mirror of
https://github.com/QuantumLeaps/qpcpp.git
synced 2025-01-28 06:02:56 +08:00
66 lines
2.7 KiB
C++
66 lines
2.7 KiB
C++
//****************************************************************************
|
|
// Product: QS/C++
|
|
// Last Updated for Version: 5.1.0
|
|
// Date of the Last Update: Sep 23, 2013
|
|
//
|
|
// Q u a n t u m L e a P s
|
|
// ---------------------------
|
|
// innovating embedded systems
|
|
//
|
|
// Copyright (C) 2002-2013 Quantum Leaps, LLC. All rights reserved.
|
|
//
|
|
// This program is open source 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.
|
|
//
|
|
// Alternatively, this program may be distributed and modified under the
|
|
// terms of Quantum Leaps commercial licenses, which expressly supersede
|
|
// the GNU General Public License and are specifically designed for
|
|
// licensees interested in retaining the proprietary status of their code.
|
|
//
|
|
// 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, see <http://www.gnu.org/licenses/>.
|
|
//
|
|
// Contact information:
|
|
// Quantum Leaps Web sites: http://www.quantum-leaps.com
|
|
// http://www.state-machine.com
|
|
// e-mail: info@quantum-leaps.com
|
|
//****************************************************************************
|
|
#include "qs_pkg.h"
|
|
|
|
/// \file
|
|
/// \ingroup qs
|
|
/// \brief QS::getByte() implementation
|
|
|
|
namespace QP {
|
|
|
|
//............................................................................
|
|
uint16_t QS::getByte(void) {
|
|
uint16_t ret;
|
|
if (priv_.used == static_cast<QSCtr>(0)) {
|
|
ret = QS_EOD; // set End-Of-Data
|
|
}
|
|
else {
|
|
uint8_t *buf_ = priv_.buf; // put in a temporary (register)
|
|
QSCtr tail_ = priv_.tail; // put in a temporary (register)
|
|
ret = static_cast<uint16_t>(*QS_PTR_AT_(tail_)); // the byte to return
|
|
++tail_; // advance the tail
|
|
if (tail_ == priv_.end) { // tail wrap around?
|
|
tail_ = static_cast<QSCtr>(0);
|
|
}
|
|
priv_.tail = tail_; // update the tail
|
|
--priv_.used; // one less byte used
|
|
}
|
|
return ret; // return the byte or EOD
|
|
}
|
|
|
|
} // namespace QP
|
|
|
|
|