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 <ostream>
184#include <istream>
185#include <__locale>
186#include <cstdio>
187#include <cstdlib>
188#include <filesystem>
189
190#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
191#pragma GCC system_header
192#endif
193
194_LIBCPP_PUSH_MACROS
195#include <__undef_macros>
196
197
198_LIBCPP_BEGIN_NAMESPACE_STD
199
200template <class _CharT, class _Traits>
201class _LIBCPP_TEMPLATE_VIS basic_filebuf
202    : public basic_streambuf<_CharT, _Traits>
203{
204public:
205    typedef _CharT                           char_type;
206    typedef _Traits                          traits_type;
207    typedef typename traits_type::int_type   int_type;
208    typedef typename traits_type::pos_type   pos_type;
209    typedef typename traits_type::off_type   off_type;
210    typedef typename traits_type::state_type state_type;
211
212    // 27.9.1.2 Constructors/destructor:
213    basic_filebuf();
214#ifndef _LIBCPP_CXX03_LANG
215    basic_filebuf(basic_filebuf&& __rhs);
216#endif
217    virtual ~basic_filebuf();
218
219    // 27.9.1.3 Assign/swap:
220#ifndef _LIBCPP_CXX03_LANG
221    _LIBCPP_INLINE_VISIBILITY
222    basic_filebuf& operator=(basic_filebuf&& __rhs);
223#endif
224    void swap(basic_filebuf& __rhs);
225
226    // 27.9.1.4 Members:
227    _LIBCPP_INLINE_VISIBILITY
228    bool is_open() const;
229#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
230    basic_filebuf* open(const char* __s, ios_base::openmode __mode);
231#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
232    basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode);
233#endif
234    _LIBCPP_INLINE_VISIBILITY
235    basic_filebuf* open(const string& __s, ios_base::openmode __mode);
236
237#if _LIBCPP_STD_VER >= 17
238    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
239    basic_filebuf* open(const _VSTD_FS::path& __p, ios_base::openmode __mode) {
240      return open(__p.c_str(), __mode);
241    }
242#endif
243    _LIBCPP_INLINE_VISIBILITY
244    basic_filebuf* __open(int __fd, ios_base::openmode __mode);
245#endif
246    basic_filebuf* close();
247
248    _LIBCPP_INLINE_VISIBILITY
249    inline static const char*
250    __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
251
252  protected:
253    // 27.9.1.5 Overridden virtual functions:
254    virtual int_type underflow();
255    virtual int_type pbackfail(int_type __c = traits_type::eof());
256    virtual int_type overflow (int_type __c = traits_type::eof());
257    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
258    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
259                             ios_base::openmode __wch = ios_base::in | ios_base::out);
260    virtual pos_type seekpos(pos_type __sp,
261                             ios_base::openmode __wch = ios_base::in | ios_base::out);
262    virtual int sync();
263    virtual void imbue(const locale& __loc);
264
265private:
266  char* __extbuf_;
267  const char* __extbufnext_;
268  const char* __extbufend_;
269  char __extbuf_min_[8];
270  size_t __ebs_;
271  char_type* __intbuf_;
272  size_t __ibs_;
273  FILE* __file_;
274  const codecvt<char_type, char, state_type>* __cv_;
275  state_type __st_;
276  state_type __st_last_;
277  ios_base::openmode __om_;
278  ios_base::openmode __cm_;
279  bool __owns_eb_;
280  bool __owns_ib_;
281  bool __always_noconv_;
282
283  bool __read_mode();
284  void __write_mode();
285};
286
287template <class _CharT, class _Traits>
288basic_filebuf<_CharT, _Traits>::basic_filebuf()
289    : __extbuf_(0),
290      __extbufnext_(0),
291      __extbufend_(0),
292      __ebs_(0),
293      __intbuf_(0),
294      __ibs_(0),
295      __file_(0),
296      __cv_(nullptr),
297      __st_(),
298      __st_last_(),
299      __om_(0),
300      __cm_(0),
301      __owns_eb_(false),
302      __owns_ib_(false),
303      __always_noconv_(false)
304{
305    if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
306    {
307        __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
308        __always_noconv_ = __cv_->always_noconv();
309    }
310    setbuf(0, 4096);
311}
312
313#ifndef _LIBCPP_CXX03_LANG
314
315template <class _CharT, class _Traits>
316basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
317    : basic_streambuf<_CharT, _Traits>(__rhs)
318{
319    if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
320    {
321        __extbuf_ = __extbuf_min_;
322        __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
323        __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
324    }
325    else
326    {
327        __extbuf_ = __rhs.__extbuf_;
328        __extbufnext_ = __rhs.__extbufnext_;
329        __extbufend_ = __rhs.__extbufend_;
330    }
331    __ebs_ = __rhs.__ebs_;
332    __intbuf_ = __rhs.__intbuf_;
333    __ibs_ = __rhs.__ibs_;
334    __file_ = __rhs.__file_;
335    __cv_ = __rhs.__cv_;
336    __st_ = __rhs.__st_;
337    __st_last_ = __rhs.__st_last_;
338    __om_ = __rhs.__om_;
339    __cm_ = __rhs.__cm_;
340    __owns_eb_ = __rhs.__owns_eb_;
341    __owns_ib_ = __rhs.__owns_ib_;
342    __always_noconv_ = __rhs.__always_noconv_;
343    if (__rhs.pbase())
344    {
345        if (__rhs.pbase() == __rhs.__intbuf_)
346            this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
347        else
348            this->setp((char_type*)__extbuf_,
349                       (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
350        this->__pbump(__rhs. pptr() - __rhs.pbase());
351    }
352    else if (__rhs.eback())
353    {
354        if (__rhs.eback() == __rhs.__intbuf_)
355            this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
356                                  __intbuf_ + (__rhs.egptr() - __rhs.eback()));
357        else
358            this->setg((char_type*)__extbuf_,
359                       (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
360                       (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
361    }
362    __rhs.__extbuf_ = 0;
363    __rhs.__extbufnext_ = 0;
364    __rhs.__extbufend_ = 0;
365    __rhs.__ebs_ = 0;
366    __rhs.__intbuf_ = 0;
367    __rhs.__ibs_ = 0;
368    __rhs.__file_ = 0;
369    __rhs.__st_ = state_type();
370    __rhs.__st_last_ = state_type();
371    __rhs.__om_ = 0;
372    __rhs.__cm_ = 0;
373    __rhs.__owns_eb_ = false;
374    __rhs.__owns_ib_ = false;
375    __rhs.setg(0, 0, 0);
376    __rhs.setp(0, 0);
377}
378
379template <class _CharT, class _Traits>
380inline
381basic_filebuf<_CharT, _Traits>&
382basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
383{
384    close();
385    swap(__rhs);
386    return *this;
387}
388
389#endif  // _LIBCPP_CXX03_LANG
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_ != 0;
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
545#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
546template <class _CharT, class _Traits>
547basic_filebuf<_CharT, _Traits>*
548basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
549{
550    basic_filebuf<_CharT, _Traits>* __rt = 0;
551    if (__file_ == 0)
552    {
553      if (const char* __mdstr = __make_mdstring(__mode)) {
554        __rt = this;
555        __file_ = fopen(__s, __mdstr);
556        if (__file_) {
557          __om_ = __mode;
558          if (__mode & ios_base::ate) {
559            if (fseek(__file_, 0, SEEK_END)) {
560              fclose(__file_);
561              __file_ = 0;
562              __rt = 0;
563            }
564          }
565        } else
566          __rt = 0;
567      }
568    }
569    return __rt;
570}
571
572template <class _CharT, class _Traits>
573_LIBCPP_INLINE_VISIBILITY basic_filebuf<_CharT, _Traits>*
574basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
575  basic_filebuf<_CharT, _Traits>* __rt = 0;
576  if (__file_ == 0) {
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_ = 0;
586            __rt = 0;
587          }
588        }
589      } else
590        __rt = 0;
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 = 0;
604    if (__file_ == 0)
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 = 0;
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_ = 0;
668                        __rt = 0;
669                    }
670                }
671            }
672            else
673                __rt = 0;
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#endif
688
689template <class _CharT, class _Traits>
690basic_filebuf<_CharT, _Traits>*
691basic_filebuf<_CharT, _Traits>::close()
692{
693    basic_filebuf<_CharT, _Traits>* __rt = 0;
694    if (__file_)
695    {
696        __rt = this;
697        unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
698        if (sync())
699            __rt = 0;
700        if (fclose(__h.release()))
701            __rt = 0;
702        __file_ = 0;
703        setbuf(0, 0);
704    }
705    return __rt;
706}
707
708template <class _CharT, class _Traits>
709typename basic_filebuf<_CharT, _Traits>::int_type
710basic_filebuf<_CharT, _Traits>::underflow()
711{
712    if (__file_ == 0)
713        return traits_type::eof();
714    bool __initial = __read_mode();
715    char_type __1buf;
716    if (this->gptr() == 0)
717        this->setg(&__1buf, &__1buf+1, &__1buf+1);
718    const size_t __unget_sz = __initial ? 0 : min<size_t>((this->egptr() - this->eback()) / 2, 4);
719    int_type __c = traits_type::eof();
720    if (this->gptr() == this->egptr())
721    {
722        memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
723        if (__always_noconv_)
724        {
725            size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
726            __nmemb = fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
727            if (__nmemb != 0)
728            {
729                this->setg(this->eback(),
730                           this->eback() + __unget_sz,
731                           this->eback() + __unget_sz + __nmemb);
732                __c = traits_type::to_int_type(*this->gptr());
733            }
734        }
735        else
736        {
737            _LIBCPP_ASSERT ( !(__extbufnext_ == NULL && (__extbufend_ != __extbufnext_)), "underflow moving from NULL" );
738            if (__extbufend_ != __extbufnext_)
739                memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
740            __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
741            __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
742            size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
743                                 static_cast<size_t>(__extbufend_ - __extbufnext_));
744            codecvt_base::result __r;
745            __st_last_ = __st_;
746            size_t __nr = fread((void*) const_cast<char *>(__extbufnext_), 1, __nmemb, __file_);
747            if (__nr != 0)
748            {
749                if (!__cv_)
750                    __throw_bad_cast();
751
752                __extbufend_ = __extbufnext_ + __nr;
753                char_type*  __inext;
754                __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
755                                       this->eback() + __unget_sz,
756                                       this->eback() + __ibs_, __inext);
757                if (__r == codecvt_base::noconv)
758                {
759                    this->setg((char_type*)__extbuf_, (char_type*)__extbuf_,
760                                          (char_type*)const_cast<char *>(__extbufend_));
761                    __c = traits_type::to_int_type(*this->gptr());
762                }
763                else if (__inext != this->eback() + __unget_sz)
764                {
765                    this->setg(this->eback(), this->eback() + __unget_sz, __inext);
766                    __c = traits_type::to_int_type(*this->gptr());
767                }
768            }
769        }
770    }
771    else
772        __c = traits_type::to_int_type(*this->gptr());
773    if (this->eback() == &__1buf)
774        this->setg(0, 0, 0);
775    return __c;
776}
777
778template <class _CharT, class _Traits>
779typename basic_filebuf<_CharT, _Traits>::int_type
780basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
781{
782    if (__file_ && this->eback() < this->gptr())
783    {
784        if (traits_type::eq_int_type(__c, traits_type::eof()))
785        {
786            this->gbump(-1);
787            return traits_type::not_eof(__c);
788        }
789        if ((__om_ & ios_base::out) ||
790            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
791        {
792            this->gbump(-1);
793            *this->gptr() = traits_type::to_char_type(__c);
794            return __c;
795        }
796    }
797    return traits_type::eof();
798}
799
800template <class _CharT, class _Traits>
801typename basic_filebuf<_CharT, _Traits>::int_type
802basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
803{
804    if (__file_ == 0)
805        return traits_type::eof();
806    __write_mode();
807    char_type __1buf;
808    char_type* __pb_save = this->pbase();
809    char_type* __epb_save = this->epptr();
810    if (!traits_type::eq_int_type(__c, traits_type::eof()))
811    {
812        if (this->pptr() == 0)
813            this->setp(&__1buf, &__1buf+1);
814        *this->pptr() = traits_type::to_char_type(__c);
815        this->pbump(1);
816    }
817    if (this->pptr() != this->pbase())
818    {
819        if (__always_noconv_)
820        {
821            size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
822            if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
823                return traits_type::eof();
824        }
825        else
826        {
827            char* __extbe = __extbuf_;
828            codecvt_base::result __r;
829            do
830            {
831                if (!__cv_)
832                    __throw_bad_cast();
833
834                const char_type* __e;
835                __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e,
836                                        __extbuf_, __extbuf_ + __ebs_, __extbe);
837                if (__e == this->pbase())
838                    return traits_type::eof();
839                if (__r == codecvt_base::noconv)
840                {
841                    size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
842                    if (fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
843                        return traits_type::eof();
844                }
845                else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
846                {
847                    size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
848                    if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
849                        return traits_type::eof();
850                    if (__r == codecvt_base::partial)
851                    {
852                        this->setp(const_cast<char_type*>(__e), this->pptr());
853                        this->__pbump(this->epptr() - this->pbase());
854                    }
855                }
856                else
857                    return traits_type::eof();
858            } while (__r == codecvt_base::partial);
859        }
860        this->setp(__pb_save, __epb_save);
861    }
862    return traits_type::not_eof(__c);
863}
864
865template <class _CharT, class _Traits>
866basic_streambuf<_CharT, _Traits>*
867basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n)
868{
869    this->setg(0, 0, 0);
870    this->setp(0, 0);
871    if (__owns_eb_)
872        delete [] __extbuf_;
873    if (__owns_ib_)
874        delete [] __intbuf_;
875    __ebs_ = __n;
876    if (__ebs_ > sizeof(__extbuf_min_))
877    {
878        if (__always_noconv_ && __s)
879        {
880            __extbuf_ = (char*)__s;
881            __owns_eb_ = false;
882        }
883        else
884        {
885            __extbuf_ = new char[__ebs_];
886            __owns_eb_ = true;
887        }
888    }
889    else
890    {
891        __extbuf_ = __extbuf_min_;
892        __ebs_ = sizeof(__extbuf_min_);
893        __owns_eb_ = false;
894    }
895    if (!__always_noconv_)
896    {
897        __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
898        if (__s && __ibs_ >= sizeof(__extbuf_min_))
899        {
900            __intbuf_ = __s;
901            __owns_ib_ = false;
902        }
903        else
904        {
905            __intbuf_ = new char_type[__ibs_];
906            __owns_ib_ = true;
907        }
908    }
909    else
910    {
911        __ibs_ = 0;
912        __intbuf_ = 0;
913        __owns_ib_ = false;
914    }
915    return this;
916}
917
918template <class _CharT, class _Traits>
919typename basic_filebuf<_CharT, _Traits>::pos_type
920basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
921                                        ios_base::openmode)
922{
923    if (!__cv_)
924        __throw_bad_cast();
925
926    int __width = __cv_->encoding();
927    if (__file_ == 0 || (__width <= 0 && __off != 0) || sync())
928        return pos_type(off_type(-1));
929    // __width > 0 || __off == 0
930    int __whence;
931    switch (__way)
932    {
933    case ios_base::beg:
934        __whence = SEEK_SET;
935        break;
936    case ios_base::cur:
937        __whence = SEEK_CUR;
938        break;
939    case ios_base::end:
940        __whence = SEEK_END;
941        break;
942    default:
943        return pos_type(off_type(-1));
944    }
945#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
946    if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
947        return pos_type(off_type(-1));
948    pos_type __r = ftell(__file_);
949#else
950    if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
951        return pos_type(off_type(-1));
952    pos_type __r = ftello(__file_);
953#endif
954    __r.state(__st_);
955    return __r;
956}
957
958template <class _CharT, class _Traits>
959typename basic_filebuf<_CharT, _Traits>::pos_type
960basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
961{
962    if (__file_ == 0 || sync())
963        return pos_type(off_type(-1));
964#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
965    if (fseek(__file_, __sp, SEEK_SET))
966        return pos_type(off_type(-1));
967#else
968    if (fseeko(__file_, __sp, SEEK_SET))
969        return pos_type(off_type(-1));
970#endif
971    __st_ = __sp.state();
972    return __sp;
973}
974
975template <class _CharT, class _Traits>
976int
977basic_filebuf<_CharT, _Traits>::sync()
978{
979    if (__file_ == 0)
980        return 0;
981    if (!__cv_)
982        __throw_bad_cast();
983
984    if (__cm_ & ios_base::out)
985    {
986        if (this->pptr() != this->pbase())
987            if (overflow() == traits_type::eof())
988                return -1;
989        codecvt_base::result __r;
990        do
991        {
992            char* __extbe;
993            __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
994            size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
995            if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
996                return -1;
997        } while (__r == codecvt_base::partial);
998        if (__r == codecvt_base::error)
999            return -1;
1000        if (fflush(__file_))
1001            return -1;
1002    }
1003    else if (__cm_ & ios_base::in)
1004    {
1005        off_type __c;
1006        state_type __state = __st_last_;
1007        bool __update_st = false;
1008        if (__always_noconv_)
1009            __c = this->egptr() - this->gptr();
1010        else
1011        {
1012            int __width = __cv_->encoding();
1013            __c = __extbufend_ - __extbufnext_;
1014            if (__width > 0)
1015                __c += __width * (this->egptr() - this->gptr());
1016            else
1017            {
1018                if (this->gptr() != this->egptr())
1019                {
1020                    const int __off =  __cv_->length(__state, __extbuf_,
1021                                                     __extbufnext_,
1022                                                     this->gptr() - this->eback());
1023                    __c += __extbufnext_ - __extbuf_ - __off;
1024                    __update_st = true;
1025                }
1026            }
1027        }
1028#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
1029        if (fseek(__file_, -__c, SEEK_CUR))
1030            return -1;
1031#else
1032        if (fseeko(__file_, -__c, SEEK_CUR))
1033            return -1;
1034#endif
1035        if (__update_st)
1036            __st_ = __state;
1037        __extbufnext_ = __extbufend_ = __extbuf_;
1038        this->setg(0, 0, 0);
1039        __cm_ = 0;
1040    }
1041    return 0;
1042}
1043
1044template <class _CharT, class _Traits>
1045void
1046basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
1047{
1048    sync();
1049    __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
1050    bool __old_anc = __always_noconv_;
1051    __always_noconv_ = __cv_->always_noconv();
1052    if (__old_anc != __always_noconv_)
1053    {
1054        this->setg(0, 0, 0);
1055        this->setp(0, 0);
1056        // invariant, char_type is char, else we couldn't get here
1057        if (__always_noconv_)  // need to dump __intbuf_
1058        {
1059            if (__owns_eb_)
1060                delete [] __extbuf_;
1061            __owns_eb_ = __owns_ib_;
1062            __ebs_ = __ibs_;
1063            __extbuf_ = (char*)__intbuf_;
1064            __ibs_ = 0;
1065            __intbuf_ = 0;
1066            __owns_ib_ = false;
1067        }
1068        else  // need to obtain an __intbuf_.
1069        {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
1070            if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
1071            {
1072                __ibs_ = __ebs_;
1073                __intbuf_ = (char_type*)__extbuf_;
1074                __owns_ib_ = false;
1075                __extbuf_ = new char[__ebs_];
1076                __owns_eb_ = true;
1077            }
1078            else
1079            {
1080                __ibs_ = __ebs_;
1081                __intbuf_ = new char_type[__ibs_];
1082                __owns_ib_ = true;
1083            }
1084        }
1085    }
1086}
1087
1088template <class _CharT, class _Traits>
1089bool
1090basic_filebuf<_CharT, _Traits>::__read_mode()
1091{
1092    if (!(__cm_ & ios_base::in))
1093    {
1094        this->setp(0, 0);
1095        if (__always_noconv_)
1096            this->setg((char_type*)__extbuf_,
1097                       (char_type*)__extbuf_ + __ebs_,
1098                       (char_type*)__extbuf_ + __ebs_);
1099        else
1100            this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
1101        __cm_ = ios_base::in;
1102        return true;
1103    }
1104    return false;
1105}
1106
1107template <class _CharT, class _Traits>
1108void
1109basic_filebuf<_CharT, _Traits>::__write_mode()
1110{
1111    if (!(__cm_ & ios_base::out))
1112    {
1113        this->setg(0, 0, 0);
1114        if (__ebs_ > sizeof(__extbuf_min_))
1115        {
1116            if (__always_noconv_)
1117                this->setp((char_type*)__extbuf_,
1118                           (char_type*)__extbuf_ + (__ebs_ - 1));
1119            else
1120                this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
1121        }
1122        else
1123            this->setp(0, 0);
1124        __cm_ = ios_base::out;
1125    }
1126}
1127
1128// basic_ifstream
1129
1130template <class _CharT, class _Traits>
1131class _LIBCPP_TEMPLATE_VIS basic_ifstream
1132    : public basic_istream<_CharT, _Traits>
1133{
1134public:
1135    typedef _CharT                         char_type;
1136    typedef _Traits                        traits_type;
1137    typedef typename traits_type::int_type int_type;
1138    typedef typename traits_type::pos_type pos_type;
1139    typedef typename traits_type::off_type off_type;
1140
1141    _LIBCPP_INLINE_VISIBILITY
1142    basic_ifstream();
1143#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1144    _LIBCPP_INLINE_VISIBILITY
1145    explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1146#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1147    _LIBCPP_INLINE_VISIBILITY
1148    explicit basic_ifstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1149#endif
1150    _LIBCPP_INLINE_VISIBILITY
1151    explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1152#if _LIBCPP_STD_VER >= 17
1153    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1154    explicit basic_ifstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in)
1155      : basic_ifstream(__p.c_str(), __mode) {}
1156#endif // _LIBCPP_STD_VER >= 17
1157#endif
1158#ifndef _LIBCPP_CXX03_LANG
1159    _LIBCPP_INLINE_VISIBILITY
1160    basic_ifstream(basic_ifstream&& __rhs);
1161
1162    _LIBCPP_INLINE_VISIBILITY
1163    basic_ifstream& operator=(basic_ifstream&& __rhs);
1164#endif
1165    _LIBCPP_INLINE_VISIBILITY
1166    void swap(basic_ifstream& __rhs);
1167
1168    _LIBCPP_INLINE_VISIBILITY
1169    basic_filebuf<char_type, traits_type>* rdbuf() const;
1170    _LIBCPP_INLINE_VISIBILITY
1171    bool is_open() const;
1172#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1173    void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1174#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1175    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1176#endif
1177    void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1178#if _LIBCPP_STD_VER >= 17
1179    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1180    void open(const filesystem::path& __p,
1181              ios_base::openmode __mode = ios_base::in) {
1182      return open(__p.c_str(), __mode);
1183    }
1184#endif // _LIBCPP_STD_VER >= 17
1185
1186    _LIBCPP_INLINE_VISIBILITY
1187    void __open(int __fd, ios_base::openmode __mode);
1188#endif
1189    _LIBCPP_INLINE_VISIBILITY
1190    void close();
1191
1192private:
1193    basic_filebuf<char_type, traits_type> __sb_;
1194};
1195
1196template <class _CharT, class _Traits>
1197inline
1198basic_ifstream<_CharT, _Traits>::basic_ifstream()
1199    : basic_istream<char_type, traits_type>(&__sb_)
1200{
1201}
1202
1203#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1204template <class _CharT, class _Traits>
1205inline
1206basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1207    : basic_istream<char_type, traits_type>(&__sb_)
1208{
1209    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1210        this->setstate(ios_base::failbit);
1211}
1212
1213#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1214template <class _CharT, class _Traits>
1215inline
1216basic_ifstream<_CharT, _Traits>::basic_ifstream(const wchar_t* __s, ios_base::openmode __mode)
1217    : basic_istream<char_type, traits_type>(&__sb_)
1218{
1219    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1220        this->setstate(ios_base::failbit);
1221}
1222#endif
1223
1224template <class _CharT, class _Traits>
1225inline
1226basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1227    : basic_istream<char_type, traits_type>(&__sb_)
1228{
1229    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1230        this->setstate(ios_base::failbit);
1231}
1232#endif
1233
1234#ifndef _LIBCPP_CXX03_LANG
1235
1236template <class _CharT, class _Traits>
1237inline
1238basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1239    : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1240      __sb_(_VSTD::move(__rhs.__sb_))
1241{
1242    this->set_rdbuf(&__sb_);
1243}
1244
1245template <class _CharT, class _Traits>
1246inline
1247basic_ifstream<_CharT, _Traits>&
1248basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1249{
1250    basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1251    __sb_ = _VSTD::move(__rhs.__sb_);
1252    return *this;
1253}
1254
1255#endif  // _LIBCPP_CXX03_LANG
1256
1257template <class _CharT, class _Traits>
1258inline
1259void
1260basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1261{
1262    basic_istream<char_type, traits_type>::swap(__rhs);
1263    __sb_.swap(__rhs.__sb_);
1264}
1265
1266template <class _CharT, class _Traits>
1267inline _LIBCPP_INLINE_VISIBILITY
1268void
1269swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1270{
1271    __x.swap(__y);
1272}
1273
1274template <class _CharT, class _Traits>
1275inline
1276basic_filebuf<_CharT, _Traits>*
1277basic_ifstream<_CharT, _Traits>::rdbuf() const
1278{
1279    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1280}
1281
1282template <class _CharT, class _Traits>
1283inline
1284bool
1285basic_ifstream<_CharT, _Traits>::is_open() const
1286{
1287    return __sb_.is_open();
1288}
1289
1290#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1291template <class _CharT, class _Traits>
1292void
1293basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1294{
1295    if (__sb_.open(__s, __mode | ios_base::in))
1296        this->clear();
1297    else
1298        this->setstate(ios_base::failbit);
1299}
1300
1301#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1302template <class _CharT, class _Traits>
1303void
1304basic_ifstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1305{
1306    if (__sb_.open(__s, __mode | ios_base::in))
1307        this->clear();
1308    else
1309        this->setstate(ios_base::failbit);
1310}
1311#endif
1312
1313template <class _CharT, class _Traits>
1314void
1315basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1316{
1317    if (__sb_.open(__s, __mode | ios_base::in))
1318        this->clear();
1319    else
1320        this->setstate(ios_base::failbit);
1321}
1322
1323template <class _CharT, class _Traits>
1324void basic_ifstream<_CharT, _Traits>::__open(int __fd,
1325                                             ios_base::openmode __mode) {
1326  if (__sb_.__open(__fd, __mode | ios_base::in))
1327    this->clear();
1328  else
1329    this->setstate(ios_base::failbit);
1330}
1331#endif
1332
1333template <class _CharT, class _Traits>
1334inline
1335void
1336basic_ifstream<_CharT, _Traits>::close()
1337{
1338    if (__sb_.close() == 0)
1339        this->setstate(ios_base::failbit);
1340}
1341
1342// basic_ofstream
1343
1344template <class _CharT, class _Traits>
1345class _LIBCPP_TEMPLATE_VIS basic_ofstream
1346    : public basic_ostream<_CharT, _Traits>
1347{
1348public:
1349    typedef _CharT                         char_type;
1350    typedef _Traits                        traits_type;
1351    typedef typename traits_type::int_type int_type;
1352    typedef typename traits_type::pos_type pos_type;
1353    typedef typename traits_type::off_type off_type;
1354
1355    _LIBCPP_INLINE_VISIBILITY
1356    basic_ofstream();
1357    _LIBCPP_INLINE_VISIBILITY
1358    explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1359#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1360    _LIBCPP_INLINE_VISIBILITY
1361    explicit basic_ofstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1362#endif
1363    _LIBCPP_INLINE_VISIBILITY
1364    explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1365
1366#if _LIBCPP_STD_VER >= 17
1367    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1368    explicit basic_ofstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out)
1369      : basic_ofstream(__p.c_str(), __mode) {}
1370#endif // _LIBCPP_STD_VER >= 17
1371
1372#ifndef _LIBCPP_CXX03_LANG
1373    _LIBCPP_INLINE_VISIBILITY
1374    basic_ofstream(basic_ofstream&& __rhs);
1375
1376    _LIBCPP_INLINE_VISIBILITY
1377    basic_ofstream& operator=(basic_ofstream&& __rhs);
1378#endif
1379    _LIBCPP_INLINE_VISIBILITY
1380    void swap(basic_ofstream& __rhs);
1381
1382    _LIBCPP_INLINE_VISIBILITY
1383    basic_filebuf<char_type, traits_type>* rdbuf() const;
1384    _LIBCPP_INLINE_VISIBILITY
1385    bool is_open() const;
1386#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1387    void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1388#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1389    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1390#endif
1391    void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1392
1393#if _LIBCPP_STD_VER >= 17
1394    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1395    void open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out)
1396    { return open(__p.c_str(), __mode); }
1397#endif // _LIBCPP_STD_VER >= 17
1398
1399    _LIBCPP_INLINE_VISIBILITY
1400    void __open(int __fd, ios_base::openmode __mode);
1401#endif
1402    _LIBCPP_INLINE_VISIBILITY
1403    void close();
1404
1405private:
1406    basic_filebuf<char_type, traits_type> __sb_;
1407};
1408
1409template <class _CharT, class _Traits>
1410inline
1411basic_ofstream<_CharT, _Traits>::basic_ofstream()
1412    : basic_ostream<char_type, traits_type>(&__sb_)
1413{
1414}
1415
1416#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1417template <class _CharT, class _Traits>
1418inline
1419basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1420    : basic_ostream<char_type, traits_type>(&__sb_)
1421{
1422    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1423        this->setstate(ios_base::failbit);
1424}
1425
1426#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1427template <class _CharT, class _Traits>
1428inline
1429basic_ofstream<_CharT, _Traits>::basic_ofstream(const wchar_t* __s, ios_base::openmode __mode)
1430    : basic_ostream<char_type, traits_type>(&__sb_)
1431{
1432    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1433        this->setstate(ios_base::failbit);
1434}
1435#endif
1436
1437template <class _CharT, class _Traits>
1438inline
1439basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1440    : basic_ostream<char_type, traits_type>(&__sb_)
1441{
1442    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1443        this->setstate(ios_base::failbit);
1444}
1445#endif
1446
1447#ifndef _LIBCPP_CXX03_LANG
1448
1449template <class _CharT, class _Traits>
1450inline
1451basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1452    : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1453      __sb_(_VSTD::move(__rhs.__sb_))
1454{
1455    this->set_rdbuf(&__sb_);
1456}
1457
1458template <class _CharT, class _Traits>
1459inline
1460basic_ofstream<_CharT, _Traits>&
1461basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1462{
1463    basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1464    __sb_ = _VSTD::move(__rhs.__sb_);
1465    return *this;
1466}
1467
1468#endif  // _LIBCPP_CXX03_LANG
1469
1470template <class _CharT, class _Traits>
1471inline
1472void
1473basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1474{
1475    basic_ostream<char_type, traits_type>::swap(__rhs);
1476    __sb_.swap(__rhs.__sb_);
1477}
1478
1479template <class _CharT, class _Traits>
1480inline _LIBCPP_INLINE_VISIBILITY
1481void
1482swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1483{
1484    __x.swap(__y);
1485}
1486
1487template <class _CharT, class _Traits>
1488inline
1489basic_filebuf<_CharT, _Traits>*
1490basic_ofstream<_CharT, _Traits>::rdbuf() const
1491{
1492    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1493}
1494
1495template <class _CharT, class _Traits>
1496inline
1497bool
1498basic_ofstream<_CharT, _Traits>::is_open() const
1499{
1500    return __sb_.is_open();
1501}
1502
1503#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1504template <class _CharT, class _Traits>
1505void
1506basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1507{
1508    if (__sb_.open(__s, __mode | ios_base::out))
1509        this->clear();
1510    else
1511        this->setstate(ios_base::failbit);
1512}
1513
1514#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1515template <class _CharT, class _Traits>
1516void
1517basic_ofstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1518{
1519    if (__sb_.open(__s, __mode | ios_base::out))
1520        this->clear();
1521    else
1522        this->setstate(ios_base::failbit);
1523}
1524#endif
1525
1526template <class _CharT, class _Traits>
1527void
1528basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1529{
1530    if (__sb_.open(__s, __mode | ios_base::out))
1531        this->clear();
1532    else
1533        this->setstate(ios_base::failbit);
1534}
1535
1536template <class _CharT, class _Traits>
1537void basic_ofstream<_CharT, _Traits>::__open(int __fd,
1538                                             ios_base::openmode __mode) {
1539  if (__sb_.__open(__fd, __mode | ios_base::out))
1540    this->clear();
1541  else
1542    this->setstate(ios_base::failbit);
1543}
1544#endif
1545
1546template <class _CharT, class _Traits>
1547inline
1548void
1549basic_ofstream<_CharT, _Traits>::close()
1550{
1551    if (__sb_.close() == 0)
1552        this->setstate(ios_base::failbit);
1553}
1554
1555// basic_fstream
1556
1557template <class _CharT, class _Traits>
1558class _LIBCPP_TEMPLATE_VIS basic_fstream
1559    : public basic_iostream<_CharT, _Traits>
1560{
1561public:
1562    typedef _CharT                         char_type;
1563    typedef _Traits                        traits_type;
1564    typedef typename traits_type::int_type int_type;
1565    typedef typename traits_type::pos_type pos_type;
1566    typedef typename traits_type::off_type off_type;
1567
1568    _LIBCPP_INLINE_VISIBILITY
1569    basic_fstream();
1570#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1571    _LIBCPP_INLINE_VISIBILITY
1572    explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1573#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1574    _LIBCPP_INLINE_VISIBILITY
1575    explicit basic_fstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1576#endif
1577    _LIBCPP_INLINE_VISIBILITY
1578    explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1579
1580#if _LIBCPP_STD_VER >= 17
1581    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1582    explicit basic_fstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out)
1583      : basic_fstream(__p.c_str(), __mode) {}
1584#endif // _LIBCPP_STD_VER >= 17
1585
1586#endif
1587#ifndef _LIBCPP_CXX03_LANG
1588    _LIBCPP_INLINE_VISIBILITY
1589    basic_fstream(basic_fstream&& __rhs);
1590
1591    _LIBCPP_INLINE_VISIBILITY
1592    basic_fstream& operator=(basic_fstream&& __rhs);
1593#endif
1594    _LIBCPP_INLINE_VISIBILITY
1595    void swap(basic_fstream& __rhs);
1596
1597    _LIBCPP_INLINE_VISIBILITY
1598    basic_filebuf<char_type, traits_type>* rdbuf() const;
1599    _LIBCPP_INLINE_VISIBILITY
1600    bool is_open() const;
1601#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1602    void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1603#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1604    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1605#endif
1606    void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1607
1608#if _LIBCPP_STD_VER >= 17
1609    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1610    void open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in|ios_base::out)
1611    { return open(__p.c_str(), __mode); }
1612#endif // _LIBCPP_STD_VER >= 17
1613
1614#endif
1615    _LIBCPP_INLINE_VISIBILITY
1616    void close();
1617
1618private:
1619    basic_filebuf<char_type, traits_type> __sb_;
1620};
1621
1622template <class _CharT, class _Traits>
1623inline
1624basic_fstream<_CharT, _Traits>::basic_fstream()
1625    : basic_iostream<char_type, traits_type>(&__sb_)
1626{
1627}
1628
1629#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1630template <class _CharT, class _Traits>
1631inline
1632basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1633    : basic_iostream<char_type, traits_type>(&__sb_)
1634{
1635    if (__sb_.open(__s, __mode) == 0)
1636        this->setstate(ios_base::failbit);
1637}
1638
1639#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1640template <class _CharT, class _Traits>
1641inline
1642basic_fstream<_CharT, _Traits>::basic_fstream(const wchar_t* __s, ios_base::openmode __mode)
1643    : basic_iostream<char_type, traits_type>(&__sb_)
1644{
1645    if (__sb_.open(__s, __mode) == 0)
1646        this->setstate(ios_base::failbit);
1647}
1648#endif
1649
1650template <class _CharT, class _Traits>
1651inline
1652basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1653    : basic_iostream<char_type, traits_type>(&__sb_)
1654{
1655    if (__sb_.open(__s, __mode) == 0)
1656        this->setstate(ios_base::failbit);
1657}
1658#endif
1659
1660#ifndef _LIBCPP_CXX03_LANG
1661
1662template <class _CharT, class _Traits>
1663inline
1664basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1665    : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1666      __sb_(_VSTD::move(__rhs.__sb_))
1667{
1668    this->set_rdbuf(&__sb_);
1669}
1670
1671template <class _CharT, class _Traits>
1672inline
1673basic_fstream<_CharT, _Traits>&
1674basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1675{
1676    basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1677    __sb_ = _VSTD::move(__rhs.__sb_);
1678    return *this;
1679}
1680
1681#endif  // _LIBCPP_CXX03_LANG
1682
1683template <class _CharT, class _Traits>
1684inline
1685void
1686basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1687{
1688    basic_iostream<char_type, traits_type>::swap(__rhs);
1689    __sb_.swap(__rhs.__sb_);
1690}
1691
1692template <class _CharT, class _Traits>
1693inline _LIBCPP_INLINE_VISIBILITY
1694void
1695swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1696{
1697    __x.swap(__y);
1698}
1699
1700template <class _CharT, class _Traits>
1701inline
1702basic_filebuf<_CharT, _Traits>*
1703basic_fstream<_CharT, _Traits>::rdbuf() const
1704{
1705    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1706}
1707
1708template <class _CharT, class _Traits>
1709inline
1710bool
1711basic_fstream<_CharT, _Traits>::is_open() const
1712{
1713    return __sb_.is_open();
1714}
1715
1716#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1717template <class _CharT, class _Traits>
1718void
1719basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1720{
1721    if (__sb_.open(__s, __mode))
1722        this->clear();
1723    else
1724        this->setstate(ios_base::failbit);
1725}
1726
1727#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1728template <class _CharT, class _Traits>
1729void
1730basic_fstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1731{
1732    if (__sb_.open(__s, __mode))
1733        this->clear();
1734    else
1735        this->setstate(ios_base::failbit);
1736}
1737#endif
1738
1739template <class _CharT, class _Traits>
1740void
1741basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1742{
1743    if (__sb_.open(__s, __mode))
1744        this->clear();
1745    else
1746        this->setstate(ios_base::failbit);
1747}
1748#endif
1749
1750template <class _CharT, class _Traits>
1751inline
1752void
1753basic_fstream<_CharT, _Traits>::close()
1754{
1755    if (__sb_.close() == 0)
1756        this->setstate(ios_base::failbit);
1757}
1758
1759_LIBCPP_END_NAMESPACE_STD
1760
1761_LIBCPP_POP_MACROS
1762
1763#endif  // _LIBCPP_FSTREAM
1764