/*-
 * Copyright (c) 1985 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.proprietary.c%
 *
 *	@(#)pk.h	5.7 (Berkeley) 04/24/91
 */

struct header {
	char	sync;
	char	ksize;
	unsigned short sum;
	char	cntl;
	char	ccntl;
};

#define	HDRSIZ		6	/* Packet header size */
#define	PACKSIZE	64	/* Standard packet size */
#define WINDOWS		7	/* number of outstanding un-ack'd packets */

struct pack {
	short	p_state;	/* line state */
	short	p_bits;		/* mask for getepack */
	short	p_rsize;	/* input packet size */
	short	p_xsize;	/* output packet size */
	struct	header p_ihbuf;	/* input header */
	struct	header p_ohbuf; /* output header */
	char	*p_rptr;
	char	**p_ipool;
	char	p_xcount;	/* # active output buffers */
	char	p_rcount;
	char	p_lpsize;	/* log(psize/32) */
	char	p_obusy;	/* output busy? for reentrant pkoutput() */
	char	p_srxmit;
	char	p_rwindow;	/* window size */
	char	p_swindow;
	char	p_msg;		/* control msg */
	char	p_rmsg;		/* repeated control msg */
	char	p_ps,p_pr;	/* last packet sent, recv'd */
	char	p_rpr;
	char	p_nxtps;	/* next output seq number */
	char	p_imap;		/* bit map of input buffers */
	char	p_pscopy;	/* newest output packet */
	char	*p_ob[8];	/* output buffers */
	char	*p_ib[8];	/* input buffers */
	char	p_os[8];	/* output buffer status */
	char	p_is[8];	/* input buffer status */
	short	p_osum[8];	/* output checksums */
	short	p_isum[8];	/* input checksums */
	int p_ifn, p_ofn;
};

#define	CHECK	0125252
#define	SYN	020
#define	MOD8	7
#define	ISCNTL(a)	((a & 0300)==0)
/* MIN may have been defined in <sys/param.h> */
#undef	MIN
#define	MIN(a,b)	((a<b)? a:b)

extern char	next[8];
extern char	mask[8];

/*
 * driver state
 */
#define	DEAD	0
#define	INITa	1
#define	INITb	2
#define	INITab	3
#define	LIVE	010
#define	RXMIT	020
#define	RREJ	040
#define PDEBUG	0200
#define	DRAINO	0400
#define	WAITO	01000
#define	DOWN	02000
#define	RCLOSE	04000
#define	BADFRAME 020000

/*
 * io buffer states
 */
#define	B_NULL	0
#define	B_READY	1
#define	B_SENT	2
#define	B_RESID	010
#define	B_COPY	020
#define	B_MARK	040
#define	B_SHORT	0100

/* read or write */

#define B_WRITE	0
#define B_READ	1

/*
 * control messages
 */
#define	CLOSE	1
#define	RJ	2
#define	SRJ	3
#define	RR	4
#define	INITC	5
#define	INITB	6
#define	INITA	7

#define	M_CLOSE	002
#define	M_RJ	004
#define	M_SRJ	010
#define	M_RR	020
#define	M_INITC	040
#define	M_INITA	0200
#define	M_INITB	0100

#define	NPLINES	2

extern int pksizes[];