/* Definitions for telnet */

struct ucb {
	int	u_state;	/* ESTAB or CLOSING */
	int	u_rstate;	/* Read terminal state */
				/* NORMAL */
				/* BLOCK - don't read terminal */
	int	u_rspecial;	/* Read terminal character handling */
				/* NORMAL */
				/* SPECIAL - processing char after prompt */
	int	u_wstate;	/* Write terminal state */
				/* NORMAL */
				/* URGENTM - urgent mode
				   ignore nonspecial chars */
	int	u_wspecial;	/* Write terminal character handling */
				/* NORMAL */
				/* '\r' (13), IAC, WILL, WONT, DO, DONT -
				   processing special chars */
	FILE	*u_bwrite;	/* Fds for buffered write to terminal */
	int	u_prompt;	/* Prompt char */
	int	u_sendm;	/* Send mode */
				/* EVERYC - send to net on every char */
				/* NEWLINE - send to net on newline */
	int	u_echom;	/* Echo mode */
				/* LOCAL - local echo */
				/* REMOTE - remote echo */
	int	u_echongo;	/* Echo negotiation request outstanding */
				/* NORMAL */
				/* LECHOREQ - IAC DONT ECHO was sent */
				/* RECHOREQ - IAC DO ECHO was sent */
	struct sgttyb	u_tty;	/* Current tty mode */
	struct sgttyb	u_otty;	/* Original tty mode */
	};

#define NORMAL		0
#define SPECIAL		1
#define	BLOCK		1
#define NOBLOCK		2
#define URGENTM		1
#define EVERYC		1
#define NEWLINE		2
#define LOCAL		1
#define REMOTE		2
#define LECHOREQ	1
#define RECHOREQ	2

#define IAC	255
#define WILL	251
#define WONT	252
#define DO	253
#define DONT	254
#define DM	242
#define IP	244
#define AO	245
#define AYT	246
#define OPTECHO	1
#define	OPTSPGA	3

#define	DFESC	'\036'		/* default escape char */

#define ESTAB	1
#define CLOSING	2
#define CLOSED	3

#define TELNET_ICP	23	/* Telnet well known socket no. */

extern struct ucb	ucb;
extern task		*TNsend;	/* Telnet send task */