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//===-- runtime/internal-unit.h ---------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
// Fortran internal I/O "units"
#ifndef FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_
#define FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_
#include "connection.h"
#include "flang/Runtime/descriptor.h"
#include <cinttypes>
#include <type_traits>
namespace Fortran::runtime::io {
class IoErrorHandler;
// Points to (but does not own) a CHARACTER scalar or array for internal I/O.
// Does not buffer.
template <Direction DIR> class InternalDescriptorUnit : public ConnectionState {
public:
using Scalar =
std::conditional_t<DIR == Direction::Input, const char *, char *>;
RT_API_ATTRS InternalDescriptorUnit(Scalar, std::size_t chars, int kind);
RT_API_ATTRS InternalDescriptorUnit(const Descriptor &, const Terminator &);
RT_API_ATTRS bool Emit(const char *, std::size_t, IoErrorHandler &);
RT_API_ATTRS std::size_t GetNextInputBytes(const char *&, IoErrorHandler &);
RT_API_ATTRS std::size_t ViewBytesInRecord(const char *&, bool forward) const;
RT_API_ATTRS bool AdvanceRecord(IoErrorHandler &);
RT_API_ATTRS void BackspaceRecord(IoErrorHandler &);
RT_API_ATTRS std::int64_t InquirePos();
private:
RT_API_ATTRS Descriptor &descriptor() {
return staticDescriptor_.descriptor();
}
RT_API_ATTRS const Descriptor &descriptor() const {
return staticDescriptor_.descriptor();
}
RT_API_ATTRS Scalar CurrentRecord() const {
return descriptor().template ZeroBasedIndexedElement<char>(
currentRecordNumber - 1);
}
RT_API_ATTRS void BlankFill(char *, std::size_t);
RT_API_ATTRS void BlankFillOutputRecord();
StaticDescriptor<maxRank, true /*addendum*/> staticDescriptor_;
};
extern template class InternalDescriptorUnit<Direction::Output>;
extern template class InternalDescriptorUnit<Direction::Input>;
} // namespace Fortran::runtime::io
#endif // FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_
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