#

struct scb {
/* NOTE  Fields s_state, s_rstate, s_sstate locations
in structure and value conventions must not change;
they are used by the tcp/application buffering routines 
which are common across different applications */
	int	s_state;	/* Connection state bits */
	int	s_rstate;	/* Rcv from net state */
				/* NORMAL */
				/* URGENTM - urgent mode */
				/*  ignore nonspecial chars */
	int	s_sstate;	/* Send to net state */
				/* NORMAL */
				/* BLOCK - don't read pty -
					local buffers full */

/* Per application variables - these may change for different
applications */
	int	s_rspecial;	/* Rcv from net char handling */
				/* NORMAL */
				/* '\r' (13), IAC, WILL, WONT,
					DO, DONT - processing
					special chars */
	int	s_sspecial;	/* Send to net char handling */
				/* NORMAL */
				/* '\r' (13) */
	long	s_rtime;	/* Time last received data */
	int	s_tmngo;	/* Timing mark negot. status - used
				  to see if foreign applic. is alive */
				/* NORMAL - no req. outstanding */
				/* DO - IAC DO TM  sent */
	int	s_echom;	/* Echo mode */
				/* WILL - server end does echoing wh.
					means that echoing will be left 
					to local pgm control */
				/* WONT - force server end not to echo */
	int	s_echongo;	/* Echo negotiation request outstanding */
				/* NORMAL - no req. outstanding */
				/* WILL - IAC WILL ECHO sent */
				/* WONT - IAC WONT ECHO sent */
	int	s_sga;		/* Server suppress go ahead state */
				/* WILL - will sga */
				/* WONT - wont sga */
	int	s_sgango;	/* Server suppress go ahead
					request outstanding */
				/* NORMAL */
				/* WILL - IAC WILL SGA sent */
				/* WONT - IAC WONT SGA sent */
	int	s_usga;		/* User end suppress go ahead state */
				/* WILL - will sga */
				/* WONT - wont sga */
	int	s_usgango;	/* Request to user end re sga
					outstanding */
				/* NORMAL - no outstanding req */
				/* DO - IAC DO SGA sent */
				/* DONT - IAC DONT SGA sent */
	};

#define TELNETICP	23	/* Telnet tcp well known socket no. */

#define NORMAL	0
#define URGENTM	1
#define BLOCK	1

#define	IAC	255
#define WILL	251
#define WONT	252
#define DO	253
#define DONT	254
#define DM	242
#define BRK	243
#define IP	244
#define AO	245
#define AYT	246
#define EC	247
#define ECHO	1
#define SGA	3
#define	TM	6
#define NUL	0

/* Telnet timeout time */
#define TELTIMEOUT	1800	/* 30 minutes */

/* Telnet connection state bits */
#define OPENING	0
#define DRCV	01
#define DSND	02
#define UCLOSED	04

/* Location in tty struct of special chars - for ttymod
to find values for special chars */
#define CERASE	2
#define CINTR	15
#define CSILENT	30

/* Pty flag2 bits of interest */
#define FORCECHOM	04000	/* Force echo mode ala FECHO bit */
#define FECHO		010000

extern struct scb	scb;
extern int		pty;
extern FILE		*ptyr, *ptyw;
extern int		nptyerr;
#define NPTYERR		20