tn3270.c

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/* 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[] = "@(#)tn3270.c	8.2 (Berkeley) 5/30/95";
#endif

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

#include "general.h"

#include "defines.h"
#include "ring.h"
#include "externs.h"
#include "fdset.h"

#ifdef TN3270
#include "../ctlr/screen.h"
#include "../general/globals.h"

#include "../sys_curses/telextrn.h"
#include "../ctlr/externs.h"

int HaveInput;		    /* There is input available to scan              */
int cursesdata; 	    /* Do we dump curses data?                       */
int sigiocount;		    /* Number of times we got a SIGIO                */

char tline[200];
char *transcom = 0;	    /* transparent mode command (default: none)      */

char Ibuf[8*BUFSIZ], *Ifrontp, *Ibackp;

static char sb_terminal[] = { IAC, SB, TELOPT_TTYPE, TELQUAL_IS, 'I', 'B', 'M',
			      '-', '3', '2', '7', '8', '-', '2', IAC, SE };

#define	SBTERMMODEL	13

static int Sent3270TerminalType; /* Have we said we are a 3270?              */
#endif


void init_3270() {
#ifdef TN3270
    HaveInput = 0;
    sigiocount = 0;
    Sent3270TerminalType = 0;
    Ifrontp = Ibackp = Ibuf;
    init_ctlr();		/* Initialize some things */
    init_keyboard();
    init_screen();
    init_system();
#endif	/* defined(TN3270) */
}


#ifdef TN3270

/* DataToNetwork - queue up some data to go to network.  If "done" is set,   */
/* then when last byte is queued, we add on an IAC EOR sequence (so, don't   */
/* call us with "done" until you want that done...)                          */
/*                                                                           */
/* We actually do send all the data to the network buffer, since our only    */
/* client needs for us to do that.                                           */
int DataToNetwork(register char *buffer, register int count, int done) {
    register int loop, c;
    int origCount;

    origCount = count;

    while (count) {
	/* If not enough room for EORs, IACs, etc., wait */
	if (NETROOM() < 6) {
	    fd_set o;

	    FD_ZERO(&o);
	    netflush();
	    while (NETROOM() < 6) {
		FD_SET(net, &o);
		(void) select(net+1, (fd_set *) 0, &o, (fd_set *) 0,
						(struct timeval *) 0);
		netflush();
	    }
	}
	c = ring_empty_count(&netoring);
	if (c > count) {
	    c = count;
	}
	loop = c;
	while (loop) {
	    if (((unsigned char)*buffer) == IAC) {
		break;
	    }
	    buffer++;
	    loop--;
	}
	if ((c = c-loop)) {
	    ring_supply_data(&netoring, buffer-c, c);
	    count -= c;
	}
	if (loop) {
	    NET2ADD(IAC, IAC);
	    count--;
	    buffer++;
	}
    }

    if (done) {
	NET2ADD(IAC, EOR);
	netflush();		/* try to move along as quickly as ... */
    }
    return(origCount - count);
}


void inputAvailable(int signo) {
    HaveInput = 1;
    sigiocount++;
}

void outputPurge() {
    (void)ttyflush(1);
}


/* The following routines are places where the various tn3270 routines make  */
/* calls into telnet.c.                                                      */

/* DataToTerminal - queue up some data to go to terminal.                    */
/*                                                                           */
/* Note: there are people who call us and depend on our processing *all* the */
/* data at one time (thus the select).                                       */
int DataToTerminal(register char *buffer, register int count) {
    register int c;
    int origCount;

    origCount = count;

    while (count) {
	if (TTYROOM() == 0) {
	    fd_set o;

	    FD_ZERO(&o);
	    (void) ttyflush(0);
	    while (TTYROOM() == 0) {
		FD_SET(tout, &o);
		(void) select(tout+1, (fd_set *) 0, &o, (fd_set *) 0,
						(struct timeval *) 0);
		(void) ttyflush(0);
	    }
	}
	c = TTYROOM();
	if (c > count) {
	    c = count;
	}
	ring_supply_data(&ttyoring, buffer, c);
	count -= c;
	buffer += c;
    }
    return(origCount);
}


/* Push3270 - Try to send data along the 3270 output (to screen)             */
/* direction.                                                                */
int Push3270() {
    int save = ring_full_count(&netiring);

    if (save) {
	if (Ifrontp+save > Ibuf+sizeof Ibuf) {
	    if (Ibackp != Ibuf) {
		memmove(Ibuf, Ibackp, Ifrontp-Ibackp);
		Ifrontp -= (Ibackp-Ibuf);
		Ibackp = Ibuf;
	    }
	}
	if (Ifrontp+save < Ibuf+sizeof Ibuf) {
	    (void)telrcv();
	}
    }
    return save != ring_full_count(&netiring);
}


/* Finish3270 - get the last dregs of 3270 data out to the terminal          */
/* before quitting.                                                          */

void Finish3270() {
    while (Push3270() || !DoTerminalOutput()) {
	HaveInput = 0;
    }
}


/* StringToTerminal - output a null terminated string to the terminal */

void StringToTerminal(char *s) {
    int count;

    count = strlen(s);
    if (count) {
	(void) DataToTerminal(s, count);	/* we know it always goes... */
    }
}


#if ((!defined(NOT43)) || defined(PUTCHAR))
/* _putchar - output a single character to the terminal.  This name is so that
 *	curses(3x) can call us to send out data.
 */

void _putchar(char c) {
#if defined(sun) && !defined(__svr4__) /* SunOS 4.0 bug */
    c &= 0x7f;
#endif	/* defined(sun) */
    if (cursesdata) {
	Dump('>', &c, 1);
    }

    if (!TTYROOM()) {
	(void) DataToTerminal(&c, 1);
    } else {
	TTYADD(c);
    }
}
#endif	/* ((!defined(NOT43)) || defined(PUTCHAR)) */

void SetIn3270() {
    if (Sent3270TerminalType && my_want_state_is_will(TELOPT_BINARY)
		&& my_want_state_is_do(TELOPT_BINARY) && !donebinarytoggle) {
	if (!In3270) {
	    In3270 = 1;
	    Init3270();		/* Initialize 3270 functions */

    	    /* initialize terminal key mapping */
	    InitTerminal();	/* Start terminal going */
	    setconnmode(0);
	}
    } else {
	if (In3270) {
	    StopScreen(1);
	    In3270 = 0;
	    Stop3270();		/* Tell 3270 we aren't here anymore */
	    setconnmode(0);
	}
    }
}

/* tn3270_ttype()                                                            */
/*                                                                           */
/* Send a response to a terminal type negotiation.                           */
/* Return '0' if no more responses to send; '1' if a response sent.          */
int tn3270_ttype() {
    /* Try to send a 3270 type terminal name.  Decide which one based on the */
    /* format of our screen, and (in the future) color capaiblities.         */

    InitTerminal();		/* Sets MaxNumberColumns, MaxNumberLines */
    if ((MaxNumberLines >= 24) && (MaxNumberColumns >= 80)) {
	Sent3270TerminalType = 1;
	if ((MaxNumberLines >= 27) && (MaxNumberColumns >= 132)) {
	    MaxNumberLines = 27;
	    MaxNumberColumns = 132;
	    sb_terminal[SBTERMMODEL] = '5';
	} else if (MaxNumberLines >= 43) {
	    MaxNumberLines = 43;
	    MaxNumberColumns = 80;
	    sb_terminal[SBTERMMODEL] = '4';
	} else if (MaxNumberLines >= 32) {
	    MaxNumberLines = 32;
	    MaxNumberColumns = 80;
	    sb_terminal[SBTERMMODEL] = '3';
	} else {
	    MaxNumberLines = 24;
	    MaxNumberColumns = 80;
	    sb_terminal[SBTERMMODEL] = '2';
	}
	NumberLines = 24;		/* before we start out... */
	NumberColumns = 80;
	ScreenSize = NumberLines*NumberColumns;
	if ((MaxNumberLines*MaxNumberColumns) > MAXSCREENSIZE) {
	    ExitString("Programming error:  MAXSCREENSIZE too small.\n",
								1);
	    /*NOTREACHED*/
	}
	printsub('>', sb_terminal+2, sizeof sb_terminal-2);
	ring_supply_data(&netoring, sb_terminal, sizeof sb_terminal);
	return 1;
    } else {
	return 0;
    }
}

int settranscom(int argc, char *argv[]) {
	int i;

	if (argc == 1 && transcom) {
	   transcom = 0;
	}
	if (argc == 1) {
	   return 1;
	}
	transcom = tline;
	(void) strcpy(transcom, argv[1]);
	for (i = 2; i < argc; ++i) {
	    (void) strcat(transcom, " ");
	    (void) strcat(transcom, argv[i]);
	}
	return 1;
}

#endif	/* defined(TN3270) */