1 //===-- runtime/io-stmt.cpp -----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "io-stmt.h"
10 #include "connection.h"
11 #include "format.h"
12 #include "tools.h"
13 #include "unit.h"
14 #include "flang/Runtime/memory.h"
15 #include <algorithm>
16 #include <cstdio>
17 #include <cstring>
18 #include <limits>
19 
20 namespace Fortran::runtime::io {
21 
22 int IoStatementBase::EndIoStatement() { return GetIoStat(); }
23 
24 bool IoStatementBase::Emit(const char *, std::size_t, std::size_t) {
25   return false;
26 }
27 
28 bool IoStatementBase::Emit(const char *, std::size_t) { return false; }
29 
30 bool IoStatementBase::Emit(const char16_t *, std::size_t) { return false; }
31 
32 bool IoStatementBase::Emit(const char32_t *, std::size_t) { return false; }
33 
34 std::size_t IoStatementBase::GetNextInputBytes(const char *&p) {
35   p = nullptr;
36   return 0;
37 }
38 
39 bool IoStatementBase::AdvanceRecord(int) { return false; }
40 
41 void IoStatementBase::BackspaceRecord() {}
42 
43 bool IoStatementBase::Receive(char *, std::size_t, std::size_t) {
44   return false;
45 }
46 
47 std::optional<DataEdit> IoStatementBase::GetNextDataEdit(
48     IoStatementState &, int) {
49   return std::nullopt;
50 }
51 
52 ExternalFileUnit *IoStatementBase::GetExternalFileUnit() const {
53   return nullptr;
54 }
55 
56 bool IoStatementBase::BeginReadingRecord() { return true; }
57 
58 void IoStatementBase::FinishReadingRecord() {}
59 
60 void IoStatementBase::HandleAbsolutePosition(std::int64_t) {}
61 
62 void IoStatementBase::HandleRelativePosition(std::int64_t) {}
63 
64 bool IoStatementBase::Inquire(InquiryKeywordHash, char *, std::size_t) {
65   return false;
66 }
67 
68 bool IoStatementBase::Inquire(InquiryKeywordHash, bool &) { return false; }
69 
70 bool IoStatementBase::Inquire(InquiryKeywordHash, std::int64_t, bool &) {
71   return false;
72 }
73 
74 bool IoStatementBase::Inquire(InquiryKeywordHash, std::int64_t &) {
75   return false;
76 }
77 
78 void IoStatementBase::BadInquiryKeywordHashCrash(InquiryKeywordHash inquiry) {
79   char buffer[16];
80   const char *decode{InquiryKeywordHashDecode(buffer, sizeof buffer, inquiry)};
81   Crash("bad InquiryKeywordHash 0x%x (%s)", inquiry,
82       decode ? decode : "(cannot decode)");
83 }
84 
85 template <Direction DIR, typename CHAR>
86 InternalIoStatementState<DIR, CHAR>::InternalIoStatementState(
87     Buffer scalar, std::size_t length, const char *sourceFile, int sourceLine)
88     : IoStatementBase{sourceFile, sourceLine}, unit_{scalar, length} {}
89 
90 template <Direction DIR, typename CHAR>
91 InternalIoStatementState<DIR, CHAR>::InternalIoStatementState(
92     const Descriptor &d, const char *sourceFile, int sourceLine)
93     : IoStatementBase{sourceFile, sourceLine}, unit_{d, *this} {}
94 
95 template <Direction DIR, typename CHAR>
96 bool InternalIoStatementState<DIR, CHAR>::Emit(
97     const CharType *data, std::size_t chars) {
98   if constexpr (DIR == Direction::Input) {
99     Crash("InternalIoStatementState<Direction::Input>::Emit() called");
100     return false;
101   }
102   return unit_.Emit(data, chars * sizeof(CharType), *this);
103 }
104 
105 template <Direction DIR, typename CHAR>
106 std::size_t InternalIoStatementState<DIR, CHAR>::GetNextInputBytes(
107     const char *&p) {
108   return unit_.GetNextInputBytes(p, *this);
109 }
110 
111 template <Direction DIR, typename CHAR>
112 bool InternalIoStatementState<DIR, CHAR>::AdvanceRecord(int n) {
113   while (n-- > 0) {
114     if (!unit_.AdvanceRecord(*this)) {
115       return false;
116     }
117   }
118   return true;
119 }
120 
121 template <Direction DIR, typename CHAR>
122 void InternalIoStatementState<DIR, CHAR>::BackspaceRecord() {
123   unit_.BackspaceRecord(*this);
124 }
125 
126 template <Direction DIR, typename CHAR>
127 int InternalIoStatementState<DIR, CHAR>::EndIoStatement() {
128   if constexpr (DIR == Direction::Output) {
129     unit_.EndIoStatement(); // fill
130   }
131   auto result{IoStatementBase::EndIoStatement()};
132   if (free_) {
133     FreeMemory(this);
134   }
135   return result;
136 }
137 
138 template <Direction DIR, typename CHAR>
139 void InternalIoStatementState<DIR, CHAR>::HandleAbsolutePosition(
140     std::int64_t n) {
141   return unit_.HandleAbsolutePosition(n);
142 }
143 
144 template <Direction DIR, typename CHAR>
145 void InternalIoStatementState<DIR, CHAR>::HandleRelativePosition(
146     std::int64_t n) {
147   return unit_.HandleRelativePosition(n);
148 }
149 
150 template <Direction DIR, typename CHAR>
151 InternalFormattedIoStatementState<DIR, CHAR>::InternalFormattedIoStatementState(
152     Buffer buffer, std::size_t length, const CHAR *format,
153     std::size_t formatLength, const char *sourceFile, int sourceLine)
154     : InternalIoStatementState<DIR, CHAR>{buffer, length, sourceFile,
155           sourceLine},
156       ioStatementState_{*this}, format_{*this, format, formatLength} {}
157 
158 template <Direction DIR, typename CHAR>
159 InternalFormattedIoStatementState<DIR, CHAR>::InternalFormattedIoStatementState(
160     const Descriptor &d, const CHAR *format, std::size_t formatLength,
161     const char *sourceFile, int sourceLine)
162     : InternalIoStatementState<DIR, CHAR>{d, sourceFile, sourceLine},
163       ioStatementState_{*this}, format_{*this, format, formatLength} {}
164 
165 template <Direction DIR, typename CHAR>
166 int InternalFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
167   if constexpr (DIR == Direction::Output) {
168     format_.Finish(*this); // ignore any remaining input positioning actions
169   }
170   return InternalIoStatementState<DIR, CHAR>::EndIoStatement();
171 }
172 
173 template <Direction DIR, typename CHAR>
174 InternalListIoStatementState<DIR, CHAR>::InternalListIoStatementState(
175     Buffer buffer, std::size_t length, const char *sourceFile, int sourceLine)
176     : InternalIoStatementState<DIR, CharType>{buffer, length, sourceFile,
177           sourceLine},
178       ioStatementState_{*this} {}
179 
180 template <Direction DIR, typename CHAR>
181 InternalListIoStatementState<DIR, CHAR>::InternalListIoStatementState(
182     const Descriptor &d, const char *sourceFile, int sourceLine)
183     : InternalIoStatementState<DIR, CharType>{d, sourceFile, sourceLine},
184       ioStatementState_{*this} {}
185 
186 ExternalIoStatementBase::ExternalIoStatementBase(
187     ExternalFileUnit &unit, const char *sourceFile, int sourceLine)
188     : IoStatementBase{sourceFile, sourceLine}, unit_{unit} {}
189 
190 MutableModes &ExternalIoStatementBase::mutableModes() { return unit_.modes; }
191 
192 ConnectionState &ExternalIoStatementBase::GetConnectionState() { return unit_; }
193 
194 int ExternalIoStatementBase::EndIoStatement() {
195   if (mutableModes().nonAdvancing) {
196     unit_.leftTabLimit = unit_.furthestPositionInRecord;
197   } else {
198     unit_.leftTabLimit.reset();
199   }
200   auto result{IoStatementBase::EndIoStatement()};
201   unit_.EndIoStatement(); // annihilates *this in unit_.u_
202   return result;
203 }
204 
205 void OpenStatementState::set_path(const char *path, std::size_t length) {
206   pathLength_ = TrimTrailingSpaces(path, length);
207   path_ = SaveDefaultCharacter(path, pathLength_, *this);
208 }
209 
210 int OpenStatementState::EndIoStatement() {
211   if (position_) {
212     if (access_ && *access_ == Access::Direct) {
213       SignalError("POSITION= may not be set with ACCESS='DIRECT'");
214       position_.reset();
215     }
216   }
217   if (path_.get() || wasExtant_ ||
218       (status_ && *status_ == OpenStatus::Scratch)) {
219     unit().OpenUnit(status_, action_, position_.value_or(Position::AsIs),
220         std::move(path_), pathLength_, convert_, *this);
221   } else {
222     unit().OpenAnonymousUnit(
223         status_, action_, position_.value_or(Position::AsIs), convert_, *this);
224   }
225   if (access_) {
226     if (*access_ != unit().access) {
227       if (wasExtant_) {
228         SignalError("ACCESS= may not be changed on an open unit");
229         access_.reset();
230       }
231     }
232     if (access_) {
233       unit().access = *access_;
234     }
235   }
236   if (!unit().isUnformatted) {
237     unit().isUnformatted = isUnformatted_;
238   }
239   if (isUnformatted_ && *isUnformatted_ != *unit().isUnformatted) {
240     if (wasExtant_) {
241       SignalError("FORM= may not be changed on an open unit");
242     }
243     unit().isUnformatted = *isUnformatted_;
244   }
245   if (!unit().isUnformatted) {
246     // Set default format (C.7.4 point 2).
247     unit().isUnformatted = unit().access != Access::Sequential;
248   }
249   return ExternalIoStatementBase::EndIoStatement();
250 }
251 
252 int CloseStatementState::EndIoStatement() {
253   int result{ExternalIoStatementBase::EndIoStatement()};
254   unit().CloseUnit(status_, *this);
255   unit().DestroyClosed();
256   return result;
257 }
258 
259 int NoUnitIoStatementState::EndIoStatement() {
260   auto result{IoStatementBase::EndIoStatement()};
261   FreeMemory(this);
262   return result;
263 }
264 
265 template <Direction DIR>
266 ExternalIoStatementState<DIR>::ExternalIoStatementState(
267     ExternalFileUnit &unit, const char *sourceFile, int sourceLine)
268     : ExternalIoStatementBase{unit, sourceFile, sourceLine}, mutableModes_{
269                                                                  unit.modes} {
270   if constexpr (DIR == Direction::Output) {
271     // If the last statement was a non-advancing IO input statement, the unit
272     // furthestPositionInRecord was not advanced, but the positionInRecord may
273     // have been advanced. Advance furthestPositionInRecord here to avoid
274     // overwriting the part of the record that has been read with blanks.
275     unit.furthestPositionInRecord =
276         std::max(unit.furthestPositionInRecord, unit.positionInRecord);
277   }
278 }
279 
280 template <Direction DIR> int ExternalIoStatementState<DIR>::EndIoStatement() {
281   if constexpr (DIR == Direction::Input) {
282     BeginReadingRecord(); // in case there were no I/O items
283     if (!mutableModes().nonAdvancing || GetIoStat() == IostatEor) {
284       FinishReadingRecord();
285     }
286   } else {
287     if (!mutableModes().nonAdvancing) {
288       unit().AdvanceRecord(*this);
289     }
290     unit().FlushIfTerminal(*this);
291   }
292   return ExternalIoStatementBase::EndIoStatement();
293 }
294 
295 template <Direction DIR>
296 bool ExternalIoStatementState<DIR>::Emit(
297     const char *data, std::size_t bytes, std::size_t elementBytes) {
298   if constexpr (DIR == Direction::Input) {
299     Crash("ExternalIoStatementState::Emit(char) called for input statement");
300   }
301   return unit().Emit(data, bytes, elementBytes, *this);
302 }
303 
304 template <Direction DIR>
305 bool ExternalIoStatementState<DIR>::Emit(const char *data, std::size_t bytes) {
306   if constexpr (DIR == Direction::Input) {
307     Crash("ExternalIoStatementState::Emit(char) called for input statement");
308   }
309   return unit().Emit(data, bytes, 0, *this);
310 }
311 
312 template <Direction DIR>
313 bool ExternalIoStatementState<DIR>::Emit(
314     const char16_t *data, std::size_t chars) {
315   if constexpr (DIR == Direction::Input) {
316     Crash(
317         "ExternalIoStatementState::Emit(char16_t) called for input statement");
318   }
319   // TODO: UTF-8 encoding
320   return unit().Emit(reinterpret_cast<const char *>(data), chars * sizeof *data,
321       sizeof *data, *this);
322 }
323 
324 template <Direction DIR>
325 bool ExternalIoStatementState<DIR>::Emit(
326     const char32_t *data, std::size_t chars) {
327   if constexpr (DIR == Direction::Input) {
328     Crash(
329         "ExternalIoStatementState::Emit(char32_t) called for input statement");
330   }
331   // TODO: UTF-8 encoding
332   return unit().Emit(reinterpret_cast<const char *>(data), chars * sizeof *data,
333       sizeof *data, *this);
334 }
335 
336 template <Direction DIR>
337 std::size_t ExternalIoStatementState<DIR>::GetNextInputBytes(const char *&p) {
338   return unit().GetNextInputBytes(p, *this);
339 }
340 
341 template <Direction DIR>
342 bool ExternalIoStatementState<DIR>::AdvanceRecord(int n) {
343   while (n-- > 0) {
344     if (!unit().AdvanceRecord(*this)) {
345       return false;
346     }
347   }
348   return true;
349 }
350 
351 template <Direction DIR> void ExternalIoStatementState<DIR>::BackspaceRecord() {
352   unit().BackspaceRecord(*this);
353 }
354 
355 template <Direction DIR>
356 void ExternalIoStatementState<DIR>::HandleAbsolutePosition(std::int64_t n) {
357   return unit().HandleAbsolutePosition(n);
358 }
359 
360 template <Direction DIR>
361 void ExternalIoStatementState<DIR>::HandleRelativePosition(std::int64_t n) {
362   return unit().HandleRelativePosition(n);
363 }
364 
365 template <Direction DIR>
366 bool ExternalIoStatementState<DIR>::BeginReadingRecord() {
367   if constexpr (DIR == Direction::Input) {
368     return unit().BeginReadingRecord(*this);
369   } else {
370     Crash("ExternalIoStatementState<Direction::Output>::BeginReadingRecord() "
371           "called");
372     return false;
373   }
374 }
375 
376 template <Direction DIR>
377 void ExternalIoStatementState<DIR>::FinishReadingRecord() {
378   if constexpr (DIR == Direction::Input) {
379     unit().FinishReadingRecord(*this);
380   } else {
381     Crash("ExternalIoStatementState<Direction::Output>::FinishReadingRecord() "
382           "called");
383   }
384 }
385 
386 template <Direction DIR, typename CHAR>
387 ExternalFormattedIoStatementState<DIR, CHAR>::ExternalFormattedIoStatementState(
388     ExternalFileUnit &unit, const CHAR *format, std::size_t formatLength,
389     const char *sourceFile, int sourceLine)
390     : ExternalIoStatementState<DIR>{unit, sourceFile, sourceLine},
391       format_{*this, format, formatLength} {}
392 
393 template <Direction DIR, typename CHAR>
394 int ExternalFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
395   if constexpr (DIR == Direction::Input) {
396     this->BeginReadingRecord(); // in case there were no I/O items
397   }
398   format_.Finish(*this);
399   return ExternalIoStatementState<DIR>::EndIoStatement();
400 }
401 
402 std::optional<DataEdit> IoStatementState::GetNextDataEdit(int n) {
403   return std::visit(
404       [&](auto &x) { return x.get().GetNextDataEdit(*this, n); }, u_);
405 }
406 
407 bool IoStatementState::Emit(
408     const char *data, std::size_t n, std::size_t elementBytes) {
409   return std::visit(
410       [=](auto &x) { return x.get().Emit(data, n, elementBytes); }, u_);
411 }
412 
413 bool IoStatementState::Emit(const char *data, std::size_t n) {
414   return std::visit([=](auto &x) { return x.get().Emit(data, n); }, u_);
415 }
416 
417 bool IoStatementState::Emit(const char16_t *data, std::size_t chars) {
418   return std::visit([=](auto &x) { return x.get().Emit(data, chars); }, u_);
419 }
420 
421 bool IoStatementState::Emit(const char32_t *data, std::size_t chars) {
422   return std::visit([=](auto &x) { return x.get().Emit(data, chars); }, u_);
423 }
424 
425 bool IoStatementState::Receive(
426     char *data, std::size_t n, std::size_t elementBytes) {
427   return std::visit(
428       [=](auto &x) { return x.get().Receive(data, n, elementBytes); }, u_);
429 }
430 
431 std::size_t IoStatementState::GetNextInputBytes(const char *&p) {
432   return std::visit([&](auto &x) { return x.get().GetNextInputBytes(p); }, u_);
433 }
434 
435 bool IoStatementState::AdvanceRecord(int n) {
436   return std::visit([=](auto &x) { return x.get().AdvanceRecord(n); }, u_);
437 }
438 
439 void IoStatementState::BackspaceRecord() {
440   std::visit([](auto &x) { x.get().BackspaceRecord(); }, u_);
441 }
442 
443 void IoStatementState::HandleRelativePosition(std::int64_t n) {
444   std::visit([=](auto &x) { x.get().HandleRelativePosition(n); }, u_);
445 }
446 
447 void IoStatementState::HandleAbsolutePosition(std::int64_t n) {
448   std::visit([=](auto &x) { x.get().HandleAbsolutePosition(n); }, u_);
449 }
450 
451 int IoStatementState::EndIoStatement() {
452   return std::visit([](auto &x) { return x.get().EndIoStatement(); }, u_);
453 }
454 
455 ConnectionState &IoStatementState::GetConnectionState() {
456   return std::visit(
457       [](auto &x) -> ConnectionState & { return x.get().GetConnectionState(); },
458       u_);
459 }
460 
461 MutableModes &IoStatementState::mutableModes() {
462   return std::visit(
463       [](auto &x) -> MutableModes & { return x.get().mutableModes(); }, u_);
464 }
465 
466 bool IoStatementState::BeginReadingRecord() {
467   return std::visit([](auto &x) { return x.get().BeginReadingRecord(); }, u_);
468 }
469 
470 IoErrorHandler &IoStatementState::GetIoErrorHandler() const {
471   return std::visit(
472       [](auto &x) -> IoErrorHandler & {
473         return static_cast<IoErrorHandler &>(x.get());
474       },
475       u_);
476 }
477 
478 ExternalFileUnit *IoStatementState::GetExternalFileUnit() const {
479   return std::visit([](auto &x) { return x.get().GetExternalFileUnit(); }, u_);
480 }
481 
482 bool IoStatementState::EmitRepeated(char ch, std::size_t n) {
483   return std::visit(
484       [=](auto &x) {
485         for (std::size_t j{0}; j < n; ++j) {
486           if (!x.get().Emit(&ch, 1)) {
487             return false;
488           }
489         }
490         return true;
491       },
492       u_);
493 }
494 
495 bool IoStatementState::EmitField(
496     const char *p, std::size_t length, std::size_t width) {
497   if (width <= 0) {
498     width = static_cast<int>(length);
499   }
500   if (length > static_cast<std::size_t>(width)) {
501     return EmitRepeated('*', width);
502   } else {
503     return EmitRepeated(' ', static_cast<int>(width - length)) &&
504         Emit(p, length);
505   }
506 }
507 
508 std::optional<char32_t> IoStatementState::NextInField(
509     std::optional<int> &remaining, const DataEdit &edit) {
510   if (!remaining) { // Stream, list-directed, or NAMELIST
511     if (auto next{GetCurrentChar()}) {
512       if (edit.IsListDirected()) {
513         // list-directed or NAMELIST: check for separators
514         switch (*next) {
515         case ' ':
516         case '\t':
517         case ';':
518         case '/':
519         case '(':
520         case ')':
521         case '\'':
522         case '"':
523         case '*':
524         case '\n': // for stream access
525           return std::nullopt;
526         case ',':
527           if (edit.modes.editingFlags & decimalComma) {
528             break;
529           } else {
530             return std::nullopt;
531           }
532         default:
533           break;
534         }
535       }
536       HandleRelativePosition(1);
537       GotChar();
538       return next;
539     }
540   } else if (*remaining > 0) {
541     if (auto next{GetCurrentChar()}) {
542       --*remaining;
543       HandleRelativePosition(1);
544       GotChar();
545       return next;
546     }
547     const ConnectionState &connection{GetConnectionState()};
548     if (!connection.IsAtEOF()) {
549       if (auto length{connection.EffectiveRecordLength()}) {
550         if (connection.positionInRecord >= *length) {
551           IoErrorHandler &handler{GetIoErrorHandler()};
552           if (mutableModes().nonAdvancing) {
553             handler.SignalEor();
554           } else if (connection.openRecl && !connection.modes.pad) {
555             handler.SignalError(IostatRecordReadOverrun);
556           }
557           if (connection.modes.pad) { // PAD='YES'
558             --*remaining;
559             return std::optional<char32_t>{' '};
560           }
561         }
562       }
563     }
564   }
565   return std::nullopt;
566 }
567 
568 bool IoStatementState::Inquire(
569     InquiryKeywordHash inquiry, char *out, std::size_t chars) {
570   return std::visit(
571       [&](auto &x) { return x.get().Inquire(inquiry, out, chars); }, u_);
572 }
573 
574 bool IoStatementState::Inquire(InquiryKeywordHash inquiry, bool &out) {
575   return std::visit([&](auto &x) { return x.get().Inquire(inquiry, out); }, u_);
576 }
577 
578 bool IoStatementState::Inquire(
579     InquiryKeywordHash inquiry, std::int64_t id, bool &out) {
580   return std::visit(
581       [&](auto &x) { return x.get().Inquire(inquiry, id, out); }, u_);
582 }
583 
584 bool IoStatementState::Inquire(InquiryKeywordHash inquiry, std::int64_t &n) {
585   return std::visit([&](auto &x) { return x.get().Inquire(inquiry, n); }, u_);
586 }
587 
588 void IoStatementState::GotChar(int n) {
589   if (auto *formattedIn{
590           get_if<FormattedIoStatementState<Direction::Input>>()}) {
591     formattedIn->GotChar(n);
592   } else {
593     GetIoErrorHandler().Crash("IoStatementState::GotChar() called for "
594                               "statement that is not formatted input");
595   }
596 }
597 
598 std::size_t
599 FormattedIoStatementState<Direction::Input>::GetEditDescriptorChars() const {
600   return chars_;
601 }
602 
603 void FormattedIoStatementState<Direction::Input>::GotChar(int n) {
604   chars_ += n;
605 }
606 
607 bool ListDirectedStatementState<Direction::Output>::EmitLeadingSpaceOrAdvance(
608     IoStatementState &io, std::size_t length, bool isCharacter) {
609   if (length == 0) {
610     return true;
611   }
612   const ConnectionState &connection{io.GetConnectionState()};
613   int space{connection.positionInRecord == 0 ||
614       !(isCharacter && lastWasUndelimitedCharacter())};
615   set_lastWasUndelimitedCharacter(false);
616   if (connection.NeedAdvance(space + length)) {
617     return io.AdvanceRecord();
618   }
619   if (space) {
620     return io.Emit(" ", 1);
621   }
622   return true;
623 }
624 
625 std::optional<DataEdit>
626 ListDirectedStatementState<Direction::Output>::GetNextDataEdit(
627     IoStatementState &io, int maxRepeat) {
628   DataEdit edit;
629   edit.descriptor = DataEdit::ListDirected;
630   edit.repeat = maxRepeat;
631   edit.modes = io.mutableModes();
632   return edit;
633 }
634 
635 std::optional<DataEdit>
636 ListDirectedStatementState<Direction::Input>::GetNextDataEdit(
637     IoStatementState &io, int maxRepeat) {
638   // N.B. list-directed transfers cannot be nonadvancing (C1221)
639   ConnectionState &connection{io.GetConnectionState()};
640   DataEdit edit;
641   edit.descriptor = DataEdit::ListDirected;
642   edit.repeat = 1; // may be overridden below
643   edit.modes = io.mutableModes();
644   if (hitSlash_) { // everything after '/' is nullified
645     edit.descriptor = DataEdit::ListDirectedNullValue;
646     return edit;
647   }
648   char32_t comma{','};
649   if (edit.modes.editingFlags & decimalComma) {
650     comma = ';';
651   }
652   if (remaining_ > 0 && !realPart_) { // "r*c" repetition in progress
653     RUNTIME_CHECK(io.GetIoErrorHandler(), repeatPosition_.has_value());
654     repeatPosition_.reset(); // restores the saved position
655     if (!imaginaryPart_) {
656       edit.repeat = std::min<int>(remaining_, maxRepeat);
657       auto ch{io.GetCurrentChar()};
658       if (!ch || *ch == ' ' || *ch == '\t' || *ch == comma) {
659         // "r*" repeated null
660         edit.descriptor = DataEdit::ListDirectedNullValue;
661       }
662     }
663     remaining_ -= edit.repeat;
664     if (remaining_ > 0) {
665       repeatPosition_.emplace(io);
666     }
667     return edit;
668   }
669   // Skip separators, handle a "r*c" repeat count; see 13.10.2 in Fortran 2018
670   if (imaginaryPart_) {
671     imaginaryPart_ = false;
672   } else if (realPart_) {
673     realPart_ = false;
674     imaginaryPart_ = true;
675     edit.descriptor = DataEdit::ListDirectedImaginaryPart;
676   }
677   auto ch{io.GetNextNonBlank()};
678   if (ch && *ch == comma && eatComma_) {
679     // Consume comma & whitespace after previous item.
680     // This includes the comma between real and imaginary components
681     // in list-directed/NAMELIST complex input.
682     // (When DECIMAL='COMMA', the comma is actually a semicolon.)
683     io.HandleRelativePosition(1);
684     ch = io.GetNextNonBlank();
685   }
686   eatComma_ = true;
687   if (!ch) {
688     return std::nullopt;
689   }
690   if (*ch == '/') {
691     hitSlash_ = true;
692     edit.descriptor = DataEdit::ListDirectedNullValue;
693     return edit;
694   }
695   if (*ch == comma) { // separator: null value
696     edit.descriptor = DataEdit::ListDirectedNullValue;
697     return edit;
698   }
699   if (imaginaryPart_) { // can't repeat components
700     return edit;
701   }
702   if (*ch >= '0' && *ch <= '9') { // look for "r*" repetition count
703     auto start{connection.positionInRecord};
704     int r{0};
705     do {
706       static auto constexpr clamp{(std::numeric_limits<int>::max() - '9') / 10};
707       if (r >= clamp) {
708         r = 0;
709         break;
710       }
711       r = 10 * r + (*ch - '0');
712       io.HandleRelativePosition(1);
713       ch = io.GetCurrentChar();
714     } while (ch && *ch >= '0' && *ch <= '9');
715     if (r > 0 && ch && *ch == '*') { // subtle: r must be nonzero
716       io.HandleRelativePosition(1);
717       ch = io.GetCurrentChar();
718       if (ch && *ch == '/') { // r*/
719         hitSlash_ = true;
720         edit.descriptor = DataEdit::ListDirectedNullValue;
721         return edit;
722       }
723       if (!ch || *ch == ' ' || *ch == '\t' || *ch == comma) { // "r*" null
724         edit.descriptor = DataEdit::ListDirectedNullValue;
725       }
726       edit.repeat = std::min<int>(r, maxRepeat);
727       remaining_ = r - edit.repeat;
728       if (remaining_ > 0) {
729         repeatPosition_.emplace(io);
730       }
731     } else { // not a repetition count, just an integer value; rewind
732       connection.positionInRecord = start;
733     }
734   }
735   if (!imaginaryPart_ && ch && *ch == '(') {
736     realPart_ = true;
737     io.HandleRelativePosition(1);
738     edit.descriptor = DataEdit::ListDirectedRealPart;
739   }
740   return edit;
741 }
742 
743 template <Direction DIR>
744 bool ExternalUnformattedIoStatementState<DIR>::Receive(
745     char *data, std::size_t bytes, std::size_t elementBytes) {
746   if constexpr (DIR == Direction::Output) {
747     this->Crash("ExternalUnformattedIoStatementState::Receive() called for "
748                 "output statement");
749   }
750   return this->unit().Receive(data, bytes, elementBytes, *this);
751 }
752 
753 template <Direction DIR>
754 ChildIoStatementState<DIR>::ChildIoStatementState(
755     ChildIo &child, const char *sourceFile, int sourceLine)
756     : IoStatementBase{sourceFile, sourceLine}, child_{child} {}
757 
758 template <Direction DIR>
759 MutableModes &ChildIoStatementState<DIR>::mutableModes() {
760   return child_.parent().mutableModes();
761 }
762 
763 template <Direction DIR>
764 ConnectionState &ChildIoStatementState<DIR>::GetConnectionState() {
765   return child_.parent().GetConnectionState();
766 }
767 
768 template <Direction DIR>
769 ExternalFileUnit *ChildIoStatementState<DIR>::GetExternalFileUnit() const {
770   return child_.parent().GetExternalFileUnit();
771 }
772 
773 template <Direction DIR> int ChildIoStatementState<DIR>::EndIoStatement() {
774   auto result{IoStatementBase::EndIoStatement()};
775   child_.EndIoStatement(); // annihilates *this in child_.u_
776   return result;
777 }
778 
779 template <Direction DIR>
780 bool ChildIoStatementState<DIR>::Emit(
781     const char *data, std::size_t bytes, std::size_t elementBytes) {
782   return child_.parent().Emit(data, bytes, elementBytes);
783 }
784 
785 template <Direction DIR>
786 bool ChildIoStatementState<DIR>::Emit(const char *data, std::size_t bytes) {
787   return child_.parent().Emit(data, bytes);
788 }
789 
790 template <Direction DIR>
791 bool ChildIoStatementState<DIR>::Emit(const char16_t *data, std::size_t chars) {
792   return child_.parent().Emit(data, chars);
793 }
794 
795 template <Direction DIR>
796 bool ChildIoStatementState<DIR>::Emit(const char32_t *data, std::size_t chars) {
797   return child_.parent().Emit(data, chars);
798 }
799 
800 template <Direction DIR>
801 std::size_t ChildIoStatementState<DIR>::GetNextInputBytes(const char *&p) {
802   return child_.parent().GetNextInputBytes(p);
803 }
804 
805 template <Direction DIR>
806 void ChildIoStatementState<DIR>::HandleAbsolutePosition(std::int64_t n) {
807   return child_.parent().HandleAbsolutePosition(n);
808 }
809 
810 template <Direction DIR>
811 void ChildIoStatementState<DIR>::HandleRelativePosition(std::int64_t n) {
812   return child_.parent().HandleRelativePosition(n);
813 }
814 
815 template <Direction DIR, typename CHAR>
816 ChildFormattedIoStatementState<DIR, CHAR>::ChildFormattedIoStatementState(
817     ChildIo &child, const CHAR *format, std::size_t formatLength,
818     const char *sourceFile, int sourceLine)
819     : ChildIoStatementState<DIR>{child, sourceFile, sourceLine},
820       mutableModes_{child.parent().mutableModes()}, format_{*this, format,
821                                                         formatLength} {}
822 
823 template <Direction DIR, typename CHAR>
824 int ChildFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
825   format_.Finish(*this);
826   return ChildIoStatementState<DIR>::EndIoStatement();
827 }
828 
829 template <Direction DIR, typename CHAR>
830 bool ChildFormattedIoStatementState<DIR, CHAR>::AdvanceRecord(int) {
831   return false; // no can do in a child I/O
832 }
833 
834 template <Direction DIR>
835 bool ChildUnformattedIoStatementState<DIR>::Receive(
836     char *data, std::size_t bytes, std::size_t elementBytes) {
837   return this->child().parent().Receive(data, bytes, elementBytes);
838 }
839 
840 template class InternalIoStatementState<Direction::Output>;
841 template class InternalIoStatementState<Direction::Input>;
842 template class InternalFormattedIoStatementState<Direction::Output>;
843 template class InternalFormattedIoStatementState<Direction::Input>;
844 template class InternalListIoStatementState<Direction::Output>;
845 template class InternalListIoStatementState<Direction::Input>;
846 template class ExternalIoStatementState<Direction::Output>;
847 template class ExternalIoStatementState<Direction::Input>;
848 template class ExternalFormattedIoStatementState<Direction::Output>;
849 template class ExternalFormattedIoStatementState<Direction::Input>;
850 template class ExternalListIoStatementState<Direction::Output>;
851 template class ExternalListIoStatementState<Direction::Input>;
852 template class ExternalUnformattedIoStatementState<Direction::Output>;
853 template class ExternalUnformattedIoStatementState<Direction::Input>;
854 template class ChildIoStatementState<Direction::Output>;
855 template class ChildIoStatementState<Direction::Input>;
856 template class ChildFormattedIoStatementState<Direction::Output>;
857 template class ChildFormattedIoStatementState<Direction::Input>;
858 template class ChildListIoStatementState<Direction::Output>;
859 template class ChildListIoStatementState<Direction::Input>;
860 template class ChildUnformattedIoStatementState<Direction::Output>;
861 template class ChildUnformattedIoStatementState<Direction::Input>;
862 
863 int ExternalMiscIoStatementState::EndIoStatement() {
864   ExternalFileUnit &ext{unit()};
865   switch (which_) {
866   case Flush:
867     ext.FlushOutput(*this);
868     std::fflush(nullptr); // flushes C stdio output streams (12.9(2))
869     break;
870   case Backspace:
871     ext.BackspaceRecord(*this);
872     break;
873   case Endfile:
874     ext.Endfile(*this);
875     break;
876   case Rewind:
877     ext.Rewind(*this);
878     break;
879   }
880   return ExternalIoStatementBase::EndIoStatement();
881 }
882 
883 InquireUnitState::InquireUnitState(
884     ExternalFileUnit &unit, const char *sourceFile, int sourceLine)
885     : ExternalIoStatementBase{unit, sourceFile, sourceLine} {}
886 
887 bool InquireUnitState::Inquire(
888     InquiryKeywordHash inquiry, char *result, std::size_t length) {
889   if (unit().createdForInternalChildIo()) {
890     SignalError(IostatInquireInternalUnit,
891         "INQUIRE of unit created for defined derived type I/O of an internal "
892         "unit");
893     return false;
894   }
895   const char *str{nullptr};
896   switch (inquiry) {
897   case HashInquiryKeyword("ACCESS"):
898     if (!unit().IsConnected()) {
899       str = "UNDEFINED";
900     } else {
901       switch (unit().access) {
902       case Access::Sequential:
903         str = "SEQUENTIAL";
904         break;
905       case Access::Direct:
906         str = "DIRECT";
907         break;
908       case Access::Stream:
909         str = "STREAM";
910         break;
911       }
912     }
913     break;
914   case HashInquiryKeyword("ACTION"):
915     str = !unit().IsConnected() ? "UNDEFINED"
916         : unit().mayWrite()     ? unit().mayRead() ? "READWRITE" : "WRITE"
917                                 : "READ";
918     break;
919   case HashInquiryKeyword("ASYNCHRONOUS"):
920     str = !unit().IsConnected()    ? "UNDEFINED"
921         : unit().mayAsynchronous() ? "YES"
922                                    : "NO";
923     break;
924   case HashInquiryKeyword("BLANK"):
925     str = !unit().IsConnected() || unit().isUnformatted.value_or(true)
926         ? "UNDEFINED"
927         : unit().modes.editingFlags & blankZero ? "ZERO"
928                                                 : "NULL";
929     break;
930   case HashInquiryKeyword("CARRIAGECONTROL"):
931     str = "LIST";
932     break;
933   case HashInquiryKeyword("CONVERT"):
934     str = unit().swapEndianness() ? "SWAP" : "NATIVE";
935     break;
936   case HashInquiryKeyword("DECIMAL"):
937     str = !unit().IsConnected() || unit().isUnformatted.value_or(true)
938         ? "UNDEFINED"
939         : unit().modes.editingFlags & decimalComma ? "COMMA"
940                                                    : "POINT";
941     break;
942   case HashInquiryKeyword("DELIM"):
943     if (!unit().IsConnected() || unit().isUnformatted.value_or(true)) {
944       str = "UNDEFINED";
945     } else {
946       switch (unit().modes.delim) {
947       case '\'':
948         str = "APOSTROPHE";
949         break;
950       case '"':
951         str = "QUOTE";
952         break;
953       default:
954         str = "NONE";
955         break;
956       }
957     }
958     break;
959   case HashInquiryKeyword("DIRECT"):
960     str = !unit().IsConnected() ? "UNKNOWN"
961         : unit().access == Access::Direct ||
962             (unit().mayPosition() && unit().openRecl)
963         ? "YES"
964         : "NO";
965     break;
966   case HashInquiryKeyword("ENCODING"):
967     str = !unit().IsConnected()               ? "UNKNOWN"
968         : unit().isUnformatted.value_or(true) ? "UNDEFINED"
969         : unit().isUTF8                       ? "UTF-8"
970                                               : "ASCII";
971     break;
972   case HashInquiryKeyword("FORM"):
973     str = !unit().IsConnected() || !unit().isUnformatted ? "UNDEFINED"
974         : *unit().isUnformatted                          ? "UNFORMATTED"
975                                                          : "FORMATTED";
976     break;
977   case HashInquiryKeyword("FORMATTED"):
978     str = !unit().IsConnected() ? "UNDEFINED"
979         : !unit().isUnformatted ? "UNKNOWN"
980         : *unit().isUnformatted ? "NO"
981                                 : "YES";
982     break;
983   case HashInquiryKeyword("NAME"):
984     str = unit().path();
985     if (!str) {
986       return true; // result is undefined
987     }
988     break;
989   case HashInquiryKeyword("PAD"):
990     str = !unit().IsConnected() || unit().isUnformatted.value_or(true)
991         ? "UNDEFINED"
992         : unit().modes.pad ? "YES"
993                            : "NO";
994     break;
995   case HashInquiryKeyword("POSITION"):
996     if (!unit().IsConnected() || unit().access == Access::Direct) {
997       str = "UNDEFINED";
998     } else {
999       switch (unit().InquirePosition()) {
1000       case Position::Rewind:
1001         str = "REWIND";
1002         break;
1003       case Position::Append:
1004         str = "APPEND";
1005         break;
1006       case Position::AsIs:
1007         str = "ASIS";
1008         break;
1009       }
1010     }
1011     break;
1012   case HashInquiryKeyword("READ"):
1013     str = !unit().IsConnected() ? "UNDEFINED" : unit().mayRead() ? "YES" : "NO";
1014     break;
1015   case HashInquiryKeyword("READWRITE"):
1016     str = !unit().IsConnected()                 ? "UNDEFINED"
1017         : unit().mayRead() && unit().mayWrite() ? "YES"
1018                                                 : "NO";
1019     break;
1020   case HashInquiryKeyword("ROUND"):
1021     if (!unit().IsConnected() || unit().isUnformatted.value_or(true)) {
1022       str = "UNDEFINED";
1023     } else {
1024       switch (unit().modes.round) {
1025       case decimal::FortranRounding::RoundNearest:
1026         str = "NEAREST";
1027         break;
1028       case decimal::FortranRounding::RoundUp:
1029         str = "UP";
1030         break;
1031       case decimal::FortranRounding::RoundDown:
1032         str = "DOWN";
1033         break;
1034       case decimal::FortranRounding::RoundToZero:
1035         str = "ZERO";
1036         break;
1037       case decimal::FortranRounding::RoundCompatible:
1038         str = "COMPATIBLE";
1039         break;
1040       }
1041     }
1042     break;
1043   case HashInquiryKeyword("SEQUENTIAL"):
1044     // "NO" for Direct, since Sequential would not work if
1045     // the unit were reopened without RECL=.
1046     str = !unit().IsConnected()               ? "UNKNOWN"
1047         : unit().access == Access::Sequential ? "YES"
1048                                               : "NO";
1049     break;
1050   case HashInquiryKeyword("SIGN"):
1051     str = !unit().IsConnected() || unit().isUnformatted.value_or(true)
1052         ? "UNDEFINED"
1053         : unit().modes.editingFlags & signPlus ? "PLUS"
1054                                                : "SUPPRESS";
1055     break;
1056   case HashInquiryKeyword("STREAM"):
1057     str = !unit().IsConnected()           ? "UNKNOWN"
1058         : unit().access == Access::Stream ? "YES"
1059                                           : "NO";
1060     break;
1061   case HashInquiryKeyword("UNFORMATTED"):
1062     str = !unit().IsConnected() || !unit().isUnformatted ? "UNKNOWN"
1063         : *unit().isUnformatted                          ? "YES"
1064                                                          : "NO";
1065     break;
1066   case HashInquiryKeyword("WRITE"):
1067     str = !unit().IsConnected() ? "UNKNOWN" : unit().mayWrite() ? "YES" : "NO";
1068     break;
1069   }
1070   if (str) {
1071     ToFortranDefaultCharacter(result, length, str);
1072     return true;
1073   } else {
1074     BadInquiryKeywordHashCrash(inquiry);
1075     return false;
1076   }
1077 }
1078 
1079 bool InquireUnitState::Inquire(InquiryKeywordHash inquiry, bool &result) {
1080   switch (inquiry) {
1081   case HashInquiryKeyword("EXIST"):
1082     result = true;
1083     return true;
1084   case HashInquiryKeyword("NAMED"):
1085     result = unit().path() != nullptr;
1086     return true;
1087   case HashInquiryKeyword("OPENED"):
1088     result = unit().IsConnected();
1089     return true;
1090   case HashInquiryKeyword("PENDING"):
1091     result = false; // asynchronous I/O is not implemented
1092     return true;
1093   default:
1094     BadInquiryKeywordHashCrash(inquiry);
1095     return false;
1096   }
1097 }
1098 
1099 bool InquireUnitState::Inquire(
1100     InquiryKeywordHash inquiry, std::int64_t, bool &result) {
1101   switch (inquiry) {
1102   case HashInquiryKeyword("PENDING"):
1103     result = false; // asynchronous I/O is not implemented
1104     return true;
1105   default:
1106     BadInquiryKeywordHashCrash(inquiry);
1107     return false;
1108   }
1109 }
1110 
1111 bool InquireUnitState::Inquire(
1112     InquiryKeywordHash inquiry, std::int64_t &result) {
1113   switch (inquiry) {
1114   case HashInquiryKeyword("NEXTREC"):
1115     if (unit().access == Access::Direct) {
1116       result = unit().currentRecordNumber;
1117     }
1118     return true;
1119   case HashInquiryKeyword("NUMBER"):
1120     result = unit().IsConnected() ? unit().unitNumber() : -1;
1121     return true;
1122   case HashInquiryKeyword("POS"):
1123     result = unit().InquirePos();
1124     return true;
1125   case HashInquiryKeyword("RECL"):
1126     if (!unit().IsConnected()) {
1127       result = -1;
1128     } else if (unit().access == Access::Stream) {
1129       result = -2;
1130     } else if (unit().openRecl) {
1131       result = *unit().openRecl;
1132     } else {
1133       result = std::numeric_limits<std::int32_t>::max();
1134     }
1135     return true;
1136   case HashInquiryKeyword("SIZE"):
1137     result = -1;
1138     if (unit().IsConnected()) {
1139       if (auto size{unit().knownSize()}) {
1140         result = *size;
1141       }
1142     }
1143     return true;
1144   default:
1145     BadInquiryKeywordHashCrash(inquiry);
1146     return false;
1147   }
1148 }
1149 
1150 InquireNoUnitState::InquireNoUnitState(const char *sourceFile, int sourceLine)
1151     : NoUnitIoStatementState{sourceFile, sourceLine, *this} {}
1152 
1153 bool InquireNoUnitState::Inquire(
1154     InquiryKeywordHash inquiry, char *result, std::size_t length) {
1155   switch (inquiry) {
1156   case HashInquiryKeyword("ACCESS"):
1157   case HashInquiryKeyword("ACTION"):
1158   case HashInquiryKeyword("ASYNCHRONOUS"):
1159   case HashInquiryKeyword("BLANK"):
1160   case HashInquiryKeyword("CARRIAGECONTROL"):
1161   case HashInquiryKeyword("CONVERT"):
1162   case HashInquiryKeyword("DECIMAL"):
1163   case HashInquiryKeyword("DELIM"):
1164   case HashInquiryKeyword("FORM"):
1165   case HashInquiryKeyword("NAME"):
1166   case HashInquiryKeyword("PAD"):
1167   case HashInquiryKeyword("POSITION"):
1168   case HashInquiryKeyword("ROUND"):
1169   case HashInquiryKeyword("SIGN"):
1170     ToFortranDefaultCharacter(result, length, "UNDEFINED");
1171     return true;
1172   case HashInquiryKeyword("DIRECT"):
1173   case HashInquiryKeyword("ENCODING"):
1174   case HashInquiryKeyword("FORMATTED"):
1175   case HashInquiryKeyword("READ"):
1176   case HashInquiryKeyword("READWRITE"):
1177   case HashInquiryKeyword("SEQUENTIAL"):
1178   case HashInquiryKeyword("STREAM"):
1179   case HashInquiryKeyword("WRITE"):
1180   case HashInquiryKeyword("UNFORMATTED"):
1181     ToFortranDefaultCharacter(result, length, "UNKNONN");
1182     return true;
1183   default:
1184     BadInquiryKeywordHashCrash(inquiry);
1185     return false;
1186   }
1187 }
1188 
1189 bool InquireNoUnitState::Inquire(InquiryKeywordHash inquiry, bool &result) {
1190   switch (inquiry) {
1191   case HashInquiryKeyword("EXIST"):
1192     result = true;
1193     return true;
1194   case HashInquiryKeyword("NAMED"):
1195   case HashInquiryKeyword("OPENED"):
1196   case HashInquiryKeyword("PENDING"):
1197     result = false;
1198     return true;
1199   default:
1200     BadInquiryKeywordHashCrash(inquiry);
1201     return false;
1202   }
1203 }
1204 
1205 bool InquireNoUnitState::Inquire(
1206     InquiryKeywordHash inquiry, std::int64_t, bool &result) {
1207   switch (inquiry) {
1208   case HashInquiryKeyword("PENDING"):
1209     result = false;
1210     return true;
1211   default:
1212     BadInquiryKeywordHashCrash(inquiry);
1213     return false;
1214   }
1215 }
1216 
1217 bool InquireNoUnitState::Inquire(
1218     InquiryKeywordHash inquiry, std::int64_t &result) {
1219   switch (inquiry) {
1220   case HashInquiryKeyword("NEXTREC"):
1221   case HashInquiryKeyword("NUMBER"):
1222   case HashInquiryKeyword("POS"):
1223   case HashInquiryKeyword("RECL"):
1224   case HashInquiryKeyword("SIZE"):
1225     result = -1;
1226     return true;
1227   default:
1228     BadInquiryKeywordHashCrash(inquiry);
1229     return false;
1230   }
1231 }
1232 
1233 InquireUnconnectedFileState::InquireUnconnectedFileState(
1234     OwningPtr<char> &&path, const char *sourceFile, int sourceLine)
1235     : NoUnitIoStatementState{sourceFile, sourceLine, *this}, path_{std::move(
1236                                                                  path)} {}
1237 
1238 bool InquireUnconnectedFileState::Inquire(
1239     InquiryKeywordHash inquiry, char *result, std::size_t length) {
1240   const char *str{nullptr};
1241   switch (inquiry) {
1242   case HashInquiryKeyword("ACCESS"):
1243   case HashInquiryKeyword("ACTION"):
1244   case HashInquiryKeyword("ASYNCHRONOUS"):
1245   case HashInquiryKeyword("BLANK"):
1246   case HashInquiryKeyword("CARRIAGECONTROL"):
1247   case HashInquiryKeyword("CONVERT"):
1248   case HashInquiryKeyword("DECIMAL"):
1249   case HashInquiryKeyword("DELIM"):
1250   case HashInquiryKeyword("FORM"):
1251   case HashInquiryKeyword("PAD"):
1252   case HashInquiryKeyword("POSITION"):
1253   case HashInquiryKeyword("ROUND"):
1254   case HashInquiryKeyword("SIGN"):
1255     str = "UNDEFINED";
1256     break;
1257   case HashInquiryKeyword("DIRECT"):
1258   case HashInquiryKeyword("ENCODING"):
1259   case HashInquiryKeyword("FORMATTED"):
1260   case HashInquiryKeyword("SEQUENTIAL"):
1261   case HashInquiryKeyword("STREAM"):
1262   case HashInquiryKeyword("UNFORMATTED"):
1263     str = "UNKNONN";
1264     break;
1265   case HashInquiryKeyword("READ"):
1266     str = MayRead(path_.get()) ? "YES" : "NO";
1267     break;
1268   case HashInquiryKeyword("READWRITE"):
1269     str = MayReadAndWrite(path_.get()) ? "YES" : "NO";
1270     break;
1271   case HashInquiryKeyword("WRITE"):
1272     str = MayWrite(path_.get()) ? "YES" : "NO";
1273     break;
1274   case HashInquiryKeyword("NAME"):
1275     str = path_.get();
1276     if (!str) {
1277       return true; // result is undefined
1278     }
1279     break;
1280   }
1281   if (str) {
1282     ToFortranDefaultCharacter(result, length, str);
1283     return true;
1284   } else {
1285     BadInquiryKeywordHashCrash(inquiry);
1286     return false;
1287   }
1288 }
1289 
1290 bool InquireUnconnectedFileState::Inquire(
1291     InquiryKeywordHash inquiry, bool &result) {
1292   switch (inquiry) {
1293   case HashInquiryKeyword("EXIST"):
1294     result = IsExtant(path_.get());
1295     return true;
1296   case HashInquiryKeyword("NAMED"):
1297     result = true;
1298     return true;
1299   case HashInquiryKeyword("OPENED"):
1300     result = false;
1301     return true;
1302   case HashInquiryKeyword("PENDING"):
1303     result = false;
1304     return true;
1305   default:
1306     BadInquiryKeywordHashCrash(inquiry);
1307     return false;
1308   }
1309 }
1310 
1311 bool InquireUnconnectedFileState::Inquire(
1312     InquiryKeywordHash inquiry, std::int64_t, bool &result) {
1313   switch (inquiry) {
1314   case HashInquiryKeyword("PENDING"):
1315     result = false;
1316     return true;
1317   default:
1318     BadInquiryKeywordHashCrash(inquiry);
1319     return false;
1320   }
1321 }
1322 
1323 bool InquireUnconnectedFileState::Inquire(
1324     InquiryKeywordHash inquiry, std::int64_t &result) {
1325   switch (inquiry) {
1326   case HashInquiryKeyword("NEXTREC"):
1327   case HashInquiryKeyword("NUMBER"):
1328   case HashInquiryKeyword("POS"):
1329   case HashInquiryKeyword("RECL"):
1330   case HashInquiryKeyword("SIZE"):
1331     result = -1;
1332     return true;
1333   default:
1334     BadInquiryKeywordHashCrash(inquiry);
1335     return false;
1336   }
1337 }
1338 
1339 InquireIOLengthState::InquireIOLengthState(
1340     const char *sourceFile, int sourceLine)
1341     : NoUnitIoStatementState{sourceFile, sourceLine, *this} {}
1342 
1343 bool InquireIOLengthState::Emit(const char *, std::size_t n, std::size_t) {
1344   bytes_ += n;
1345   return true;
1346 }
1347 
1348 bool InquireIOLengthState::Emit(const char *p, std::size_t n) {
1349   bytes_ += sizeof *p * n;
1350   return true;
1351 }
1352 
1353 bool InquireIOLengthState::Emit(const char16_t *p, std::size_t n) {
1354   bytes_ += sizeof *p * n;
1355   return true;
1356 }
1357 
1358 bool InquireIOLengthState::Emit(const char32_t *p, std::size_t n) {
1359   bytes_ += sizeof *p * n;
1360   return true;
1361 }
1362 
1363 int ErroneousIoStatementState::EndIoStatement() {
1364   SignalError(iostat_);
1365   return IoStatementBase::EndIoStatement();
1366 }
1367 
1368 } // namespace Fortran::runtime::io
1369