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Source:NetHack 3.3.0/dogmove.c

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Below is the full text to dogmove.c from the source code of NetHack 3.3.0. To link to a particular line, write [[NetHack 3.3.0/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	3.3	97/05/25	*/
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.   
20.   STATIC_OVL struct obj *
21.   DROPPABLES(mon)
22.   register struct monst *mon;
23.   {
24.   	register struct obj *obj;
25.   	struct obj *wep = MON_WEP(mon);
26.   	boolean item1 = FALSE, item2 = FALSE;
27.   
28.   	if (is_animal(mon->data) || mindless(mon->data))
29.   		item1 = item2 = TRUE;
30.   	if (!tunnels(mon->data) || !needspick(mon->data))
31.   		item1 = TRUE;
32.   	for(obj = mon->minvent; obj; obj = obj->nobj) {
33.   		if (!item1 && is_pick(obj)) {
34.   			item1 = TRUE;
35.   			continue;
36.   		}
37.   		if (!item2 && obj->otyp == UNICORN_HORN && !obj->cursed) {
38.   			item2 = TRUE;
39.   			continue;
40.   		}
41.   		if (!obj->owornmask && obj != wep) return obj;
42.   	}
43.   	return (struct obj *)0;
44.   }
45.   
46.   static NEARDATA const char nofetch[] = { BALL_CLASS, CHAIN_CLASS, ROCK_CLASS, 0 };
47.   
48.   #endif /* OVL0 */
49.   
50.   STATIC_OVL boolean FDECL(cursed_object_at, (int, int));
51.   
52.   STATIC_VAR xchar gtyp, gx, gy;	/* type and position of dog's current goal */
53.   
54.   STATIC_PTR void FDECL(wantdoor, (int, int, genericptr_t));
55.   
56.   #ifdef OVLB
57.   STATIC_OVL boolean
58.   cursed_object_at(x, y)
59.   int x, y;
60.   {
61.   	struct obj *otmp;
62.   
63.   	for(otmp = level.objects[x][y]; otmp; otmp = otmp->nexthere)
64.   		if (otmp->cursed) return TRUE;
65.   	return FALSE;
66.   }
67.   
68.   int
69.   dog_nutrition(mtmp, obj)
70.   struct monst *mtmp;
71.   struct obj *obj;
72.   {
73.   	int nutrit;
74.   
75.   	/*
76.   	 * It is arbitrary that the pet takes the same length of time to eat
77.   	 * as a human, but gets more nutritional value.
78.   	 */
79.   	if (obj->oclass == FOOD_CLASS) {
80.   	    if(obj->otyp == CORPSE) {
81.   		mtmp->meating = 3 + (mons[obj->corpsenm].cwt >> 6);
82.   		nutrit = mons[obj->corpsenm].cnutrit;
83.   	    } else {
84.   		mtmp->meating = objects[obj->otyp].oc_delay;
85.   		nutrit = objects[obj->otyp].oc_nutrition;
86.   	    }
87.   	    switch(mtmp->data->msize) {
88.   		case MZ_TINY: nutrit *= 8; break;
89.   		case MZ_SMALL: nutrit *= 6; break;
90.   		default:
91.   		case MZ_MEDIUM: nutrit *= 5; break;
92.   		case MZ_LARGE: nutrit *= 4; break;
93.   		case MZ_HUGE: nutrit *= 3; break;
94.   		case MZ_GIGANTIC: nutrit *= 2; break;
95.   	    }
96.   	    if(obj->oeaten) {
97.   		mtmp->meating = eaten_stat(mtmp->meating, obj);
98.   		nutrit = eaten_stat(nutrit, obj);
99.   	    }
100.  	} else if (obj->oclass == GOLD_CLASS) {
101.  	    mtmp->meating = (int)(obj->quan/2000) + 1;
102.  	    if (mtmp->meating < 0) mtmp->meating = 1;
103.  	    nutrit = (int)(obj->quan/20);
104.  	    if (nutrit < 0) nutrit = 0;
105.  	} else {
106.  	    /* Unusual pet such as gelatinous cube eating odd stuff.
107.  	     * meating made consistent with wild monsters in mon.c.
108.  	     * nutrit made consistent with polymorphed player nutrit in
109.  	     * eat.c.  (This also applies to pets eating gold.)
110.  	     */
111.  	    mtmp->meating = obj->owt/20 + 1;
112.  	    nutrit = 5*objects[obj->otyp].oc_nutrition;
113.  	}
114.  	return nutrit;
115.  }
116.  
117.  /* returns 2 if pet dies, otherwise 1 */
118.  int
119.  dog_eat(mtmp, obj, x, y, devour)
120.  register struct monst *mtmp;
121.  register struct obj * obj;
122.  int x, y;
123.  boolean devour;
124.  {
125.  	register struct edog *edog = EDOG(mtmp);
126.  	boolean poly = FALSE, grow = FALSE, heal = FALSE;
127.  	int nutrit;
128.  
129.  	if(edog->hungrytime < monstermoves)
130.  	    edog->hungrytime = monstermoves;
131.  	nutrit = dog_nutrition(mtmp, obj);
132.  	poly = polyfodder(obj);
133.  	grow = mlevelgain(obj);
134.  	heal = mhealup(obj);
135.  	if (devour) {
136.  	    if (mtmp->meating > 1) mtmp->meating /= 2;
137.  	    if (nutrit > 1) nutrit = (nutrit * 3) / 4;
138.  	}
139.  	edog->hungrytime += nutrit;
140.  	mtmp->mconf = 0;
141.  	if (mtmp->mflee && mtmp->mfleetim > 1) mtmp->mfleetim /= 2;
142.  	if (mtmp->mtame < 20) mtmp->mtame++;
143.  	if (x != mtmp->mx || y != mtmp->my) {	/* moved & ate on same turn */
144.  	    newsym(x, y);
145.  	    newsym(mtmp->mx, mtmp->my);
146.  	}
147.  	if (is_pool(x, y) && !Underwater) {
148.  	    /* Don't print obj */
149.  	    /* TODO: Reveal presence of sea monster (especially sharks) */
150.  	} else
151.  	/* hack: observe the action if either new or old location is in view */
152.  	if (cansee(x, y) || cansee(mtmp->mx, mtmp->my))
153.  	    pline("%s %s %s.", Monnam(mtmp),
154.  		  devour ? "devours" : "eats",
155.  		  (obj->oclass == FOOD_CLASS) ?
156.  			singular(obj, doname) : doname(obj));
157.  	/* It's a reward if it's DOGFOOD and the player dropped/threw it. */
158.  	/* We know the player had it if invlet is set -dlc */
159.  	if(dogfood(mtmp,obj) == DOGFOOD && obj->invlet)
160.  #ifdef LINT
161.  	    edog->apport = 0;
162.  #else
163.  	    edog->apport += (int)(200L/
164.  		((long)edog->dropdist + monstermoves - edog->droptime));
165.  #endif
166.  	if (mtmp->data == &mons[PM_RUST_MONSTER] && obj->oerodeproof) {
167.  	    /* The object's rustproofing is gone now */
168.  	    obj->oerodeproof = 0;
169.  	    mtmp->mstun = 1;
170.  	    if (canseemon(mtmp) && flags.verbose) {
171.  		pline("%s spits %s out in disgust!",
172.  		      Monnam(mtmp), distant_name(obj,doname));
173.  	    }
174.  	} else if (obj == uball) {
175.  	    unpunish();
176.  	    delobj(obj);
177.  	} else if (obj == uchain)
178.  	    unpunish();
179.  	else if (obj->quan > 1L && obj->oclass == FOOD_CLASS)
180.  	    obj->quan--;
181.  	else
182.  	    delobj(obj);
183.  
184.  	if (poly) {
185.  	    char oldpet[BUFSZ];
186.  #ifdef STEED
187.  	    long mw = mtmp->misc_worn_check;
188.  
189.  	    mtmp->misc_worn_check &= ~W_SADDLE;
190.  #endif
191.  	    Strcpy(oldpet, Monnam(mtmp));
192.  #ifdef STEED
193.  	    mtmp->misc_worn_check = mw;
194.  #endif
195.  	    if (newcham(mtmp, (struct permonst *)0) &&
196.  			cansee(mtmp->mx, mtmp->my)) {
197.  		uchar save_mnamelth = mtmp->mnamelth;
198.  		mtmp->mnamelth = 0;
199.  		pline("%s turns into %s!", oldpet, a_monnam(mtmp));
200.  		mtmp->mnamelth = save_mnamelth;
201.  	    }
202.  	}
203.  	/* limit "instant" growth to prevent potential abuse */
204.  	if (grow && (int) mtmp->m_lev < (int)mtmp->data->mlevel + 15) {
205.  	    if (!grow_up(mtmp, (struct monst *)0)) return 2;
206.  	}
207.  	if (heal) mtmp->mhp = mtmp->mhpmax;
208.  	return 1;
209.  }
210.  
211.  #endif /* OVLB */
212.  #ifdef OVL0
213.  
214.  /* hunger effects -- returns TRUE on starvation */
215.  STATIC_OVL boolean
216.  dog_hunger(mtmp, edog)
217.  register struct monst *mtmp;
218.  register struct edog *edog;
219.  {
220.  	if (monstermoves > edog->hungrytime + 500) {
221.  	    if (!carnivorous(mtmp->data) && !herbivorous(mtmp->data)) {
222.  		edog->hungrytime = monstermoves + 500;
223.  		/* but not too high; it might polymorph */
224.  	    } else if (!mtmp->mconf) {
225.  		mtmp->mconf = 1;
226.  		mtmp->mhpmax /= 3;
227.  		if (mtmp->mhp > mtmp->mhpmax)
228.  		    mtmp->mhp = mtmp->mhpmax;
229.  		if (mtmp->mhp < 1) goto dog_died;
230.  		if (cansee(mtmp->mx, mtmp->my))
231.  		    pline("%s is confused from hunger.", Monnam(mtmp));
232.  		else if (couldsee(mtmp->mx, mtmp->my))
233.  		    beg(mtmp);
234.  		else
235.  		    You_feel("worried about %s.", y_monnam(mtmp));
236.  	    } else if (monstermoves > edog->hungrytime + 750 || mtmp->mhp < 1) {
237.  	    dog_died:
238.  		if (mtmp->mleashed)
239.  		    Your("leash goes slack.");
240.  		else if (cansee(mtmp->mx, mtmp->my))
241.  		    pline("%s dies%s.", Monnam(mtmp),
242.  			    (mtmp->mhp >= 1) ? "" : " from hunger");
243.  		else
244.  		    You_feel("%s for a moment.",
245.  			Hallucination ? "bummed" : "sad");
246.  		mondied(mtmp);
247.  		return(TRUE);
248.  	    }
249.  	}
250.  	return(FALSE);
251.  }
252.  
253.  /* do something with object (drop, pick up, eat) at current position
254.   * returns 1 if object eaten (since that counts as dog's move), 2 if died
255.   */
256.  STATIC_OVL int
257.  dog_invent(mtmp, edog, udist)
258.  register struct monst *mtmp;
259.  register struct edog *edog;
260.  int udist;
261.  {
262.  	register int omx, omy;
263.  	struct obj *obj;
264.  
265.  	if (mtmp->msleeping || !mtmp->mcanmove) return(0);
266.  
267.  	omx = mtmp->mx;
268.  	omy = mtmp->my;
269.  
270.  	/* if we are carrying sth then we drop it (perhaps near @) */
271.  	/* Note: if apport == 1 then our behaviour is independent of udist */
272.  	/* Use udist+1 so steed won't cause divide by zero */
273.  	if(DROPPABLES(mtmp) || mtmp->mgold) {
274.  	    if (!rn2(udist+1) || !rn2(edog->apport))
275.  		if(rn2(10) < edog->apport){
276.  		    relobj(mtmp, (int)mtmp->minvis, TRUE);
277.  		    if(edog->apport > 1) edog->apport--;
278.  		    edog->dropdist = udist;		/* hpscdi!jon */
279.  		    edog->droptime = monstermoves;
280.  		}
281.  	} else {
282.  	    if((obj=level.objects[omx][omy]) && !index(nofetch,obj->oclass)
283.  #ifdef MAIL
284.  			&& obj->otyp != SCR_MAIL
285.  #endif
286.  									){
287.  		if (dogfood(mtmp, obj) <= CADAVER)
288.  		    return dog_eat(mtmp, obj, omx, omy, FALSE);
289.  
290.  		if(can_carry(mtmp, obj) && !obj->cursed)
291.  		    if(rn2(20) < edog->apport+3)
292.  			if (rn2(udist) || !rn2(edog->apport)) {
293.  			    if (cansee(omx, omy) && flags.verbose)
294.  				pline("%s picks up %s.", Monnam(mtmp),
295.  				    distant_name(obj, doname));
296.  			    obj_extract_self(obj);
297.  			    newsym(omx,omy);
298.  			    mpickobj(mtmp,obj);
299.  			    if (attacktype(mtmp->data, AT_WEAP)) {
300.  				mtmp->weapon_check = NEED_HTH_WEAPON;
301.  				(void) mon_wield_item(mtmp);
302.  			    }
303.  			}
304.  	    }
305.  	}
306.  	return 0;
307.  }
308.  
309.  /* set dog's goal -- gtyp, gx, gy
310.   * returns -1/0/1 (dog's desire to approach player) or -2 (abort move)
311.   */
312.  STATIC_OVL int
313.  dog_goal(mtmp, edog, after, udist, whappr)
314.  register struct monst *mtmp;
315.  struct edog *edog;
316.  int after, udist, whappr;
317.  {
318.  	register int omx, omy;
319.  	boolean in_masters_sight;
320.  	register struct obj *obj;
321.  	xchar otyp;
322.  	int appr;
323.  
324.  
325.  #ifdef STEED
326.  	/* Steeds don't move on their own will */
327.  	if (mtmp == u.usteed)
328.  		return (-2);
329.  #endif
330.  
331.  	omx = mtmp->mx;
332.  	omy = mtmp->my;
333.  
334.  	in_masters_sight = couldsee(omx, omy);
335.  
336.  	if (!edog || mtmp->mleashed) {	/* he's not going anywhere... */
337.  	    gtyp = APPORT;
338.  	    gx = u.ux;
339.  	    gy = u.uy;
340.  	} else {
341.  #define DDIST(x,y) (dist2(x,y,omx,omy))
342.  #define SQSRCHRADIUS 5
343.  	    int min_x, max_x, min_y, max_y;
344.  	    register int nx, ny;
345.  
346.  	    gtyp = UNDEF;	/* no goal as yet */
347.  	    gx = gy = 0;	/* suppress 'used before set' message */
348.  
349.  	    if ((min_x = omx - SQSRCHRADIUS) < 0) min_x = 0;
350.  	    if ((max_x = omx + SQSRCHRADIUS) >= COLNO) max_x = COLNO - 1;
351.  	    if ((min_y = omy - SQSRCHRADIUS) < 0) min_y = 0;
352.  	    if ((max_y = omy + SQSRCHRADIUS) >= ROWNO) max_y = ROWNO - 1;
353.  
354.  	    /* nearby food is the first choice, then other objects */
355.  	    for (obj = fobj; obj; obj = obj->nobj) {
356.  		nx = obj->ox;
357.  		ny = obj->oy;
358.  		if (nx >= min_x && nx <= max_x && ny >= min_y && ny <= max_y) {
359.  		    otyp = dogfood(mtmp, obj);
360.  		    if (otyp > gtyp || otyp == UNDEF)
361.  			continue;
362.  		    if (cursed_object_at(nx, ny))
363.  			continue;
364.  		    if (otyp < MANFOOD) {
365.  			if (otyp < gtyp || DDIST(nx,ny) < DDIST(gx,gy)) {
366.  			    gx = nx;
367.  			    gy = ny;
368.  			    gtyp = otyp;
369.  			}
370.  		    } else if(gtyp == UNDEF && in_masters_sight &&
371.  			      !mtmp->minvent &&
372.  			      (!levl[omx][omy].lit || levl[u.ux][u.uy].lit) &&
373.  			      (otyp == MANFOOD || m_cansee(mtmp, nx, ny)) &&
374.  			      edog->apport > rn2(8) &&
375.  			      can_carry(mtmp,obj)) {
376.  			gx = nx;
377.  			gy = ny;
378.  			gtyp = APPORT;
379.  		    }
380.  		}
381.  	    }
382.  	}
383.  
384.  	/* follow player if appropriate */
385.  	if (gtyp == UNDEF ||
386.  	    (gtyp != DOGFOOD && gtyp != APPORT && monstermoves < edog->hungrytime)) {
387.  		gx = u.ux;
388.  		gy = u.uy;
389.  		if (after && udist <= 4 && gx == u.ux && gy == u.uy)
390.  			return(-2);
391.  		appr = (udist >= 9) ? 1 : (mtmp->mflee) ? -1 : 0;
392.  		if (udist > 1) {
393.  			if (!IS_ROOM(levl[u.ux][u.uy].typ) || !rn2(4) ||
394.  			   whappr ||
395.  			   (mtmp->minvent && rn2(edog->apport)))
396.  				appr = 1;
397.  		}
398.  		/* if you have dog food it'll follow you more closely */
399.  		if (appr == 0) {
400.  			obj = invent;
401.  			while (obj) {
402.  				if(dogfood(mtmp, obj) == DOGFOOD) {
403.  					appr = 1;
404.  					break;
405.  				}
406.  				obj = obj->nobj;
407.  			}
408.  		}
409.  	} else
410.  	    appr = 1;	/* gtyp != UNDEF */
411.  	if(mtmp->mconf)
412.  	    appr = 0;
413.  
414.  #define FARAWAY (COLNO + 2)		/* position outside screen */
415.  	if (gx == u.ux && gy == u.uy && !in_masters_sight) {
416.  	    register coord *cp;
417.  
418.  	    cp = gettrack(omx,omy);
419.  	    if (cp) {
420.  		gx = cp->x;
421.  		gy = cp->y;
422.  		if(edog) edog->ogoal.x = 0;
423.  	    } else {
424.  		/* assume master hasn't moved far, and reuse previous goal */
425.  		if(edog && edog->ogoal.x &&
426.  		   ((edog->ogoal.x != omx) || (edog->ogoal.y != omy))) {
427.  		    gx = edog->ogoal.x;
428.  		    gy = edog->ogoal.y;
429.  		    edog->ogoal.x = 0;
430.  		} else {
431.  		    int fardist = FARAWAY * FARAWAY;
432.  		    gx = gy = FARAWAY; /* random */
433.  		    do_clear_area(omx, omy, 9, wantdoor,
434.  				  (genericptr_t)&fardist);
435.  
436.  		    /* here gx == FARAWAY e.g. when dog is in a vault */
437.  		    if (gx == FARAWAY || (gx == omx && gy == omy)) {
438.  			gx = u.ux;
439.  			gy = u.uy;
440.  		    } else if(edog) {
441.  			edog->ogoal.x = gx;
442.  			edog->ogoal.y = gy;
443.  		    }
444.  		}
445.  	    }
446.  	} else if(edog) {
447.  	    edog->ogoal.x = 0;
448.  	}
449.  	return appr;
450.  }
451.  
452.  /* return 0 (no move), 1 (move) or 2 (dead) */
453.  int
454.  dog_move(mtmp, after)
455.  register struct monst *mtmp;
456.  register int after;	/* this is extra fast monster movement */
457.  {
458.  	int omx, omy;		/* original mtmp position */
459.  	int appr, whappr, udist;
460.  	int i, j, k;
461.  	register struct edog *edog = EDOG(mtmp);
462.  	struct obj *obj = (struct obj *) 0;
463.  	xchar otyp;
464.  	boolean has_edog, cursemsg[9], do_eat = FALSE;
465.  	xchar nix, niy;		/* position mtmp is (considering) moving to */
466.  	register int nx, ny;	/* temporary coordinates */
467.  	xchar cnt, uncursedcnt, chcnt;
468.  	int chi = -1, nidist, ndist;
469.  	coord poss[9];
470.  	long info[9], allowflags;
471.  #define GDIST(x,y) (dist2(x,y,gx,gy))
472.  
473.  	/*
474.  	 * Tame Angels have isminion set and an ispriest structure instead of
475.  	 * an edog structure.  Fortunately, guardian Angels need not worry
476.  	 * about mundane things like eating and fetching objects, and can
477.  	 * spend all their energy defending the player.  (They are the only
478.  	 * monsters with other structures that can be tame.)
479.  	 */
480.  	has_edog = !mtmp->isminion;
481.  
482.  	omx = mtmp->mx;
483.  	omy = mtmp->my;
484.  	if (has_edog && dog_hunger(mtmp, edog)) return(2);	/* starved */
485.  
486.  	udist = distu(omx,omy);
487.  #ifdef STEED
488.  	/* Let steeds eat */
489.  	if (mtmp == u.usteed)
490.  		udist = 1;
491.  	else
492.  #endif
493.  	/* maybe we tamed him while being swallowed --jgm */
494.  	if (!udist) return(0);
495.  
496.  	nix = omx;	/* set before newdogpos */
497.  	niy = omy;
498.  	cursemsg[0] = FALSE;	/* lint suppression */
499.  	info[0] = 0;		/* ditto */
500.  
501.  	if (has_edog) {
502.  	    j = dog_invent(mtmp, edog, udist);
503.  	    if (j == 2) return 2;		/* died */
504.  	    else if (j == 1) goto newdogpos;	/* eating something */
505.  
506.  	    whappr = (monstermoves - edog->whistletime < 5);
507.  	} else
508.  	    whappr = 0;
509.  
510.  	appr = dog_goal(mtmp, has_edog ? edog : (struct edog *)0,
511.  							after, udist, whappr);
512.  	if (appr == -2) return(0);
513.  
514.  	allowflags = ALLOW_M | ALLOW_TRAPS | ALLOW_SSM | ALLOW_SANCT;
515.  	if (passes_walls(mtmp->data)) allowflags |= (ALLOW_ROCK|ALLOW_WALL);
516.  	if (throws_rocks(mtmp->data)) allowflags |= ALLOW_ROCK;
517.  	if (Conflict && !resist(mtmp, RING_CLASS, 0, 0)) {
518.  	    allowflags |= ALLOW_U;
519.  	    if (!has_edog) {
520.  		coord mm;
521.  		/* Guardian angel refuses to be conflicted; rather,
522.  		 * it disappears, angrily, and sends in some nasties
523.  		 */
524.  		if (canspotmon(mtmp)) {
525.  		    pline("%s rebukes you, saying:", Monnam(mtmp));
526.  		    verbalize("Since you desire conflict, have some more!");
527.  		}
528.  		mongone(mtmp);
529.  		i = rnd(4);
530.  		while(i--) {
531.  		    mm.x = u.ux;
532.  		    mm.y = u.uy;
533.  		    if(enexto(&mm, mm.x, mm.y, &mons[PM_ANGEL]))
534.  			(void) mk_roamer(&mons[PM_ANGEL], u.ualign.type,
535.  					 mm.x, mm.y, FALSE);
536.  		}
537.  		return(2);
538.  
539.  	    }
540.  	}
541.  	if (!nohands(mtmp->data) && !verysmall(mtmp->data)) {
542.  		allowflags |= OPENDOOR;
543.  		if (m_carrying(mtmp, SKELETON_KEY)) allowflags |= BUSTDOOR;
544.  	}
545.  	if (is_giant(mtmp->data)) allowflags |= BUSTDOOR;
546.  	if (tunnels(mtmp->data) && !needspick(mtmp->data))
547.  		allowflags |= ALLOW_DIG;
548.  	cnt = mfndpos(mtmp, poss, info, allowflags);
549.  
550.  	/* Normally dogs don't step on cursed items, but if they have no
551.  	 * other choice they will.  This requires checking ahead of time
552.  	 * to see how many uncursed item squares are around.
553.  	 */
554.  	uncursedcnt = 0;
555.  	for (i = 0; i < cnt; i++) {
556.  		nx = poss[i].x; ny = poss[i].y;
557.  		if (MON_AT(nx,ny) && !(info[i] & ALLOW_M)) continue;
558.  		if (cursed_object_at(nx, ny)) continue;
559.  		uncursedcnt++;
560.  	}
561.  
562.  	chcnt = 0;
563.  	chi = -1;
564.  	nidist = GDIST(nix,niy);
565.  
566.  	for (i = 0; i < cnt; i++) {
567.  		nx = poss[i].x;
568.  		ny = poss[i].y;
569.  		cursemsg[i] = FALSE;
570.  
571.  		/* if leashed, we drag him along. */
572.  		if (mtmp->mleashed && distu(nx, ny) > 4) continue;
573.  
574.  		/* if a guardian, try to stay close by choice */
575.  		if (!has_edog &&
576.  		    (j = distu(nx, ny)) > 16 && j >= udist) continue;
577.  
578.  		if ((info[i] & ALLOW_M) && MON_AT(nx, ny)) {
579.  		    int mstatus;
580.  		    register struct monst *mtmp2 = m_at(nx,ny);
581.  
582.  		    if ((int)mtmp2->m_lev >= (int)mtmp->m_lev+2 ||
583.  			(mtmp2->data == &mons[PM_FLOATING_EYE] && rn2(10) &&
584.  			 mtmp->mcansee && haseyes(mtmp->data) && mtmp2->mcansee
585.  			 && (perceives(mtmp->data) || !mtmp2->minvis)) ||
586.  			(mtmp2->data==&mons[PM_GELATINOUS_CUBE] && rn2(10)) ||
587.  			(max_passive_dmg(mtmp2, mtmp) >= mtmp->mhp) ||
588.  			((mtmp->mhp*4 < mtmp->mhpmax
589.  			  || mtmp2->data->msound == MS_GUARDIAN
590.  			  || mtmp2->data->msound == MS_LEADER) &&
591.  			 mtmp2->mpeaceful && !Conflict) ||
592.  			   (touch_petrifies(mtmp2->data) &&
593.  				!resists_ston(mtmp)))
594.  			continue;
595.  
596.  		    if (after) return(0); /* hit only once each move */
597.  
598.  		    notonhead = 0;
599.  		    mstatus = mattackm(mtmp, mtmp2);
600.  
601.  		    /* aggressor (pet) died */
602.  		    if (mstatus & MM_AGR_DIED) return 2;
603.  
604.  		    if ((mstatus & MM_HIT) && !(mstatus & MM_DEF_DIED) &&
605.  			    rn2(4) && mtmp2->mlstmv != monstermoves &&
606.  			    !onscary(mtmp->mx, mtmp->my, mtmp2) &&
607.  			    /* monnear check needed: long worms hit on tail */
608.  			    monnear(mtmp2, mtmp->mx, mtmp->my)) {
609.  			mstatus = mattackm(mtmp2, mtmp);  /* return attack */
610.  			if (mstatus & MM_DEF_DIED) return 2;
611.  		    }
612.  
613.  		    return 0;
614.  		}
615.  
616.  		{   /* Dog avoids harmful traps, but perhaps it has to pass one
617.  		     * in order to follow player.  (Non-harmful traps do not
618.  		     * have ALLOW_TRAPS in info[].)  The dog only avoids the
619.  		     * trap if you've seen it, unlike enemies who avoid traps
620.  		     * if they've seen some trap of that type sometime in the
621.  		     * past.  (Neither behavior is really realistic.)
622.  		     */
623.  		    struct trap *trap;
624.  
625.  		    if ((info[i] & ALLOW_TRAPS) && (trap = t_at(nx,ny))) {
626.  			if (mtmp->mleashed) {
627.  			    if (flags.soundok) whimper(mtmp);
628.  			} else
629.  			    /* 1/40 chance of stepping on it anyway, in case
630.  			     * it has to pass one to follow the player...
631.  			     */
632.  			    if (trap->tseen && rn2(40)) continue;
633.  		    }
634.  		}
635.  
636.  		/* dog eschews cursed objects, but likes dog food */
637.  		/* (minion isn't interested; `cursemsg' stays FALSE) */
638.  		if (has_edog)
639.  		for (obj = level.objects[nx][ny]; obj; obj = obj->nexthere) {
640.  		    if (obj->cursed) cursemsg[i] = TRUE;
641.  		    else if ((otyp = dogfood(mtmp, obj)) < MANFOOD &&
642.  			     (otyp < ACCFOOD || edog->hungrytime <= monstermoves)) {
643.  			/* Note: our dog likes the food so much that he
644.  			 * might eat it even when it conceals a cursed object */
645.  			nix = nx;
646.  			niy = ny;
647.  			chi = i;
648.  			do_eat = TRUE;
649.  			cursemsg[i] = FALSE;	/* not reluctant */
650.  			goto newdogpos;
651.  		    }
652.  		}
653.  		/* didn't find something to eat; if we saw a cursed item and
654.  		   aren't being forced to walk on it, usually keep looking */
655.  		if (cursemsg[i] && !mtmp->mleashed && uncursedcnt > 0 &&
656.  		    rn2(13 * uncursedcnt)) continue;
657.  
658.  		/* lessen the chance of backtracking to previous position(s) */
659.  		k = has_edog ? uncursedcnt : cnt;
660.  		for (j = 0; j < MTSZ && j < k - 1; j++)
661.  			if (nx == mtmp->mtrack[j].x && ny == mtmp->mtrack[j].y)
662.  				if (rn2(MTSZ * (k - j))) goto nxti;
663.  
664.  		j = ((ndist = GDIST(nx,ny)) - nidist) * appr;
665.  		if ((j == 0 && !rn2(++chcnt)) || j < 0 ||
666.  			(j > 0 && !whappr &&
667.  				((omx == nix && omy == niy && !rn2(3))
668.  					|| !rn2(12))
669.  			)) {
670.  			nix = nx;
671.  			niy = ny;
672.  			nidist = ndist;
673.  			if(j < 0) chcnt = 0;
674.  			chi = i;
675.  		}
676.  	nxti:	;
677.  	}
678.  newdogpos:
679.  	if (nix != omx || niy != omy) {
680.  		if (info[chi] & ALLOW_U) {
681.  			if (mtmp->mleashed) { /* play it safe */
682.  				pline("%s breaks loose of %s leash!",
683.  				      Monnam(mtmp), his[pronoun_gender(mtmp)]);
684.  				m_unleash(mtmp);
685.  			}
686.  			(void) mattacku(mtmp);
687.  			return(0);
688.  		}
689.  		if (!m_in_out_region(mtmp, nix, niy))
690.  		    return 1;
691.  		/* insert a worm_move() if worms ever begin to eat things */
692.  		remove_monster(omx, omy);
693.  		place_monster(mtmp, nix, niy);
694.  		if (cursemsg[chi] && (cansee(omx,omy) || cansee(nix,niy)))
695.  			pline("%s moves only reluctantly.", Monnam(mtmp));
696.  		for (j=MTSZ-1; j>0; j--) mtmp->mtrack[j] = mtmp->mtrack[j-1];
697.  		mtmp->mtrack[0].x = omx;
698.  		mtmp->mtrack[0].y = omy;
699.  		/* We have to know if the pet's gonna do a combined eat and
700.  		 * move before moving it, but it can't eat until after being
701.  		 * moved.  Thus the do_eat flag.
702.  		 */
703.  		if (do_eat) {
704.  		    if (dog_eat(mtmp, obj, omx, omy, FALSE) == 2) return 2;
705.  		}
706.  	} else if (mtmp->mleashed && distu(omx, omy) > 4) {
707.  		/* an incredible kludge, but the only way to keep pooch near
708.  		 * after it spends time eating or in a trap, etc.
709.  		 */
710.  		coord cc;
711.  
712.  		nx = sgn(omx - u.ux);
713.  		ny = sgn(omy - u.uy);
714.  		cc.x = u.ux + nx;
715.  		cc.y = u.uy + ny;
716.  		if (goodpos(cc.x, cc.y, mtmp)) goto dognext;
717.  
718.  		i  = xytod(nx, ny);
719.  		for (j = (i + 7)%8; j < (i + 1)%8; j++) {
720.  			dtoxy(&cc, j);
721.  			if (goodpos(cc.x, cc.y, mtmp)) goto dognext;
722.  		}
723.  		for (j = (i + 6)%8; j < (i + 2)%8; j++) {
724.  			dtoxy(&cc, j);
725.  			if (goodpos(cc.x, cc.y, mtmp)) goto dognext;
726.  		}
727.  		cc.x = mtmp->mx;
728.  		cc.y = mtmp->my;
729.  dognext:
730.  		if (!m_in_out_region(mtmp, nix, niy))
731.  		  return 1;
732.  		remove_monster(mtmp->mx, mtmp->my);
733.  		place_monster(mtmp, cc.x, cc.y);
734.  		newsym(cc.x,cc.y);
735.  		set_apparxy(mtmp);
736.  	}
737.  	return(1);
738.  }
739.  
740.  #endif /* OVL0 */
741.  #ifdef OVLB
742.  
743.  /*ARGSUSED*/	/* do_clear_area client */
744.  STATIC_PTR void
745.  wantdoor(x, y, distance)
746.  int x, y;
747.  genericptr_t distance;
748.  {
749.      int ndist;
750.  
751.      if (*(int*)distance > (ndist = distu(x, y))) {
752.  	gx = x;
753.  	gy = y;
754.  	*(int*)distance = ndist;
755.      }
756.  }
757.  
758.  #endif /* OVLB */
759.  
760.  /*dogmove.c*/

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