy;
795.  {
796.      int i, j;
797.      int dist;
798.  
799.      if (mx == fx && my == fy) return TRUE;
800.      if (!isok(mx, my)) return FALSE; /* should not happen */
801.      
802.      dist = dist2(mx, my, fx, fy);
803.      for(i=mx-1; i<=mx+1; i++) {
804.  	for(j=my-1; j<=my+1; j++) {
805.  	    if (!isok(i, j))
806.  		continue;
807.  	    if (dist2(i, j, fx, fy) >= dist)
808.  		continue;
809.  	    if (IS_ROCK(levl[i][j].typ) && !passes_walls(mon->data) &&
810.  				    (!may_dig(i,j) || !tunnels(mon->data)))
811.  		continue;
812.  	    if (IS_DOOR(levl[i][j].typ) &&
813.  				(levl[i][j].doormask & (D_CLOSED | D_LOCKED)))
814.  		continue;
815.  	    if (is_pool(i, j) && !is_swimmer(mon->data))
816.  		continue;
817.  	    if (is_lava(i, j) && !likes_lava(mon->data))
818.  		continue;
819.  	    if (sobj_at(BOULDER,i,j) && !throws_rocks(mon->data))
820.  		continue;
821.  	    if (can_reach_food(mon, i, j, fx, fy))
822.  		return TRUE;
823.  	}
824.      }
825.      return FALSE;
826.  }
827.  
828.  #endif /* OVL0 */
829.  #ifdef OVLB
830.  
831.  /*ARGSUSED*/	/* do_clear_area client */
832.  STATIC_PTR void
833.  wantdoor(x, y, distance)
834.  int x, y;
835.  genericptr_t distance;
836.  {
837.      int ndist;
838.  
839.      if (*(int*)distance > (ndist = distu(x, y))) {
840.  	gx = x;
841.  	gy = y;
842.  	*(int*)distance = ndist;
843.      }
844.  }
845.  
846.  #endif /* OVLB */
847.  
848.  /*dogmove.c*/

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