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 <__algorithm/max.h>
183#include <__assert>
184#include <__availability>
185#include <__config>
186#include <__locale>
187#include <__utility/unreachable.h>
188#include <cstdio>
189#include <cstdlib>
190#include <istream>
191#include <ostream>
192#include <version>
193
194#if !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
195#   include <filesystem>
196#endif
197
198#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
199#  pragma GCC system_header
200#endif
201
202_LIBCPP_PUSH_MACROS
203#include <__undef_macros>
204
205#if defined(_LIBCPP_MSVCRT) || defined(_NEWLIB_VERSION)
206#  define _LIBCPP_HAS_NO_OFF_T_FUNCTIONS
207#endif
208
209_LIBCPP_BEGIN_NAMESPACE_STD
210
211template <class _CharT, class _Traits>
212class _LIBCPP_TEMPLATE_VIS basic_filebuf
213    : public basic_streambuf<_CharT, _Traits>
214{
215public:
216    typedef _CharT                           char_type;
217    typedef _Traits                          traits_type;
218    typedef typename traits_type::int_type   int_type;
219    typedef typename traits_type::pos_type   pos_type;
220    typedef typename traits_type::off_type   off_type;
221    typedef typename traits_type::state_type state_type;
222
223    // 27.9.1.2 Constructors/destructor:
224    basic_filebuf();
225    basic_filebuf(basic_filebuf&& __rhs);
226    virtual ~basic_filebuf();
227
228    // 27.9.1.3 Assign/swap:
229    _LIBCPP_INLINE_VISIBILITY
230    basic_filebuf& operator=(basic_filebuf&& __rhs);
231    void swap(basic_filebuf& __rhs);
232
233    // 27.9.1.4 Members:
234    _LIBCPP_INLINE_VISIBILITY
235    bool is_open() const;
236    basic_filebuf* open(const char* __s, ios_base::openmode __mode);
237#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
238    basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode);
239#endif
240    _LIBCPP_INLINE_VISIBILITY
241    basic_filebuf* open(const string& __s, ios_base::openmode __mode);
242
243#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
244    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
245    basic_filebuf* open(const _VSTD_FS::path& __p, ios_base::openmode __mode) {
246      return open(__p.c_str(), __mode);
247    }
248#endif
249    _LIBCPP_INLINE_VISIBILITY
250    basic_filebuf* __open(int __fd, ios_base::openmode __mode);
251    basic_filebuf* close();
252
253    _LIBCPP_INLINE_VISIBILITY
254    inline static const char*
255    __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
256
257  protected:
258    // 27.9.1.5 Overridden virtual functions:
259    virtual int_type underflow();
260    virtual int_type pbackfail(int_type __c = traits_type::eof());
261    virtual int_type overflow (int_type __c = traits_type::eof());
262    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
263    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
264                             ios_base::openmode __wch = ios_base::in | ios_base::out);
265    virtual pos_type seekpos(pos_type __sp,
266                             ios_base::openmode __wch = ios_base::in | ios_base::out);
267    virtual int sync();
268    virtual void imbue(const locale& __loc);
269
270private:
271  char* __extbuf_;
272  const char* __extbufnext_;
273  const char* __extbufend_;
274  char __extbuf_min_[8];
275  size_t __ebs_;
276  char_type* __intbuf_;
277  size_t __ibs_;
278  FILE* __file_;
279  const codecvt<char_type, char, state_type>* __cv_;
280  state_type __st_;
281  state_type __st_last_;
282  ios_base::openmode __om_;
283  ios_base::openmode __cm_;
284  bool __owns_eb_;
285  bool __owns_ib_;
286  bool __always_noconv_;
287
288  bool __read_mode();
289  void __write_mode();
290};
291
292template <class _CharT, class _Traits>
293basic_filebuf<_CharT, _Traits>::basic_filebuf()
294    : __extbuf_(nullptr),
295      __extbufnext_(nullptr),
296      __extbufend_(nullptr),
297      __ebs_(0),
298      __intbuf_(nullptr),
299      __ibs_(0),
300      __file_(nullptr),
301      __cv_(nullptr),
302      __st_(),
303      __st_last_(),
304      __om_(0),
305      __cm_(0),
306      __owns_eb_(false),
307      __owns_ib_(false),
308      __always_noconv_(false)
309{
310    if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
311    {
312        __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
313        __always_noconv_ = __cv_->always_noconv();
314    }
315    setbuf(nullptr, 4096);
316}
317
318template <class _CharT, class _Traits>
319basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
320    : basic_streambuf<_CharT, _Traits>(__rhs)
321{
322    if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
323    {
324        __extbuf_ = __extbuf_min_;
325        __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
326        __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
327    }
328    else
329    {
330        __extbuf_ = __rhs.__extbuf_;
331        __extbufnext_ = __rhs.__extbufnext_;
332        __extbufend_ = __rhs.__extbufend_;
333    }
334    __ebs_ = __rhs.__ebs_;
335    __intbuf_ = __rhs.__intbuf_;
336    __ibs_ = __rhs.__ibs_;
337    __file_ = __rhs.__file_;
338    __cv_ = __rhs.__cv_;
339    __st_ = __rhs.__st_;
340    __st_last_ = __rhs.__st_last_;
341    __om_ = __rhs.__om_;
342    __cm_ = __rhs.__cm_;
343    __owns_eb_ = __rhs.__owns_eb_;
344    __owns_ib_ = __rhs.__owns_ib_;
345    __always_noconv_ = __rhs.__always_noconv_;
346    if (__rhs.pbase())
347    {
348        if (__rhs.pbase() == __rhs.__intbuf_)
349            this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
350        else
351            this->setp((char_type*)__extbuf_,
352                       (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
353        this->__pbump(__rhs. pptr() - __rhs.pbase());
354    }
355    else if (__rhs.eback())
356    {
357        if (__rhs.eback() == __rhs.__intbuf_)
358            this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
359                                  __intbuf_ + (__rhs.egptr() - __rhs.eback()));
360        else
361            this->setg((char_type*)__extbuf_,
362                       (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
363                       (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
364    }
365    __rhs.__extbuf_ = nullptr;
366    __rhs.__extbufnext_ = nullptr;
367    __rhs.__extbufend_ = nullptr;
368    __rhs.__ebs_ = 0;
369    __rhs.__intbuf_ = 0;
370    __rhs.__ibs_ = 0;
371    __rhs.__file_ = nullptr;
372    __rhs.__st_ = state_type();
373    __rhs.__st_last_ = state_type();
374    __rhs.__om_ = 0;
375    __rhs.__cm_ = 0;
376    __rhs.__owns_eb_ = false;
377    __rhs.__owns_ib_ = false;
378    __rhs.setg(0, 0, 0);
379    __rhs.setp(0, 0);
380}
381
382template <class _CharT, class _Traits>
383inline
384basic_filebuf<_CharT, _Traits>&
385basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
386{
387    close();
388    swap(__rhs);
389    return *this;
390}
391
392template <class _CharT, class _Traits>
393basic_filebuf<_CharT, _Traits>::~basic_filebuf()
394{
395#ifndef _LIBCPP_NO_EXCEPTIONS
396    try
397    {
398#endif // _LIBCPP_NO_EXCEPTIONS
399        close();
400#ifndef _LIBCPP_NO_EXCEPTIONS
401    }
402    catch (...)
403    {
404    }
405#endif // _LIBCPP_NO_EXCEPTIONS
406    if (__owns_eb_)
407        delete [] __extbuf_;
408    if (__owns_ib_)
409        delete [] __intbuf_;
410}
411
412template <class _CharT, class _Traits>
413void
414basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs)
415{
416    basic_streambuf<char_type, traits_type>::swap(__rhs);
417    if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
418    {
419        _VSTD::swap(__extbuf_, __rhs.__extbuf_);
420        _VSTD::swap(__extbufnext_, __rhs.__extbufnext_);
421        _VSTD::swap(__extbufend_, __rhs.__extbufend_);
422    }
423    else
424    {
425        ptrdiff_t __ln = __extbufnext_ - __extbuf_;
426        ptrdiff_t __le = __extbufend_ - __extbuf_;
427        ptrdiff_t __rn = __rhs.__extbufnext_ - __rhs.__extbuf_;
428        ptrdiff_t __re = __rhs.__extbufend_ - __rhs.__extbuf_;
429        if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
430        {
431            __extbuf_ = __rhs.__extbuf_;
432            __rhs.__extbuf_ = __rhs.__extbuf_min_;
433        }
434        else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_)
435        {
436            __rhs.__extbuf_ = __extbuf_;
437            __extbuf_ = __extbuf_min_;
438        }
439        __extbufnext_ = __extbuf_ + __rn;
440        __extbufend_ = __extbuf_ + __re;
441        __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
442        __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
443    }
444    _VSTD::swap(__ebs_, __rhs.__ebs_);
445    _VSTD::swap(__intbuf_, __rhs.__intbuf_);
446    _VSTD::swap(__ibs_, __rhs.__ibs_);
447    _VSTD::swap(__file_, __rhs.__file_);
448    _VSTD::swap(__cv_, __rhs.__cv_);
449    _VSTD::swap(__st_, __rhs.__st_);
450    _VSTD::swap(__st_last_, __rhs.__st_last_);
451    _VSTD::swap(__om_, __rhs.__om_);
452    _VSTD::swap(__cm_, __rhs.__cm_);
453    _VSTD::swap(__owns_eb_, __rhs.__owns_eb_);
454    _VSTD::swap(__owns_ib_, __rhs.__owns_ib_);
455    _VSTD::swap(__always_noconv_, __rhs.__always_noconv_);
456    if (this->eback() == (char_type*)__rhs.__extbuf_min_)
457    {
458        ptrdiff_t __n = this->gptr() - this->eback();
459        ptrdiff_t __e = this->egptr() - this->eback();
460        this->setg((char_type*)__extbuf_min_,
461                   (char_type*)__extbuf_min_ + __n,
462                   (char_type*)__extbuf_min_ + __e);
463    }
464    else if (this->pbase() == (char_type*)__rhs.__extbuf_min_)
465    {
466        ptrdiff_t __n = this->pptr() - this->pbase();
467        ptrdiff_t __e = this->epptr() - this->pbase();
468        this->setp((char_type*)__extbuf_min_,
469                   (char_type*)__extbuf_min_ + __e);
470        this->__pbump(__n);
471    }
472    if (__rhs.eback() == (char_type*)__extbuf_min_)
473    {
474        ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
475        ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
476        __rhs.setg((char_type*)__rhs.__extbuf_min_,
477                   (char_type*)__rhs.__extbuf_min_ + __n,
478                   (char_type*)__rhs.__extbuf_min_ + __e);
479    }
480    else if (__rhs.pbase() == (char_type*)__extbuf_min_)
481    {
482        ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
483        ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
484        __rhs.setp((char_type*)__rhs.__extbuf_min_,
485                   (char_type*)__rhs.__extbuf_min_ + __e);
486        __rhs.__pbump(__n);
487    }
488}
489
490template <class _CharT, class _Traits>
491inline _LIBCPP_INLINE_VISIBILITY
492void
493swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
494{
495    __x.swap(__y);
496}
497
498template <class _CharT, class _Traits>
499inline
500bool
501basic_filebuf<_CharT, _Traits>::is_open() const
502{
503    return __file_ != nullptr;
504}
505
506template <class _CharT, class _Traits>
507const char* basic_filebuf<_CharT, _Traits>::__make_mdstring(
508    ios_base::openmode __mode) _NOEXCEPT {
509  switch (__mode & ~ios_base::ate) {
510  case ios_base::out:
511  case ios_base::out | ios_base::trunc:
512    return "w" _LIBCPP_FOPEN_CLOEXEC_MODE;
513  case ios_base::out | ios_base::app:
514  case ios_base::app:
515    return "a" _LIBCPP_FOPEN_CLOEXEC_MODE;
516  case ios_base::in:
517    return "r" _LIBCPP_FOPEN_CLOEXEC_MODE;
518  case ios_base::in | ios_base::out:
519    return "r+" _LIBCPP_FOPEN_CLOEXEC_MODE;
520  case ios_base::in | ios_base::out | ios_base::trunc:
521    return "w+" _LIBCPP_FOPEN_CLOEXEC_MODE;
522  case ios_base::in | ios_base::out | ios_base::app:
523  case ios_base::in | ios_base::app:
524    return "a+" _LIBCPP_FOPEN_CLOEXEC_MODE;
525  case ios_base::out | ios_base::binary:
526  case ios_base::out | ios_base::trunc | ios_base::binary:
527    return "wb" _LIBCPP_FOPEN_CLOEXEC_MODE;
528  case ios_base::out | ios_base::app | ios_base::binary:
529  case ios_base::app | ios_base::binary:
530    return "ab" _LIBCPP_FOPEN_CLOEXEC_MODE;
531  case ios_base::in | ios_base::binary:
532    return "rb" _LIBCPP_FOPEN_CLOEXEC_MODE;
533  case ios_base::in | ios_base::out | ios_base::binary:
534    return "r+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
535  case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
536    return "w+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
537  case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
538  case ios_base::in | ios_base::app | ios_base::binary:
539    return "a+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
540  default:
541    return nullptr;
542  }
543  __libcpp_unreachable();
544}
545
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 = nullptr;
551    if (__file_ == nullptr)
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_ = nullptr;
562              __rt = nullptr;
563            }
564          }
565        } else
566          __rt = nullptr;
567      }
568    }
569    return __rt;
570}
571
572template <class _CharT, class _Traits>
573inline
574basic_filebuf<_CharT, _Traits>*
575basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
576  basic_filebuf<_CharT, _Traits>* __rt = nullptr;
577  if (__file_ == nullptr) {
578    if (const char* __mdstr = __make_mdstring(__mode)) {
579      __rt = this;
580      __file_ = fdopen(__fd, __mdstr);
581      if (__file_) {
582        __om_ = __mode;
583        if (__mode & ios_base::ate) {
584          if (fseek(__file_, 0, SEEK_END)) {
585            fclose(__file_);
586            __file_ = nullptr;
587            __rt = nullptr;
588          }
589        }
590      } else
591        __rt = nullptr;
592    }
593  }
594  return __rt;
595}
596
597#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
598// This is basically the same as the char* overload except that it uses _wfopen
599// and long mode strings.
600template <class _CharT, class _Traits>
601basic_filebuf<_CharT, _Traits>*
602basic_filebuf<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
603{
604    basic_filebuf<_CharT, _Traits>* __rt = nullptr;
605    if (__file_ == nullptr)
606    {
607        __rt = this;
608        const wchar_t* __mdstr;
609        switch (__mode & ~ios_base::ate)
610        {
611        case ios_base::out:
612        case ios_base::out | ios_base::trunc:
613            __mdstr = L"w";
614            break;
615        case ios_base::out | ios_base::app:
616        case ios_base::app:
617            __mdstr = L"a";
618            break;
619        case ios_base::in:
620            __mdstr = L"r";
621            break;
622        case ios_base::in | ios_base::out:
623            __mdstr = L"r+";
624            break;
625        case ios_base::in | ios_base::out | ios_base::trunc:
626            __mdstr = L"w+";
627            break;
628        case ios_base::in | ios_base::out | ios_base::app:
629        case ios_base::in | ios_base::app:
630            __mdstr = L"a+";
631            break;
632        case ios_base::out | ios_base::binary:
633        case ios_base::out | ios_base::trunc | ios_base::binary:
634            __mdstr = L"wb";
635            break;
636        case ios_base::out | ios_base::app | ios_base::binary:
637        case ios_base::app | ios_base::binary:
638            __mdstr = L"ab";
639            break;
640        case ios_base::in | ios_base::binary:
641            __mdstr = L"rb";
642            break;
643        case ios_base::in | ios_base::out | ios_base::binary:
644            __mdstr = L"r+b";
645            break;
646        case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
647            __mdstr = L"w+b";
648            break;
649        case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
650        case ios_base::in | ios_base::app | ios_base::binary:
651            __mdstr = L"a+b";
652            break;
653        default:
654            __rt = nullptr;
655            break;
656        }
657        if (__rt)
658        {
659            __file_ = _wfopen(__s, __mdstr);
660            if (__file_)
661            {
662                __om_ = __mode;
663                if (__mode & ios_base::ate)
664                {
665                    if (fseek(__file_, 0, SEEK_END))
666                    {
667                        fclose(__file_);
668                        __file_ = nullptr;
669                        __rt = nullptr;
670                    }
671                }
672            }
673            else
674                __rt = nullptr;
675        }
676    }
677    return __rt;
678}
679#endif
680
681template <class _CharT, class _Traits>
682inline
683basic_filebuf<_CharT, _Traits>*
684basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
685{
686    return open(__s.c_str(), __mode);
687}
688
689template <class _CharT, class _Traits>
690basic_filebuf<_CharT, _Traits>*
691basic_filebuf<_CharT, _Traits>::close()
692{
693    basic_filebuf<_CharT, _Traits>* __rt = nullptr;
694    if (__file_)
695    {
696        __rt = this;
697        unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
698        if (sync())
699            __rt = nullptr;
700        if (fclose(__h.release()))
701            __rt = nullptr;
702        __file_ = nullptr;
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_ == nullptr)
713        return traits_type::eof();
714    bool __initial = __read_mode();
715    char_type __1buf;
716    if (this->gptr() == nullptr)
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        _VSTD::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                _VSTD::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(nullptr, nullptr, nullptr);
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_ == nullptr)
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() == nullptr)
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(nullptr, nullptr, nullptr);
870    this->setp(nullptr, nullptr);
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_ = nullptr;
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_ == nullptr || (__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_ == nullptr || 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_ == nullptr)
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(nullptr, nullptr, nullptr);
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(nullptr, nullptr, nullptr);
1055        this->setp(nullptr, nullptr);
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_ = nullptr;
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(nullptr, nullptr);
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(nullptr, nullptr, nullptr);
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(nullptr, nullptr);
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    _LIBCPP_INLINE_VISIBILITY
1144    explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1145#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1146    _LIBCPP_INLINE_VISIBILITY
1147    explicit basic_ifstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1148#endif
1149    _LIBCPP_INLINE_VISIBILITY
1150    explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1151#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
1152    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1153    explicit basic_ifstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in)
1154      : basic_ifstream(__p.c_str(), __mode) {}
1155#endif // _LIBCPP_STD_VER >= 17
1156    _LIBCPP_INLINE_VISIBILITY
1157    basic_ifstream(basic_ifstream&& __rhs);
1158    _LIBCPP_INLINE_VISIBILITY
1159    basic_ifstream& operator=(basic_ifstream&& __rhs);
1160    _LIBCPP_INLINE_VISIBILITY
1161    void swap(basic_ifstream& __rhs);
1162
1163    _LIBCPP_INLINE_VISIBILITY
1164    basic_filebuf<char_type, traits_type>* rdbuf() const;
1165    _LIBCPP_INLINE_VISIBILITY
1166    bool is_open() const;
1167    void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1168#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1169    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
1170#endif
1171    void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1172#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
1173    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1174    void open(const filesystem::path& __p,
1175              ios_base::openmode __mode = ios_base::in) {
1176      return open(__p.c_str(), __mode);
1177    }
1178#endif // _LIBCPP_STD_VER >= 17
1179
1180    _LIBCPP_INLINE_VISIBILITY
1181    void __open(int __fd, ios_base::openmode __mode);
1182    _LIBCPP_INLINE_VISIBILITY
1183    void close();
1184
1185private:
1186    basic_filebuf<char_type, traits_type> __sb_;
1187};
1188
1189template <class _CharT, class _Traits>
1190inline
1191basic_ifstream<_CharT, _Traits>::basic_ifstream()
1192    : basic_istream<char_type, traits_type>(&__sb_)
1193{
1194}
1195
1196template <class _CharT, class _Traits>
1197inline
1198basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1199    : basic_istream<char_type, traits_type>(&__sb_)
1200{
1201    if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1202        this->setstate(ios_base::failbit);
1203}
1204
1205#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1206template <class _CharT, class _Traits>
1207inline
1208basic_ifstream<_CharT, _Traits>::basic_ifstream(const wchar_t* __s, ios_base::openmode __mode)
1209    : basic_istream<char_type, traits_type>(&__sb_)
1210{
1211    if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1212        this->setstate(ios_base::failbit);
1213}
1214#endif
1215
1216template <class _CharT, class _Traits>
1217inline
1218basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1219    : basic_istream<char_type, traits_type>(&__sb_)
1220{
1221    if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
1222        this->setstate(ios_base::failbit);
1223}
1224
1225template <class _CharT, class _Traits>
1226inline
1227basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1228    : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1229      __sb_(_VSTD::move(__rhs.__sb_))
1230{
1231    this->set_rdbuf(&__sb_);
1232}
1233
1234template <class _CharT, class _Traits>
1235inline
1236basic_ifstream<_CharT, _Traits>&
1237basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1238{
1239    basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1240    __sb_ = _VSTD::move(__rhs.__sb_);
1241    return *this;
1242}
1243
1244template <class _CharT, class _Traits>
1245inline
1246void
1247basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1248{
1249    basic_istream<char_type, traits_type>::swap(__rhs);
1250    __sb_.swap(__rhs.__sb_);
1251}
1252
1253template <class _CharT, class _Traits>
1254inline _LIBCPP_INLINE_VISIBILITY
1255void
1256swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1257{
1258    __x.swap(__y);
1259}
1260
1261template <class _CharT, class _Traits>
1262inline
1263basic_filebuf<_CharT, _Traits>*
1264basic_ifstream<_CharT, _Traits>::rdbuf() const
1265{
1266    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1267}
1268
1269template <class _CharT, class _Traits>
1270inline
1271bool
1272basic_ifstream<_CharT, _Traits>::is_open() const
1273{
1274    return __sb_.is_open();
1275}
1276
1277template <class _CharT, class _Traits>
1278void
1279basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1280{
1281    if (__sb_.open(__s, __mode | ios_base::in))
1282        this->clear();
1283    else
1284        this->setstate(ios_base::failbit);
1285}
1286
1287#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1288template <class _CharT, class _Traits>
1289void
1290basic_ifstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1291{
1292    if (__sb_.open(__s, __mode | ios_base::in))
1293        this->clear();
1294    else
1295        this->setstate(ios_base::failbit);
1296}
1297#endif
1298
1299template <class _CharT, class _Traits>
1300void
1301basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1302{
1303    if (__sb_.open(__s, __mode | ios_base::in))
1304        this->clear();
1305    else
1306        this->setstate(ios_base::failbit);
1307}
1308
1309template <class _CharT, class _Traits>
1310inline
1311void basic_ifstream<_CharT, _Traits>::__open(int __fd,
1312                                             ios_base::openmode __mode) {
1313  if (__sb_.__open(__fd, __mode | ios_base::in))
1314    this->clear();
1315  else
1316    this->setstate(ios_base::failbit);
1317}
1318
1319template <class _CharT, class _Traits>
1320inline
1321void
1322basic_ifstream<_CharT, _Traits>::close()
1323{
1324    if (__sb_.close() == 0)
1325        this->setstate(ios_base::failbit);
1326}
1327
1328// basic_ofstream
1329
1330template <class _CharT, class _Traits>
1331class _LIBCPP_TEMPLATE_VIS basic_ofstream
1332    : public basic_ostream<_CharT, _Traits>
1333{
1334public:
1335    typedef _CharT                         char_type;
1336    typedef _Traits                        traits_type;
1337    typedef typename traits_type::int_type int_type;
1338    typedef typename traits_type::pos_type pos_type;
1339    typedef typename traits_type::off_type off_type;
1340
1341    _LIBCPP_INLINE_VISIBILITY
1342    basic_ofstream();
1343    _LIBCPP_INLINE_VISIBILITY
1344    explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1345#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1346    _LIBCPP_INLINE_VISIBILITY
1347    explicit basic_ofstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1348#endif
1349    _LIBCPP_INLINE_VISIBILITY
1350    explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1351
1352#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
1353    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1354    explicit basic_ofstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out)
1355      : basic_ofstream(__p.c_str(), __mode) {}
1356#endif // _LIBCPP_STD_VER >= 17
1357
1358    _LIBCPP_INLINE_VISIBILITY
1359    basic_ofstream(basic_ofstream&& __rhs);
1360    _LIBCPP_INLINE_VISIBILITY
1361    basic_ofstream& operator=(basic_ofstream&& __rhs);
1362    _LIBCPP_INLINE_VISIBILITY
1363    void swap(basic_ofstream& __rhs);
1364
1365    _LIBCPP_INLINE_VISIBILITY
1366    basic_filebuf<char_type, traits_type>* rdbuf() const;
1367    _LIBCPP_INLINE_VISIBILITY
1368    bool is_open() const;
1369    void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1370#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1371    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
1372#endif
1373    void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1374
1375#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
1376    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1377    void open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out)
1378    { return open(__p.c_str(), __mode); }
1379#endif // _LIBCPP_STD_VER >= 17
1380
1381    _LIBCPP_INLINE_VISIBILITY
1382    void __open(int __fd, ios_base::openmode __mode);
1383    _LIBCPP_INLINE_VISIBILITY
1384    void close();
1385
1386private:
1387    basic_filebuf<char_type, traits_type> __sb_;
1388};
1389
1390template <class _CharT, class _Traits>
1391inline
1392basic_ofstream<_CharT, _Traits>::basic_ofstream()
1393    : basic_ostream<char_type, traits_type>(&__sb_)
1394{
1395}
1396
1397template <class _CharT, class _Traits>
1398inline
1399basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1400    : basic_ostream<char_type, traits_type>(&__sb_)
1401{
1402    if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1403        this->setstate(ios_base::failbit);
1404}
1405
1406#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1407template <class _CharT, class _Traits>
1408inline
1409basic_ofstream<_CharT, _Traits>::basic_ofstream(const wchar_t* __s, ios_base::openmode __mode)
1410    : basic_ostream<char_type, traits_type>(&__sb_)
1411{
1412    if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1413        this->setstate(ios_base::failbit);
1414}
1415#endif
1416
1417template <class _CharT, class _Traits>
1418inline
1419basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1420    : basic_ostream<char_type, traits_type>(&__sb_)
1421{
1422    if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
1423        this->setstate(ios_base::failbit);
1424}
1425
1426template <class _CharT, class _Traits>
1427inline
1428basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1429    : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1430      __sb_(_VSTD::move(__rhs.__sb_))
1431{
1432    this->set_rdbuf(&__sb_);
1433}
1434
1435template <class _CharT, class _Traits>
1436inline
1437basic_ofstream<_CharT, _Traits>&
1438basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1439{
1440    basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1441    __sb_ = _VSTD::move(__rhs.__sb_);
1442    return *this;
1443}
1444
1445template <class _CharT, class _Traits>
1446inline
1447void
1448basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1449{
1450    basic_ostream<char_type, traits_type>::swap(__rhs);
1451    __sb_.swap(__rhs.__sb_);
1452}
1453
1454template <class _CharT, class _Traits>
1455inline _LIBCPP_INLINE_VISIBILITY
1456void
1457swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1458{
1459    __x.swap(__y);
1460}
1461
1462template <class _CharT, class _Traits>
1463inline
1464basic_filebuf<_CharT, _Traits>*
1465basic_ofstream<_CharT, _Traits>::rdbuf() const
1466{
1467    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1468}
1469
1470template <class _CharT, class _Traits>
1471inline
1472bool
1473basic_ofstream<_CharT, _Traits>::is_open() const
1474{
1475    return __sb_.is_open();
1476}
1477
1478template <class _CharT, class _Traits>
1479void
1480basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1481{
1482    if (__sb_.open(__s, __mode | ios_base::out))
1483        this->clear();
1484    else
1485        this->setstate(ios_base::failbit);
1486}
1487
1488#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1489template <class _CharT, class _Traits>
1490void
1491basic_ofstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1492{
1493    if (__sb_.open(__s, __mode | ios_base::out))
1494        this->clear();
1495    else
1496        this->setstate(ios_base::failbit);
1497}
1498#endif
1499
1500template <class _CharT, class _Traits>
1501void
1502basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1503{
1504    if (__sb_.open(__s, __mode | ios_base::out))
1505        this->clear();
1506    else
1507        this->setstate(ios_base::failbit);
1508}
1509
1510template <class _CharT, class _Traits>
1511inline
1512void basic_ofstream<_CharT, _Traits>::__open(int __fd,
1513                                             ios_base::openmode __mode) {
1514  if (__sb_.__open(__fd, __mode | ios_base::out))
1515    this->clear();
1516  else
1517    this->setstate(ios_base::failbit);
1518}
1519
1520template <class _CharT, class _Traits>
1521inline
1522void
1523basic_ofstream<_CharT, _Traits>::close()
1524{
1525    if (__sb_.close() == nullptr)
1526        this->setstate(ios_base::failbit);
1527}
1528
1529// basic_fstream
1530
1531template <class _CharT, class _Traits>
1532class _LIBCPP_TEMPLATE_VIS basic_fstream
1533    : public basic_iostream<_CharT, _Traits>
1534{
1535public:
1536    typedef _CharT                         char_type;
1537    typedef _Traits                        traits_type;
1538    typedef typename traits_type::int_type int_type;
1539    typedef typename traits_type::pos_type pos_type;
1540    typedef typename traits_type::off_type off_type;
1541
1542    _LIBCPP_INLINE_VISIBILITY
1543    basic_fstream();
1544    _LIBCPP_INLINE_VISIBILITY
1545    explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1546#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1547    _LIBCPP_INLINE_VISIBILITY
1548    explicit basic_fstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1549#endif
1550    _LIBCPP_INLINE_VISIBILITY
1551    explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1552
1553#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
1554    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1555    explicit basic_fstream(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out)
1556      : basic_fstream(__p.c_str(), __mode) {}
1557#endif // _LIBCPP_STD_VER >= 17
1558
1559    _LIBCPP_INLINE_VISIBILITY
1560    basic_fstream(basic_fstream&& __rhs);
1561
1562    _LIBCPP_INLINE_VISIBILITY
1563    basic_fstream& operator=(basic_fstream&& __rhs);
1564
1565    _LIBCPP_INLINE_VISIBILITY
1566    void swap(basic_fstream& __rhs);
1567
1568    _LIBCPP_INLINE_VISIBILITY
1569    basic_filebuf<char_type, traits_type>* rdbuf() const;
1570    _LIBCPP_INLINE_VISIBILITY
1571    bool is_open() const;
1572    void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1573#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1574    void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1575#endif
1576    void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1577
1578#if _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
1579    _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
1580    void open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in|ios_base::out)
1581    { return open(__p.c_str(), __mode); }
1582#endif // _LIBCPP_STD_VER >= 17
1583
1584    _LIBCPP_INLINE_VISIBILITY
1585    void close();
1586
1587private:
1588    basic_filebuf<char_type, traits_type> __sb_;
1589};
1590
1591template <class _CharT, class _Traits>
1592inline
1593basic_fstream<_CharT, _Traits>::basic_fstream()
1594    : basic_iostream<char_type, traits_type>(&__sb_)
1595{
1596}
1597
1598template <class _CharT, class _Traits>
1599inline
1600basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1601    : basic_iostream<char_type, traits_type>(&__sb_)
1602{
1603    if (__sb_.open(__s, __mode) == nullptr)
1604        this->setstate(ios_base::failbit);
1605}
1606
1607#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1608template <class _CharT, class _Traits>
1609inline
1610basic_fstream<_CharT, _Traits>::basic_fstream(const wchar_t* __s, ios_base::openmode __mode)
1611    : basic_iostream<char_type, traits_type>(&__sb_)
1612{
1613    if (__sb_.open(__s, __mode) == nullptr)
1614        this->setstate(ios_base::failbit);
1615}
1616#endif
1617
1618template <class _CharT, class _Traits>
1619inline
1620basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1621    : basic_iostream<char_type, traits_type>(&__sb_)
1622{
1623    if (__sb_.open(__s, __mode) == nullptr)
1624        this->setstate(ios_base::failbit);
1625}
1626
1627template <class _CharT, class _Traits>
1628inline
1629basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1630    : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1631      __sb_(_VSTD::move(__rhs.__sb_))
1632{
1633    this->set_rdbuf(&__sb_);
1634}
1635
1636template <class _CharT, class _Traits>
1637inline
1638basic_fstream<_CharT, _Traits>&
1639basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1640{
1641    basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1642    __sb_ = _VSTD::move(__rhs.__sb_);
1643    return *this;
1644}
1645
1646template <class _CharT, class _Traits>
1647inline
1648void
1649basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1650{
1651    basic_iostream<char_type, traits_type>::swap(__rhs);
1652    __sb_.swap(__rhs.__sb_);
1653}
1654
1655template <class _CharT, class _Traits>
1656inline _LIBCPP_INLINE_VISIBILITY
1657void
1658swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1659{
1660    __x.swap(__y);
1661}
1662
1663template <class _CharT, class _Traits>
1664inline
1665basic_filebuf<_CharT, _Traits>*
1666basic_fstream<_CharT, _Traits>::rdbuf() const
1667{
1668    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1669}
1670
1671template <class _CharT, class _Traits>
1672inline
1673bool
1674basic_fstream<_CharT, _Traits>::is_open() const
1675{
1676    return __sb_.is_open();
1677}
1678
1679template <class _CharT, class _Traits>
1680void
1681basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1682{
1683    if (__sb_.open(__s, __mode))
1684        this->clear();
1685    else
1686        this->setstate(ios_base::failbit);
1687}
1688
1689#ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
1690template <class _CharT, class _Traits>
1691void
1692basic_fstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode)
1693{
1694    if (__sb_.open(__s, __mode))
1695        this->clear();
1696    else
1697        this->setstate(ios_base::failbit);
1698}
1699#endif
1700
1701template <class _CharT, class _Traits>
1702void
1703basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1704{
1705    if (__sb_.open(__s, __mode))
1706        this->clear();
1707    else
1708        this->setstate(ios_base::failbit);
1709}
1710
1711template <class _CharT, class _Traits>
1712inline
1713void
1714basic_fstream<_CharT, _Traits>::close()
1715{
1716    if (__sb_.close() == nullptr)
1717        this->setstate(ios_base::failbit);
1718}
1719
1720#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
1721_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>)
1722_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>)
1723_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>)
1724#endif
1725
1726_LIBCPP_END_NAMESPACE_STD
1727
1728_LIBCPP_POP_MACROS
1729
1730#endif // _LIBCPP_FSTREAM
1731