xref: /dragonfly/games/hack/hack.shk.c (revision e1acdbad)
1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
2 /* hack.shk.c - version 1.0.3 */
3 /* $FreeBSD: src/games/hack/hack.shk.c,v 1.5 1999/11/16 10:26:37 marcel Exp $ */
4 /* $DragonFly: src/games/hack/hack.shk.c,v 1.3 2004/11/06 12:29:17 eirikn Exp $ */
5 
6 #include "hack.h"
7 #ifdef QUEST
8 int shlevel = 0;
9 struct monst *shopkeeper = 0;
10 struct obj *billobjs = 0;
11 obfree(obj,merge) struct obj *obj, *merge; {
12 	free((char *) obj);
13 }
14 inshop(){ return(0); }
15 shopdig(){}
16 addtobill(){}
17 subfrombill(){}
18 splitbill(){}
19 dopay(){ return(0); }
20 paybill(){}
21 doinvbill(){ return(0); }
22 shkdead(){}
23 shkcatch(){ return(0); }
24 shk_move(){ return(0); }
25 replshk(mtmp,mtmp2) struct monst *mtmp, *mtmp2; {}
26 char *shkname(){ return(""); }
27 
28 #else /* QUEST */
29 #include	"hack.mfndpos.h"
30 #include	"def.mkroom.h"
31 #include	"def.eshk.h"
32 
33 #define	ESHK(mon)	((struct eshk *)(&(mon->mextra[0])))
34 #define	NOTANGRY(mon)	mon->mpeaceful
35 #define	ANGRY(mon)	!NOTANGRY(mon)
36 
37 extern char plname[], *xname();
38 extern struct obj *o_on(), *bp_to_obj();
39 
40 /* Descriptor of current shopkeeper. Note that the bill need not be
41    per-shopkeeper, since it is valid only when in a shop. */
42 static struct monst *shopkeeper = 0;
43 static struct bill_x *bill;
44 static int shlevel = 0;	/* level of this shopkeeper */
45        struct obj *billobjs;	/* objects on bill with bp->useup */
46 				/* only accessed here and by save & restore */
47 static long int total;		/* filled by addupbill() */
48 static long int followmsg;	/* last time of follow message */
49 
50 /*
51 	invariants: obj->unpaid iff onbill(obj) [unless bp->useup]
52 		obj->quan <= bp->bquan
53  */
54 
55 
56 char shtypes[] = {	/* 8 shoptypes: 7 specialized, 1 mixed */
57 	RING_SYM, WAND_SYM, WEAPON_SYM, FOOD_SYM, SCROLL_SYM,
58 	POTION_SYM, ARMOR_SYM, 0
59 };
60 
61 static char *shopnam[] = {
62 	"engagement ring", "walking cane", "antique weapon",
63 	"delicatessen", "second hand book", "liquor",
64 	"used armor", "assorted antiques"
65 };
66 
67 char *
68 shkname(mtmp)				/* called in do_name.c */
69 struct monst *mtmp;
70 {
71 	return(ESHK(mtmp)->shknam);
72 }
73 
74 static void setpaid();
75 
76 shkdead(mtmp)				/* called in mon.c */
77 struct monst *mtmp;
78 {
79 	struct eshk *eshk = ESHK(mtmp);
80 
81 	if(eshk->shoplevel == dlevel)
82 		rooms[eshk->shoproom].rtype = 0;
83 	if(mtmp == shopkeeper) {
84 		setpaid();
85 		shopkeeper = 0;
86 		bill = (struct bill_x *) -1000;	/* dump core when referenced */
87 	}
88 }
89 
90 replshk(mtmp,mtmp2)
91 struct monst *mtmp, *mtmp2;
92 {
93 	if(mtmp == shopkeeper) {
94 		shopkeeper = mtmp2;
95 		bill = &(ESHK(shopkeeper)->bill[0]);
96 	}
97 }
98 
99 static void
100 setpaid(){	/* caller has checked that shopkeeper exists */
101 		/* either we paid or left the shop or he just died */
102 struct obj *obj;
103 struct monst *mtmp;
104 	for(obj = invent; obj; obj = obj->nobj)
105 		obj->unpaid = 0;
106 	for(obj = fobj; obj; obj = obj->nobj)
107 		obj->unpaid = 0;
108 	for(obj = fcobj; obj; obj = obj->nobj)
109 		obj->unpaid = 0;
110 	for(mtmp = fmon; mtmp; mtmp = mtmp->nmon)
111 		for(obj = mtmp->minvent; obj; obj = obj->nobj)
112 			obj->unpaid = 0;
113 	for(mtmp = fallen_down; mtmp; mtmp = mtmp->nmon)
114 		for(obj = mtmp->minvent; obj; obj = obj->nobj)
115 			obj->unpaid = 0;
116 	while(obj = billobjs){
117 		billobjs = obj->nobj;
118 		free((char *) obj);
119 	}
120 	ESHK(shopkeeper)->billct = 0;
121 }
122 
123 static
124 addupbill(){	/* delivers result in total */
125 		/* caller has checked that shopkeeper exists */
126 int ct = ESHK(shopkeeper)->billct;
127 struct bill_x *bp = bill;
128 	total = 0;
129 	while(ct--){
130 		total += bp->price * bp->bquan;
131 		bp++;
132 	}
133 }
134 
135 inshop(){
136 int roomno = inroom(u.ux,u.uy);
137 
138 	static void findshk();
139 
140 	/* Did we just leave a shop? */
141 	if(u.uinshop &&
142 	    (u.uinshop != roomno + 1 || shlevel != dlevel || !shopkeeper)) {
143 		if(shopkeeper) {
144 		    if(ESHK(shopkeeper)->billct) {
145  			if(inroom(shopkeeper->mx, shopkeeper->my)
146  			    == u.uinshop - 1)	/* ab@unido */
147  			    pline("Somehow you escaped the shop without paying!");
148 			addupbill();
149 			pline("You stole for a total worth of %ld zorkmids.",
150 				total);
151 			ESHK(shopkeeper)->robbed += total;
152 			setpaid();
153 			if((rooms[ESHK(shopkeeper)->shoproom].rtype == GENERAL)
154 			    == (rn2(3) == 0))
155 			    ESHK(shopkeeper)->following = 1;
156 		    }
157 		    shopkeeper = 0;
158 		    shlevel = 0;
159 		}
160  		u.uinshop = 0;
161 	}
162 
163 	/* Did we just enter a zoo of some kind? */
164 	if(roomno >= 0) {
165 		int rt = rooms[roomno].rtype;
166 		struct monst *mtmp;
167 		if(rt == ZOO) {
168 			pline("Welcome to David's treasure zoo!");
169 		} else
170 		if(rt == SWAMP) {
171 			pline("It looks rather muddy down here.");
172 		} else
173 		if(rt == MORGUE) {
174 			if(midnight())
175 				pline("Go away! Go away!");
176 			else
177 				pline("You get an uncanny feeling ...");
178 		} else
179 			rt = 0;
180 		if(rt != 0) {
181 			rooms[roomno].rtype = 0;
182 			for(mtmp = fmon; mtmp; mtmp = mtmp->nmon)
183 				if(rt != ZOO || !rn2(3))
184 					mtmp->msleep = 0;
185 		}
186 	}
187 
188 	/* Did we just enter a shop? */
189 	if(roomno >= 0 && rooms[roomno].rtype >= 8) {
190 	    if(shlevel != dlevel || !shopkeeper
191 				 || ESHK(shopkeeper)->shoproom != roomno)
192 		findshk(roomno);
193 	    if(!shopkeeper) {
194 		rooms[roomno].rtype = 0;
195 		u.uinshop = 0;
196 	    } else if(!u.uinshop){
197 		if(!ESHK(shopkeeper)->visitct ||
198 		    strncmp(ESHK(shopkeeper)->customer, plname, PL_NSIZ)){
199 
200 		    /* He seems to be new here */
201 		    ESHK(shopkeeper)->visitct = 0;
202 		    ESHK(shopkeeper)->following = 0;
203 		    (void) strncpy(ESHK(shopkeeper)->customer,plname,PL_NSIZ);
204 		    NOTANGRY(shopkeeper) = 1;
205 		}
206 		if(!ESHK(shopkeeper)->following) {
207 		    boolean box, pick;
208 
209 		    pline("Hello %s! Welcome%s to %s's %s shop!",
210 			plname,
211 			ESHK(shopkeeper)->visitct++ ? " again" : "",
212 			shkname(shopkeeper),
213 			shopnam[rooms[ESHK(shopkeeper)->shoproom].rtype - 8] );
214 		    box = carrying(ICE_BOX);
215 		    pick = carrying(PICK_AXE);
216 		    if(box || pick) {
217 			if(dochug(shopkeeper)) {
218 				u.uinshop = 0;	/* he died moving */
219 				return(0);
220 			}
221 			pline("Will you please leave your %s outside?",
222 			    (box && pick) ? "box and pick-axe" :
223 			    box ? "box" : "pick-axe");
224 		    }
225 		}
226 		u.uinshop = roomno + 1;
227 	    }
228 	}
229 	return(u.uinshop);
230 }
231 
232 static void
233 findshk(roomno)
234 int roomno;
235 {
236 struct monst *mtmp;
237 	for(mtmp = fmon; mtmp; mtmp = mtmp->nmon)
238 	    if(mtmp->isshk && ESHK(mtmp)->shoproom == roomno
239 			   && ESHK(mtmp)->shoplevel == dlevel) {
240 		shopkeeper = mtmp;
241 		bill = &(ESHK(shopkeeper)->bill[0]);
242 		shlevel = dlevel;
243 		if(ANGRY(shopkeeper) &&
244 		   strncmp(ESHK(shopkeeper)->customer,plname,PL_NSIZ))
245 			NOTANGRY(shopkeeper) = 1;
246 		/* billobjs = 0; -- this is wrong if we save in a shop */
247 		/* (and it is harmless to have too many things in billobjs) */
248 		return;
249 	}
250 	shopkeeper = 0;
251 	shlevel = 0;
252 	bill = (struct bill_x *) -1000;	/* dump core when referenced */
253 }
254 
255 static struct bill_x *
256 onbill(obj) struct obj *obj; {
257 struct bill_x *bp;
258 	if(!shopkeeper) return(0);
259 	for(bp = bill; bp < &bill[ESHK(shopkeeper)->billct]; bp++)
260 		if(bp->bo_id == obj->o_id) {
261 			if(!obj->unpaid) pline("onbill: paid obj on bill?");
262 			return(bp);
263 		}
264 	if(obj->unpaid) pline("onbill: unpaid obj not on bill?");
265 	return(0);
266 }
267 
268 /* called with two args on merge */
269 obfree(obj,merge) struct obj *obj, *merge; {
270 struct bill_x *bp = onbill(obj);
271 struct bill_x *bpm;
272 	if(bp) {
273 		if(!merge){
274 			bp->useup = 1;
275 			obj->unpaid = 0;	/* only for doinvbill */
276 			obj->nobj = billobjs;
277 			billobjs = obj;
278 			return;
279 		}
280 		bpm = onbill(merge);
281 		if(!bpm){
282 			/* this used to be a rename */
283 			impossible("obfree: not on bill??");
284 			return;
285 		} else {
286 			/* this was a merger */
287 			bpm->bquan += bp->bquan;
288 			ESHK(shopkeeper)->billct--;
289 			*bp = bill[ESHK(shopkeeper)->billct];
290 		}
291 	}
292 	free((char *) obj);
293 }
294 
295 static
296 pay(tmp,shkp)
297 long tmp;
298 struct monst *shkp;
299 {
300 	long robbed = ESHK(shkp)->robbed;
301 
302 	u.ugold -= tmp;
303 	shkp->mgold += tmp;
304 	flags.botl = 1;
305 	if(robbed) {
306 		robbed -= tmp;
307 		if(robbed < 0) robbed = 0;
308 		ESHK(shkp)->robbed = robbed;
309 	}
310 }
311 
312 dopay(){
313 long ltmp;
314 struct bill_x *bp;
315 struct monst *shkp;
316 int pass, tmp;
317 
318 	static int dopayobj();
319 
320 	multi = 0;
321 	(void) inshop();
322 	for(shkp = fmon; shkp; shkp = shkp->nmon)
323 		if(shkp->isshk && dist(shkp->mx,shkp->my) < 3)
324 			break;
325 	if(!shkp && u.uinshop &&
326 	   inroom(shopkeeper->mx,shopkeeper->my) == ESHK(shopkeeper)->shoproom)
327 		shkp = shopkeeper;
328 
329 	if(!shkp) {
330 		pline("There is nobody here to receive your payment.");
331 		return(0);
332 	}
333 	ltmp = ESHK(shkp)->robbed;
334 	if(shkp != shopkeeper && NOTANGRY(shkp)) {
335 		if(!ltmp) {
336 			pline("You do not owe %s anything.", monnam(shkp));
337 		} else
338 		if(!u.ugold) {
339 			pline("You have no money.");
340 		} else {
341 		    long ugold = u.ugold;
342 
343 		    if(u.ugold > ltmp) {
344 			pline("You give %s the %ld gold pieces he asked for.",
345 				monnam(shkp), ltmp);
346 			pay(ltmp, shkp);
347 		    } else {
348 			pline("You give %s all your gold.", monnam(shkp));
349 			pay(u.ugold, shkp);
350 		    }
351 		    if(ugold < ltmp/2) {
352 			pline("Unfortunately, he doesn't look satisfied.");
353 		    } else {
354 			ESHK(shkp)->robbed = 0;
355 			ESHK(shkp)->following = 0;
356 			if(ESHK(shkp)->shoplevel != dlevel) {
357 			/* For convenience's sake, let him disappear */
358 			    shkp->minvent = 0;		/* %% */
359 			    shkp->mgold = 0;
360 			    mondead(shkp);
361 			}
362 		    }
363 		}
364 		return(1);
365 	}
366 
367 	if(!ESHK(shkp)->billct){
368 		pline("You do not owe %s anything.", monnam(shkp));
369 		if(!u.ugold){
370 			pline("Moreover, you have no money.");
371 			return(1);
372 		}
373 		if(ESHK(shkp)->robbed){
374 #define min(a,b)	((a<b)?a:b)
375 		    pline("But since his shop has been robbed recently,");
376 		    pline("you %srepay %s's expenses.",
377 		      (u.ugold < ESHK(shkp)->robbed) ? "partially " : "",
378 		      monnam(shkp));
379 		    pay(min(u.ugold, ESHK(shkp)->robbed), shkp);
380 		    ESHK(shkp)->robbed = 0;
381 		    return(1);
382 		}
383 		if(ANGRY(shkp)){
384 			pline("But in order to appease %s,",
385 				amonnam(shkp, "angry"));
386 			if(u.ugold >= 1000){
387 				ltmp = 1000;
388 				pline(" you give him 1000 gold pieces.");
389 			} else {
390 				ltmp = u.ugold;
391 				pline(" you give him all your money.");
392 			}
393 			pay(ltmp, shkp);
394 			if(strncmp(ESHK(shkp)->customer, plname, PL_NSIZ)
395 			   || rn2(3)){
396 				pline("%s calms down.", Monnam(shkp));
397 				NOTANGRY(shkp) = 1;
398 			} else	pline("%s is as angry as ever.",
399 					Monnam(shkp));
400 		}
401 		return(1);
402 	}
403 	if(shkp != shopkeeper) {
404 		impossible("dopay: not to shopkeeper?");
405 		if(shopkeeper) setpaid();
406 		return(0);
407 	}
408 	for(pass = 0; pass <= 1; pass++) {
409 		tmp = 0;
410 		while(tmp < ESHK(shopkeeper)->billct) {
411 			bp = &bill[tmp];
412 			if(!pass && !bp->useup) {
413 				tmp++;
414 				continue;
415 			}
416 			if(!dopayobj(bp)) return(1);
417 			bill[tmp] = bill[--ESHK(shopkeeper)->billct];
418 		}
419 	}
420 	pline("Thank you for shopping in %s's %s store!",
421 		shkname(shopkeeper),
422 		shopnam[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]);
423 	NOTANGRY(shopkeeper) = 1;
424 	return(1);
425 }
426 
427 /* return 1 if paid successfully */
428 /*        0 if not enough money */
429 /*       -1 if object could not be found (but was paid) */
430 static
431 dopayobj(bp) struct bill_x *bp; {
432 struct obj *obj;
433 long ltmp;
434 
435 	/* find the object on one of the lists */
436 	obj = bp_to_obj(bp);
437 
438 	if(!obj) {
439 		impossible("Shopkeeper administration out of order.");
440 		setpaid();	/* be nice to the player */
441 		return(0);
442 	}
443 
444 	if(!obj->unpaid && !bp->useup){
445 		impossible("Paid object on bill??");
446 		return(1);
447 	}
448 	obj->unpaid = 0;
449 	ltmp = bp->price * bp->bquan;
450 	if(ANGRY(shopkeeper)) ltmp += ltmp/3;
451 	if(u.ugold < ltmp){
452 		pline("You don't have gold enough to pay %s.",
453 			doname(obj));
454 		obj->unpaid = 1;
455 		return(0);
456 	}
457 	pay(ltmp, shopkeeper);
458 	pline("You bought %s for %ld gold piece%s.",
459 		doname(obj), ltmp, plur(ltmp));
460 	if(bp->useup) {
461 		struct obj *otmp = billobjs;
462 		if(obj == billobjs)
463 			billobjs = obj->nobj;
464 		else {
465 			while(otmp && otmp->nobj != obj) otmp = otmp->nobj;
466 			if(otmp) otmp->nobj = obj->nobj;
467 			else pline("Error in shopkeeper administration.");
468 		}
469 		free((char *) obj);
470 	}
471 	return(1);
472 }
473 
474 /* routine called after dying (or quitting) with nonempty bill */
475 paybill(){
476 	if(shlevel == dlevel && shopkeeper && ESHK(shopkeeper)->billct){
477 		addupbill();
478 		if(total > u.ugold){
479 			shopkeeper->mgold += u.ugold;
480 			u.ugold = 0;
481 		pline("%s comes and takes all your possessions.",
482 			Monnam(shopkeeper));
483 		} else {
484 			u.ugold -= total;
485 			shopkeeper->mgold += total;
486 	pline("%s comes and takes the %ld zorkmids you owed him.",
487 		Monnam(shopkeeper), total);
488 		}
489 		setpaid();	/* in case we create bones */
490 	}
491 }
492 
493 /* find obj on one of the lists */
494 struct obj *
495 bp_to_obj(bp)
496 struct bill_x *bp;
497 {
498 	struct obj *obj;
499 	struct monst *mtmp;
500 	unsigned id = bp->bo_id;
501 
502 	if(bp->useup)
503 		obj = o_on(id, billobjs);
504 	else if(!(obj = o_on(id, invent)) &&
505 		!(obj = o_on(id, fobj)) &&
506 		!(obj = o_on(id, fcobj))) {
507 		    for(mtmp = fmon; mtmp; mtmp = mtmp->nmon)
508 			if(obj = o_on(id, mtmp->minvent))
509 			    break;
510 		    for(mtmp = fallen_down; mtmp; mtmp = mtmp->nmon)
511 			if(obj = o_on(id, mtmp->minvent))
512 			    break;
513 		}
514 	return(obj);
515 }
516 
517 static int getprice();
518 
519 /* called in hack.c when we pickup an object */
520 addtobill(obj) struct obj *obj; {
521 struct bill_x *bp;
522 	if(!inshop() ||
523 	(u.ux == ESHK(shopkeeper)->shk.x && u.uy == ESHK(shopkeeper)->shk.y) ||
524 	(u.ux == ESHK(shopkeeper)->shd.x && u.uy == ESHK(shopkeeper)->shd.y) ||
525 		onbill(obj) /* perhaps we threw it away earlier */
526 	  ) return;
527 	if(ESHK(shopkeeper)->billct == BILLSZ){
528 		pline("You got that for free!");
529 		return;
530 	}
531 	bp = &bill[ESHK(shopkeeper)->billct];
532 	bp->bo_id = obj->o_id;
533 	bp->bquan = obj->quan;
534 	bp->useup = 0;
535 	bp->price = getprice(obj);
536 	ESHK(shopkeeper)->billct++;
537 	obj->unpaid = 1;
538 }
539 
540 splitbill(obj,otmp) struct obj *obj, *otmp; {
541 	/* otmp has been split off from obj */
542 struct bill_x *bp;
543 int tmp;
544 	bp = onbill(obj);
545 	if(!bp) {
546 		impossible("splitbill: not on bill?");
547 		return;
548 	}
549 	if(bp->bquan < otmp->quan) {
550 		impossible("Negative quantity on bill??");
551 	}
552 	if(bp->bquan == otmp->quan) {
553 		impossible("Zero quantity on bill??");
554 	}
555 	bp->bquan -= otmp->quan;
556 
557 	/* addtobill(otmp); */
558 	if(ESHK(shopkeeper)->billct == BILLSZ) otmp->unpaid = 0;
559 	else {
560 		tmp = bp->price;
561 		bp = &bill[ESHK(shopkeeper)->billct];
562 		bp->bo_id = otmp->o_id;
563 		bp->bquan = otmp->quan;
564 		bp->useup = 0;
565 		bp->price = tmp;
566 		ESHK(shopkeeper)->billct++;
567 	}
568 }
569 
570 subfrombill(obj) struct obj *obj; {
571 long ltmp;
572 int tmp;
573 struct obj *otmp;
574 struct bill_x *bp;
575 	if(!inshop() || (u.ux == ESHK(shopkeeper)->shk.x && u.uy == ESHK(shopkeeper)->shk.y) ||
576 		(u.ux == ESHK(shopkeeper)->shd.x && u.uy == ESHK(shopkeeper)->shd.y))
577 		return;
578 	if((bp = onbill(obj)) != 0){
579 		obj->unpaid = 0;
580 		if(bp->bquan > obj->quan){
581 			otmp = newobj(0);
582 			*otmp = *obj;
583 			bp->bo_id = otmp->o_id = flags.ident++;
584 			otmp->quan = (bp->bquan -= obj->quan);
585 			otmp->owt = 0;	/* superfluous */
586 			otmp->onamelth = 0;
587 			bp->useup = 1;
588 			otmp->nobj = billobjs;
589 			billobjs = otmp;
590 			return;
591 		}
592 		ESHK(shopkeeper)->billct--;
593 		*bp = bill[ESHK(shopkeeper)->billct];
594 		return;
595 	}
596 	if(obj->unpaid){
597 		pline("%s didn't notice.", Monnam(shopkeeper));
598 		obj->unpaid = 0;
599 		return;		/* %% */
600 	}
601 	/* he dropped something of his own - probably wants to sell it */
602 	if(shopkeeper->msleep || shopkeeper->mfroz ||
603 		inroom(shopkeeper->mx,shopkeeper->my) != ESHK(shopkeeper)->shoproom)
604 		return;
605 	if(ESHK(shopkeeper)->billct == BILLSZ ||
606 	  ((tmp = shtypes[rooms[ESHK(shopkeeper)->shoproom].rtype-8]) && tmp != obj->olet)
607 	  || index("_0", obj->olet)) {
608 		pline("%s seems not interested.", Monnam(shopkeeper));
609 		return;
610 	}
611 	ltmp = getprice(obj) * obj->quan;
612 	if(ANGRY(shopkeeper)) {
613 		ltmp /= 3;
614 		NOTANGRY(shopkeeper) = 1;
615 	} else	ltmp /= 2;
616 	if(ESHK(shopkeeper)->robbed){
617 		if((ESHK(shopkeeper)->robbed -= ltmp) < 0)
618 			ESHK(shopkeeper)->robbed = 0;
619 pline("Thank you for your contribution to restock this recently plundered shop.");
620 		return;
621 	}
622 	if(ltmp > shopkeeper->mgold)
623 		ltmp = shopkeeper->mgold;
624 	pay(-ltmp, shopkeeper);
625 	if(!ltmp)
626 	pline("%s gladly accepts %s but cannot pay you at present.",
627 		Monnam(shopkeeper), doname(obj));
628 	else
629 	pline("You sold %s and got %ld gold piece%s.", doname(obj), ltmp,
630 		plur(ltmp));
631 }
632 
633 doinvbill(mode)
634 int mode;		/* 0: deliver count 1: paged */
635 {
636 	struct bill_x *bp;
637 	struct obj *obj;
638 	long totused, thisused;
639 	char buf[BUFSZ];
640 
641 	if(mode == 0) {
642 	    int cnt = 0;
643 
644 	    if(shopkeeper)
645 		for(bp = bill; bp - bill < ESHK(shopkeeper)->billct; bp++)
646 		    if(bp->useup ||
647 		      ((obj = bp_to_obj(bp)) && obj->quan < bp->bquan))
648 			cnt++;
649 	    return(cnt);
650 	}
651 
652 	if(!shopkeeper) {
653 		impossible("doinvbill: no shopkeeper?");
654 		return(0);
655 	}
656 
657 	set_pager(0);
658 	if(page_line("Unpaid articles already used up:") || page_line(""))
659 	    goto quit;
660 
661 	totused = 0;
662 	for(bp = bill; bp - bill < ESHK(shopkeeper)->billct; bp++) {
663 	    obj = bp_to_obj(bp);
664 	    if(!obj) {
665 		impossible("Bad shopkeeper administration.");
666 		goto quit;
667 	    }
668 	    if(bp->useup || bp->bquan > obj->quan) {
669 		int cnt, oquan, uquan;
670 
671 		oquan = obj->quan;
672 		uquan = (bp->useup ? bp->bquan : bp->bquan - oquan);
673 		thisused = bp->price * uquan;
674 		totused += thisused;
675 		obj->quan = uquan;		/* cheat doname */
676 		(void) sprintf(buf, "x -  %s", doname(obj));
677 		obj->quan = oquan;		/* restore value */
678 		for(cnt = 0; buf[cnt]; cnt++);
679 		while(cnt < 50)
680 			buf[cnt++] = ' ';
681 		(void) sprintf(&buf[cnt], " %5ld zorkmids", thisused);
682 		if(page_line(buf))
683 			goto quit;
684 	    }
685 	}
686 	(void) sprintf(buf, "Total:%50ld zorkmids", totused);
687 	if(page_line("") || page_line(buf))
688 		goto quit;
689 	set_pager(1);
690 	return(0);
691 quit:
692 	set_pager(2);
693 	return(0);
694 }
695 
696 static
697 getprice(obj) struct obj *obj; {
698 int tmp, ac;
699 	static int realhunger();
700 
701 	switch(obj->olet){
702 	case AMULET_SYM:
703 		tmp = 10*rnd(500);
704 		break;
705 	case TOOL_SYM:
706 		tmp = 10*rnd((obj->otyp == EXPENSIVE_CAMERA) ? 150 : 30);
707 		break;
708 	case RING_SYM:
709 		tmp = 10*rnd(100);
710 		break;
711 	case WAND_SYM:
712 		tmp = 10*rnd(100);
713 		break;
714 	case SCROLL_SYM:
715 		tmp = 10*rnd(50);
716 #ifdef MAIL
717 		if(obj->otyp == SCR_MAIL)
718 			tmp = rnd(5);
719 #endif /* MAIL */
720 		break;
721 	case POTION_SYM:
722 		tmp = 10*rnd(50);
723 		break;
724 	case FOOD_SYM:
725 		tmp = 10*rnd(5 + (2000/realhunger()));
726 		break;
727 	case GEM_SYM:
728 		tmp = 10*rnd(20);
729 		break;
730 	case ARMOR_SYM:
731 		ac = ARM_BONUS(obj);
732 		if(ac <= -10)		/* probably impossible */
733 			ac = -9;
734 		tmp = 100 + ac*ac*rnd(10+ac);
735 		break;
736 	case WEAPON_SYM:
737 		if(obj->otyp < BOOMERANG)
738 			tmp = 5*rnd(10);
739 		else if(obj->otyp == LONG_SWORD ||
740 			obj->otyp == TWO_HANDED_SWORD)
741 			tmp = 10*rnd(150);
742 		else	tmp = 10*rnd(75);
743 		break;
744 	case CHAIN_SYM:
745 		pline("Strange ..., carrying a chain?");
746 	case BALL_SYM:
747 		tmp = 10;
748 		break;
749 	default:
750 		tmp = 10000;
751 	}
752 	return(tmp);
753 }
754 
755 static
756 realhunger(){	/* not completely foolproof */
757 int tmp = u.uhunger;
758 struct obj *otmp = invent;
759 	while(otmp){
760 		if(otmp->olet == FOOD_SYM && !otmp->unpaid)
761 			tmp += objects[otmp->otyp].nutrition;
762 		otmp = otmp->nobj;
763 	}
764 	return((tmp <= 0) ? 1 : tmp);
765 }
766 
767 shkcatch(obj)
768 struct obj *obj;
769 {
770 	struct monst *shkp = shopkeeper;
771 
772 	if(u.uinshop && shkp && !shkp->mfroz && !shkp->msleep &&
773 	    u.dx && u.dy &&
774 	    inroom(u.ux+u.dx, u.uy+u.dy) + 1 == u.uinshop &&
775 	    shkp->mx == ESHK(shkp)->shk.x && shkp->my == ESHK(shkp)->shk.y &&
776 	    u.ux == ESHK(shkp)->shd.x && u.uy == ESHK(shkp)->shd.y) {
777 		pline("%s nimbly catches the %s.", Monnam(shkp), xname(obj));
778 		obj->nobj = shkp->minvent;
779 		shkp->minvent = obj;
780 		return(1);
781 	}
782 	return(0);
783 }
784 
785 /*
786  * shk_move: return 1: he moved  0: he didnt  -1: let m_move do it
787  */
788 shk_move(shkp)
789 struct monst *shkp;
790 {
791 	struct monst *mtmp;
792 	struct permonst *mdat = shkp->data;
793 	xchar gx,gy,omx,omy,nx,ny,nix,niy;
794 	schar appr,i;
795 	int udist;
796 	int z;
797 	schar shkroom,chi,chcnt,cnt;
798 	boolean uondoor, satdoor, avoid, badinv;
799 	coord poss[9];
800 	int info[9];
801 	struct obj *ib = 0;
802 
803 	omx = shkp->mx;
804 	omy = shkp->my;
805 
806 	if((udist = dist(omx,omy)) < 3) {
807 		if(ANGRY(shkp)) {
808 			(void) hitu(shkp, d(mdat->damn, mdat->damd)+1);
809 			return(0);
810 		}
811 		if(ESHK(shkp)->following) {
812 			if(strncmp(ESHK(shkp)->customer, plname, PL_NSIZ)){
813 				pline("Hello %s! I was looking for %s.",
814 					plname, ESHK(shkp)->customer);
815 				ESHK(shkp)->following = 0;
816 				return(0);
817 			}
818 			if(!ESHK(shkp)->robbed) {	/* impossible? */
819 				ESHK(shkp)->following = 0;
820 				return(0);
821 			}
822 			if(moves > followmsg+4) {
823 				pline("Hello %s! Didn't you forget to pay?",
824 					plname);
825 				followmsg = moves;
826 			}
827 			if(udist < 2)
828 				return(0);
829 		}
830 	}
831 
832 	shkroom = inroom(omx,omy);
833 	appr = 1;
834 	gx = ESHK(shkp)->shk.x;
835 	gy = ESHK(shkp)->shk.y;
836 	satdoor = (gx == omx && gy == omy);
837 	if(ESHK(shkp)->following || ((z = holetime()) >= 0 && z*z <= udist)){
838 		gx = u.ux;
839 		gy = u.uy;
840 		if(shkroom < 0 || shkroom != inroom(u.ux,u.uy))
841 		    if(udist > 4)
842 			return(-1);	/* leave it to m_move */
843 	} else if(ANGRY(shkp)) {
844 		long saveBlind = Blind;
845 		Blind = 0;
846 		if(shkp->mcansee && !Invis && cansee(omx,omy)) {
847 			gx = u.ux;
848 			gy = u.uy;
849 		}
850 		Blind = saveBlind;
851 		avoid = FALSE;
852 	} else {
853 #define	GDIST(x,y)	((x-gx)*(x-gx)+(y-gy)*(y-gy))
854 		if(Invis)
855 		  avoid = FALSE;
856 		else {
857 		  uondoor = (u.ux == ESHK(shkp)->shd.x &&
858 				u.uy == ESHK(shkp)->shd.y);
859 		  if(uondoor) {
860 		    if(ESHK(shkp)->billct)
861 			pline("Hello %s! Will you please pay before leaving?",
862 				plname);
863 		    badinv = (carrying(PICK_AXE) || carrying(ICE_BOX));
864 		    if(satdoor && badinv)
865 			return(0);
866 		    avoid = !badinv;
867 		  } else {
868 		    avoid = (u.uinshop && dist(gx,gy) > 8);
869 		    badinv = FALSE;
870 		  }
871 
872 		  if(((!ESHK(shkp)->robbed && !ESHK(shkp)->billct) || avoid)
873 		  	&& GDIST(omx,omy) < 3){
874 		  	if(!badinv && !online(omx,omy))
875 				return(0);
876 		  	if(satdoor)
877 		  		appr = gx = gy = 0;
878 		  }
879 		}
880 	}
881 	if(omx == gx && omy == gy)
882 		return(0);
883 	if(shkp->mconf) {
884 		avoid = FALSE;
885 		appr = 0;
886 	}
887 	nix = omx;
888 	niy = omy;
889 	cnt = mfndpos(shkp,poss,info,ALLOW_SSM);
890 	if(avoid && uondoor) {		/* perhaps we cannot avoid him */
891 		for(i=0; i<cnt; i++)
892 			if(!(info[i] & NOTONL)) goto notonl_ok;
893 		avoid = FALSE;
894 	notonl_ok:
895 		;
896 	}
897 	chi = -1;
898 	chcnt = 0;
899 	for(i=0; i<cnt; i++){
900 		nx = poss[i].x;
901 		ny = poss[i].y;
902 	   	if(levl[nx][ny].typ == ROOM
903 		|| shkroom != ESHK(shkp)->shoproom
904 		|| ESHK(shkp)->following) {
905 #ifdef STUPID
906 		    /* cater for stupid compilers */
907 		    int zz;
908 #endif /* STUPID */
909 		    if(uondoor && (ib = sobj_at(ICE_BOX, nx, ny))) {
910 			nix = nx; niy = ny; chi = i; break;
911 		    }
912 		    if(avoid && (info[i] & NOTONL))
913 			continue;
914 		    if((!appr && !rn2(++chcnt)) ||
915 #ifdef STUPID
916 			(appr && (zz = GDIST(nix,niy)) && zz > GDIST(nx,ny))
917 #else
918 			(appr && GDIST(nx,ny) < GDIST(nix,niy))
919 #endif /* STUPID */
920 			) {
921 			    nix = nx;
922 			    niy = ny;
923 			    chi = i;
924 		    }
925 		}
926 	}
927 	if(nix != omx || niy != omy){
928 		if(info[chi] & ALLOW_M){
929 			mtmp = m_at(nix,niy);
930 			if(hitmm(shkp,mtmp) == 1 && rn2(3) &&
931 			   hitmm(mtmp,shkp) == 2) return(2);
932 			return(0);
933 		} else if(info[chi] & ALLOW_U){
934 			(void) hitu(shkp, d(mdat->damn, mdat->damd)+1);
935 			return(0);
936 		}
937 		shkp->mx = nix;
938 		shkp->my = niy;
939 		pmon(shkp);
940 		if(ib) {
941 			freeobj(ib);
942 			mpickobj(shkp, ib);
943 		}
944 		return(1);
945 	}
946 	return(0);
947 }
948 
949 /* He is digging in the shop. */
950 shopdig(fall)
951 int fall;
952 {
953     if(!fall) {
954 	if(u.utraptype == TT_PIT)
955 	    pline("\"Be careful, sir, or you might fall through the floor.\"");
956 	else
957 	    pline("\"Please, do not damage the floor here.\"");
958     } else if(dist(shopkeeper->mx, shopkeeper->my) < 3) {
959 	struct obj *obj, *obj2;
960 
961 	pline("%s grabs your backpack!", shkname(shopkeeper));
962 	for(obj = invent; obj; obj = obj2) {
963 		obj2 = obj->nobj;
964 		if(obj->owornmask) continue;
965 		freeinv(obj);
966 		obj->nobj = shopkeeper->minvent;
967 		shopkeeper->minvent = obj;
968 		if(obj->unpaid)
969 			subfrombill(obj);
970 	}
971     }
972 }
973 #endif /* QUEST */
974 
975 online(x,y) {
976 	return(x==u.ux || y==u.uy ||
977 		(x-u.ux)*(x-u.ux) == (y-u.uy)*(y-u.uy));
978 }
979 
980 /* Does this monster follow me downstairs? */
981 follower(mtmp)
982 struct monst *mtmp;
983 {
984 	return( mtmp->mtame || index("1TVWZi&, ", mtmp->data->mlet)
985 #ifndef QUEST
986 		|| (mtmp->isshk && ESHK(mtmp)->following)
987 #endif /* QUEST */
988 		);
989 }
990