master
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_FSTREAM
11#define _LIBCPP_FSTREAM
12
13/*
14 fstream synopsis
15
16template <class charT, class traits = char_traits<charT> >
17class basic_filebuf
18 : public basic_streambuf<charT, traits>
19{
20public:
21 typedef charT char_type;
22 typedef traits traits_type;
23 typedef typename traits_type::int_type int_type;
24 typedef typename traits_type::pos_type pos_type;
25 typedef typename traits_type::off_type off_type;
26
27 // 27.9.1.2 Constructors/destructor:
28 basic_filebuf();
29 basic_filebuf(basic_filebuf&& rhs);
30 virtual ~basic_filebuf();
31
32 // 27.9.1.3 Assign/swap:
33 basic_filebuf& operator=(basic_filebuf&& rhs);
34 void swap(basic_filebuf& rhs);
35
36 // 27.9.1.4 Members:
37 bool is_open() const;
38 basic_filebuf* open(const char* s, ios_base::openmode mode);
39 basic_filebuf* open(const string& s, ios_base::openmode mode);
40 basic_filebuf* open(const filesystem::path& p, ios_base::openmode mode); // C++17
41 basic_filebuf* close();
42
43protected:
44 // 27.9.1.5 Overridden virtual functions:
45 virtual streamsize showmanyc();
46 virtual int_type underflow();
47 virtual int_type uflow();
48 virtual int_type pbackfail(int_type c = traits_type::eof());
49 virtual int_type overflow (int_type c = traits_type::eof());
50 virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* s, streamsize n);
51 virtual pos_type seekoff(off_type off, ios_base::seekdir way,
52 ios_base::openmode which = ios_base::in | ios_base::out);
53 virtual pos_type seekpos(pos_type sp,
54 ios_base::openmode which = ios_base::in | ios_base::out);
55 virtual int sync();
56 virtual void imbue(const locale& loc);
57};
58
59template <class charT, class traits>
60 void
61 swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
62
63typedef basic_filebuf<char> filebuf;
64typedef basic_filebuf<wchar_t> wfilebuf;
65
66template <class charT, class traits = char_traits<charT> >
67class basic_ifstream
68 : public basic_istream<charT,traits>
69{
70public:
71 typedef charT char_type;
72 typedef traits traits_type;
73 typedef typename traits_type::int_type int_type;
74 typedef typename traits_type::pos_type pos_type;
75 typedef typename traits_type::off_type off_type;
76 using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
77
78 basic_ifstream();
79 explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
80 explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);
81 template<class T>
82 explicit basic_ifstream(const T& s, ios_base::openmode mode = ios_base::in); // Since C++17
83 basic_ifstream(basic_ifstream&& rhs);
84
85 basic_ifstream& operator=(basic_ifstream&& rhs);
86 void swap(basic_ifstream& rhs);
87
88 basic_filebuf<char_type, traits_type>* rdbuf() const;
89 native_handle_type native_handle() const noexcept; // Since C++26
90 bool is_open() const;
91 void open(const char* s, ios_base::openmode mode = ios_base::in);
92 void open(const string& s, ios_base::openmode mode = ios_base::in);
93 void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in); // C++17
94
95 void close();
96};
97
98template <class charT, class traits>
99 void
100 swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
101
102typedef basic_ifstream<char> ifstream;
103typedef basic_ifstream<wchar_t> wifstream;
104
105template <class charT, class traits = char_traits<charT> >
106class basic_ofstream
107 : public basic_ostream<charT,traits>
108{
109public:
110 typedef charT char_type;
111 typedef traits traits_type;
112 typedef typename traits_type::int_type int_type;
113 typedef typename traits_type::pos_type pos_type;
114 typedef typename traits_type::off_type off_type;
115 using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
116
117 basic_ofstream();
118 explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
119 explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
120 template<class T>
121 explicit basic_ofstream(const T& s, ios_base::openmode mode = ios_base::out); // Since C++17
122 basic_ofstream(basic_ofstream&& rhs);
123
124 basic_ofstream& operator=(basic_ofstream&& rhs);
125 void swap(basic_ofstream& rhs);
126
127 basic_filebuf<char_type, traits_type>* rdbuf() const;
128 native_handle_type native_handle() const noexcept; // Since C++26
129
130 bool is_open() const;
131 void open(const char* s, ios_base::openmode mode = ios_base::out);
132 void open(const string& s, ios_base::openmode mode = ios_base::out);
133 void open(const filesystem::path& p,
134 ios_base::openmode mode = ios_base::out); // C++17
135
136 void close();
137};
138
139template <class charT, class traits>
140 void
141 swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
142
143typedef basic_ofstream<char> ofstream;
144typedef basic_ofstream<wchar_t> wofstream;
145
146template <class charT, class traits=char_traits<charT> >
147class basic_fstream
148 : public basic_iostream<charT,traits>
149{
150public:
151 typedef charT char_type;
152 typedef traits traits_type;
153 typedef typename traits_type::int_type int_type;
154 typedef typename traits_type::pos_type pos_type;
155 typedef typename traits_type::off_type off_type;
156 using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
157
158 basic_fstream();
159 explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
160 explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
161 template<class T>
162 explicit basic_fstream(const T& s, ios_base::openmode mode = ios_base::in | ios_base::out); // Since C++17
163 basic_fstream(basic_fstream&& rhs);
164
165 basic_fstream& operator=(basic_fstream&& rhs);
166 void swap(basic_fstream& rhs);
167
168 basic_filebuf<char_type, traits_type>* rdbuf() const;
169 native_handle_type native_handle() const noexcept; // Since C++26
170 bool is_open() const;
171 void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
172 void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
173 void open(const filesystem::path& s,
174 ios_base::openmode mode = ios_base::in|ios_base::out); // C++17
175
176 void close();
177};
178
179template <class charT, class traits>
180 void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
181
182typedef basic_fstream<char> fstream;
183typedef basic_fstream<wchar_t> wfstream;
184
185} // std
186
187*/
188
189#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
190# include <__cxx03/fstream>
191#else
192# include <__config>
193
194# if _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
195
196# include <__algorithm/max.h>
197# include <__assert>
198# include <__filesystem/path.h>
199# include <__fwd/fstream.h>
200# include <__locale>
201# include <__memory/addressof.h>
202# include <__memory/unique_ptr.h>
203# include <__ostream/basic_ostream.h>
204# include <__type_traits/enable_if.h>
205# include <__type_traits/is_same.h>
206# include <__utility/move.h>
207# include <__utility/swap.h>
208# include <__utility/unreachable.h>
209# include <cstdio>
210# include <istream>
211# include <streambuf>
212# include <typeinfo>
213# include <version>
214
215# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
216# pragma GCC system_header
217# endif
218
219_LIBCPP_PUSH_MACROS
220# include <__undef_macros>
221
222_LIBCPP_BEGIN_NAMESPACE_STD
223
224# if _LIBCPP_STD_VER >= 26 && defined(_LIBCPP_WIN32API)
225_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept;
226# endif
227
228template <class _CharT, class _Traits>
229class basic_filebuf : public basic_streambuf<_CharT, _Traits> {
230public:
231 typedef _CharT char_type;
232 typedef _Traits traits_type;
233 typedef typename traits_type::int_type int_type;
234 typedef typename traits_type::pos_type pos_type;
235 typedef typename traits_type::off_type off_type;
236 typedef typename traits_type::state_type state_type;
237# if _LIBCPP_STD_VER >= 26
238# if defined(_LIBCPP_WIN32API)
239 using native_handle_type = void*; // HANDLE
240# elif __has_include(<unistd.h>)
241 using native_handle_type = int; // POSIX file descriptor
242# else
243# error "Provide a native file handle!"
244# endif
245# endif
246
247 // 27.9.1.2 Constructors/destructor:
248 basic_filebuf();
249 basic_filebuf(basic_filebuf&& __rhs);
250 ~basic_filebuf() override;
251
252 // 27.9.1.3 Assign/swap:
253 _LIBCPP_HIDE_FROM_ABI basic_filebuf& operator=(basic_filebuf&& __rhs);
254 void swap(basic_filebuf& __rhs);
255
256 // 27.9.1.4 Members:
257 _LIBCPP_HIDE_FROM_ABI bool is_open() const;
258 basic_filebuf* open(const char* __s, ios_base::openmode __mode);
259# if _LIBCPP_HAS_OPEN_WITH_WCHAR
260 basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode);
261# endif
262 _LIBCPP_HIDE_FROM_ABI basic_filebuf* open(const string& __s, ios_base::openmode __mode);
263
264# if _LIBCPP_STD_VER >= 17
265 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI basic_filebuf*
266 open(const filesystem::path& __p, ios_base::openmode __mode) {
267 return open(__p.c_str(), __mode);
268 }
269# endif
270 _LIBCPP_HIDE_FROM_ABI basic_filebuf* __open(int __fd, ios_base::openmode __mode);
271 basic_filebuf* close();
272# if _LIBCPP_STD_VER >= 26
273 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
274 _LIBCPP_ASSERT_UNCATEGORIZED(this->is_open(), "File must be opened");
275# if defined(_LIBCPP_WIN32API)
276 return std::__filebuf_windows_native_handle(__file_);
277# elif __has_include(<unistd.h>)
278 return fileno(__file_);
279# else
280# error "Provide a way to determine the file native handle!"
281# endif
282 }
283# endif // _LIBCPP_STD_VER >= 26
284
285 _LIBCPP_HIDE_FROM_ABI inline static const char* __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
286# if _LIBCPP_HAS_OPEN_WITH_WCHAR
287 _LIBCPP_HIDE_FROM_ABI inline static const wchar_t* __make_mdwstring(ios_base::openmode __mode) _NOEXCEPT;
288# endif
289
290protected:
291 // 27.9.1.5 Overridden virtual functions:
292 int_type underflow() override;
293 int_type pbackfail(int_type __c = traits_type::eof()) override;
294 int_type overflow(int_type __c = traits_type::eof()) override;
295 basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n) override;
296 pos_type
297 seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __wch = ios_base::in | ios_base::out) override;
298 pos_type seekpos(pos_type __sp, ios_base::openmode __wch = ios_base::in | ios_base::out) override;
299 int sync() override;
300 void imbue(const locale& __loc) override;
301
302private:
303 char* __extbuf_;
304 const char* __extbufnext_;
305 const char* __extbufend_;
306 char __extbuf_min_[8];
307 size_t __ebs_;
308 char_type* __intbuf_;
309 size_t __ibs_;
310 FILE* __file_;
311 const codecvt<char_type, char, state_type>* __cv_;
312 state_type __st_;
313 state_type __st_last_;
314 ios_base::openmode __om_;
315 // There have been no file operations yet, which allows setting unbuffered
316 // I/O mode.
317 static const ios_base::openmode __no_io_operations = ios_base::trunc;
318 // Unbuffered I/O mode has been requested.
319 static const ios_base::openmode __use_unbuffered_io = ios_base::ate;
320 // Used to track the currently used mode and track whether the output should
321 // be unbuffered.
322 // [filebuf.virtuals]/12
323 // If setbuf(0, 0) is called on a stream before any I/O has occurred on
324 // that stream, the stream becomes unbuffered. Otherwise the results are
325 // implementation-defined.
326 // This allows calling setbuf(0, 0)
327 // - before opening a file,
328 // - after opening a file, before
329 // - a read
330 // - a write
331 // - a seek.
332 // Note that opening a file with ios_base::ate does a seek operation.
333 // Normally underflow, overflow, and sync change this flag to ios_base::in,
334 // ios_base_out, or 0.
335 //
336 // The ios_base::trunc and ios_base::ate flags are not used in __cm_. They
337 // are used to track the state of the unbuffered request. For readability
338 // they have the aliases __no_io_operations and __use_unbuffered_io
339 // respectively.
340 //
341 // The __no_io_operations and __use_unbuffered_io flags are used in the
342 // following way:
343 // - __no_io_operations is set upon construction to indicate the unbuffered
344 // state can be set.
345 // - When requesting unbuffered output:
346 // - If the file is open it sets the mode.
347 // - Else places a request by adding the __use_unbuffered_io flag.
348 // - When a file is opened it checks whether both __no_io_operations and
349 // __use_unbuffered_io are set. If so switches to unbuffered mode.
350 // - All file I/O operations change the mode effectively clearing the
351 // __no_io_operations and __use_unbuffered_io flags.
352 ios_base::openmode __cm_;
353 bool __owns_eb_;
354 bool __owns_ib_;
355 bool __always_noconv_;
356
357 bool __read_mode();
358 void __write_mode();
359
360 _LIBCPP_HIDE_FROM_ABI static int __fseek(FILE* __file, pos_type __offset, int __whence);
361 _LIBCPP_HIDE_FROM_ABI static pos_type __ftell(FILE* __file);
362
363 _LIBCPP_EXPORTED_FROM_ABI friend FILE* __get_ostream_file(ostream&);
364
365 // There are multiple (__)open function, they use different C-API open
366 // function. After that call these functions behave the same. This function
367 // does that part and determines the final return value.
368 _LIBCPP_HIDE_FROM_ABI basic_filebuf* __do_open(FILE* __file, ios_base::openmode __mode) {
369 __file_ = __file;
370 if (!__file_)
371 return nullptr;
372
373 __om_ = __mode;
374 if (__cm_ == (__no_io_operations | __use_unbuffered_io)) {
375 std::setbuf(__file_, nullptr);
376 __cm_ = 0;
377 }
378
379 if (__mode & ios_base::ate) {
380 __cm_ = 0;
381 if (fseek(__file_, 0, SEEK_END)) {
382 fclose(__file_);
383 __file_ = nullptr;
384 return nullptr;
385 }
386 }
387
388 return this;
389 }
390
391 // If the file is already open, switch to unbuffered mode. Otherwise, record
392 // the request to use unbuffered mode so that we use that mode when we
393 // eventually open the file.
394 _LIBCPP_HIDE_FROM_ABI void __request_unbuffered_mode(char_type* __s, streamsize __n) {
395 if (__cm_ == __no_io_operations && __s == nullptr && __n == 0) {
396 if (__file_) {
397 std::setbuf(__file_, nullptr);
398 __cm_ = 0;
399 } else {
400 __cm_ = __no_io_operations | __use_unbuffered_io;
401 }
402 }
403 }
404};
405
406template <class _CharT, class _Traits>
407basic_filebuf<_CharT, _Traits>::basic_filebuf()
408 : __extbuf_(nullptr),
409 __extbufnext_(nullptr),
410 __extbufend_(nullptr),
411 __ebs_(0),
412 __intbuf_(nullptr),
413 __ibs_(0),
414 __file_(nullptr),
415 __cv_(nullptr),
416 __st_(),
417 __st_last_(),
418 __om_(0),
419 __cm_(__no_io_operations),
420 __owns_eb_(false),
421 __owns_ib_(false),
422 __always_noconv_(false) {
423 if (std::has_facet<codecvt<char_type, char, state_type> >(this->getloc())) {
424 __cv_ = std::addressof(std::use_facet<codecvt<char_type, char, state_type> >(this->getloc()));
425 __always_noconv_ = __cv_->always_noconv();
426 }
427 setbuf(nullptr, 4096);
428}
429
430template <class _CharT, class _Traits>
431basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs) : basic_streambuf<_CharT, _Traits>(__rhs) {
432 if (__rhs.__extbuf_ == __rhs.__extbuf_min_) {
433 __extbuf_ = __extbuf_min_;
434 __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
435 __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
436 } else {
437 __extbuf_ = __rhs.__extbuf_;
438 __extbufnext_ = __rhs.__extbufnext_;
439 __extbufend_ = __rhs.__extbufend_;
440 }
441 __ebs_ = __rhs.__ebs_;
442 __intbuf_ = __rhs.__intbuf_;
443 __ibs_ = __rhs.__ibs_;
444 __file_ = __rhs.__file_;
445 __cv_ = __rhs.__cv_;
446 __st_ = __rhs.__st_;
447 __st_last_ = __rhs.__st_last_;
448 __om_ = __rhs.__om_;
449 __cm_ = __rhs.__cm_;
450 __owns_eb_ = __rhs.__owns_eb_;
451 __owns_ib_ = __rhs.__owns_ib_;
452 __always_noconv_ = __rhs.__always_noconv_;
453 if (__rhs.pbase()) {
454 if (__rhs.pbase() == __rhs.__intbuf_)
455 this->setp(__intbuf_, __intbuf_ + (__rhs.epptr() - __rhs.pbase()));
456 else
457 this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__rhs.epptr() - __rhs.pbase()));
458 this->__pbump(__rhs.pptr() - __rhs.pbase());
459 } else if (__rhs.eback()) {
460 if (__rhs.eback() == __rhs.__intbuf_)
461 this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()), __intbuf_ + (__rhs.egptr() - __rhs.eback()));
462 else
463 this->setg((char_type*)__extbuf_,
464 (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
465 (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
466 }
467 __rhs.__extbuf_ = nullptr;
468 __rhs.__extbufnext_ = nullptr;
469 __rhs.__extbufend_ = nullptr;
470 __rhs.__ebs_ = 0;
471 __rhs.__intbuf_ = 0;
472 __rhs.__ibs_ = 0;
473 __rhs.__file_ = nullptr;
474 __rhs.__st_ = state_type();
475 __rhs.__st_last_ = state_type();
476 __rhs.__om_ = 0;
477 __rhs.__cm_ = 0;
478 __rhs.__owns_eb_ = false;
479 __rhs.__owns_ib_ = false;
480 __rhs.setg(0, 0, 0);
481 __rhs.setp(0, 0);
482}
483
484template <class _CharT, class _Traits>
485inline basic_filebuf<_CharT, _Traits>& basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs) {
486 close();
487 swap(__rhs);
488 return *this;
489}
490
491template <class _CharT, class _Traits>
492basic_filebuf<_CharT, _Traits>::~basic_filebuf() {
493# if _LIBCPP_HAS_EXCEPTIONS
494 try {
495# endif // _LIBCPP_HAS_EXCEPTIONS
496 close();
497# if _LIBCPP_HAS_EXCEPTIONS
498 } catch (...) {
499 }
500# endif // _LIBCPP_HAS_EXCEPTIONS
501 if (__owns_eb_)
502 delete[] __extbuf_;
503 if (__owns_ib_)
504 delete[] __intbuf_;
505}
506
507template <class _CharT, class _Traits>
508void basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs) {
509 basic_streambuf<char_type, traits_type>::swap(__rhs);
510 if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) {
511 // Neither *this nor __rhs uses the small buffer, so we can simply swap the pointers.
512 std::swap(__extbuf_, __rhs.__extbuf_);
513 std::swap(__extbufnext_, __rhs.__extbufnext_);
514 std::swap(__extbufend_, __rhs.__extbufend_);
515 } else {
516 ptrdiff_t __ln = __extbufnext_ ? __extbufnext_ - __extbuf_ : 0;
517 ptrdiff_t __le = __extbufend_ ? __extbufend_ - __extbuf_ : 0;
518 ptrdiff_t __rn = __rhs.__extbufnext_ ? __rhs.__extbufnext_ - __rhs.__extbuf_ : 0;
519 ptrdiff_t __re = __rhs.__extbufend_ ? __rhs.__extbufend_ - __rhs.__extbuf_ : 0;
520 if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) {
521 // *this uses the small buffer, but __rhs doesn't.
522 __extbuf_ = __rhs.__extbuf_;
523 __rhs.__extbuf_ = __rhs.__extbuf_min_;
524 std::memmove(__rhs.__extbuf_min_, __extbuf_min_, sizeof(__extbuf_min_));
525 } else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_) {
526 // *this doesn't use the small buffer, but __rhs does.
527 __rhs.__extbuf_ = __extbuf_;
528 __extbuf_ = __extbuf_min_;
529 std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_));
530 } else {
531 // Both *this and __rhs use the small buffer.
532 char __tmp[sizeof(__extbuf_min_)];
533 std::memmove(__tmp, __extbuf_min_, sizeof(__extbuf_min_));
534 std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_));
535 std::memmove(__rhs.__extbuf_min_, __tmp, sizeof(__extbuf_min_));
536 }
537 __extbufnext_ = __extbuf_ + __rn;
538 __extbufend_ = __extbuf_ + __re;
539 __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
540 __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
541 }
542 std::swap(__ebs_, __rhs.__ebs_);
543 std::swap(__intbuf_, __rhs.__intbuf_);
544 std::swap(__ibs_, __rhs.__ibs_);
545 std::swap(__file_, __rhs.__file_);
546 std::swap(__cv_, __rhs.__cv_);
547 std::swap(__st_, __rhs.__st_);
548 std::swap(__st_last_, __rhs.__st_last_);
549 std::swap(__om_, __rhs.__om_);
550 std::swap(__cm_, __rhs.__cm_);
551 std::swap(__owns_eb_, __rhs.__owns_eb_);
552 std::swap(__owns_ib_, __rhs.__owns_ib_);
553 std::swap(__always_noconv_, __rhs.__always_noconv_);
554 if (this->eback() == (char_type*)__rhs.__extbuf_min_) {
555 ptrdiff_t __n = this->gptr() - this->eback();
556 ptrdiff_t __e = this->egptr() - this->eback();
557 this->setg((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __n, (char_type*)__extbuf_min_ + __e);
558 } else if (this->pbase() == (char_type*)__rhs.__extbuf_min_) {
559 ptrdiff_t __n = this->pptr() - this->pbase();
560 ptrdiff_t __e = this->epptr() - this->pbase();
561 this->setp((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __e);
562 this->__pbump(__n);
563 }
564 if (__rhs.eback() == (char_type*)__extbuf_min_) {
565 ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
566 ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
567 __rhs.setg(
568 (char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __n, (char_type*)__rhs.__extbuf_min_ + __e);
569 } else if (__rhs.pbase() == (char_type*)__extbuf_min_) {
570 ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
571 ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
572 __rhs.setp((char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __e);
573 __rhs.__pbump(__n);
574 }
575}
576
577template <class _CharT, class _Traits>
578inline _LIBCPP_HIDE_FROM_ABI void swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y) {
579 __x.swap(__y);
580}
581
582template <class _CharT, class _Traits>
583inline bool basic_filebuf<_CharT, _Traits>::is_open() const {
584 return __file_ != nullptr;
585}
586
587template <class _CharT, class _Traits>
588const char* basic_filebuf<_CharT, _Traits>::__make_mdstring(ios_base::openmode __mode) _NOEXCEPT {
589 switch (__mode & ~ios_base::ate) {
590 case ios_base::out:
591 case ios_base::out | ios_base::trunc:
592 return "w" _LIBCPP_FOPEN_CLOEXEC_MODE;
593 case ios_base::out | ios_base::app:
594 case ios_base::app:
595 return "a" _LIBCPP_FOPEN_CLOEXEC_MODE;
596 case ios_base::in:
597 return "r" _LIBCPP_FOPEN_CLOEXEC_MODE;
598 case ios_base::in | ios_base::out:
599 return "r+" _LIBCPP_FOPEN_CLOEXEC_MODE;
600 case ios_base::in | ios_base::out | ios_base::trunc:
601 return "w+" _LIBCPP_FOPEN_CLOEXEC_MODE;
602 case ios_base::in | ios_base::out | ios_base::app:
603 case ios_base::in | ios_base::app:
604 return "a+" _LIBCPP_FOPEN_CLOEXEC_MODE;
605 case ios_base::out | ios_base::binary:
606 case ios_base::out | ios_base::trunc | ios_base::binary:
607 return "wb" _LIBCPP_FOPEN_CLOEXEC_MODE;
608 case ios_base::out | ios_base::app | ios_base::binary:
609 case ios_base::app | ios_base::binary:
610 return "ab" _LIBCPP_FOPEN_CLOEXEC_MODE;
611 case ios_base::in | ios_base::binary:
612 return "rb" _LIBCPP_FOPEN_CLOEXEC_MODE;
613 case ios_base::in | ios_base::out | ios_base::binary:
614 return "r+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
615 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
616 return "w+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
617 case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
618 case ios_base::in | ios_base::app | ios_base::binary:
619 return "a+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
620# if _LIBCPP_STD_VER >= 23
621 case ios_base::out | ios_base::noreplace:
622 case ios_base::out | ios_base::trunc | ios_base::noreplace:
623 return "wx" _LIBCPP_FOPEN_CLOEXEC_MODE;
624 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace:
625 return "w+x" _LIBCPP_FOPEN_CLOEXEC_MODE;
626 case ios_base::out | ios_base::binary | ios_base::noreplace:
627 case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
628 return "wbx" _LIBCPP_FOPEN_CLOEXEC_MODE;
629 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
630 return "w+bx" _LIBCPP_FOPEN_CLOEXEC_MODE;
631# endif // _LIBCPP_STD_VER >= 23
632 default:
633 return nullptr;
634 }
635 __libcpp_unreachable();
636}
637
638# if _LIBCPP_HAS_OPEN_WITH_WCHAR
639template <class _CharT, class _Traits>
640const wchar_t* basic_filebuf<_CharT, _Traits>::__make_mdwstring(ios_base::openmode __mode) _NOEXCEPT {
641 switch (__mode & ~ios_base::ate) {
642 case ios_base::out:
643 case ios_base::out | ios_base::trunc:
644 return L"w";
645 case ios_base::out | ios_base::app:
646 case ios_base::app:
647 return L"a";
648 case ios_base::in:
649 return L"r";
650 case ios_base::in | ios_base::out:
651 return L"r+";
652 case ios_base::in | ios_base::out | ios_base::trunc:
653 return L"w+";
654 case ios_base::in | ios_base::out | ios_base::app:
655 case ios_base::in | ios_base::app:
656 return L"a+";
657 case ios_base::out | ios_base::binary:
658 case ios_base::out | ios_base::trunc | ios_base::binary:
659 return L"wb";
660 case ios_base::out | ios_base::app | ios_base::binary:
661 case ios_base::app | ios_base::binary:
662 return L"ab";
663 case ios_base::in | ios_base::binary:
664 return L"rb";
665 case ios_base::in | ios_base::out | ios_base::binary:
666 return L"r+b";
667 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
668 return L"w+b";
669 case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
670 case ios_base::in | ios_base::app | ios_base::binary:
671 return L"a+b";
672# if _LIBCPP_STD_VER >= 23
673 case ios_base::out | ios_base::noreplace:
674 case ios_base::out | ios_base::trunc | ios_base::noreplace:
675 return L"wx";
676 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace:
677 return L"w+x";
678 case ios_base::out | ios_base::binary | ios_base::noreplace:
679 case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
680 return L"wbx";
681 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
682 return L"w+bx";
683# endif // _LIBCPP_STD_VER >= 23
684 default:
685 return nullptr;
686 }
687 __libcpp_unreachable();
688}
689# endif
690
691template <class _CharT, class _Traits>
692basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
693 if (__file_)
694 return nullptr;
695 const char* __mdstr = __make_mdstring(__mode);
696 if (!__mdstr)
697 return nullptr;
698
699 return __do_open(std::fopen(__s, __mdstr), __mode);
700}
701
702template <class _CharT, class _Traits>
703inline basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
704 if (__file_)
705 return nullptr;
706 const char* __mdstr = __make_mdstring(__mode);
707 if (!__mdstr)
708 return nullptr;
709
710 return __do_open(fdopen(__fd, __mdstr), __mode);
711}
712
713# if _LIBCPP_HAS_OPEN_WITH_WCHAR
714// This is basically the same as the char* overload except that it uses _wfopen
715// and long mode strings.
716template <class _CharT, class _Traits>
717basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
718 if (__file_)
719 return nullptr;
720 const wchar_t* __mdstr = __make_mdwstring(__mode);
721 if (!__mdstr)
722 return nullptr;
723
724 return __do_open(_wfopen(__s, __mdstr), __mode);
725}
726# endif
727
728template <class _CharT, class _Traits>
729inline basic_filebuf<_CharT, _Traits>*
730basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
731 return open(__s.c_str(), __mode);
732}
733
734template <class _CharT, class _Traits>
735basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::close() {
736 basic_filebuf<_CharT, _Traits>* __rt = nullptr;
737 if (__file_) {
738 __rt = this;
739 unique_ptr<FILE, int (*)(FILE*)> __h(__file_, fclose);
740 if (sync())
741 __rt = nullptr;
742 if (fclose(__h.release()))
743 __rt = nullptr;
744 __file_ = nullptr;
745 setbuf(0, 0);
746 }
747 return __rt;
748}
749
750template <class _CharT, class _Traits>
751typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::underflow() {
752 if (__file_ == nullptr)
753 return traits_type::eof();
754 bool __initial = __read_mode();
755 char_type __1buf;
756 if (this->gptr() == nullptr)
757 this->setg(std::addressof(__1buf), std::addressof(__1buf) + 1, std::addressof(__1buf) + 1);
758 const size_t __unget_sz = __initial ? 0 : std::min<size_t>((this->egptr() - this->eback()) / 2, 4);
759 int_type __c = traits_type::eof();
760 if (this->gptr() == this->egptr()) {
761 std::memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
762 if (__always_noconv_) {
763 size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
764 __nmemb = std::fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
765 if (__nmemb != 0) {
766 this->setg(this->eback(), this->eback() + __unget_sz, this->eback() + __unget_sz + __nmemb);
767 __c = traits_type::to_int_type(*this->gptr());
768 }
769 } else {
770 if (__extbufend_ != __extbufnext_) {
771 _LIBCPP_ASSERT_NON_NULL(__extbufnext_ != nullptr, "underflow moving from nullptr");
772 _LIBCPP_ASSERT_NON_NULL(__extbuf_ != nullptr, "underflow moving into nullptr");
773 std::memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
774 }
775 __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
776 __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
777 size_t __nmemb =
778 std::min(static_cast<size_t>(__ibs_ - __unget_sz), static_cast<size_t>(__extbufend_ - __extbufnext_));
779 codecvt_base::result __r;
780 __st_last_ = __st_;
781 size_t __nr = std::fread((void*)const_cast<char*>(__extbufnext_), 1, __nmemb, __file_);
782 if (__nr != 0) {
783 if (!__cv_)
784 std::__throw_bad_cast();
785
786 __extbufend_ = __extbufnext_ + __nr;
787 char_type* __inext;
788 __r = __cv_->in(
789 __st_, __extbuf_, __extbufend_, __extbufnext_, this->eback() + __unget_sz, this->eback() + __ibs_, __inext);
790 if (__r == codecvt_base::noconv) {
791 this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)const_cast<char*>(__extbufend_));
792 __c = traits_type::to_int_type(*this->gptr());
793 } else if (__inext != this->eback() + __unget_sz) {
794 this->setg(this->eback(), this->eback() + __unget_sz, __inext);
795 __c = traits_type::to_int_type(*this->gptr());
796 }
797 }
798 }
799 } else
800 __c = traits_type::to_int_type(*this->gptr());
801 if (this->eback() == std::addressof(__1buf))
802 this->setg(nullptr, nullptr, nullptr);
803 return __c;
804}
805
806template <class _CharT, class _Traits>
807typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c) {
808 if (__file_ && this->eback() < this->gptr()) {
809 if (traits_type::eq_int_type(__c, traits_type::eof())) {
810 this->gbump(-1);
811 return traits_type::not_eof(__c);
812 }
813 if ((__om_ & ios_base::out) || traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])) {
814 this->gbump(-1);
815 *this->gptr() = traits_type::to_char_type(__c);
816 return __c;
817 }
818 }
819 return traits_type::eof();
820}
821
822template <class _CharT, class _Traits>
823typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::overflow(int_type __c) {
824 auto __failed = [this]() {
825 if (this->pptr() == this->epptr() + 1) {
826 this->pbump(-1); // lose the character we overflowed above -- we don't really have a
827 // choice since we couldn't commit the contents of the put area
828 }
829 return traits_type::eof();
830 };
831
832 if (__file_ == nullptr)
833 return traits_type::eof();
834 __write_mode();
835 char_type __1buf;
836 char_type* __pb_save = this->pbase();
837 char_type* __epb_save = this->epptr();
838 if (!traits_type::eq_int_type(__c, traits_type::eof())) {
839 if (this->pptr() == nullptr)
840 this->setp(std::addressof(__1buf), std::addressof(__1buf) + 1);
841 *this->pptr() = traits_type::to_char_type(__c);
842 this->pbump(1);
843 }
844
845 // There is nothing to write, early return
846 if (this->pptr() == this->pbase()) {
847 return traits_type::not_eof(__c);
848 }
849
850 if (__always_noconv_) {
851 size_t __n = static_cast<size_t>(this->pptr() - this->pbase());
852 if (std::fwrite(this->pbase(), sizeof(char_type), __n, __file_) != __n) {
853 return __failed();
854 }
855 } else {
856 if (!__cv_)
857 std::__throw_bad_cast();
858
859 // See [filebuf.virtuals]
860 char_type* __b = this->pbase();
861 char_type* __p = this->pptr();
862 const char_type* __end;
863 char* __extbuf_end = __extbuf_;
864 do {
865 codecvt_base::result __r = __cv_->out(__st_, __b, __p, __end, __extbuf_, __extbuf_ + __ebs_, __extbuf_end);
866 if (__end == __b) {
867 return __failed();
868 }
869
870 // No conversion needed: output characters directly to the file, done.
871 if (__r == codecvt_base::noconv) {
872 size_t __n = static_cast<size_t>(__p - __b);
873 if (std::fwrite(__b, 1, __n, __file_) != __n) {
874 return __failed();
875 }
876 break;
877
878 // Conversion successful: output the converted characters to the file, done.
879 } else if (__r == codecvt_base::ok) {
880 size_t __n = static_cast<size_t>(__extbuf_end - __extbuf_);
881 if (std::fwrite(__extbuf_, 1, __n, __file_) != __n) {
882 return __failed();
883 }
884 break;
885
886 // Conversion partially successful: output converted characters to the file and repeat with the
887 // remaining characters.
888 } else if (__r == codecvt_base::partial) {
889 size_t __n = static_cast<size_t>(__extbuf_end - __extbuf_);
890 if (std::fwrite(__extbuf_, 1, __n, __file_) != __n) {
891 return __failed();
892 }
893 __b = const_cast<char_type*>(__end);
894 continue;
895
896 } else {
897 return __failed();
898 }
899 } while (true);
900 }
901 this->setp(__pb_save, __epb_save);
902 return traits_type::not_eof(__c);
903}
904
905template <class _CharT, class _Traits>
906basic_streambuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n) {
907 this->setg(nullptr, nullptr, nullptr);
908 this->setp(nullptr, nullptr);
909 __request_unbuffered_mode(__s, __n);
910 if (__owns_eb_)
911 delete[] __extbuf_;
912 if (__owns_ib_)
913 delete[] __intbuf_;
914 __ebs_ = __n;
915 if (__ebs_ > sizeof(__extbuf_min_)) {
916 if (__always_noconv_ && __s) {
917 __extbuf_ = (char*)__s;
918 __owns_eb_ = false;
919 } else {
920 __extbuf_ = new char[__ebs_];
921 __owns_eb_ = true;
922 }
923 } else {
924 __extbuf_ = __extbuf_min_;
925 __ebs_ = sizeof(__extbuf_min_);
926 __owns_eb_ = false;
927 }
928 if (!__always_noconv_) {
929 __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
930 if (__s && __ibs_ > sizeof(__extbuf_min_)) {
931 __intbuf_ = __s;
932 __owns_ib_ = false;
933 } else {
934 __intbuf_ = new char_type[__ibs_];
935 __owns_ib_ = true;
936 }
937 } else {
938 __ibs_ = 0;
939 __intbuf_ = nullptr;
940 __owns_ib_ = false;
941 }
942 return this;
943}
944
945template <class _CharT, class _Traits>
946typename basic_filebuf<_CharT, _Traits>::pos_type
947basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode) {
948 if (!__cv_)
949 std::__throw_bad_cast();
950
951 int __width = __cv_->encoding();
952 if (__file_ == nullptr || (__width <= 0 && __off != 0) || sync())
953 return pos_type(off_type(-1));
954 // __width > 0 || __off == 0
955 int __whence;
956 switch (__way) {
957 case ios_base::beg:
958 __whence = SEEK_SET;
959 break;
960 case ios_base::cur:
961 __whence = SEEK_CUR;
962 break;
963 case ios_base::end:
964 __whence = SEEK_END;
965 break;
966 default:
967 return pos_type(off_type(-1));
968 }
969 if (__fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
970 return pos_type(off_type(-1));
971 pos_type __r = __ftell(__file_);
972 __r.state(__st_);
973 return __r;
974}
975
976template <class _CharT, class _Traits>
977int basic_filebuf<_CharT, _Traits>::__fseek(FILE* __file, pos_type __offset, int __whence) {
978# if defined(_LIBCPP_MSVCRT_LIKE)
979 return _fseeki64(__file, __offset, __whence);
980# elif defined(_NEWLIB_VERSION)
981 return fseek(__file, __offset, __whence);
982# else
983 return ::fseeko(__file, __offset, __whence);
984# endif
985}
986
987template <class _CharT, class _Traits>
988typename basic_filebuf<_CharT, _Traits>::pos_type basic_filebuf<_CharT, _Traits>::__ftell(FILE* __file) {
989# if defined(_LIBCPP_MSVCRT_LIKE)
990 return _ftelli64(__file);
991# elif defined(_NEWLIB_VERSION)
992 return ftell(__file);
993# else
994 return ftello(__file);
995# endif
996}
997
998template <class _CharT, class _Traits>
999typename basic_filebuf<_CharT, _Traits>::pos_type
1000basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode) {
1001 if (__file_ == nullptr || sync())
1002 return pos_type(off_type(-1));
1003 if (__fseek(__file_, __sp, SEEK_SET))
1004 return pos_type(off_type(-1));
1005 __st_ = __sp.state();
1006 return __sp;
1007}
1008
1009template <class _CharT, class _Traits>
1010int basic_filebuf<_CharT, _Traits>::sync() {
1011 if (__file_ == nullptr)
1012 return 0;
1013 if (!__cv_)
1014 std::__throw_bad_cast();
1015
1016 if (__cm_ & ios_base::out) {
1017 if (this->pptr() != this->pbase())
1018 if (overflow() == traits_type::eof())
1019 return -1;
1020 codecvt_base::result __r;
1021 do {
1022 char* __extbe;
1023 __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
1024 size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
1025 if (std::fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
1026 return -1;
1027 } while (__r == codecvt_base::partial);
1028 if (__r == codecvt_base::error)
1029 return -1;
1030 if (std::fflush(__file_))
1031 return -1;
1032 } else if (__cm_ & ios_base::in) {
1033 off_type __c;
1034 state_type __state = __st_last_;
1035 bool __update_st = false;
1036 if (__always_noconv_)
1037 __c = this->egptr() - this->gptr();
1038 else {
1039 int __width = __cv_->encoding();
1040 __c = __extbufend_ - __extbufnext_;
1041 if (__width > 0)
1042 __c += __width * (this->egptr() - this->gptr());
1043 else {
1044 if (this->gptr() != this->egptr()) {
1045 const int __off = __cv_->length(__state, __extbuf_, __extbufnext_, this->gptr() - this->eback());
1046 __c += __extbufnext_ - __extbuf_ - __off;
1047 __update_st = true;
1048 }
1049 }
1050 }
1051 if (__fseek(__file_, -__c, SEEK_CUR))
1052 return -1;
1053 if (__update_st)
1054 __st_ = __state;
1055 __extbufnext_ = __extbufend_ = __extbuf_;
1056 this->setg(nullptr, nullptr, nullptr);
1057 __cm_ = 0;
1058 }
1059 return 0;
1060}
1061
1062template <class _CharT, class _Traits>
1063void basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc) {
1064 sync();
1065 __cv_ = std::addressof(std::use_facet<codecvt<char_type, char, state_type> >(__loc));
1066 bool __old_anc = __always_noconv_;
1067 __always_noconv_ = __cv_->always_noconv();
1068 if (__old_anc != __always_noconv_) {
1069 this->setg(nullptr, nullptr, nullptr);
1070 this->setp(nullptr, nullptr);
1071 // invariant, char_type is char, else we couldn't get here
1072 if (__always_noconv_) // need to dump __intbuf_
1073 {
1074 if (__owns_eb_)
1075 delete[] __extbuf_;
1076 __owns_eb_ = __owns_ib_;
1077 __ebs_ = __ibs_;
1078 __extbuf_ = (char*)__intbuf_;
1079 __ibs_ = 0;
1080 __intbuf_ = nullptr;
1081 __owns_ib_ = false;
1082 } else // need to obtain an __intbuf_.
1083 { // If __extbuf_ is user-supplied, use it, else new __intbuf_
1084 if (!__owns_eb_ && __extbuf_ != __extbuf_min_) {
1085 __ibs_ = __ebs_;
1086 __intbuf_ = (char_type*)__extbuf_;
1087 __owns_ib_ = false;
1088 __extbuf_ = new char[__ebs_];
1089 __owns_eb_ = true;
1090 } else {
1091 __ibs_ = __ebs_;
1092 __intbuf_ = new char_type[__ibs_];
1093 __owns_ib_ = true;
1094 }
1095 }
1096 }
1097}
1098
1099template <class _CharT, class _Traits>
1100bool basic_filebuf<_CharT, _Traits>::__read_mode() {
1101 if (!(__cm_ & ios_base::in)) {
1102 this->setp(nullptr, nullptr);
1103 if (__always_noconv_)
1104 this->setg((char_type*)__extbuf_, (char_type*)__extbuf_ + __ebs_, (char_type*)__extbuf_ + __ebs_);
1105 else
1106 this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
1107 __cm_ = ios_base::in;
1108 return true;
1109 }
1110 return false;
1111}
1112
1113template <class _CharT, class _Traits>
1114void basic_filebuf<_CharT, _Traits>::__write_mode() {
1115 if (!(__cm_ & ios_base::out)) {
1116 this->setg(nullptr, nullptr, nullptr);
1117 if (__ebs_ > sizeof(__extbuf_min_)) {
1118 if (__always_noconv_)
1119 this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__ebs_ - 1));
1120 else
1121 this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
1122 } else
1123 this->setp(nullptr, nullptr);
1124 __cm_ = ios_base::out;
1125 }
1126}
1127
1128// basic_ifstream
1129
1130template <class _CharT, class _Traits>
1131class basic_ifstream : public basic_istream<_CharT, _Traits> {
1132public:
1133 typedef _CharT char_type;
1134 typedef _Traits traits_type;
1135 typedef typename traits_type::int_type int_type;
1136 typedef typename traits_type::pos_type pos_type;
1137 typedef typename traits_type::off_type off_type;
1138# if _LIBCPP_STD_VER >= 26
1139 using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
1140# endif
1141
1142 _LIBCPP_HIDE_FROM_ABI basic_ifstream();
1143 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1144# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1145 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1146# endif
1147 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1148# if _LIBCPP_STD_VER >= 17
1149 template <class _Tp, class = enable_if_t<is_same_v<_Tp, filesystem::path>>>
1150 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY
1151 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const _Tp& __p, ios_base::openmode __mode = ios_base::in)
1152 : basic_ifstream(__p.c_str(), __mode) {}
1153# endif // _LIBCPP_STD_VER >= 17
1154 _LIBCPP_HIDE_FROM_ABI basic_ifstream(basic_ifstream&& __rhs);
1155 _LIBCPP_HIDE_FROM_ABI basic_ifstream& operator=(basic_ifstream&& __rhs);
1156 _LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream& __rhs);
1157
1158 _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
1159# if _LIBCPP_STD_VER >= 26
1160 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
1161# endif
1162 _LIBCPP_HIDE_FROM_ABI bool is_open() const;
1163 void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1164# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1165 void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1166# endif
1167 void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1168# if _LIBCPP_STD_VER >= 17
1169 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void
1170 open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in) {
1171 return open(__p.c_str(), __mode);
1172 }
1173# endif // _LIBCPP_STD_VER >= 17
1174
1175 _LIBCPP_HIDE_FROM_ABI void __open(int __fd, ios_base::openmode __mode);
1176 _LIBCPP_HIDE_FROM_ABI void close();
1177
1178private:
1179 basic_filebuf<char_type, traits_type> __sb_;
1180};
1181
1182template <class _CharT, class _Traits>
1183inline basic_ifstream<_CharT, _Traits>::basic_ifstream()
1184 : basic_istream<char_type, traits_type>(std::addressof(__sb_)) {}
1185
1186template <class _CharT, class _Traits>
1187inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1188 : basic_istream<char_type, traits_type>(std::addressof(__sb_)) {
1189 if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1190 this->setstate(ios_base::failbit);
1191}
1192
1193# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1194template <class _CharT, class _Traits>
1195inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const wchar_t* __s, ios_base::openmode __mode)
1196 : basic_istream<char_type, traits_type>(std::addressof(__sb_)) {
1197 if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1198 this->setstate(ios_base::failbit);
1199}
1200# endif
1201
1202// extension
1203template <class _CharT, class _Traits>
1204inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1205 : basic_istream<char_type, traits_type>(std::addressof(__sb_)) {
1206 if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1207 this->setstate(ios_base::failbit);
1208}
1209
1210template <class _CharT, class _Traits>
1211inline basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1212 : basic_istream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) {
1213 this->set_rdbuf(std::addressof(__sb_));
1214}
1215
1216template <class _CharT, class _Traits>
1217inline basic_ifstream<_CharT, _Traits>& basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs) {
1218 basic_istream<char_type, traits_type>::operator=(std::move(__rhs));
1219 __sb_ = std::move(__rhs.__sb_);
1220 return *this;
1221}
1222
1223template <class _CharT, class _Traits>
1224inline void basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs) {
1225 basic_istream<char_type, traits_type>::swap(__rhs);
1226 __sb_.swap(__rhs.__sb_);
1227}
1228
1229template <class _CharT, class _Traits>
1230inline _LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y) {
1231 __x.swap(__y);
1232}
1233
1234template <class _CharT, class _Traits>
1235inline basic_filebuf<_CharT, _Traits>* basic_ifstream<_CharT, _Traits>::rdbuf() const {
1236 return const_cast<basic_filebuf<char_type, traits_type>*>(std::addressof(__sb_));
1237}
1238
1239template <class _CharT, class _Traits>
1240inline bool basic_ifstream<_CharT, _Traits>::is_open() const {
1241 return __sb_.is_open();
1242}
1243
1244template <class _CharT, class _Traits>
1245void basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
1246 if (__sb_.open(__s, __mode | ios_base::in))
1247 this->clear();
1248 else
1249 this->setstate(ios_base::failbit);
1250}
1251
1252# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1253template <class _CharT, class _Traits>
1254void basic_ifstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
1255 if (__sb_.open(__s, __mode | ios_base::in))
1256 this->clear();
1257 else
1258 this->setstate(ios_base::failbit);
1259}
1260# endif
1261
1262template <class _CharT, class _Traits>
1263void basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
1264 if (__sb_.open(__s, __mode | ios_base::in))
1265 this->clear();
1266 else
1267 this->setstate(ios_base::failbit);
1268}
1269
1270template <class _CharT, class _Traits>
1271inline void basic_ifstream<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
1272 if (__sb_.__open(__fd, __mode | ios_base::in))
1273 this->clear();
1274 else
1275 this->setstate(ios_base::failbit);
1276}
1277
1278template <class _CharT, class _Traits>
1279inline void basic_ifstream<_CharT, _Traits>::close() {
1280 if (__sb_.close() == 0)
1281 this->setstate(ios_base::failbit);
1282}
1283
1284// basic_ofstream
1285
1286template <class _CharT, class _Traits>
1287class basic_ofstream : public basic_ostream<_CharT, _Traits> {
1288public:
1289 typedef _CharT char_type;
1290 typedef _Traits traits_type;
1291 typedef typename traits_type::int_type int_type;
1292 typedef typename traits_type::pos_type pos_type;
1293 typedef typename traits_type::off_type off_type;
1294# if _LIBCPP_STD_VER >= 26
1295 using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
1296# endif
1297
1298 _LIBCPP_HIDE_FROM_ABI basic_ofstream();
1299 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1300# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1301 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1302# endif
1303 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1304
1305# if _LIBCPP_STD_VER >= 17
1306 template <class _Tp, class = enable_if_t<is_same_v<_Tp, filesystem::path>>>
1307 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY
1308 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const _Tp& __p, ios_base::openmode __mode = ios_base::out)
1309 : basic_ofstream(__p.c_str(), __mode) {}
1310# endif // _LIBCPP_STD_VER >= 17
1311
1312 _LIBCPP_HIDE_FROM_ABI basic_ofstream(basic_ofstream&& __rhs);
1313 _LIBCPP_HIDE_FROM_ABI basic_ofstream& operator=(basic_ofstream&& __rhs);
1314 _LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream& __rhs);
1315
1316 _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
1317# if _LIBCPP_STD_VER >= 26
1318 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
1319# endif
1320 _LIBCPP_HIDE_FROM_ABI bool is_open() const;
1321 void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1322# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1323 void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1324# endif
1325 void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1326
1327# if _LIBCPP_STD_VER >= 17
1328 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void
1329 open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out) {
1330 return open(__p.c_str(), __mode);
1331 }
1332# endif // _LIBCPP_STD_VER >= 17
1333
1334 _LIBCPP_HIDE_FROM_ABI void __open(int __fd, ios_base::openmode __mode);
1335 _LIBCPP_HIDE_FROM_ABI void close();
1336
1337private:
1338 basic_filebuf<char_type, traits_type> __sb_;
1339};
1340
1341template <class _CharT, class _Traits>
1342inline basic_ofstream<_CharT, _Traits>::basic_ofstream()
1343 : basic_ostream<char_type, traits_type>(std::addressof(__sb_)) {}
1344
1345template <class _CharT, class _Traits>
1346inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1347 : basic_ostream<char_type, traits_type>(std::addressof(__sb_)) {
1348 if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1349 this->setstate(ios_base::failbit);
1350}
1351
1352# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1353template <class _CharT, class _Traits>
1354inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const wchar_t* __s, ios_base::openmode __mode)
1355 : basic_ostream<char_type, traits_type>(std::addressof(__sb_)) {
1356 if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1357 this->setstate(ios_base::failbit);
1358}
1359# endif
1360
1361// extension
1362template <class _CharT, class _Traits>
1363inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1364 : basic_ostream<char_type, traits_type>(std::addressof(__sb_)) {
1365 if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1366 this->setstate(ios_base::failbit);
1367}
1368
1369template <class _CharT, class _Traits>
1370inline basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1371 : basic_ostream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) {
1372 this->set_rdbuf(std::addressof(__sb_));
1373}
1374
1375template <class _CharT, class _Traits>
1376inline basic_ofstream<_CharT, _Traits>& basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs) {
1377 basic_ostream<char_type, traits_type>::operator=(std::move(__rhs));
1378 __sb_ = std::move(__rhs.__sb_);
1379 return *this;
1380}
1381
1382template <class _CharT, class _Traits>
1383inline void basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs) {
1384 basic_ostream<char_type, traits_type>::swap(__rhs);
1385 __sb_.swap(__rhs.__sb_);
1386}
1387
1388template <class _CharT, class _Traits>
1389inline _LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y) {
1390 __x.swap(__y);
1391}
1392
1393template <class _CharT, class _Traits>
1394inline basic_filebuf<_CharT, _Traits>* basic_ofstream<_CharT, _Traits>::rdbuf() const {
1395 return const_cast<basic_filebuf<char_type, traits_type>*>(std::addressof(__sb_));
1396}
1397
1398template <class _CharT, class _Traits>
1399inline bool basic_ofstream<_CharT, _Traits>::is_open() const {
1400 return __sb_.is_open();
1401}
1402
1403template <class _CharT, class _Traits>
1404void basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
1405 if (__sb_.open(__s, __mode | ios_base::out))
1406 this->clear();
1407 else
1408 this->setstate(ios_base::failbit);
1409}
1410
1411# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1412template <class _CharT, class _Traits>
1413void basic_ofstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
1414 if (__sb_.open(__s, __mode | ios_base::out))
1415 this->clear();
1416 else
1417 this->setstate(ios_base::failbit);
1418}
1419# endif
1420
1421template <class _CharT, class _Traits>
1422void basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
1423 if (__sb_.open(__s, __mode | ios_base::out))
1424 this->clear();
1425 else
1426 this->setstate(ios_base::failbit);
1427}
1428
1429template <class _CharT, class _Traits>
1430inline void basic_ofstream<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
1431 if (__sb_.__open(__fd, __mode | ios_base::out))
1432 this->clear();
1433 else
1434 this->setstate(ios_base::failbit);
1435}
1436
1437template <class _CharT, class _Traits>
1438inline void basic_ofstream<_CharT, _Traits>::close() {
1439 if (__sb_.close() == nullptr)
1440 this->setstate(ios_base::failbit);
1441}
1442
1443// basic_fstream
1444
1445template <class _CharT, class _Traits>
1446class basic_fstream : public basic_iostream<_CharT, _Traits> {
1447public:
1448 typedef _CharT char_type;
1449 typedef _Traits traits_type;
1450 typedef typename traits_type::int_type int_type;
1451 typedef typename traits_type::pos_type pos_type;
1452 typedef typename traits_type::off_type off_type;
1453# if _LIBCPP_STD_VER >= 26
1454 using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
1455# endif
1456
1457 _LIBCPP_HIDE_FROM_ABI basic_fstream();
1458 _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const char* __s,
1459 ios_base::openmode __mode = ios_base::in | ios_base::out);
1460# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1461 _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const wchar_t* __s,
1462 ios_base::openmode __mode = ios_base::in | ios_base::out);
1463# endif
1464 _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const string& __s,
1465 ios_base::openmode __mode = ios_base::in | ios_base::out);
1466
1467# if _LIBCPP_STD_VER >= 17
1468 template <class _Tp, class = enable_if_t<is_same_v<_Tp, filesystem::path>>>
1469 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(
1470 const _Tp& __p, ios_base::openmode __mode = ios_base::in | ios_base::out)
1471 : basic_fstream(__p.c_str(), __mode) {}
1472# endif // _LIBCPP_STD_VER >= 17
1473
1474 _LIBCPP_HIDE_FROM_ABI basic_fstream(basic_fstream&& __rhs);
1475
1476 _LIBCPP_HIDE_FROM_ABI basic_fstream& operator=(basic_fstream&& __rhs);
1477
1478 _LIBCPP_HIDE_FROM_ABI void swap(basic_fstream& __rhs);
1479
1480 _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
1481# if _LIBCPP_STD_VER >= 26
1482 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
1483# endif
1484 _LIBCPP_HIDE_FROM_ABI bool is_open() const;
1485 _LIBCPP_HIDE_FROM_ABI void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1486# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1487 void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1488# endif
1489 _LIBCPP_HIDE_FROM_ABI void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1490
1491# if _LIBCPP_STD_VER >= 17
1492 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void
1493 open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out) {
1494 return open(__p.c_str(), __mode);
1495 }
1496# endif // _LIBCPP_STD_VER >= 17
1497
1498 _LIBCPP_HIDE_FROM_ABI void close();
1499
1500private:
1501 basic_filebuf<char_type, traits_type> __sb_;
1502};
1503
1504template <class _CharT, class _Traits>
1505inline basic_fstream<_CharT, _Traits>::basic_fstream()
1506 : basic_iostream<char_type, traits_type>(std::addressof(__sb_)) {}
1507
1508template <class _CharT, class _Traits>
1509inline basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1510 : basic_iostream<char_type, traits_type>(std::addressof(__sb_)) {
1511 if (__sb_.open(__s, __mode) == nullptr)
1512 this->setstate(ios_base::failbit);
1513}
1514
1515# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1516template <class _CharT, class _Traits>
1517inline basic_fstream<_CharT, _Traits>::basic_fstream(const wchar_t* __s, ios_base::openmode __mode)
1518 : basic_iostream<char_type, traits_type>(std::addressof(__sb_)) {
1519 if (__sb_.open(__s, __mode) == nullptr)
1520 this->setstate(ios_base::failbit);
1521}
1522# endif
1523
1524template <class _CharT, class _Traits>
1525inline basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1526 : basic_iostream<char_type, traits_type>(std::addressof(__sb_)) {
1527 if (__sb_.open(__s, __mode) == nullptr)
1528 this->setstate(ios_base::failbit);
1529}
1530
1531// extension
1532template <class _CharT, class _Traits>
1533inline basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1534 : basic_iostream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) {
1535 this->set_rdbuf(std::addressof(__sb_));
1536}
1537
1538template <class _CharT, class _Traits>
1539inline basic_fstream<_CharT, _Traits>& basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs) {
1540 basic_iostream<char_type, traits_type>::operator=(std::move(__rhs));
1541 __sb_ = std::move(__rhs.__sb_);
1542 return *this;
1543}
1544
1545template <class _CharT, class _Traits>
1546inline void basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs) {
1547 basic_iostream<char_type, traits_type>::swap(__rhs);
1548 __sb_.swap(__rhs.__sb_);
1549}
1550
1551template <class _CharT, class _Traits>
1552inline _LIBCPP_HIDE_FROM_ABI void swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y) {
1553 __x.swap(__y);
1554}
1555
1556template <class _CharT, class _Traits>
1557inline basic_filebuf<_CharT, _Traits>* basic_fstream<_CharT, _Traits>::rdbuf() const {
1558 return const_cast<basic_filebuf<char_type, traits_type>*>(std::addressof(__sb_));
1559}
1560
1561template <class _CharT, class _Traits>
1562inline bool basic_fstream<_CharT, _Traits>::is_open() const {
1563 return __sb_.is_open();
1564}
1565
1566template <class _CharT, class _Traits>
1567void basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
1568 if (__sb_.open(__s, __mode))
1569 this->clear();
1570 else
1571 this->setstate(ios_base::failbit);
1572}
1573
1574# if _LIBCPP_HAS_OPEN_WITH_WCHAR
1575template <class _CharT, class _Traits>
1576void basic_fstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
1577 if (__sb_.open(__s, __mode))
1578 this->clear();
1579 else
1580 this->setstate(ios_base::failbit);
1581}
1582# endif
1583
1584template <class _CharT, class _Traits>
1585void basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
1586 if (__sb_.open(__s, __mode))
1587 this->clear();
1588 else
1589 this->setstate(ios_base::failbit);
1590}
1591
1592template <class _CharT, class _Traits>
1593inline void basic_fstream<_CharT, _Traits>::close() {
1594 if (__sb_.close() == nullptr)
1595 this->setstate(ios_base::failbit);
1596}
1597
1598# if _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
1599extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>;
1600extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>;
1601extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>;
1602# endif
1603
1604_LIBCPP_END_NAMESPACE_STD
1605
1606_LIBCPP_POP_MACROS
1607
1608# endif // _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
1609
1610# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
1611# include <atomic>
1612# include <concepts>
1613# include <cstdlib>
1614# include <iosfwd>
1615# include <limits>
1616# include <mutex>
1617# include <new>
1618# include <stdexcept>
1619# include <type_traits>
1620# endif
1621
1622# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 23
1623# include <filesystem>
1624# endif
1625#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
1626
1627#endif // _LIBCPP_FSTREAM