89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
/*
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* This file is part of the "bluetoothheater" distribution
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* (https://gitlab.com/mrjones.id.au/bluetoothheater)
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*
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* Copyright (C) 2018 Ray Jones <ray@mrjones.id.au>
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* Copyright (C) 2018 James Clark
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include "ABTelnetSpy.h"
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ABTelnetSpy::ABTelnetSpy() : TelnetSpy() {
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_enabled = true;
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_CRtimeout = 0;
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_pending = 0;
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}
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size_t
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ABTelnetSpy::write(uint8_t val) {
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if(_enabled) {
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return TelnetSpy::write(val);
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}
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return 0;
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}
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void
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ABTelnetSpy::enable(bool state)
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{
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_enabled = state;
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}
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// typical problem we have with terminal software that may or may not send CR/LF
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// when a user hits ENTER.
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// This method will inject a LF if none was received within a period of time
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bool
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ABTelnetSpy::getch(char& rxVal)
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{
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if(_CRtimeout) {
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// have received a CR, now in wait interval for a LF
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long diff = millis() - _CRtimeout;
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if(available()) {
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// a character is sitting in the debug input
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// grab it and check if it is a LF, if so do not retain and return a faked LF
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// otherwise retain for next pass, and return a faked LF now
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_pending = read(); // read pending character
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if(_pending == '\n') { // if it's a LF, a normal CR/LF occured
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_pending = 0; // cancel retention
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}
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diff = 1; // force timeout to happen now
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}
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if(diff > 0) {
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// timed out waiting for a LF, inject one now
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_CRtimeout = 0; // reset timeout
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rxVal = '\n'; // force a LF response
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return true; // rxVal is valid
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}
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return false; // no character ready
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}
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// dispose of any character that may have been received during CR/LF timeout
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if(_pending) {
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rxVal = _pending;
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_pending = 0;
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return true;
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}
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if(available()) {
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rxVal = read(); // read incoming character
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if(rxVal == '\r') { // if it's a CR, start the timeout
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_CRtimeout = (millis() + _LFPERIOD) | 1; // ensure always non zero
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}
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return true; // rxVal is valid
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}
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return false; // no character ready
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}
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