xref: /freebsd-12.1/contrib/libc++/include/fstream (revision 540d2a8b) 
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_TEMPLATE_VIS 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_CXX03_LANG
197    basic_filebuf(basic_filebuf&& __rhs);
198#endif
199    virtual ~basic_filebuf();
200
201    // 27.9.1.3 Assign/swap:
202#ifndef _LIBCPP_CXX03_LANG
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_CXX03_LANG
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_CXX03_LANG
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            _LIBCPP_ASSERT ( !(__extbufnext_ == NULL && (__extbufend_ != __extbufnext_)), "underflow moving from NULL" );
610            if (__extbufend_ != __extbufnext_)
611                memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
612            __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
613            __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
614            size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
615                                 static_cast<size_t>(__extbufend_ - __extbufnext_));
616            codecvt_base::result __r;
617            __st_last_ = __st_;
618            size_t __nr = fread((void*)__extbufnext_, 1, __nmemb, __file_);
619            if (__nr != 0)
620            {
621                if (!__cv_)
622                    __throw_bad_cast();
623
624                __extbufend_ = __extbufnext_ + __nr;
625                char_type*  __inext;
626                __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
627                                       this->eback() + __unget_sz,
628                                       this->eback() + __ibs_, __inext);
629                if (__r == codecvt_base::noconv)
630                {
631                    this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)__extbufend_);
632                    __c = traits_type::to_int_type(*this->gptr());
633                }
634                else if (__inext != this->eback() + __unget_sz)
635                {
636                    this->setg(this->eback(), this->eback() + __unget_sz, __inext);
637                    __c = traits_type::to_int_type(*this->gptr());
638                }
639            }
640        }
641    }
642    else
643        __c = traits_type::to_int_type(*this->gptr());
644    if (this->eback() == &__1buf)
645        this->setg(0, 0, 0);
646    return __c;
647}
648
649template <class _CharT, class _Traits>
650typename basic_filebuf<_CharT, _Traits>::int_type
651basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
652{
653    if (__file_ && this->eback() < this->gptr())
654    {
655        if (traits_type::eq_int_type(__c, traits_type::eof()))
656        {
657            this->gbump(-1);
658            return traits_type::not_eof(__c);
659        }
660        if ((__om_ & ios_base::out) ||
661            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
662        {
663            this->gbump(-1);
664            *this->gptr() = traits_type::to_char_type(__c);
665            return __c;
666        }
667    }
668    return traits_type::eof();
669}
670
671template <class _CharT, class _Traits>
672typename basic_filebuf<_CharT, _Traits>::int_type
673basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
674{
675    if (__file_ == 0)
676        return traits_type::eof();
677    __write_mode();
678    char_type __1buf;
679    char_type* __pb_save = this->pbase();
680    char_type* __epb_save = this->epptr();
681    if (!traits_type::eq_int_type(__c, traits_type::eof()))
682    {
683        if (this->pptr() == 0)
684            this->setp(&__1buf, &__1buf+1);
685        *this->pptr() = traits_type::to_char_type(__c);
686        this->pbump(1);
687    }
688    if (this->pptr() != this->pbase())
689    {
690        if (__always_noconv_)
691        {
692            size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
693            if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
694                return traits_type::eof();
695        }
696        else
697        {
698            char* __extbe = __extbuf_;
699            codecvt_base::result __r;
700            do
701            {
702                if (!__cv_)
703                    __throw_bad_cast();
704
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    if (!__cv_)
795        __throw_bad_cast();
796
797    int __width = __cv_->encoding();
798    if (__file_ == 0 || (__width <= 0 && __off != 0) || sync())
799        return pos_type(off_type(-1));
800    // __width > 0 || __off == 0
801    int __whence;
802    switch (__way)
803    {
804    case ios_base::beg:
805        __whence = SEEK_SET;
806        break;
807    case ios_base::cur:
808        __whence = SEEK_CUR;
809        break;
810    case ios_base::end:
811        __whence = SEEK_END;
812        break;
813    default:
814        return pos_type(off_type(-1));
815    }
816#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
817    if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
818        return pos_type(off_type(-1));
819    pos_type __r = ftell(__file_);
820#else
821    if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
822        return pos_type(off_type(-1));
823    pos_type __r = ftello(__file_);
824#endif
825    __r.state(__st_);
826    return __r;
827}
828
829template <class _CharT, class _Traits>
830typename basic_filebuf<_CharT, _Traits>::pos_type
831basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
832{
833    if (__file_ == 0 || sync())
834        return pos_type(off_type(-1));
835#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
836    if (fseek(__file_, __sp, SEEK_SET))
837        return pos_type(off_type(-1));
838#else
839    if (fseeko(__file_, __sp, SEEK_SET))
840        return pos_type(off_type(-1));
841#endif
842    __st_ = __sp.state();
843    return __sp;
844}
845
846template <class _CharT, class _Traits>
847int
848basic_filebuf<_CharT, _Traits>::sync()
849{
850    if (__file_ == 0)
851        return 0;
852    if (!__cv_)
853        __throw_bad_cast();
854
855    if (__cm_ & ios_base::out)
856    {
857        if (this->pptr() != this->pbase())
858            if (overflow() == traits_type::eof())
859                return -1;
860        codecvt_base::result __r;
861        do
862        {
863            char* __extbe;
864            __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
865            size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
866            if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
867                return -1;
868        } while (__r == codecvt_base::partial);
869        if (__r == codecvt_base::error)
870            return -1;
871        if (fflush(__file_))
872            return -1;
873    }
874    else if (__cm_ & ios_base::in)
875    {
876        off_type __c;
877        state_type __state = __st_last_;
878        bool __update_st = false;
879        if (__always_noconv_)
880            __c = this->egptr() - this->gptr();
881        else
882        {
883            int __width = __cv_->encoding();
884            __c = __extbufend_ - __extbufnext_;
885            if (__width > 0)
886                __c += __width * (this->egptr() - this->gptr());
887            else
888            {
889                if (this->gptr() != this->egptr())
890                {
891                    const int __off =  __cv_->length(__state, __extbuf_,
892                                                     __extbufnext_,
893                                                     this->gptr() - this->eback());
894                    __c += __extbufnext_ - __extbuf_ - __off;
895                    __update_st = true;
896                }
897            }
898        }
899#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
900        if (fseek(__file_, -__c, SEEK_CUR))
901            return -1;
902#else
903        if (fseeko(__file_, -__c, SEEK_CUR))
904            return -1;
905#endif
906        if (__update_st)
907            __st_ = __state;
908        __extbufnext_ = __extbufend_ = __extbuf_;
909        this->setg(0, 0, 0);
910        __cm_ = 0;
911    }
912    return 0;
913}
914
915template <class _CharT, class _Traits>
916void
917basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
918{
919    sync();
920    __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
921    bool __old_anc = __always_noconv_;
922    __always_noconv_ = __cv_->always_noconv();
923    if (__old_anc != __always_noconv_)
924    {
925        this->setg(0, 0, 0);
926        this->setp(0, 0);
927        // invariant, char_type is char, else we couldn't get here
928        if (__always_noconv_)  // need to dump __intbuf_
929        {
930            if (__owns_eb_)
931                delete [] __extbuf_;
932            __owns_eb_ = __owns_ib_;
933            __ebs_ = __ibs_;
934            __extbuf_ = (char*)__intbuf_;
935            __ibs_ = 0;
936            __intbuf_ = 0;
937            __owns_ib_ = false;
938        }
939        else  // need to obtain an __intbuf_.
940        {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
941            if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
942            {
943                __ibs_ = __ebs_;
944                __intbuf_ = (char_type*)__extbuf_;
945                __owns_ib_ = false;
946                __extbuf_ = new char[__ebs_];
947                __owns_eb_ = true;
948            }
949            else
950            {
951                __ibs_ = __ebs_;
952                __intbuf_ = new char_type[__ibs_];
953                __owns_ib_ = true;
954            }
955        }
956    }
957}
958
959template <class _CharT, class _Traits>
960bool
961basic_filebuf<_CharT, _Traits>::__read_mode()
962{
963    if (!(__cm_ & ios_base::in))
964    {
965        this->setp(0, 0);
966        if (__always_noconv_)
967            this->setg((char_type*)__extbuf_,
968                       (char_type*)__extbuf_ + __ebs_,
969                       (char_type*)__extbuf_ + __ebs_);
970        else
971            this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
972        __cm_ = ios_base::in;
973        return true;
974    }
975    return false;
976}
977
978template <class _CharT, class _Traits>
979void
980basic_filebuf<_CharT, _Traits>::__write_mode()
981{
982    if (!(__cm_ & ios_base::out))
983    {
984        this->setg(0, 0, 0);
985        if (__ebs_ > sizeof(__extbuf_min_))
986        {
987            if (__always_noconv_)
988                this->setp((char_type*)__extbuf_,
989                           (char_type*)__extbuf_ + (__ebs_ - 1));
990            else
991                this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
992        }
993        else
994            this->setp(0, 0);
995        __cm_ = ios_base::out;
996    }
997}
998
999// basic_ifstream
1000
1001template <class _CharT, class _Traits>
1002class _LIBCPP_TEMPLATE_VIS basic_ifstream
1003    : public basic_istream<_CharT, _Traits>
1004{
1005public:
1006    typedef _CharT                         char_type;
1007    typedef _Traits                        traits_type;
1008    typedef typename traits_type::int_type int_type;
1009    typedef typename traits_type::pos_type pos_type;
1010    typedef typename traits_type::off_type off_type;
1011
1012    _LIBCPP_INLINE_VISIBILITY
1013    basic_ifstream();
1014#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1015    _LIBCPP_INLINE_VISIBILITY
1016    explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1017    _LIBCPP_INLINE_VISIBILITY
1018    explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1019#endif
1020#ifndef _LIBCPP_CXX03_LANG
1021    _LIBCPP_INLINE_VISIBILITY
1022    basic_ifstream(basic_ifstream&& __rhs);
1023
1024    _LIBCPP_INLINE_VISIBILITY
1025    basic_ifstream& operator=(basic_ifstream&& __rhs);
1026#endif
1027    _LIBCPP_INLINE_VISIBILITY
1028    void swap(basic_ifstream& __rhs);
1029
1030    _LIBCPP_INLINE_VISIBILITY
1031    basic_filebuf<char_type, traits_type>* rdbuf() const;
1032    _LIBCPP_INLINE_VISIBILITY
1033    bool is_open() const;
1034#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1035    void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1036    void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1037#endif
1038    _LIBCPP_INLINE_VISIBILITY
1039    void close();
1040
1041private:
1042    basic_filebuf<char_type, traits_type> __sb_;
1043};
1044
1045template <class _CharT, class _Traits>
1046inline
1047basic_ifstream<_CharT, _Traits>::basic_ifstream()
1048    : basic_istream<char_type, traits_type>(&__sb_)
1049{
1050}
1051
1052#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1053template <class _CharT, class _Traits>
1054inline
1055basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1056    : basic_istream<char_type, traits_type>(&__sb_)
1057{
1058    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1059        this->setstate(ios_base::failbit);
1060}
1061
1062template <class _CharT, class _Traits>
1063inline
1064basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1065    : basic_istream<char_type, traits_type>(&__sb_)
1066{
1067    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1068        this->setstate(ios_base::failbit);
1069}
1070#endif
1071
1072#ifndef _LIBCPP_CXX03_LANG
1073
1074template <class _CharT, class _Traits>
1075inline
1076basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1077    : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1078      __sb_(_VSTD::move(__rhs.__sb_))
1079{
1080    this->set_rdbuf(&__sb_);
1081}
1082
1083template <class _CharT, class _Traits>
1084inline
1085basic_ifstream<_CharT, _Traits>&
1086basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1087{
1088    basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1089    __sb_ = _VSTD::move(__rhs.__sb_);
1090    return *this;
1091}
1092
1093#endif  // _LIBCPP_CXX03_LANG
1094
1095template <class _CharT, class _Traits>
1096inline
1097void
1098basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1099{
1100    basic_istream<char_type, traits_type>::swap(__rhs);
1101    __sb_.swap(__rhs.__sb_);
1102}
1103
1104template <class _CharT, class _Traits>
1105inline _LIBCPP_INLINE_VISIBILITY
1106void
1107swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1108{
1109    __x.swap(__y);
1110}
1111
1112template <class _CharT, class _Traits>
1113inline
1114basic_filebuf<_CharT, _Traits>*
1115basic_ifstream<_CharT, _Traits>::rdbuf() const
1116{
1117    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1118}
1119
1120template <class _CharT, class _Traits>
1121inline
1122bool
1123basic_ifstream<_CharT, _Traits>::is_open() const
1124{
1125    return __sb_.is_open();
1126}
1127
1128#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1129template <class _CharT, class _Traits>
1130void
1131basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1132{
1133    if (__sb_.open(__s, __mode | ios_base::in))
1134        this->clear();
1135    else
1136        this->setstate(ios_base::failbit);
1137}
1138
1139template <class _CharT, class _Traits>
1140void
1141basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1142{
1143    if (__sb_.open(__s, __mode | ios_base::in))
1144        this->clear();
1145    else
1146        this->setstate(ios_base::failbit);
1147}
1148#endif
1149
1150template <class _CharT, class _Traits>
1151inline
1152void
1153basic_ifstream<_CharT, _Traits>::close()
1154{
1155    if (__sb_.close() == 0)
1156        this->setstate(ios_base::failbit);
1157}
1158
1159// basic_ofstream
1160
1161template <class _CharT, class _Traits>
1162class _LIBCPP_TEMPLATE_VIS basic_ofstream
1163    : public basic_ostream<_CharT, _Traits>
1164{
1165public:
1166    typedef _CharT                         char_type;
1167    typedef _Traits                        traits_type;
1168    typedef typename traits_type::int_type int_type;
1169    typedef typename traits_type::pos_type pos_type;
1170    typedef typename traits_type::off_type off_type;
1171
1172    _LIBCPP_INLINE_VISIBILITY
1173    basic_ofstream();
1174    _LIBCPP_INLINE_VISIBILITY
1175    explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1176    _LIBCPP_INLINE_VISIBILITY
1177    explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1178#ifndef _LIBCPP_CXX03_LANG
1179    _LIBCPP_INLINE_VISIBILITY
1180    basic_ofstream(basic_ofstream&& __rhs);
1181
1182    _LIBCPP_INLINE_VISIBILITY
1183    basic_ofstream& operator=(basic_ofstream&& __rhs);
1184#endif
1185    _LIBCPP_INLINE_VISIBILITY
1186    void swap(basic_ofstream& __rhs);
1187
1188    _LIBCPP_INLINE_VISIBILITY
1189    basic_filebuf<char_type, traits_type>* rdbuf() const;
1190    _LIBCPP_INLINE_VISIBILITY
1191    bool is_open() const;
1192#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1193    void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1194    void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1195#endif
1196    _LIBCPP_INLINE_VISIBILITY
1197    void close();
1198
1199private:
1200    basic_filebuf<char_type, traits_type> __sb_;
1201};
1202
1203template <class _CharT, class _Traits>
1204inline
1205basic_ofstream<_CharT, _Traits>::basic_ofstream()
1206    : basic_ostream<char_type, traits_type>(&__sb_)
1207{
1208}
1209
1210#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1211template <class _CharT, class _Traits>
1212inline
1213basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1214    : basic_ostream<char_type, traits_type>(&__sb_)
1215{
1216    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1217        this->setstate(ios_base::failbit);
1218}
1219
1220template <class _CharT, class _Traits>
1221inline
1222basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1223    : basic_ostream<char_type, traits_type>(&__sb_)
1224{
1225    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1226        this->setstate(ios_base::failbit);
1227}
1228#endif
1229
1230#ifndef _LIBCPP_CXX03_LANG
1231
1232template <class _CharT, class _Traits>
1233inline
1234basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1235    : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1236      __sb_(_VSTD::move(__rhs.__sb_))
1237{
1238    this->set_rdbuf(&__sb_);
1239}
1240
1241template <class _CharT, class _Traits>
1242inline
1243basic_ofstream<_CharT, _Traits>&
1244basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1245{
1246    basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1247    __sb_ = _VSTD::move(__rhs.__sb_);
1248    return *this;
1249}
1250
1251#endif  // _LIBCPP_CXX03_LANG
1252
1253template <class _CharT, class _Traits>
1254inline
1255void
1256basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1257{
1258    basic_ostream<char_type, traits_type>::swap(__rhs);
1259    __sb_.swap(__rhs.__sb_);
1260}
1261
1262template <class _CharT, class _Traits>
1263inline _LIBCPP_INLINE_VISIBILITY
1264void
1265swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1266{
1267    __x.swap(__y);
1268}
1269
1270template <class _CharT, class _Traits>
1271inline
1272basic_filebuf<_CharT, _Traits>*
1273basic_ofstream<_CharT, _Traits>::rdbuf() const
1274{
1275    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1276}
1277
1278template <class _CharT, class _Traits>
1279inline
1280bool
1281basic_ofstream<_CharT, _Traits>::is_open() const
1282{
1283    return __sb_.is_open();
1284}
1285
1286#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1287template <class _CharT, class _Traits>
1288void
1289basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1290{
1291    if (__sb_.open(__s, __mode | ios_base::out))
1292        this->clear();
1293    else
1294        this->setstate(ios_base::failbit);
1295}
1296
1297template <class _CharT, class _Traits>
1298void
1299basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1300{
1301    if (__sb_.open(__s, __mode | ios_base::out))
1302        this->clear();
1303    else
1304        this->setstate(ios_base::failbit);
1305}
1306#endif
1307
1308template <class _CharT, class _Traits>
1309inline
1310void
1311basic_ofstream<_CharT, _Traits>::close()
1312{
1313    if (__sb_.close() == 0)
1314        this->setstate(ios_base::failbit);
1315}
1316
1317// basic_fstream
1318
1319template <class _CharT, class _Traits>
1320class _LIBCPP_TEMPLATE_VIS basic_fstream
1321    : public basic_iostream<_CharT, _Traits>
1322{
1323public:
1324    typedef _CharT                         char_type;
1325    typedef _Traits                        traits_type;
1326    typedef typename traits_type::int_type int_type;
1327    typedef typename traits_type::pos_type pos_type;
1328    typedef typename traits_type::off_type off_type;
1329
1330    _LIBCPP_INLINE_VISIBILITY
1331    basic_fstream();
1332#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1333    _LIBCPP_INLINE_VISIBILITY
1334    explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1335    _LIBCPP_INLINE_VISIBILITY
1336    explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1337#endif
1338#ifndef _LIBCPP_CXX03_LANG
1339    _LIBCPP_INLINE_VISIBILITY
1340    basic_fstream(basic_fstream&& __rhs);
1341
1342    _LIBCPP_INLINE_VISIBILITY
1343    basic_fstream& operator=(basic_fstream&& __rhs);
1344#endif
1345    _LIBCPP_INLINE_VISIBILITY
1346    void swap(basic_fstream& __rhs);
1347
1348    _LIBCPP_INLINE_VISIBILITY
1349    basic_filebuf<char_type, traits_type>* rdbuf() const;
1350    _LIBCPP_INLINE_VISIBILITY
1351    bool is_open() const;
1352#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1353    void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1354    void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1355#endif
1356    _LIBCPP_INLINE_VISIBILITY
1357    void close();
1358
1359private:
1360    basic_filebuf<char_type, traits_type> __sb_;
1361};
1362
1363template <class _CharT, class _Traits>
1364inline
1365basic_fstream<_CharT, _Traits>::basic_fstream()
1366    : basic_iostream<char_type, traits_type>(&__sb_)
1367{
1368}
1369
1370#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1371template <class _CharT, class _Traits>
1372inline
1373basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1374    : basic_iostream<char_type, traits_type>(&__sb_)
1375{
1376    if (__sb_.open(__s, __mode) == 0)
1377        this->setstate(ios_base::failbit);
1378}
1379
1380template <class _CharT, class _Traits>
1381inline
1382basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1383    : basic_iostream<char_type, traits_type>(&__sb_)
1384{
1385    if (__sb_.open(__s, __mode) == 0)
1386        this->setstate(ios_base::failbit);
1387}
1388#endif
1389
1390#ifndef _LIBCPP_CXX03_LANG
1391
1392template <class _CharT, class _Traits>
1393inline
1394basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1395    : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1396      __sb_(_VSTD::move(__rhs.__sb_))
1397{
1398    this->set_rdbuf(&__sb_);
1399}
1400
1401template <class _CharT, class _Traits>
1402inline
1403basic_fstream<_CharT, _Traits>&
1404basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1405{
1406    basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1407    __sb_ = _VSTD::move(__rhs.__sb_);
1408    return *this;
1409}
1410
1411#endif  // _LIBCPP_CXX03_LANG
1412
1413template <class _CharT, class _Traits>
1414inline
1415void
1416basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1417{
1418    basic_iostream<char_type, traits_type>::swap(__rhs);
1419    __sb_.swap(__rhs.__sb_);
1420}
1421
1422template <class _CharT, class _Traits>
1423inline _LIBCPP_INLINE_VISIBILITY
1424void
1425swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1426{
1427    __x.swap(__y);
1428}
1429
1430template <class _CharT, class _Traits>
1431inline
1432basic_filebuf<_CharT, _Traits>*
1433basic_fstream<_CharT, _Traits>::rdbuf() const
1434{
1435    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1436}
1437
1438template <class _CharT, class _Traits>
1439inline
1440bool
1441basic_fstream<_CharT, _Traits>::is_open() const
1442{
1443    return __sb_.is_open();
1444}
1445
1446#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1447template <class _CharT, class _Traits>
1448void
1449basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1450{
1451    if (__sb_.open(__s, __mode))
1452        this->clear();
1453    else
1454        this->setstate(ios_base::failbit);
1455}
1456
1457template <class _CharT, class _Traits>
1458void
1459basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1460{
1461    if (__sb_.open(__s, __mode))
1462        this->clear();
1463    else
1464        this->setstate(ios_base::failbit);
1465}
1466#endif
1467
1468template <class _CharT, class _Traits>
1469inline
1470void
1471basic_fstream<_CharT, _Traits>::close()
1472{
1473    if (__sb_.close() == 0)
1474        this->setstate(ios_base::failbit);
1475}
1476
1477_LIBCPP_END_NAMESPACE_STD
1478
1479#endif  // _LIBCPP_FSTREAM
1480