/*
 *  Copyright (C) 2002-2019  The DOSBox Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "dosbox.h"

#if C_MODEM
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <utility>

#include "support.h"
#include "serialport.h"
#include "softmodem.h"
#include "misc_util.h"

CSerialModem::CSerialModem(Bitu id, CommandLine* cmd)
	: CSerial(id, cmd),
	  rqueue(new CFifo(MODEM_BUFFER_QUEUE_SIZE)),
	  tqueue(new CFifo(MODEM_BUFFER_QUEUE_SIZE)),
	  cmdbuf {0},
	  commandmode(false),
	  echo(false),
	  oldDTRstate(false),
	  ringing(false),
	  numericresponse(false),
	  // Default to direct null modem connection; Telnet mode interprets IAC codes
	  telnetmode(false),
	  connected(false),
	  doresponse(0),
	  waiting_tx_character(0),
	  cmdpause(0),
	  ringtimer(0),
	  ringcount(0),
	  plusinc(0),
	  cmdpos(0),
	  flowcontrol(0),
	  tmpbuf {0},
	  listenport(23),
	  reg {0},
	  serversocket(nullptr),
	  clientsocket(nullptr),
	  waitingclientsocket(nullptr),
	  telClient {},
	  dial {}
{
	InstallationSuccessful=false;

	// Setup the listening port, and ignore the return code as this is optional
	(void) getBituSubstring("listenport:", &listenport, cmd);

	// TODO: Fix dialtones if requested
	//mhd.chan=MIXER_AddChannel((MIXER_MixHandler)this->MODEM_CallBack,8000,"MODEM");
	//MIXER_Enable(mhd.chan,false);
	//MIXER_SetMode(mhd.chan,MIXER_16MONO);

	CSerial::Init_Registers();
	Reset(); // reset calls EnterIdleState

	setEvent(SERIAL_POLLING_EVENT,1);
	InstallationSuccessful=true;
}

CSerialModem::~CSerialModem() {
	// remove events
	for (Bitu i = SERIAL_BASE_EVENT_COUNT+1; i <= SERIAL_MODEM_EVENT_COUNT; i++)
		removeEvent(i);
}

void CSerialModem::handleUpperEvent(Bit16u type) {
	switch (type) {
	case SERIAL_RX_EVENT: {
		// check for bytes to be sent to port
		if (CSerial::CanReceiveByte())
			if (rqueue->inuse() && (CSerial::getRTS() || (flowcontrol != 3))) {
				Bit8u rbyte = rqueue->getb();
				//LOG_MSG("Modem: sending byte %2x back to UART3",rbyte);
				CSerial::receiveByte(rbyte);
			}
		if(CSerial::CanReceiveByte()) setEvent(SERIAL_RX_EVENT, bytetime*0.98f);
		break;
	}
	case MODEM_TX_EVENT: {
		if (tqueue->left()) {
			tqueue->addb(waiting_tx_character);
			if (tqueue->left() < 2) {
				CSerial::setCTS(false);
			}
		} else {
			static Bits lcount=0;
			if (lcount < 1000) {
				lcount++;
				LOG_MSG("MODEM: TX Buffer overflow!");
			}
		}
		ByteTransmitted();
		break;
	}
	case SERIAL_POLLING_EVENT: {
		if (rqueue->inuse()) {
			removeEvent(SERIAL_RX_EVENT);
			setEvent(SERIAL_RX_EVENT, (float)0.01);
		}
		Timer2();
		setEvent(SERIAL_POLLING_EVENT,1);
		break;
	}

	case MODEM_RING_EVENT: {
		break;
	}
	}
}

void CSerialModem::SendLine(const char *line) {
	rqueue->addb(0xd);
	rqueue->addb(0xa);
	rqueue->adds((Bit8u *)line, strlen(line));
	rqueue->addb(0xd);
	rqueue->addb(0xa);
}

// only for numbers < 1000...
void CSerialModem::SendNumber(Bitu val) {
	rqueue->addb(0xd);
	rqueue->addb(0xa);

	rqueue->addb(val / 100 + '0');
	val = val%100;
	rqueue->addb(val / 10 + '0');
	val = val%10;
	rqueue->addb(val + '0');

	rqueue->addb(0xd);
	rqueue->addb(0xa);
}

void CSerialModem::SendRes(const ResTypes response) {
	char const * string = nullptr;
	Bitu code = -1;
	switch (response) {
		case ResOK:         code = 0; string = "OK"; break;
		case ResCONNECT:    code = 1; string = "CONNECT 57600"; break;
		case ResRING:       code = 2; string = "RING"; break;
		case ResNOCARRIER:  code = 3; string = "NO CARRIER"; break;
		case ResERROR:      code = 4; string = "ERROR"; break;
		case ResNODIALTONE: code = 6; string = "NO DIALTONE"; break;
		case ResBUSY:       code = 7; string = "BUSY"; break;
		case ResNOANSWER:   code = 8; string = "NO ANSWER"; break;
		case ResNONE:       return;
	}

	if(doresponse != 1) {
		if (doresponse == 2 && (response == ResRING ||
			response == ResCONNECT || response == ResNOCARRIER))
			return;
		if (numericresponse && code != static_cast<Bitu>(-1))
			SendNumber(code);
		else if (string != nullptr)
			SendLine(string);

		//if(CSerial::CanReceiveByte())	// very fast response
		//	if(rqueue->inuse() && CSerial::getRTS())
		//	{ Bit8u rbyte =rqueue->getb();
		//		CSerial::receiveByte(rbyte);
		//	LOG_MSG("Modem: sending byte %2x back to UART2",rbyte);
		//	}

		if (string != nullptr) {
			LOG_MSG("Modem response: %s", string);
		}
	}
}

bool CSerialModem::Dial(char * host) {

	// Scan host for port
	Bit16u port;
	char * hasport = strrchr(host,':');
	if (hasport) {
		*hasport++ = 0;
		port = (Bit16u)atoi(hasport);
	}
	else
		port = MODEM_DEFAULT_PORT;

	// Resolve host we're gonna dial
	LOG_MSG("Connecting to host %s port %u", host, port);
	clientsocket.reset(new TCPClientSocket(host, port));
	if (!clientsocket->isopen) {
		clientsocket.reset(nullptr);
		LOG_MSG("Failed to connect.");
		SendRes(ResNOCARRIER);
		EnterIdleState();
		return false;
	} else {
		EnterConnectedState();
		return true;
	}
}

void CSerialModem::AcceptIncomingCall(void) {
	if (waitingclientsocket) {
		clientsocket = std::move(waitingclientsocket);
		EnterConnectedState();
	} else {
		EnterIdleState();
	}
}

Bitu CSerialModem::ScanNumber(char * & scan) const {
	Bitu ret=0;
	while (char c = *scan) {
		if (c >= '0' && c <= '9') {
			ret*=10;
			ret+=c-'0';
			scan++;
		} else
			break;
	}
	return ret;
}

char CSerialModem::GetChar(char * & scan) const {
	char ch = *scan;
	scan++;
	return ch;
}

void CSerialModem::Reset(){
	EnterIdleState();
	cmdpos = 0;
	cmdbuf[0] = 0;
	oldDTRstate = getDTR();
	flowcontrol = 0;
	plusinc = 0;
	clientsocket.reset(nullptr);

	memset(&reg,0,sizeof(reg));
	reg[MREG_AUTOANSWER_COUNT] = 0;  // no autoanswer
	reg[MREG_RING_COUNT]       = 1;
	reg[MREG_ESCAPE_CHAR]      = '+';
	reg[MREG_CR_CHAR]          = '\r';
	reg[MREG_LF_CHAR]          = '\n';
	reg[MREG_BACKSPACE_CHAR]   = '\b';

	cmdpause = 0;
	echo = true;
	doresponse = 0;
	numericresponse = false;

	/* Default to direct null modem connection.  Telnet mode interprets IAC codes */
	telnetmode = false;
}

void CSerialModem::EnterIdleState(void){
	connected = false;
	ringing = false;
	clientsocket.reset(nullptr);
	waitingclientsocket.reset(nullptr);

	// get rid of everything
	if (serversocket) {
		waitingclientsocket.reset(serversocket->Accept());
		while (waitingclientsocket) {
			waitingclientsocket.reset(serversocket->Accept());
		}
	} else if (listenport) {

		serversocket.reset(new TCPServerSocket(listenport));
		if (!serversocket->isopen) {
			LOG_MSG("Serial%" PRIuPTR ": Modem could not open TCP port %" PRIuPTR ".",
			        COMNUMBER,
			        listenport);

			serversocket.reset(nullptr);
		} else
			LOG_MSG("Serial%" PRIuPTR ": Modem listening on port %" PRIuPTR "...",
			        COMNUMBER,
			        listenport);
	}
	waitingclientsocket.reset(nullptr);

	commandmode = true;
	CSerial::setCD(false);
	CSerial::setRI(false);
	CSerial::setDSR(true);
	CSerial::setCTS(true);
	tqueue->clear();
}

void CSerialModem::EnterConnectedState(void) {
	// we don't accept further calls
	serversocket.reset(nullptr);
	SendRes(ResCONNECT);
	commandmode = false;
	memset(&telClient, 0, sizeof(telClient));
	connected = true;
	ringing = false;
	CSerial::setCD(true);
	CSerial::setRI(false);
}

void CSerialModem::DoCommand() {
	cmdbuf[cmdpos] = 0;
	cmdpos = 0;			//Reset for next command
	upcase(cmdbuf);
	LOG_MSG("Command sent to modem: ->%s<-\n", cmdbuf);
	/* Check for empty line, stops dialing and autoanswer */
	if (!cmdbuf[0]) {
		reg[0] = 0;	// autoanswer off
		return;
	}
	//else {
		//MIXER_Enable(mhd.chan,false);
	//	dialing = false;
	//	SendRes(ResNOCARRIER);
	//	goto ret_none;
	//}
	/* AT command set interpretation */

	if ((cmdbuf[0] != 'A') || (cmdbuf[1] != 'T')) {
		SendRes(ResERROR);
		return;
	}
	if (strstr(cmdbuf,"NET0")) {
		telnetmode = false;
		SendRes(ResOK);
		return;
	}
	else if (strstr(cmdbuf,"NET1")) {
		telnetmode = true;
		SendRes(ResOK);
		return;
	}

	char * scanbuf = &cmdbuf[2];
	while (1) {
		// LOG_MSG("loopstart ->%s<-",scanbuf);
		char chr = GetChar(scanbuf);
		switch (chr) {
		case 'D': { // Dial
			char * foundstr = &scanbuf[0];
			if (*foundstr == 'T' || *foundstr == 'P')
				foundstr++;

			// Small protection against empty line and long string
			if ((!foundstr[0]) || (strlen(foundstr) > 100)) {
				SendRes(ResERROR);
				return;
			}
			// scan for and remove spaces; weird bug: with leading spaces in the string,
			// SDLNet_ResolveHost will return no error but not work anyway (win)
			while(foundstr[0] == ' ')
				foundstr++;

			char* helper = foundstr;
			helper+=strlen(foundstr);
			while(helper[0] == ' ') {
				helper[0] = 0;
				helper--;
			}

			//Large enough scope, so the buffers are still valid when reaching Dail.
			char buffer[128];
			char obuffer[128];
			if (strlen(foundstr) >= 12) {
				// Check if supplied parameter only consists of digits
				bool isNum = true;
				size_t fl = strlen(foundstr);
				for (size_t i = 0; i < fl; i++)
					if (foundstr[i] < '0' || foundstr[i] > '9')
						isNum = false;
				if (isNum) {
					// Parameter is a number with at least 12 digits => this cannot
					// be a valid IP/name
					// Transform by adding dots
					size_t j = 0;
					size_t foundlen = strlen(foundstr);
					for (size_t i = 0; i < foundlen; i++) {
						buffer[j++] = foundstr[i];
						// Add a dot after the third, sixth and ninth number
						if (i == 2 || i == 5 || i == 8)
							buffer[j++] = '.';
						// If the string is longer than 12 digits,
						// interpret the rest as port
						if (i == 11 && strlen(foundstr) > 12)
							buffer[j++] = ':';
					}
					buffer[j] = 0;
					foundstr = buffer;

					// Remove Zeros from beginning of octets
					size_t k = 0;
					size_t foundlen2 = strlen(foundstr);
					for (size_t i = 0; i < foundlen2; i++) {
						if (i == 0 && foundstr[0] == '0') continue;
						if (i == 1 && foundstr[0] == '0' && foundstr[1] == '0') continue;
						if (foundstr[i] == '0' && foundstr[i-1] == '.') continue;
						if (foundstr[i] == '0' && foundstr[i-1] == '0' && foundstr[i-2] == '.') continue;
						obuffer[k++] = foundstr[i];
						}
					obuffer[k] = 0;
					foundstr = obuffer;
				}
			}
			Dial(foundstr);
			return;
		}
		case 'I': // Some strings about firmware
			switch (ScanNumber(scanbuf)) {
			case 3: SendLine("DOSBox Emulated Modem Firmware V1.00"); break;
			case 4: SendLine("Modem compiled for DOSBox version " VERSION); break;
			}
			break;
		case 'E': // Echo on/off
			switch (ScanNumber(scanbuf)) {
			case 0: echo = false; break;
			case 1: echo = true; break;
			}
			break;
		case 'V':
			switch (ScanNumber(scanbuf)) {
			case 0: numericresponse = true; break;
			case 1: numericresponse = false; break;
			}
			break;
		case 'H': // Hang up
			switch (ScanNumber(scanbuf)) {
			case 0:
				if (connected) {
					SendRes(ResNOCARRIER);
					EnterIdleState();
					return;
				}
				// else return ok
			}
			break;
		case 'O': // Return to data mode
			switch (ScanNumber(scanbuf)) {
			case 0:
				if (clientsocket) {
					commandmode = false;
					return;
				} else {
					SendRes(ResERROR);
					return;
				}
			}
			break;
		case 'T': // Tone Dial
		case 'P': // Pulse Dial
			break;
		case 'M': // Monitor
		case 'L': // Volume
			ScanNumber(scanbuf);
			break;
		case 'A': // Answer call
			if (waitingclientsocket) {
				AcceptIncomingCall();
			} else {
				SendRes(ResERROR);
				return;
			}
			return;
		case 'Z': { // Reset and load profiles
			// scan the number away, if any
			ScanNumber(scanbuf);
			if (clientsocket)
				SendRes(ResNOCARRIER);
			Reset();
			break;
		}
		case ' ': // skip space
			break;
		case 'Q': {
			// Response options
			// 0 = all on, 1 = all off,
			// 2 = no ring and no connect/carrier in answermode
			Bitu val = ScanNumber(scanbuf);
			if (!(val > 2)) {
				doresponse = val;
				break;
			} else {
				SendRes(ResERROR);
				return;
			}
		}
		case 'S': { // Registers
			Bitu index = ScanNumber(scanbuf);
			if (index >= SREGS) {
				SendRes(ResERROR);
				return; //goto ret_none;
			}

			while (scanbuf[0] == ' ')
				scanbuf++; // skip spaces

			if (scanbuf[0] == '=') { // set register
				scanbuf++;
				while (scanbuf[0] == ' ')
					scanbuf++; // skip spaces
				Bitu val = ScanNumber(scanbuf);
				reg[index] = val;
				break;
			}
			else if (scanbuf[0] == '?') { // get register
				SendNumber(reg[index]);
				scanbuf++;
				break;
			}
			//else LOG_MSG("print reg %d with %d",index,reg[index]);
		}
		break;
		case '&': { // & escaped commands
			char cmdchar = GetChar(scanbuf);
			switch(cmdchar) {
				case 'K': {
					Bitu val = ScanNumber(scanbuf);
					if(val < 5)
						flowcontrol = val;
					else {
						SendRes(ResERROR);
						return;
					}
					break;
				}
				case '\0':
					// end of string
					SendRes(ResERROR);
					return;
				default:
					LOG_MSG("Modem: Unhandled command: &%c%" PRIuPTR,
					        cmdchar,
					        ScanNumber(scanbuf));
					break;
			}
			break;
		}
		case '\\': { // \ escaped commands
			char cmdchar = GetChar(scanbuf);
			switch (cmdchar) {
				case 'N':
					// error correction stuff - not emulated
					if (ScanNumber(scanbuf) > 5) {
						SendRes(ResERROR);
						return;
					}
					break;
				case '\0':
					// end of string
					SendRes(ResERROR);
					return;
				default:
					LOG_MSG("Modem: Unhandled command: \\%c%" PRIuPTR,
					        cmdchar,
					        ScanNumber(scanbuf));
					break;
			}
			break;
		}
		case '\0':
			SendRes(ResOK);
			return;
		default:
			LOG_MSG("Modem: Unhandled command: %c%" PRIuPTR,
			        chr,
			        ScanNumber(scanbuf));
			break;
		}
	}
}

void CSerialModem::TelnetEmulation(Bit8u * data, Bitu size) {
	Bitu i;
	Bit8u c;
	for (i=0; i < size; i++) {
		c = data[i];
		if (telClient.inIAC) {
			if (telClient.recCommand) {
				if ((c != 0) && (c != 1) && (c != 3)) {
					LOG_MSG("MODEM: Unrecognized option %u", c);
					if (telClient.command > 250) {
						/* Reject anything we don't recognize */
						tqueue->addb(0xff);
						tqueue->addb(252);
						tqueue->addb(c); /* We won't do crap! */
					}
			}
			switch (telClient.command) {
				case 251: /* Will */
					if (c == 0) telClient.binary[TEL_SERVER] = true;
					if (c == 1) telClient.echo[TEL_SERVER] = true;
					if (c == 3) telClient.supressGA[TEL_SERVER] = true;
					break;
				case 252: /* Won't */
					if (c == 0) telClient.binary[TEL_SERVER] = false;
					if (c == 1) telClient.echo[TEL_SERVER] = false;
					if (c == 3) telClient.supressGA[TEL_SERVER] = false;
					break;
				case 253: /* Do */
					if (c == 0) {
						telClient.binary[TEL_CLIENT] = true;
							tqueue->addb(0xff);
							tqueue->addb(251);
							tqueue->addb(0); /* Will do binary transfer */
					}
					if (c == 1) {
						telClient.echo[TEL_CLIENT] = false;
							tqueue->addb(0xff);
							tqueue->addb(252);
							tqueue->addb(1); /* Won't echo (too lazy) */
					}
					if (c == 3) {
						telClient.supressGA[TEL_CLIENT] = true;
							tqueue->addb(0xff);
							tqueue->addb(251);
							tqueue->addb(3); /* Will Suppress GA */
					}
					break;
				case 254: /* Don't */
					if (c == 0) {
						telClient.binary[TEL_CLIENT] = false;
							tqueue->addb(0xff);
							tqueue->addb(252);
							tqueue->addb(0); /* Won't do binary transfer */
					}
					if (c == 1) {
						telClient.echo[TEL_CLIENT] = false;
							tqueue->addb(0xff);
							tqueue->addb(252);
							tqueue->addb(1); /* Won't echo (fine by me) */
					}
					if (c == 3) {
						telClient.supressGA[TEL_CLIENT] = true;
							tqueue->addb(0xff);
							tqueue->addb(251);
							tqueue->addb(3); /* Will Suppress GA (too lazy) */
					}
					break;
				default:
					LOG_MSG("MODEM: Telnet client sent IAC %d", telClient.command);
					break;
			}
			telClient.inIAC = false;
			telClient.recCommand = false;
			continue;
		} else {
			if (c == 249) {
				/* Go Ahead received */
				telClient.inIAC = false;
				continue;
			}
			telClient.command = c;
			telClient.recCommand = true;

			if ((telClient.binary[TEL_SERVER]) && (c == 0xff)) {
				/* Binary data with value of 255 */
				telClient.inIAC = false;
				telClient.recCommand = false;
					rqueue->addb(0xff);
				continue;
			}
		}
	} else {
		if (c == 0xff) {
			telClient.inIAC = true;
			continue;
		}
			rqueue->addb(c);
		}
	}
}

void CSerialModem::Timer2(void) {

	bool sendbyte = true;
	Bitu usesize;
	Bit8u txval;
	Bitu txbuffersize =0;

	// Check for eventual break command
	if (!commandmode) cmdpause++;
	// Handle incoming data from serial port, read as much as available
	CSerial::setCTS(true);	// buffer will get 'emptier', new data can be received
	while (tqueue->inuse()) {
		txval = tqueue->getb();
		if (commandmode) {
			if (echo) {
				rqueue->addb(txval);
				//LOG_MSG("Echo back to queue: %x",txval);
			}
			if (txval == 0xa) continue; //Real modem doesn't seem to skip this?
			else if (txval == 0x8 && (cmdpos > 0)) --cmdpos; // backspace
			else if (txval == 0xd) DoCommand(); // return
			else if (txval != '+') {
				if(cmdpos<99) {
					cmdbuf[cmdpos] = txval;
					cmdpos++;
				}
			}
		}
		else {// + character
			// 1000 ticks have passed, can check for pause command
			if (cmdpause > 1000) {
				if (txval == reg[MREG_ESCAPE_CHAR]) // +
				{
					plusinc++;
					if (plusinc >= 3) {
						LOG_MSG("Modem: Entering command mode(escape sequence)");
						commandmode = true;
						SendRes(ResOK);
						plusinc = 0;
					}
					sendbyte=false;
				} else {
					plusinc=0;
				}
	// If not a special pause command, should go for bigger blocks to send
			}
			tmpbuf[txbuffersize] = txval;
			txbuffersize++;
		}
	} // while loop

	if (clientsocket && sendbyte && txbuffersize) {
		// down here it saves a lot of network traffic
		if (!clientsocket->SendArray(tmpbuf,txbuffersize)) {
			SendRes(ResNOCARRIER);
			EnterIdleState();
		}
	}
	// Handle incoming to the serial port
	if (!commandmode && clientsocket && rqueue->left()) {
		usesize = rqueue->left();
		if (usesize > 16)
			usesize = 16;
		if (!clientsocket->ReceiveArray(tmpbuf, &usesize)) {
			SendRes(ResNOCARRIER);
			EnterIdleState();
		} else if (usesize) {
			// Filter telnet commands
			if (telnetmode)
				TelnetEmulation(tmpbuf, usesize);
			else
				rqueue->adds(tmpbuf,usesize);
			cmdpause = 0;
		}
	}
	// Check for incoming calls
	if (!connected && !waitingclientsocket && serversocket) {
		waitingclientsocket.reset(serversocket->Accept());
		if (waitingclientsocket) {
			if (!CSerial::getDTR()) {
				// accept no calls with DTR off; TODO: AT &Dn
				EnterIdleState();
			} else {
				ringing = true;
				SendRes(ResRING);
				CSerial::setRI(!CSerial::getRI());
				//MIXER_Enable(mhd.chan,true);
				ringtimer = 3000;
				reg[1] = 0; //Reset ring counter reg
			}
		}
	}
	if (ringing) {
		if (ringtimer <= 0) {
			reg[1]++;
			if ((reg[0] > 0) && (reg[0] >= reg[1])) {
				AcceptIncomingCall();
				return;
			}
			SendRes(ResRING);
			CSerial::setRI(!CSerial::getRI());

			//MIXER_Enable(mhd.chan,true);
			ringtimer = 3000;
		}
		--ringtimer;
	}
}


//TODO
void CSerialModem::RXBufferEmpty() {
	// see if rqueue has some more bytes
	if (rqueue->inuse() && (CSerial::getRTS() || (flowcontrol != 3))){
		Bit8u rbyte = rqueue->getb();
		//LOG_MSG("Modem: sending byte %2x back to UART1",rbyte);
		CSerial::receiveByte(rbyte);
	}
}

void CSerialModem::transmitByte(Bit8u val, bool first) {
	waiting_tx_character = val;
	setEvent(MODEM_TX_EVENT, bytetime); // TX event
	if (first)
		ByteTransmitting();
	//LOG_MSG("MODEM: Byte %x to be transmitted",val);
}

void CSerialModem::updatePortConfig(Bit16u, Bit8u lcr) {
	(void) lcr; // deliberately unused but needed for API compliance
}

void CSerialModem::updateMSR() {
	// think it is not needed
}

void CSerialModem::setBreak(bool) {
	// TODO: handle this
}

void CSerialModem::setRTSDTR(bool rts_, bool dtr_) {
	(void) rts_; // deliberately unused but needed for API compliance
	setDTR(dtr_);
}
void CSerialModem::setRTS(bool val) {
	(void) val; // deliberately unused but but needed for API compliance
}
void CSerialModem::setDTR(bool val) {
	if (!val && connected) {
		// If DTR goes low, hang up.
		SendRes(ResNOCARRIER);
		EnterIdleState();
		LOG_MSG("Modem: Hang up due to dropped DTR.");
	}
}
/*
void CSerialModem::updateModemControlLines() {
	//bool txrdy=tqueue->left();
	//if(CSerial::getRTS() && txrdy) CSerial::setCTS(true);
	//else CSerial::setCTS(tqueue->left());

	// If DTR goes low, hang up.
	if(connected)
		if(oldDTRstate)
			if(!getDTR()) {
				SendRes(ResNOCARRIER);
				EnterIdleState();
				LOG_MSG("Modem: Hang up due to dropped DTR.");
			}

	oldDTRstate = getDTR();
}
*/

#endif
