Source:NetHack 3.3.0/dogmove.c

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

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*/