54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
//===-- runtime/internal-unit.h ---------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Fortran internal I/O "units"
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#ifndef FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_
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#define FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_
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#include "connection.h"
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#include "descriptor.h"
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#include <cinttypes>
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#include <type_traits>
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namespace Fortran::runtime::io {
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class IoErrorHandler;
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// Points to (but does not own) a CHARACTER scalar or array for internal I/O.
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// Does not buffer.
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template <Direction DIR> class InternalDescriptorUnit : public ConnectionState {
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public:
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using Scalar =
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std::conditional_t<DIR == Direction::Input, const char *, char *>;
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InternalDescriptorUnit(Scalar, std::size_t);
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InternalDescriptorUnit(const Descriptor &, const Terminator &);
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void EndIoStatement();
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bool Emit(const char *, std::size_t, IoErrorHandler &);
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std::optional<char32_t> GetCurrentChar(IoErrorHandler &);
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bool AdvanceRecord(IoErrorHandler &);
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void BackspaceRecord(IoErrorHandler &);
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private:
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Descriptor &descriptor() { return staticDescriptor_.descriptor(); }
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const Descriptor &descriptor() const {
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return staticDescriptor_.descriptor();
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}
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Scalar CurrentRecord() const {
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return descriptor().template ZeroBasedIndexedElement<char>(
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currentRecordNumber - 1);
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}
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StaticDescriptor<maxRank, true /*addendum*/> staticDescriptor_;
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};
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extern template class InternalDescriptorUnit<Direction::Output>;
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extern template class InternalDescriptorUnit<Direction::Input>;
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} // namespace Fortran::runtime::io
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#endif // FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_
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