1// -*- C++ -*-
2//===------------------------- fstream ------------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_FSTREAM
12#define _LIBCPP_FSTREAM
13
14/*
15    fstream synopsis
16
17template <class charT, class traits = char_traits<charT> >
18class basic_filebuf
19    : public basic_streambuf<charT, traits>
20{
21public:
22    typedef charT                          char_type;
23    typedef traits                         traits_type;
24    typedef typename traits_type::int_type int_type;
25    typedef typename traits_type::pos_type pos_type;
26    typedef typename traits_type::off_type off_type;
27
28    // 27.9.1.2 Constructors/destructor:
29    basic_filebuf();
30    basic_filebuf(basic_filebuf&& rhs);
31    virtual ~basic_filebuf();
32
33    // 27.9.1.3 Assign/swap:
34    basic_filebuf& operator=(basic_filebuf&& rhs);
35    void swap(basic_filebuf& rhs);
36
37    // 27.9.1.4 Members:
38    bool is_open() const;
39    basic_filebuf* open(const char* s, ios_base::openmode mode);
40    basic_filebuf* open(const string& s, ios_base::openmode mode);
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    basic_ifstream(basic_ifstream&& rhs);
81
82    basic_ifstream& operator=(basic_ifstream&& rhs);
83    void swap(basic_ifstream& rhs);
84
85    basic_filebuf<char_type, traits_type>* rdbuf() const;
86    bool is_open() const;
87    void open(const char* s, ios_base::openmode mode = ios_base::in);
88    void open(const string& s, ios_base::openmode mode = ios_base::in);
89    void close();
90};
91
92template <class charT, class traits>
93  void
94  swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
95
96typedef basic_ifstream<char>    ifstream;
97typedef basic_ifstream<wchar_t> wifstream;
98
99template <class charT, class traits = char_traits<charT> >
100class basic_ofstream
101    : public basic_ostream<charT,traits>
102{
103public:
104    typedef charT                          char_type;
105    typedef traits                         traits_type;
106    typedef typename traits_type::int_type int_type;
107    typedef typename traits_type::pos_type pos_type;
108    typedef typename traits_type::off_type off_type;
109
110    basic_ofstream();
111    explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
112    explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
113    basic_ofstream(basic_ofstream&& rhs);
114
115    basic_ofstream& operator=(basic_ofstream&& rhs);
116    void swap(basic_ofstream& rhs);
117
118    basic_filebuf<char_type, traits_type>* rdbuf() const;
119    bool is_open() const;
120    void open(const char* s, ios_base::openmode mode = ios_base::out);
121    void open(const string& s, ios_base::openmode mode = ios_base::out);
122    void close();
123};
124
125template <class charT, class traits>
126  void
127  swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
128
129typedef basic_ofstream<char>    ofstream;
130typedef basic_ofstream<wchar_t> wofstream;
131
132template <class charT, class traits=char_traits<charT> >
133class basic_fstream
134    : public basic_iostream<charT,traits>
135{
136public:
137    typedef charT                          char_type;
138    typedef traits                         traits_type;
139    typedef typename traits_type::int_type int_type;
140    typedef typename traits_type::pos_type pos_type;
141    typedef typename traits_type::off_type off_type;
142
143    basic_fstream();
144    explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
145    explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
146    basic_fstream(basic_fstream&& rhs);
147
148    basic_fstream& operator=(basic_fstream&& rhs);
149    void swap(basic_fstream& rhs);
150
151    basic_filebuf<char_type, traits_type>* rdbuf() const;
152    bool is_open() const;
153    void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
154    void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
155    void close();
156};
157
158template <class charT, class traits>
159  void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
160
161typedef basic_fstream<char>    fstream;
162typedef basic_fstream<wchar_t> wfstream;
163
164}  // std
165
166*/
167
168#include <__config>
169#include <ostream>
170#include <istream>
171#include <__locale>
172#include <cstdio>
173
174#include <__undef_min_max>
175
176#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
177#pragma GCC system_header
178#endif
179
180_LIBCPP_BEGIN_NAMESPACE_STD
181
182template <class _CharT, class _Traits>
183class _LIBCPP_TYPE_VIS_ONLY basic_filebuf
184    : public basic_streambuf<_CharT, _Traits>
185{
186public:
187    typedef _CharT                           char_type;
188    typedef _Traits                          traits_type;
189    typedef typename traits_type::int_type   int_type;
190    typedef typename traits_type::pos_type   pos_type;
191    typedef typename traits_type::off_type   off_type;
192    typedef typename traits_type::state_type state_type;
193
194    // 27.9.1.2 Constructors/destructor:
195    basic_filebuf();
196#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
197    basic_filebuf(basic_filebuf&& __rhs);
198#endif
199    virtual ~basic_filebuf();
200
201    // 27.9.1.3 Assign/swap:
202#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
203    _LIBCPP_INLINE_VISIBILITY
204    basic_filebuf& operator=(basic_filebuf&& __rhs);
205#endif
206    void swap(basic_filebuf& __rhs);
207
208    // 27.9.1.4 Members:
209    _LIBCPP_INLINE_VISIBILITY
210    bool is_open() const;
211#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
212    basic_filebuf* open(const char* __s, ios_base::openmode __mode);
213    _LIBCPP_INLINE_VISIBILITY
214    basic_filebuf* open(const string& __s, ios_base::openmode __mode);
215#endif
216    basic_filebuf* close();
217
218protected:
219    // 27.9.1.5 Overridden virtual functions:
220    virtual int_type underflow();
221    virtual int_type pbackfail(int_type __c = traits_type::eof());
222    virtual int_type overflow (int_type __c = traits_type::eof());
223    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
224    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
225                             ios_base::openmode __wch = ios_base::in | ios_base::out);
226    virtual pos_type seekpos(pos_type __sp,
227                             ios_base::openmode __wch = ios_base::in | ios_base::out);
228    virtual int sync();
229    virtual void imbue(const locale& __loc);
230
231private:
232    char*       __extbuf_;
233    const char* __extbufnext_;
234    const char* __extbufend_;
235    char __extbuf_min_[8];
236    size_t __ebs_;
237    char_type* __intbuf_;
238    size_t __ibs_;
239    FILE* __file_;
240    const codecvt<char_type, char, state_type>* __cv_;
241    state_type __st_;
242    state_type __st_last_;
243    ios_base::openmode __om_;
244    ios_base::openmode __cm_;
245    bool __owns_eb_;
246    bool __owns_ib_;
247    bool __always_noconv_;
248
249    bool __read_mode();
250    void __write_mode();
251};
252
253template <class _CharT, class _Traits>
254basic_filebuf<_CharT, _Traits>::basic_filebuf()
255    : __extbuf_(0),
256      __extbufnext_(0),
257      __extbufend_(0),
258      __ebs_(0),
259      __intbuf_(0),
260      __ibs_(0),
261      __file_(0),
262      __cv_(nullptr),
263      __st_(),
264      __st_last_(),
265      __om_(0),
266      __cm_(0),
267      __owns_eb_(false),
268      __owns_ib_(false),
269      __always_noconv_(false)
270{
271    if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
272    {
273        __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
274        __always_noconv_ = __cv_->always_noconv();
275    }
276    setbuf(0, 4096);
277}
278
279#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
280
281template <class _CharT, class _Traits>
282basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
283    : basic_streambuf<_CharT, _Traits>(__rhs)
284{
285    if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
286    {
287        __extbuf_ = __extbuf_min_;
288        __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
289        __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
290    }
291    else
292    {
293        __extbuf_ = __rhs.__extbuf_;
294        __extbufnext_ = __rhs.__extbufnext_;
295        __extbufend_ = __rhs.__extbufend_;
296    }
297    __ebs_ = __rhs.__ebs_;
298    __intbuf_ = __rhs.__intbuf_;
299    __ibs_ = __rhs.__ibs_;
300    __file_ = __rhs.__file_;
301    __cv_ = __rhs.__cv_;
302    __st_ = __rhs.__st_;
303    __st_last_ = __rhs.__st_last_;
304    __om_ = __rhs.__om_;
305    __cm_ = __rhs.__cm_;
306    __owns_eb_ = __rhs.__owns_eb_;
307    __owns_ib_ = __rhs.__owns_ib_;
308    __always_noconv_ = __rhs.__always_noconv_;
309    if (__rhs.pbase())
310    {
311        if (__rhs.pbase() == __rhs.__intbuf_)
312            this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
313        else
314            this->setp((char_type*)__extbuf_,
315                       (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
316        this->pbump(__rhs. pptr() - __rhs.pbase());
317    }
318    else if (__rhs.eback())
319    {
320        if (__rhs.eback() == __rhs.__intbuf_)
321            this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
322                                  __intbuf_ + (__rhs.egptr() - __rhs.eback()));
323        else
324            this->setg((char_type*)__extbuf_,
325                       (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
326                       (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
327    }
328    __rhs.__extbuf_ = 0;
329    __rhs.__extbufnext_ = 0;
330    __rhs.__extbufend_ = 0;
331    __rhs.__ebs_ = 0;
332    __rhs.__intbuf_ = 0;
333    __rhs.__ibs_ = 0;
334    __rhs.__file_ = 0;
335    __rhs.__st_ = state_type();
336    __rhs.__st_last_ = state_type();
337    __rhs.__om_ = 0;
338    __rhs.__cm_ = 0;
339    __rhs.__owns_eb_ = false;
340    __rhs.__owns_ib_ = false;
341    __rhs.setg(0, 0, 0);
342    __rhs.setp(0, 0);
343}
344
345template <class _CharT, class _Traits>
346inline
347basic_filebuf<_CharT, _Traits>&
348basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
349{
350    close();
351    swap(__rhs);
352    return *this;
353}
354
355#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
356
357template <class _CharT, class _Traits>
358basic_filebuf<_CharT, _Traits>::~basic_filebuf()
359{
360#ifndef _LIBCPP_NO_EXCEPTIONS
361    try
362    {
363#endif  // _LIBCPP_NO_EXCEPTIONS
364        close();
365#ifndef _LIBCPP_NO_EXCEPTIONS
366    }
367    catch (...)
368    {
369    }
370#endif  // _LIBCPP_NO_EXCEPTIONS
371    if (__owns_eb_)
372        delete [] __extbuf_;
373    if (__owns_ib_)
374        delete [] __intbuf_;
375}
376
377template <class _CharT, class _Traits>
378void
379basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs)
380{
381    basic_streambuf<char_type, traits_type>::swap(__rhs);
382    if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
383    {
384        _VSTD::swap(__extbuf_, __rhs.__extbuf_);
385        _VSTD::swap(__extbufnext_, __rhs.__extbufnext_);
386        _VSTD::swap(__extbufend_, __rhs.__extbufend_);
387    }
388    else
389    {
390        ptrdiff_t __ln = __extbufnext_ - __extbuf_;
391        ptrdiff_t __le = __extbufend_ - __extbuf_;
392        ptrdiff_t __rn = __rhs.__extbufnext_ - __rhs.__extbuf_;
393        ptrdiff_t __re = __rhs.__extbufend_ - __rhs.__extbuf_;
394        if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
395        {
396            __extbuf_ = __rhs.__extbuf_;
397            __rhs.__extbuf_ = __rhs.__extbuf_min_;
398        }
399        else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_)
400        {
401            __rhs.__extbuf_ = __extbuf_;
402            __extbuf_ = __extbuf_min_;
403        }
404        __extbufnext_ = __extbuf_ + __rn;
405        __extbufend_ = __extbuf_ + __re;
406        __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
407        __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
408    }
409    _VSTD::swap(__ebs_, __rhs.__ebs_);
410    _VSTD::swap(__intbuf_, __rhs.__intbuf_);
411    _VSTD::swap(__ibs_, __rhs.__ibs_);
412    _VSTD::swap(__file_, __rhs.__file_);
413    _VSTD::swap(__cv_, __rhs.__cv_);
414    _VSTD::swap(__st_, __rhs.__st_);
415    _VSTD::swap(__st_last_, __rhs.__st_last_);
416    _VSTD::swap(__om_, __rhs.__om_);
417    _VSTD::swap(__cm_, __rhs.__cm_);
418    _VSTD::swap(__owns_eb_, __rhs.__owns_eb_);
419    _VSTD::swap(__owns_ib_, __rhs.__owns_ib_);
420    _VSTD::swap(__always_noconv_, __rhs.__always_noconv_);
421    if (this->eback() == (char_type*)__rhs.__extbuf_min_)
422    {
423        ptrdiff_t __n = this->gptr() - this->eback();
424        ptrdiff_t __e = this->egptr() - this->eback();
425        this->setg((char_type*)__extbuf_min_,
426                   (char_type*)__extbuf_min_ + __n,
427                   (char_type*)__extbuf_min_ + __e);
428    }
429    else if (this->pbase() == (char_type*)__rhs.__extbuf_min_)
430    {
431        ptrdiff_t __n = this->pptr() - this->pbase();
432        ptrdiff_t __e = this->epptr() - this->pbase();
433        this->setp((char_type*)__extbuf_min_,
434                   (char_type*)__extbuf_min_ + __e);
435        this->pbump(__n);
436    }
437    if (__rhs.eback() == (char_type*)__extbuf_min_)
438    {
439        ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
440        ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
441        __rhs.setg((char_type*)__rhs.__extbuf_min_,
442                   (char_type*)__rhs.__extbuf_min_ + __n,
443                   (char_type*)__rhs.__extbuf_min_ + __e);
444    }
445    else if (__rhs.pbase() == (char_type*)__extbuf_min_)
446    {
447        ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
448        ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
449        __rhs.setp((char_type*)__rhs.__extbuf_min_,
450                   (char_type*)__rhs.__extbuf_min_ + __e);
451        __rhs.pbump(__n);
452    }
453}
454
455template <class _CharT, class _Traits>
456inline _LIBCPP_INLINE_VISIBILITY
457void
458swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
459{
460    __x.swap(__y);
461}
462
463template <class _CharT, class _Traits>
464inline
465bool
466basic_filebuf<_CharT, _Traits>::is_open() const
467{
468    return __file_ != 0;
469}
470
471#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
472template <class _CharT, class _Traits>
473basic_filebuf<_CharT, _Traits>*
474basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
475{
476    basic_filebuf<_CharT, _Traits>* __rt = 0;
477    if (__file_ == 0)
478    {
479        __rt = this;
480        const char* __mdstr;
481        switch (__mode & ~ios_base::ate)
482        {
483        case ios_base::out:
484        case ios_base::out | ios_base::trunc:
485            __mdstr = "w";
486            break;
487        case ios_base::out | ios_base::app:
488        case ios_base::app:
489            __mdstr = "a";
490            break;
491        case ios_base::in:
492            __mdstr = "r";
493            break;
494        case ios_base::in | ios_base::out:
495            __mdstr = "r+";
496            break;
497        case ios_base::in | ios_base::out | ios_base::trunc:
498            __mdstr = "w+";
499            break;
500        case ios_base::in | ios_base::out | ios_base::app:
501        case ios_base::in | ios_base::app:
502            __mdstr = "a+";
503            break;
504        case ios_base::out | ios_base::binary:
505        case ios_base::out | ios_base::trunc | ios_base::binary:
506            __mdstr = "wb";
507            break;
508        case ios_base::out | ios_base::app | ios_base::binary:
509        case ios_base::app | ios_base::binary:
510            __mdstr = "ab";
511            break;
512        case ios_base::in | ios_base::binary:
513            __mdstr = "rb";
514            break;
515        case ios_base::in | ios_base::out | ios_base::binary:
516            __mdstr = "r+b";
517            break;
518        case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
519            __mdstr = "w+b";
520            break;
521        case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
522        case ios_base::in | ios_base::app | ios_base::binary:
523            __mdstr = "a+b";
524            break;
525        default:
526            __rt = 0;
527            break;
528        }
529        if (__rt)
530        {
531            __file_ = fopen(__s, __mdstr);
532            if (__file_)
533            {
534                __om_ = __mode;
535                if (__mode & ios_base::ate)
536                {
537                    if (fseek(__file_, 0, SEEK_END))
538                    {
539                        fclose(__file_);
540                        __file_ = 0;
541                        __rt = 0;
542                    }
543                }
544            }
545            else
546                __rt = 0;
547        }
548    }
549    return __rt;
550}
551
552template <class _CharT, class _Traits>
553inline
554basic_filebuf<_CharT, _Traits>*
555basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
556{
557    return open(__s.c_str(), __mode);
558}
559#endif
560
561template <class _CharT, class _Traits>
562basic_filebuf<_CharT, _Traits>*
563basic_filebuf<_CharT, _Traits>::close()
564{
565    basic_filebuf<_CharT, _Traits>* __rt = 0;
566    if (__file_)
567    {
568        __rt = this;
569        unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
570        if (sync())
571            __rt = 0;
572        if (fclose(__h.release()) == 0)
573            __file_ = 0;
574        else
575            __rt = 0;
576    }
577    return __rt;
578}
579
580template <class _CharT, class _Traits>
581typename basic_filebuf<_CharT, _Traits>::int_type
582basic_filebuf<_CharT, _Traits>::underflow()
583{
584    if (__file_ == 0)
585        return traits_type::eof();
586    bool __initial = __read_mode();
587    char_type __1buf;
588    if (this->gptr() == 0)
589        this->setg(&__1buf, &__1buf+1, &__1buf+1);
590    const size_t __unget_sz = __initial ? 0 : min<size_t>((this->egptr() - this->eback()) / 2, 4);
591    int_type __c = traits_type::eof();
592    if (this->gptr() == this->egptr())
593    {
594        memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
595        if (__always_noconv_)
596        {
597            size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
598            __nmemb = fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
599            if (__nmemb != 0)
600            {
601                this->setg(this->eback(),
602                           this->eback() + __unget_sz,
603                           this->eback() + __unget_sz + __nmemb);
604                __c = traits_type::to_int_type(*this->gptr());
605            }
606        }
607        else
608        {
609            memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
610            __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
611            __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
612            size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
613                                 static_cast<size_t>(__extbufend_ - __extbufnext_));
614            codecvt_base::result __r;
615            __st_last_ = __st_;
616            size_t __nr = fread((void*)__extbufnext_, 1, __nmemb, __file_);
617            if (__nr != 0)
618            {
619#ifndef _LIBCPP_NO_EXCEPTIONS
620                if (!__cv_)
621                    throw bad_cast();
622#endif
623                __extbufend_ = __extbufnext_ + __nr;
624                char_type*  __inext;
625                __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
626                                       this->eback() + __unget_sz,
627                                       this->eback() + __ibs_, __inext);
628                if (__r == codecvt_base::noconv)
629                {
630                    this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)__extbufend_);
631                    __c = traits_type::to_int_type(*this->gptr());
632                }
633                else if (__inext != this->eback() + __unget_sz)
634                {
635                    this->setg(this->eback(), this->eback() + __unget_sz, __inext);
636                    __c = traits_type::to_int_type(*this->gptr());
637                }
638            }
639        }
640    }
641    else
642        __c = traits_type::to_int_type(*this->gptr());
643    if (this->eback() == &__1buf)
644        this->setg(0, 0, 0);
645    return __c;
646}
647
648template <class _CharT, class _Traits>
649typename basic_filebuf<_CharT, _Traits>::int_type
650basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
651{
652    if (__file_ && this->eback() < this->gptr())
653    {
654        if (traits_type::eq_int_type(__c, traits_type::eof()))
655        {
656            this->gbump(-1);
657            return traits_type::not_eof(__c);
658        }
659        if ((__om_ & ios_base::out) ||
660            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
661        {
662            this->gbump(-1);
663            *this->gptr() = traits_type::to_char_type(__c);
664            return __c;
665        }
666    }
667    return traits_type::eof();
668}
669
670template <class _CharT, class _Traits>
671typename basic_filebuf<_CharT, _Traits>::int_type
672basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
673{
674    if (__file_ == 0)
675        return traits_type::eof();
676    __write_mode();
677    char_type __1buf;
678    char_type* __pb_save = this->pbase();
679    char_type* __epb_save = this->epptr();
680    if (!traits_type::eq_int_type(__c, traits_type::eof()))
681    {
682        if (this->pptr() == 0)
683            this->setp(&__1buf, &__1buf+1);
684        *this->pptr() = traits_type::to_char_type(__c);
685        this->pbump(1);
686    }
687    if (this->pptr() != this->pbase())
688    {
689        if (__always_noconv_)
690        {
691            size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
692            if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
693                return traits_type::eof();
694        }
695        else
696        {
697            char* __extbe = __extbuf_;
698            codecvt_base::result __r;
699            do
700            {
701#ifndef _LIBCPP_NO_EXCEPTIONS
702                if (!__cv_)
703                    throw bad_cast();
704#endif
705                const char_type* __e;
706                __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e,
707                                        __extbuf_, __extbuf_ + __ebs_, __extbe);
708                if (__e == this->pbase())
709                    return traits_type::eof();
710                if (__r == codecvt_base::noconv)
711                {
712                    size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
713                    if (fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
714                        return traits_type::eof();
715                }
716                else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
717                {
718                    size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
719                    if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
720                        return traits_type::eof();
721                    if (__r == codecvt_base::partial)
722                    {
723                        this->setp((char_type*)__e, this->pptr());
724                        this->pbump(this->epptr() - this->pbase());
725                    }
726                }
727                else
728                    return traits_type::eof();
729            } while (__r == codecvt_base::partial);
730        }
731        this->setp(__pb_save, __epb_save);
732    }
733    return traits_type::not_eof(__c);
734}
735
736template <class _CharT, class _Traits>
737basic_streambuf<_CharT, _Traits>*
738basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n)
739{
740    this->setg(0, 0, 0);
741    this->setp(0, 0);
742    if (__owns_eb_)
743        delete [] __extbuf_;
744    if (__owns_ib_)
745        delete [] __intbuf_;
746    __ebs_ = __n;
747    if (__ebs_ > sizeof(__extbuf_min_))
748    {
749        if (__always_noconv_ && __s)
750        {
751            __extbuf_ = (char*)__s;
752            __owns_eb_ = false;
753        }
754        else
755        {
756            __extbuf_ = new char[__ebs_];
757            __owns_eb_ = true;
758        }
759    }
760    else
761    {
762        __extbuf_ = __extbuf_min_;
763        __ebs_ = sizeof(__extbuf_min_);
764        __owns_eb_ = false;
765    }
766    if (!__always_noconv_)
767    {
768        __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
769        if (__s && __ibs_ >= sizeof(__extbuf_min_))
770        {
771            __intbuf_ = __s;
772            __owns_ib_ = false;
773        }
774        else
775        {
776            __intbuf_ = new char_type[__ibs_];
777            __owns_ib_ = true;
778        }
779    }
780    else
781    {
782        __ibs_ = 0;
783        __intbuf_ = 0;
784        __owns_ib_ = false;
785    }
786    return this;
787}
788
789template <class _CharT, class _Traits>
790typename basic_filebuf<_CharT, _Traits>::pos_type
791basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
792                                        ios_base::openmode)
793{
794#ifndef _LIBCPP_NO_EXCEPTIONS
795    if (!__cv_)
796        throw bad_cast();
797#endif
798    int __width = __cv_->encoding();
799    if (__file_ == 0 || (__width <= 0 && __off != 0) || sync())
800        return pos_type(off_type(-1));
801    // __width > 0 || __off == 0
802    int __whence;
803    switch (__way)
804    {
805    case ios_base::beg:
806        __whence = SEEK_SET;
807        break;
808    case ios_base::cur:
809        __whence = SEEK_CUR;
810        break;
811    case ios_base::end:
812        __whence = SEEK_END;
813        break;
814    default:
815        return pos_type(off_type(-1));
816    }
817#if defined(_WIN32) || defined(_NEWLIB_VERSION)
818    if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
819        return pos_type(off_type(-1));
820    pos_type __r = ftell(__file_);
821#else
822    if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
823        return pos_type(off_type(-1));
824    pos_type __r = ftello(__file_);
825#endif
826    __r.state(__st_);
827    return __r;
828}
829
830template <class _CharT, class _Traits>
831typename basic_filebuf<_CharT, _Traits>::pos_type
832basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
833{
834    if (__file_ == 0 || sync())
835        return pos_type(off_type(-1));
836#if defined(_WIN32) || defined(_NEWLIB_VERSION)
837    if (fseek(__file_, __sp, SEEK_SET))
838        return pos_type(off_type(-1));
839#else
840    if (fseeko(__file_, __sp, SEEK_SET))
841        return pos_type(off_type(-1));
842#endif
843    __st_ = __sp.state();
844    return __sp;
845}
846
847template <class _CharT, class _Traits>
848int
849basic_filebuf<_CharT, _Traits>::sync()
850{
851    if (__file_ == 0)
852        return 0;
853#ifndef _LIBCPP_NO_EXCEPTIONS
854    if (!__cv_)
855        throw bad_cast();
856#endif
857    if (__cm_ & ios_base::out)
858    {
859        if (this->pptr() != this->pbase())
860            if (overflow() == traits_type::eof())
861                return -1;
862        codecvt_base::result __r;
863        do
864        {
865            char* __extbe;
866            __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
867            size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
868            if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
869                return -1;
870        } while (__r == codecvt_base::partial);
871        if (__r == codecvt_base::error)
872            return -1;
873        if (fflush(__file_))
874            return -1;
875    }
876    else if (__cm_ & ios_base::in)
877    {
878        off_type __c;
879        state_type __state = __st_last_;
880        bool __update_st = false;
881        if (__always_noconv_)
882            __c = this->egptr() - this->gptr();
883        else
884        {
885            int __width = __cv_->encoding();
886            __c = __extbufend_ - __extbufnext_;
887            if (__width > 0)
888                __c += __width * (this->egptr() - this->gptr());
889            else
890            {
891                if (this->gptr() != this->egptr())
892                {
893                    const int __off =  __cv_->length(__state, __extbuf_,
894                                                     __extbufnext_,
895                                                     this->gptr() - this->eback());
896                    __c += __extbufnext_ - __extbuf_ - __off;
897                    __update_st = true;
898                }
899            }
900        }
901#if defined(_WIN32) || defined(_NEWLIB_VERSION)
902        if (fseek(__file_, -__c, SEEK_CUR))
903            return -1;
904#else
905        if (fseeko(__file_, -__c, SEEK_CUR))
906            return -1;
907#endif
908        if (__update_st)
909            __st_ = __state;
910        __extbufnext_ = __extbufend_ = __extbuf_;
911        this->setg(0, 0, 0);
912        __cm_ = 0;
913    }
914    return 0;
915}
916
917template <class _CharT, class _Traits>
918void
919basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
920{
921    sync();
922    __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
923    bool __old_anc = __always_noconv_;
924    __always_noconv_ = __cv_->always_noconv();
925    if (__old_anc != __always_noconv_)
926    {
927        this->setg(0, 0, 0);
928        this->setp(0, 0);
929        // invariant, char_type is char, else we couldn't get here
930        if (__always_noconv_)  // need to dump __intbuf_
931        {
932            if (__owns_eb_)
933                delete [] __extbuf_;
934            __owns_eb_ = __owns_ib_;
935            __ebs_ = __ibs_;
936            __extbuf_ = (char*)__intbuf_;
937            __ibs_ = 0;
938            __intbuf_ = 0;
939            __owns_ib_ = false;
940        }
941        else  // need to obtain an __intbuf_.
942        {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
943            if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
944            {
945                __ibs_ = __ebs_;
946                __intbuf_ = (char_type*)__extbuf_;
947                __owns_ib_ = false;
948                __extbuf_ = new char[__ebs_];
949                __owns_eb_ = true;
950            }
951            else
952            {
953                __ibs_ = __ebs_;
954                __intbuf_ = new char_type[__ibs_];
955                __owns_ib_ = true;
956            }
957        }
958    }
959}
960
961template <class _CharT, class _Traits>
962bool
963basic_filebuf<_CharT, _Traits>::__read_mode()
964{
965    if (!(__cm_ & ios_base::in))
966    {
967        this->setp(0, 0);
968        if (__always_noconv_)
969            this->setg((char_type*)__extbuf_,
970                       (char_type*)__extbuf_ + __ebs_,
971                       (char_type*)__extbuf_ + __ebs_);
972        else
973            this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
974        __cm_ = ios_base::in;
975        return true;
976    }
977    return false;
978}
979
980template <class _CharT, class _Traits>
981void
982basic_filebuf<_CharT, _Traits>::__write_mode()
983{
984    if (!(__cm_ & ios_base::out))
985    {
986        this->setg(0, 0, 0);
987        if (__ebs_ > sizeof(__extbuf_min_))
988        {
989            if (__always_noconv_)
990                this->setp((char_type*)__extbuf_,
991                           (char_type*)__extbuf_ + (__ebs_ - 1));
992            else
993                this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
994        }
995        else
996            this->setp(0, 0);
997        __cm_ = ios_base::out;
998    }
999}
1000
1001// basic_ifstream
1002
1003template <class _CharT, class _Traits>
1004class _LIBCPP_TYPE_VIS_ONLY basic_ifstream
1005    : public basic_istream<_CharT, _Traits>
1006{
1007public:
1008    typedef _CharT                         char_type;
1009    typedef _Traits                        traits_type;
1010    typedef typename traits_type::int_type int_type;
1011    typedef typename traits_type::pos_type pos_type;
1012    typedef typename traits_type::off_type off_type;
1013
1014    _LIBCPP_INLINE_VISIBILITY
1015    basic_ifstream();
1016#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1017    _LIBCPP_INLINE_VISIBILITY
1018    explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1019    _LIBCPP_INLINE_VISIBILITY
1020    explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1021#endif
1022#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1023    _LIBCPP_INLINE_VISIBILITY
1024    basic_ifstream(basic_ifstream&& __rhs);
1025#endif
1026
1027#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1028    _LIBCPP_INLINE_VISIBILITY
1029    basic_ifstream& operator=(basic_ifstream&& __rhs);
1030#endif
1031    _LIBCPP_INLINE_VISIBILITY
1032    void swap(basic_ifstream& __rhs);
1033
1034    _LIBCPP_INLINE_VISIBILITY
1035    basic_filebuf<char_type, traits_type>* rdbuf() const;
1036    _LIBCPP_INLINE_VISIBILITY
1037    bool is_open() const;
1038#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1039    void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1040    void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1041#endif
1042    _LIBCPP_INLINE_VISIBILITY
1043    void close();
1044
1045private:
1046    basic_filebuf<char_type, traits_type> __sb_;
1047};
1048
1049template <class _CharT, class _Traits>
1050inline
1051basic_ifstream<_CharT, _Traits>::basic_ifstream()
1052    : basic_istream<char_type, traits_type>(&__sb_)
1053{
1054}
1055
1056#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1057template <class _CharT, class _Traits>
1058inline
1059basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1060    : basic_istream<char_type, traits_type>(&__sb_)
1061{
1062    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1063        this->setstate(ios_base::failbit);
1064}
1065
1066template <class _CharT, class _Traits>
1067inline
1068basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1069    : basic_istream<char_type, traits_type>(&__sb_)
1070{
1071    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1072        this->setstate(ios_base::failbit);
1073}
1074#endif
1075
1076#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1077
1078template <class _CharT, class _Traits>
1079inline
1080basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1081    : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1082      __sb_(_VSTD::move(__rhs.__sb_))
1083{
1084    this->set_rdbuf(&__sb_);
1085}
1086
1087template <class _CharT, class _Traits>
1088inline
1089basic_ifstream<_CharT, _Traits>&
1090basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1091{
1092    basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1093    __sb_ = _VSTD::move(__rhs.__sb_);
1094    return *this;
1095}
1096
1097#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1098
1099template <class _CharT, class _Traits>
1100inline
1101void
1102basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1103{
1104    basic_istream<char_type, traits_type>::swap(__rhs);
1105    __sb_.swap(__rhs.__sb_);
1106}
1107
1108template <class _CharT, class _Traits>
1109inline _LIBCPP_INLINE_VISIBILITY
1110void
1111swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1112{
1113    __x.swap(__y);
1114}
1115
1116template <class _CharT, class _Traits>
1117inline
1118basic_filebuf<_CharT, _Traits>*
1119basic_ifstream<_CharT, _Traits>::rdbuf() const
1120{
1121    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1122}
1123
1124template <class _CharT, class _Traits>
1125inline
1126bool
1127basic_ifstream<_CharT, _Traits>::is_open() const
1128{
1129    return __sb_.is_open();
1130}
1131
1132#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1133template <class _CharT, class _Traits>
1134void
1135basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1136{
1137    if (__sb_.open(__s, __mode | ios_base::in))
1138        this->clear();
1139    else
1140        this->setstate(ios_base::failbit);
1141}
1142
1143template <class _CharT, class _Traits>
1144void
1145basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1146{
1147    if (__sb_.open(__s, __mode | ios_base::in))
1148        this->clear();
1149    else
1150        this->setstate(ios_base::failbit);
1151}
1152#endif
1153
1154template <class _CharT, class _Traits>
1155inline
1156void
1157basic_ifstream<_CharT, _Traits>::close()
1158{
1159    if (__sb_.close() == 0)
1160        this->setstate(ios_base::failbit);
1161}
1162
1163// basic_ofstream
1164
1165template <class _CharT, class _Traits>
1166class _LIBCPP_TYPE_VIS_ONLY basic_ofstream
1167    : public basic_ostream<_CharT, _Traits>
1168{
1169public:
1170    typedef _CharT                         char_type;
1171    typedef _Traits                        traits_type;
1172    typedef typename traits_type::int_type int_type;
1173    typedef typename traits_type::pos_type pos_type;
1174    typedef typename traits_type::off_type off_type;
1175
1176    _LIBCPP_INLINE_VISIBILITY
1177    basic_ofstream();
1178    _LIBCPP_INLINE_VISIBILITY
1179    explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1180    _LIBCPP_INLINE_VISIBILITY
1181    explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1182#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1183    _LIBCPP_INLINE_VISIBILITY
1184    basic_ofstream(basic_ofstream&& __rhs);
1185#endif
1186
1187#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1188    _LIBCPP_INLINE_VISIBILITY
1189    basic_ofstream& operator=(basic_ofstream&& __rhs);
1190#endif
1191    _LIBCPP_INLINE_VISIBILITY
1192    void swap(basic_ofstream& __rhs);
1193
1194    _LIBCPP_INLINE_VISIBILITY
1195    basic_filebuf<char_type, traits_type>* rdbuf() const;
1196    _LIBCPP_INLINE_VISIBILITY
1197    bool is_open() const;
1198#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1199    void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1200    void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1201#endif
1202    _LIBCPP_INLINE_VISIBILITY
1203    void close();
1204
1205private:
1206    basic_filebuf<char_type, traits_type> __sb_;
1207};
1208
1209template <class _CharT, class _Traits>
1210inline
1211basic_ofstream<_CharT, _Traits>::basic_ofstream()
1212    : basic_ostream<char_type, traits_type>(&__sb_)
1213{
1214}
1215
1216#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1217template <class _CharT, class _Traits>
1218inline
1219basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1220    : basic_ostream<char_type, traits_type>(&__sb_)
1221{
1222    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1223        this->setstate(ios_base::failbit);
1224}
1225
1226template <class _CharT, class _Traits>
1227inline
1228basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1229    : basic_ostream<char_type, traits_type>(&__sb_)
1230{
1231    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1232        this->setstate(ios_base::failbit);
1233}
1234#endif
1235
1236#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1237
1238template <class _CharT, class _Traits>
1239inline
1240basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1241    : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1242      __sb_(_VSTD::move(__rhs.__sb_))
1243{
1244    this->set_rdbuf(&__sb_);
1245}
1246
1247template <class _CharT, class _Traits>
1248inline
1249basic_ofstream<_CharT, _Traits>&
1250basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1251{
1252    basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1253    __sb_ = _VSTD::move(__rhs.__sb_);
1254    return *this;
1255}
1256
1257#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1258
1259template <class _CharT, class _Traits>
1260inline
1261void
1262basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1263{
1264    basic_ostream<char_type, traits_type>::swap(__rhs);
1265    __sb_.swap(__rhs.__sb_);
1266}
1267
1268template <class _CharT, class _Traits>
1269inline _LIBCPP_INLINE_VISIBILITY
1270void
1271swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1272{
1273    __x.swap(__y);
1274}
1275
1276template <class _CharT, class _Traits>
1277inline
1278basic_filebuf<_CharT, _Traits>*
1279basic_ofstream<_CharT, _Traits>::rdbuf() const
1280{
1281    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1282}
1283
1284template <class _CharT, class _Traits>
1285inline
1286bool
1287basic_ofstream<_CharT, _Traits>::is_open() const
1288{
1289    return __sb_.is_open();
1290}
1291
1292#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1293template <class _CharT, class _Traits>
1294void
1295basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1296{
1297    if (__sb_.open(__s, __mode | ios_base::out))
1298        this->clear();
1299    else
1300        this->setstate(ios_base::failbit);
1301}
1302
1303template <class _CharT, class _Traits>
1304void
1305basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1306{
1307    if (__sb_.open(__s, __mode | ios_base::out))
1308        this->clear();
1309    else
1310        this->setstate(ios_base::failbit);
1311}
1312#endif
1313
1314template <class _CharT, class _Traits>
1315inline
1316void
1317basic_ofstream<_CharT, _Traits>::close()
1318{
1319    if (__sb_.close() == 0)
1320        this->setstate(ios_base::failbit);
1321}
1322
1323// basic_fstream
1324
1325template <class _CharT, class _Traits>
1326class _LIBCPP_TYPE_VIS_ONLY basic_fstream
1327    : public basic_iostream<_CharT, _Traits>
1328{
1329public:
1330    typedef _CharT                         char_type;
1331    typedef _Traits                        traits_type;
1332    typedef typename traits_type::int_type int_type;
1333    typedef typename traits_type::pos_type pos_type;
1334    typedef typename traits_type::off_type off_type;
1335
1336    _LIBCPP_INLINE_VISIBILITY
1337    basic_fstream();
1338#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1339    _LIBCPP_INLINE_VISIBILITY
1340    explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1341    _LIBCPP_INLINE_VISIBILITY
1342    explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1343#endif
1344#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1345    _LIBCPP_INLINE_VISIBILITY
1346    basic_fstream(basic_fstream&& __rhs);
1347#endif
1348
1349#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1350    _LIBCPP_INLINE_VISIBILITY
1351    basic_fstream& operator=(basic_fstream&& __rhs);
1352#endif
1353    _LIBCPP_INLINE_VISIBILITY
1354    void swap(basic_fstream& __rhs);
1355
1356    _LIBCPP_INLINE_VISIBILITY
1357    basic_filebuf<char_type, traits_type>* rdbuf() const;
1358    _LIBCPP_INLINE_VISIBILITY
1359    bool is_open() const;
1360#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1361    void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1362    void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1363#endif
1364    _LIBCPP_INLINE_VISIBILITY
1365    void close();
1366
1367private:
1368    basic_filebuf<char_type, traits_type> __sb_;
1369};
1370
1371template <class _CharT, class _Traits>
1372inline
1373basic_fstream<_CharT, _Traits>::basic_fstream()
1374    : basic_iostream<char_type, traits_type>(&__sb_)
1375{
1376}
1377
1378#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1379template <class _CharT, class _Traits>
1380inline
1381basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1382    : basic_iostream<char_type, traits_type>(&__sb_)
1383{
1384    if (__sb_.open(__s, __mode) == 0)
1385        this->setstate(ios_base::failbit);
1386}
1387
1388template <class _CharT, class _Traits>
1389inline
1390basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1391    : basic_iostream<char_type, traits_type>(&__sb_)
1392{
1393    if (__sb_.open(__s, __mode) == 0)
1394        this->setstate(ios_base::failbit);
1395}
1396#endif
1397
1398#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1399
1400template <class _CharT, class _Traits>
1401inline
1402basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1403    : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1404      __sb_(_VSTD::move(__rhs.__sb_))
1405{
1406    this->set_rdbuf(&__sb_);
1407}
1408
1409template <class _CharT, class _Traits>
1410inline
1411basic_fstream<_CharT, _Traits>&
1412basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1413{
1414    basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1415    __sb_ = _VSTD::move(__rhs.__sb_);
1416    return *this;
1417}
1418
1419#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1420
1421template <class _CharT, class _Traits>
1422inline
1423void
1424basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1425{
1426    basic_iostream<char_type, traits_type>::swap(__rhs);
1427    __sb_.swap(__rhs.__sb_);
1428}
1429
1430template <class _CharT, class _Traits>
1431inline _LIBCPP_INLINE_VISIBILITY
1432void
1433swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1434{
1435    __x.swap(__y);
1436}
1437
1438template <class _CharT, class _Traits>
1439inline
1440basic_filebuf<_CharT, _Traits>*
1441basic_fstream<_CharT, _Traits>::rdbuf() const
1442{
1443    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1444}
1445
1446template <class _CharT, class _Traits>
1447inline
1448bool
1449basic_fstream<_CharT, _Traits>::is_open() const
1450{
1451    return __sb_.is_open();
1452}
1453
1454#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1455template <class _CharT, class _Traits>
1456void
1457basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1458{
1459    if (__sb_.open(__s, __mode))
1460        this->clear();
1461    else
1462        this->setstate(ios_base::failbit);
1463}
1464
1465template <class _CharT, class _Traits>
1466void
1467basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1468{
1469    if (__sb_.open(__s, __mode))
1470        this->clear();
1471    else
1472        this->setstate(ios_base::failbit);
1473}
1474#endif
1475
1476template <class _CharT, class _Traits>
1477inline
1478void
1479basic_fstream<_CharT, _Traits>::close()
1480{
1481    if (__sb_.close() == 0)
1482        this->setstate(ios_base::failbit);
1483}
1484
1485_LIBCPP_END_NAMESPACE_STD
1486
1487#endif  // _LIBCPP_FSTREAM
1488