typedef struct EquipData EquipData;typedef struct ItemData ItemData;typedef struct Item Item;typedef struct ItemList ItemList;typedef struct Tileset Tileset;typedef struct Tile Tile;typedef struct Portal Portal;typedef struct Spawn Spawn;typedef struct Level Level;typedef struct MonsterData MonsterData;typedef struct Monster Monster; /* sizes */enum{	/* name of a monster, item, itemlist */	SZNAME = 64,}; /* directions. ordering matters to drunk1() */enum{	WEST	= 0,	SOUTH,	EAST,	NORTH,	NCARDINAL,	NODIR,}; /* hack9.c */extern int debug;extern int farmsg;extern Monster *player;extern char *user;extern char *home;extern long turn;int isyou(Monster *m);int nearyou(Point p); typedef struct WalkToData WalkToData;struct WalkToData {	int next;	int npath;	Point *path;}; /* ai.c */void aiinit(void);void aiidle(Monster *m); enum{	/* possible item types */	IWEAPON	= 0,	IHELMET,	ICLOAK,	ISHIELD,	IARMOR,	IGLOVES,	IBOOTS,	ICONSUME, 	NEQUIP = IBOOTS+1, 	/* item flags */	IFSTACKS = 0x1,}; struct ItemData{	/* item name */	char name[SZNAME];	/* type */	int type;	/* tile of this item */	int tile; 	/* $ value */	int cost;	/* weight */	int weight; 	union {		/* if weapon, these are set */		struct {			int rolls;			int atk;		}; 		/* if armor, this is set */		int ac; 		/* consumable heals */		int heal;	}; 	/* various flags */	int flags;}; enum{	IMAXAGE	= 500,}; struct Item{	Ref ref; 	/* age, for automatic deletion */	int age; 	/* count of items in stack */	int count; 	/* has a unique name */	char *name; 	/* base data */	ItemData *id; 	/* in a list */	Item *next;}; struct ItemList{	int count;	Item *head, *tail;}; /* item.c */#pragma varargck type "i" Item*char *itypetoname(int type);int itemdbopen(char *file);ItemData *idbyname(char *item);Item *ibyname(char *item);void ifree(Item *i);void ilfree(ItemList *il);Item *iltakenth(ItemList *il, int n);Item *ilnth(ItemList *il, int n);void iladd(ItemList *il, Item *i); struct Tileset{	/* of each tile */	int width;	int height;	Point sz; 	/* from whence we came */	char *name; 	/* actual graphics */	Image *image;}; /* tile.c */Tileset *opentile(char *name, int width, int height);void freetile(Tileset *t); /* draw i'th tile onto dst */void drawtile(Tileset *t, Image *dst, Point p, int i); /* describes what a monster can be equipped with. */struct EquipData{	/* of item/itemlist */	char name[SZNAME];	/* chance of being created */	double prob;}; struct MonsterData{	char name[SZNAME];	/* offset into tileset */	int tile; 	/* base experience level */	int basexpl;	char align;	int mvr;	int maxhp;	int def;	int rolls;	int atk; 	EquipData equip[10];	int nequip;}; /* possible moves */enum{	MNONE,	MMOVE,	/* also attack */	MUSE,	MPICKUP,	MSPECIAL,}; /* monster flags */enum{	Mdead	= 0x1,}; struct Monster{	/* references */	Ref ref; 	/* current level */	Level *l;	/* location */	Point pt; 	/* alignment */	char align; 	/* move rate */	int mvr;	/* move points */	int mvp;	/* turn counter */	int turns; 	/* current hp */	double hp;	/* maximum hp */	double maxhp; 	/* armor class */	int ac; 	/* kill count */	int kills; 	/* experience level */	int xpl;	/* experience gained */	int xp; 	/* flags */	u32int flags; 	/* ai state */	Behavior *bt;	BehaviorState *bs;	Map *bb; 	/* inventory */	ItemList inv; 	/* equipped weapon & armor */	Item *armor[NEQUIP]; 	/* no free */	MonsterData *md;}; /* monst.c */int monstdbopen(char *file);MonsterData *mdbyname(char *monster);Monster *mbyname(char *monster);void mfree(Monster *m);int mupdate(Monster *m);int maction(Monster *m, int what, Point where);int mwield(Monster *m, int n);int munwield(Monster *m, int type);int muse(Monster *m, Item *i);void maddinv(Monster *m, Item *i);void mgenequip(Monster *m);Monster *mcreate(Level *l, Point p, char *type);int xpcalc(int level); /* well known tiles, indexes into tileset */enum{	/* features */	TVWALL		= 830,	THWALL		= 831,	TTLCORNER	= 832,	TTRCORNER	= 833,	TBLCORNER	= 834,	TBRCORNER	= 835,	TSQUARE		= 841,	TTREE		= 847,	TFLOOR		= 848,	TUPSTAIR	= 851,	TDOWNSTAIR	= 852,	TGRAVE		= 856,	TFOUNTAIN	= 859,	TWATER		= 860,	TICE		= 861,	TLAVA		= 862,	TSPAWN		= 888,	TPORTAL		= 891,}; struct Portal{	/* where it takes us to */	Level *to;	/* location in to */	Point pt;}; struct Spawn{	/* where spawn occurs */	Point pt;	/* what to spawn */	char what[SZNAME];	/* frequency of spawn, modulo turns */	int freq;	/* turn counter */	int turn;	/* spawn baddies when enemy is around? */	int istrap;}; struct Tile{	/* current monster occupying tile */	Monster *monst; 	/* has a portal */	Portal *portal; 	/* items here */	ItemList items; 	/*	Feature *feat;	Engraving *engrav;	*/ 	/* the unit on the tile */	int unit; 	/* feature if present */	int feat; 	/* index into tileset */	int terrain;}; enum{	/* tile flags */	Fblocked	= 0x1,	Fhasmonster	= 0x2,	Fhasfeature	= 0x4,	Fhasobject	= 0x8,	Fhasitem	= 0x10,	Fportal		= 0x20,}; struct Level{	char name[SZNAME];	int width;	int height;	Tile *tiles;	u16int *flags; 	/* inset by 1 */	Rectangle r;	/* original rectangle */	Rectangle or;	Point up;	Point down; 	Behavior *bt;	BehaviorState *bs; 	int		nspawns;	Spawn	spawns[10]; 	/* exits on each side */	Point	exits[NCARDINAL];}; /* level.c */void linit(void);Level *lnew(int width, int height, int floor, char *name);void lfree(Level *l);void lmkmons(Level *l, Point *p, int count, char *type, int r);Tile *tileat(Level *l, Point p);#define flagat(l, p) (*(l->flags+(p.y*l->width)+p.x))#define hasflagat(l, p, F) (*(l->flags+(p.y*l->width)+p.x) & (F))#define setflagat(l, p, F) (*(l->flags+(p.y*l->width)+p.x) |= (F))#define clrflagat(l, p, F) (*(l->flags+(p.y*l->width)+p.x) &= ~(F)) /* levelgen.c */Level *lgenerate(int width, int height, int type);int mkldebug(Level *l);int mklforest(Level *l);int mklgraveyard(Level *l);int mklvolcano(Level *l);int mklcastle(Level *l); enum {	/* cost to move N S E W */	ORTHOCOST	= 10,}; /* path.c */int manhattan(Point cur, Point targ);int pathfind(Level *l, Point start, Point end, Point **path, int not); /* ui.c */void msg(char *fmt, ...);void good(char *fmt, ...);void warn(char *fmt, ...);void bad(char *fmt, ...);void dbg(char *fmt, ...);void uiinit(char *name);void uirun(void);int uibt(void *ctx, void *a);void uiredraw(int justui); /* util.c */extern Point cardinals[];Point pickpoint(Rectangle r, int dir, int inset);int roll(int count, int sides);int parseroll(char *str, int *count, int *sides);int min(int a, int b);int max(int a, int b);void *emalloc(ulong);