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#pragma	src	"/sys/src/libc/9sys"
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#pragma	lib	"libc.a"
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#define	VERSION9P	"9P2000"
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#define	MAXWELEM	16
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typedef
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struct	Fcall
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{
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	uchar	type;
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	u32int	fid;
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	ushort	tag;
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	union {
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		struct {
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			u32int	msize;		/* Tversion, Rversion */
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			char	*version;	/* Tversion, Rversion */
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		};
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		struct {
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			ushort	oldtag;		/* Tflush */
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		};
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		struct {
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			char	*ename;		/* Rerror */
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		};
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		struct {
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			Qid	qid;		/* Rattach, Ropen, Rcreate */
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			u32int	iounit;		/* Ropen, Rcreate */
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		};
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		struct {
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			Qid	aqid;		/* Rauth */
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		};
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		struct {
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			u32int	afid;		/* Tauth, Tattach */
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			char	*uname;		/* Tauth, Tattach */
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			char	*aname;		/* Tauth, Tattach */
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		};
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		struct {
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			u32int	perm;		/* Tcreate */
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			char	*name;		/* Tcreate */
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			uchar	mode;		/* Tcreate, Topen */
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		};
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		struct {
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			u32int	newfid;		/* Twalk */
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			ushort	nwname;		/* Twalk */
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			char	*wname[MAXWELEM];	/* Twalk */
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		};
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		struct {
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			ushort	nwqid;		/* Rwalk */
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			Qid	wqid[MAXWELEM];		/* Rwalk */
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		};
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		struct {
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			vlong	offset;		/* Tread, Twrite */
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			u32int	count;		/* Tread, Twrite, Rread */
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			char	*data;		/* Twrite, Rread */
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		};
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		struct {
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			ushort	nstat;		/* Twstat, Rstat */
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			uchar	*stat;		/* Twstat, Rstat */
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		};
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	};
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} Fcall;
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#define	GBIT8(p)	((p)[0])
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#define	GBIT16(p)	((p)[0]|((p)[1]<<8))
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#define	GBIT32(p)	((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24))
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#define	GBIT64(p)	((u32int)((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24)) |\
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				((vlong)((p)[4]|((p)[5]<<8)|((p)[6]<<16)|((p)[7]<<24)) << 32))
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#define	PBIT8(p,v)	(p)[0]=(v)
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#define	PBIT16(p,v)	(p)[0]=(v);(p)[1]=(v)>>8
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#define	PBIT32(p,v)	(p)[0]=(v);(p)[1]=(v)>>8;(p)[2]=(v)>>16;(p)[3]=(v)>>24
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#define	PBIT64(p,v)	(p)[0]=(v);(p)[1]=(v)>>8;(p)[2]=(v)>>16;(p)[3]=(v)>>24;\
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			(p)[4]=(v)>>32;(p)[5]=(v)>>40;(p)[6]=(v)>>48;(p)[7]=(v)>>56
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#define	BIT8SZ		1
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#define	BIT16SZ		2
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#define	BIT32SZ		4
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#define	BIT64SZ		8
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#define	QIDSZ	(BIT8SZ+BIT32SZ+BIT64SZ)
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/* STATFIXLEN includes leading 16-bit count */
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/* The count, however, excludes itself; total size is BIT16SZ+count */
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#define STATFIXLEN	(BIT16SZ+QIDSZ+5*BIT16SZ+4*BIT32SZ+1*BIT64SZ)	/* amount of fixed length data in a stat buffer */
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#define	NOTAG		(ushort)~0U	/* Dummy tag */
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#define	NOFID		(u32int)~0U	/* Dummy fid */
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#define	IOHDRSZ		24	/* ample room for Twrite/Rread header (iounit) */
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enum
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{
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	Tversion =	100,
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	Rversion,
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	Tauth =		102,
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	Rauth,
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	Tattach =	104,
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	Rattach,
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	Terror =	106,	/* illegal */
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	Rerror,
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	Tflush =	108,
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	Rflush,
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	Twalk =		110,
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	Rwalk,
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	Topen =		112,
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	Ropen,
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	Tcreate =	114,
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	Rcreate,
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	Tread =		116,
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	Rread,
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	Twrite =	118,
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	Rwrite,
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	Tclunk =	120,
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	Rclunk,
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	Tremove =	122,
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	Rremove,
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	Tstat =		124,
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	Rstat,
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	Twstat =	126,
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	Rwstat,
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	Tmax,
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};
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uint	convM2S(uchar*, uint, Fcall*);
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uint	convS2M(Fcall*, uchar*, uint);
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uint	sizeS2M(Fcall*);
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int	statcheck(uchar *abuf, uint nbuf);
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uint	convM2D(uchar*, uint, Dir*, char*);
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uint	convD2M(Dir*, uchar*, uint);
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uint	sizeD2M(Dir*);
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int	fcallfmt(Fmt*);
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int	dirfmt(Fmt*);
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int	dirmodefmt(Fmt*);
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int	read9pmsg(int, void*, uint);
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#pragma	varargck	type	"F"	Fcall*
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#pragma	varargck	type	"M"	ulong
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#pragma	varargck	type	"D"	Dir*