games/hack/hack.shk.c

/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.shk.c - version 1.0.3 */
/* $FreeBSD: src/games/hack/hack.shk.c,v 1.5 1999/11/16 10:26:37 marcel Exp $ */

#include "hack.h"
#ifdef QUEST
int shlevel = 0;
struct monst *shopkeeper = NULL;
struct obj *billobjs = NULL;

void
obfree(struct obj *obj, struct obj *merge)
{
	free(obj);
}

int
inshop(void)
{
	return (0);
}

void
shopdig(void)
{
}

void
addtobill(void)
{
}

void
subfrombill(void)
{
}

void
splitbill(void)
{
}

int
dopay(void)
{
	return (0);
}

void
paybill(void)
{
}

int
doinvbill(void)
{
	return (0);
}

void
shkdead(void)
{
}

int
shkcatch(void)
{
	return (0);
}

int
shk_move(void)
{
	return (0);
}

void
replshk(struct monst *mtmp, struct monst *mtmp2)
{
}

const char *
shkname(void)
{
	return ("");
}

#else /* QUEST */
#include "hack.mfndpos.h"
#include "def.eshk.h"

#define	ESHK(mon)	((struct eshk *)(&(mon->mextra[0])))
#define	NOTANGRY(mon)	mon->mpeaceful
#define	ANGRY(mon)	!NOTANGRY(mon)

/* Descriptor of current shopkeeper. Note that the bill need not be
 * per-shopkeeper, since it is valid only when in a shop. */
static struct monst *shopkeeper = NULL;
static struct bill_x *bill;
static int shlevel = 0;		/* level of this shopkeeper */
struct obj *billobjs;		/* objects on bill with bp->useup */
				/* only accessed here and by save & restore */
static long int total;		/* filled by addupbill() */
static long int followmsg;	/* last time of follow message */

/*
 *      invariants: obj->unpaid iff onbill(obj) [unless bp->useup]
 *              obj->quan <= bp->bquan
 */

char shtypes[] = {      /* 8 shoptypes: 7 specialized, 1 mixed */
	RING_SYM, WAND_SYM, WEAPON_SYM, FOOD_SYM, SCROLL_SYM,
	POTION_SYM, ARMOR_SYM, 0
};

static const char *shopnam[] = {
	"engagement ring", "walking cane", "antique weapon",
	"delicatessen", "second hand book", "liquor",
	"used armor", "assorted antiques"
};

static void              setpaid(void);
static void              addupbill(void);
static void              findshk(int);
static struct bill_x    *onbill(struct obj *);
static void              pay(long, struct monst *);
static int               dopayobj(struct bill_x *);
static struct obj       *bp_to_obj(struct bill_x *);
static int               getprice(struct obj *);
static int               realhunger(void);

char *
shkname(struct monst *mtmp)             /* called in do_name.c */
{
	return (ESHK(mtmp)->shknam);
}

void
shkdead(struct monst *mtmp)		/* called in mon.c */
{
	struct eshk *eshk = ESHK(mtmp);

	if (eshk->shoplevel == dlevel)
		rooms[eshk->shoproom].rtype = 0;
	if (mtmp == shopkeeper) {
		setpaid();
		shopkeeper = NULL;
		bill = (struct bill_x *) - 1000; /* dump core when referenced */
	}
}

void
replshk(struct monst *mtmp, struct monst *mtmp2)
{
	if (mtmp == shopkeeper) {
		shopkeeper = mtmp2;
		bill = &(ESHK(shopkeeper)->bill[0]);
	}
}

static void
setpaid(void)	/* caller has checked that shopkeeper exists */
		/* either we paid or left the shop or he just died */
{
	struct obj *obj;
	struct monst *mtmp;

	for (obj = invent; obj; obj = obj->nobj)
		obj->unpaid = 0;
	for (obj = fobj; obj; obj = obj->nobj)
		obj->unpaid = 0;
	for (obj = fcobj; obj; obj = obj->nobj)
		obj->unpaid = 0;
	for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
		for (obj = mtmp->minvent; obj; obj = obj->nobj)
			obj->unpaid = 0;
	for (mtmp = fallen_down; mtmp; mtmp = mtmp->nmon)
		for (obj = mtmp->minvent; obj; obj = obj->nobj)
			obj->unpaid = 0;
	while ((obj = billobjs) != NULL) {
		billobjs = obj->nobj;
		free(obj);
	}
	ESHK(shopkeeper)->billct = 0;
}

static void
addupbill(void)		/* delivers result in total */
			/* caller has checked that shopkeeper exists */
{
	int ct = ESHK(shopkeeper)->billct;
	struct bill_x *bp = bill;

	total = 0;
	while (ct--) {
		total += bp->price * bp->bquan;
		bp++;
	}
}

int
inshop(void)
{
	int roomno = inroom(u.ux, u.uy);

	/* Did we just leave a shop? */
	if (u.uinshop &&
	    (u.uinshop != roomno + 1 || shlevel != dlevel || !shopkeeper)) {
		if (shopkeeper) {
			if (ESHK(shopkeeper)->billct) {
				if (inroom(shopkeeper->mx, shopkeeper->my)
				    == u.uinshop - 1)	/* ab@unido */
					pline("Somehow you escaped the shop without paying!");
				addupbill();
				pline("You stole for a total worth of %ld zorkmids.",
				    total);
				ESHK(shopkeeper)->robbed += total;
				setpaid();
				if ((rooms[ESHK(shopkeeper)->shoproom].rtype == GENERAL)
				    == (rn2(3) == 0))
					ESHK(shopkeeper)->following = 1;
			}
			shopkeeper = NULL;
			shlevel = 0;
		}
		u.uinshop = 0;
	}

	/* Did we just enter a zoo of some kind? */
	if (roomno >= 0) {
		int rt = rooms[roomno].rtype;
		struct monst *mtmp;
		if (rt == ZOO)
			pline("Welcome to David's treasure zoo!");
		else if (rt == SWAMP)
			pline("It looks rather muddy down here.");
		else if (rt == MORGUE) {
			if (midnight())
				pline("Go away! Go away!");
			else
				pline("You get an uncanny feeling ...");
		} else
			rt = 0;
		if (rt != 0) {
			rooms[roomno].rtype = 0;
			for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
				if (rt != ZOO || !rn2(3))
					mtmp->msleep = 0;
		}
	}

	/* Did we just enter a shop? */
	if (roomno >= 0 && rooms[roomno].rtype >= 8) {
		if (shlevel != dlevel || !shopkeeper
		    || ESHK(shopkeeper)->shoproom != roomno)
			findshk(roomno);
		if (!shopkeeper) {
			rooms[roomno].rtype = 0;
			u.uinshop = 0;
		} else if (!u.uinshop) {
			if (!ESHK(shopkeeper)->visitct ||
			    strncmp(ESHK(shopkeeper)->customer, plname, PL_NSIZ)) {
				/* He seems to be new here */
				ESHK(shopkeeper)->visitct = 0;
				ESHK(shopkeeper)->following = 0;
				strncpy(ESHK(shopkeeper)->customer, plname, PL_NSIZ);
				NOTANGRY(shopkeeper) = 1;
			}
			if (!ESHK(shopkeeper)->following) {
				boolean box, pick;

				pline("Hello %s! Welcome%s to %s's %s shop!",
				      plname,
				      ESHK(shopkeeper)->visitct++ ? " again" : "",
				      shkname(shopkeeper),
				      shopnam[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]);
				box = carrying(ICE_BOX);
				pick = carrying(PICK_AXE);
				if (box || pick) {
					if (dochug(shopkeeper)) {
						u.uinshop = 0;	/* he died moving */
						return (0);
					}
					pline("Will you please leave your %s outside?",
					    (box && pick) ? "box and pick-axe" :
					    box ? "box" : "pick-axe");
				}
			}
			u.uinshop = roomno + 1;
		}
	}
	return (u.uinshop);
}

static void
findshk(int roomno)
{
	struct monst *mtmp;

	for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
		if (mtmp->isshk && ESHK(mtmp)->shoproom == roomno
		    && ESHK(mtmp)->shoplevel == dlevel) {
			shopkeeper = mtmp;
			bill = &(ESHK(shopkeeper)->bill[0]);
			shlevel = dlevel;
			if (ANGRY(shopkeeper) &&
			    strncmp(ESHK(shopkeeper)->customer, plname, PL_NSIZ))
				NOTANGRY(shopkeeper) = 1;
			/* billobjs = 0; -- this is wrong if we save in a shop */
			/* (and it is harmless to have too many things in billobjs) */
			return;
		}
	shopkeeper = NULL;
	shlevel = 0;
	bill = (struct bill_x *) - 1000;	/* dump core when referenced */
}

static struct bill_x *
onbill(struct obj *obj)
{
	struct bill_x *bp;

	if (!shopkeeper)
		return (0);
	for (bp = bill; bp < &bill[ESHK(shopkeeper)->billct]; bp++)
		if (bp->bo_id == obj->o_id) {
			if (!obj->unpaid)
				pline("onbill: paid obj on bill?");
			return (bp);
		}
	if (obj->unpaid)
		pline("onbill: unpaid obj not on bill?");
	return (0);
}

/* called with two args on merge */
void
obfree(struct obj *obj, struct obj *merge)
{
	struct bill_x *bp = onbill(obj);
	struct bill_x *bpm;

	if (bp) {
		if (!merge) {
			bp->useup = 1;
			obj->unpaid = 0;	/* only for doinvbill */
			obj->nobj = billobjs;
			billobjs = obj;
			return;
		}
		bpm = onbill(merge);
		if (!bpm) {
			/* this used to be a rename */
			impossible("obfree: not on bill??");
			return;
		} else {
			/* this was a merger */
			bpm->bquan += bp->bquan;
			ESHK(shopkeeper)->billct--;
			*bp = bill[ESHK(shopkeeper)->billct];
		}
	}
	free(obj);
}

static void
pay(long tmp, struct monst *shkp)
{
	long robbed = ESHK(shkp)->robbed;

	u.ugold -= tmp;
	shkp->mgold += tmp;
	flags.botl = 1;
	if (robbed) {
		robbed -= tmp;
		if (robbed < 0)
			robbed = 0;
		ESHK(shkp)->robbed = robbed;
	}
}

int
dopay(void)
{
	long ltmp;
	struct bill_x *bp;
	struct monst *shkp;
	int pass, tmp;

	multi = 0;
	inshop();
	for (shkp = fmon; shkp; shkp = shkp->nmon)
		if (shkp->isshk && dist(shkp->mx, shkp->my) < 3)
			break;
	if (!shkp && u.uinshop &&
	    inroom(shopkeeper->mx, shopkeeper->my) == ESHK(shopkeeper)->shoproom)
		shkp = shopkeeper;

	if (!shkp) {
		pline("There is nobody here to receive your payment.");
		return (0);
	}
	ltmp = ESHK(shkp)->robbed;
	if (shkp != shopkeeper && NOTANGRY(shkp)) {
		if (!ltmp)
			pline("You do not owe %s anything.", monnam(shkp));
		else if (!u.ugold)
			pline("You have no money.");
		else {
			long ugold = u.ugold;

			if (u.ugold > ltmp) {
				pline("You give %s the %ld gold pieces he asked for.",
				    monnam(shkp), ltmp);
				pay(ltmp, shkp);
			} else {
				pline("You give %s all your gold.", monnam(shkp));
				pay(u.ugold, shkp);
			}
			if (ugold < ltmp / 2)
				pline("Unfortunately, he doesn't look satisfied.");
			else {
				ESHK(shkp)->robbed = 0;
				ESHK(shkp)->following = 0;
				if (ESHK(shkp)->shoplevel != dlevel) {
					/* For convenience's sake, let him disappear */
					shkp->minvent = 0;	/* %% */
					shkp->mgold = 0;
					mondead(shkp);
				}
			}
		}
		return (1);
	}

	if (!ESHK(shkp)->billct) {
		pline("You do not owe %s anything.", monnam(shkp));
		if (!u.ugold) {
			pline("Moreover, you have no money.");
			return (1);
		}
		if (ESHK(shkp)->robbed) {
#define	min(a, b)	((a < b) ? a : b)
			pline("But since his shop has been robbed recently,");
			pline("you %srepay %s's expenses.",
			    (u.ugold < ESHK(shkp)->robbed) ? "partially " : "",
			    monnam(shkp));
			pay(min(u.ugold, ESHK(shkp)->robbed), shkp);
			ESHK(shkp)->robbed = 0;
			return (1);
		}
		if (ANGRY(shkp)) {
			pline("But in order to appease %s,",
			      amonnam(shkp, "angry"));
			if (u.ugold >= 1000) {
				ltmp = 1000;
				pline(" you give him 1000 gold pieces.");
			} else {
				ltmp = u.ugold;
				pline(" you give him all your money.");
			}
			pay(ltmp, shkp);
			if (strncmp(ESHK(shkp)->customer, plname, PL_NSIZ)
			    || rn2(3)) {
				pline("%s calms down.", Monnam(shkp));
				NOTANGRY(shkp) = 1;
			} else
				pline("%s is as angry as ever.", Monnam(shkp));
		}
		return (1);
	}
	if (shkp != shopkeeper) {
		impossible("dopay: not to shopkeeper?");
		if (shopkeeper)
			setpaid();
		return (0);
	}
	for (pass = 0; pass <= 1; pass++) {
		tmp = 0;
		while (tmp < ESHK(shopkeeper)->billct) {
			bp = &bill[tmp];
			if (!pass && !bp->useup) {
				tmp++;
				continue;
			}
			if (!dopayobj(bp))
				return (1);
			bill[tmp] = bill[--ESHK(shopkeeper)->billct];
		}
	}
	pline("Thank you for shopping in %s's %s store!",
	      shkname(shopkeeper),
	      shopnam[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]);
	NOTANGRY(shopkeeper) = 1;
	return (1);
}

/* return 1 if paid successfully */
/*        0 if not enough money */
/*       -1 if object could not be found (but was paid) */
static int
dopayobj(struct bill_x *bp)
{
	struct obj *obj;
	long ltmp;

	/* find the object on one of the lists */
	obj = bp_to_obj(bp);

	if (!obj) {
		impossible("Shopkeeper administration out of order.");
		setpaid();	/* be nice to the player */
		return (0);
	}

	if (!obj->unpaid && !bp->useup) {
		impossible("Paid object on bill??");
		return (1);
	}
	obj->unpaid = 0;
	ltmp = bp->price * bp->bquan;
	if (ANGRY(shopkeeper))
		ltmp += ltmp / 3;
	if (u.ugold < ltmp) {
		pline("You don't have gold enough to pay %s.",
		      doname(obj));
		obj->unpaid = 1;
		return (0);
	}
	pay(ltmp, shopkeeper);
	pline("You bought %s for %ld gold piece%s.",
	      doname(obj), ltmp, plur(ltmp));
	if (bp->useup) {
		struct obj *otmp = billobjs;
		if (obj == billobjs)
			billobjs = obj->nobj;
		else {
			while (otmp && otmp->nobj != obj)
				otmp = otmp->nobj;
			if (otmp)
				otmp->nobj = obj->nobj;
			else
				pline("Error in shopkeeper administration.");
		}
		free(obj);
	}
	return (1);
}

/* routine called after dying (or quitting) with nonempty bill */
void
paybill(void)
{
	if (shlevel == dlevel && shopkeeper && ESHK(shopkeeper)->billct) {
		addupbill();
		if (total > u.ugold) {
			shopkeeper->mgold += u.ugold;
			u.ugold = 0;
			pline("%s comes and takes all your possessions.",
			      Monnam(shopkeeper));
		} else {
			u.ugold -= total;
			shopkeeper->mgold += total;
			pline("%s comes and takes the %ld zorkmids you owed him.",
			    Monnam(shopkeeper), total);
		}
		setpaid();	/* in case we create bones */
	}
}

/* find obj on one of the lists */
static struct obj *
bp_to_obj(struct bill_x *bp)
{
	struct obj *obj;
	struct monst *mtmp;
	unsigned id = bp->bo_id;

	if (bp->useup)
		obj = o_on(id, billobjs);
	else if (!(obj = o_on(id, invent)) &&
		 !(obj = o_on(id, fobj)) &&
		 !(obj = o_on(id, fcobj))) {
		for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
			if ((obj = o_on(id, mtmp->minvent)) != NULL)
				break;
		for (mtmp = fallen_down; mtmp; mtmp = mtmp->nmon)
			if ((obj = o_on(id, mtmp->minvent)) != NULL)
				break;
	}
	return (obj);
}

/* called in hack.c when we pickup an object */
void
addtobill(struct obj *obj)
{
	struct bill_x *bp;

	if (!inshop() ||
	    (u.ux == ESHK(shopkeeper)->shk.x && u.uy == ESHK(shopkeeper)->shk.y) ||
	    (u.ux == ESHK(shopkeeper)->shd.x && u.uy == ESHK(shopkeeper)->shd.y) ||
	    onbill(obj)	/* perhaps we threw it away earlier */
	   )
		return;
	if (ESHK(shopkeeper)->billct == BILLSZ) {
		pline("You got that for free!");
		return;
	}
	bp = &bill[ESHK(shopkeeper)->billct];
	bp->bo_id = obj->o_id;
	bp->bquan = obj->quan;
	bp->useup = 0;
	bp->price = getprice(obj);
	ESHK(shopkeeper)->billct++;
	obj->unpaid = 1;
}

void
splitbill(struct obj *obj, struct obj *otmp)
{
	/* otmp has been split off from obj */
	struct bill_x *bp;
	int tmp;

	bp = onbill(obj);
	if (!bp) {
		impossible("splitbill: not on bill?");
		return;
	}
	if (bp->bquan < otmp->quan)
		impossible("Negative quantity on bill??");
	if (bp->bquan == otmp->quan)
		impossible("Zero quantity on bill??");
	bp->bquan -= otmp->quan;

	if (ESHK(shopkeeper)->billct == BILLSZ)
		otmp->unpaid = 0;
	else {
		tmp = bp->price;
		bp = &bill[ESHK(shopkeeper)->billct];
		bp->bo_id = otmp->o_id;
		bp->bquan = otmp->quan;
		bp->useup = 0;
		bp->price = tmp;
		ESHK(shopkeeper)->billct++;
	}
}

void
subfrombill(struct obj *obj)
{
	long ltmp;
	int tmp;
	struct obj *otmp;
	struct bill_x *bp;

	if (!inshop() ||
	    (u.ux == ESHK(shopkeeper)->shk.x && u.uy == ESHK(shopkeeper)->shk.y) ||
	    (u.ux == ESHK(shopkeeper)->shd.x && u.uy == ESHK(shopkeeper)->shd.y))
		return;
	if ((bp = onbill(obj)) != NULL) {
		obj->unpaid = 0;
		if (bp->bquan > obj->quan) {
			otmp = newobj(0);
			*otmp = *obj;
			bp->bo_id = otmp->o_id = flags.ident++;
			otmp->quan = (bp->bquan -= obj->quan);
			otmp->owt = 0;	/* superfluous */
			otmp->onamelth = 0;
			bp->useup = 1;
			otmp->nobj = billobjs;
			billobjs = otmp;
			return;
		}
		ESHK(shopkeeper)->billct--;
		*bp = bill[ESHK(shopkeeper)->billct];
		return;
	}
	if (obj->unpaid) {
		pline("%s didn't notice.", Monnam(shopkeeper));
		obj->unpaid = 0;
		return;		/* %% */
	}
	/* he dropped something of his own - probably wants to sell it */
	if (shopkeeper->msleep || shopkeeper->mfroz ||
	    inroom(shopkeeper->mx, shopkeeper->my) != ESHK(shopkeeper)->shoproom)
		return;
	if (ESHK(shopkeeper)->billct == BILLSZ ||
	    ((tmp = shtypes[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]) &&
	     tmp != obj->olet) || strchr("_0", obj->olet)) {
		pline("%s seems not interested.", Monnam(shopkeeper));
		return;
	}
	ltmp = getprice(obj) * obj->quan;
	if (ANGRY(shopkeeper)) {
		ltmp /= 3;
		NOTANGRY(shopkeeper) = 1;
	} else
		ltmp /= 2;
	if (ESHK(shopkeeper)->robbed) {
		if ((ESHK(shopkeeper)->robbed -= ltmp) < 0)
			ESHK(shopkeeper)->robbed = 0;
		pline("Thank you for your contribution to restock this recently plundered shop.");
		return;
	}
	if (ltmp > shopkeeper->mgold)
		ltmp = shopkeeper->mgold;
	pay(-ltmp, shopkeeper);
	if (!ltmp)
		pline("%s gladly accepts %s but cannot pay you at present.",
		      Monnam(shopkeeper), doname(obj));
	else
		pline("You sold %s and got %ld gold piece%s.", doname(obj), ltmp,
		      plur(ltmp));
}

int
doinvbill(int mode)	/* 0: deliver count 1: paged */
{
	struct bill_x *bp;
	struct obj *obj;
	long totused, thisused;
	char buf[BUFSZ];

	if (mode == 0) {
		int cnt = 0;

		if (shopkeeper)
			for (bp = bill; bp - bill < ESHK(shopkeeper)->billct; bp++)
				if (bp->useup ||
				    ((obj = bp_to_obj(bp)) && obj->quan < bp->bquan))
					cnt++;
		return (cnt);
	}

	if (!shopkeeper) {
		impossible("doinvbill: no shopkeeper?");
		return (0);
	}

	set_pager(0);
	if (page_line("Unpaid articles already used up:") || page_line(""))
		goto quit;

	totused = 0;
	for (bp = bill; bp - bill < ESHK(shopkeeper)->billct; bp++) {
		obj = bp_to_obj(bp);
		if (!obj) {
			impossible("Bad shopkeeper administration.");
			goto quit;
		}
		if (bp->useup || bp->bquan > obj->quan) {
			int cnt, oquan, uquan;

			oquan = obj->quan;
			uquan = (bp->useup ? bp->bquan : bp->bquan - oquan);
			thisused = bp->price * uquan;
			totused += thisused;
			obj->quan = uquan;	/* cheat doname */
			sprintf(buf, "x -  %s", doname(obj));
			obj->quan = oquan;	/* restore value */
			for (cnt = 0; buf[cnt]; cnt++)
				; /* nothing */
			while (cnt < 50)
				buf[cnt++] = ' ';
			sprintf(&buf[cnt], " %5ld zorkmids", thisused);
			if (page_line(buf))
				goto quit;
		}
	}
	sprintf(buf, "Total:%50ld zorkmids", totused);
	if (page_line("") || page_line(buf))
		goto quit;
	set_pager(1);
	return (0);
quit:
	set_pager(2);
	return (0);
}

static int
getprice(struct obj *obj)
{
	int tmp, ac;

	switch (obj->olet) {
	case AMULET_SYM:
		tmp = 10 * rnd(500);
		break;
	case TOOL_SYM:
		tmp = 10 * rnd((obj->otyp == EXPENSIVE_CAMERA) ? 150 : 30);
		break;
	case RING_SYM:
		tmp = 10 * rnd(100);
		break;
	case WAND_SYM:
		tmp = 10 * rnd(100);
		break;
	case SCROLL_SYM:
		tmp = 10 * rnd(50);
#ifdef MAIL
		if (obj->otyp == SCR_MAIL)
			tmp = rnd(5);
#endif /* MAIL */
		break;
	case POTION_SYM:
		tmp = 10 * rnd(50);
		break;
	case FOOD_SYM:
		tmp = 10 * rnd(5 + (2000 / realhunger()));
		break;
	case GEM_SYM:
		tmp = 10 * rnd(20);
		break;
	case ARMOR_SYM:
		ac = ARM_BONUS(obj);
		if (ac <= -10)	/* probably impossible */
			ac = -9;
		tmp = 100 + ac * ac * rnd(10 + ac);
		break;
	case WEAPON_SYM:
		if (obj->otyp < BOOMERANG)
			tmp = 5 * rnd(10);
		else if (obj->otyp == LONG_SWORD ||
			 obj->otyp == TWO_HANDED_SWORD)
			tmp = 10 * rnd(150);
		else
			tmp = 10 * rnd(75);
		break;
	case CHAIN_SYM:
		pline("Strange ..., carrying a chain?");
	case BALL_SYM:
		tmp = 10;
		break;
	default:
		tmp = 10000;
	}
	return (tmp);
}

static int
realhunger(void)	/* not completely foolproof */
{
	int tmp = u.uhunger;
	struct obj *otmp = invent;

	while (otmp) {
		if (otmp->olet == FOOD_SYM && !otmp->unpaid)
			tmp += objects[otmp->otyp].nutrition;
		otmp = otmp->nobj;
	}
	return ((tmp <= 0) ? 1 : tmp);
}

bool
shkcatch(struct obj *obj)
{
	struct monst *shkp = shopkeeper;

	if (u.uinshop && shkp && !shkp->mfroz && !shkp->msleep &&
	    u.dx && u.dy &&
	    inroom(u.ux + u.dx, u.uy + u.dy) + 1 == u.uinshop &&
	    shkp->mx == ESHK(shkp)->shk.x && shkp->my == ESHK(shkp)->shk.y &&
	    u.ux == ESHK(shkp)->shd.x && u.uy == ESHK(shkp)->shd.y) {
		pline("%s nimbly catches the %s.", Monnam(shkp), xname(obj));
		obj->nobj = shkp->minvent;
		shkp->minvent = obj;
		return (1);
	}
	return (0);
}

/*
 * shk_move: return 1: he moved  0: he didnt  -1: let m_move do it
 */
int
shk_move(struct monst *shkp)
{
	struct monst *mtmp;
	struct permonst *mdat = shkp->data;
	xchar gx, gy, omx, omy, nx, ny, nix, niy;
	schar appr, i;
	int udist;
	int z;
	schar shkroom, chi, chcnt, cnt;
	boolean uondoor = 0, satdoor, avoid = 0, badinv;
	coord poss[9];
	int info[9];
	struct obj *ib = NULL;

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

	if ((udist = dist(omx, omy)) < 3) {
		if (ANGRY(shkp)) {
			hitu(shkp, d(mdat->damn, mdat->damd) + 1);
			return (0);
		}
		if (ESHK(shkp)->following) {
			if (strncmp(ESHK(shkp)->customer, plname, PL_NSIZ)) {
				pline("Hello %s! I was looking for %s.",
				      plname, ESHK(shkp)->customer);
				ESHK(shkp)->following = 0;
				return (0);
			}
			if (!ESHK(shkp)->robbed) {	/* impossible? */
				ESHK(shkp)->following = 0;
				return (0);
			}
			if (moves > followmsg + 4) {
				pline("Hello %s! Didn't you forget to pay?",
				      plname);
				followmsg = moves;
			}
			if (udist < 2)
				return (0);
		}
	}

	shkroom = inroom(omx, omy);
	appr = 1;
	gx = ESHK(shkp)->shk.x;
	gy = ESHK(shkp)->shk.y;
	satdoor = (gx == omx && gy == omy);
	if (ESHK(shkp)->following || ((z = holetime()) >= 0 && z * z <= udist)) {
		gx = u.ux;
		gy = u.uy;
		if (shkroom < 0 || shkroom != inroom(u.ux, u.uy))
			if (udist > 4)
				return (-1);	/* leave it to m_move */
	} else if (ANGRY(shkp)) {
		long saveBlind = Blind;
		Blind = 0;
		if (shkp->mcansee && !Invis && cansee(omx, omy)) {
			gx = u.ux;
			gy = u.uy;
		}
		Blind = saveBlind;
		avoid = FALSE;
	} else {
#define	GDIST(x, y)	((x - gx) * (x - gx) + (y - gy) * (y - gy))
		if (Invis)
			avoid = FALSE;
		else {
			uondoor = (u.ux == ESHK(shkp)->shd.x &&
				   u.uy == ESHK(shkp)->shd.y);
			if (uondoor) {
				if (ESHK(shkp)->billct)
					pline("Hello %s! Will you please pay before leaving?",
					    plname);
				badinv = (carrying(PICK_AXE) || carrying(ICE_BOX));
				if (satdoor && badinv)
					return (0);
				avoid = !badinv;
			} else {
				avoid = (u.uinshop && dist(gx, gy) > 8);
				badinv = FALSE;
			}

			if (((!ESHK(shkp)->robbed && !ESHK(shkp)->billct) || avoid)
			    && GDIST(omx, omy) < 3) {
				if (!badinv && !online(omx, omy))
					return (0);
				if (satdoor)
					appr = gx = gy = 0;
			}
		}
	}
	if (omx == gx && omy == gy)
		return (0);
	if (shkp->mconf) {
		avoid = FALSE;
		appr = 0;
	}
	nix = omx;
	niy = omy;
	cnt = mfndpos(shkp, poss, info, ALLOW_SSM);
	if (avoid && uondoor) {	/* perhaps we cannot avoid him */
		for (i = 0; i < cnt; i++)
			if (!(info[i] & NOTONL))
				goto notonl_ok;
		avoid = FALSE;
notonl_ok:
		;
	}
	chi = -1;
	chcnt = 0;
	for (i = 0; i < cnt; i++) {
		nx = poss[i].x;
		ny = poss[i].y;
		if (levl[nx][ny].typ == ROOM
		    || shkroom != ESHK(shkp)->shoproom
		    || ESHK(shkp)->following) {
#ifdef STUPID
			/* cater for stupid compilers */
			int zz;
#endif /* STUPID */
			if (uondoor && (ib = sobj_at(ICE_BOX, nx, ny))) {
				nix = nx;
				niy = ny;
				chi = i; break;
			}
			if (avoid && (info[i] & NOTONL))
				continue;
			if ((!appr && !rn2(++chcnt)) ||
#ifdef STUPID
			    (appr && (zz = GDIST(nix, niy)) && zz > GDIST(nx, ny))
#else
			    (appr && GDIST(nx, ny) < GDIST(nix, niy))
#endif /* STUPID */
			    ) {
				nix = nx;
				niy = ny;
				chi = i;
			}
		}
	}
	if (nix != omx || niy != omy) {
		if (info[chi] & ALLOW_M) {
			mtmp = m_at(nix, niy);
			if (hitmm(shkp, mtmp) == 1 && rn2(3) &&
			    hitmm(mtmp, shkp) == 2)
				return (2);
			return (0);
		} else if (info[chi] & ALLOW_U) {
			hitu(shkp, d(mdat->damn, mdat->damd) + 1);
			return (0);
		}
		shkp->mx = nix;
		shkp->my = niy;
		pmon(shkp);
		if (ib) {
			freeobj(ib);
			mpickobj(shkp, ib);
		}
		return (1);
	}
	return (0);
}

/* He is digging in the shop. */
void
shopdig(int fall)
{
	if (!fall) {
		if (u.utraptype == TT_PIT)
			pline("\"Be careful, sir, or you might fall through the floor.\"");
		else
			pline("\"Please, do not damage the floor here.\"");
	} else if (dist(shopkeeper->mx, shopkeeper->my) < 3) {
		struct obj *obj, *obj2;

		pline("%s grabs your backpack!", shkname(shopkeeper));
		for (obj = invent; obj; obj = obj2) {
			obj2 = obj->nobj;
			if (obj->owornmask)
				continue;
			freeinv(obj);
			obj->nobj = shopkeeper->minvent;
			shopkeeper->minvent = obj;
			if (obj->unpaid)
				subfrombill(obj);
		}
	}
}
#endif /* QUEST */

bool
online(int x, int y)
{
	return (x == u.ux || y == u.uy ||
		(x - u.ux) * (x - u.ux) == (y - u.uy) * (y - u.uy));
}

/* Does this monster follow me downstairs? */
bool
follower(struct monst *mtmp)
{
	return (mtmp->mtame || strchr("1TVWZi&, ", mtmp->data->mlet)
#ifndef QUEST
		|| (mtmp->isshk && ESHK(mtmp)->following)
#endif /* QUEST */
		);
}