1// -*- C++ -*-
2//===------------------------- streambuf ----------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_STEAMBUF
11#define _LIBCPP_STEAMBUF
12
13/*
14 streambuf synopsis
15
16namespace std
17{
18
19template <class charT, class traits = char_traits<charT> >
20class basic_streambuf
21{
22public:
23 // types:
24 typedef charT char_type;
25 typedef traits traits_type;
26 typedef typename traits_type::int_type int_type;
27 typedef typename traits_type::pos_type pos_type;
28 typedef typename traits_type::off_type off_type;
29
30 virtual ~basic_streambuf();
31
32 // 27.6.2.2.1 locales:
33 locale pubimbue(const locale& loc);
34 locale getloc() const;
35
36 // 27.6.2.2.2 buffer and positioning:
37 basic_streambuf* pubsetbuf(char_type* s, streamsize n);
38 pos_type pubseekoff(off_type off, ios_base::seekdir way,
39 ios_base::openmode which = ios_base::in | ios_base::out);
40 pos_type pubseekpos(pos_type sp,
41 ios_base::openmode which = ios_base::in | ios_base::out);
42 int pubsync();
43
44 // Get and put areas:
45 // 27.6.2.2.3 Get area:
46 streamsize in_avail();
47 int_type snextc();
48 int_type sbumpc();
49 int_type sgetc();
50 streamsize sgetn(char_type* s, streamsize n);
51
52 // 27.6.2.2.4 Putback:
53 int_type sputbackc(char_type c);
54 int_type sungetc();
55
56 // 27.6.2.2.5 Put area:
57 int_type sputc(char_type c);
58 streamsize sputn(const char_type* s, streamsize n);
59
60protected:
61 basic_streambuf();
62 basic_streambuf(const basic_streambuf& rhs);
63 basic_streambuf& operator=(const basic_streambuf& rhs);
64 void swap(basic_streambuf& rhs);
65
66 // 27.6.2.3.2 Get area:
67 char_type* eback() const;
68 char_type* gptr() const;
69 char_type* egptr() const;
70 void gbump(int n);
71 void setg(char_type* gbeg, char_type* gnext, char_type* gend);
72
73 // 27.6.2.3.3 Put area:
74 char_type* pbase() const;
75 char_type* pptr() const;
76 char_type* epptr() const;
77 void pbump(int n);
78 void setp(char_type* pbeg, char_type* pend);
79
80 // 27.6.2.4 virtual functions:
81 // 27.6.2.4.1 Locales:
82 virtual void imbue(const locale& loc);
83
84 // 27.6.2.4.2 Buffer management and positioning:
85 virtual basic_streambuf* setbuf(char_type* s, streamsize n);
86 virtual pos_type seekoff(off_type off, ios_base::seekdir way,
87 ios_base::openmode which = ios_base::in | ios_base::out);
88 virtual pos_type seekpos(pos_type sp,
89 ios_base::openmode which = ios_base::in | ios_base::out);
90 virtual int sync();
91
92 // 27.6.2.4.3 Get area:
93 virtual streamsize showmanyc();
94 virtual streamsize xsgetn(char_type* s, streamsize n);
95 virtual int_type underflow();
96 virtual int_type uflow();
97
98 // 27.6.2.4.4 Putback:
99 virtual int_type pbackfail(int_type c = traits_type::eof());
100
101 // 27.6.2.4.5 Put area:
102 virtual streamsize xsputn(const char_type* s, streamsize n);
103 virtual int_type overflow (int_type c = traits_type::eof());
104};
105
106} // std
107
108*/
109
110#include <__config>
111#include <iosfwd>
112#include <ios>
113
114#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
115#pragma GCC system_header
116#endif
117
118_LIBCPP_PUSH_MACROS
119#include <__undef_macros>
120
121_LIBCPP_BEGIN_NAMESPACE_STD
122
123template <class _CharT, class _Traits>
124class _LIBCPP_TEMPLATE_VIS basic_streambuf
125{
126public:
127 // types:
128 typedef _CharT char_type;
129 typedef _Traits traits_type;
130 typedef typename traits_type::int_type int_type;
131 typedef typename traits_type::pos_type pos_type;
132 typedef typename traits_type::off_type off_type;
133
134 static_assert((is_same<_CharT, typename traits_type::char_type>::value),
135 "traits_type::char_type must be the same type as CharT");
136
137 virtual ~basic_streambuf();
138
139 // 27.6.2.2.1 locales:
140 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
141 locale pubimbue(const locale& __loc) {
142 imbue(__loc);
143 locale __r = __loc_;
144 __loc_ = __loc;
145 return __r;
146 }
147
148 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
149 locale getloc() const { return __loc_; }
150
151 // 27.6.2.2.2 buffer and positioning:
152 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
153 basic_streambuf* pubsetbuf(char_type* __s, streamsize __n)
154 { return setbuf(__s, __n); }
155
156 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
157 pos_type pubseekoff(off_type __off, ios_base::seekdir __way,
158 ios_base::openmode __which = ios_base::in | ios_base::out)
159 { return seekoff(__off, __way, __which); }
160
161 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
162 pos_type pubseekpos(pos_type __sp,
163 ios_base::openmode __which = ios_base::in | ios_base::out)
164 { return seekpos(__sp, __which); }
165
166 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
167 int pubsync() { return sync(); }
168
169 // Get and put areas:
170 // 27.6.2.2.3 Get area:
171 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
172 streamsize in_avail() {
173 if (__ninp_ < __einp_)
174 return static_cast<streamsize>(__einp_ - __ninp_);
175 return showmanyc();
176 }
177
178 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
179 int_type snextc() {
180 if (sbumpc() == traits_type::eof())
181 return traits_type::eof();
182 return sgetc();
183 }
184
185 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
186 int_type sbumpc() {
187 if (__ninp_ == __einp_)
188 return uflow();
189 return traits_type::to_int_type(*__ninp_++);
190 }
191
192 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
193 int_type sgetc() {
194 if (__ninp_ == __einp_)
195 return underflow();
196 return traits_type::to_int_type(*__ninp_);
197 }
198
199 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
200 streamsize sgetn(char_type* __s, streamsize __n)
201 { return xsgetn(__s, __n); }
202
203 // 27.6.2.2.4 Putback:
204 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
205 int_type sputbackc(char_type __c) {
206 if (__binp_ == __ninp_ || !traits_type::eq(__c, __ninp_[-1]))
207 return pbackfail(traits_type::to_int_type(__c));
208 return traits_type::to_int_type(*--__ninp_);
209 }
210
211 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
212 int_type sungetc() {
213 if (__binp_ == __ninp_)
214 return pbackfail();
215 return traits_type::to_int_type(*--__ninp_);
216 }
217
218 // 27.6.2.2.5 Put area:
219 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
220 int_type sputc(char_type __c) {
221 if (__nout_ == __eout_)
222 return overflow(traits_type::to_int_type(__c));
223 *__nout_++ = __c;
224 return traits_type::to_int_type(__c);
225 }
226
227 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
228 streamsize sputn(const char_type* __s, streamsize __n)
229 { return xsputn(__s, __n); }
230
231protected:
232 basic_streambuf();
233 basic_streambuf(const basic_streambuf& __rhs);
234 basic_streambuf& operator=(const basic_streambuf& __rhs);
235 void swap(basic_streambuf& __rhs);
236
237 // 27.6.2.3.2 Get area:
238 _LIBCPP_INLINE_VISIBILITY char_type* eback() const {return __binp_;}
239 _LIBCPP_INLINE_VISIBILITY char_type* gptr() const {return __ninp_;}
240 _LIBCPP_INLINE_VISIBILITY char_type* egptr() const {return __einp_;}
241
242 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
243 void gbump(int __n) { __ninp_ += __n; }
244
245 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
246 void setg(char_type* __gbeg, char_type* __gnext, char_type* __gend) {
247 __binp_ = __gbeg;
248 __ninp_ = __gnext;
249 __einp_ = __gend;
250 }
251
252 // 27.6.2.3.3 Put area:
253 _LIBCPP_INLINE_VISIBILITY char_type* pbase() const {return __bout_;}
254 _LIBCPP_INLINE_VISIBILITY char_type* pptr() const {return __nout_;}
255 _LIBCPP_INLINE_VISIBILITY char_type* epptr() const {return __eout_;}
256
257 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
258 void pbump(int __n) { __nout_ += __n; }
259
260 _LIBCPP_INLINE_VISIBILITY
261 void __pbump(streamsize __n) { __nout_ += __n; }
262
263 inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
264 void setp(char_type* __pbeg, char_type* __pend) {
265 __bout_ = __nout_ = __pbeg;
266 __eout_ = __pend;
267 }
268
269 // 27.6.2.4 virtual functions:
270 // 27.6.2.4.1 Locales:
271 virtual void imbue(const locale& __loc);
272
273 // 27.6.2.4.2 Buffer management and positioning:
274 virtual basic_streambuf* setbuf(char_type* __s, streamsize __n);
275 virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
276 ios_base::openmode __which = ios_base::in | ios_base::out);
277 virtual pos_type seekpos(pos_type __sp,
278 ios_base::openmode __which = ios_base::in | ios_base::out);
279 virtual int sync();
280
281 // 27.6.2.4.3 Get area:
282 virtual streamsize showmanyc();
283 virtual streamsize xsgetn(char_type* __s, streamsize __n);
284 virtual int_type underflow();
285 virtual int_type uflow();
286
287 // 27.6.2.4.4 Putback:
288 virtual int_type pbackfail(int_type __c = traits_type::eof());
289
290 // 27.6.2.4.5 Put area:
291 virtual streamsize xsputn(const char_type* __s, streamsize __n);
292 virtual int_type overflow(int_type __c = traits_type::eof());
293
294private:
295 locale __loc_;
296 char_type* __binp_;
297 char_type* __ninp_;
298 char_type* __einp_;
299 char_type* __bout_;
300 char_type* __nout_;
301 char_type* __eout_;
302};
303
304template <class _CharT, class _Traits>
305basic_streambuf<_CharT, _Traits>::~basic_streambuf()
306{
307}
308
309template <class _CharT, class _Traits>
310basic_streambuf<_CharT, _Traits>::basic_streambuf()
311 : __binp_(0),
312 __ninp_(0),
313 __einp_(0),
314 __bout_(0),
315 __nout_(0),
316 __eout_(0)
317{
318}
319
320template <class _CharT, class _Traits>
321basic_streambuf<_CharT, _Traits>::basic_streambuf(const basic_streambuf& __sb)
322 : __loc_(__sb.__loc_),
323 __binp_(__sb.__binp_),
324 __ninp_(__sb.__ninp_),
325 __einp_(__sb.__einp_),
326 __bout_(__sb.__bout_),
327 __nout_(__sb.__nout_),
328 __eout_(__sb.__eout_)
329{
330}
331
332template <class _CharT, class _Traits>
333basic_streambuf<_CharT, _Traits>&
334basic_streambuf<_CharT, _Traits>::operator=(const basic_streambuf& __sb)
335{
336 __loc_ = __sb.__loc_;
337 __binp_ = __sb.__binp_;
338 __ninp_ = __sb.__ninp_;
339 __einp_ = __sb.__einp_;
340 __bout_ = __sb.__bout_;
341 __nout_ = __sb.__nout_;
342 __eout_ = __sb.__eout_;
343 return *this;
344}
345
346template <class _CharT, class _Traits>
347void
348basic_streambuf<_CharT, _Traits>::swap(basic_streambuf& __sb)
349{
350 _VSTD::swap(__loc_, __sb.__loc_);
351 _VSTD::swap(__binp_, __sb.__binp_);
352 _VSTD::swap(__ninp_, __sb.__ninp_);
353 _VSTD::swap(__einp_, __sb.__einp_);
354 _VSTD::swap(__bout_, __sb.__bout_);
355 _VSTD::swap(__nout_, __sb.__nout_);
356 _VSTD::swap(__eout_, __sb.__eout_);
357}
358
359template <class _CharT, class _Traits>
360void
361basic_streambuf<_CharT, _Traits>::imbue(const locale&)
362{
363}
364
365template <class _CharT, class _Traits>
366basic_streambuf<_CharT, _Traits>*
367basic_streambuf<_CharT, _Traits>::setbuf(char_type*, streamsize)
368{
369 return this;
370}
371
372template <class _CharT, class _Traits>
373typename basic_streambuf<_CharT, _Traits>::pos_type
374basic_streambuf<_CharT, _Traits>::seekoff(off_type, ios_base::seekdir,
375 ios_base::openmode)
376{
377 return pos_type(off_type(-1));
378}
379
380template <class _CharT, class _Traits>
381typename basic_streambuf<_CharT, _Traits>::pos_type
382basic_streambuf<_CharT, _Traits>::seekpos(pos_type, ios_base::openmode)
383{
384 return pos_type(off_type(-1));
385}
386
387template <class _CharT, class _Traits>
388int
389basic_streambuf<_CharT, _Traits>::sync()
390{
391 return 0;
392}
393
394template <class _CharT, class _Traits>
395streamsize
396basic_streambuf<_CharT, _Traits>::showmanyc()
397{
398 return 0;
399}
400
401template <class _CharT, class _Traits>
402streamsize
403basic_streambuf<_CharT, _Traits>::xsgetn(char_type* __s, streamsize __n)
404{
405 const int_type __eof = traits_type::eof();
406 int_type __c;
407 streamsize __i = 0;
408 while(__i < __n)
409 {
410 if (__ninp_ < __einp_)
411 {
412 const streamsize __len = _VSTD::min(static_cast<streamsize>(INT_MAX),
413 _VSTD::min(__einp_ - __ninp_, __n - __i));
414 traits_type::copy(__s, __ninp_, __len);
415 __s += __len;
416 __i += __len;
417 this->gbump(__len);
418 }
419 else if ((__c = uflow()) != __eof)
420 {
421 *__s = traits_type::to_char_type(__c);
422 ++__s;
423 ++__i;
424 }
425 else
426 break;
427 }
428 return __i;
429}
430
431template <class _CharT, class _Traits>
432typename basic_streambuf<_CharT, _Traits>::int_type
433basic_streambuf<_CharT, _Traits>::underflow()
434{
435 return traits_type::eof();
436}
437
438template <class _CharT, class _Traits>
439typename basic_streambuf<_CharT, _Traits>::int_type
440basic_streambuf<_CharT, _Traits>::uflow()
441{
442 if (underflow() == traits_type::eof())
443 return traits_type::eof();
444 return traits_type::to_int_type(*__ninp_++);
445}
446
447template <class _CharT, class _Traits>
448typename basic_streambuf<_CharT, _Traits>::int_type
449basic_streambuf<_CharT, _Traits>::pbackfail(int_type)
450{
451 return traits_type::eof();
452}
453
454template <class _CharT, class _Traits>
455streamsize
456basic_streambuf<_CharT, _Traits>::xsputn(const char_type* __s, streamsize __n)
457{
458 streamsize __i = 0;
459 int_type __eof = traits_type::eof();
460 while( __i < __n)
461 {
462 if (__nout_ >= __eout_)
463 {
464 if (overflow(traits_type::to_int_type(*__s)) == __eof)
465 break;
466 ++__s;
467 ++__i;
468 }
469 else
470 {
471 streamsize __chunk_size = _VSTD::min(__eout_ - __nout_, __n - __i);
472 traits_type::copy(__nout_, __s, __chunk_size);
473 __nout_ += __chunk_size;
474 __s += __chunk_size;
475 __i += __chunk_size;
476 }
477 }
478 return __i;
479}
480
481template <class _CharT, class _Traits>
482typename basic_streambuf<_CharT, _Traits>::int_type
483basic_streambuf<_CharT, _Traits>::overflow(int_type)
484{
485 return traits_type::eof();
486}
487
488#ifndef _LIBCPP_DO_NOT_ASSUME_STREAMS_EXPLICIT_INSTANTIATION_IN_DYLIB
489_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<char>)
490_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_streambuf<wchar_t>)
491
492_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<char>)
493_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ios<wchar_t>)
494#endif
495
496_LIBCPP_END_NAMESPACE_STD
497
498_LIBCPP_POP_MACROS
499
500#endif // _LIBCPP_STEAMBUF
501