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725dc051 BK |
1 | // Streambuf iterators |
2 | ||
a945c346 | 3 | // Copyright (C) 1997-2024 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> |
d31e19e4 | 36 | #include <bits/stl_iterator_base_types.h> |
285b36d6 | 37 | #include <debug/debug.h> |
2e2a38cd | 38 | |
12ffa228 BK |
39 | namespace std _GLIBCXX_VISIBILITY(default) |
40 | { | |
41 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
e324f9cb | 42 | |
8e32aa11 BK |
43 | /** |
44 | * @addtogroup iterators | |
45 | * @{ | |
46 | */ | |
47 | ||
de196e5d JW |
48 | // Ignore warnings about std::iterator. |
49 | #pragma GCC diagnostic push | |
50 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
725dc051 | 51 | // 24.5.3 Template class istreambuf_iterator |
ffcec5c8 | 52 | /// Provides input iterator semantics for streambufs. |
39003c99 | 53 | template<typename _CharT, typename _Traits> |
725dc051 BK |
54 | class istreambuf_iterator |
55 | : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, | |
7918cb93 | 56 | _CharT*, _CharT> |
725dc051 BK |
57 | { |
58 | public: | |
725dc051 | 59 | // Types: |
f0b88346 | 60 | ///@{ |
ffcec5c8 | 61 | /// Public typedefs |
7918cb93 JW |
62 | #if __cplusplus < 201103L |
63 | typedef _CharT& reference; // Changed to _CharT by LWG 445 | |
64 | #elif __cplusplus > 201703L | |
9aeb3bef JW |
65 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
66 | // 3188. istreambuf_iterator::pointer should not be unspecified | |
67 | using pointer = void; | |
68 | #endif | |
7918cb93 | 69 | |
ed6814f7 BI |
70 | typedef _CharT char_type; |
71 | typedef _Traits traits_type; | |
72 | typedef typename _Traits::int_type int_type; | |
73 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; | |
74 | typedef basic_istream<_CharT, _Traits> istream_type; | |
f0b88346 | 75 | ///@} |
725dc051 | 76 | |
0002d5d2 | 77 | template<typename _CharT2> |
105c6331 | 78 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
e324f9cb | 79 | ostreambuf_iterator<_CharT2> >::__type |
0002d5d2 PC |
80 | copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
81 | ostreambuf_iterator<_CharT2>); | |
82 | ||
f0112db9 | 83 | template<bool _IsMove, typename _CharT2> |
e324f9cb | 84 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
105c6331 | 85 | _CharT2*>::__type |
f0112db9 PC |
86 | __copy_move_a2(istreambuf_iterator<_CharT2>, |
87 | istreambuf_iterator<_CharT2>, _CharT2*); | |
0002d5d2 | 88 | |
8ab38f6c | 89 | template<typename _CharT2, typename _Size> |
4e05c918 FD |
90 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
91 | _CharT2*>::__type | |
92 | __copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool); | |
8ab38f6c | 93 | |
0002d5d2 | 94 | template<typename _CharT2> |
105c6331 | 95 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
e324f9cb | 96 | istreambuf_iterator<_CharT2> >::__type |
0002d5d2 | 97 | find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
976e25f4 | 98 | const _CharT2&); |
0002d5d2 | 99 | |
e324f9cb FD |
100 | template<typename _CharT2, typename _Distance> |
101 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, | |
102 | void>::__type | |
103 | advance(istreambuf_iterator<_CharT2>&, _Distance); | |
104 | ||
39003c99 | 105 | private: |
ed6814f7 BI |
106 | // 24.5.3 istreambuf_iterator |
107 | // p 1 | |
39003c99 BK |
108 | // If the end of stream is reached (streambuf_type::sgetc() |
109 | // returns traits_type::eof()), the iterator becomes equal to | |
110 | // the "end of stream" iterator value. | |
111 | // NB: This implementation assumes the "end of stream" value | |
112 | // is EOF, or -1. | |
ed6814f7 | 113 | mutable streambuf_type* _M_sbuf; |
4e914524 | 114 | int_type _M_c; |
39003c99 BK |
115 | |
116 | public: | |
ffcec5c8 | 117 | /// Construct end of input stream iterator. |
23e4c4ee | 118 | _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT |
f13a69ec | 119 | : _M_sbuf(0), _M_c(traits_type::eof()) { } |
ed6814f7 | 120 | |
07522ae9 | 121 | #if __cplusplus > 201703L && __cpp_lib_concepts |
120e8734 JW |
122 | constexpr istreambuf_iterator(default_sentinel_t) noexcept |
123 | : istreambuf_iterator() { } | |
124 | #endif | |
125 | ||
734f5023 | 126 | #if __cplusplus >= 201103L |
23e4c4ee PC |
127 | istreambuf_iterator(const istreambuf_iterator&) noexcept = default; |
128 | ||
129 | ~istreambuf_iterator() = default; | |
130 | #endif | |
131 | ||
ffcec5c8 | 132 | /// Construct start of input stream iterator. |
23e4c4ee | 133 | istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT |
f13a69ec | 134 | : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { } |
725dc051 | 135 | |
ffcec5c8 | 136 | /// Construct start of streambuf iterator. |
23e4c4ee | 137 | istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT |
f13a69ec | 138 | : _M_sbuf(__s), _M_c(traits_type::eof()) { } |
ed6814f7 | 139 | |
a1417556 JW |
140 | #if __cplusplus >= 201103L |
141 | istreambuf_iterator& | |
142 | operator=(const istreambuf_iterator&) noexcept = default; | |
143 | #endif | |
144 | ||
ffcec5c8 JQ |
145 | /// Return the current character pointed to by iterator. This returns |
146 | /// streambuf.sgetc(). It cannot be assigned. NB: The result of | |
147 | /// operator*() on an end of stream is undefined. | |
240b01b0 | 148 | _GLIBCXX_NODISCARD |
ed6814f7 | 149 | char_type |
725dc051 | 150 | operator*() const |
ed6814f7 | 151 | { |
4e914524 PO |
152 | int_type __c = _M_get(); |
153 | ||
285b36d6 BK |
154 | #ifdef _GLIBCXX_DEBUG_PEDANTIC |
155 | // Dereferencing a past-the-end istreambuf_iterator is a | |
156 | // libstdc++ extension | |
4e914524 | 157 | __glibcxx_requires_cond(!_S_is_eof(__c), |
285b36d6 | 158 | _M_message(__gnu_debug::__msg_deref_istreambuf) |
ed6814f7 | 159 | ._M_iterator(*this)); |
285b36d6 | 160 | #endif |
4e914524 | 161 | return traits_type::to_char_type(__c); |
285b36d6 | 162 | } |
ffcec5c8 JQ |
163 | |
164 | /// Advance the iterator. Calls streambuf.sbumpc(). | |
ed6814f7 | 165 | istreambuf_iterator& |
725dc051 | 166 | operator++() |
ed6814f7 | 167 | { |
4e914524 PO |
168 | __glibcxx_requires_cond(_M_sbuf && |
169 | (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), | |
285b36d6 | 170 | _M_message(__gnu_debug::__msg_inc_istreambuf) |
ed6814f7 | 171 | ._M_iterator(*this)); |
4e914524 PO |
172 | |
173 | _M_sbuf->sbumpc(); | |
174 | _M_c = traits_type::eof(); | |
ed6814f7 | 175 | return *this; |
725dc051 BK |
176 | } |
177 | ||
ffcec5c8 | 178 | /// Advance the iterator. Calls streambuf.sbumpc(). |
b581eaf7 | 179 | istreambuf_iterator |
725dc051 BK |
180 | operator++(int) |
181 | { | |
4e914524 PO |
182 | __glibcxx_requires_cond(_M_sbuf && |
183 | (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())), | |
285b36d6 | 184 | _M_message(__gnu_debug::__msg_inc_istreambuf) |
ed6814f7 | 185 | ._M_iterator(*this)); |
285b36d6 | 186 | |
b581eaf7 | 187 | istreambuf_iterator __old = *this; |
4e914524 PO |
188 | __old._M_c = _M_sbuf->sbumpc(); |
189 | _M_c = traits_type::eof(); | |
ed6814f7 | 190 | return __old; |
725dc051 | 191 | } |
725dc051 | 192 | |
f5677b15 | 193 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
725dc051 | 194 | // 110 istreambuf_iterator::equal not const |
0e7300bb | 195 | // NB: there is also number 111 (NAD) relevant to this function. |
ffcec5c8 | 196 | /// Return true both iterators are end or both are not end. |
240b01b0 | 197 | _GLIBCXX_NODISCARD |
ed6814f7 | 198 | bool |
b581eaf7 | 199 | equal(const istreambuf_iterator& __b) const |
6bfcbf0d | 200 | { return _M_at_eof() == __b._M_at_eof(); } |
9875ea05 BK |
201 | |
202 | private: | |
ed6814f7 | 203 | int_type |
9875ea05 | 204 | _M_get() const |
ed6814f7 | 205 | { |
4e914524 PO |
206 | int_type __ret = _M_c; |
207 | if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc())) | |
208 | _M_sbuf = 0; | |
9875ea05 BK |
209 | return __ret; |
210 | } | |
285b36d6 | 211 | |
ed6814f7 | 212 | bool |
285b36d6 | 213 | _M_at_eof() const |
4e914524 PO |
214 | { return _S_is_eof(_M_get()); } |
215 | ||
216 | static bool | |
217 | _S_is_eof(int_type __c) | |
285b36d6 BK |
218 | { |
219 | const int_type __eof = traits_type::eof(); | |
4e914524 | 220 | return traits_type::eq_int_type(__c, __eof); |
285b36d6 | 221 | } |
120e8734 | 222 | |
07522ae9 | 223 | #if __cplusplus > 201703L && __cpp_lib_concepts |
240b01b0 | 224 | [[nodiscard]] |
120e8734 | 225 | friend bool |
af89c779 | 226 | operator==(const istreambuf_iterator& __i, default_sentinel_t) |
120e8734 JW |
227 | { return __i._M_at_eof(); } |
228 | #endif | |
725dc051 BK |
229 | }; |
230 | ||
231 | template<typename _CharT, typename _Traits> | |
240b01b0 | 232 | _GLIBCXX_NODISCARD |
ed6814f7 | 233 | inline bool |
725dc051 BK |
234 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, |
235 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
236 | { return __a.equal(__b); } | |
237 | ||
240b01b0 | 238 | #if __cpp_impl_three_way_comparison < 201907L |
725dc051 | 239 | template<typename _CharT, typename _Traits> |
240b01b0 | 240 | _GLIBCXX_NODISCARD |
ed6814f7 | 241 | inline bool |
725dc051 BK |
242 | operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, |
243 | const istreambuf_iterator<_CharT, _Traits>& __b) | |
244 | { return !__a.equal(__b); } | |
240b01b0 | 245 | #endif |
5c352a47 | 246 | |
ffcec5c8 | 247 | /// Provides output iterator semantics for streambufs. |
5c352a47 BK |
248 | template<typename _CharT, typename _Traits> |
249 | class ostreambuf_iterator | |
250 | : public iterator<output_iterator_tag, void, void, void, void> | |
251 | { | |
252 | public: | |
253 | // Types: | |
f0b88346 | 254 | ///@{ |
ffcec5c8 | 255 | /// Public typedefs |
9aeb3bef JW |
256 | #if __cplusplus > 201703L |
257 | using difference_type = ptrdiff_t; | |
258 | #endif | |
e324f9cb FD |
259 | typedef _CharT char_type; |
260 | typedef _Traits traits_type; | |
5c352a47 BK |
261 | typedef basic_streambuf<_CharT, _Traits> streambuf_type; |
262 | typedef basic_ostream<_CharT, _Traits> ostream_type; | |
f0b88346 | 263 | ///@} |
5c352a47 | 264 | |
0002d5d2 | 265 | template<typename _CharT2> |
105c6331 | 266 | friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, |
e324f9cb | 267 | ostreambuf_iterator<_CharT2> >::__type |
0002d5d2 PC |
268 | copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>, |
269 | ostreambuf_iterator<_CharT2>); | |
270 | ||
5c352a47 | 271 | private: |
ed6814f7 BI |
272 | streambuf_type* _M_sbuf; |
273 | bool _M_failed; | |
5c352a47 BK |
274 | |
275 | public: | |
9aeb3bef JW |
276 | |
277 | #if __cplusplus > 201703L | |
278 | constexpr | |
279 | ostreambuf_iterator() noexcept | |
280 | : _M_sbuf(nullptr), _M_failed(true) { } | |
281 | #endif | |
282 | ||
ffcec5c8 | 283 | /// Construct output iterator from ostream. |
23e4c4ee | 284 | ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT |
5c352a47 | 285 | : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { } |
ed6814f7 | 286 | |
ffcec5c8 | 287 | /// Construct output iterator from streambuf. |
23e4c4ee | 288 | ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT |
5c352a47 BK |
289 | : _M_sbuf(__s), _M_failed(!_M_sbuf) { } |
290 | ||
ffcec5c8 | 291 | /// Write character to streambuf. Calls streambuf.sputc(). |
ed6814f7 | 292 | ostreambuf_iterator& |
2e2a38cd BK |
293 | operator=(_CharT __c) |
294 | { | |
ed6814f7 | 295 | if (!_M_failed && |
2e2a38cd BK |
296 | _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof())) |
297 | _M_failed = true; | |
298 | return *this; | |
299 | } | |
5c352a47 | 300 | |
ffcec5c8 | 301 | /// Return *this. |
240b01b0 | 302 | _GLIBCXX_NODISCARD |
ed6814f7 | 303 | ostreambuf_iterator& |
e0ec69c9 | 304 | operator*() |
5c352a47 BK |
305 | { return *this; } |
306 | ||
ffcec5c8 | 307 | /// Return *this. |
ed6814f7 | 308 | ostreambuf_iterator& |
e0ec69c9 | 309 | operator++(int) |
5c352a47 BK |
310 | { return *this; } |
311 | ||
ffcec5c8 | 312 | /// Return *this. |
ed6814f7 | 313 | ostreambuf_iterator& |
e0ec69c9 | 314 | operator++() |
5c352a47 BK |
315 | { return *this; } |
316 | ||
ffcec5c8 | 317 | /// Return true if previous operator=() failed. |
240b01b0 | 318 | _GLIBCXX_NODISCARD |
ed6814f7 | 319 | bool |
23e4c4ee | 320 | failed() const _GLIBCXX_USE_NOEXCEPT |
5c352a47 | 321 | { return _M_failed; } |
5c352a47 | 322 | |
ed6814f7 | 323 | ostreambuf_iterator& |
2e2a38cd BK |
324 | _M_put(const _CharT* __ws, streamsize __len) |
325 | { | |
53279c10 | 326 | if (__builtin_expect(!_M_failed, true) |
15d72060 PC |
327 | && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len, |
328 | false)) | |
53279c10 | 329 | _M_failed = true; |
2e2a38cd BK |
330 | return *this; |
331 | } | |
332 | }; | |
de196e5d | 333 | #pragma GCC diagnostic pop |
3cbc7af0 | 334 | |
0002d5d2 PC |
335 | // Overloads for streambuf iterators. |
336 | template<typename _CharT> | |
105c6331 | 337 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
e324f9cb | 338 | ostreambuf_iterator<_CharT> >::__type |
0002d5d2 PC |
339 | copy(istreambuf_iterator<_CharT> __first, |
340 | istreambuf_iterator<_CharT> __last, | |
341 | ostreambuf_iterator<_CharT> __result) | |
342 | { | |
343 | if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed) | |
344 | { | |
345 | bool __ineof; | |
346 | __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof); | |
347 | if (!__ineof) | |
348 | __result._M_failed = true; | |
349 | } | |
350 | return __result; | |
351 | } | |
352 | ||
f0112db9 | 353 | template<bool _IsMove, typename _CharT> |
e324f9cb FD |
354 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
355 | ostreambuf_iterator<_CharT> >::__type | |
f0112db9 PC |
356 | __copy_move_a2(_CharT* __first, _CharT* __last, |
357 | ostreambuf_iterator<_CharT> __result) | |
0002d5d2 PC |
358 | { |
359 | const streamsize __num = __last - __first; | |
360 | if (__num > 0) | |
361 | __result._M_put(__first, __num); | |
362 | return __result; | |
363 | } | |
364 | ||
f0112db9 | 365 | template<bool _IsMove, typename _CharT> |
105c6331 BK |
366 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
367 | ostreambuf_iterator<_CharT> >::__type | |
f0112db9 PC |
368 | __copy_move_a2(const _CharT* __first, const _CharT* __last, |
369 | ostreambuf_iterator<_CharT> __result) | |
0002d5d2 PC |
370 | { |
371 | const streamsize __num = __last - __first; | |
372 | if (__num > 0) | |
373 | __result._M_put(__first, __num); | |
374 | return __result; | |
375 | } | |
376 | ||
f0112db9 | 377 | template<bool _IsMove, typename _CharT> |
e324f9cb FD |
378 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
379 | _CharT*>::__type | |
f0112db9 PC |
380 | __copy_move_a2(istreambuf_iterator<_CharT> __first, |
381 | istreambuf_iterator<_CharT> __last, _CharT* __result) | |
0002d5d2 | 382 | { |
e324f9cb FD |
383 | typedef istreambuf_iterator<_CharT> __is_iterator_type; |
384 | typedef typename __is_iterator_type::traits_type traits_type; | |
0002d5d2 | 385 | typedef typename __is_iterator_type::streambuf_type streambuf_type; |
e324f9cb | 386 | typedef typename traits_type::int_type int_type; |
0002d5d2 PC |
387 | |
388 | if (__first._M_sbuf && !__last._M_sbuf) | |
389 | { | |
390 | streambuf_type* __sb = __first._M_sbuf; | |
391 | int_type __c = __sb->sgetc(); | |
392 | while (!traits_type::eq_int_type(__c, traits_type::eof())) | |
393 | { | |
394 | const streamsize __n = __sb->egptr() - __sb->gptr(); | |
395 | if (__n > 1) | |
396 | { | |
397 | traits_type::copy(__result, __sb->gptr(), __n); | |
1139a735 | 398 | __sb->__safe_gbump(__n); |
0002d5d2 PC |
399 | __result += __n; |
400 | __c = __sb->underflow(); | |
401 | } | |
402 | else | |
403 | { | |
404 | *__result++ = traits_type::to_char_type(__c); | |
405 | __c = __sb->snextc(); | |
406 | } | |
407 | } | |
408 | } | |
409 | return __result; | |
410 | } | |
411 | ||
8ab38f6c | 412 | template<typename _CharT, typename _Size> |
4e05c918 FD |
413 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
414 | _CharT*>::__type | |
415 | __copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result, | |
416 | bool __strict __attribute__((__unused__))) | |
8ab38f6c FD |
417 | { |
418 | if (__n == 0) | |
419 | return __result; | |
420 | ||
421 | __glibcxx_requires_cond(__it._M_sbuf, | |
422 | _M_message(__gnu_debug::__msg_inc_istreambuf) | |
423 | ._M_iterator(__it)); | |
424 | _CharT* __beg = __result; | |
425 | __result += __it._M_sbuf->sgetn(__beg, __n); | |
4e05c918 | 426 | __glibcxx_requires_cond(!__strict || __result - __beg == __n, |
8ab38f6c FD |
427 | _M_message(__gnu_debug::__msg_inc_istreambuf) |
428 | ._M_iterator(__it)); | |
429 | return __result; | |
430 | } | |
8ab38f6c | 431 | |
0002d5d2 | 432 | template<typename _CharT> |
105c6331 BK |
433 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, |
434 | istreambuf_iterator<_CharT> >::__type | |
0002d5d2 | 435 | find(istreambuf_iterator<_CharT> __first, |
976e25f4 | 436 | istreambuf_iterator<_CharT> __last, const _CharT& __val) |
0002d5d2 | 437 | { |
e324f9cb | 438 | typedef istreambuf_iterator<_CharT> __is_iterator_type; |
0002d5d2 PC |
439 | typedef typename __is_iterator_type::traits_type traits_type; |
440 | typedef typename __is_iterator_type::streambuf_type streambuf_type; | |
e324f9cb | 441 | typedef typename traits_type::int_type int_type; |
4e914524 | 442 | const int_type __eof = traits_type::eof(); |
0002d5d2 PC |
443 | |
444 | if (__first._M_sbuf && !__last._M_sbuf) | |
445 | { | |
446 | const int_type __ival = traits_type::to_int_type(__val); | |
447 | streambuf_type* __sb = __first._M_sbuf; | |
448 | int_type __c = __sb->sgetc(); | |
4e914524 | 449 | while (!traits_type::eq_int_type(__c, __eof) |
0002d5d2 PC |
450 | && !traits_type::eq_int_type(__c, __ival)) |
451 | { | |
452 | streamsize __n = __sb->egptr() - __sb->gptr(); | |
453 | if (__n > 1) | |
454 | { | |
455 | const _CharT* __p = traits_type::find(__sb->gptr(), | |
456 | __n, __val); | |
457 | if (__p) | |
458 | __n = __p - __sb->gptr(); | |
1139a735 | 459 | __sb->__safe_gbump(__n); |
0002d5d2 PC |
460 | __c = __sb->sgetc(); |
461 | } | |
462 | else | |
463 | __c = __sb->snextc(); | |
464 | } | |
465 | ||
4e914524 | 466 | __first._M_c = __eof; |
0002d5d2 | 467 | } |
4e914524 | 468 | |
0002d5d2 PC |
469 | return __first; |
470 | } | |
471 | ||
e324f9cb FD |
472 | template<typename _CharT, typename _Distance> |
473 | typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, | |
474 | void>::__type | |
475 | advance(istreambuf_iterator<_CharT>& __i, _Distance __n) | |
476 | { | |
477 | if (__n == 0) | |
478 | return; | |
479 | ||
480 | __glibcxx_assert(__n > 0); | |
481 | __glibcxx_requires_cond(!__i._M_at_eof(), | |
482 | _M_message(__gnu_debug::__msg_inc_istreambuf) | |
483 | ._M_iterator(__i)); | |
484 | ||
485 | typedef istreambuf_iterator<_CharT> __is_iterator_type; | |
486 | typedef typename __is_iterator_type::traits_type traits_type; | |
487 | typedef typename __is_iterator_type::streambuf_type streambuf_type; | |
488 | typedef typename traits_type::int_type int_type; | |
489 | const int_type __eof = traits_type::eof(); | |
490 | ||
491 | streambuf_type* __sb = __i._M_sbuf; | |
492 | while (__n > 0) | |
493 | { | |
494 | streamsize __size = __sb->egptr() - __sb->gptr(); | |
495 | if (__size > __n) | |
496 | { | |
497 | __sb->__safe_gbump(__n); | |
498 | break; | |
499 | } | |
500 | ||
501 | __sb->__safe_gbump(__size); | |
502 | __n -= __size; | |
503 | if (traits_type::eq_int_type(__sb->underflow(), __eof)) | |
504 | { | |
505 | __glibcxx_requires_cond(__n == 0, | |
506 | _M_message(__gnu_debug::__msg_inc_istreambuf) | |
507 | ._M_iterator(__i)); | |
508 | break; | |
509 | } | |
510 | } | |
511 | ||
512 | __i._M_c = __eof; | |
513 | } | |
514 | ||
72ddd861 | 515 | /// @} group iterators |
8e32aa11 | 516 | |
12ffa228 BK |
517 | _GLIBCXX_END_NAMESPACE_VERSION |
518 | } // namespace | |
3cbc7af0 | 519 | |
b85381b9 | 520 | #endif |