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725dc051 BK |
1 | // Streambuf iterators |
2 | ||
99dee823 | 3 | // Copyright (C) 1997-2021 Free Software Foundation, Inc. |
725dc051 BK |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
725dc051 BK |
9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
725dc051 | 24 | |
f910786b | 25 | /** @file bits/streambuf_iterator.h |
729e3d3f | 26 | * This is an internal header file, included by other library headers. |
f910786b | 27 | * Do not attempt to use it directly. @headername{iterator} |
729e3d3f PE |
28 | */ |
29 | ||
3d7c150e BK |
30 | #ifndef _STREAMBUF_ITERATOR_H |
31 | #define _STREAMBUF_ITERATOR_H 1 | |
725dc051 | 32 | |
b0a85b86 GDR |
33 | #pragma GCC system_header |
34 | ||
2e2a38cd | 35 | #include <streambuf> |
285b36d6 | 36 | #include <debug/debug.h> |
2e2a38cd | 37 | |
12ffa228 BK |
38 | namespace std _GLIBCXX_VISIBILITY(default) |
39 | { | |
40 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
e324f9cb | 41 | |
8e32aa11 BK |
42 | /** |
43 | * @addtogroup iterators | |
44 | * @{ | |
45 | */ | |
46 | ||
725dc051 | 47 | // 24.5.3 Template class istreambuf_iterator |
ffcec5c8 | 48 | /// Provides input iterator semantics for streambufs. |
39003c99 | 49 | template<typename _CharT, typename _Traits> |
725dc051 BK |
50 | class istreambuf_iterator |
51 | : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, | |
7918cb93 | 52 | _CharT*, _CharT> |
725dc051 BK |
53 | { |
54 | public: | |
725dc051 | 55 | // Types: |
f0b88346 | 56 | ///@{ |
ffcec5c8 | 57 | /// Public typedefs |
7918cb93 JW |
58 | #if __cplusplus < 201103L |
59 | typedef _CharT& reference; // Changed to _CharT by LWG 445 | |
60 | #elif __cplusplus > 201703L | |
9aeb3bef JW |
61 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
62 | // 3188. istreambuf_iterator::pointer should not be unspecified | |
63 | using pointer = void; | |
64 | #endif | |
7918cb93 | 65 | |
ed6814f7 BI |
66 | typedef _CharT char_type; |
67 | typedef _Traits traits_type; | |
68 | typedef typename _Traits::int_type int_type; | |
69 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; | |
70 | typedef basic_istream<_CharT, _Traits> istream_type; | |
f0b88346 | 71 | ///@} |
725dc051 | 72 | |
0002d5d2 | 73 | template<typename _CharT2> |
105c6331 | 74 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
e324f9cb | 75 | ostreambuf_iterator<_CharT2> >::__type |
0002d5d2 PC |
76 | copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
77 | ostreambuf_iterator<_CharT2>); | |
78 | ||
f0112db9 | 79 | template<bool _IsMove, typename _CharT2> |
e324f9cb | 80 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
105c6331 | 81 | _CharT2*>::__type |
f0112db9 PC |
82 | __copy_move_a2(istreambuf_iterator<_CharT2>, |
83 | istreambuf_iterator<_CharT2>, _CharT2*); | |
0002d5d2 | 84 | |
8ab38f6c | 85 | template<typename _CharT2, typename _Size> |
4e05c918 FD |
86 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
87 | _CharT2*>::__type | |
88 | __copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool); | |
8ab38f6c | 89 | |
0002d5d2 | 90 | template<typename _CharT2> |
105c6331 | 91 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
e324f9cb | 92 | istreambuf_iterator<_CharT2> >::__type |
0002d5d2 | 93 | find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
976e25f4 | 94 | const _CharT2&); |
0002d5d2 | 95 | |
e324f9cb FD |
96 | template<typename _CharT2, typename _Distance> |
97 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, | |
98 | void>::__type | |
99 | advance(istreambuf_iterator<_CharT2>&, _Distance); | |
100 | ||
39003c99 | 101 | private: |
ed6814f7 BI |
102 | // 24.5.3 istreambuf_iterator |
103 | // p 1 | |
39003c99 BK |
104 | // If the end of stream is reached (streambuf_type::sgetc() |
105 | // returns traits_type::eof()), the iterator becomes equal to | |
106 | // the "end of stream" iterator value. | |
107 | // NB: This implementation assumes the "end of stream" value | |
108 | // is EOF, or -1. | |
ed6814f7 | 109 | mutable streambuf_type* _M_sbuf; |
4e914524 | 110 | int_type _M_c; |
39003c99 BK |
111 | |
112 | public: | |
ffcec5c8 | 113 | /// Construct end of input stream iterator. |
23e4c4ee | 114 | _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT |
f13a69ec | 115 | : _M_sbuf(0), _M_c(traits_type::eof()) { } |
ed6814f7 | 116 | |
07522ae9 | 117 | #if __cplusplus > 201703L && __cpp_lib_concepts |
120e8734 JW |
118 | constexpr istreambuf_iterator(default_sentinel_t) noexcept |
119 | : istreambuf_iterator() { } | |
120 | #endif | |
121 | ||
734f5023 | 122 | #if __cplusplus >= 201103L |
23e4c4ee PC |
123 | istreambuf_iterator(const istreambuf_iterator&) noexcept = default; |
124 | ||
125 | ~istreambuf_iterator() = default; | |
126 | #endif | |
127 | ||
ffcec5c8 | 128 | /// Construct start of input stream iterator. |
23e4c4ee | 129 | istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT |
f13a69ec | 130 | : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { } |
725dc051 | 131 | |
ffcec5c8 | 132 | /// Construct start of streambuf iterator. |
23e4c4ee | 133 | istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT |
f13a69ec | 134 | : _M_sbuf(__s), _M_c(traits_type::eof()) { } |
ed6814f7 | 135 | |
a1417556 JW |
136 | #if __cplusplus >= 201103L |
137 | istreambuf_iterator& | |
138 | operator=(const istreambuf_iterator&) noexcept = default; | |
139 | #endif | |
140 | ||
ffcec5c8 JQ |
141 | /// Return the current character pointed to by iterator. This returns |
142 | /// streambuf.sgetc(). It cannot be assigned. NB: The result of | |
143 | /// operator*() on an end of stream is undefined. | |
ed6814f7 | 144 | char_type |
725dc051 | 145 | operator*() const |
ed6814f7 | 146 | { |
4e914524 PO |
147 | int_type __c = _M_get(); |
148 | ||
285b36d6 BK |
149 | #ifdef _GLIBCXX_DEBUG_PEDANTIC |
150 | // Dereferencing a past-the-end istreambuf_iterator is a | |
151 | // libstdc++ extension | |
4e914524 | 152 | __glibcxx_requires_cond(!_S_is_eof(__c), |
285b36d6 | 153 | _M_message(__gnu_debug::__msg_deref_istreambuf) |
ed6814f7 | 154 | ._M_iterator(*this)); |
285b36d6 | 155 | #endif |
4e914524 | 156 | return traits_type::to_char_type(__c); |
285b36d6 | 157 | } |
ffcec5c8 JQ |
158 | |
159 | /// Advance the iterator. Calls streambuf.sbumpc(). | |
ed6814f7 | 160 | istreambuf_iterator& |
725dc051 | 161 | operator++() |
ed6814f7 | 162 | { |
4e914524 PO |
163 | __glibcxx_requires_cond(_M_sbuf && |
164 | (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), | |
285b36d6 | 165 | _M_message(__gnu_debug::__msg_inc_istreambuf) |
ed6814f7 | 166 | ._M_iterator(*this)); |
4e914524 PO |
167 | |
168 | _M_sbuf->sbumpc(); | |
169 | _M_c = traits_type::eof(); | |
ed6814f7 | 170 | return *this; |
725dc051 BK |
171 | } |
172 | ||
ffcec5c8 | 173 | /// Advance the iterator. Calls streambuf.sbumpc(). |
b581eaf7 | 174 | istreambuf_iterator |
725dc051 BK |
175 | operator++(int) |
176 | { | |
4e914524 PO |
177 | __glibcxx_requires_cond(_M_sbuf && |
178 | (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), | |
285b36d6 | 179 | _M_message(__gnu_debug::__msg_inc_istreambuf) |
ed6814f7 | 180 | ._M_iterator(*this)); |
285b36d6 | 181 | |
b581eaf7 | 182 | istreambuf_iterator __old = *this; |
4e914524 PO |
183 | __old._M_c = _M_sbuf->sbumpc(); |
184 | _M_c = traits_type::eof(); | |
ed6814f7 | 185 | return __old; |
725dc051 | 186 | } |
725dc051 | 187 | |
f5677b15 | 188 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
725dc051 | 189 | // 110 istreambuf_iterator::equal not const |
0e7300bb | 190 | // NB: there is also number 111 (NAD) relevant to this function. |
ffcec5c8 | 191 | /// Return true both iterators are end or both are not end. |
ed6814f7 | 192 | bool |
b581eaf7 | 193 | equal(const istreambuf_iterator& __b) const |
6bfcbf0d | 194 | { return _M_at_eof() == __b._M_at_eof(); } |
9875ea05 BK |
195 | |
196 | private: | |
ed6814f7 | 197 | int_type |
9875ea05 | 198 | _M_get() const |
ed6814f7 | 199 | { |
4e914524 PO |
200 | int_type __ret = _M_c; |
201 | if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc())) | |
202 | _M_sbuf = 0; | |
9875ea05 BK |
203 | return __ret; |
204 | } | |
285b36d6 | 205 | |
ed6814f7 | 206 | bool |
285b36d6 | 207 | _M_at_eof() const |
4e914524 PO |
208 | { return _S_is_eof(_M_get()); } |
209 | ||
210 | static bool | |
211 | _S_is_eof(int_type __c) | |
285b36d6 BK |
212 | { |
213 | const int_type __eof = traits_type::eof(); | |
4e914524 | 214 | return traits_type::eq_int_type(__c, __eof); |
285b36d6 | 215 | } |
120e8734 | 216 | |
07522ae9 | 217 | #if __cplusplus > 201703L && __cpp_lib_concepts |
120e8734 JW |
218 | friend bool |
219 | operator==(const istreambuf_iterator& __i, default_sentinel_t __s) | |
220 | { return __i._M_at_eof(); } | |
221 | #endif | |
725dc051 BK |
222 | }; |
223 | ||
224 | template<typename _CharT, typename _Traits> | |
ed6814f7 | 225 | inline bool |
725dc051 BK |
226 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, |
227 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
228 | { return __a.equal(__b); } | |
229 | ||
230 | template<typename _CharT, typename _Traits> | |
ed6814f7 | 231 | inline bool |
725dc051 BK |
232 | operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, |
233 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
234 | { return !__a.equal(__b); } | |
5c352a47 | 235 | |
ffcec5c8 | 236 | /// Provides output iterator semantics for streambufs. |
5c352a47 BK |
237 | template<typename _CharT, typename _Traits> |
238 | class ostreambuf_iterator | |
239 | : public iterator<output_iterator_tag, void, void, void, void> | |
240 | { | |
241 | public: | |
242 | // Types: | |
f0b88346 | 243 | ///@{ |
ffcec5c8 | 244 | /// Public typedefs |
9aeb3bef JW |
245 | #if __cplusplus > 201703L |
246 | using difference_type = ptrdiff_t; | |
247 | #endif | |
e324f9cb FD |
248 | typedef _CharT char_type; |
249 | typedef _Traits traits_type; | |
5c352a47 BK |
250 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; |
251 | typedef basic_ostream<_CharT, _Traits> ostream_type; | |
f0b88346 | 252 | ///@} |
5c352a47 | 253 | |
0002d5d2 | 254 | template<typename _CharT2> |
105c6331 | 255 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
e324f9cb | 256 | ostreambuf_iterator<_CharT2> >::__type |
0002d5d2 PC |
257 | copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
258 | ostreambuf_iterator<_CharT2>); | |
259 | ||
5c352a47 | 260 | private: |
ed6814f7 BI |
261 | streambuf_type* _M_sbuf; |
262 | bool _M_failed; | |
5c352a47 BK |
263 | |
264 | public: | |
9aeb3bef JW |
265 | |
266 | #if __cplusplus > 201703L | |
267 | constexpr | |
268 | ostreambuf_iterator() noexcept | |
269 | : _M_sbuf(nullptr), _M_failed(true) { } | |
270 | #endif | |
271 | ||
ffcec5c8 | 272 | /// Construct output iterator from ostream. |
23e4c4ee | 273 | ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT |
5c352a47 | 274 | : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } |
ed6814f7 | 275 | |
ffcec5c8 | 276 | /// Construct output iterator from streambuf. |
23e4c4ee | 277 | ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT |
5c352a47 BK |
278 | : _M_sbuf(__s), _M_failed(!_M_sbuf) { } |
279 | ||
ffcec5c8 | 280 | /// Write character to streambuf. Calls streambuf.sputc(). |
ed6814f7 | 281 | ostreambuf_iterator& |
2e2a38cd BK |
282 | operator=(_CharT __c) |
283 | { | |
ed6814f7 | 284 | if (!_M_failed && |
2e2a38cd BK |
285 | _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) |
286 | _M_failed = true; | |
287 | return *this; | |
288 | } | |
5c352a47 | 289 | |
ffcec5c8 | 290 | /// Return *this. |
ed6814f7 | 291 | ostreambuf_iterator& |
e0ec69c9 | 292 | operator*() |
5c352a47 BK |
293 | { return *this; } |
294 | ||
ffcec5c8 | 295 | /// Return *this. |
ed6814f7 | 296 | ostreambuf_iterator& |
e0ec69c9 | 297 | operator++(int) |
5c352a47 BK |
298 | { return *this; } |
299 | ||
ffcec5c8 | 300 | /// Return *this. |
ed6814f7 | 301 | ostreambuf_iterator& |
e0ec69c9 | 302 | operator++() |
5c352a47 BK |
303 | { return *this; } |
304 | ||
ffcec5c8 | 305 | /// Return true if previous operator=() failed. |
ed6814f7 | 306 | bool |
23e4c4ee | 307 | failed() const _GLIBCXX_USE_NOEXCEPT |
5c352a47 | 308 | { return _M_failed; } |
5c352a47 | 309 | |
ed6814f7 | 310 | ostreambuf_iterator& |
2e2a38cd BK |
311 | _M_put(const _CharT* __ws, streamsize __len) |
312 | { | |
53279c10 | 313 | if (__builtin_expect(!_M_failed, true) |
15d72060 PC |
314 | && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len, |
315 | false)) | |
53279c10 | 316 | _M_failed = true; |
2e2a38cd BK |
317 | return *this; |
318 | } | |
319 | }; | |
3cbc7af0 | 320 | |
0002d5d2 PC |
321 | // Overloads for streambuf iterators. |
322 | template<typename _CharT> | |
105c6331 | 323 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
e324f9cb | 324 | ostreambuf_iterator<_CharT> >::__type |
0002d5d2 PC |
325 | copy(istreambuf_iterator<_CharT> __first, |
326 | istreambuf_iterator<_CharT> __last, | |
327 | ostreambuf_iterator<_CharT> __result) | |
328 | { | |
329 | if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed) | |
330 | { | |
331 | bool __ineof; | |
332 | __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof); | |
333 | if (!__ineof) | |
334 | __result._M_failed = true; | |
335 | } | |
336 | return __result; | |
337 | } | |
338 | ||
f0112db9 | 339 | template<bool _IsMove, typename _CharT> |
e324f9cb FD |
340 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
341 | ostreambuf_iterator<_CharT> >::__type | |
f0112db9 PC |
342 | __copy_move_a2(_CharT* __first, _CharT* __last, |
343 | ostreambuf_iterator<_CharT> __result) | |
0002d5d2 PC |
344 | { |
345 | const streamsize __num = __last - __first; | |
346 | if (__num > 0) | |
347 | __result._M_put(__first, __num); | |
348 | return __result; | |
349 | } | |
350 | ||
f0112db9 | 351 | template<bool _IsMove, typename _CharT> |
105c6331 BK |
352 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
353 | ostreambuf_iterator<_CharT> >::__type | |
f0112db9 PC |
354 | __copy_move_a2(const _CharT* __first, const _CharT* __last, |
355 | ostreambuf_iterator<_CharT> __result) | |
0002d5d2 PC |
356 | { |
357 | const streamsize __num = __last - __first; | |
358 | if (__num > 0) | |
359 | __result._M_put(__first, __num); | |
360 | return __result; | |
361 | } | |
362 | ||
f0112db9 | 363 | template<bool _IsMove, typename _CharT> |
e324f9cb FD |
364 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
365 | _CharT*>::__type | |
f0112db9 PC |
366 | __copy_move_a2(istreambuf_iterator<_CharT> __first, |
367 | istreambuf_iterator<_CharT> __last, _CharT* __result) | |
0002d5d2 | 368 | { |
e324f9cb FD |
369 | typedef istreambuf_iterator<_CharT> __is_iterator_type; |
370 | typedef typename __is_iterator_type::traits_type traits_type; | |
0002d5d2 | 371 | typedef typename __is_iterator_type::streambuf_type streambuf_type; |
e324f9cb | 372 | typedef typename traits_type::int_type int_type; |
0002d5d2 PC |
373 | |
374 | if (__first._M_sbuf && !__last._M_sbuf) | |
375 | { | |
376 | streambuf_type* __sb = __first._M_sbuf; | |
377 | int_type __c = __sb->sgetc(); | |
378 | while (!traits_type::eq_int_type(__c, traits_type::eof())) | |
379 | { | |
380 | const streamsize __n = __sb->egptr() - __sb->gptr(); | |
381 | if (__n > 1) | |
382 | { | |
383 | traits_type::copy(__result, __sb->gptr(), __n); | |
1139a735 | 384 | __sb->__safe_gbump(__n); |
0002d5d2 PC |
385 | __result += __n; |
386 | __c = __sb->underflow(); | |
387 | } | |
388 | else | |
389 | { | |
390 | *__result++ = traits_type::to_char_type(__c); | |
391 | __c = __sb->snextc(); | |
392 | } | |
393 | } | |
394 | } | |
395 | return __result; | |
396 | } | |
397 | ||
8ab38f6c | 398 | template<typename _CharT, typename _Size> |
4e05c918 FD |
399 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
400 | _CharT*>::__type | |
401 | __copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result, | |
402 | bool __strict __attribute__((__unused__))) | |
8ab38f6c FD |
403 | { |
404 | if (__n == 0) | |
405 | return __result; | |
406 | ||
407 | __glibcxx_requires_cond(__it._M_sbuf, | |
408 | _M_message(__gnu_debug::__msg_inc_istreambuf) | |
409 | ._M_iterator(__it)); | |
410 | _CharT* __beg = __result; | |
411 | __result += __it._M_sbuf->sgetn(__beg, __n); | |
4e05c918 | 412 | __glibcxx_requires_cond(!__strict || __result - __beg == __n, |
8ab38f6c FD |
413 | _M_message(__gnu_debug::__msg_inc_istreambuf) |
414 | ._M_iterator(__it)); | |
415 | return __result; | |
416 | } | |
8ab38f6c | 417 | |
0002d5d2 | 418 | template<typename _CharT> |
105c6331 BK |
419 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
420 | istreambuf_iterator<_CharT> >::__type | |
0002d5d2 | 421 | find(istreambuf_iterator<_CharT> __first, |
976e25f4 | 422 | istreambuf_iterator<_CharT> __last, const _CharT& __val) |
0002d5d2 | 423 | { |
e324f9cb | 424 | typedef istreambuf_iterator<_CharT> __is_iterator_type; |
0002d5d2 PC |
425 | typedef typename __is_iterator_type::traits_type traits_type; |
426 | typedef typename __is_iterator_type::streambuf_type streambuf_type; | |
e324f9cb | 427 | typedef typename traits_type::int_type int_type; |
4e914524 | 428 | const int_type __eof = traits_type::eof(); |
0002d5d2 PC |
429 | |
430 | if (__first._M_sbuf && !__last._M_sbuf) | |
431 | { | |
432 | const int_type __ival = traits_type::to_int_type(__val); | |
433 | streambuf_type* __sb = __first._M_sbuf; | |
434 | int_type __c = __sb->sgetc(); | |
4e914524 | 435 | while (!traits_type::eq_int_type(__c, __eof) |
0002d5d2 PC |
436 | && !traits_type::eq_int_type(__c, __ival)) |
437 | { | |
438 | streamsize __n = __sb->egptr() - __sb->gptr(); | |
439 | if (__n > 1) | |
440 | { | |
441 | const _CharT* __p = traits_type::find(__sb->gptr(), | |
442 | __n, __val); | |
443 | if (__p) | |
444 | __n = __p - __sb->gptr(); | |
1139a735 | 445 | __sb->__safe_gbump(__n); |
0002d5d2 PC |
446 | __c = __sb->sgetc(); |
447 | } | |
448 | else | |
449 | __c = __sb->snextc(); | |
450 | } | |
451 | ||
4e914524 | 452 | __first._M_c = __eof; |
0002d5d2 | 453 | } |
4e914524 | 454 | |
0002d5d2 PC |
455 | return __first; |
456 | } | |
457 | ||
e324f9cb FD |
458 | template<typename _CharT, typename _Distance> |
459 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, | |
460 | void>::__type | |
461 | advance(istreambuf_iterator<_CharT>& __i, _Distance __n) | |
462 | { | |
463 | if (__n == 0) | |
464 | return; | |
465 | ||
466 | __glibcxx_assert(__n > 0); | |
467 | __glibcxx_requires_cond(!__i._M_at_eof(), | |
468 | _M_message(__gnu_debug::__msg_inc_istreambuf) | |
469 | ._M_iterator(__i)); | |
470 | ||
471 | typedef istreambuf_iterator<_CharT> __is_iterator_type; | |
472 | typedef typename __is_iterator_type::traits_type traits_type; | |
473 | typedef typename __is_iterator_type::streambuf_type streambuf_type; | |
474 | typedef typename traits_type::int_type int_type; | |
475 | const int_type __eof = traits_type::eof(); | |
476 | ||
477 | streambuf_type* __sb = __i._M_sbuf; | |
478 | while (__n > 0) | |
479 | { | |
480 | streamsize __size = __sb->egptr() - __sb->gptr(); | |
481 | if (__size > __n) | |
482 | { | |
483 | __sb->__safe_gbump(__n); | |
484 | break; | |
485 | } | |
486 | ||
487 | __sb->__safe_gbump(__size); | |
488 | __n -= __size; | |
489 | if (traits_type::eq_int_type(__sb->underflow(), __eof)) | |
490 | { | |
491 | __glibcxx_requires_cond(__n == 0, | |
492 | _M_message(__gnu_debug::__msg_inc_istreambuf) | |
493 | ._M_iterator(__i)); | |
494 | break; | |
495 | } | |
496 | } | |
497 | ||
498 | __i._M_c = __eof; | |
499 | } | |
500 | ||
8e32aa11 BK |
501 | // @} group iterators |
502 | ||
12ffa228 BK |
503 | _GLIBCXX_END_NAMESPACE_VERSION |
504 | } // namespace | |
3cbc7af0 | 505 | |
b85381b9 | 506 | #endif |