2 //===------------------------- streambuf ----------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_STEAMBUF
12 #define _LIBCPP_STEAMBUF
20 template <class charT, class traits = char_traits<charT> >
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;
31 virtual ~basic_streambuf();
33 // 27.6.2.2.1 locales:
34 locale pubimbue(const locale& loc);
35 locale getloc() const;
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);
46 // 27.6.2.2.3 Get area:
47 streamsize in_avail();
51 streamsize sgetn(char_type* s, streamsize n);
53 // 27.6.2.2.4 Putback:
54 int_type sputbackc(char_type c);
57 // 27.6.2.2.5 Put area:
58 int_type sputc(char_type c);
59 streamsize sputn(const char_type* s, streamsize n);
63 basic_streambuf(const basic_streambuf& rhs);
64 basic_streambuf& operator=(const basic_streambuf& rhs);
65 void swap(basic_streambuf& rhs);
67 // 27.6.2.3.2 Get area:
68 char_type* eback() const;
69 char_type* gptr() const;
70 char_type* egptr() const;
72 void setg(char_type* gbeg, char_type* gnext, char_type* gend);
74 // 27.6.2.3.3 Put area:
75 char_type* pbase() const;
76 char_type* pptr() const;
77 char_type* epptr() const;
79 void setp(char_type* pbeg, char_type* pend);
81 // 27.6.2.4 virtual functions:
82 // 27.6.2.4.1 Locales:
83 virtual void imbue(const locale& loc);
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);
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();
99 // 27.6.2.4.4 Putback:
100 virtual int_type pbackfail(int_type c = traits_type::eof());
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());
115 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
116 #pragma GCC system_header
120 #include <__undef_macros>
122 _LIBCPP_BEGIN_NAMESPACE_STD
124 template <class _CharT, class _Traits>
125 class _LIBCPP_TEMPLATE_VIS basic_streambuf
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;
135 static_assert((is_same<_CharT, typename traits_type::char_type>::value),
136 "traits_type::char_type must be the same type as CharT");
138 virtual ~basic_streambuf();
140 // 27.6.2.2.1 locales:
141 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
142 locale pubimbue(const locale& __loc) {
149 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
150 locale getloc() const { return __loc_; }
152 // 27.6.2.2.2 buffer and positioning:
153 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
154 basic_streambuf* pubsetbuf(char_type* __s, streamsize __n)
155 { return setbuf(__s, __n); }
157 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
158 pos_type pubseekoff(off_type __off, ios_base::seekdir __way,
159 ios_base::openmode __which = ios_base::in | ios_base::out)
160 { return seekoff(__off, __way, __which); }
162 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
163 pos_type pubseekpos(pos_type __sp,
164 ios_base::openmode __which = ios_base::in | ios_base::out)
165 { return seekpos(__sp, __which); }
167 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
168 int pubsync() { return sync(); }
170 // Get and put areas:
171 // 27.6.2.2.3 Get area:
172 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
173 streamsize in_avail() {
174 if (__ninp_ < __einp_)
175 return static_cast<streamsize>(__einp_ - __ninp_);
179 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
181 if (sbumpc() == traits_type::eof())
182 return traits_type::eof();
186 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
188 if (__ninp_ == __einp_)
190 return traits_type::to_int_type(*__ninp_++);
193 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
195 if (__ninp_ == __einp_)
197 return traits_type::to_int_type(*__ninp_);
200 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
201 streamsize sgetn(char_type* __s, streamsize __n)
202 { return xsgetn(__s, __n); }
204 // 27.6.2.2.4 Putback:
205 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
206 int_type sputbackc(char_type __c) {
207 if (__binp_ == __ninp_ || !traits_type::eq(__c, __ninp_[-1]))
208 return pbackfail(traits_type::to_int_type(__c));
209 return traits_type::to_int_type(*--__ninp_);
212 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
214 if (__binp_ == __ninp_)
216 return traits_type::to_int_type(*--__ninp_);
219 // 27.6.2.2.5 Put area:
220 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
221 int_type sputc(char_type __c) {
222 if (__nout_ == __eout_)
223 return overflow(traits_type::to_int_type(__c));
225 return traits_type::to_int_type(__c);
228 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
229 streamsize sputn(const char_type* __s, streamsize __n)
230 { return xsputn(__s, __n); }
234 basic_streambuf(const basic_streambuf& __rhs);
235 basic_streambuf& operator=(const basic_streambuf& __rhs);
236 void swap(basic_streambuf& __rhs);
238 // 27.6.2.3.2 Get area:
239 _LIBCPP_INLINE_VISIBILITY char_type* eback() const {return __binp_;}
240 _LIBCPP_INLINE_VISIBILITY char_type* gptr() const {return __ninp_;}
241 _LIBCPP_INLINE_VISIBILITY char_type* egptr() const {return __einp_;}
243 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
244 void gbump(int __n) { __ninp_ += __n; }
246 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
247 void setg(char_type* __gbeg, char_type* __gnext, char_type* __gend) {
253 // 27.6.2.3.3 Put area:
254 _LIBCPP_INLINE_VISIBILITY char_type* pbase() const {return __bout_;}
255 _LIBCPP_INLINE_VISIBILITY char_type* pptr() const {return __nout_;}
256 _LIBCPP_INLINE_VISIBILITY char_type* epptr() const {return __eout_;}
258 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
259 void pbump(int __n) { __nout_ += __n; }
261 _LIBCPP_INLINE_VISIBILITY
262 void __pbump(streamsize __n) { __nout_ += __n; }
264 inline _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
265 void setp(char_type* __pbeg, char_type* __pend) {
266 __bout_ = __nout_ = __pbeg;
270 // 27.6.2.4 virtual functions:
271 // 27.6.2.4.1 Locales:
272 virtual void imbue(const locale& __loc);
274 // 27.6.2.4.2 Buffer management and positioning:
275 virtual basic_streambuf* setbuf(char_type* __s, streamsize __n);
276 virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
277 ios_base::openmode __which = ios_base::in | ios_base::out);
278 virtual pos_type seekpos(pos_type __sp,
279 ios_base::openmode __which = ios_base::in | ios_base::out);
282 // 27.6.2.4.3 Get area:
283 virtual streamsize showmanyc();
284 virtual streamsize xsgetn(char_type* __s, streamsize __n);
285 virtual int_type underflow();
286 virtual int_type uflow();
288 // 27.6.2.4.4 Putback:
289 virtual int_type pbackfail(int_type __c = traits_type::eof());
291 // 27.6.2.4.5 Put area:
292 virtual streamsize xsputn(const char_type* __s, streamsize __n);
293 virtual int_type overflow(int_type __c = traits_type::eof());
305 template <class _CharT, class _Traits>
306 basic_streambuf<_CharT, _Traits>::~basic_streambuf()
310 template <class _CharT, class _Traits>
311 basic_streambuf<_CharT, _Traits>::basic_streambuf()
321 template <class _CharT, class _Traits>
322 basic_streambuf<_CharT, _Traits>::basic_streambuf(const basic_streambuf& __sb)
323 : __loc_(__sb.__loc_),
324 __binp_(__sb.__binp_),
325 __ninp_(__sb.__ninp_),
326 __einp_(__sb.__einp_),
327 __bout_(__sb.__bout_),
328 __nout_(__sb.__nout_),
329 __eout_(__sb.__eout_)
333 template <class _CharT, class _Traits>
334 basic_streambuf<_CharT, _Traits>&
335 basic_streambuf<_CharT, _Traits>::operator=(const basic_streambuf& __sb)
337 __loc_ = __sb.__loc_;
338 __binp_ = __sb.__binp_;
339 __ninp_ = __sb.__ninp_;
340 __einp_ = __sb.__einp_;
341 __bout_ = __sb.__bout_;
342 __nout_ = __sb.__nout_;
343 __eout_ = __sb.__eout_;
347 template <class _CharT, class _Traits>
349 basic_streambuf<_CharT, _Traits>::swap(basic_streambuf& __sb)
351 _VSTD::swap(__loc_, __sb.__loc_);
352 _VSTD::swap(__binp_, __sb.__binp_);
353 _VSTD::swap(__ninp_, __sb.__ninp_);
354 _VSTD::swap(__einp_, __sb.__einp_);
355 _VSTD::swap(__bout_, __sb.__bout_);
356 _VSTD::swap(__nout_, __sb.__nout_);
357 _VSTD::swap(__eout_, __sb.__eout_);
360 template <class _CharT, class _Traits>
362 basic_streambuf<_CharT, _Traits>::imbue(const locale&)
366 template <class _CharT, class _Traits>
367 basic_streambuf<_CharT, _Traits>*
368 basic_streambuf<_CharT, _Traits>::setbuf(char_type*, streamsize)
373 template <class _CharT, class _Traits>
374 typename basic_streambuf<_CharT, _Traits>::pos_type
375 basic_streambuf<_CharT, _Traits>::seekoff(off_type, ios_base::seekdir,
378 return pos_type(off_type(-1));
381 template <class _CharT, class _Traits>
382 typename basic_streambuf<_CharT, _Traits>::pos_type
383 basic_streambuf<_CharT, _Traits>::seekpos(pos_type, ios_base::openmode)
385 return pos_type(off_type(-1));
388 template <class _CharT, class _Traits>
390 basic_streambuf<_CharT, _Traits>::sync()
395 template <class _CharT, class _Traits>
397 basic_streambuf<_CharT, _Traits>::showmanyc()
402 template <class _CharT, class _Traits>
404 basic_streambuf<_CharT, _Traits>::xsgetn(char_type* __s, streamsize __n)
406 const int_type __eof = traits_type::eof();
411 if (__ninp_ < __einp_)
413 const streamsize __len = _VSTD::min(static_cast<streamsize>(INT_MAX),
414 _VSTD::min(__einp_ - __ninp_, __n - __i));
415 traits_type::copy(__s, __ninp_, __len);
420 else if ((__c = uflow()) != __eof)
422 *__s = traits_type::to_char_type(__c);
432 template <class _CharT, class _Traits>
433 typename basic_streambuf<_CharT, _Traits>::int_type
434 basic_streambuf<_CharT, _Traits>::underflow()
436 return traits_type::eof();
439 template <class _CharT, class _Traits>
440 typename basic_streambuf<_CharT, _Traits>::int_type
441 basic_streambuf<_CharT, _Traits>::uflow()
443 if (underflow() == traits_type::eof())
444 return traits_type::eof();
445 return traits_type::to_int_type(*__ninp_++);
448 template <class _CharT, class _Traits>
449 typename basic_streambuf<_CharT, _Traits>::int_type
450 basic_streambuf<_CharT, _Traits>::pbackfail(int_type)
452 return traits_type::eof();
455 template <class _CharT, class _Traits>
457 basic_streambuf<_CharT, _Traits>::xsputn(const char_type* __s, streamsize __n)
460 int_type __eof = traits_type::eof();
463 if (__nout_ >= __eout_)
465 if (overflow(traits_type::to_int_type(*__s)) == __eof)
472 streamsize __chunk_size = _VSTD::min(__eout_ - __nout_, __n - __i);
473 traits_type::copy(__nout_, __s, __chunk_size);
474 __nout_ += __chunk_size;
482 template <class _CharT, class _Traits>
483 typename basic_streambuf<_CharT, _Traits>::int_type
484 basic_streambuf<_CharT, _Traits>::overflow(int_type)
486 return traits_type::eof();
489 #ifndef _LIBCPP_AVAILABILITY_NO_STREAMS_EXTERN_TEMPLATE
490 _LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<char>)
491 _LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<wchar_t>)
493 _LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<char>)
494 _LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<wchar_t>)
497 _LIBCPP_END_NAMESPACE_STD
501 #endif // _LIBCPP_STEAMBUF