Source:NetHack 3.4.3/src/dogmove.c

Below is the full text to src/dogmove.c from NetHack 3.4.3. To link to a particular line, write [[dogmove.c#line123]], for example.

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/*	SCCS Id: @(#)dogmove.c	3.4	2002/09/10	*/
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* NetHack may be freely redistributed.  See license for details. */

The NetHack General Public License applies to screenshots, source code and other content from NetHack.

This content was modified from the original NetHack source code distribution (by splitting up NetHack content between wiki pages, and possibly further editing). See the page history for a list of who changed it, and on what dates.

#include "hack.h"

#include "mfndpos.h"
#include "edog.h"

extern boolean notonhead;

#ifdef OVL0

STATIC_DCL boolean FDECL(dog_hunger,(struct monst *,struct edog *));
STATIC_DCL int FDECL(dog_invent,(struct monst *,struct edog *,int));
STATIC_DCL int FDECL(dog_goal,(struct monst *,struct edog *,int,int,int));

STATIC_DCL struct obj *FDECL(DROPPABLES, (struct monst *));
STATIC_DCL boolean FDECL(can_reach_location,(struct monst *,XCHAR_P,XCHAR_P,
XCHAR_P,XCHAR_P));
STATIC_DCL boolean FDECL(could_reach_item,(struct monst *, XCHAR_P,XCHAR_P));

DROPPABLES

STATIC_OVL struct obj *
DROPPABLES(mon)
register struct monst *mon;
{
	register struct obj *obj;
	struct obj *wep = MON_WEP(mon);
	boolean item1 = FALSE, item2 = FALSE;

	if (is_animal(mon->data) || mindless(mon->data))
		item1 = item2 = TRUE;
	if (!tunnels(mon->data) || !needspick(mon->data))
		item1 = TRUE;
	for(obj = mon->minvent; obj; obj = obj->nobj) {
		if (!item1 && is_pick(obj) && (obj->otyp != DWARVISH_MATTOCK
						|| !which_armor(mon, W_ARMS))) {
			item1 = TRUE;
			continue;
		}
		if (!item2 && obj->otyp == UNICORN_HORN && !obj->cursed) {
			item2 = TRUE;
			continue;
		}
		if (!obj->owornmask && obj != wep) return obj;
	}
	return (struct obj *)0;
}

static NEARDATA const char nofetch[] = { BALL_CLASS, CHAIN_CLASS, ROCK_CLASS, 0 };

#endif /* OVL0 */

STATIC_OVL boolean FDECL(cursed_object_at, (int, int));

STATIC_VAR xchar gtyp, gx, gy;	/* type and position of dog's current goal */

STATIC_PTR void FDECL(wantdoor, (int, int, genericptr_t));

cursed_object_at

#ifdef OVLB
STATIC_OVL boolean
cursed_object_at(x, y)
int x, y;
{
	struct obj *otmp;

	for(otmp = level.objects[x][y]; otmp; otmp = otmp->nexthere)
		if (otmp->cursed) return TRUE;
	return FALSE;
}

dog_nutrition

int
dog_nutrition(mtmp, obj)
struct monst *mtmp;
struct obj *obj;
{
	int nutrit;

	/*
	 * It is arbitrary that the pet takes the same length of time to eat
	 * as a human, but gets more nutritional value.
	 */
	if (obj->oclass == FOOD_CLASS) {
	    if(obj->otyp == CORPSE) {
		mtmp->meating = 3 + (mons[obj->corpsenm].cwt >> 6);
		nutrit = mons[obj->corpsenm].cnutrit;
	    } else {
		mtmp->meating = objects[obj->otyp].oc_delay;
		nutrit = objects[obj->otyp].oc_nutrition;
	    }
	    switch(mtmp->data->msize) {
		case MZ_TINY: nutrit *= 8; break;
		case MZ_SMALL: nutrit *= 6; break;
		default:
		case MZ_MEDIUM: nutrit *= 5; break;
		case MZ_LARGE: nutrit *= 4; break;
		case MZ_HUGE: nutrit *= 3; break;
		case MZ_GIGANTIC: nutrit *= 2; break;
	    }
	    if(obj->oeaten) {
		mtmp->meating = eaten_stat(mtmp->meating, obj);
		nutrit = eaten_stat(nutrit, obj);
	    }
	} else if (obj->oclass == COIN_CLASS) {
	    mtmp->meating = (int)(obj->quan/2000) + 1;
	    if (mtmp->meating < 0) mtmp->meating = 1;
	    nutrit = (int)(obj->quan/20);
	    if (nutrit < 0) nutrit = 0;
	} else {
	    /* Unusual pet such as gelatinous cube eating odd stuff.
	     * meating made consistent with wild monsters in mon.c.
	     * nutrit made consistent with polymorphed player nutrit in
	     * eat.c.  (This also applies to pets eating gold.)
	     */
	    mtmp->meating = obj->owt/20 + 1;
	    nutrit = 5*objects[obj->otyp].oc_nutrition;
	}
	return nutrit;
}

dog_eat

/* returns 2 if pet dies, otherwise 1 */
int
dog_eat(mtmp, obj, x, y, devour)
register struct monst *mtmp;
register struct obj * obj;
int x, y;
boolean devour;
{
	register struct edog *edog = EDOG(mtmp);
	boolean poly = FALSE, grow = FALSE, heal = FALSE;
	int nutrit;

	if(edog->hungrytime < monstermoves)
	    edog->hungrytime = monstermoves;
	nutrit = dog_nutrition(mtmp, obj);
	poly = polyfodder(obj);
	grow = mlevelgain(obj);
	heal = mhealup(obj);
	if (devour) {
	    if (mtmp->meating > 1) mtmp->meating /= 2;
	    if (nutrit > 1) nutrit = (nutrit * 3) / 4;
	}
	edog->hungrytime += nutrit;
	mtmp->mconf = 0;
	if (edog->mhpmax_penalty) {
	    /* no longer starving */
	    mtmp->mhpmax += edog->mhpmax_penalty;
	    edog->mhpmax_penalty = 0;
	}
	if (mtmp->mflee && mtmp->mfleetim > 1) mtmp->mfleetim /= 2;
	if (mtmp->mtame < 20) mtmp->mtame++;
	if (x != mtmp->mx || y != mtmp->my) {	/* moved & ate on same turn */
	    newsym(x, y);
	    newsym(mtmp->mx, mtmp->my);
	}
	if (is_pool(x, y) && !Underwater) {
	    /* Don't print obj */
	    /* TODO: Reveal presence of sea monster (especially sharks) */
	} else
	/* hack: observe the action if either new or old location is in view */
	/* However, invisible monsters should still be "it" even though out of
	   sight locations should not. */
	if (cansee(x, y) || cansee(mtmp->mx, mtmp->my))
	    pline("%s %s %s.", mon_visible(mtmp) ? noit_Monnam(mtmp) : "It",
		  devour ? "devours" : "eats",
		  (obj->oclass == FOOD_CLASS) ?
			singular(obj, doname) : doname(obj));
	/* It's a reward if it's DOGFOOD and the player dropped/threw it. */
	/* We know the player had it if invlet is set -dlc */
	if(dogfood(mtmp,obj) == DOGFOOD && obj->invlet)
#ifdef LINT
	    edog->apport = 0;
#else
	    edog->apport += (int)(200L/
		((long)edog->dropdist + monstermoves - edog->droptime));
#endif
	if (mtmp->data == &mons[PM_RUST_MONSTER] && obj->oerodeproof) {
	    /* The object's rustproofing is gone now */
	    obj->oerodeproof = 0;
	    mtmp->mstun = 1;
	    if (canseemon(mtmp) && flags.verbose) {
		pline("%s spits %s out in disgust!",
		      Monnam(mtmp), distant_name(obj,doname));
	    }
	} else if (obj == uball) {
	    unpunish();
	    delobj(obj);
	} else if (obj == uchain)
	    unpunish();
	else if (obj->quan > 1L && obj->oclass == FOOD_CLASS) {
	    obj->quan--;
	    obj->owt = weight(obj);
	} else
	    delobj(obj);

	if (poly) {
	    (void) newcham(mtmp, (struct permonst *)0, FALSE,
			   cansee(mtmp->mx, mtmp->my));
	}
	/* limit "instant" growth to prevent potential abuse */
	if (grow && (int) mtmp->m_lev < (int)mtmp->data->mlevel + 15) {
	    if (!grow_up(mtmp, (struct monst *)0)) return 2;
	}
	if (heal) mtmp->mhp = mtmp->mhpmax;
	return 1;
}

#endif /* OVLB */

dog_hunger

#ifdef OVL0

/* hunger effects -- returns TRUE on starvation */
STATIC_OVL boolean
dog_hunger(mtmp, edog)
register struct monst *mtmp;
register struct edog *edog;
{
	if (monstermoves > edog->hungrytime + 500) {
	    if (!carnivorous(mtmp->data) && !herbivorous(mtmp->data)) {
		edog->hungrytime = monstermoves + 500;
		/* but not too high; it might polymorph */
	    } else if (!edog->mhpmax_penalty) {
		/* starving pets are limited in healing */
		int newmhpmax = mtmp->mhpmax / 3;
		mtmp->mconf = 1;
		edog->mhpmax_penalty = mtmp->mhpmax - newmhpmax;
		mtmp->mhpmax = newmhpmax;
		if (mtmp->mhp > mtmp->mhpmax)
		    mtmp->mhp = mtmp->mhpmax;
		if (mtmp->mhp < 1) goto dog_died;
		if (cansee(mtmp->mx, mtmp->my))
		    pline("%s is confused from hunger.", Monnam(mtmp));
		else if (couldsee(mtmp->mx, mtmp->my))
		    beg(mtmp);
		else
		    You_feel("worried about %s.", y_monnam(mtmp));
		stop_occupation();
	    } else if (monstermoves > edog->hungrytime + 750 || mtmp->mhp < 1) {
dog_died:
		if (mtmp->mleashed
#ifdef STEED
		    && mtmp != u.usteed
#endif
		    )
		    Your("leash goes slack.");
		else if (cansee(mtmp->mx, mtmp->my))
		    pline("%s starves.", Monnam(mtmp));
		else
		    You_feel("%s for a moment.",
			Hallucination ? "bummed" : "sad");
		mondied(mtmp);
		return(TRUE);
	    }
	}
	return(FALSE);
}

dog_invent

/* do something with object (drop, pick up, eat) at current position
* returns 1 if object eaten (since that counts as dog's move), 2 if died
*/
STATIC_OVL int
dog_invent(mtmp, edog, udist)
register struct monst *mtmp;
register struct edog *edog;
int udist;
{
	register int omx, omy;
	struct obj *obj;

	if (mtmp->msleeping || !mtmp->mcanmove) return(0);

	omx = mtmp->mx;
	omy = mtmp->my;

	/* if we are carrying sth then we drop it (perhaps near @) */
	/* Note: if apport == 1 then our behaviour is independent of udist */
	/* Use udist+1 so steed won't cause divide by zero */
#ifndef GOLDOBJ
	if(DROPPABLES(mtmp) || mtmp->mgold) {
#else
	if(DROPPABLES(mtmp)) {
#endif
	    if (!rn2(udist+1) || !rn2(edog->apport))
		if(rn2(10) < edog->apport){
		    relobj(mtmp, (int)mtmp->minvis, TRUE);
		    if(edog->apport > 1) edog->apport--;
		    edog->dropdist = udist;		/* hpscdi!jon */
		    edog->droptime = monstermoves;
		}
	} else {
	    if((obj=level.objects[omx][omy]) && !index(nofetch,obj->oclass)
#ifdef MAIL
			&& obj->otyp != SCR_MAIL
#endif
									){
		int edible = dogfood(mtmp, obj);

		if ((edible <= CADAVER ||
			/* starving pet is more aggressive about eating */
			(edog->mhpmax_penalty && edible == ACCFOOD)) &&
		    could_reach_item(mtmp, obj->ox, obj->oy))
		    return dog_eat(mtmp, obj, omx, omy, FALSE);

		if(can_carry(mtmp, obj) && !obj->cursed &&
			could_reach_item(mtmp, obj->ox, obj->oy)) {
		    if(rn2(20) < edog->apport+3) {
			if (rn2(udist) || !rn2(edog->apport)) {
			    if (cansee(omx, omy) && flags.verbose)
				pline("%s picks up %s.", Monnam(mtmp),
				    distant_name(obj, doname));
			    obj_extract_self(obj);
			    newsym(omx,omy);
			    (void) mpickobj(mtmp,obj);
			    if (attacktype(mtmp->data, AT_WEAP) &&
					mtmp->weapon_check == NEED_WEAPON) {
				mtmp->weapon_check = NEED_HTH_WEAPON;
				(void) mon_wield_item(mtmp);
			    }
			    m_dowear(mtmp, FALSE);
			}
		    }
		}
	    }
	}
	return 0;
}

dog_goal

/* set dog's goal -- gtyp, gx, gy
* returns -1/0/1 (dog's desire to approach player) or -2 (abort move)
*/
STATIC_OVL int
dog_goal(mtmp, edog, after, udist, whappr)
register struct monst *mtmp;
struct edog *edog;
int after, udist, whappr;
{
	register int omx, omy;
	boolean in_masters_sight, dog_has_minvent;
	register struct obj *obj;
	xchar otyp;
	int appr;

#ifdef STEED
	/* Steeds don't move on their own will */
	if (mtmp == u.usteed)
		return (-2);
#endif

	omx = mtmp->mx;
	omy = mtmp->my;

	in_masters_sight = couldsee(omx, omy);
	dog_has_minvent = (DROPPABLES(mtmp) != 0);

	if (!edog || mtmp->mleashed) {	/* he's not going anywhere... */
	    gtyp = APPORT;
	    gx = u.ux;
	    gy = u.uy;
	} else {
#define DDIST(x,y) (dist2(x,y,omx,omy))
#define SQSRCHRADIUS 5
	    int min_x, max_x, min_y, max_y;
	    register int nx, ny;

	    gtyp = UNDEF;	/* no goal as yet */
	    gx = gy = 0;	/* suppress 'used before set' message */

	    if ((min_x = omx - SQSRCHRADIUS) < 1) min_x = 1;
	    if ((max_x = omx + SQSRCHRADIUS) >= COLNO) max_x = COLNO - 1;
	    if ((min_y = omy - SQSRCHRADIUS) < 0) min_y = 0;
	    if ((max_y = omy + SQSRCHRADIUS) >= ROWNO) max_y = ROWNO - 1;

	    /* nearby food is the first choice, then other objects */
	    for (obj = fobj; obj; obj = obj->nobj) {
		nx = obj->ox;
		ny = obj->oy;
		if (nx >= min_x && nx <= max_x && ny >= min_y && ny <= max_y) {
		    otyp = dogfood(mtmp, obj);
		    /* skip inferior goals */
		    if (otyp > gtyp || otyp == UNDEF)
			continue;
		    /* avoid cursed items unless starving */
		    if (cursed_object_at(nx, ny) &&
			    !(edog->mhpmax_penalty && otyp < MANFOOD))
			continue;
		    /* skip completely unreacheable goals */
		    if (!could_reach_item(mtmp, nx, ny) ||
		        !can_reach_location(mtmp, mtmp->mx, mtmp->my, nx, ny))
			continue;
		    if (otyp < MANFOOD) {
			if (otyp < gtyp || DDIST(nx,ny) < DDIST(gx,gy)) {
			    gx = nx;
			    gy = ny;
			    gtyp = otyp;
			}
		    } else if(gtyp == UNDEF && in_masters_sight &&
			      !dog_has_minvent &&
			      (!levl[omx][omy].lit || levl[u.ux][u.uy].lit) &&
			      (otyp == MANFOOD || m_cansee(mtmp, nx, ny)) &&
			      edog->apport > rn2(8) &&
			      can_carry(mtmp,obj)) {
			gx = nx;
			gy = ny;
			gtyp = APPORT;
		    }
		}
	    }
	}

	/* follow player if appropriate */
	if (gtyp == UNDEF ||
	    (gtyp != DOGFOOD && gtyp != APPORT && monstermoves < edog->hungrytime)) {
		gx = u.ux;
		gy = u.uy;
		if (after && udist <= 4 && gx == u.ux && gy == u.uy)
			return(-2);
		appr = (udist >= 9) ? 1 : (mtmp->mflee) ? -1 : 0;
		if (udist > 1) {
			if (!IS_ROOM(levl[u.ux][u.uy].typ) || !rn2(4) ||
			   whappr ||
			   (dog_has_minvent && rn2(edog->apport)))
				appr = 1;
		}
		/* if you have dog food it'll follow you more closely */
		if (appr == 0) {
			obj = invent;
			while (obj) {
				if(dogfood(mtmp, obj) == DOGFOOD) {
					appr = 1;
					break;
				}
				obj = obj->nobj;
			}
		}
	} else
	    appr = 1;	/* gtyp != UNDEF */
	if(mtmp->mconf)
	    appr = 0;

#define FARAWAY (COLNO + 2)		/* position outside screen */
	if (gx == u.ux && gy == u.uy && !in_masters_sight) {
	    register coord *cp;

	    cp = gettrack(omx,omy);
	    if (cp) {
		gx = cp->x;
		gy = cp->y;
		if(edog) edog->ogoal.x = 0;
	    } else {
		/* assume master hasn't moved far, and reuse previous goal */
		if(edog && edog->ogoal.x &&
		   ((edog->ogoal.x != omx) || (edog->ogoal.y != omy))) {
		    gx = edog->ogoal.x;
		    gy = edog->ogoal.y;
		    edog->ogoal.x = 0;
		} else {
		    int fardist = FARAWAY * FARAWAY;
		    gx = gy = FARAWAY; /* random */
		    do_clear_area(omx, omy, 9, wantdoor,
				  (genericptr_t)&fardist);

		    /* here gx == FARAWAY e.g. when dog is in a vault */
		    if (gx == FARAWAY || (gx == omx && gy == omy)) {
			gx = u.ux;
			gy = u.uy;
		    } else if(edog) {
			edog->ogoal.x = gx;
			edog->ogoal.y = gy;
		    }
		}
	    }
	} else if(edog) {
	    edog->ogoal.x = 0;
	}
	return appr;
}

dog_move

/* return 0 (no move), 1 (move) or 2 (dead) */
int
dog_move(mtmp, after)
register struct monst *mtmp;
register int after;	/* this is extra fast monster movement */
{
	int omx, omy;		/* original mtmp position */
	int appr, whappr, udist;
	int i, j, k;
	register struct edog *edog = EDOG(mtmp);
	struct obj *obj = (struct obj *) 0;
	xchar otyp;
	boolean has_edog, cursemsg[9], do_eat = FALSE;
	xchar nix, niy;		/* position mtmp is (considering) moving to */
	register int nx, ny;	/* temporary coordinates */
	xchar cnt, uncursedcnt, chcnt;
	int chi = -1, nidist, ndist;
	coord poss[9];
	long info[9], allowflags;
#define GDIST(x,y) (dist2(x,y,gx,gy))

	/*
	 * Tame Angels have isminion set and an ispriest structure instead of
	 * an edog structure.  Fortunately, guardian Angels need not worry
	 * about mundane things like eating and fetching objects, and can
	 * spend all their energy defending the player.  (They are the only
	 * monsters with other structures that can be tame.)
	 */
	has_edog = !mtmp->isminion;

	omx = mtmp->mx;
	omy = mtmp->my;
	if (has_edog && dog_hunger(mtmp, edog)) return(2);	/* starved */

	udist = distu(omx,omy);
#ifdef STEED
	/* Let steeds eat and maybe throw rider during Conflict */
	if (mtmp == u.usteed) {
	    if (Conflict && !resist(mtmp, RING_CLASS, 0, 0)) {
		dismount_steed(DISMOUNT_THROWN);
		return (1);
	    }
	    udist = 1;
	} else
#endif
	/* maybe we tamed him while being swallowed --jgm */
	if (!udist) return(0);

	nix = omx;	/* set before newdogpos */
	niy = omy;
	cursemsg[0] = FALSE;	/* lint suppression */
	info[0] = 0;		/* ditto */

	if (has_edog) {
	    j = dog_invent(mtmp, edog, udist);
	    if (j == 2) return 2;		/* died */
	    else if (j == 1) goto newdogpos;	/* eating something */

	    whappr = (monstermoves - edog->whistletime < 5);
	} else
	    whappr = 0;

	appr = dog_goal(mtmp, has_edog ? edog : (struct edog *)0,
							after, udist, whappr);
	if (appr == -2) return(0);

	allowflags = ALLOW_M | ALLOW_TRAPS | ALLOW_SSM | ALLOW_SANCT;
	if (passes_walls(mtmp->data)) allowflags |= (ALLOW_ROCK | ALLOW_WALL);
	if (passes_bars(mtmp->data)) allowflags |= ALLOW_BARS;
	if (throws_rocks(mtmp->data)) allowflags |= ALLOW_ROCK;
	if (Conflict && !resist(mtmp, RING_CLASS, 0, 0)) {
	    allowflags |= ALLOW_U;
	    if (!has_edog) {
		coord mm;
		/* Guardian angel refuses to be conflicted; rather,
		 * it disappears, angrily, and sends in some nasties
		 */
		if (canspotmon(mtmp)) {
		    pline("%s rebukes you, saying:", Monnam(mtmp));
		    verbalize("Since you desire conflict, have some more!");
		}
		mongone(mtmp);
		i = rnd(4);
		while(i--) {
		    mm.x = u.ux;
		    mm.y = u.uy;
		    if(enexto(&mm, mm.x, mm.y, &mons[PM_ANGEL]))
			(void) mk_roamer(&mons[PM_ANGEL], u.ualign.type,
					 mm.x, mm.y, FALSE);
		}
		return(2);

	    }
	}
	if (!Conflict && !mtmp->mconf &&
	    mtmp == u.ustuck && !sticks(youmonst.data)) {
	    unstuck(mtmp);	/* swallowed case handled above */
	    You("get released!");
	}
	if (!nohands(mtmp->data) && !verysmall(mtmp->data)) {
		allowflags |= OPENDOOR;
		if (m_carrying(mtmp, SKELETON_KEY)) allowflags |= BUSTDOOR;
	}
	if (is_giant(mtmp->data)) allowflags |= BUSTDOOR;
	if (tunnels(mtmp->data)) allowflags |= ALLOW_DIG;
	cnt = mfndpos(mtmp, poss, info, allowflags);

	/* Normally dogs don't step on cursed items, but if they have no
	 * other choice they will.  This requires checking ahead of time
	 * to see how many uncursed item squares are around.
	 */
	uncursedcnt = 0;
	for (i = 0; i < cnt; i++) {
		nx = poss[i].x; ny = poss[i].y;
		if (MON_AT(nx,ny) && !(info[i] & ALLOW_M)) continue;
		if (cursed_object_at(nx, ny)) continue;
		uncursedcnt++;
	}

	chcnt = 0;
	chi = -1;
	nidist = GDIST(nix,niy);

	for (i = 0; i < cnt; i++) {
		nx = poss[i].x;
		ny = poss[i].y;
		cursemsg[i] = FALSE;

		/* if leashed, we drag him along. */
		if (mtmp->mleashed && distu(nx, ny) > 4) continue;

		/* if a guardian, try to stay close by choice */
		if (!has_edog &&
		    (j = distu(nx, ny)) > 16 && j >= udist) continue;

		if ((info[i] & ALLOW_M) && MON_AT(nx, ny)) {
		    int mstatus;
		    register struct monst *mtmp2 = m_at(nx,ny);

		    if ((int)mtmp2->m_lev >= (int)mtmp->m_lev+2 ||
			(mtmp2->data == &mons[PM_FLOATING_EYE] && rn2(10) &&
			 mtmp->mcansee && haseyes(mtmp->data) && mtmp2->mcansee
			 && (perceives(mtmp->data) || !mtmp2->minvis)) ||
			(mtmp2->data==&mons[PM_GELATINOUS_CUBE] && rn2(10)) ||
			(max_passive_dmg(mtmp2, mtmp) >= mtmp->mhp) ||
			((mtmp->mhp*4 < mtmp->mhpmax
			  || mtmp2->data->msound == MS_GUARDIAN
			  || mtmp2->data->msound == MS_LEADER) &&
			 mtmp2->mpeaceful && !Conflict) ||
			   (touch_petrifies(mtmp2->data) &&
				!resists_ston(mtmp)))
			continue;

		    if (after) return(0); /* hit only once each move */

		    notonhead = 0;
		    mstatus = mattackm(mtmp, mtmp2);

		    /* aggressor (pet) died */
		    if (mstatus & MM_AGR_DIED) return 2;

		    if ((mstatus & MM_HIT) && !(mstatus & MM_DEF_DIED) &&
			    rn2(4) && mtmp2->mlstmv != monstermoves &&
			    !onscary(mtmp->mx, mtmp->my, mtmp2) &&
			    /* monnear check needed: long worms hit on tail */
			    monnear(mtmp2, mtmp->mx, mtmp->my)) {
			mstatus = mattackm(mtmp2, mtmp);  /* return attack */
			if (mstatus & MM_DEF_DIED) return 2;
		    }

		    return 0;
		}

		{   /* Dog avoids harmful traps, but perhaps it has to pass one
		     * in order to follow player.  (Non-harmful traps do not
		     * have ALLOW_TRAPS in info[].)  The dog only avoids the
		     * trap if you've seen it, unlike enemies who avoid traps
		     * if they've seen some trap of that type sometime in the
		     * past.  (Neither behavior is really realistic.)
		     */
		    struct trap *trap;

		    if ((info[i] & ALLOW_TRAPS) && (trap = t_at(nx,ny))) {
			if (mtmp->mleashed) {
			    if (flags.soundok) whimper(mtmp);
			} else
			    /* 1/40 chance of stepping on it anyway, in case
			     * it has to pass one to follow the player...
			     */
			    if (trap->tseen && rn2(40)) continue;
		    }
		}

		/* dog eschews cursed objects, but likes dog food */
		/* (minion isn't interested; `cursemsg' stays FALSE) */
		if (has_edog)
		for (obj = level.objects[nx][ny]; obj; obj = obj->nexthere) {
		    if (obj->cursed) cursemsg[i] = TRUE;
		    else if ((otyp = dogfood(mtmp, obj)) < MANFOOD &&
			     (otyp < ACCFOOD || edog->hungrytime <= monstermoves)) {
			/* Note: our dog likes the food so much that he
			 * might eat it even when it conceals a cursed object */
			nix = nx;
			niy = ny;
			chi = i;
			do_eat = TRUE;
			cursemsg[i] = FALSE;	/* not reluctant */
			goto newdogpos;
		    }
		}
		/* didn't find something to eat; if we saw a cursed item and
		   aren't being forced to walk on it, usually keep looking */
		if (cursemsg[i] && !mtmp->mleashed && uncursedcnt > 0 &&
		    rn2(13 * uncursedcnt)) continue;

		/* lessen the chance of backtracking to previous position(s) */
		k = has_edog ? uncursedcnt : cnt;
		for (j = 0; j < MTSZ && j < k - 1; j++)
			if (nx == mtmp->mtrack[j].x && ny == mtmp->mtrack[j].y)
				if (rn2(MTSZ * (k - j))) goto nxti;

		j = ((ndist = GDIST(nx,ny)) - nidist) * appr;
		if ((j == 0 && !rn2(++chcnt)) || j < 0 ||
			(j > 0 && !whappr &&
				((omx == nix && omy == niy && !rn2(3))
					|| !rn2(12))
			)) {
			nix = nx;
			niy = ny;
			nidist = ndist;
			if(j < 0) chcnt = 0;
			chi = i;
		}
	nxti:	;
	}
newdogpos:
	if (nix != omx || niy != omy) {
		struct obj *mw_tmp;

		if (info[chi] & ALLOW_U) {
			if (mtmp->mleashed) { /* play it safe */
				pline("%s breaks loose of %s leash!",
				      Monnam(mtmp), mhis(mtmp));
				m_unleash(mtmp, FALSE);
			}
			(void) mattacku(mtmp);
			return(0);
		}
		if (!m_in_out_region(mtmp, nix, niy))
		    return 1;
		if (((IS_ROCK(levl[nix][niy].typ) && may_dig(nix,niy)) ||
		     closed_door(nix, niy)) &&
		    mtmp->weapon_check != NO_WEAPON_WANTED &&
		    tunnels(mtmp->data) && needspick(mtmp->data)) {
		    if (closed_door(nix, niy)) {
			if (!(mw_tmp = MON_WEP(mtmp)) ||
			    !is_pick(mw_tmp) || !is_axe(mw_tmp))
			    mtmp->weapon_check = NEED_PICK_OR_AXE;
		    } else if (IS_TREE(levl[nix][niy].typ)) {
			if (!(mw_tmp = MON_WEP(mtmp)) || !is_axe(mw_tmp))
			    mtmp->weapon_check = NEED_AXE;
		    } else if (!(mw_tmp = MON_WEP(mtmp)) || !is_pick(mw_tmp)) {
			mtmp->weapon_check = NEED_PICK_AXE;
		    }
		    if (mtmp->weapon_check >= NEED_PICK_AXE &&
			mon_wield_item(mtmp))
			return 0;
		}
		/* insert a worm_move() if worms ever begin to eat things */
		remove_monster(omx, omy);
		place_monster(mtmp, nix, niy);
		if (cursemsg[chi] && (cansee(omx,omy) || cansee(nix,niy)))
			pline("%s moves only reluctantly.", Monnam(mtmp));
		for (j=MTSZ-1; j>0; j--) mtmp->mtrack[j] = mtmp->mtrack[j-1];
		mtmp->mtrack[0].x = omx;
		mtmp->mtrack[0].y = omy;
		/* We have to know if the pet's gonna do a combined eat and
		 * move before moving it, but it can't eat until after being
		 * moved.  Thus the do_eat flag.
		 */
		if (do_eat) {
		    if (dog_eat(mtmp, obj, omx, omy, FALSE) == 2) return 2;
		}
	} else if (mtmp->mleashed && distu(omx, omy) > 4) {
		/* an incredible kludge, but the only way to keep pooch near
		 * after it spends time eating or in a trap, etc.
		 */
		coord cc;

		nx = sgn(omx - u.ux);
		ny = sgn(omy - u.uy);
		cc.x = u.ux + nx;
		cc.y = u.uy + ny;
		if (goodpos(cc.x, cc.y, mtmp, 0)) goto dognext;

		i  = xytod(nx, ny);
		for (j = (i + 7)%8; j < (i + 1)%8; j++) {
			dtoxy(&cc, j);
			if (goodpos(cc.x, cc.y, mtmp, 0)) goto dognext;
		}
		for (j = (i + 6)%8; j < (i + 2)%8; j++) {
			dtoxy(&cc, j);
			if (goodpos(cc.x, cc.y, mtmp, 0)) goto dognext;
		}
		cc.x = mtmp->mx;
		cc.y = mtmp->my;
dognext:
		if (!m_in_out_region(mtmp, nix, niy))
		  return 1;
		remove_monster(mtmp->mx, mtmp->my);
		place_monster(mtmp, cc.x, cc.y);
		newsym(cc.x,cc.y);
		set_apparxy(mtmp);
	}
	return(1);
}

could_reach_item

/* check if a monster could pick up objects from a location */
STATIC_OVL boolean
could_reach_item(mon, nx, ny)
struct monst *mon;
xchar nx, ny;
{
if ((!is_pool(nx,ny) || is_swimmer(mon->data)) &&
	(!is_lava(nx,ny) || likes_lava(mon->data)) &&
	(!sobj_at(BOULDER,nx,ny) || throws_rocks(mon->data)))
	return TRUE;
return FALSE;
}

can_reach_location

/* Hack to prevent a dog from being endlessly stuck near an object that
* it can't reach, such as caught in a teleport scroll niche.  It recursively
* checks to see if the squares in between are good.  The checking could be a
* little smarter; a full check would probably be useful in m_move() too.
* Since the maximum food distance is 5, this should never be more than 5 calls
* deep.
*/
STATIC_OVL boolean
can_reach_location(mon, mx, my, fx, fy)
struct monst *mon;
xchar mx, my, fx, fy;
{
int i, j;
int dist;

if (mx == fx && my == fy) return TRUE;
if (!isok(mx, my)) return FALSE; /* should not happen */

dist = dist2(mx, my, fx, fy);
for(i=mx-1; i<=mx+1; i++) {
	for(j=my-1; j<=my+1; j++) {
	    if (!isok(i, j))
		continue;
	    if (dist2(i, j, fx, fy) >= dist)
		continue;
	    if (IS_ROCK(levl[i][j].typ) && !passes_walls(mon->data) &&
				    (!may_dig(i,j) || !tunnels(mon->data)))
		continue;
	    if (IS_DOOR(levl[i][j].typ) &&
				(levl[i][j].doormask & (D_CLOSED | D_LOCKED)))
		continue;
	    if (!could_reach_item(mon, i, j))
		continue;
	    if (can_reach_location(mon, i, j, fx, fy))
		return TRUE;
	}
}
return FALSE;
}

#endif /* OVL0 */

wantdoor

#ifdef OVLB

/*ARGSUSED*/	/* do_clear_area client */
STATIC_PTR void
wantdoor(x, y, distance)
int x, y;
genericptr_t distance;
{
int ndist;

if (*(int*)distance > (ndist = distu(x, y))) {
	gx = x;
	gy = y;
	*(int*)distance = ndist;
}
}

#endif /* OVLB */

/*dogmove.c*/