1/*	$OpenBSD: hack.dog.c,v 1.9 2016/01/09 18:33:15 mestre Exp $	*/
2
3/*
4 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
5 * Amsterdam
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * - Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * - Neither the name of the Stichting Centrum voor Wiskunde en
20 * Informatica, nor the names of its contributors may be used to endorse or
21 * promote products derived from this software without specific prior
22 * written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
25 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
28 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37/*
38 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
39 * All rights reserved.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 *    notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 *    notice, this list of conditions and the following disclaimer in the
48 *    documentation and/or other materials provided with the distribution.
49 * 3. The name of the author may not be used to endorse or promote products
50 *    derived from this software without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
53 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
54 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
55 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
56 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
57 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
58 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
59 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
60 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
61 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 */
63
64#include "def.edog.h"
65#include "hack.h"
66#include "hack.mfndpos.h"
67
68extern struct monst *makemon(struct permonst *, int, int);
69
70static void initedog(struct monst *);
71static int  dogfood(struct obj *);
72
73struct permonst li_dog =
74	{ "little dog", 'd',2,18,6,1,6,sizeof(struct edog) };
75struct permonst dog =
76	{ "dog", 'd',4,16,5,1,6,sizeof(struct edog) };
77struct permonst la_dog =
78	{ "large dog", 'd',6,15,4,2,4,sizeof(struct edog) };
79
80
81void
82makedog(void)
83{
84	struct monst *mtmp = makemon(&li_dog,u.ux,u.uy);
85
86	if(!mtmp) return; /* dogs were genocided */
87	initedog(mtmp);
88}
89
90void
91initedog(struct monst *mtmp)
92{
93	mtmp->mtame = mtmp->mpeaceful = 1;
94	EDOG(mtmp)->hungrytime = 1000 + moves;
95	EDOG(mtmp)->eattime = 0;
96	EDOG(mtmp)->droptime = 0;
97	EDOG(mtmp)->dropdist = 10000;
98	EDOG(mtmp)->apport = 10;
99	EDOG(mtmp)->whistletime = 0;
100}
101
102/* attach the monsters that went down (or up) together with @ */
103struct monst *mydogs = 0;
104struct monst *fallen_down = 0;	/* monsters that fell through a trapdoor */
105	/* they will appear on the next level @ goes to, even if he goes up! */
106
107void
108losedogs(void)
109{
110	struct monst *mtmp;
111
112	while ((mtmp = mydogs)) {
113		mydogs = mtmp->nmon;
114		mtmp->nmon = fmon;
115		fmon = mtmp;
116		mnexto(mtmp);
117	}
118	while ((mtmp = fallen_down) ){
119		fallen_down = mtmp->nmon;
120		mtmp->nmon = fmon;
121		fmon = mtmp;
122		rloc(mtmp);
123	}
124}
125
126void
127keepdogs(void)
128{
129	struct monst *mtmp;
130
131	for(mtmp = fmon; mtmp; mtmp = mtmp->nmon)
132	    if(dist(mtmp->mx,mtmp->my) < 3 && follower(mtmp)
133		&& !mtmp->msleep && !mtmp->mfroz) {
134		relmon(mtmp);
135		mtmp->nmon = mydogs;
136		mydogs = mtmp;
137		unpmon(mtmp);
138		keepdogs();	/* we destroyed the link, so use recursion */
139		return;		/* (admittedly somewhat primitive) */
140	}
141}
142
143void
144fall_down(struct monst *mtmp)
145{
146	relmon(mtmp);
147	mtmp->nmon = fallen_down;
148	fallen_down = mtmp;
149	unpmon(mtmp);
150	mtmp->mtame = 0;
151}
152
153/* return quality of food; the lower the better */
154#define	DOGFOOD	0
155#define	CADAVER	1
156#define	ACCFOOD	2
157#define	MANFOOD	3
158#define	APPORT	4
159#define	POISON	5
160#define	UNDEF	6
161static int
162dogfood(struct obj *obj)
163{
164	switch(obj->olet) {
165	case FOOD_SYM:
166	    return(
167		(obj->otyp == TRIPE_RATION) ? DOGFOOD :
168		(obj->otyp < CARROT) ? ACCFOOD :
169		(obj->otyp < CORPSE) ? MANFOOD :
170		(poisonous(obj) || obj->age + 50 <= moves ||
171		    obj->otyp == DEAD_COCKATRICE)
172			? POISON : CADAVER
173	    );
174	default:
175	    if(!obj->cursed) return(APPORT);
176	    /* fall into next case */
177	case BALL_SYM:
178	case CHAIN_SYM:
179	case ROCK_SYM:
180	    return(UNDEF);
181	}
182}
183
184/* return 0 (no move), 1 (move) or 2 (dead) */
185int
186dog_move(struct monst *mtmp, int after)
187{
188	int nx, ny, omx, omy, appr, nearer, j;
189	int udist, chi, i, whappr;
190	struct monst *mtmp2;
191	struct permonst *mdat = mtmp->data;
192	struct edog *edog = EDOG(mtmp);
193	struct obj *obj;
194	struct trap *trap;
195	xchar cnt, chcnt, nix, niy;
196	schar dogroom, uroom;
197	xchar gx, gy, gtyp, otyp;	/* current goal */
198	coord poss[9];
199	int info[9];
200#define GDIST(x,y) ((x-gx)*(x-gx) + (y-gy)*(y-gy))
201#define DDIST(x,y) ((x-omx)*(x-omx) + (y-omy)*(y-omy))
202
203	if(moves <= edog->eattime) return(0);	/* dog is still eating */
204	omx = mtmp->mx;
205	omy = mtmp->my;
206	whappr = (moves - EDOG(mtmp)->whistletime < 5);
207	if(moves > edog->hungrytime + 500 && !mtmp->mconf){
208		mtmp->mconf = 1;
209		mtmp->mhpmax /= 3;
210		if(mtmp->mhp > mtmp->mhpmax)
211			mtmp->mhp = mtmp->mhpmax;
212		if(cansee(omx,omy))
213			pline("%s is confused from hunger.", Monnam(mtmp));
214		else	pline("You feel worried about %s.", monnam(mtmp));
215	} else
216	if(moves > edog->hungrytime + 750 || mtmp->mhp < 1){
217		if(cansee(omx,omy))
218			pline("%s dies from hunger.", Monnam(mtmp));
219		else
220		pline("You have a sad feeling for a moment, then it passes.");
221		mondied(mtmp);
222		return(2);
223	}
224	dogroom = inroom(omx,omy);
225	uroom = inroom(u.ux,u.uy);
226	udist = dist(omx,omy);
227
228	/* maybe we tamed him while being swallowed --jgm */
229	if(!udist) return(0);
230
231	/* if we are carrying sth then we drop it (perhaps near @) */
232	/* Note: if apport == 1 then our behaviour is independent of udist */
233	if(mtmp->minvent){
234		if(!rn2(udist) || !rn2((int) edog->apport))
235		if(rn2(10) < edog->apport){
236			relobj(mtmp, (int) mtmp->minvis);
237			if(edog->apport > 1) edog->apport--;
238			edog->dropdist = udist;		/* hpscdi!jon */
239			edog->droptime = moves;
240		}
241	} else {
242		if ((obj = o_at(omx,omy)))
243			if(!strchr("0_", obj->olet)){
244				if((otyp = dogfood(obj)) <= CADAVER){
245					nix = omx;
246					niy = omy;
247					goto eatobj;
248				}
249				if (obj->owt < 10*mtmp->data->mlevel)
250					if (rn2(20) < edog->apport+3)
251						if (rn2(udist) || !rn2((int) edog->apport)){
252							freeobj(obj);
253							unpobj(obj);
254							/* if(levl[omx][omy].scrsym == obj->olet)
255								newsym(omx,omy); */
256							mpickobj(mtmp,obj);
257						}
258			}
259	}
260
261	/* first we look for food */
262	gtyp = UNDEF;	/* no goal as yet */
263	gx = gy = 0;
264	for(obj = fobj; obj; obj = obj->nobj) {
265		otyp = dogfood(obj);
266		if(otyp > gtyp || otyp == UNDEF) continue;
267		if(inroom(obj->ox,obj->oy) != dogroom) continue;
268		if(otyp < MANFOOD &&
269		 (dogroom >= 0 || DDIST(obj->ox,obj->oy) < 10)) {
270			if(otyp < gtyp || (otyp == gtyp &&
271				DDIST(obj->ox,obj->oy) < DDIST(gx,gy))){
272				gx = obj->ox;
273				gy = obj->oy;
274				gtyp = otyp;
275			}
276		} else
277		if(gtyp == UNDEF && dogroom >= 0 &&
278		   uroom == dogroom &&
279		   !mtmp->minvent && edog->apport > rn2(8)){
280			gx = obj->ox;
281			gy = obj->oy;
282			gtyp = APPORT;
283		}
284	}
285	if(gtyp == UNDEF ||
286	  (gtyp != DOGFOOD && gtyp != APPORT && moves < edog->hungrytime)){
287		if(dogroom < 0 || dogroom == uroom){
288			gx = u.ux;
289			gy = u.uy;
290#ifndef QUEST
291		} else {
292			int tmp = rooms[(int)dogroom].fdoor;
293			    cnt = rooms[(int)dogroom].doorct;
294
295			gx = gy = FAR;	/* random, far away */
296			while(cnt--){
297			    if(dist(gx,gy) >
298				dist(doors[tmp].x, doors[tmp].y)){
299					gx = doors[tmp].x;
300					gy = doors[tmp].y;
301				}
302				tmp++;
303			}
304			/* here gx == FAR e.g. when dog is in a vault */
305			if(gx == FAR || (gx == omx && gy == omy)){
306				gx = u.ux;
307				gy = u.uy;
308			}
309#endif /* QUEST */
310		}
311		appr = (udist >= 9) ? 1 : (mtmp->mflee) ? -1 : 0;
312		if(after && udist <= 4 && gx == u.ux && gy == u.uy)
313			return(0);
314		if(udist > 1){
315			if (!IS_ROOM(levl[(int)u.ux][(int)u.uy].typ) || !rn2(4) ||
316			   whappr ||
317			   (mtmp->minvent && rn2((int) edog->apport)))
318				appr = 1;
319		}
320		/* if you have dog food he'll follow you more closely */
321		if (appr == 0) {
322			obj = invent;
323			while(obj){
324				if(obj->otyp == TRIPE_RATION){
325					appr = 1;
326					break;
327				}
328				obj = obj->nobj;
329			}
330		}
331	} else	appr = 1;	/* gtyp != UNDEF */
332	if(mtmp->mconf) appr = 0;
333
334	if(gx == u.ux && gy == u.uy && (dogroom != uroom || dogroom < 0)){
335	coord *cp;
336		cp = gettrack(omx,omy);
337		if(cp){
338			gx = cp->x;
339			gy = cp->y;
340		}
341	}
342
343	nix = omx;
344	niy = omy;
345	cnt = mfndpos(mtmp,poss,info,ALLOW_M | ALLOW_TRAPS);
346	chcnt = 0;
347	chi = -1;
348	for(i=0; i<cnt; i++){
349		nx = poss[i].x;
350		ny = poss[i].y;
351		if(info[i] & ALLOW_M){
352			mtmp2 = m_at(nx,ny);
353			if(mtmp2->data->mlevel >= mdat->mlevel+2 ||
354			  mtmp2->data->mlet == 'c')
355				continue;
356			if(after) return(0); /* hit only once each move */
357
358			if(hitmm(mtmp, mtmp2) == 1 && rn2(4) &&
359			  mtmp2->mlstmv != moves &&
360			  hitmm(mtmp2,mtmp) == 2) return(2);
361			return(0);
362		}
363
364		/* dog avoids traps */
365		/* but perhaps we have to pass a trap in order to follow @ */
366		if((info[i] & ALLOW_TRAPS) && (trap = t_at(nx,ny))){
367			if(!trap->tseen && rn2(40)) continue;
368			if(rn2(10)) continue;
369		}
370
371		/* dog eschewes cursed objects */
372		/* but likes dog food */
373		obj = fobj;
374		while(obj){
375		    if(obj->ox != nx || obj->oy != ny)
376			goto nextobj;
377		    if(obj->cursed) goto nxti;
378		    if(obj->olet == FOOD_SYM &&
379			(otyp = dogfood(obj)) < MANFOOD &&
380			(otyp < ACCFOOD || edog->hungrytime <= moves)){
381			/* Note: our dog likes the food so much that he
382			might eat it even when it conceals a cursed object */
383			nix = nx;
384			niy = ny;
385			chi = i;
386		     eatobj:
387			edog->eattime =
388			    moves + obj->quan * objects[obj->otyp].oc_delay;
389			if(edog->hungrytime < moves)
390			    edog->hungrytime = moves;
391			edog->hungrytime +=
392			    5*obj->quan * objects[obj->otyp].nutrition;
393			mtmp->mconf = 0;
394			if(cansee(nix,niy))
395			    pline("%s ate %s.", Monnam(mtmp), doname(obj));
396			/* perhaps this was a reward */
397			if(otyp != CADAVER)
398			edog->apport += 200/(edog->dropdist+moves-edog->droptime);
399			delobj(obj);
400			goto newdogpos;
401		    }
402		nextobj:
403		    obj = obj->nobj;
404		}
405
406		for(j=0; j<MTSZ && j<cnt-1; j++)
407			if(nx == mtmp->mtrack[j].x && ny == mtmp->mtrack[j].y)
408				if(rn2(4*(cnt-j))) goto nxti;
409
410/* Some stupid C compilers cannot compute the whole expression at once. */
411		nearer = GDIST(nx,ny);
412		nearer -= GDIST(nix,niy);
413		nearer *= appr;
414		if((nearer == 0 && !rn2(++chcnt)) || nearer<0 ||
415			(nearer > 0 && !whappr &&
416				((omx == nix && omy == niy && !rn2(3))
417				|| !rn2(12))
418			)){
419			nix = nx;
420			niy = ny;
421			if(nearer < 0) chcnt = 0;
422			chi = i;
423		}
424	nxti:	;
425	}
426newdogpos:
427	if(nix != omx || niy != omy){
428		if(info[chi] & ALLOW_U){
429			(void) hitu(mtmp, d(mdat->damn, mdat->damd)+1);
430			return(0);
431		}
432		mtmp->mx = nix;
433		mtmp->my = niy;
434		for(j=MTSZ-1; j>0; j--) mtmp->mtrack[j] = mtmp->mtrack[j-1];
435		mtmp->mtrack[0].x = omx;
436		mtmp->mtrack[0].y = omy;
437	}
438	if(mintrap(mtmp) == 2)	/* he died */
439		return(2);
440	pmon(mtmp);
441	return(1);
442}
443
444/* return roomnumber or -1 */
445int
446inroom(xchar x, xchar y)
447{
448#ifndef QUEST
449	struct mkroom *croom = &rooms[0];
450	while(croom->hx >= 0){
451		if(croom->hx >= x-1 && croom->lx <= x+1 &&
452		   croom->hy >= y-1 && croom->ly <= y+1)
453			return(croom - rooms);
454		croom++;
455	}
456#endif /* QUEST */
457	return(-1);	/* not in room or on door */
458}
459
460int
461tamedog(struct monst *mtmp, struct obj *obj)
462{
463	struct monst *mtmp2;
464
465	if(flags.moonphase == FULL_MOON && night() && rn2(6))
466		return(0);
467
468	/* If we cannot tame him, at least he's no longer afraid. */
469	mtmp->mflee = 0;
470	mtmp->mfleetim = 0;
471	if(mtmp->mtame || mtmp->mfroz ||
472#ifndef NOWORM
473		mtmp->wormno ||
474#endif /* NOWORM */
475		mtmp->isshk || mtmp->isgd || strchr(" &@12", mtmp->data->mlet))
476		return(0); /* no tame long worms? */
477	if(obj) {
478		if(dogfood(obj) >= MANFOOD) return(0);
479		if(cansee(mtmp->mx,mtmp->my)){
480			pline("%s devours the %s.", Monnam(mtmp),
481				objects[obj->otyp].oc_name);
482		}
483		obfree(obj, (struct obj *) 0);
484	}
485	mtmp2 = newmonst(sizeof(struct edog) + mtmp->mnamelth);
486	*mtmp2 = *mtmp;
487	mtmp2->mxlth = sizeof(struct edog);
488	if(mtmp->mnamelth)
489		(void) strlcpy(NAME(mtmp2), NAME(mtmp), mtmp2->mnamelth);
490	initedog(mtmp2);
491	replmon(mtmp,mtmp2);
492	return(1);
493}
494