/* Copyright (c) 1988, 1990, 1993                                            */
/* The Regents of the University of California.  All rights reserved.        */
/*                                                                           */
/* Redistribution and use in source and binary forms, with or without        */
/* modification, are permitted provided that the following conditions        */
/* are met:                                                                  */
/* 1. Redistributions of source code must retain the above copyright         */
/* notice, this list of conditions and the following disclaimer.             */
/* 2. Redistributions in binary form must reproduce the above copyright      */
/* notice, this list of conditions and the following disclaimer in the       */
/* documentation and/or other materials provided with the distribution.      */
/* 3. All advertising materials mentioning features or use of this           */
/* software must display the following acknowledgement:                      */
/*   This product includes software developed by the University of           */
/*   California, Berkeley and its contributors.                              */
/* 4. Neither the name of the University nor the names of its contributors   */
/* may be used to endorse or promote products derived from this software     */
/* without specific prior written permission.                                */
/*                                                                           */
/* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND   */
/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE     */
/* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR        */
/* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE */
/* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR       */
/* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF      */
/* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  */
/* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN   */
/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)   */
/* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF    */
/* THE POSSIBILITY OF SUCH DAMAGE.                                           */

#ifdef SHOW_SCCSIDS
static char sccsid[] = "@(#)terminal.c	8.2 (Berkeley) 2/16/95";
#endif

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

#include "ring.h"

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

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

int termdata;			/* Debugging flag */

#ifdef	USE_TERMIO
# ifndef VDISCARD
cc_t termFlushChar;
# endif
# ifndef VLNEXT
cc_t termLiteralNextChar;
# endif
# ifndef VSUSP
cc_t termSuspChar;
# endif
# ifndef VWERASE
cc_t termWerasChar;
# endif
# ifndef VREPRINT
cc_t termRprntChar;
# endif
# ifndef VSTART
cc_t termStartChar;
# endif
# ifndef VSTOP
cc_t termStopChar;
# endif
# ifndef VEOL
cc_t termForw1Char;
# endif
# ifndef VEOL2
cc_t termForw2Char;
# endif
# ifndef VSTATUS
cc_t termAytChar;
# endif
#else
cc_t termForw2Char;
cc_t termAytChar;
#endif

/*
 * initialize the terminal data structures.
 */

    void
init_terminal()
{
    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.
 *
 *		Return value:
 *			-1: No useful work done, data waiting to go out.
 *			 0: No data was waiting, so nothing was done.
 *			 1: All waiting data was written out.
 *			 n: All data - n was written out.
 */


    int
ttyflush(drop)
    int drop;
{
    register int n, n0, n1;

    n0 = ring_full_count(&ttyoring);
    if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) {
	if (drop) {
	    TerminalFlushOutput();
	    /* we leave 'n' alone! */
	} else {
	    n = TerminalWrite((char *)ttyoring.consume, n);
	}
    }
    if (n > 0) {
	if (termdata && n) {
	    Dump('>', ttyoring.consume, n);
	}
	/*
	 * 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((char *)ttyoring.bottom, n1);
		if (n1 > 0)
			n += n1;
	}
	ring_consumed(&ttyoring, n);
    }
    if (n < 0)
	return -1;
    if (n == n0) {
	if (n0)
	    return -1;
	return 0;
    }
    return n0 - n + 1;
}

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


    int
getconnmode()
{
    extern int linemode;
    int mode = 0;
#ifdef	KLUDGELINEMODE
    extern int kludgelinemode;
#endif

    if (In3270)
	return(MODE_FLOW);

    if (my_want_state_is_dont(TELOPT_ECHO))
	mode |= MODE_ECHO;

    if (localflow)
	mode |= MODE_FLOW;

    if (my_want_state_is_will(TELOPT_BINARY))
	mode |= MODE_INBIN;

    if (his_want_state_is_will(TELOPT_BINARY))
	mode |= MODE_OUTBIN;

#ifdef	KLUDGELINEMODE
    if (kludgelinemode) {
	if (my_want_state_is_dont(TELOPT_SGA)) {
	    mode |= (MODE_TRAPSIG|MODE_EDIT);
	    if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
		mode &= ~MODE_ECHO;
	    }
	}
	return(mode);
    }
#endif
    if (my_want_state_is_will(TELOPT_LINEMODE))
	mode |= linemode;
    return(mode);
}

    void
setconnmode(force)
    int force;
{
    register int newmode;

    newmode = getconnmode()|(force?MODE_FORCE:0);

    TerminalNewMode(newmode);


}


    void
setcommandmode()
{
    TerminalNewMode(-1);
}