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typedef struct File	File;
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typedef struct Node	Node;
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typedef struct OS	OS;
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#pragma incomplete File
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enum
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{
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	Maxpath=	512,
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};
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/* a tree for file path's - this mirrors the directory structure */
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struct Node
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{
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	String	*remname;
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	Dir	*d;
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	Node	*parent;
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	Node	*sibs;
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	Node	*children;
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	File	*fp;
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	short	depth;
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	char	chdirunknown;	/* true if QTDIR bit of files in this dir is unknown */
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	int	opens;
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};
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/* OS types */
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enum
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{
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	Unix=		1,
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	Tops=		2,
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	Plan9=		3,
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	VM=		4,
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	VMS=		5,
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	MVS=		6,
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	NetWare=	7,
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	OS½=		8,
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	TSO=		9,
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	NT=		10,
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	Unknown=	11,
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};
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struct OS
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{
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	int	os;
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	char	*name;
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};
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extern OS oslist[];
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/* temporary files */
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void	filefree(Node*);
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int	fileread(Node*, char*, long, int);
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int	filewrite(Node*, char*, long, int);
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void	filedirty(Node*);
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void	fileclean(Node*);
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int	fileisdirty(Node*);
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/* ftp protocol */
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void	hello(char*);
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void	quit(void);
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void	preamble(char*);
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void	rlogin(char *, char *);
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void	clogin(char *, char *);
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void	nop(void);
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int	readdir(Node*);
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int	createdir(Node*);
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int	readfile(Node*);
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int	createfile(Node*);
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int	changedir(Node*);
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int	removefile(Node*);
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int	removedir(Node*);
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/* misc */
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void*	safecpy(void*, void*, int);
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void	fatal(char*, ...);
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int	seterr(char*, ...);
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Node*	extendpath(Node*, String*);
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Node*	newnode(Node*, String*);
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void	uncache(Node*);
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void	invalidate(Node*);
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void	uncachedir(Node*, Node*);
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Node*	newtopsdir(char*);
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void	fixsymbolic(Node*);
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Dir*	reallocdir(Dir *d, int dofree);
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Dir*	dir_change_name(Dir *d, char *name);
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Dir*	dir_change_uid(Dir *d, char *name);
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Dir*	dir_change_gid(Dir *d, char *name);
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Dir*	dir_change_muid(Dir *d, char *name);
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extern Node *remdir;	/* current directory on remote side */
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extern Node *remroot;	/* root on remote side */
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extern int os;		/* remote os */
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extern int debug;	/* non-zero triggers debugging output */
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extern int usenlst;
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extern char *nosuchfile;
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extern char *ext;	/* add to names of non-dir files */
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extern int defos;
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extern int quiet;
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extern char *user;
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#define ISCACHED(x) ((x)->d->type)
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#define UNCACHED(x) (x)->d->type = 0
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#define CACHED(x) { (x)->d->type = 1; (x)->d->atime = time(0); }
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#define ISOLD(x) (x)->d->atime + TIMEOUT < time(0)
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#define ISVALID(x) ((x)->d->dev)
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#define INVALID(x) (x)->d->dev = 0
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#define VALID(x) (x)->d->dev = 1
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#define TIMEOUT 5*60
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#define DMSYML 0x10000000
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#define MAXFDATA 8192
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extern char	net[];		/* network for connections */