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//===-- runtime/connection.cpp --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "connection.h"
#include "environment.h"
#include "io-stmt.h"
#include <algorithm>
namespace Fortran::runtime::io {
std::size_t ConnectionState::RemainingSpaceInRecord() const {
auto recl{recordLength.value_or(openRecl.value_or(
executionEnvironment.listDirectedOutputLineLengthLimit))};
return positionInRecord >= recl ? 0 : recl - positionInRecord;
}
bool ConnectionState::NeedAdvance(std::size_t width) const {
return positionInRecord > 0 && width > RemainingSpaceInRecord();
}
bool ConnectionState::IsAtEOF() const {
return endfileRecordNumber && currentRecordNumber >= *endfileRecordNumber;
}
bool ConnectionState::IsAfterEndfile() const {
return endfileRecordNumber && currentRecordNumber > *endfileRecordNumber;
}
void ConnectionState::HandleAbsolutePosition(std::int64_t n) {
positionInRecord = std::max(n, std::int64_t{0}) + leftTabLimit.value_or(0);
}
void ConnectionState::HandleRelativePosition(std::int64_t n) {
positionInRecord = std::max(leftTabLimit.value_or(0), positionInRecord + n);
}
SavedPosition::SavedPosition(IoStatementState &io) : io_{io} {
ConnectionState &conn{io_.GetConnectionState()};
saved_ = conn;
conn.pinnedFrame = true;
}
SavedPosition::~SavedPosition() {
ConnectionState &conn{io_.GetConnectionState()};
while (conn.currentRecordNumber > saved_.currentRecordNumber) {
io_.BackspaceRecord();
}
conn.leftTabLimit = saved_.leftTabLimit;
conn.furthestPositionInRecord = saved_.furthestPositionInRecord;
conn.positionInRecord = saved_.positionInRecord;
conn.pinnedFrame = saved_.pinnedFrame;
}
} // namespace Fortran::runtime::io
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