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1 | // String based streams -*- C++ -*- |
2 | ||
3 | // Copyright (C) 1997-1999 Free Software Foundation, Inc. | |
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 | |
8 | // Free Software Foundation; either version 2, or (at your option) | |
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 | ||
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING. If not, write to the Free | |
18 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
19 | // USA. | |
20 | ||
21 | // As a special exception, you may use this file as part of a free software | |
22 | // library without restriction. Specifically, if other files instantiate | |
23 | // templates or use macros or inline functions from this file, or you compile | |
24 | // this file and link it with other files to produce an executable, this | |
25 | // file does not by itself cause the resulting executable to be covered by | |
26 | // the GNU General Public License. This exception does not however | |
27 | // invalidate any other reasons why the executable file might be covered by | |
28 | // the GNU General Public License. | |
29 | ||
30 | // | |
31 | // ISO C++ 14882: 27.7 String-based streams | |
32 | // | |
33 | ||
729e3d3f PE |
34 | /** @file std_sstream.h |
35 | * This is an internal header file, included by other library headers. | |
36 | * You should not attempt to use it directly. | |
37 | */ | |
38 | ||
725dc051 BK |
39 | #ifndef _CPP_SSTREAM |
40 | #define _CPP_SSTREAM 1 | |
41 | ||
b0a85b86 GDR |
42 | #pragma GCC system_header |
43 | ||
725dc051 BK |
44 | #include <bits/std_istream.h> |
45 | #include <bits/std_ostream.h> | |
46 | ||
d53d7f6e PE |
47 | namespace std |
48 | { | |
725dc051 BK |
49 | template<typename _CharT, typename _Traits, typename _Alloc> |
50 | class basic_stringbuf : public basic_streambuf<_CharT, _Traits> | |
51 | { | |
52 | public: | |
53 | // Types: | |
54 | typedef _CharT char_type; | |
55 | typedef _Traits traits_type; | |
30f69f71 BK |
56 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS |
57 | // 251. basic_stringbuf missing allocator_type | |
58 | typedef _Alloc allocator_type; | |
59 | #endif | |
725dc051 BK |
60 | typedef typename traits_type::int_type int_type; |
61 | typedef typename traits_type::pos_type pos_type; | |
62 | typedef typename traits_type::off_type off_type; | |
63 | ||
64 | // Non-standard Types: | |
65 | typedef basic_streambuf<char_type, traits_type> __streambuf_type; | |
66 | typedef basic_string<char_type, _Traits, _Alloc> __string_type; | |
67 | typedef typename __string_type::size_type __size_type; | |
68 | ||
69 | private: | |
70 | // Data Members: | |
71 | __string_type _M_string; | |
72 | ||
73 | public: | |
74 | // Constructors: | |
75 | explicit | |
76 | basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out) | |
77 | : __streambuf_type(), _M_string() | |
78 | { _M_stringbuf_init(__mode); } | |
79 | ||
80 | explicit | |
81 | basic_stringbuf(const __string_type& __str, | |
82 | ios_base::openmode __mode = ios_base::in | ios_base::out) | |
48fe3de0 | 83 | : __streambuf_type(), _M_string(__str.data(), __str.size()) |
725dc051 BK |
84 | { _M_stringbuf_init(__mode); } |
85 | ||
86 | // Get and set: | |
87 | __string_type | |
88 | str() const | |
89 | { | |
a85afd69 | 90 | if (_M_mode & ios_base::out) |
725dc051 | 91 | { |
48fe3de0 | 92 | // This is the deal: _M_string.size() is a value that |
c5504edb | 93 | // represents the size of the initial string that makes |
725dc051 BK |
94 | // _M_string, and may not be the correct size of the |
95 | // current stringbuf internal buffer. | |
96 | __size_type __len = _M_string.size(); | |
97 | if (_M_out_cur > _M_out_beg) | |
98 | __len = max(__size_type(_M_out_end - _M_out_beg), __len); | |
99 | return __string_type(_M_out_beg, _M_out_beg + __len); | |
100 | } | |
a85afd69 BK |
101 | else |
102 | return _M_string; | |
725dc051 BK |
103 | } |
104 | ||
105 | void | |
106 | str(const __string_type& __s) | |
107 | { | |
108 | _M_string = __s; | |
109 | _M_stringbuf_init(_M_mode); | |
110 | } | |
111 | ||
112 | protected: | |
113 | // Common initialization code for both ctors goes here. | |
114 | void | |
115 | _M_stringbuf_init(ios_base::openmode __mode) | |
116 | { | |
117 | // _M_buf_size is a convenient alias for "what the streambuf | |
118 | // thinks the allocated size of the string really is." This is | |
119 | // necessary as ostringstreams are implemented with the | |
120 | // streambufs having control of the allocation and | |
121 | // re-allocation of the internal string object, _M_string. | |
122 | _M_buf_size = _M_string.size(); | |
123 | ||
48fe3de0 | 124 | // NB: Start ostringstream buffers at 512 bytes. This is an |
725dc051 BK |
125 | // experimental value (pronounced "arbitrary" in some of the |
126 | // hipper english-speaking countries), and can be changed to | |
127 | // suite particular needs. | |
128 | _M_buf_size_opt = 512; | |
129 | _M_mode = __mode; | |
130 | if (_M_mode & ios_base::ate) | |
131 | _M_really_sync(0, _M_buf_size); | |
132 | else | |
a85afd69 | 133 | _M_really_sync(0, 0); |
725dc051 BK |
134 | } |
135 | ||
136 | // Overridden virtual functions: | |
137 | virtual int_type | |
138 | underflow() | |
139 | { | |
140 | if (_M_in_cur && _M_in_cur < _M_in_end) | |
141 | return traits_type::to_int_type(*gptr()); | |
142 | else | |
143 | return traits_type::eof(); | |
144 | } | |
145 | ||
146 | virtual int_type | |
147 | pbackfail(int_type __c = traits_type::eof()); | |
148 | ||
149 | virtual int_type | |
150 | overflow(int_type __c = traits_type::eof()); | |
151 | ||
152 | virtual __streambuf_type* | |
153 | setbuf(char_type* __s, streamsize __n) | |
154 | { | |
990101f9 | 155 | if (__s && __n) |
725dc051 BK |
156 | { |
157 | _M_string = __string_type(__s, __n); | |
158 | _M_really_sync(0, 0); | |
159 | } | |
160 | return this; | |
161 | } | |
162 | ||
163 | virtual pos_type | |
164 | seekoff(off_type __off, ios_base::seekdir __way, | |
165 | ios_base::openmode __mode = ios_base::in | ios_base::out); | |
166 | ||
167 | virtual pos_type | |
168 | seekpos(pos_type __sp, | |
169 | ios_base::openmode __mode = ios_base::in | ios_base::out); | |
170 | ||
171 | // Internal function for correctly updating the internal buffer | |
172 | // for a particular _M_string, due to initialization or | |
173 | // re-sizing of an existing _M_string. | |
174 | // Assumes: contents of _M_string and internal buffer match exactly. | |
175 | // __i == _M_in_cur - _M_in_beg | |
176 | // __o == _M_out_cur - _M_out_beg | |
177 | virtual int | |
178 | _M_really_sync(__size_type __i, __size_type __o) | |
179 | { | |
180 | char_type* __base = const_cast<char_type*>(_M_string.data()); | |
181 | bool __testin = _M_mode & ios_base::in; | |
182 | bool __testout = _M_mode & ios_base::out; | |
183 | __size_type __len = _M_string.size(); | |
184 | ||
185 | _M_buf = __base; | |
186 | if (__testin) | |
187 | this->setg(__base, __base + __i, __base + __len); | |
188 | if (__testout) | |
189 | { | |
190 | this->setp(__base, __base + __len); | |
191 | _M_out_cur += __o; | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | }; | |
196 | ||
197 | ||
198 | // 27.7.2 Template class basic_istringstream | |
199 | template<typename _CharT, typename _Traits, typename _Alloc> | |
200 | class basic_istringstream : public basic_istream<_CharT, _Traits> | |
201 | { | |
202 | public: | |
203 | // Types: | |
204 | typedef _CharT char_type; | |
205 | typedef _Traits traits_type; | |
30f69f71 BK |
206 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS |
207 | // 251. basic_stringbuf missing allocator_type | |
208 | typedef _Alloc allocator_type; | |
209 | #endif | |
725dc051 BK |
210 | typedef typename traits_type::int_type int_type; |
211 | typedef typename traits_type::pos_type pos_type; | |
212 | typedef typename traits_type::off_type off_type; | |
213 | ||
214 | // Non-standard types: | |
215 | typedef basic_string<_CharT, _Traits, _Alloc> __string_type; | |
216 | typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type; | |
217 | typedef basic_istream<char_type, traits_type> __istream_type; | |
218 | ||
d422980b BK |
219 | private: |
220 | __stringbuf_type _M_stringbuf; | |
221 | ||
222 | public: | |
725dc051 BK |
223 | // Constructors: |
224 | explicit | |
225 | basic_istringstream(ios_base::openmode __mode = ios_base::in) | |
d422980b BK |
226 | : __istream_type(NULL), _M_stringbuf(__mode | ios_base::in) |
227 | { this->init(&_M_stringbuf); } | |
725dc051 BK |
228 | |
229 | explicit | |
230 | basic_istringstream(const __string_type& __str, | |
231 | ios_base::openmode __mode = ios_base::in) | |
d422980b BK |
232 | : __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in) |
233 | { this->init(&_M_stringbuf); } | |
725dc051 BK |
234 | |
235 | ~basic_istringstream() | |
d422980b | 236 | { } |
725dc051 BK |
237 | |
238 | // Members: | |
239 | __stringbuf_type* | |
240 | rdbuf() const | |
d422980b | 241 | { return const_cast<__stringbuf_type*>(&_M_stringbuf); } |
725dc051 BK |
242 | |
243 | __string_type | |
244 | str() const | |
d422980b | 245 | { return _M_stringbuf.str(); } |
725dc051 BK |
246 | |
247 | void | |
248 | str(const __string_type& __s) | |
d422980b | 249 | { _M_stringbuf.str(__s); } |
725dc051 BK |
250 | }; |
251 | ||
252 | ||
253 | // 27.7.3 Template class basic_ostringstream | |
254 | template <typename _CharT, typename _Traits, typename _Alloc> | |
255 | class basic_ostringstream : public basic_ostream<_CharT, _Traits> | |
256 | { | |
257 | public: | |
258 | // Types: | |
259 | typedef _CharT char_type; | |
260 | typedef _Traits traits_type; | |
30f69f71 BK |
261 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS |
262 | // 251. basic_stringbuf missing allocator_type | |
263 | typedef _Alloc allocator_type; | |
264 | #endif | |
725dc051 BK |
265 | typedef typename traits_type::int_type int_type; |
266 | typedef typename traits_type::pos_type pos_type; | |
267 | typedef typename traits_type::off_type off_type; | |
268 | ||
269 | // Non-standard types: | |
270 | typedef basic_string<_CharT, _Traits, _Alloc> __string_type; | |
271 | typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type; | |
272 | typedef basic_ostream<char_type, traits_type> __ostream_type; | |
273 | ||
d422980b BK |
274 | private: |
275 | __stringbuf_type _M_stringbuf; | |
276 | ||
277 | public: | |
278 | // Constructors/destructor: | |
725dc051 BK |
279 | explicit |
280 | basic_ostringstream(ios_base::openmode __mode = ios_base::out) | |
d422980b BK |
281 | : __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out) |
282 | { this->init(&_M_stringbuf); } | |
725dc051 BK |
283 | |
284 | explicit | |
bfa73213 | 285 | basic_ostringstream(const __string_type& __str, |
725dc051 | 286 | ios_base::openmode __mode = ios_base::out) |
d422980b BK |
287 | : __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out) |
288 | { this->init(&_M_stringbuf); } | |
725dc051 BK |
289 | |
290 | ~basic_ostringstream() | |
d422980b | 291 | { } |
725dc051 BK |
292 | |
293 | // Members: | |
294 | __stringbuf_type* | |
295 | rdbuf() const | |
d422980b | 296 | { return const_cast<__stringbuf_type*>(&_M_stringbuf); } |
725dc051 BK |
297 | |
298 | __string_type | |
299 | str() const | |
d422980b | 300 | { return _M_stringbuf.str(); } |
725dc051 BK |
301 | |
302 | void | |
303 | str(const __string_type& __s) | |
d422980b | 304 | { _M_stringbuf.str(__s); } |
725dc051 BK |
305 | }; |
306 | ||
307 | ||
308 | // 27.7.4 Template class basic_stringstream | |
309 | template <typename _CharT, typename _Traits, typename _Alloc> | |
310 | class basic_stringstream : public basic_iostream<_CharT, _Traits> | |
311 | { | |
312 | public: | |
313 | // Types: | |
314 | typedef _CharT char_type; | |
315 | typedef _Traits traits_type; | |
30f69f71 BK |
316 | #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS |
317 | // 251. basic_stringbuf missing allocator_type | |
318 | typedef _Alloc allocator_type; | |
319 | #endif | |
725dc051 BK |
320 | typedef typename traits_type::int_type int_type; |
321 | typedef typename traits_type::pos_type pos_type; | |
322 | typedef typename traits_type::off_type off_type; | |
323 | ||
324 | // Non-standard Types: | |
325 | typedef basic_string<_CharT, _Traits, _Alloc> __string_type; | |
326 | typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type; | |
327 | typedef basic_iostream<char_type, traits_type> __iostream_type; | |
d422980b BK |
328 | |
329 | private: | |
330 | __stringbuf_type _M_stringbuf; | |
331 | ||
332 | public: | |
725dc051 BK |
333 | // Constructors/destructors |
334 | explicit | |
d422980b BK |
335 | basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in) |
336 | : __iostream_type(NULL), _M_stringbuf(__m) | |
337 | { this->init(&_M_stringbuf); } | |
725dc051 BK |
338 | |
339 | explicit | |
340 | basic_stringstream(const __string_type& __str, | |
d422980b BK |
341 | ios_base::openmode __m = ios_base::out | ios_base::in) |
342 | : __iostream_type(NULL), _M_stringbuf(__str, __m) | |
343 | { this->init(&_M_stringbuf); } | |
725dc051 BK |
344 | |
345 | ~basic_stringstream() | |
d422980b | 346 | { } |
725dc051 BK |
347 | |
348 | // Members: | |
349 | __stringbuf_type* | |
350 | rdbuf() const | |
d422980b | 351 | { return const_cast<__stringbuf_type*>(&_M_stringbuf); } |
725dc051 BK |
352 | |
353 | __string_type | |
354 | str() const | |
d422980b | 355 | { return _M_stringbuf.str(); } |
725dc051 BK |
356 | |
357 | void | |
358 | str(const __string_type& __s) | |
d422980b | 359 | { _M_stringbuf.str(__s); } |
725dc051 | 360 | }; |
725dc051 BK |
361 | } // namespace std |
362 | ||
363 | ||
364 | ||
365 | #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT | |
366 | # define export | |
367 | #ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS | |
368 | # include <bits/sstream.tcc> | |
369 | #endif | |
370 | #endif | |
371 | ||
d422980b | 372 | #endif // _CPP_SSTREAM |