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https://github.com/QuantumLeaps/qpcpp.git
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72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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// Product: QS/C++
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// Last Updated for Version: 4.4.00
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// Date of the Last Update: Mar 28, 2012
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//
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// Q u a n t u m L e a P s
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// ---------------------------
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// innovating embedded systems
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//
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// Copyright (C) 2002-2012 Quantum Leaps, LLC. All rights reserved.
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//
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// This program is open source software: you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 2 of the License, or
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// (at your option) any later version.
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//
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// Alternatively, this program may be distributed and modified under the
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// terms of Quantum Leaps commercial licenses, which expressly supersede
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// the GNU General Public License and are specifically designed for
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// licensees interested in retaining the proprietary status of their code.
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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 <http://www.gnu.org/licenses/>.
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//
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// Contact information:
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// Quantum Leaps Web sites: http://www.quantum-leaps.com
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// http://www.state-machine.com
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// e-mail: info@quantum-leaps.com
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//////////////////////////////////////////////////////////////////////////////
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#include "qs_pkg.h"
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/// \file
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/// \ingroup qs
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/// \brief QS::getBlock() implementation
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QP_BEGIN_
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//............................................................................
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// get up to *pn bytes of contiguous memory
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uint8_t const *QS::getBlock(uint16_t * const pNbytes) {
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uint8_t *block;
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if (QS_used_ == static_cast<QSCtr>(0)) {
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*pNbytes = static_cast<uint16_t>(0);
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block = static_cast<uint8_t *>(0); // no bytes to return right now
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}
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else {
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QSCtr n = static_cast<QSCtr>(QS_end_ - QS_tail_);
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if (n > QS_used_) {
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n = QS_used_;
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}
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if (n > static_cast<QSCtr>(*pNbytes)) {
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n = static_cast<QSCtr>(*pNbytes);
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}
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*pNbytes = static_cast<uint16_t>(n);
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QS_used_ = static_cast<QSCtr>(QS_used_ - n);
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QSCtr t = QS_tail_;
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QS_tail_ = static_cast<QSCtr>(QS_tail_ + n);
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if (QS_tail_ == QS_end_) {
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QS_tail_ = static_cast<QSCtr>(0);
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}
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block = &QS_PTR_AT_(t);
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}
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return block;
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}
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QP_END_
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