/* -----------------------------------------------------------------------
 * terminal.c   telnet
 *
 * $Locker:  $
 *
 * $Id: terminal.c,v 1.1 91/01/15 18:00:12 bj Exp $
 *
 * $Revision: 1.1 $
 *
 * $Header: HOG:Other/inetx/src/telnet/RCS/terminal.c,v 1.1 91/01/15 18:00:12 bj Exp $
 *
 * $Log:	terminal.c,v $
 * Revision 1.1  91/01/15  18:00:12  bj
 * Initial revision
 * 
 *
 *------------------------------------------------------------------------
 */


/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <arpa/telnet.h>
#include <sys/types.h>

#include "ring.h"

#include "externs.h"
#include "types.h"

Ring	ttyoring, ttyiring;
char	ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ];

char
    termEofChar,
    termEraseChar,
    termFlushChar,
    termIntChar,
    termKillChar,
    termQuitChar;

/*
 * initialize the terminal data structures.
 */

/* --------------------------------------- */

void
init_terminal( void )
{
	if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) 
		{
		Exit(1);
		}
	if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) 
		{
		Exit(1);
		}
	autoflush = TerminalAutoFlush();
}


/* ------------------------------------------------------
 *		Send as much data as possible to the terminal.
 *
 *		The return value indicates whether we did any
 *	useful work.
 * ------------------------------------------------------
 */


int
ttyflush(int drop)
{
	register int n, n0, n1;
	register int x;  /* debug only */
	
	n0 = ring_full_count(&ttyoring);
	if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) 
		{
		if (drop) 
			{
			TerminalFlushOutput();
				/* we leave 'n' alone! */
			} 
		else 
			{
			n = TerminalWrite(ttyoring.consume, n);
			}
		}

	if (n > 0) 
		{
		/*
		 * If we wrote everything, and the full count is
		 * larger than what we wrote, then write the
		 * rest of the buffer.
		 */
		if (n1 == n && n0 > n) 
			{
			n1 = n0 - n;
			if (!drop)
				{
				n1 = TerminalWrite(ttyoring.bottom, n1);
				}
			n += n1;
			}
		ring_consumed(&ttyoring, n);
		}
	return n > 0;
}

/* ----------------------------------------------------------------------
 * These routines decides on what the mode should be (based on the values
 * of various global variables).
 * ----------------------------------------------------------------------
 */


int
getconnmode( void )
{

	static char newmode[16] = { 4, 5, 3, 3, 2, 2, 1, 1, 6, 6, 6, 6, 6, 6, 6, 6 };
	int modeindex = 0;

	if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) 
		{
		modeindex += 1;
		}

	if (hisopts[TELOPT_ECHO]) 
		{
		modeindex += 2;
		}

	if (hisopts[TELOPT_SGA]) 
		{
		modeindex += 4;
		}

	if (In3270) 
		{
		modeindex += 8;
		}

	 return newmode[modeindex];
}

void
setconnmode(void )
{
	TerminalNewMode(getconnmode());
}


void
setcommandmode( void )
{
	TerminalNewMode(0);
}
