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