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42526146 PE |
1 | // strstream definitions -*- C++ -*- |
2 | ||
1139a735 PC |
3 | // Copyright (C) 2001, 2002, 2003, 2005, 2009, 2010, 2011 |
4 | // Free Software Foundation | |
42526146 | 5 | // |
38cca750 BK |
6 | // This file is part of the GNU ISO C++ Library. This library is free |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
748086b7 | 9 | // Free Software Foundation; either version 3, or (at your option) |
42526146 | 10 | // any later version. |
38cca750 BK |
11 | |
12 | // This library is distributed in the hope that it will be useful, | |
42526146 PE |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
38cca750 | 16 | |
748086b7 JJ |
17 | // Under Section 7 of GPL version 3, you are granted additional |
18 | // permissions described in the GCC Runtime Library Exception, version | |
19 | // 3.1, as published by the Free Software Foundation. | |
42526146 | 20 | |
748086b7 JJ |
21 | // You should have received a copy of the GNU General Public License and |
22 | // a copy of the GCC Runtime Library Exception along with this program; | |
23 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | // <http://www.gnu.org/licenses/>. | |
42526146 | 25 | |
b2dad0e3 BK |
26 | /* |
27 | * Copyright (c) 1998 | |
28 | * Silicon Graphics Computer Systems, Inc. | |
29 | * | |
30 | * Permission to use, copy, modify, distribute and sell this software | |
31 | * and its documentation for any purpose is hereby granted without fee, | |
32 | * provided that the above copyright notice appear in all copies and | |
33 | * that both that copyright notice and this permission notice appear | |
34 | * in supporting documentation. Silicon Graphics makes no | |
35 | * representations about the suitability of this software for any | |
36 | * purpose. It is provided "as is" without express or implied warranty. | |
37 | */ | |
38 | ||
39 | // Implementation of the classes in header <strstream>. | |
40 | // WARNING: The classes defined in <strstream> are DEPRECATED. This | |
41 | // header is defined in section D.7.1 of the C++ standard, and it | |
42 | // MAY BE REMOVED in a future standard revision. You should use the | |
43 | // header <sstream> instead. | |
44 | ||
9a56333e | 45 | #include <strstream> |
5feb272b | 46 | #include <algorithm> |
b2dad0e3 BK |
47 | #include <new> |
48 | #include <stdlib.h> | |
49 | #include <string.h> | |
50 | #include <limits.h> | |
51 | ||
12ffa228 BK |
52 | namespace std _GLIBCXX_VISIBILITY(default) |
53 | { | |
54 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 55 | |
9a56333e BK |
56 | strstreambuf::strstreambuf(streamsize initial_capacity) |
57 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(true), | |
58 | _M_frozen(false), _M_constant(false) | |
59 | { | |
4977bab6 | 60 | streamsize n = std::max(initial_capacity, streamsize(16)); |
49bc23b7 BK |
61 | |
62 | char* buf = _M_alloc(n); | |
63 | if (buf) | |
9a56333e | 64 | { |
49bc23b7 BK |
65 | setp(buf, buf + n); |
66 | setg(buf, buf, buf); | |
9a56333e BK |
67 | } |
68 | } | |
69 | ||
70 | strstreambuf::strstreambuf(void* (*alloc_f)(size_t), void (*free_f)(void*)) | |
71 | : _Base(), _M_alloc_fun(alloc_f), _M_free_fun(free_f), _M_dynamic(true), | |
72 | _M_frozen(false), _M_constant(false) | |
73 | { | |
49bc23b7 BK |
74 | streamsize n = 16; |
75 | ||
76 | char* buf = _M_alloc(n); | |
77 | if (buf) | |
9a56333e | 78 | { |
49bc23b7 BK |
79 | setp(buf, buf + n); |
80 | setg(buf, buf, buf); | |
9a56333e BK |
81 | } |
82 | } | |
83 | ||
50a681c4 | 84 | strstreambuf::strstreambuf(char* get, streamsize n, char* put) throw () |
9a56333e BK |
85 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), |
86 | _M_frozen(false), _M_constant(false) | |
87 | { _M_setup(get, put, n); } | |
88 | ||
50a681c4 | 89 | strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put) throw () |
9a56333e | 90 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), |
497e42fd | 91 | _M_frozen(false), _M_constant(false) |
9a56333e BK |
92 | { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); } |
93 | ||
94 | strstreambuf::strstreambuf(unsigned char* get, streamsize n, | |
50a681c4 | 95 | unsigned char* put) throw () |
9a56333e BK |
96 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), |
97 | _M_frozen(false), _M_constant(false) | |
98 | { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); } | |
99 | ||
50a681c4 | 100 | strstreambuf::strstreambuf(const char* get, streamsize n) throw () |
9a56333e BK |
101 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), |
102 | _M_frozen(false), _M_constant(true) | |
103 | { _M_setup(const_cast<char*>(get), 0, n); } | |
104 | ||
50a681c4 | 105 | strstreambuf::strstreambuf(const signed char* get, streamsize n) throw () |
9a56333e BK |
106 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), |
107 | _M_frozen(false), _M_constant(true) | |
108 | { _M_setup(reinterpret_cast<char*>(const_cast<signed char*>(get)), 0, n); } | |
109 | ||
50a681c4 | 110 | strstreambuf::strstreambuf(const unsigned char* get, streamsize n) throw () |
9a56333e BK |
111 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), |
112 | _M_frozen(false), _M_constant(true) | |
113 | { _M_setup(reinterpret_cast<char*>(const_cast<unsigned char*>(get)), 0, n); } | |
114 | ||
115 | strstreambuf::~strstreambuf() | |
116 | { | |
117 | if (_M_dynamic && !_M_frozen) | |
49bc23b7 | 118 | _M_free(eback()); |
9a56333e BK |
119 | } |
120 | ||
121 | void | |
50a681c4 | 122 | strstreambuf::freeze(bool frozenflag) throw () |
9a56333e BK |
123 | { |
124 | if (_M_dynamic) | |
125 | _M_frozen = frozenflag; | |
126 | } | |
127 | ||
128 | char* | |
50a681c4 | 129 | strstreambuf::str() throw () |
9a56333e BK |
130 | { |
131 | freeze(true); | |
132 | return eback(); | |
133 | } | |
134 | ||
135 | int | |
50a681c4 | 136 | strstreambuf::pcount() const throw () |
9a56333e BK |
137 | { return pptr() ? pptr() - pbase() : 0; } |
138 | ||
139 | strstreambuf::int_type | |
140 | strstreambuf::overflow(int_type c) | |
141 | { | |
142 | if (c == traits_type::eof()) | |
143 | return traits_type::not_eof(c); | |
497e42fd | 144 | |
9a56333e BK |
145 | // Try to expand the buffer. |
146 | if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant) | |
147 | { | |
148 | ptrdiff_t old_size = epptr() - pbase(); | |
dd6eaaed | 149 | ptrdiff_t new_size = std::max(ptrdiff_t(2 * old_size), ptrdiff_t(1)); |
497e42fd | 150 | |
9a56333e BK |
151 | char* buf = _M_alloc(new_size); |
152 | if (buf) | |
153 | { | |
154 | memcpy(buf, pbase(), old_size); | |
155 | char* old_buffer = pbase(); | |
156 | bool reposition_get = false; | |
157 | ptrdiff_t old_get_offset; | |
158 | if (gptr() != 0) | |
159 | { | |
160 | reposition_get = true; | |
161 | old_get_offset = gptr() - eback(); | |
162 | } | |
497e42fd | 163 | |
9a56333e | 164 | setp(buf, buf + new_size); |
1139a735 | 165 | __safe_pbump(old_size); |
9a56333e BK |
166 | |
167 | if (reposition_get) | |
168 | setg(buf, buf + old_get_offset, buf + | |
4977bab6 | 169 | std::max(old_get_offset, old_size)); |
9a56333e BK |
170 | |
171 | _M_free(old_buffer); | |
172 | } | |
173 | } | |
497e42fd | 174 | |
9a56333e BK |
175 | if (pptr() != epptr()) |
176 | { | |
177 | *pptr() = c; | |
178 | pbump(1); | |
179 | return c; | |
180 | } | |
181 | else | |
182 | return traits_type::eof(); | |
183 | } | |
184 | ||
185 | strstreambuf::int_type | |
186 | strstreambuf::pbackfail(int_type c) | |
187 | { | |
188 | if (gptr() != eback()) | |
189 | { | |
497e42fd BK |
190 | if (c == _Traits::eof()) |
191 | { | |
192 | gbump(-1); | |
193 | return _Traits::not_eof(c); | |
194 | } | |
a62e7311 | 195 | else if (c == _Traits::to_int_type(gptr()[-1])) |
497e42fd BK |
196 | { // KLUDGE |
197 | gbump(-1); | |
198 | return c; | |
199 | } | |
200 | else if (!_M_constant) | |
201 | { | |
202 | gbump(-1); | |
203 | *gptr() = c; | |
204 | return c; | |
205 | } | |
b2dad0e3 | 206 | } |
eafa1afa | 207 | return _Traits::eof(); |
9a56333e | 208 | } |
eafa1afa | 209 | |
9a56333e BK |
210 | strstreambuf::int_type |
211 | strstreambuf::underflow() | |
212 | { | |
213 | if (gptr() == egptr() && pptr() && pptr() > egptr()) | |
214 | setg(eback(), gptr(), pptr()); | |
eafa1afa | 215 | |
9a56333e BK |
216 | if (gptr() != egptr()) |
217 | return (unsigned char) *gptr(); | |
218 | else | |
219 | return _Traits::eof(); | |
220 | } | |
221 | ||
222 | basic_streambuf<char, char_traits<char> >* | |
223 | strstreambuf::setbuf(char*, streamsize) | |
224 | { return this; } | |
225 | ||
226 | strstreambuf::pos_type | |
227 | strstreambuf::seekoff(off_type off, ios_base::seekdir dir, | |
228 | ios_base::openmode mode) | |
229 | { | |
230 | bool do_get = false; | |
231 | bool do_put = false; | |
232 | ||
233 | if ((mode & (ios_base::in | ios_base::out)) | |
234 | == (ios_base::in | ios_base::out) && | |
235 | (dir == ios_base::beg || dir == ios_base::end)) | |
46bbeb65 | 236 | do_get = do_put = true; |
9a56333e BK |
237 | else if (mode & ios_base::in) |
238 | do_get = true; | |
239 | else if (mode & ios_base::out) | |
240 | do_put = true; | |
241 | ||
242 | // !gptr() is here because, according to D.7.1 paragraph 4, the seekable | |
243 | // area is undefined if there is no get area. | |
244 | if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr()) | |
245 | return pos_type(off_type(-1)); | |
eafa1afa | 246 | |
9a56333e BK |
247 | char* seeklow = eback(); |
248 | char* seekhigh = epptr() ? epptr() : egptr(); | |
249 | ||
250 | off_type newoff; | |
251 | switch (dir) | |
252 | { | |
253 | case ios_base::beg: | |
254 | newoff = 0; | |
255 | break; | |
256 | case ios_base::end: | |
257 | newoff = seekhigh - seeklow; | |
258 | break; | |
259 | case ios_base::cur: | |
260 | newoff = do_put ? pptr() - seeklow : gptr() - seeklow; | |
261 | break; | |
262 | default: | |
263 | return pos_type(off_type(-1)); | |
264 | } | |
265 | ||
266 | off += newoff; | |
267 | if (off < 0 || off > seekhigh - seeklow) | |
268 | return pos_type(off_type(-1)); | |
eafa1afa | 269 | |
9a56333e BK |
270 | if (do_put) |
271 | { | |
272 | if (seeklow + off < pbase()) | |
273 | { | |
274 | setp(seeklow, epptr()); | |
1139a735 | 275 | __safe_pbump(off); |
9a56333e BK |
276 | } |
277 | else | |
278 | { | |
279 | setp(pbase(), epptr()); | |
1139a735 | 280 | __safe_pbump(off - (pbase() - seeklow)); |
9a56333e BK |
281 | } |
282 | } | |
283 | if (do_get) | |
284 | { | |
285 | if (off <= egptr() - seeklow) | |
286 | setg(seeklow, seeklow + off, egptr()); | |
287 | else if (off <= pptr() - seeklow) | |
288 | setg(seeklow, seeklow + off, pptr()); | |
289 | else | |
290 | setg(seeklow, seeklow + off, epptr()); | |
291 | } | |
292 | return pos_type(newoff); | |
293 | } | |
294 | ||
295 | strstreambuf::pos_type | |
296 | strstreambuf::seekpos(pos_type pos, ios_base::openmode mode) | |
297 | { return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode); } | |
298 | ||
299 | char* | |
300 | strstreambuf::_M_alloc(size_t n) | |
301 | { | |
302 | if (_M_alloc_fun) | |
303 | return static_cast<char*>(_M_alloc_fun(n)); | |
eafa1afa | 304 | else |
9a56333e BK |
305 | return new char[n]; |
306 | } | |
307 | ||
308 | void | |
309 | strstreambuf::_M_free(char* p) | |
310 | { | |
311 | if (p) | |
2a67bec2 ILT |
312 | { |
313 | if (_M_free_fun) | |
314 | _M_free_fun(p); | |
315 | else | |
316 | delete[] p; | |
317 | } | |
9a56333e BK |
318 | } |
319 | ||
320 | void | |
50a681c4 | 321 | strstreambuf::_M_setup(char* get, char* put, streamsize n) throw () |
9a56333e BK |
322 | { |
323 | if (get) | |
324 | { | |
325 | size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX); | |
497e42fd | 326 | |
9a56333e BK |
327 | if (put) |
328 | { | |
329 | setg(get, get, put); | |
330 | setp(put, put + N); | |
331 | } | |
332 | else | |
333 | setg(get, get, get + N); | |
334 | } | |
335 | } | |
336 | ||
337 | istrstream::istrstream(char* s) | |
338 | : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0) | |
339 | { basic_ios<char>::init(&_M_buf); } | |
340 | ||
341 | istrstream::istrstream(const char* s) | |
342 | : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0) | |
343 | { basic_ios<char>::init(&_M_buf); } | |
344 | ||
345 | istrstream::istrstream(char* s, streamsize n) | |
346 | : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n) | |
347 | { basic_ios<char>::init(&_M_buf); } | |
348 | ||
349 | istrstream::istrstream(const char* s, streamsize n) | |
350 | : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n) | |
351 | { basic_ios<char>::init(&_M_buf); } | |
352 | ||
353 | istrstream::~istrstream() { } | |
354 | ||
355 | strstreambuf* | |
50a681c4 | 356 | istrstream::rdbuf() const throw () |
9a56333e BK |
357 | { return const_cast<strstreambuf*>(&_M_buf); } |
358 | ||
359 | char* | |
50a681c4 | 360 | istrstream::str() throw () |
9a56333e BK |
361 | { return _M_buf.str(); } |
362 | ||
363 | ostrstream::ostrstream() | |
364 | : basic_ios<char>(), basic_ostream<char>(0), _M_buf() | |
365 | { basic_ios<char>::init(&_M_buf); } | |
366 | ||
367 | ostrstream::ostrstream(char* s, int n, ios_base::openmode mode) | |
368 | : basic_ios<char>(), basic_ostream<char>(0), | |
369 | _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) | |
370 | { basic_ios<char>::init(&_M_buf); } | |
371 | ||
372 | ostrstream::~ostrstream() {} | |
373 | ||
374 | strstreambuf* | |
50a681c4 | 375 | ostrstream::rdbuf() const throw () |
9a56333e BK |
376 | { return const_cast<strstreambuf*>(&_M_buf); } |
377 | ||
378 | void | |
50a681c4 | 379 | ostrstream::freeze(bool freezeflag) throw () |
9a56333e BK |
380 | { _M_buf.freeze(freezeflag); } |
381 | ||
382 | char* | |
50a681c4 | 383 | ostrstream::str() throw () |
9a56333e BK |
384 | { return _M_buf.str(); } |
385 | ||
386 | int | |
50a681c4 | 387 | ostrstream::pcount() const throw () |
9a56333e BK |
388 | { return _M_buf.pcount(); } |
389 | ||
390 | strstream::strstream() | |
391 | : basic_ios<char>(), basic_iostream<char>(0), _M_buf() | |
392 | { basic_ios<char>::init(&_M_buf); } | |
393 | ||
394 | strstream::strstream(char* s, int n, ios_base::openmode mode) | |
395 | : basic_ios<char>(), basic_iostream<char>(0), | |
396 | _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) | |
397 | { basic_ios<char>::init(&_M_buf); } | |
398 | ||
399 | strstream::~strstream() { } | |
400 | ||
401 | strstreambuf* | |
50a681c4 | 402 | strstream::rdbuf() const throw () |
9a56333e BK |
403 | { return const_cast<strstreambuf*>(&_M_buf); } |
404 | ||
405 | void | |
50a681c4 | 406 | strstream::freeze(bool freezeflag) throw () |
9a56333e BK |
407 | { _M_buf.freeze(freezeflag); } |
408 | ||
409 | int | |
50a681c4 | 410 | strstream::pcount() const throw () |
9a56333e BK |
411 | { return _M_buf.pcount(); } |
412 | ||
413 | char* | |
50a681c4 | 414 | strstream::str() throw () |
9a56333e | 415 | { return _M_buf.str(); } |
3cbc7af0 | 416 | |
12ffa228 BK |
417 | _GLIBCXX_END_NAMESPACE_VERSION |
418 | } // namespace |