typedef struct Exec Exec;typedef struct Message Message;typedef struct Window Window; enum{	STACK		= 8192,	EVENTSIZE	= 256,	NEVENT		= 5,}; struct Window{	char*	name;	Panel*	g;	Panel*	gtag;	Panel*	gtext;	Biobuf*	body;	char*	bodyf;}; struct Message{	Window	*w;	int		ctlfd;	char		*name;	char		*replyname;	uchar	opened;	uchar	dirty;	uchar	isreply;	uchar	deleted;	uchar	writebackdel;	uchar	tagposted;	uchar	recursed;	uchar	level;	uchar	saved;	uchar	replied;	/* header info */	char		*fromcolon;	/* from header file; all rest are from info file */	char		*from;	char		*to;	char		*cc;	char		*replyto;	char		*date;	char		*subject;	char		*type;	char		*disposition;	char		*filename;	char		*digest; 	Message	*next;	/* next in this mailbox */	Message	*prev;	/* prev in this mailbox */	Message	*head;	/* first subpart */	Message	*tail;		/* last subpart */}; enum{	NARGS		= 100,	NARGCHAR	= 8*1024,	EXECSTACK 	= STACK+(NARGS+1)*sizeof(char*)+NARGCHAR}; struct Exec{	char		*prog;	char		**argv;	int		p[2];	/* p[1] is write to program; p[0] set to prog fd 0*/	int		q[2];	/* q[0] is read from program; q[1] set to prog fd 1 */	Channel	*sync;}; extern	Window*	newwindow(char* name);extern	void		winopenbody(Window*);extern	void		winclosebody(Window*);extern	void		wintagwrite(Window*, char*, int);extern	int		windel(Window*);extern	void		winwritebody(Window*, char*, int);extern	void		winclean(Window*);extern	char*	winreadbody(Window*, int*);extern	void		readmbox(Message*, char*, char*);extern	void		rewritembox(Window*, Message*); extern	void		mkreply(Message*, char*, char*, char*, Plumbattr*, char*);extern	void		delreply(Message*); extern	int		mesgadd(Message*, char*, Dir*, char*);extern	void		mesgmenu(Window*, Message*);extern	int		mesgopen(Message*, char*, char*, Message*, char*);extern	void		mesgctl(void*);extern	void		mesgsend(Message*);extern	void		mesgdel(Message*, Message*);extern	void		mesgmenudel(Window*, Message*, Message*);extern	void		mesgmenumark(Window*, char*, char*);extern	void		mesgmenumarkdel(Window*, Message*, Message*, int);extern	Message*	mesglookup(Message*, char*, char*);extern	Message*	mesglookupfile(Message*, char*, char*);extern	void		mesgfreeparts(Message*); extern	char*	readfile(char*, char*, int*);extern	char*	readbody(char*, char*, int*);extern	void		ctlprint(int, char*, ...);extern	void*	emalloc(uint);extern	void*	erealloc(void*, uint);extern	char*	estrdup(char*);extern	char*	estrstrdup(char*, char*);extern	char*	egrow(char*, char*, char*);extern	char*	eappend(char*, char*, char*);extern	void		error(char*, ...);extern	int		tokenizec(char*, char**, int, char*);extern	void		execproc(void*); #pragma	varargck	argpos	error	1#pragma	varargck	argpos	ctlprint	2 extern	Window	*wbox;extern	Message	mbox;extern	Message	replies;extern	char		*fsname;extern	int		plumbsendfd;extern	int		plumbseemailfd;extern	char		*home;extern	char		*outgoing;extern	char		*mailboxdir;extern	char		*user;extern	char		deleted[];extern	int		wctlfd;extern	int		shortmenu;extern	int		debug; #define dprint	if(debug)fprint