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1 //===-- runtime/connection.h ------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 // Fortran I/O connection state (abstracted over internal & external units)
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10
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11 #ifndef FORTRAN_RUNTIME_IO_CONNECTION_H_
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12 #define FORTRAN_RUNTIME_IO_CONNECTION_H_
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13
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14 #include "format.h"
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15 #include <cinttypes>
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16 #include <optional>
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17
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18 namespace Fortran::runtime::io {
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19
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20 enum class Direction { Output, Input };
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21 enum class Access { Sequential, Direct, Stream };
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22
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23 inline bool IsRecordFile(Access a) { return a != Access::Stream; }
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24
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25 // These characteristics of a connection are immutable after being
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26 // established in an OPEN statement.
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27 struct ConnectionAttributes {
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28 Access access{Access::Sequential}; // ACCESS='SEQUENTIAL', 'DIRECT', 'STREAM'
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29 std::optional<std::int64_t> recordLength; // RECL= when fixed-length
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30 bool isUnformatted{false}; // FORM='UNFORMATTED'
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31 bool isUTF8{false}; // ENCODING='UTF-8'
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32 };
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33
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34 struct ConnectionState : public ConnectionAttributes {
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35 bool IsAtEOF() const; // true when read has hit EOF or endfile record
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36 std::size_t RemainingSpaceInRecord() const;
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37 void HandleAbsolutePosition(std::int64_t);
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38 void HandleRelativePosition(std::int64_t);
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39
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40 // Positions in a record file (sequential or direct, not stream)
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41 std::int64_t currentRecordNumber{1}; // 1 is first
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42 std::int64_t positionInRecord{0}; // offset in current record
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43 std::int64_t furthestPositionInRecord{0}; // max(positionInRecord)
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44 bool nonAdvancing{false}; // ADVANCE='NO'
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45
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46 // Set at end of non-advancing I/O data transfer
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47 std::optional<std::int64_t> leftTabLimit; // offset in current record
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48
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49 // currentRecordNumber value captured after ENDFILE/REWIND/BACKSPACE statement
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50 // or an end-of-file READ condition on a sequential access file
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51 std::optional<std::int64_t> endfileRecordNumber;
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52
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53 // Mutable modes set at OPEN() that can be overridden in READ/WRITE & FORMAT
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54 MutableModes modes; // BLANK=, DECIMAL=, SIGN=, ROUND=, PAD=, DELIM=, kP
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55 };
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56 } // namespace Fortran::runtime::io
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57 #endif // FORTRAN_RUNTIME_IO_CONNECTION_H_
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