1// -*- C++ -*-
2//===------------------------- streambuf ----------------------------------===//
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_STEAMBUF
12#define _LIBCPP_STEAMBUF
13
14/*
15    streambuf synopsis
16
17namespace std
18{
19
20template <class charT, class traits = char_traits<charT> >
21class basic_streambuf
22{
23public:
24    // types:
25    typedef charT char_type;
26    typedef traits traits_type;
27    typedef typename traits_type::int_type int_type;
28    typedef typename traits_type::pos_type pos_type;
29    typedef typename traits_type::off_type off_type;
30
31    virtual ~basic_streambuf();
32
33    // 27.6.2.2.1 locales:
34    locale pubimbue(const locale& loc);
35    locale getloc() const;
36
37    // 27.6.2.2.2 buffer and positioning:
38    basic_streambuf* pubsetbuf(char_type* s, streamsize n);
39    pos_type pubseekoff(off_type off, ios_base::seekdir way,
40                        ios_base::openmode which = ios_base::in | ios_base::out);
41    pos_type pubseekpos(pos_type sp,
42                        ios_base::openmode which = ios_base::in | ios_base::out);
43    int pubsync();
44
45    // Get and put areas:
46    // 27.6.2.2.3 Get area:
47    streamsize in_avail();
48    int_type snextc();
49    int_type sbumpc();
50    int_type sgetc();
51    streamsize sgetn(char_type* s, streamsize n);
52
53    // 27.6.2.2.4 Putback:
54    int_type sputbackc(char_type c);
55    int_type sungetc();
56
57    // 27.6.2.2.5 Put area:
58    int_type sputc(char_type c);
59    streamsize sputn(const char_type* s, streamsize n);
60
61protected:
62    basic_streambuf();
63    basic_streambuf(const basic_streambuf& rhs);
64    basic_streambuf& operator=(const basic_streambuf& rhs);
65    void swap(basic_streambuf& rhs);
66
67    // 27.6.2.3.2 Get area:
68    char_type* eback() const;
69    char_type* gptr() const;
70    char_type* egptr() const;
71    void gbump(int n);
72    void setg(char_type* gbeg, char_type* gnext, char_type* gend);
73
74    // 27.6.2.3.3 Put area:
75    char_type* pbase() const;
76    char_type* pptr() const;
77    char_type* epptr() const;
78    void pbump(int n);
79    void setp(char_type* pbeg, char_type* pend);
80
81    // 27.6.2.4 virtual functions:
82    // 27.6.2.4.1 Locales:
83    virtual void imbue(const locale& loc);
84
85    // 27.6.2.4.2 Buffer management and positioning:
86    virtual basic_streambuf* setbuf(char_type* s, streamsize n);
87    virtual pos_type seekoff(off_type off, ios_base::seekdir way,
88                             ios_base::openmode which = ios_base::in | ios_base::out);
89    virtual pos_type seekpos(pos_type sp,
90                             ios_base::openmode which = ios_base::in | ios_base::out);
91    virtual int sync();
92
93    // 27.6.2.4.3 Get area:
94    virtual streamsize showmanyc();
95    virtual streamsize xsgetn(char_type* s, streamsize n);
96    virtual int_type underflow();
97    virtual int_type uflow();
98
99    // 27.6.2.4.4 Putback:
100    virtual int_type pbackfail(int_type c = traits_type::eof());
101
102    // 27.6.2.4.5 Put area:
103    virtual streamsize xsputn(const char_type* s, streamsize n);
104    virtual int_type overflow (int_type c = traits_type::eof());
105};
106
107}  // std
108
109*/
110
111#include <__config>
112#include <iosfwd>
113#include <ios>
114
115#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
116#pragma GCC system_header
117#endif
118
119_LIBCPP_PUSH_MACROS
120#include <__undef_macros>
121
122_LIBCPP_BEGIN_NAMESPACE_STD
123
124template <class _CharT, class _Traits>
125class _LIBCPP_TEMPLATE_VIS basic_streambuf
126{
127public:
128    // types:
129    typedef _CharT                         char_type;
130    typedef _Traits                        traits_type;
131    typedef typename traits_type::int_type int_type;
132    typedef typename traits_type::pos_type pos_type;
133    typedef typename traits_type::off_type off_type;
134
135    virtual ~basic_streambuf();
136
137    // 27.6.2.2.1 locales:
138    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
139    locale pubimbue(const locale& __loc) {
140        imbue(__loc);
141        locale __r = __loc_;
142        __loc_ = __loc;
143        return __r;
144    }
145
146    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
147    locale getloc() const { return __loc_; }
148
149    // 27.6.2.2.2 buffer and positioning:
150    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
151    basic_streambuf* pubsetbuf(char_type* __s, streamsize __n)
152    { return setbuf(__s, __n); }
153
154    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
155    pos_type pubseekoff(off_type __off, ios_base::seekdir __way,
156                        ios_base::openmode __which = ios_base::in | ios_base::out)
157    { return seekoff(__off, __way, __which); }
158
159    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
160    pos_type pubseekpos(pos_type __sp,
161                        ios_base::openmode __which = ios_base::in | ios_base::out)
162    { return seekpos(__sp, __which); }
163
164    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
165    int pubsync() { return sync(); }
166
167    // Get and put areas:
168    // 27.6.2.2.3 Get area:
169    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
170    streamsize in_avail() {
171        if (__ninp_ < __einp_)
172            return static_cast<streamsize>(__einp_ - __ninp_);
173        return showmanyc();
174    }
175
176    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
177    int_type snextc() {
178        if (sbumpc() == traits_type::eof())
179            return traits_type::eof();
180        return sgetc();
181    }
182
183    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
184    int_type sbumpc() {
185        if (__ninp_ == __einp_)
186            return uflow();
187        return traits_type::to_int_type(*__ninp_++);
188    }
189
190    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
191    int_type sgetc() {
192        if (__ninp_ == __einp_)
193            return underflow();
194        return traits_type::to_int_type(*__ninp_);
195    }
196
197    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
198    streamsize sgetn(char_type* __s, streamsize __n)
199    { return xsgetn(__s, __n); }
200
201    // 27.6.2.2.4 Putback:
202    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
203    int_type sputbackc(char_type __c) {
204        if (__binp_ == __ninp_ || !traits_type::eq(__c, __ninp_[-1]))
205            return pbackfail(traits_type::to_int_type(__c));
206        return traits_type::to_int_type(*--__ninp_);
207    }
208
209    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
210    int_type sungetc() {
211        if (__binp_ == __ninp_)
212          return pbackfail();
213        return traits_type::to_int_type(*--__ninp_);
214    }
215
216    // 27.6.2.2.5 Put area:
217    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
218    int_type sputc(char_type __c) {
219        if (__nout_ == __eout_)
220            return overflow(traits_type::to_int_type(__c));
221        *__nout_++ = __c;
222        return traits_type::to_int_type(__c);
223    }
224
225    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
226    streamsize sputn(const char_type* __s, streamsize __n)
227    { return xsputn(__s, __n); }
228
229protected:
230    basic_streambuf();
231    basic_streambuf(const basic_streambuf& __rhs);
232    basic_streambuf& operator=(const basic_streambuf& __rhs);
233    void swap(basic_streambuf& __rhs);
234
235    // 27.6.2.3.2 Get area:
236    _LIBCPP_ALWAYS_INLINE char_type* eback() const {return __binp_;}
237    _LIBCPP_ALWAYS_INLINE char_type* gptr()  const {return __ninp_;}
238    _LIBCPP_ALWAYS_INLINE char_type* egptr() const {return __einp_;}
239
240    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
241    void gbump(int __n) { __ninp_ += __n; }
242
243    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
244    void setg(char_type* __gbeg, char_type* __gnext, char_type* __gend) {
245        __binp_ = __gbeg;
246        __ninp_ = __gnext;
247        __einp_ = __gend;
248    }
249
250    // 27.6.2.3.3 Put area:
251    _LIBCPP_ALWAYS_INLINE char_type* pbase() const {return __bout_;}
252    _LIBCPP_ALWAYS_INLINE char_type* pptr()  const {return __nout_;}
253    _LIBCPP_ALWAYS_INLINE char_type* epptr() const {return __eout_;}
254
255    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
256    void pbump(int __n) { __nout_ += __n; }
257
258    inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
259    void setp(char_type* __pbeg, char_type* __pend) {
260        __bout_ = __nout_ = __pbeg;
261        __eout_ = __pend;
262    }
263
264    // 27.6.2.4 virtual functions:
265    // 27.6.2.4.1 Locales:
266    virtual void imbue(const locale& __loc);
267
268    // 27.6.2.4.2 Buffer management and positioning:
269    virtual basic_streambuf* setbuf(char_type* __s, streamsize __n);
270    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
271                             ios_base::openmode __which = ios_base::in | ios_base::out);
272    virtual pos_type seekpos(pos_type __sp,
273                             ios_base::openmode __which = ios_base::in | ios_base::out);
274    virtual int sync();
275
276    // 27.6.2.4.3 Get area:
277    virtual streamsize showmanyc();
278    virtual streamsize xsgetn(char_type* __s, streamsize __n);
279    virtual int_type underflow();
280    virtual int_type uflow();
281
282    // 27.6.2.4.4 Putback:
283    virtual int_type pbackfail(int_type __c = traits_type::eof());
284
285    // 27.6.2.4.5 Put area:
286    virtual streamsize xsputn(const char_type* __s, streamsize __n);
287    virtual int_type overflow(int_type __c = traits_type::eof());
288
289private:
290    locale __loc_;
291    char_type* __binp_;
292    char_type* __ninp_;
293    char_type* __einp_;
294    char_type* __bout_;
295    char_type* __nout_;
296    char_type* __eout_;
297};
298
299template <class _CharT, class _Traits>
300basic_streambuf<_CharT, _Traits>::~basic_streambuf()
301{
302}
303
304template <class _CharT, class _Traits>
305basic_streambuf<_CharT, _Traits>::basic_streambuf()
306    : __binp_(0),
307      __ninp_(0),
308      __einp_(0),
309      __bout_(0),
310      __nout_(0),
311      __eout_(0)
312{
313}
314
315template <class _CharT, class _Traits>
316basic_streambuf<_CharT, _Traits>::basic_streambuf(const basic_streambuf& __sb)
317    : __loc_(__sb.__loc_),
318      __binp_(__sb.__binp_),
319      __ninp_(__sb.__ninp_),
320      __einp_(__sb.__einp_),
321      __bout_(__sb.__bout_),
322      __nout_(__sb.__nout_),
323      __eout_(__sb.__eout_)
324{
325}
326
327template <class _CharT, class _Traits>
328basic_streambuf<_CharT, _Traits>&
329basic_streambuf<_CharT, _Traits>::operator=(const basic_streambuf& __sb)
330{
331    __loc_ = __sb.__loc_;
332    __binp_ = __sb.__binp_;
333    __ninp_ = __sb.__ninp_;
334    __einp_ = __sb.__einp_;
335    __bout_ = __sb.__bout_;
336    __nout_ = __sb.__nout_;
337    __eout_ = __sb.__eout_;
338    return *this;
339}
340
341template <class _CharT, class _Traits>
342void
343basic_streambuf<_CharT, _Traits>::swap(basic_streambuf& __sb)
344{
345    _VSTD::swap(__loc_, __sb.__loc_);
346    _VSTD::swap(__binp_, __sb.__binp_);
347    _VSTD::swap(__ninp_, __sb.__ninp_);
348    _VSTD::swap(__einp_, __sb.__einp_);
349    _VSTD::swap(__bout_, __sb.__bout_);
350    _VSTD::swap(__nout_, __sb.__nout_);
351    _VSTD::swap(__eout_, __sb.__eout_);
352}
353
354template <class _CharT, class _Traits>
355void
356basic_streambuf<_CharT, _Traits>::imbue(const locale&)
357{
358}
359
360template <class _CharT, class _Traits>
361basic_streambuf<_CharT, _Traits>*
362basic_streambuf<_CharT, _Traits>::setbuf(char_type*, streamsize)
363{
364    return this;
365}
366
367template <class _CharT, class _Traits>
368typename basic_streambuf<_CharT, _Traits>::pos_type
369basic_streambuf<_CharT, _Traits>::seekoff(off_type, ios_base::seekdir,
370                                          ios_base::openmode)
371{
372    return pos_type(off_type(-1));
373}
374
375template <class _CharT, class _Traits>
376typename basic_streambuf<_CharT, _Traits>::pos_type
377basic_streambuf<_CharT, _Traits>::seekpos(pos_type, ios_base::openmode)
378{
379    return pos_type(off_type(-1));
380}
381
382template <class _CharT, class _Traits>
383int
384basic_streambuf<_CharT, _Traits>::sync()
385{
386    return 0;
387}
388
389template <class _CharT, class _Traits>
390streamsize
391basic_streambuf<_CharT, _Traits>::showmanyc()
392{
393    return 0;
394}
395
396template <class _CharT, class _Traits>
397streamsize
398basic_streambuf<_CharT, _Traits>::xsgetn(char_type* __s, streamsize __n)
399{
400    const int_type __eof = traits_type::eof();
401    int_type __c;
402    streamsize __i = 0;
403    while(__i < __n)
404    {
405        if (__ninp_ < __einp_)
406        {
407            const streamsize __len = _VSTD::min(__einp_ - __ninp_, __n - __i);
408            traits_type::copy(__s, __ninp_, __len);
409            __s +=  __len;
410            __i +=  __len;
411            this->gbump(__len);
412        }
413        else if ((__c = uflow()) != __eof)
414        {
415            *__s = traits_type::to_char_type(__c);
416            ++__s;
417            ++__i;
418        }
419        else
420            break;
421    }
422    return __i;
423}
424
425template <class _CharT, class _Traits>
426typename basic_streambuf<_CharT, _Traits>::int_type
427basic_streambuf<_CharT, _Traits>::underflow()
428{
429    return traits_type::eof();
430}
431
432template <class _CharT, class _Traits>
433typename basic_streambuf<_CharT, _Traits>::int_type
434basic_streambuf<_CharT, _Traits>::uflow()
435{
436    if (underflow() == traits_type::eof())
437        return traits_type::eof();
438    return traits_type::to_int_type(*__ninp_++);
439}
440
441template <class _CharT, class _Traits>
442typename basic_streambuf<_CharT, _Traits>::int_type
443basic_streambuf<_CharT, _Traits>::pbackfail(int_type)
444{
445    return traits_type::eof();
446}
447
448template <class _CharT, class _Traits>
449streamsize
450basic_streambuf<_CharT, _Traits>::xsputn(const char_type* __s, streamsize __n)
451{
452    streamsize __i = 0;
453    int_type __eof = traits_type::eof();
454    while( __i < __n)
455    {
456        if (__nout_ >= __eout_)
457        {
458            if (overflow(traits_type::to_int_type(*__s)) == __eof)
459                break;
460            ++__s;
461            ++__i;
462        }
463        else
464        {
465            streamsize __chunk_size = _VSTD::min(__eout_ - __nout_, __n - __i);
466            traits_type::copy(__nout_, __s, __chunk_size);
467            __nout_ += __chunk_size;
468            __s     += __chunk_size;
469            __i     += __chunk_size;
470        }
471    }
472    return __i;
473}
474
475template <class _CharT, class _Traits>
476typename basic_streambuf<_CharT, _Traits>::int_type
477basic_streambuf<_CharT, _Traits>::overflow(int_type)
478{
479    return traits_type::eof();
480}
481
482#ifndef _LIBCPP_AVAILABILITY_NO_STREAMS_EXTERN_TEMPLATE
483_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<char>)
484_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<wchar_t>)
485
486_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<char>)
487_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<wchar_t>)
488#endif
489
490_LIBCPP_END_NAMESPACE_STD
491
492_LIBCPP_POP_MACROS
493
494#endif  // _LIBCPP_STEAMBUF
495