1// -*- C++ -*-
2//===------------------------- fstream ------------------------------------===//
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
77    basic_ifstream();
78    explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
79    explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);
80    explicit basic_ifstream(const filesystem::path& p,
81                            ios_base::openmode mode = ios_base::in); // C++17
82    basic_ifstream(basic_ifstream&& rhs);
83
84    basic_ifstream& operator=(basic_ifstream&& rhs);
85    void swap(basic_ifstream& rhs);
86
87    basic_filebuf<char_type, traits_type>* rdbuf() const;
88    bool is_open() const;
89    void open(const char* s, ios_base::openmode mode = ios_base::in);
90    void open(const string& s, ios_base::openmode mode = ios_base::in);
91    void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in); // C++17
92
93    void close();
94};
95
96template <class charT, class traits>
97  void
98  swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
99
100typedef basic_ifstream<char>    ifstream;
101typedef basic_ifstream<wchar_t> wifstream;
102
103template <class charT, class traits = char_traits<charT> >
104class basic_ofstream
105    : public basic_ostream<charT,traits>
106{
107public:
108    typedef charT                          char_type;
109    typedef traits                         traits_type;
110    typedef typename traits_type::int_type int_type;
111    typedef typename traits_type::pos_type pos_type;
112    typedef typename traits_type::off_type off_type;
113
114    basic_ofstream();
115    explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
116    explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
117    explicit basic_ofstream(const filesystem::path& p,
118                            ios_base::openmode mode = ios_base::out); // C++17
119    basic_ofstream(basic_ofstream&& rhs);
120
121    basic_ofstream& operator=(basic_ofstream&& rhs);
122    void swap(basic_ofstream& rhs);
123
124    basic_filebuf<char_type, traits_type>* rdbuf() const;
125    bool is_open() const;
126    void open(const char* s, ios_base::openmode mode = ios_base::out);
127    void open(const string& s, ios_base::openmode mode = ios_base::out);
128    void open(const filesystem::path& p,
129              ios_base::openmode mode = ios_base::out); // C++17
130
131    void close();
132};
133
134template <class charT, class traits>
135  void
136  swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
137
138typedef basic_ofstream<char>    ofstream;
139typedef basic_ofstream<wchar_t> wofstream;
140
141template <class charT, class traits=char_traits<charT> >
142class basic_fstream
143    : public basic_iostream<charT,traits>
144{
145public:
146    typedef charT                          char_type;
147    typedef traits                         traits_type;
148    typedef typename traits_type::int_type int_type;
149    typedef typename traits_type::pos_type pos_type;
150    typedef typename traits_type::off_type off_type;
151
152    basic_fstream();
153    explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
154    explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
155    explicit basic_fstream(const filesystem::path& p,
156                           ios_base::openmode mode = ios_base::in|ios_base::out); C++17
157    basic_fstream(basic_fstream&& rhs);
158
159    basic_fstream& operator=(basic_fstream&& rhs);
160    void swap(basic_fstream& rhs);
161
162    basic_filebuf<char_type, traits_type>* rdbuf() const;
163    bool is_open() const;
164    void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
165    void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
166    void open(const filesystem::path& s,
167              ios_base::openmode mode = ios_base::in|ios_base::out); // C++17
168
169    void close();
170};
171
172template <class charT, class traits>
173  void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
174
175typedef basic_fstream<char>    fstream;
176typedef basic_fstream<wchar_t> wfstream;
177
178}  // std
179
180*/
181
182#include <__config>
183#include <__availability>
184#include <ostream>
185#include <istream>
186#include <__locale>
187#include <cstdio>
188#include <cstdlib>
189#include <filesystem>
190
191#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
192#pragma GCC system_header
193#endif
194
195_LIBCPP_PUSH_MACROS
196#include <__undef_macros>
197
198
199_LIBCPP_BEGIN_NAMESPACE_STD
200
201template <class _CharT, class _Traits>
202class _LIBCPP_TEMPLATE_VIS basic_filebuf
203    : public basic_streambuf<_CharT, _Traits>
204{
205public:
206    typedef _CharT                           char_type;
207    typedef _Traits                          traits_type;
208    typedef typename traits_type::int_type   int_type;
209    typedef typename traits_type::pos_type   pos_type;
210    typedef typename traits_type::off_type   off_type;
211    typedef typename traits_type::state_type state_type;
212
213    // 27.9.1.2 Constructors/destructor:
214    basic_filebuf();
215#ifndef _LIBCPP_CXX03_LANG
216    basic_filebuf(basic_filebuf&& __rhs);
217#endif
218    virtual ~basic_filebuf();
219
220    // 27.9.1.3 Assign/swap:
221#ifndef _LIBCPP_CXX03_LANG
222    _LIBCPP_INLINE_VISIBILITY
223    basic_filebuf& operator=(basic_filebuf&& __rhs);
224#endif
225    void swap(basic_filebuf& __rhs);
226
227    // 27.9.1.4 Members:
228    _LIBCPP_INLINE_VISIBILITY
229    bool is_open() const;
230#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
231    basic_filebuf* open(const char* __s, ios_base::openmode __mode);
232#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
233    basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode);
234#endif
235    _LIBCPP_INLINE_VISIBILITY
236    basic_filebuf* open(const string& __s, ios_base::openmode __mode);
237
238#if _LIBCPP_STD_VER >= 17
239    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
240    basic_filebuf* open(const _VSTD_FS::path& __p, ios_base::openmode __mode) {
241      return open(__p.c_str(), __mode);
242    }
243#endif
244    inline _LIBCPP_INLINE_VISIBILITY
245    basic_filebuf* __open(int __fd, ios_base::openmode __mode);
246#endif
247    basic_filebuf* close();
248
249    _LIBCPP_INLINE_VISIBILITY
250    inline static const char*
251    __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
252
253  protected:
254    // 27.9.1.5 Overridden virtual functions:
255    virtual int_type underflow();
256    virtual int_type pbackfail(int_type __c = traits_type::eof());
257    virtual int_type overflow (int_type __c = traits_type::eof());
258    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
259    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
260                             ios_base::openmode __wch = ios_base::in | ios_base::out);
261    virtual pos_type seekpos(pos_type __sp,
262                             ios_base::openmode __wch = ios_base::in | ios_base::out);
263    virtual int sync();
264    virtual void imbue(const locale& __loc);
265
266private:
267  char* __extbuf_;
268  const char* __extbufnext_;
269  const char* __extbufend_;
270  char __extbuf_min_[8];
271  size_t __ebs_;
272  char_type* __intbuf_;
273  size_t __ibs_;
274  FILE* __file_;
275  const codecvt<char_type, char, state_type>* __cv_;
276  state_type __st_;
277  state_type __st_last_;
278  ios_base::openmode __om_;
279  ios_base::openmode __cm_;
280  bool __owns_eb_;
281  bool __owns_ib_;
282  bool __always_noconv_;
283
284  bool __read_mode();
285  void __write_mode();
286};
287
288template <class _CharT, class _Traits>
289basic_filebuf<_CharT, _Traits>::basic_filebuf()
290    : __extbuf_(nullptr),
291      __extbufnext_(nullptr),
292      __extbufend_(nullptr),
293      __ebs_(0),
294      __intbuf_(nullptr),
295      __ibs_(0),
296      __file_(nullptr),
297      __cv_(nullptr),
298      __st_(),
299      __st_last_(),
300      __om_(0),
301      __cm_(0),
302      __owns_eb_(false),
303      __owns_ib_(false),
304      __always_noconv_(false)
305{
306    if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
307    {
308        __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
309        __always_noconv_ = __cv_->always_noconv();
310    }
311    setbuf(nullptr, 4096);
312}
313
314#ifndef _LIBCPP_CXX03_LANG
315
316template <class _CharT, class _Traits>
317basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
318    : basic_streambuf<_CharT, _Traits>(__rhs)
319{
320    if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
321    {
322        __extbuf_ = __extbuf_min_;
323        __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
324        __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
325    }
326    else
327    {
328        __extbuf_ = __rhs.__extbuf_;
329        __extbufnext_ = __rhs.__extbufnext_;
330        __extbufend_ = __rhs.__extbufend_;
331    }
332    __ebs_ = __rhs.__ebs_;
333    __intbuf_ = __rhs.__intbuf_;
334    __ibs_ = __rhs.__ibs_;
335    __file_ = __rhs.__file_;
336    __cv_ = __rhs.__cv_;
337    __st_ = __rhs.__st_;
338    __st_last_ = __rhs.__st_last_;
339    __om_ = __rhs.__om_;
340    __cm_ = __rhs.__cm_;
341    __owns_eb_ = __rhs.__owns_eb_;
342    __owns_ib_ = __rhs.__owns_ib_;
343    __always_noconv_ = __rhs.__always_noconv_;
344    if (__rhs.pbase())
345    {
346        if (__rhs.pbase() == __rhs.__intbuf_)
347            this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
348        else
349            this->setp((char_type*)__extbuf_,
350                       (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
351        this->__pbump(__rhs. pptr() - __rhs.pbase());
352    }
353    else if (__rhs.eback())
354    {
355        if (__rhs.eback() == __rhs.__intbuf_)
356            this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
357                                  __intbuf_ + (__rhs.egptr() - __rhs.eback()));
358        else
359            this->setg((char_type*)__extbuf_,
360                       (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
361                       (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
362    }
363    __rhs.__extbuf_ = nullptr;
364    __rhs.__extbufnext_ = nullptr;
365    __rhs.__extbufend_ = nullptr;
366    __rhs.__ebs_ = 0;
367    __rhs.__intbuf_ = 0;
368    __rhs.__ibs_ = 0;
369    __rhs.__file_ = nullptr;
370    __rhs.__st_ = state_type();
371    __rhs.__st_last_ = state_type();
372    __rhs.__om_ = 0;
373    __rhs.__cm_ = 0;
374    __rhs.__owns_eb_ = false;
375    __rhs.__owns_ib_ = false;
376    __rhs.setg(0, 0, 0);
377    __rhs.setp(0, 0);
378}
379
380template <class _CharT, class _Traits>
381inline
382basic_filebuf<_CharT, _Traits>&
383basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
384{
385    close();
386    swap(__rhs);
387    return *this;
388}
389
390#endif  // _LIBCPP_CXX03_LANG
391
392template <class _CharT, class _Traits>
393basic_filebuf<_CharT, _Traits>::~basic_filebuf()
394{
395#ifndef _LIBCPP_NO_EXCEPTIONS
396    try
397    {
398#endif  // _LIBCPP_NO_EXCEPTIONS
399        close();
400#ifndef _LIBCPP_NO_EXCEPTIONS
401    }
402    catch (...)
403    {
404    }
405#endif  // _LIBCPP_NO_EXCEPTIONS
406    if (__owns_eb_)
407        delete [] __extbuf_;
408    if (__owns_ib_)
409        delete [] __intbuf_;
410}
411
412template <class _CharT, class _Traits>
413void
414basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs)
415{
416    basic_streambuf<char_type, traits_type>::swap(__rhs);
417    if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
418    {
419        _VSTD::swap(__extbuf_, __rhs.__extbuf_);
420        _VSTD::swap(__extbufnext_, __rhs.__extbufnext_);
421        _VSTD::swap(__extbufend_, __rhs.__extbufend_);
422    }
423    else
424    {
425        ptrdiff_t __ln = __extbufnext_ - __extbuf_;
426        ptrdiff_t __le = __extbufend_ - __extbuf_;
427        ptrdiff_t __rn = __rhs.__extbufnext_ - __rhs.__extbuf_;
428        ptrdiff_t __re = __rhs.__extbufend_ - __rhs.__extbuf_;
429        if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
430        {
431            __extbuf_ = __rhs.__extbuf_;
432            __rhs.__extbuf_ = __rhs.__extbuf_min_;
433        }
434        else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_)
435        {
436            __rhs.__extbuf_ = __extbuf_;
437            __extbuf_ = __extbuf_min_;
438        }
439        __extbufnext_ = __extbuf_ + __rn;
440        __extbufend_ = __extbuf_ + __re;
441        __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
442        __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
443    }
444    _VSTD::swap(__ebs_, __rhs.__ebs_);
445    _VSTD::swap(__intbuf_, __rhs.__intbuf_);
446    _VSTD::swap(__ibs_, __rhs.__ibs_);
447    _VSTD::swap(__file_, __rhs.__file_);
448    _VSTD::swap(__cv_, __rhs.__cv_);
449    _VSTD::swap(__st_, __rhs.__st_);
450    _VSTD::swap(__st_last_, __rhs.__st_last_);
451    _VSTD::swap(__om_, __rhs.__om_);
452    _VSTD::swap(__cm_, __rhs.__cm_);
453    _VSTD::swap(__owns_eb_, __rhs.__owns_eb_);
454    _VSTD::swap(__owns_ib_, __rhs.__owns_ib_);
455    _VSTD::swap(__always_noconv_, __rhs.__always_noconv_);
456    if (this->eback() == (char_type*)__rhs.__extbuf_min_)
457    {
458        ptrdiff_t __n = this->gptr() - this->eback();
459        ptrdiff_t __e = this->egptr() - this->eback();
460        this->setg((char_type*)__extbuf_min_,
461                   (char_type*)__extbuf_min_ + __n,
462                   (char_type*)__extbuf_min_ + __e);
463    }
464    else if (this->pbase() == (char_type*)__rhs.__extbuf_min_)
465    {
466        ptrdiff_t __n = this->pptr() - this->pbase();
467        ptrdiff_t __e = this->epptr() - this->pbase();
468        this->setp((char_type*)__extbuf_min_,
469                   (char_type*)__extbuf_min_ + __e);
470        this->__pbump(__n);
471    }
472    if (__rhs.eback() == (char_type*)__extbuf_min_)
473    {
474        ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
475        ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
476        __rhs.setg((char_type*)__rhs.__extbuf_min_,
477                   (char_type*)__rhs.__extbuf_min_ + __n,
478                   (char_type*)__rhs.__extbuf_min_ + __e);
479    }
480    else if (__rhs.pbase() == (char_type*)__extbuf_min_)
481    {
482        ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
483        ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
484        __rhs.setp((char_type*)__rhs.__extbuf_min_,
485                   (char_type*)__rhs.__extbuf_min_ + __e);
486        __rhs.__pbump(__n);
487    }
488}
489
490template <class _CharT, class _Traits>
491inline _LIBCPP_INLINE_VISIBILITY
492void
493swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
494{
495    __x.swap(__y);
496}
497
498template <class _CharT, class _Traits>
499inline
500bool
501basic_filebuf<_CharT, _Traits>::is_open() const
502{
503    return __file_ != nullptr;
504}
505
506template <class _CharT, class _Traits>
507const char* basic_filebuf<_CharT, _Traits>::__make_mdstring(
508    ios_base::openmode __mode) _NOEXCEPT {
509  switch (__mode & ~ios_base::ate) {
510  case ios_base::out:
511  case ios_base::out | ios_base::trunc:
512    return "w" _LIBCPP_FOPEN_CLOEXEC_MODE;
513  case ios_base::out | ios_base::app:
514  case ios_base::app:
515    return "a" _LIBCPP_FOPEN_CLOEXEC_MODE;
516  case ios_base::in:
517    return "r" _LIBCPP_FOPEN_CLOEXEC_MODE;
518  case ios_base::in | ios_base::out:
519    return "r+" _LIBCPP_FOPEN_CLOEXEC_MODE;
520  case ios_base::in | ios_base::out | ios_base::trunc:
521    return "w+" _LIBCPP_FOPEN_CLOEXEC_MODE;
522  case ios_base::in | ios_base::out | ios_base::app:
523  case ios_base::in | ios_base::app:
524    return "a+" _LIBCPP_FOPEN_CLOEXEC_MODE;
525  case ios_base::out | ios_base::binary:
526  case ios_base::out | ios_base::trunc | ios_base::binary:
527    return "wb" _LIBCPP_FOPEN_CLOEXEC_MODE;
528  case ios_base::out | ios_base::app | ios_base::binary:
529  case ios_base::app | ios_base::binary:
530    return "ab" _LIBCPP_FOPEN_CLOEXEC_MODE;
531  case ios_base::in | ios_base::binary:
532    return "rb" _LIBCPP_FOPEN_CLOEXEC_MODE;
533  case ios_base::in | ios_base::out | ios_base::binary:
534    return "r+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
535  case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
536    return "w+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
537  case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
538  case ios_base::in | ios_base::app | ios_base::binary:
539    return "a+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
540  default:
541    return nullptr;
542  }
543  _LIBCPP_UNREACHABLE();
544}
545
546#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
547template <class _CharT, class _Traits>
548basic_filebuf<_CharT, _Traits>*
549basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
550{
551    basic_filebuf<_CharT, _Traits>* __rt = nullptr;
552    if (__file_ == nullptr)
553    {
554      if (const char* __mdstr = __make_mdstring(__mode)) {
555        __rt = this;
556        __file_ = fopen(__s, __mdstr);
557        if (__file_) {
558          __om_ = __mode;
559          if (__mode & ios_base::ate) {
560            if (fseek(__file_, 0, SEEK_END)) {
561              fclose(__file_);
562              __file_ = nullptr;
563              __rt = nullptr;
564            }
565          }
566        } else
567          __rt = nullptr;
568      }
569    }
570    return __rt;
571}
572
573template <class _CharT, class _Traits>
574inline _LIBCPP_INLINE_VISIBILITY
575basic_filebuf<_CharT, _Traits>*
576basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
577  basic_filebuf<_CharT, _Traits>* __rt = nullptr;
578  if (__file_ == nullptr) {
579    if (const char* __mdstr = __make_mdstring(__mode)) {
580      __rt = this;
581      __file_ = fdopen(__fd, __mdstr);
582      if (__file_) {
583        __om_ = __mode;
584        if (__mode & ios_base::ate) {
585          if (fseek(__file_, 0, SEEK_END)) {
586            fclose(__file_);
587            __file_ = nullptr;
588            __rt = nullptr;
589          }
590        }
591      } else
592        __rt = nullptr;
593    }
594  }
595  return __rt;
596}
597
598#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
599// This is basically the same as the char* overload except that it uses _wfopen
600// and long mode strings.
601template <class _CharT, class _Traits>
602basic_filebuf<_CharT, _Traits>*
603basic_filebuf<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
604{
605    basic_filebuf<_CharT, _Traits>* __rt = nullptr;
606    if (__file_ == nullptr)
607    {
608        __rt = this;
609        const wchar_t* __mdstr;
610        switch (__mode & ~ios_base::ate)
611        {
612        case ios_base::out:
613        case ios_base::out | ios_base::trunc:
614            __mdstr = L"w";
615            break;
616        case ios_base::out | ios_base::app:
617        case ios_base::app:
618            __mdstr = L"a";
619            break;
620        case ios_base::in:
621            __mdstr = L"r";
622            break;
623        case ios_base::in | ios_base::out:
624            __mdstr = L"r+";
625            break;
626        case ios_base::in | ios_base::out | ios_base::trunc:
627            __mdstr = L"w+";
628            break;
629        case ios_base::in | ios_base::out | ios_base::app:
630        case ios_base::in | ios_base::app:
631            __mdstr = L"a+";
632            break;
633        case ios_base::out | ios_base::binary:
634        case ios_base::out | ios_base::trunc | ios_base::binary:
635            __mdstr = L"wb";
636            break;
637        case ios_base::out | ios_base::app | ios_base::binary:
638        case ios_base::app | ios_base::binary:
639            __mdstr = L"ab";
640            break;
641        case ios_base::in | ios_base::binary:
642            __mdstr = L"rb";
643            break;
644        case ios_base::in | ios_base::out | ios_base::binary:
645            __mdstr = L"r+b";
646            break;
647        case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
648            __mdstr = L"w+b";
649            break;
650        case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
651        case ios_base::in | ios_base::app | ios_base::binary:
652            __mdstr = L"a+b";
653            break;
654        default:
655            __rt = nullptr;
656            break;
657        }
658        if (__rt)
659        {
660            __file_ = _wfopen(__s, __mdstr);
661            if (__file_)
662            {
663                __om_ = __mode;
664                if (__mode & ios_base::ate)
665                {
666                    if (fseek(__file_, 0, SEEK_END))
667                    {
668                        fclose(__file_);
669                        __file_ = nullptr;
670                        __rt = nullptr;
671                    }
672                }
673            }
674            else
675                __rt = nullptr;
676        }
677    }
678    return __rt;
679}
680#endif
681
682template <class _CharT, class _Traits>
683inline
684basic_filebuf<_CharT, _Traits>*
685basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
686{
687    return open(__s.c_str(), __mode);
688}
689#endif
690
691template <class _CharT, class _Traits>
692basic_filebuf<_CharT, _Traits>*
693basic_filebuf<_CharT, _Traits>::close()
694{
695    basic_filebuf<_CharT, _Traits>* __rt = nullptr;
696    if (__file_)
697    {
698        __rt = this;
699        unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
700        if (sync())
701            __rt = nullptr;
702        if (fclose(__h.release()))
703            __rt = nullptr;
704        __file_ = nullptr;
705        setbuf(0, 0);
706    }
707    return __rt;
708}
709
710template <class _CharT, class _Traits>
711typename basic_filebuf<_CharT, _Traits>::int_type
712basic_filebuf<_CharT, _Traits>::underflow()
713{
714    if (__file_ == nullptr)
715        return traits_type::eof();
716    bool __initial = __read_mode();
717    char_type __1buf;
718    if (this->gptr() == nullptr)
719        this->setg(&__1buf, &__1buf+1, &__1buf+1);
720    const size_t __unget_sz = __initial ? 0 : min<size_t>((this->egptr() - this->eback()) / 2, 4);
721    int_type __c = traits_type::eof();
722    if (this->gptr() == this->egptr())
723    {
724        memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
725        if (__always_noconv_)
726        {
727            size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
728            __nmemb = fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
729            if (__nmemb != 0)
730            {
731                this->setg(this->eback(),
732                           this->eback() + __unget_sz,
733                           this->eback() + __unget_sz + __nmemb);
734                __c = traits_type::to_int_type(*this->gptr());
735            }
736        }
737        else
738        {
739            _LIBCPP_ASSERT ( !(__extbufnext_ == NULL && (__extbufend_ != __extbufnext_)), "underflow moving from NULL" );
740            if (__extbufend_ != __extbufnext_)
741                memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
742            __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
743            __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
744            size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
745                                 static_cast<size_t>(__extbufend_ - __extbufnext_));
746            codecvt_base::result __r;
747            __st_last_ = __st_;
748            size_t __nr = fread((void*) const_cast<char *>(__extbufnext_), 1, __nmemb, __file_);
749            if (__nr != 0)
750            {
751                if (!__cv_)
752                    __throw_bad_cast();
753
754                __extbufend_ = __extbufnext_ + __nr;
755                char_type*  __inext;
756                __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
757                                       this->eback() + __unget_sz,
758                                       this->eback() + __ibs_, __inext);
759                if (__r == codecvt_base::noconv)
760                {
761                    this->setg((char_type*)__extbuf_, (char_type*)__extbuf_,
762                                          (char_type*)const_cast<char *>(__extbufend_));
763                    __c = traits_type::to_int_type(*this->gptr());
764                }
765                else if (__inext != this->eback() + __unget_sz)
766                {
767                    this->setg(this->eback(), this->eback() + __unget_sz, __inext);
768                    __c = traits_type::to_int_type(*this->gptr());
769                }
770            }
771        }
772    }
773    else
774        __c = traits_type::to_int_type(*this->gptr());
775    if (this->eback() == &__1buf)
776        this->setg(nullptr, nullptr, nullptr);
777    return __c;
778}
779
780template <class _CharT, class _Traits>
781typename basic_filebuf<_CharT, _Traits>::int_type
782basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
783{
784    if (__file_ && this->eback() < this->gptr())
785    {
786        if (traits_type::eq_int_type(__c, traits_type::eof()))
787        {
788            this->gbump(-1);
789            return traits_type::not_eof(__c);
790        }
791        if ((__om_ & ios_base::out) ||
792            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
793        {
794            this->gbump(-1);
795            *this->gptr() = traits_type::to_char_type(__c);
796            return __c;
797        }
798    }
799    return traits_type::eof();
800}
801
802template <class _CharT, class _Traits>
803typename basic_filebuf<_CharT, _Traits>::int_type
804basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
805{
806    if (__file_ == nullptr)
807        return traits_type::eof();
808    __write_mode();
809    char_type __1buf;
810    char_type* __pb_save = this->pbase();
811    char_type* __epb_save = this->epptr();
812    if (!traits_type::eq_int_type(__c, traits_type::eof()))
813    {
814        if (this->pptr() == nullptr)
815            this->setp(&__1buf, &__1buf+1);
816        *this->pptr() = traits_type::to_char_type(__c);
817        this->pbump(1);
818    }
819    if (this->pptr() != this->pbase())
820    {
821        if (__always_noconv_)
822        {
823            size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
824            if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
825                return traits_type::eof();
826        }
827        else
828        {
829            char* __extbe = __extbuf_;
830            codecvt_base::result __r;
831            do
832            {
833                if (!__cv_)
834                    __throw_bad_cast();
835
836                const char_type* __e;
837                __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e,
838                                        __extbuf_, __extbuf_ + __ebs_, __extbe);
839                if (__e == this->pbase())
840                    return traits_type::eof();
841                if (__r == codecvt_base::noconv)
842                {
843                    size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
844                    if (fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
845                        return traits_type::eof();
846                }
847                else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
848                {
849                    size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
850                    if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
851                        return traits_type::eof();
852                    if (__r == codecvt_base::partial)
853                    {
854                        this->setp(const_cast<char_type*>(__e), this->pptr());
855                        this->__pbump(this->epptr() - this->pbase());
856                    }
857                }
858                else
859                    return traits_type::eof();
860            } while (__r == codecvt_base::partial);
861        }
862        this->setp(__pb_save, __epb_save);
863    }
864    return traits_type::not_eof(__c);
865}
866
867template <class _CharT, class _Traits>
868basic_streambuf<_CharT, _Traits>*
869basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n)
870{
871    this->setg(nullptr, nullptr, nullptr);
872    this->setp(nullptr, nullptr);
873    if (__owns_eb_)
874        delete [] __extbuf_;
875    if (__owns_ib_)
876        delete [] __intbuf_;
877    __ebs_ = __n;
878    if (__ebs_ > sizeof(__extbuf_min_))
879    {
880        if (__always_noconv_ && __s)
881        {
882            __extbuf_ = (char*)__s;
883            __owns_eb_ = false;
884        }
885        else
886        {
887            __extbuf_ = new char[__ebs_];
888            __owns_eb_ = true;
889        }
890    }
891    else
892    {
893        __extbuf_ = __extbuf_min_;
894        __ebs_ = sizeof(__extbuf_min_);
895        __owns_eb_ = false;
896    }
897    if (!__always_noconv_)
898    {
899        __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
900        if (__s && __ibs_ >= sizeof(__extbuf_min_))
901        {
902            __intbuf_ = __s;
903            __owns_ib_ = false;
904        }
905        else
906        {
907            __intbuf_ = new char_type[__ibs_];
908            __owns_ib_ = true;
909        }
910    }
911    else
912    {
913        __ibs_ = 0;
914        __intbuf_ = nullptr;
915        __owns_ib_ = false;
916    }
917    return this;
918}
919
920template <class _CharT, class _Traits>
921typename basic_filebuf<_CharT, _Traits>::pos_type
922basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
923                                        ios_base::openmode)
924{
925    if (!__cv_)
926        __throw_bad_cast();
927
928    int __width = __cv_->encoding();
929    if (__file_ == nullptr || (__width <= 0 && __off != 0) || sync())
930        return pos_type(off_type(-1));
931    // __width > 0 || __off == 0
932    int __whence;
933    switch (__way)
934    {
935    case ios_base::beg:
936        __whence = SEEK_SET;
937        break;
938    case ios_base::cur:
939        __whence = SEEK_CUR;
940        break;
941    case ios_base::end:
942        __whence = SEEK_END;
943        break;
944    default:
945        return pos_type(off_type(-1));
946    }
947#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
948    if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
949        return pos_type(off_type(-1));
950    pos_type __r = ftell(__file_);
951#else
952    if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
953        return pos_type(off_type(-1));
954    pos_type __r = ftello(__file_);
955#endif
956    __r.state(__st_);
957    return __r;
958}
959
960template <class _CharT, class _Traits>
961typename basic_filebuf<_CharT, _Traits>::pos_type
962basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
963{
964    if (__file_ == nullptr || sync())
965        return pos_type(off_type(-1));
966#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
967    if (fseek(__file_, __sp, SEEK_SET))
968        return pos_type(off_type(-1));
969#else
970    if (fseeko(__file_, __sp, SEEK_SET))
971        return pos_type(off_type(-1));
972#endif
973    __st_ = __sp.state();
974    return __sp;
975}
976
977template <class _CharT, class _Traits>
978int
979basic_filebuf<_CharT, _Traits>::sync()
980{
981    if (__file_ == nullptr)
982        return 0;
983    if (!__cv_)
984        __throw_bad_cast();
985
986    if (__cm_ & ios_base::out)
987    {
988        if (this->pptr() != this->pbase())
989            if (overflow() == traits_type::eof())
990                return -1;
991        codecvt_base::result __r;
992        do
993        {
994            char* __extbe;
995            __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
996            size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
997            if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
998                return -1;
999        } while (__r == codecvt_base::partial);
1000        if (__r == codecvt_base::error)
1001            return -1;
1002        if (fflush(__file_))
1003            return -1;
1004    }
1005    else if (__cm_ & ios_base::in)
1006    {
1007        off_type __c;
1008        state_type __state = __st_last_;
1009        bool __update_st = false;
1010        if (__always_noconv_)
1011            __c = this->egptr() - this->gptr();
1012        else
1013        {
1014            int __width = __cv_->encoding();
1015            __c = __extbufend_ - __extbufnext_;
1016            if (__width > 0)
1017                __c += __width * (this->egptr() - this->gptr());
1018            else
1019            {
1020                if (this->gptr() != this->egptr())
1021                {
1022                    const int __off =  __cv_->length(__state, __extbuf_,
1023                                                     __extbufnext_,
1024                                                     this->gptr() - this->eback());
1025                    __c += __extbufnext_ - __extbuf_ - __off;
1026                    __update_st = true;
1027                }
1028            }
1029        }
1030#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
1031        if (fseek(__file_, -__c, SEEK_CUR))
1032            return -1;
1033#else
1034        if (fseeko(__file_, -__c, SEEK_CUR))
1035            return -1;
1036#endif
1037        if (__update_st)
1038            __st_ = __state;
1039        __extbufnext_ = __extbufend_ = __extbuf_;
1040        this->setg(nullptr, nullptr, nullptr);
1041        __cm_ = 0;
1042    }
1043    return 0;
1044}
1045
1046template <class _CharT, class _Traits>
1047void
1048basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
1049{
1050    sync();
1051    __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
1052    bool __old_anc = __always_noconv_;
1053    __always_noconv_ = __cv_->always_noconv();
1054    if (__old_anc != __always_noconv_)
1055    {
1056        this->setg(nullptr, nullptr, nullptr);
1057        this->setp(nullptr, nullptr);
1058        // invariant, char_type is char, else we couldn't get here
1059        if (__always_noconv_)  // need to dump __intbuf_
1060        {
1061            if (__owns_eb_)
1062                delete [] __extbuf_;
1063            __owns_eb_ = __owns_ib_;
1064            __ebs_ = __ibs_;
1065            __extbuf_ = (char*)__intbuf_;
1066            __ibs_ = 0;
1067            __intbuf_ = nullptr;
1068            __owns_ib_ = false;
1069        }
1070        else  // need to obtain an __intbuf_.
1071        {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
1072            if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
1073            {
1074                __ibs_ = __ebs_;
1075                __intbuf_ = (char_type*)__extbuf_;
1076                __owns_ib_ = false;
1077                __extbuf_ = new char[__ebs_];
1078                __owns_eb_ = true;
1079            }
1080            else
1081            {
1082                __ibs_ = __ebs_;
1083                __intbuf_ = new char_type[__ibs_];
1084                __owns_ib_ = true;
1085            }
1086        }
1087    }
1088}
1089
1090template <class _CharT, class _Traits>
1091bool
1092basic_filebuf<_CharT, _Traits>::__read_mode()
1093{
1094    if (!(__cm_ & ios_base::in))
1095    {
1096        this->setp(nullptr, nullptr);
1097        if (__always_noconv_)
1098            this->setg((char_type*)__extbuf_,
1099                       (char_type*)__extbuf_ + __ebs_,
1100                       (char_type*)__extbuf_ + __ebs_);
1101        else
1102            this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
1103        __cm_ = ios_base::in;
1104        return true;
1105    }
1106    return false;
1107}
1108
1109template <class _CharT, class _Traits>
1110void
1111basic_filebuf<_CharT, _Traits>::__write_mode()
1112{
1113    if (!(__cm_ & ios_base::out))
1114    {
1115        this->setg(nullptr, nullptr, nullptr);
1116        if (__ebs_ > sizeof(__extbuf_min_))
1117        {
1118            if (__always_noconv_)
1119                this->setp((char_type*)__extbuf_,
1120                           (char_type*)__extbuf_ + (__ebs_ - 1));
1121            else
1122                this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
1123        }
1124        else
1125            this->setp(nullptr, nullptr);
1126        __cm_ = ios_base::out;
1127    }
1128}
1129
1130// basic_ifstream
1131
1132template <class _CharT, class _Traits>
1133class _LIBCPP_TEMPLATE_VIS basic_ifstream
1134    : public basic_istream<_CharT, _Traits>
1135{
1136public:
1137    typedef _CharT                         char_type;
1138    typedef _Traits                        traits_type;
1139    typedef typename traits_type::int_type int_type;
1140    typedef typename traits_type::pos_type pos_type;
1141    typedef typename traits_type::off_type off_type;
1142
1143    _LIBCPP_INLINE_VISIBILITY
1144    basic_ifstream();
1145#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1146    _LIBCPP_INLINE_VISIBILITY
1147    explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1148#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1149    _LIBCPP_INLINE_VISIBILITY
1150    explicit basic_ifstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1151#endif
1152    _LIBCPP_INLINE_VISIBILITY
1153    explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1154#if _LIBCPP_STD_VER >= 17
1155    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1156    explicit basic_ifstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in)
1157      : basic_ifstream(__p.c_str(), __mode) {}
1158#endif // _LIBCPP_STD_VER >= 17
1159#endif
1160#ifndef _LIBCPP_CXX03_LANG
1161    _LIBCPP_INLINE_VISIBILITY
1162    basic_ifstream(basic_ifstream&& __rhs);
1163
1164    _LIBCPP_INLINE_VISIBILITY
1165    basic_ifstream& operator=(basic_ifstream&& __rhs);
1166#endif
1167    _LIBCPP_INLINE_VISIBILITY
1168    void swap(basic_ifstream& __rhs);
1169
1170    _LIBCPP_INLINE_VISIBILITY
1171    basic_filebuf<char_type, traits_type>* rdbuf() const;
1172    _LIBCPP_INLINE_VISIBILITY
1173    bool is_open() const;
1174#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1175    void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1176#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1177    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1178#endif
1179    void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1180#if _LIBCPP_STD_VER >= 17
1181    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1182    void open(const filesystem::path& __p,
1183              ios_base::openmode __mode = ios_base::in) {
1184      return open(__p.c_str(), __mode);
1185    }
1186#endif // _LIBCPP_STD_VER >= 17
1187
1188    _LIBCPP_INLINE_VISIBILITY
1189    void __open(int __fd, ios_base::openmode __mode);
1190#endif
1191    _LIBCPP_INLINE_VISIBILITY
1192    void close();
1193
1194private:
1195    basic_filebuf<char_type, traits_type> __sb_;
1196};
1197
1198template <class _CharT, class _Traits>
1199inline
1200basic_ifstream<_CharT, _Traits>::basic_ifstream()
1201    : basic_istream<char_type, traits_type>(&__sb_)
1202{
1203}
1204
1205#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1206template <class _CharT, class _Traits>
1207inline
1208basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1209    : basic_istream<char_type, traits_type>(&__sb_)
1210{
1211    if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1212        this->setstate(ios_base::failbit);
1213}
1214
1215#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1216template <class _CharT, class _Traits>
1217inline
1218basic_ifstream<_CharT, _Traits>::basic_ifstream(const wchar_t* __s, ios_base::openmode __mode)
1219    : basic_istream<char_type, traits_type>(&__sb_)
1220{
1221    if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1222        this->setstate(ios_base::failbit);
1223}
1224#endif
1225
1226template <class _CharT, class _Traits>
1227inline
1228basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1229    : basic_istream<char_type, traits_type>(&__sb_)
1230{
1231    if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1232        this->setstate(ios_base::failbit);
1233}
1234#endif
1235
1236#ifndef _LIBCPP_CXX03_LANG
1237
1238template <class _CharT, class _Traits>
1239inline
1240basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1241    : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1242      __sb_(_VSTD::move(__rhs.__sb_))
1243{
1244    this->set_rdbuf(&__sb_);
1245}
1246
1247template <class _CharT, class _Traits>
1248inline
1249basic_ifstream<_CharT, _Traits>&
1250basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1251{
1252    basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1253    __sb_ = _VSTD::move(__rhs.__sb_);
1254    return *this;
1255}
1256
1257#endif  // _LIBCPP_CXX03_LANG
1258
1259template <class _CharT, class _Traits>
1260inline
1261void
1262basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1263{
1264    basic_istream<char_type, traits_type>::swap(__rhs);
1265    __sb_.swap(__rhs.__sb_);
1266}
1267
1268template <class _CharT, class _Traits>
1269inline _LIBCPP_INLINE_VISIBILITY
1270void
1271swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1272{
1273    __x.swap(__y);
1274}
1275
1276template <class _CharT, class _Traits>
1277inline
1278basic_filebuf<_CharT, _Traits>*
1279basic_ifstream<_CharT, _Traits>::rdbuf() const
1280{
1281    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1282}
1283
1284template <class _CharT, class _Traits>
1285inline
1286bool
1287basic_ifstream<_CharT, _Traits>::is_open() const
1288{
1289    return __sb_.is_open();
1290}
1291
1292#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1293template <class _CharT, class _Traits>
1294void
1295basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1296{
1297    if (__sb_.open(__s, __mode | ios_base::in))
1298        this->clear();
1299    else
1300        this->setstate(ios_base::failbit);
1301}
1302
1303#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1304template <class _CharT, class _Traits>
1305void
1306basic_ifstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1307{
1308    if (__sb_.open(__s, __mode | ios_base::in))
1309        this->clear();
1310    else
1311        this->setstate(ios_base::failbit);
1312}
1313#endif
1314
1315template <class _CharT, class _Traits>
1316void
1317basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1318{
1319    if (__sb_.open(__s, __mode | ios_base::in))
1320        this->clear();
1321    else
1322        this->setstate(ios_base::failbit);
1323}
1324
1325template <class _CharT, class _Traits>
1326void basic_ifstream<_CharT, _Traits>::__open(int __fd,
1327                                             ios_base::openmode __mode) {
1328  if (__sb_.__open(__fd, __mode | ios_base::in))
1329    this->clear();
1330  else
1331    this->setstate(ios_base::failbit);
1332}
1333#endif
1334
1335template <class _CharT, class _Traits>
1336inline
1337void
1338basic_ifstream<_CharT, _Traits>::close()
1339{
1340    if (__sb_.close() == 0)
1341        this->setstate(ios_base::failbit);
1342}
1343
1344// basic_ofstream
1345
1346template <class _CharT, class _Traits>
1347class _LIBCPP_TEMPLATE_VIS basic_ofstream
1348    : public basic_ostream<_CharT, _Traits>
1349{
1350public:
1351    typedef _CharT                         char_type;
1352    typedef _Traits                        traits_type;
1353    typedef typename traits_type::int_type int_type;
1354    typedef typename traits_type::pos_type pos_type;
1355    typedef typename traits_type::off_type off_type;
1356
1357    _LIBCPP_INLINE_VISIBILITY
1358    basic_ofstream();
1359    _LIBCPP_INLINE_VISIBILITY
1360    explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1361#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1362    _LIBCPP_INLINE_VISIBILITY
1363    explicit basic_ofstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1364#endif
1365    _LIBCPP_INLINE_VISIBILITY
1366    explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1367
1368#if _LIBCPP_STD_VER >= 17
1369    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1370    explicit basic_ofstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out)
1371      : basic_ofstream(__p.c_str(), __mode) {}
1372#endif // _LIBCPP_STD_VER >= 17
1373
1374#ifndef _LIBCPP_CXX03_LANG
1375    _LIBCPP_INLINE_VISIBILITY
1376    basic_ofstream(basic_ofstream&& __rhs);
1377
1378    _LIBCPP_INLINE_VISIBILITY
1379    basic_ofstream& operator=(basic_ofstream&& __rhs);
1380#endif
1381    _LIBCPP_INLINE_VISIBILITY
1382    void swap(basic_ofstream& __rhs);
1383
1384    _LIBCPP_INLINE_VISIBILITY
1385    basic_filebuf<char_type, traits_type>* rdbuf() const;
1386    _LIBCPP_INLINE_VISIBILITY
1387    bool is_open() const;
1388#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1389    void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1390#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1391    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1392#endif
1393    void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1394
1395#if _LIBCPP_STD_VER >= 17
1396    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1397    void open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out)
1398    { return open(__p.c_str(), __mode); }
1399#endif // _LIBCPP_STD_VER >= 17
1400
1401    _LIBCPP_INLINE_VISIBILITY
1402    void __open(int __fd, ios_base::openmode __mode);
1403#endif
1404    _LIBCPP_INLINE_VISIBILITY
1405    void close();
1406
1407private:
1408    basic_filebuf<char_type, traits_type> __sb_;
1409};
1410
1411template <class _CharT, class _Traits>
1412inline
1413basic_ofstream<_CharT, _Traits>::basic_ofstream()
1414    : basic_ostream<char_type, traits_type>(&__sb_)
1415{
1416}
1417
1418#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1419template <class _CharT, class _Traits>
1420inline
1421basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1422    : basic_ostream<char_type, traits_type>(&__sb_)
1423{
1424    if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1425        this->setstate(ios_base::failbit);
1426}
1427
1428#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1429template <class _CharT, class _Traits>
1430inline
1431basic_ofstream<_CharT, _Traits>::basic_ofstream(const wchar_t* __s, ios_base::openmode __mode)
1432    : basic_ostream<char_type, traits_type>(&__sb_)
1433{
1434    if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1435        this->setstate(ios_base::failbit);
1436}
1437#endif
1438
1439template <class _CharT, class _Traits>
1440inline
1441basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1442    : basic_ostream<char_type, traits_type>(&__sb_)
1443{
1444    if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1445        this->setstate(ios_base::failbit);
1446}
1447#endif
1448
1449#ifndef _LIBCPP_CXX03_LANG
1450
1451template <class _CharT, class _Traits>
1452inline
1453basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1454    : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1455      __sb_(_VSTD::move(__rhs.__sb_))
1456{
1457    this->set_rdbuf(&__sb_);
1458}
1459
1460template <class _CharT, class _Traits>
1461inline
1462basic_ofstream<_CharT, _Traits>&
1463basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1464{
1465    basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1466    __sb_ = _VSTD::move(__rhs.__sb_);
1467    return *this;
1468}
1469
1470#endif  // _LIBCPP_CXX03_LANG
1471
1472template <class _CharT, class _Traits>
1473inline
1474void
1475basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1476{
1477    basic_ostream<char_type, traits_type>::swap(__rhs);
1478    __sb_.swap(__rhs.__sb_);
1479}
1480
1481template <class _CharT, class _Traits>
1482inline _LIBCPP_INLINE_VISIBILITY
1483void
1484swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1485{
1486    __x.swap(__y);
1487}
1488
1489template <class _CharT, class _Traits>
1490inline
1491basic_filebuf<_CharT, _Traits>*
1492basic_ofstream<_CharT, _Traits>::rdbuf() const
1493{
1494    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1495}
1496
1497template <class _CharT, class _Traits>
1498inline
1499bool
1500basic_ofstream<_CharT, _Traits>::is_open() const
1501{
1502    return __sb_.is_open();
1503}
1504
1505#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1506template <class _CharT, class _Traits>
1507void
1508basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1509{
1510    if (__sb_.open(__s, __mode | ios_base::out))
1511        this->clear();
1512    else
1513        this->setstate(ios_base::failbit);
1514}
1515
1516#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1517template <class _CharT, class _Traits>
1518void
1519basic_ofstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1520{
1521    if (__sb_.open(__s, __mode | ios_base::out))
1522        this->clear();
1523    else
1524        this->setstate(ios_base::failbit);
1525}
1526#endif
1527
1528template <class _CharT, class _Traits>
1529void
1530basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1531{
1532    if (__sb_.open(__s, __mode | ios_base::out))
1533        this->clear();
1534    else
1535        this->setstate(ios_base::failbit);
1536}
1537
1538template <class _CharT, class _Traits>
1539void basic_ofstream<_CharT, _Traits>::__open(int __fd,
1540                                             ios_base::openmode __mode) {
1541  if (__sb_.__open(__fd, __mode | ios_base::out))
1542    this->clear();
1543  else
1544    this->setstate(ios_base::failbit);
1545}
1546#endif
1547
1548template <class _CharT, class _Traits>
1549inline
1550void
1551basic_ofstream<_CharT, _Traits>::close()
1552{
1553    if (__sb_.close() == nullptr)
1554        this->setstate(ios_base::failbit);
1555}
1556
1557// basic_fstream
1558
1559template <class _CharT, class _Traits>
1560class _LIBCPP_TEMPLATE_VIS basic_fstream
1561    : public basic_iostream<_CharT, _Traits>
1562{
1563public:
1564    typedef _CharT                         char_type;
1565    typedef _Traits                        traits_type;
1566    typedef typename traits_type::int_type int_type;
1567    typedef typename traits_type::pos_type pos_type;
1568    typedef typename traits_type::off_type off_type;
1569
1570    _LIBCPP_INLINE_VISIBILITY
1571    basic_fstream();
1572#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1573    _LIBCPP_INLINE_VISIBILITY
1574    explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1575#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1576    _LIBCPP_INLINE_VISIBILITY
1577    explicit basic_fstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1578#endif
1579    _LIBCPP_INLINE_VISIBILITY
1580    explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1581
1582#if _LIBCPP_STD_VER >= 17
1583    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1584    explicit basic_fstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out)
1585      : basic_fstream(__p.c_str(), __mode) {}
1586#endif // _LIBCPP_STD_VER >= 17
1587
1588#endif
1589#ifndef _LIBCPP_CXX03_LANG
1590    _LIBCPP_INLINE_VISIBILITY
1591    basic_fstream(basic_fstream&& __rhs);
1592
1593    _LIBCPP_INLINE_VISIBILITY
1594    basic_fstream& operator=(basic_fstream&& __rhs);
1595#endif
1596    _LIBCPP_INLINE_VISIBILITY
1597    void swap(basic_fstream& __rhs);
1598
1599    _LIBCPP_INLINE_VISIBILITY
1600    basic_filebuf<char_type, traits_type>* rdbuf() const;
1601    _LIBCPP_INLINE_VISIBILITY
1602    bool is_open() const;
1603#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1604    void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1605#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1606    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1607#endif
1608    void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1609
1610#if _LIBCPP_STD_VER >= 17
1611    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1612    void open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in|ios_base::out)
1613    { return open(__p.c_str(), __mode); }
1614#endif // _LIBCPP_STD_VER >= 17
1615
1616#endif
1617    _LIBCPP_INLINE_VISIBILITY
1618    void close();
1619
1620private:
1621    basic_filebuf<char_type, traits_type> __sb_;
1622};
1623
1624template <class _CharT, class _Traits>
1625inline
1626basic_fstream<_CharT, _Traits>::basic_fstream()
1627    : basic_iostream<char_type, traits_type>(&__sb_)
1628{
1629}
1630
1631#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1632template <class _CharT, class _Traits>
1633inline
1634basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1635    : basic_iostream<char_type, traits_type>(&__sb_)
1636{
1637    if (__sb_.open(__s, __mode) == nullptr)
1638        this->setstate(ios_base::failbit);
1639}
1640
1641#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1642template <class _CharT, class _Traits>
1643inline
1644basic_fstream<_CharT, _Traits>::basic_fstream(const wchar_t* __s, ios_base::openmode __mode)
1645    : basic_iostream<char_type, traits_type>(&__sb_)
1646{
1647    if (__sb_.open(__s, __mode) == nullptr)
1648        this->setstate(ios_base::failbit);
1649}
1650#endif
1651
1652template <class _CharT, class _Traits>
1653inline
1654basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1655    : basic_iostream<char_type, traits_type>(&__sb_)
1656{
1657    if (__sb_.open(__s, __mode) == nullptr)
1658        this->setstate(ios_base::failbit);
1659}
1660#endif
1661
1662#ifndef _LIBCPP_CXX03_LANG
1663
1664template <class _CharT, class _Traits>
1665inline
1666basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1667    : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1668      __sb_(_VSTD::move(__rhs.__sb_))
1669{
1670    this->set_rdbuf(&__sb_);
1671}
1672
1673template <class _CharT, class _Traits>
1674inline
1675basic_fstream<_CharT, _Traits>&
1676basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1677{
1678    basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1679    __sb_ = _VSTD::move(__rhs.__sb_);
1680    return *this;
1681}
1682
1683#endif  // _LIBCPP_CXX03_LANG
1684
1685template <class _CharT, class _Traits>
1686inline
1687void
1688basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1689{
1690    basic_iostream<char_type, traits_type>::swap(__rhs);
1691    __sb_.swap(__rhs.__sb_);
1692}
1693
1694template <class _CharT, class _Traits>
1695inline _LIBCPP_INLINE_VISIBILITY
1696void
1697swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1698{
1699    __x.swap(__y);
1700}
1701
1702template <class _CharT, class _Traits>
1703inline
1704basic_filebuf<_CharT, _Traits>*
1705basic_fstream<_CharT, _Traits>::rdbuf() const
1706{
1707    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1708}
1709
1710template <class _CharT, class _Traits>
1711inline
1712bool
1713basic_fstream<_CharT, _Traits>::is_open() const
1714{
1715    return __sb_.is_open();
1716}
1717
1718#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1719template <class _CharT, class _Traits>
1720void
1721basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1722{
1723    if (__sb_.open(__s, __mode))
1724        this->clear();
1725    else
1726        this->setstate(ios_base::failbit);
1727}
1728
1729#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1730template <class _CharT, class _Traits>
1731void
1732basic_fstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1733{
1734    if (__sb_.open(__s, __mode))
1735        this->clear();
1736    else
1737        this->setstate(ios_base::failbit);
1738}
1739#endif
1740
1741template <class _CharT, class _Traits>
1742void
1743basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1744{
1745    if (__sb_.open(__s, __mode))
1746        this->clear();
1747    else
1748        this->setstate(ios_base::failbit);
1749}
1750#endif
1751
1752template <class _CharT, class _Traits>
1753inline
1754void
1755basic_fstream<_CharT, _Traits>::close()
1756{
1757    if (__sb_.close() == nullptr)
1758        this->setstate(ios_base::failbit);
1759}
1760
1761#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
1762_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>)
1763_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>)
1764_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>)
1765#endif
1766
1767_LIBCPP_END_NAMESPACE_STD
1768
1769_LIBCPP_POP_MACROS
1770
1771#endif  // _LIBCPP_FSTREAM
1772