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) {
29   return false;
30 }
31 
32 bool IoStatementBase::Emit(const char16_t *, std::size_t) {
33   return false;
34 }
35 
36 bool IoStatementBase::Emit(const char32_t *, std::size_t) {
37   return false;
38 }
39 
40 std::optional<char32_t> IoStatementBase::GetCurrentChar() {
41   return std::nullopt;
42 }
43 
44 bool IoStatementBase::AdvanceRecord(int) { return false; }
45 
46 void IoStatementBase::BackspaceRecord() {}
47 
48 bool IoStatementBase::Receive(char *, std::size_t, std::size_t) {
49   return false;
50 }
51 
52 std::optional<DataEdit> IoStatementBase::GetNextDataEdit(
53     IoStatementState &, int) {
54   return std::nullopt;
55 }
56 
57 ExternalFileUnit *IoStatementBase::GetExternalFileUnit() const {
58   return nullptr;
59 }
60 
61 bool IoStatementBase::BeginReadingRecord() { return true; }
62 
63 void IoStatementBase::FinishReadingRecord() {}
64 
65 void IoStatementBase::HandleAbsolutePosition(std::int64_t) {}
66 
67 void IoStatementBase::HandleRelativePosition(std::int64_t) {}
68 
69 bool IoStatementBase::Inquire(InquiryKeywordHash, char *, std::size_t) {
70   return false;
71 }
72 
73 bool IoStatementBase::Inquire(InquiryKeywordHash, bool &) {
74   return false;
75 }
76 
77 bool IoStatementBase::Inquire(InquiryKeywordHash, std::int64_t, bool &) {
78   return false;
79 }
80 
81 bool IoStatementBase::Inquire(InquiryKeywordHash, std::int64_t &) {
82   return false;
83 }
84 
85 void IoStatementBase::BadInquiryKeywordHashCrash(InquiryKeywordHash inquiry) {
86   char buffer[16];
87   const char *decode{InquiryKeywordHashDecode(buffer, sizeof buffer, inquiry)};
88   Crash("bad InquiryKeywordHash 0x%x (%s)", inquiry,
89       decode ? decode : "(cannot decode)");
90 }
91 
92 template <Direction DIR, typename CHAR>
93 InternalIoStatementState<DIR, CHAR>::InternalIoStatementState(
94     Buffer scalar, std::size_t length, const char *sourceFile, int sourceLine)
95     : IoStatementBase{sourceFile, sourceLine}, unit_{scalar, length} {}
96 
97 template <Direction DIR, typename CHAR>
98 InternalIoStatementState<DIR, CHAR>::InternalIoStatementState(
99     const Descriptor &d, const char *sourceFile, int sourceLine)
100     : IoStatementBase{sourceFile, sourceLine}, unit_{d, *this} {}
101 
102 template <Direction DIR, typename CHAR>
103 bool InternalIoStatementState<DIR, CHAR>::Emit(
104     const CharType *data, std::size_t chars) {
105   if constexpr (DIR == Direction::Input) {
106     Crash("InternalIoStatementState<Direction::Input>::Emit() called");
107     return false;
108   }
109   return unit_.Emit(data, chars * sizeof(CharType), *this);
110 }
111 
112 template <Direction DIR, typename CHAR>
113 std::optional<char32_t> InternalIoStatementState<DIR, CHAR>::GetCurrentChar() {
114   if constexpr (DIR == Direction::Output) {
115     Crash(
116         "InternalIoStatementState<Direction::Output>::GetCurrentChar() called");
117     return std::nullopt;
118   }
119   return unit_.GetCurrentChar(*this);
120 }
121 
122 template <Direction DIR, typename CHAR>
123 bool InternalIoStatementState<DIR, CHAR>::AdvanceRecord(int n) {
124   while (n-- > 0) {
125     if (!unit_.AdvanceRecord(*this)) {
126       return false;
127     }
128   }
129   return true;
130 }
131 
132 template <Direction DIR, typename CHAR>
133 void InternalIoStatementState<DIR, CHAR>::BackspaceRecord() {
134   unit_.BackspaceRecord(*this);
135 }
136 
137 template <Direction DIR, typename CHAR>
138 int InternalIoStatementState<DIR, CHAR>::EndIoStatement() {
139   if constexpr (DIR == Direction::Output) {
140     unit_.EndIoStatement(); // fill
141   }
142   auto result{IoStatementBase::EndIoStatement()};
143   if (free_) {
144     FreeMemory(this);
145   }
146   return result;
147 }
148 
149 template <Direction DIR, typename CHAR>
150 void InternalIoStatementState<DIR, CHAR>::HandleAbsolutePosition(
151     std::int64_t n) {
152   return unit_.HandleAbsolutePosition(n);
153 }
154 
155 template <Direction DIR, typename CHAR>
156 void InternalIoStatementState<DIR, CHAR>::HandleRelativePosition(
157     std::int64_t n) {
158   return unit_.HandleRelativePosition(n);
159 }
160 
161 template <Direction DIR, typename CHAR>
162 InternalFormattedIoStatementState<DIR, CHAR>::InternalFormattedIoStatementState(
163     Buffer buffer, std::size_t length, const CHAR *format,
164     std::size_t formatLength, const char *sourceFile, int sourceLine)
165     : InternalIoStatementState<DIR, CHAR>{buffer, length, sourceFile,
166           sourceLine},
167       ioStatementState_{*this}, format_{*this, format, formatLength} {}
168 
169 template <Direction DIR, typename CHAR>
170 InternalFormattedIoStatementState<DIR, CHAR>::InternalFormattedIoStatementState(
171     const Descriptor &d, const CHAR *format, std::size_t formatLength,
172     const char *sourceFile, int sourceLine)
173     : InternalIoStatementState<DIR, CHAR>{d, sourceFile, sourceLine},
174       ioStatementState_{*this}, format_{*this, format, formatLength} {}
175 
176 template <Direction DIR, typename CHAR>
177 int InternalFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
178   if constexpr (DIR == Direction::Output) {
179     format_.Finish(*this); // ignore any remaining input positioning actions
180   }
181   return InternalIoStatementState<DIR, CHAR>::EndIoStatement();
182 }
183 
184 template <Direction DIR, typename CHAR>
185 InternalListIoStatementState<DIR, CHAR>::InternalListIoStatementState(
186     Buffer buffer, std::size_t length, const char *sourceFile, int sourceLine)
187     : InternalIoStatementState<DIR, CharType>{buffer, length, sourceFile,
188           sourceLine},
189       ioStatementState_{*this} {}
190 
191 template <Direction DIR, typename CHAR>
192 InternalListIoStatementState<DIR, CHAR>::InternalListIoStatementState(
193     const Descriptor &d, const char *sourceFile, int sourceLine)
194     : InternalIoStatementState<DIR, CharType>{d, sourceFile, sourceLine},
195       ioStatementState_{*this} {}
196 
197 ExternalIoStatementBase::ExternalIoStatementBase(
198     ExternalFileUnit &unit, const char *sourceFile, int sourceLine)
199     : IoStatementBase{sourceFile, sourceLine}, unit_{unit} {}
200 
201 MutableModes &ExternalIoStatementBase::mutableModes() { return unit_.modes; }
202 
203 ConnectionState &ExternalIoStatementBase::GetConnectionState() { return unit_; }
204 
205 int ExternalIoStatementBase::EndIoStatement() {
206   if (mutableModes().nonAdvancing) {
207     unit_.leftTabLimit = unit_.furthestPositionInRecord;
208   } else {
209     unit_.leftTabLimit.reset();
210   }
211   auto result{IoStatementBase::EndIoStatement()};
212   unit_.EndIoStatement(); // annihilates *this in unit_.u_
213   return result;
214 }
215 
216 void OpenStatementState::set_path(const char *path, std::size_t length) {
217   pathLength_ = TrimTrailingSpaces(path, length);
218   path_ = SaveDefaultCharacter(path, pathLength_, *this);
219 }
220 
221 int OpenStatementState::EndIoStatement() {
222   if (path_.get() || wasExtant_ ||
223       (status_ && *status_ == OpenStatus::Scratch)) {
224     unit().OpenUnit(status_, action_, position_, std::move(path_), pathLength_,
225         convert_, *this);
226   } else {
227     unit().OpenAnonymousUnit(status_, action_, position_, convert_, *this);
228   }
229   if (access_) {
230     if (*access_ != unit().access) {
231       if (wasExtant_) {
232         SignalError("ACCESS= may not be changed on an open unit");
233       }
234     }
235     unit().access = *access_;
236   }
237   if (!unit().isUnformatted) {
238     unit().isUnformatted = isUnformatted_;
239   }
240   if (isUnformatted_ && *isUnformatted_ != *unit().isUnformatted) {
241     if (wasExtant_) {
242       SignalError("FORM= may not be changed on an open unit");
243     }
244     unit().isUnformatted = *isUnformatted_;
245   }
246   if (!unit().isUnformatted) {
247     // Set default format (C.7.4 point 2).
248     unit().isUnformatted = unit().access != Access::Sequential;
249   }
250   return ExternalIoStatementBase::EndIoStatement();
251 }
252 
253 int CloseStatementState::EndIoStatement() {
254   int result{ExternalIoStatementBase::EndIoStatement()};
255   unit().CloseUnit(status_, *this);
256   unit().DestroyClosed();
257   return result;
258 }
259 
260 int NoUnitIoStatementState::EndIoStatement() {
261   auto result{IoStatementBase::EndIoStatement()};
262   FreeMemory(this);
263   return result;
264 }
265 
266 template <Direction DIR>
267 ExternalIoStatementState<DIR>::ExternalIoStatementState(
268     ExternalFileUnit &unit, const char *sourceFile, int sourceLine)
269     : ExternalIoStatementBase{unit, sourceFile, sourceLine}, mutableModes_{
270                                                                  unit.modes} {}
271 
272 template <Direction DIR> int ExternalIoStatementState<DIR>::EndIoStatement() {
273   if constexpr (DIR == Direction::Input) {
274     BeginReadingRecord(); // in case there were no I/O items
275     if (!mutableModes().nonAdvancing || GetIoStat() == IostatEor) {
276       FinishReadingRecord();
277     }
278   } else {
279     if (!mutableModes().nonAdvancing) {
280       unit().AdvanceRecord(*this);
281     }
282     unit().FlushIfTerminal(*this);
283   }
284   return ExternalIoStatementBase::EndIoStatement();
285 }
286 
287 template <Direction DIR>
288 bool ExternalIoStatementState<DIR>::Emit(
289     const char *data, std::size_t bytes, std::size_t elementBytes) {
290   if constexpr (DIR == Direction::Input) {
291     Crash("ExternalIoStatementState::Emit(char) called for input statement");
292   }
293   return unit().Emit(data, bytes, elementBytes, *this);
294 }
295 
296 template <Direction DIR>
297 bool ExternalIoStatementState<DIR>::Emit(const char *data, std::size_t bytes) {
298   if constexpr (DIR == Direction::Input) {
299     Crash("ExternalIoStatementState::Emit(char) called for input statement");
300   }
301   return unit().Emit(data, bytes, 0, *this);
302 }
303 
304 template <Direction DIR>
305 bool ExternalIoStatementState<DIR>::Emit(
306     const char16_t *data, std::size_t chars) {
307   if constexpr (DIR == Direction::Input) {
308     Crash(
309         "ExternalIoStatementState::Emit(char16_t) called for input statement");
310   }
311   // TODO: UTF-8 encoding
312   return unit().Emit(reinterpret_cast<const char *>(data), chars * sizeof *data,
313       sizeof *data, *this);
314 }
315 
316 template <Direction DIR>
317 bool ExternalIoStatementState<DIR>::Emit(
318     const char32_t *data, std::size_t chars) {
319   if constexpr (DIR == Direction::Input) {
320     Crash(
321         "ExternalIoStatementState::Emit(char32_t) called for input statement");
322   }
323   // TODO: UTF-8 encoding
324   return unit().Emit(reinterpret_cast<const char *>(data), chars * sizeof *data,
325       sizeof *data, *this);
326 }
327 
328 template <Direction DIR>
329 std::optional<char32_t> ExternalIoStatementState<DIR>::GetCurrentChar() {
330   if constexpr (DIR == Direction::Output) {
331     Crash(
332         "ExternalIoStatementState<Direction::Output>::GetCurrentChar() called");
333   }
334   return unit().GetCurrentChar(*this);
335 }
336 
337 template <Direction DIR>
338 bool ExternalIoStatementState<DIR>::AdvanceRecord(int n) {
339   while (n-- > 0) {
340     if (!unit().AdvanceRecord(*this)) {
341       return false;
342     }
343   }
344   return true;
345 }
346 
347 template <Direction DIR> void ExternalIoStatementState<DIR>::BackspaceRecord() {
348   unit().BackspaceRecord(*this);
349 }
350 
351 template <Direction DIR>
352 void ExternalIoStatementState<DIR>::HandleAbsolutePosition(std::int64_t n) {
353   return unit().HandleAbsolutePosition(n);
354 }
355 
356 template <Direction DIR>
357 void ExternalIoStatementState<DIR>::HandleRelativePosition(std::int64_t n) {
358   return unit().HandleRelativePosition(n);
359 }
360 
361 template <Direction DIR>
362 bool ExternalIoStatementState<DIR>::BeginReadingRecord() {
363   if constexpr (DIR == Direction::Input) {
364     return unit().BeginReadingRecord(*this);
365   } else {
366     Crash("ExternalIoStatementState<Direction::Output>::BeginReadingRecord() "
367           "called");
368     return false;
369   }
370 }
371 
372 template <Direction DIR>
373 void ExternalIoStatementState<DIR>::FinishReadingRecord() {
374   if constexpr (DIR == Direction::Input) {
375     unit().FinishReadingRecord(*this);
376   } else {
377     Crash("ExternalIoStatementState<Direction::Output>::FinishReadingRecord() "
378           "called");
379   }
380 }
381 
382 template <Direction DIR, typename CHAR>
383 ExternalFormattedIoStatementState<DIR, CHAR>::ExternalFormattedIoStatementState(
384     ExternalFileUnit &unit, const CHAR *format, std::size_t formatLength,
385     const char *sourceFile, int sourceLine)
386     : ExternalIoStatementState<DIR>{unit, sourceFile, sourceLine},
387       format_{*this, format, formatLength} {}
388 
389 template <Direction DIR, typename CHAR>
390 int ExternalFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
391   format_.Finish(*this);
392   return ExternalIoStatementState<DIR>::EndIoStatement();
393 }
394 
395 std::optional<DataEdit> IoStatementState::GetNextDataEdit(int n) {
396   return std::visit(
397       [&](auto &x) { return x.get().GetNextDataEdit(*this, n); }, u_);
398 }
399 
400 bool IoStatementState::Emit(
401     const char *data, std::size_t n, std::size_t elementBytes) {
402   return std::visit(
403       [=](auto &x) { return x.get().Emit(data, n, elementBytes); }, u_);
404 }
405 
406 bool IoStatementState::Emit(const char *data, std::size_t n) {
407   return std::visit([=](auto &x) { return x.get().Emit(data, n); }, u_);
408 }
409 
410 bool IoStatementState::Emit(const char16_t *data, std::size_t chars) {
411   return std::visit([=](auto &x) { return x.get().Emit(data, chars); }, u_);
412 }
413 
414 bool IoStatementState::Emit(const char32_t *data, std::size_t chars) {
415   return std::visit([=](auto &x) { return x.get().Emit(data, chars); }, u_);
416 }
417 
418 bool IoStatementState::Receive(
419     char *data, std::size_t n, std::size_t elementBytes) {
420   return std::visit(
421       [=](auto &x) { return x.get().Receive(data, n, elementBytes); }, u_);
422 }
423 
424 std::optional<char32_t> IoStatementState::GetCurrentChar() {
425   return std::visit([&](auto &x) { return x.get().GetCurrentChar(); }, u_);
426 }
427 
428 bool IoStatementState::AdvanceRecord(int n) {
429   return std::visit([=](auto &x) { return x.get().AdvanceRecord(n); }, u_);
430 }
431 
432 void IoStatementState::BackspaceRecord() {
433   std::visit([](auto &x) { x.get().BackspaceRecord(); }, u_);
434 }
435 
436 void IoStatementState::HandleRelativePosition(std::int64_t n) {
437   std::visit([=](auto &x) { x.get().HandleRelativePosition(n); }, u_);
438 }
439 
440 void IoStatementState::HandleAbsolutePosition(std::int64_t n) {
441   std::visit([=](auto &x) { x.get().HandleAbsolutePosition(n); }, u_);
442 }
443 
444 int IoStatementState::EndIoStatement() {
445   return std::visit([](auto &x) { return x.get().EndIoStatement(); }, u_);
446 }
447 
448 ConnectionState &IoStatementState::GetConnectionState() {
449   return std::visit(
450       [](auto &x) -> ConnectionState & { return x.get().GetConnectionState(); },
451       u_);
452 }
453 
454 MutableModes &IoStatementState::mutableModes() {
455   return std::visit(
456       [](auto &x) -> MutableModes & { return x.get().mutableModes(); }, u_);
457 }
458 
459 bool IoStatementState::BeginReadingRecord() {
460   return std::visit([](auto &x) { return x.get().BeginReadingRecord(); }, u_);
461 }
462 
463 IoErrorHandler &IoStatementState::GetIoErrorHandler() const {
464   return std::visit(
465       [](auto &x) -> IoErrorHandler & {
466         return static_cast<IoErrorHandler &>(x.get());
467       },
468       u_);
469 }
470 
471 ExternalFileUnit *IoStatementState::GetExternalFileUnit() const {
472   return std::visit([](auto &x) { return x.get().GetExternalFileUnit(); }, u_);
473 }
474 
475 bool IoStatementState::EmitRepeated(char ch, std::size_t n) {
476   return std::visit(
477       [=](auto &x) {
478         for (std::size_t j{0}; j < n; ++j) {
479           if (!x.get().Emit(&ch, 1)) {
480             return false;
481           }
482         }
483         return true;
484       },
485       u_);
486 }
487 
488 bool IoStatementState::EmitField(
489     const char *p, std::size_t length, std::size_t width) {
490   if (width <= 0) {
491     width = static_cast<int>(length);
492   }
493   if (length > static_cast<std::size_t>(width)) {
494     return EmitRepeated('*', width);
495   } else {
496     return EmitRepeated(' ', static_cast<int>(width - length)) &&
497         Emit(p, length);
498   }
499 }
500 
501 std::optional<char32_t> IoStatementState::PrepareInput(
502     const DataEdit &edit, std::optional<int> &remaining) {
503   remaining.reset();
504   if (edit.descriptor == DataEdit::ListDirected) {
505     GetNextNonBlank();
506   } else {
507     if (edit.width.value_or(0) > 0) {
508       remaining = *edit.width;
509     }
510     SkipSpaces(remaining);
511   }
512   return NextInField(remaining);
513 }
514 
515 std::optional<char32_t> IoStatementState::SkipSpaces(
516     std::optional<int> &remaining) {
517   while (!remaining || *remaining > 0) {
518     if (auto ch{GetCurrentChar()}) {
519       if (*ch != ' ' && *ch != '\t') {
520         return ch;
521       }
522       HandleRelativePosition(1);
523       if (remaining) {
524         GotChar();
525         --*remaining;
526       }
527     } else {
528       break;
529     }
530   }
531   return std::nullopt;
532 }
533 
534 std::optional<char32_t> IoStatementState::NextInField(
535     std::optional<int> &remaining) {
536   if (!remaining) { // list-directed or NAMELIST: check for separators
537     if (auto next{GetCurrentChar()}) {
538       switch (*next) {
539       case ' ':
540       case '\t':
541       case ',':
542       case ';':
543       case '/':
544       case '(':
545       case ')':
546       case '\'':
547       case '"':
548       case '*':
549       case '\n': // for stream access
550         break;
551       default:
552         HandleRelativePosition(1);
553         return next;
554       }
555     }
556   } else if (*remaining > 0) {
557     if (auto next{GetCurrentChar()}) {
558       --*remaining;
559       HandleRelativePosition(1);
560       GotChar();
561       return next;
562     }
563     const ConnectionState &connection{GetConnectionState()};
564     if (!connection.IsAtEOF() && connection.recordLength &&
565         connection.positionInRecord >= *connection.recordLength) {
566       IoErrorHandler &handler{GetIoErrorHandler()};
567       if (mutableModes().nonAdvancing) {
568         handler.SignalEor();
569       } else if (connection.isFixedRecordLength && !connection.modes.pad) {
570         handler.SignalError(IostatRecordReadOverrun);
571       }
572       if (connection.modes.pad) { // PAD='YES'
573         --*remaining;
574         return std::optional<char32_t>{' '};
575       }
576     }
577   }
578   return std::nullopt;
579 }
580 
581 std::optional<char32_t> IoStatementState::GetNextNonBlank() {
582   auto ch{GetCurrentChar()};
583   bool inNamelist{GetConnectionState().modes.inNamelist};
584   while (!ch || *ch == ' ' || *ch == '\t' || (inNamelist && *ch == '!')) {
585     if (ch && (*ch == ' ' || *ch == '\t')) {
586       HandleRelativePosition(1);
587     } else if (!AdvanceRecord()) {
588       return std::nullopt;
589     }
590     ch = GetCurrentChar();
591   }
592   return ch;
593 }
594 
595 bool IoStatementState::Inquire(
596     InquiryKeywordHash inquiry, char *out, std::size_t chars) {
597   return std::visit(
598       [&](auto &x) { return x.get().Inquire(inquiry, out, chars); }, u_);
599 }
600 
601 bool IoStatementState::Inquire(InquiryKeywordHash inquiry, bool &out) {
602   return std::visit([&](auto &x) { return x.get().Inquire(inquiry, out); }, u_);
603 }
604 
605 bool IoStatementState::Inquire(
606     InquiryKeywordHash inquiry, std::int64_t id, bool &out) {
607   return std::visit(
608       [&](auto &x) { return x.get().Inquire(inquiry, id, out); }, u_);
609 }
610 
611 bool IoStatementState::Inquire(InquiryKeywordHash inquiry, std::int64_t &n) {
612   return std::visit([&](auto &x) { return x.get().Inquire(inquiry, n); }, u_);
613 }
614 
615 void IoStatementState::GotChar(int n) {
616   if (auto *formattedIn{
617           get_if<FormattedIoStatementState<Direction::Input>>()}) {
618     formattedIn->GotChar(n);
619   } else {
620     GetIoErrorHandler().Crash("IoStatementState::GotChar() called for "
621                               "statement that is not formatted input");
622   }
623 }
624 
625 std::size_t
626 FormattedIoStatementState<Direction::Input>::GetEditDescriptorChars() const {
627   return chars_;
628 }
629 
630 void FormattedIoStatementState<Direction::Input>::GotChar(int n) {
631   chars_ += n;
632 }
633 
634 bool ListDirectedStatementState<Direction::Output>::EmitLeadingSpaceOrAdvance(
635     IoStatementState &io, std::size_t length, bool isCharacter) {
636   if (length == 0) {
637     return true;
638   }
639   const ConnectionState &connection{io.GetConnectionState()};
640   int space{connection.positionInRecord == 0 ||
641       !(isCharacter && lastWasUndelimitedCharacter())};
642   set_lastWasUndelimitedCharacter(false);
643   if (connection.NeedAdvance(space + length)) {
644     return io.AdvanceRecord();
645   }
646   if (space) {
647     return io.Emit(" ", 1);
648   }
649   return true;
650 }
651 
652 std::optional<DataEdit>
653 ListDirectedStatementState<Direction::Output>::GetNextDataEdit(
654     IoStatementState &io, int maxRepeat) {
655   DataEdit edit;
656   edit.descriptor = DataEdit::ListDirected;
657   edit.repeat = maxRepeat;
658   edit.modes = io.mutableModes();
659   return edit;
660 }
661 
662 std::optional<DataEdit>
663 ListDirectedStatementState<Direction::Input>::GetNextDataEdit(
664     IoStatementState &io, int maxRepeat) {
665   // N.B. list-directed transfers cannot be nonadvancing (C1221)
666   ConnectionState &connection{io.GetConnectionState()};
667   DataEdit edit;
668   edit.descriptor = DataEdit::ListDirected;
669   edit.repeat = 1; // may be overridden below
670   edit.modes = connection.modes;
671   if (hitSlash_) { // everything after '/' is nullified
672     edit.descriptor = DataEdit::ListDirectedNullValue;
673     return edit;
674   }
675   char32_t comma{','};
676   if (io.mutableModes().editingFlags & decimalComma) {
677     comma = ';';
678   }
679   if (remaining_ > 0 && !realPart_) { // "r*c" repetition in progress
680     RUNTIME_CHECK(
681         io.GetIoErrorHandler(), connection.resumptionRecordNumber.has_value());
682     while (connection.currentRecordNumber >
683         connection.resumptionRecordNumber.value_or(
684             connection.currentRecordNumber)) {
685       io.BackspaceRecord();
686     }
687     connection.HandleAbsolutePosition(repeatPositionInRecord_);
688     if (!imaginaryPart_) {
689       edit.repeat = std::min<int>(remaining_, maxRepeat);
690       auto ch{io.GetCurrentChar()};
691       if (!ch || *ch == ' ' || *ch == '\t' || *ch == comma) {
692         // "r*" repeated null
693         edit.descriptor = DataEdit::ListDirectedNullValue;
694       }
695     }
696     remaining_ -= edit.repeat;
697     if (remaining_ <= 0) {
698       connection.resumptionRecordNumber.reset();
699     }
700     return edit;
701   }
702   // Skip separators, handle a "r*c" repeat count; see 13.10.2 in Fortran 2018
703   if (imaginaryPart_) {
704     imaginaryPart_ = false;
705   } else if (realPart_) {
706     realPart_ = false;
707     imaginaryPart_ = true;
708     edit.descriptor = DataEdit::ListDirectedImaginaryPart;
709   }
710   auto ch{io.GetNextNonBlank()};
711   if (ch && *ch == comma && eatComma_) {
712     // Consume comma & whitespace after previous item.
713     // This includes the comma between real and imaginary components
714     // in list-directed/NAMELIST complex input.
715     io.HandleRelativePosition(1);
716     ch = io.GetNextNonBlank();
717   }
718   eatComma_ = true;
719   if (!ch) {
720     return std::nullopt;
721   }
722   if (*ch == '/') {
723     hitSlash_ = true;
724     edit.descriptor = DataEdit::ListDirectedNullValue;
725     return edit;
726   }
727   if (*ch == comma) { // separator: null value
728     edit.descriptor = DataEdit::ListDirectedNullValue;
729     return edit;
730   }
731   if (imaginaryPart_) { // can't repeat components
732     return edit;
733   }
734   if (*ch >= '0' && *ch <= '9') { // look for "r*" repetition count
735     auto start{connection.positionInRecord};
736     int r{0};
737     do {
738       static auto constexpr clamp{(std::numeric_limits<int>::max() - '9') / 10};
739       if (r >= clamp) {
740         r = 0;
741         break;
742       }
743       r = 10 * r + (*ch - '0');
744       io.HandleRelativePosition(1);
745       ch = io.GetCurrentChar();
746     } while (ch && *ch >= '0' && *ch <= '9');
747     if (r > 0 && ch && *ch == '*') { // subtle: r must be nonzero
748       io.HandleRelativePosition(1);
749       ch = io.GetCurrentChar();
750       if (ch && *ch == '/') { // r*/
751         hitSlash_ = true;
752         edit.descriptor = DataEdit::ListDirectedNullValue;
753         return edit;
754       }
755       if (!ch || *ch == ' ' || *ch == '\t' || *ch == comma) { // "r*" null
756         edit.descriptor = DataEdit::ListDirectedNullValue;
757       }
758       edit.repeat = std::min<int>(r, maxRepeat);
759       remaining_ = r - edit.repeat;
760       if (remaining_ > 0) {
761         connection.resumptionRecordNumber = connection.currentRecordNumber;
762       } else {
763         connection.resumptionRecordNumber.reset();
764       }
765       repeatPositionInRecord_ = connection.positionInRecord;
766     } else { // not a repetition count, just an integer value; rewind
767       connection.positionInRecord = start;
768     }
769   }
770   if (!imaginaryPart_ && ch && *ch == '(') {
771     realPart_ = true;
772     io.HandleRelativePosition(1);
773     edit.descriptor = DataEdit::ListDirectedRealPart;
774   }
775   return edit;
776 }
777 
778 template <Direction DIR>
779 bool ExternalUnformattedIoStatementState<DIR>::Receive(
780     char *data, std::size_t bytes, std::size_t elementBytes) {
781   if constexpr (DIR == Direction::Output) {
782     this->Crash("ExternalUnformattedIoStatementState::Receive() called for "
783                 "output statement");
784   }
785   return this->unit().Receive(data, bytes, elementBytes, *this);
786 }
787 
788 template <Direction DIR>
789 ChildIoStatementState<DIR>::ChildIoStatementState(
790     ChildIo &child, const char *sourceFile, int sourceLine)
791     : IoStatementBase{sourceFile, sourceLine}, child_{child} {}
792 
793 template <Direction DIR>
794 MutableModes &ChildIoStatementState<DIR>::mutableModes() {
795   return child_.parent().mutableModes();
796 }
797 
798 template <Direction DIR>
799 ConnectionState &ChildIoStatementState<DIR>::GetConnectionState() {
800   return child_.parent().GetConnectionState();
801 }
802 
803 template <Direction DIR>
804 ExternalFileUnit *ChildIoStatementState<DIR>::GetExternalFileUnit() const {
805   return child_.parent().GetExternalFileUnit();
806 }
807 
808 template <Direction DIR> int ChildIoStatementState<DIR>::EndIoStatement() {
809   auto result{IoStatementBase::EndIoStatement()};
810   child_.EndIoStatement(); // annihilates *this in child_.u_
811   return result;
812 }
813 
814 template <Direction DIR>
815 bool ChildIoStatementState<DIR>::Emit(
816     const char *data, std::size_t bytes, std::size_t elementBytes) {
817   return child_.parent().Emit(data, bytes, elementBytes);
818 }
819 
820 template <Direction DIR>
821 bool ChildIoStatementState<DIR>::Emit(const char *data, std::size_t bytes) {
822   return child_.parent().Emit(data, bytes);
823 }
824 
825 template <Direction DIR>
826 bool ChildIoStatementState<DIR>::Emit(const char16_t *data, std::size_t chars) {
827   return child_.parent().Emit(data, chars);
828 }
829 
830 template <Direction DIR>
831 bool ChildIoStatementState<DIR>::Emit(const char32_t *data, std::size_t chars) {
832   return child_.parent().Emit(data, chars);
833 }
834 
835 template <Direction DIR>
836 std::optional<char32_t> ChildIoStatementState<DIR>::GetCurrentChar() {
837   return child_.parent().GetCurrentChar();
838 }
839 
840 template <Direction DIR>
841 void ChildIoStatementState<DIR>::HandleAbsolutePosition(std::int64_t n) {
842   return child_.parent().HandleAbsolutePosition(n);
843 }
844 
845 template <Direction DIR>
846 void ChildIoStatementState<DIR>::HandleRelativePosition(std::int64_t n) {
847   return child_.parent().HandleRelativePosition(n);
848 }
849 
850 template <Direction DIR, typename CHAR>
851 ChildFormattedIoStatementState<DIR, CHAR>::ChildFormattedIoStatementState(
852     ChildIo &child, const CHAR *format, std::size_t formatLength,
853     const char *sourceFile, int sourceLine)
854     : ChildIoStatementState<DIR>{child, sourceFile, sourceLine},
855       mutableModes_{child.parent().mutableModes()}, format_{*this, format,
856                                                         formatLength} {}
857 
858 template <Direction DIR, typename CHAR>
859 int ChildFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
860   format_.Finish(*this);
861   return ChildIoStatementState<DIR>::EndIoStatement();
862 }
863 
864 template <Direction DIR, typename CHAR>
865 bool ChildFormattedIoStatementState<DIR, CHAR>::AdvanceRecord(int) {
866   return false; // no can do in a child I/O
867 }
868 
869 template <Direction DIR>
870 bool ChildUnformattedIoStatementState<DIR>::Receive(
871     char *data, std::size_t bytes, std::size_t elementBytes) {
872   return this->child().parent().Receive(data, bytes, elementBytes);
873 }
874 
875 template class InternalIoStatementState<Direction::Output>;
876 template class InternalIoStatementState<Direction::Input>;
877 template class InternalFormattedIoStatementState<Direction::Output>;
878 template class InternalFormattedIoStatementState<Direction::Input>;
879 template class InternalListIoStatementState<Direction::Output>;
880 template class InternalListIoStatementState<Direction::Input>;
881 template class ExternalIoStatementState<Direction::Output>;
882 template class ExternalIoStatementState<Direction::Input>;
883 template class ExternalFormattedIoStatementState<Direction::Output>;
884 template class ExternalFormattedIoStatementState<Direction::Input>;
885 template class ExternalListIoStatementState<Direction::Output>;
886 template class ExternalListIoStatementState<Direction::Input>;
887 template class ExternalUnformattedIoStatementState<Direction::Output>;
888 template class ExternalUnformattedIoStatementState<Direction::Input>;
889 template class ChildIoStatementState<Direction::Output>;
890 template class ChildIoStatementState<Direction::Input>;
891 template class ChildFormattedIoStatementState<Direction::Output>;
892 template class ChildFormattedIoStatementState<Direction::Input>;
893 template class ChildListIoStatementState<Direction::Output>;
894 template class ChildListIoStatementState<Direction::Input>;
895 template class ChildUnformattedIoStatementState<Direction::Output>;
896 template class ChildUnformattedIoStatementState<Direction::Input>;
897 
898 int ExternalMiscIoStatementState::EndIoStatement() {
899   ExternalFileUnit &ext{unit()};
900   switch (which_) {
901   case Flush:
902     ext.FlushOutput(*this);
903     std::fflush(nullptr); // flushes C stdio output streams (12.9(2))
904     break;
905   case Backspace:
906     ext.BackspaceRecord(*this);
907     break;
908   case Endfile:
909     ext.Endfile(*this);
910     break;
911   case Rewind:
912     ext.Rewind(*this);
913     break;
914   }
915   return ExternalIoStatementBase::EndIoStatement();
916 }
917 
918 InquireUnitState::InquireUnitState(
919     ExternalFileUnit &unit, const char *sourceFile, int sourceLine)
920     : ExternalIoStatementBase{unit, sourceFile, sourceLine} {}
921 
922 bool InquireUnitState::Inquire(
923     InquiryKeywordHash inquiry, char *result, std::size_t length) {
924   if (unit().createdForInternalChildIo()) {
925     SignalError(IostatInquireInternalUnit,
926         "INQUIRE of unit created for defined derived type I/O of an internal "
927         "unit");
928     return false;
929   }
930   const char *str{nullptr};
931   switch (inquiry) {
932   case HashInquiryKeyword("ACCESS"):
933     switch (unit().access) {
934     case Access::Sequential:
935       str = "SEQUENTIAL";
936       break;
937     case Access::Direct:
938       str = "DIRECT";
939       break;
940     case Access::Stream:
941       str = "STREAM";
942       break;
943     }
944     break;
945   case HashInquiryKeyword("ACTION"):
946     str = unit().mayWrite() ? unit().mayRead() ? "READWRITE" : "WRITE" : "READ";
947     break;
948   case HashInquiryKeyword("ASYNCHRONOUS"):
949     str = unit().mayAsynchronous() ? "YES" : "NO";
950     break;
951   case HashInquiryKeyword("BLANK"):
952     str = unit().isUnformatted.value_or(true)   ? "UNDEFINED"
953         : unit().modes.editingFlags & blankZero ? "ZERO"
954                                                 : "NULL";
955     break;
956   case HashInquiryKeyword("CARRIAGECONTROL"):
957     str = "LIST";
958     break;
959   case HashInquiryKeyword("CONVERT"):
960     str = unit().swapEndianness() ? "SWAP" : "NATIVE";
961     break;
962   case HashInquiryKeyword("DECIMAL"):
963     str = unit().isUnformatted.value_or(true)      ? "UNDEFINED"
964         : unit().modes.editingFlags & decimalComma ? "COMMA"
965                                                    : "POINT";
966     break;
967   case HashInquiryKeyword("DELIM"):
968     if (unit().isUnformatted.value_or(true)) {
969       str = "UNDEFINED";
970     } else {
971       switch (unit().modes.delim) {
972       case '\'':
973         str = "APOSTROPHE";
974         break;
975       case '"':
976         str = "QUOTE";
977         break;
978       default:
979         str = "NONE";
980         break;
981       }
982     }
983     break;
984   case HashInquiryKeyword("DIRECT"):
985     str = unit().access == Access::Direct ||
986             (unit().mayPosition() && unit().isFixedRecordLength)
987         ? "YES"
988         : "NO";
989     break;
990   case HashInquiryKeyword("ENCODING"):
991     str = unit().isUnformatted.value_or(true) ? "UNDEFINED"
992         : unit().isUTF8                       ? "UTF-8"
993                                               : "ASCII";
994     break;
995   case HashInquiryKeyword("FORM"):
996     str = !unit().isUnformatted ? "UNDEFINED"
997         : *unit().isUnformatted ? "UNFORMATTED"
998                                 : "FORMATTED";
999     break;
1000   case HashInquiryKeyword("FORMATTED"):
1001     str = !unit().isUnformatted ? "UNKNOWN"
1002         : *unit().isUnformatted ? "NO"
1003                                 : "YES";
1004     break;
1005   case HashInquiryKeyword("NAME"):
1006     str = unit().path();
1007     if (!str) {
1008       return true; // result is undefined
1009     }
1010     break;
1011   case HashInquiryKeyword("PAD"):
1012     str = unit().isUnformatted.value_or(true) ? "UNDEFINED"
1013         : unit().modes.pad                    ? "YES"
1014                                               : "NO";
1015     break;
1016   case HashInquiryKeyword("POSITION"):
1017     if (unit().access == Access::Direct) {
1018       str = "UNDEFINED";
1019     } else {
1020       auto size{unit().knownSize()};
1021       auto pos{unit().position()};
1022       if (pos == size.value_or(pos + 1)) {
1023         str = "APPEND";
1024       } else if (pos == 0) {
1025         str = "REWIND";
1026       } else {
1027         str = "ASIS"; // processor-dependent & no common behavior
1028       }
1029     }
1030     break;
1031   case HashInquiryKeyword("READ"):
1032     str = unit().mayRead() ? "YES" : "NO";
1033     break;
1034   case HashInquiryKeyword("READWRITE"):
1035     str = unit().mayRead() && unit().mayWrite() ? "YES" : "NO";
1036     break;
1037   case HashInquiryKeyword("ROUND"):
1038     if (unit().isUnformatted.value_or(true)) {
1039       str = "UNDEFINED";
1040     } else {
1041       switch (unit().modes.round) {
1042       case decimal::FortranRounding::RoundNearest:
1043         str = "NEAREST";
1044         break;
1045       case decimal::FortranRounding::RoundUp:
1046         str = "UP";
1047         break;
1048       case decimal::FortranRounding::RoundDown:
1049         str = "DOWN";
1050         break;
1051       case decimal::FortranRounding::RoundToZero:
1052         str = "ZERO";
1053         break;
1054       case decimal::FortranRounding::RoundCompatible:
1055         str = "COMPATIBLE";
1056         break;
1057       }
1058     }
1059     break;
1060   case HashInquiryKeyword("SEQUENTIAL"):
1061     // "NO" for Direct, since Sequential would not work if
1062     // the unit were reopened without RECL=.
1063     str = unit().access == Access::Sequential ? "YES" : "NO";
1064     break;
1065   case HashInquiryKeyword("SIGN"):
1066     str = unit().isUnformatted.value_or(true)  ? "UNDEFINED"
1067         : unit().modes.editingFlags & signPlus ? "PLUS"
1068                                                : "SUPPRESS";
1069     break;
1070   case HashInquiryKeyword("STREAM"):
1071     str = unit().access == Access::Stream ? "YES" : "NO";
1072     break;
1073   case HashInquiryKeyword("WRITE"):
1074     str = unit().mayWrite() ? "YES" : "NO";
1075     break;
1076   case HashInquiryKeyword("UNFORMATTED"):
1077     str = !unit().isUnformatted ? "UNKNOWN"
1078         : *unit().isUnformatted ? "YES"
1079                                 : "NO";
1080     break;
1081   }
1082   if (str) {
1083     ToFortranDefaultCharacter(result, length, str);
1084     return true;
1085   } else {
1086     BadInquiryKeywordHashCrash(inquiry);
1087     return false;
1088   }
1089 }
1090 
1091 bool InquireUnitState::Inquire(InquiryKeywordHash inquiry, bool &result) {
1092   switch (inquiry) {
1093   case HashInquiryKeyword("EXIST"):
1094     result = true;
1095     return true;
1096   case HashInquiryKeyword("NAMED"):
1097     result = unit().path() != nullptr;
1098     return true;
1099   case HashInquiryKeyword("OPENED"):
1100     result = true;
1101     return true;
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, bool &result) {
1113   switch (inquiry) {
1114   case HashInquiryKeyword("PENDING"):
1115     result = false; // asynchronous I/O is not implemented
1116     return true;
1117   default:
1118     BadInquiryKeywordHashCrash(inquiry);
1119     return false;
1120   }
1121 }
1122 
1123 bool InquireUnitState::Inquire(
1124     InquiryKeywordHash inquiry, std::int64_t &result) {
1125   switch (inquiry) {
1126   case HashInquiryKeyword("NEXTREC"):
1127     if (unit().access == Access::Direct) {
1128       result = unit().currentRecordNumber;
1129     }
1130     return true;
1131   case HashInquiryKeyword("NUMBER"):
1132     result = unit().unitNumber();
1133     return true;
1134   case HashInquiryKeyword("POS"):
1135     result = unit().position();
1136     return true;
1137   case HashInquiryKeyword("RECL"):
1138     if (unit().access == Access::Stream) {
1139       result = -2;
1140     } else if (unit().isFixedRecordLength && unit().recordLength) {
1141       result = *unit().recordLength;
1142     } else {
1143       result = std::numeric_limits<std::uint32_t>::max();
1144     }
1145     return true;
1146   case HashInquiryKeyword("SIZE"):
1147     if (auto size{unit().knownSize()}) {
1148       result = *size;
1149     } else {
1150       result = -1;
1151     }
1152     return true;
1153   default:
1154     BadInquiryKeywordHashCrash(inquiry);
1155     return false;
1156   }
1157 }
1158 
1159 InquireNoUnitState::InquireNoUnitState(const char *sourceFile, int sourceLine)
1160     : NoUnitIoStatementState{sourceFile, sourceLine, *this} {}
1161 
1162 bool InquireNoUnitState::Inquire(
1163     InquiryKeywordHash inquiry, char *result, std::size_t length) {
1164   switch (inquiry) {
1165   case HashInquiryKeyword("ACCESS"):
1166   case HashInquiryKeyword("ACTION"):
1167   case HashInquiryKeyword("ASYNCHRONOUS"):
1168   case HashInquiryKeyword("BLANK"):
1169   case HashInquiryKeyword("CARRIAGECONTROL"):
1170   case HashInquiryKeyword("CONVERT"):
1171   case HashInquiryKeyword("DECIMAL"):
1172   case HashInquiryKeyword("DELIM"):
1173   case HashInquiryKeyword("FORM"):
1174   case HashInquiryKeyword("NAME"):
1175   case HashInquiryKeyword("PAD"):
1176   case HashInquiryKeyword("POSITION"):
1177   case HashInquiryKeyword("ROUND"):
1178   case HashInquiryKeyword("SIGN"):
1179     ToFortranDefaultCharacter(result, length, "UNDEFINED");
1180     return true;
1181   case HashInquiryKeyword("DIRECT"):
1182   case HashInquiryKeyword("ENCODING"):
1183   case HashInquiryKeyword("FORMATTED"):
1184   case HashInquiryKeyword("READ"):
1185   case HashInquiryKeyword("READWRITE"):
1186   case HashInquiryKeyword("SEQUENTIAL"):
1187   case HashInquiryKeyword("STREAM"):
1188   case HashInquiryKeyword("WRITE"):
1189   case HashInquiryKeyword("UNFORMATTED"):
1190     ToFortranDefaultCharacter(result, length, "UNKNONN");
1191     return true;
1192   default:
1193     BadInquiryKeywordHashCrash(inquiry);
1194     return false;
1195   }
1196 }
1197 
1198 bool InquireNoUnitState::Inquire(InquiryKeywordHash inquiry, bool &result) {
1199   switch (inquiry) {
1200   case HashInquiryKeyword("EXIST"):
1201     result = true;
1202     return true;
1203   case HashInquiryKeyword("NAMED"):
1204   case HashInquiryKeyword("OPENED"):
1205   case HashInquiryKeyword("PENDING"):
1206     result = false;
1207     return true;
1208   default:
1209     BadInquiryKeywordHashCrash(inquiry);
1210     return false;
1211   }
1212 }
1213 
1214 bool InquireNoUnitState::Inquire(
1215     InquiryKeywordHash inquiry, std::int64_t, bool &result) {
1216   switch (inquiry) {
1217   case HashInquiryKeyword("PENDING"):
1218     result = false;
1219     return true;
1220   default:
1221     BadInquiryKeywordHashCrash(inquiry);
1222     return false;
1223   }
1224 }
1225 
1226 bool InquireNoUnitState::Inquire(
1227     InquiryKeywordHash inquiry, std::int64_t &result) {
1228   switch (inquiry) {
1229   case HashInquiryKeyword("NEXTREC"):
1230   case HashInquiryKeyword("NUMBER"):
1231   case HashInquiryKeyword("POS"):
1232   case HashInquiryKeyword("RECL"):
1233   case HashInquiryKeyword("SIZE"):
1234     result = -1;
1235     return true;
1236   default:
1237     BadInquiryKeywordHashCrash(inquiry);
1238     return false;
1239   }
1240 }
1241 
1242 InquireUnconnectedFileState::InquireUnconnectedFileState(
1243     OwningPtr<char> &&path, const char *sourceFile, int sourceLine)
1244     : NoUnitIoStatementState{sourceFile, sourceLine, *this}, path_{std::move(
1245                                                                  path)} {}
1246 
1247 bool InquireUnconnectedFileState::Inquire(
1248     InquiryKeywordHash inquiry, char *result, std::size_t length) {
1249   const char *str{nullptr};
1250   switch (inquiry) {
1251   case HashInquiryKeyword("ACCESS"):
1252   case HashInquiryKeyword("ACTION"):
1253   case HashInquiryKeyword("ASYNCHRONOUS"):
1254   case HashInquiryKeyword("BLANK"):
1255   case HashInquiryKeyword("CARRIAGECONTROL"):
1256   case HashInquiryKeyword("CONVERT"):
1257   case HashInquiryKeyword("DECIMAL"):
1258   case HashInquiryKeyword("DELIM"):
1259   case HashInquiryKeyword("FORM"):
1260   case HashInquiryKeyword("PAD"):
1261   case HashInquiryKeyword("POSITION"):
1262   case HashInquiryKeyword("ROUND"):
1263   case HashInquiryKeyword("SIGN"):
1264     str = "UNDEFINED";
1265     break;
1266   case HashInquiryKeyword("DIRECT"):
1267   case HashInquiryKeyword("ENCODING"):
1268   case HashInquiryKeyword("FORMATTED"):
1269   case HashInquiryKeyword("SEQUENTIAL"):
1270   case HashInquiryKeyword("STREAM"):
1271   case HashInquiryKeyword("UNFORMATTED"):
1272     str = "UNKNONN";
1273     break;
1274   case HashInquiryKeyword("READ"):
1275     str = MayRead(path_.get()) ? "YES" : "NO";
1276     break;
1277   case HashInquiryKeyword("READWRITE"):
1278     str = MayReadAndWrite(path_.get()) ? "YES" : "NO";
1279     break;
1280   case HashInquiryKeyword("WRITE"):
1281     str = MayWrite(path_.get()) ? "YES" : "NO";
1282     break;
1283   case HashInquiryKeyword("NAME"):
1284     str = path_.get();
1285     return true;
1286   }
1287   if (str) {
1288     ToFortranDefaultCharacter(result, length, str);
1289     return true;
1290   } else {
1291     BadInquiryKeywordHashCrash(inquiry);
1292     return false;
1293   }
1294 }
1295 
1296 bool InquireUnconnectedFileState::Inquire(
1297     InquiryKeywordHash inquiry, bool &result) {
1298   switch (inquiry) {
1299   case HashInquiryKeyword("EXIST"):
1300     result = IsExtant(path_.get());
1301     return true;
1302   case HashInquiryKeyword("NAMED"):
1303     result = true;
1304     return true;
1305   case HashInquiryKeyword("OPENED"):
1306     result = false;
1307     return true;
1308   case HashInquiryKeyword("PENDING"):
1309     result = false;
1310     return true;
1311   default:
1312     BadInquiryKeywordHashCrash(inquiry);
1313     return false;
1314   }
1315 }
1316 
1317 bool InquireUnconnectedFileState::Inquire(
1318     InquiryKeywordHash inquiry, std::int64_t, bool &result) {
1319   switch (inquiry) {
1320   case HashInquiryKeyword("PENDING"):
1321     result = false;
1322     return true;
1323   default:
1324     BadInquiryKeywordHashCrash(inquiry);
1325     return false;
1326   }
1327 }
1328 
1329 bool InquireUnconnectedFileState::Inquire(
1330     InquiryKeywordHash inquiry, std::int64_t &result) {
1331   switch (inquiry) {
1332   case HashInquiryKeyword("NEXTREC"):
1333   case HashInquiryKeyword("NUMBER"):
1334   case HashInquiryKeyword("POS"):
1335   case HashInquiryKeyword("RECL"):
1336   case HashInquiryKeyword("SIZE"):
1337     result = -1;
1338     return true;
1339   default:
1340     BadInquiryKeywordHashCrash(inquiry);
1341     return false;
1342   }
1343 }
1344 
1345 InquireIOLengthState::InquireIOLengthState(
1346     const char *sourceFile, int sourceLine)
1347     : NoUnitIoStatementState{sourceFile, sourceLine, *this} {}
1348 
1349 bool InquireIOLengthState::Emit(
1350     const char *, std::size_t n, std::size_t elementBytes) {
1351   bytes_ += n * elementBytes;
1352   return true;
1353 }
1354 
1355 bool InquireIOLengthState::Emit(const char *p, std::size_t n) {
1356   bytes_ += sizeof *p * n;
1357   return true;
1358 }
1359 
1360 bool InquireIOLengthState::Emit(const char16_t *p, std::size_t n) {
1361   bytes_ += sizeof *p * n;
1362   return true;
1363 }
1364 
1365 bool InquireIOLengthState::Emit(const char32_t *p, std::size_t n) {
1366   bytes_ += sizeof *p * n;
1367   return true;
1368 }
1369 
1370 } // namespace Fortran::runtime::io
1371