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42526146 PE |
1 | // strstream definitions -*- C++ -*- |
2 | ||
3cbc7af0 | 3 | // Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation |
42526146 | 4 | // |
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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) | |
42526146 | 9 | // any later version. |
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10 | |
11 | // This library is distributed in the hope that it will be useful, | |
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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. | |
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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 | |
83f51799 | 18 | // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
38cca750 | 19 | // USA. |
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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 | ||
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30 | /* |
31 | * Copyright (c) 1998 | |
32 | * Silicon Graphics Computer Systems, Inc. | |
33 | * | |
34 | * Permission to use, copy, modify, distribute and sell this software | |
35 | * and its documentation for any purpose is hereby granted without fee, | |
36 | * provided that the above copyright notice appear in all copies and | |
37 | * that both that copyright notice and this permission notice appear | |
38 | * in supporting documentation. Silicon Graphics makes no | |
39 | * representations about the suitability of this software for any | |
40 | * purpose. It is provided "as is" without express or implied warranty. | |
41 | */ | |
42 | ||
43 | // Implementation of the classes in header <strstream>. | |
44 | // WARNING: The classes defined in <strstream> are DEPRECATED. This | |
45 | // header is defined in section D.7.1 of the C++ standard, and it | |
46 | // MAY BE REMOVED in a future standard revision. You should use the | |
47 | // header <sstream> instead. | |
48 | ||
9a56333e | 49 | #include <strstream> |
5feb272b | 50 | #include <algorithm> |
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51 | #include <new> |
52 | #include <stdlib.h> | |
53 | #include <string.h> | |
54 | #include <limits.h> | |
55 | ||
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56 | _GLIBCXX_BEGIN_NAMESPACE(std) |
57 | ||
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58 | strstreambuf::strstreambuf(streamsize initial_capacity) |
59 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(true), | |
60 | _M_frozen(false), _M_constant(false) | |
61 | { | |
4977bab6 | 62 | streamsize n = std::max(initial_capacity, streamsize(16)); |
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63 | |
64 | char* buf = _M_alloc(n); | |
65 | if (buf) | |
9a56333e | 66 | { |
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67 | setp(buf, buf + n); |
68 | setg(buf, buf, buf); | |
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69 | } |
70 | } | |
71 | ||
72 | strstreambuf::strstreambuf(void* (*alloc_f)(size_t), void (*free_f)(void*)) | |
73 | : _Base(), _M_alloc_fun(alloc_f), _M_free_fun(free_f), _M_dynamic(true), | |
74 | _M_frozen(false), _M_constant(false) | |
75 | { | |
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76 | streamsize n = 16; |
77 | ||
78 | char* buf = _M_alloc(n); | |
79 | if (buf) | |
9a56333e | 80 | { |
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81 | setp(buf, buf + n); |
82 | setg(buf, buf, buf); | |
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83 | } |
84 | } | |
85 | ||
86 | strstreambuf::strstreambuf(char* get, streamsize n, char* put) | |
87 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), | |
88 | _M_frozen(false), _M_constant(false) | |
89 | { _M_setup(get, put, n); } | |
90 | ||
91 | strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put) | |
92 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), | |
497e42fd | 93 | _M_frozen(false), _M_constant(false) |
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94 | { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); } |
95 | ||
96 | strstreambuf::strstreambuf(unsigned char* get, streamsize n, | |
97 | unsigned char* put) | |
98 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), | |
99 | _M_frozen(false), _M_constant(false) | |
100 | { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); } | |
101 | ||
102 | strstreambuf::strstreambuf(const char* get, streamsize n) | |
103 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), | |
104 | _M_frozen(false), _M_constant(true) | |
105 | { _M_setup(const_cast<char*>(get), 0, n); } | |
106 | ||
107 | strstreambuf::strstreambuf(const signed char* get, streamsize n) | |
108 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), | |
109 | _M_frozen(false), _M_constant(true) | |
110 | { _M_setup(reinterpret_cast<char*>(const_cast<signed char*>(get)), 0, n); } | |
111 | ||
112 | strstreambuf::strstreambuf(const unsigned char* get, streamsize n) | |
113 | : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), | |
114 | _M_frozen(false), _M_constant(true) | |
115 | { _M_setup(reinterpret_cast<char*>(const_cast<unsigned char*>(get)), 0, n); } | |
116 | ||
117 | strstreambuf::~strstreambuf() | |
118 | { | |
119 | if (_M_dynamic && !_M_frozen) | |
49bc23b7 | 120 | _M_free(eback()); |
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121 | } |
122 | ||
123 | void | |
124 | strstreambuf::freeze(bool frozenflag) | |
125 | { | |
126 | if (_M_dynamic) | |
127 | _M_frozen = frozenflag; | |
128 | } | |
129 | ||
130 | char* | |
131 | strstreambuf::str() | |
132 | { | |
133 | freeze(true); | |
134 | return eback(); | |
135 | } | |
136 | ||
137 | int | |
138 | strstreambuf::pcount() const | |
139 | { return pptr() ? pptr() - pbase() : 0; } | |
140 | ||
141 | strstreambuf::int_type | |
142 | strstreambuf::overflow(int_type c) | |
143 | { | |
144 | if (c == traits_type::eof()) | |
145 | return traits_type::not_eof(c); | |
497e42fd | 146 | |
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147 | // Try to expand the buffer. |
148 | if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant) | |
149 | { | |
150 | ptrdiff_t old_size = epptr() - pbase(); | |
dd6eaaed | 151 | ptrdiff_t new_size = std::max(ptrdiff_t(2 * old_size), ptrdiff_t(1)); |
497e42fd | 152 | |
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153 | char* buf = _M_alloc(new_size); |
154 | if (buf) | |
155 | { | |
156 | memcpy(buf, pbase(), old_size); | |
157 | char* old_buffer = pbase(); | |
158 | bool reposition_get = false; | |
159 | ptrdiff_t old_get_offset; | |
160 | if (gptr() != 0) | |
161 | { | |
162 | reposition_get = true; | |
163 | old_get_offset = gptr() - eback(); | |
164 | } | |
497e42fd | 165 | |
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166 | setp(buf, buf + new_size); |
167 | pbump(old_size); | |
168 | ||
169 | if (reposition_get) | |
170 | setg(buf, buf + old_get_offset, buf + | |
4977bab6 | 171 | std::max(old_get_offset, old_size)); |
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172 | |
173 | _M_free(old_buffer); | |
174 | } | |
175 | } | |
497e42fd | 176 | |
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177 | if (pptr() != epptr()) |
178 | { | |
179 | *pptr() = c; | |
180 | pbump(1); | |
181 | return c; | |
182 | } | |
183 | else | |
184 | return traits_type::eof(); | |
185 | } | |
186 | ||
187 | strstreambuf::int_type | |
188 | strstreambuf::pbackfail(int_type c) | |
189 | { | |
190 | if (gptr() != eback()) | |
191 | { | |
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192 | if (c == _Traits::eof()) |
193 | { | |
194 | gbump(-1); | |
195 | return _Traits::not_eof(c); | |
196 | } | |
a62e7311 | 197 | else if (c == _Traits::to_int_type(gptr()[-1])) |
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198 | { // KLUDGE |
199 | gbump(-1); | |
200 | return c; | |
201 | } | |
202 | else if (!_M_constant) | |
203 | { | |
204 | gbump(-1); | |
205 | *gptr() = c; | |
206 | return c; | |
207 | } | |
b2dad0e3 | 208 | } |
eafa1afa | 209 | return _Traits::eof(); |
9a56333e | 210 | } |
eafa1afa | 211 | |
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212 | strstreambuf::int_type |
213 | strstreambuf::underflow() | |
214 | { | |
215 | if (gptr() == egptr() && pptr() && pptr() > egptr()) | |
216 | setg(eback(), gptr(), pptr()); | |
eafa1afa | 217 | |
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218 | if (gptr() != egptr()) |
219 | return (unsigned char) *gptr(); | |
220 | else | |
221 | return _Traits::eof(); | |
222 | } | |
223 | ||
224 | basic_streambuf<char, char_traits<char> >* | |
225 | strstreambuf::setbuf(char*, streamsize) | |
226 | { return this; } | |
227 | ||
228 | strstreambuf::pos_type | |
229 | strstreambuf::seekoff(off_type off, ios_base::seekdir dir, | |
230 | ios_base::openmode mode) | |
231 | { | |
232 | bool do_get = false; | |
233 | bool do_put = false; | |
234 | ||
235 | if ((mode & (ios_base::in | ios_base::out)) | |
236 | == (ios_base::in | ios_base::out) && | |
237 | (dir == ios_base::beg || dir == ios_base::end)) | |
238 | do_get = do_put = true; | |
239 | else if (mode & ios_base::in) | |
240 | do_get = true; | |
241 | else if (mode & ios_base::out) | |
242 | do_put = true; | |
243 | ||
244 | // !gptr() is here because, according to D.7.1 paragraph 4, the seekable | |
245 | // area is undefined if there is no get area. | |
246 | if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr()) | |
247 | return pos_type(off_type(-1)); | |
eafa1afa | 248 | |
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249 | char* seeklow = eback(); |
250 | char* seekhigh = epptr() ? epptr() : egptr(); | |
251 | ||
252 | off_type newoff; | |
253 | switch (dir) | |
254 | { | |
255 | case ios_base::beg: | |
256 | newoff = 0; | |
257 | break; | |
258 | case ios_base::end: | |
259 | newoff = seekhigh - seeklow; | |
260 | break; | |
261 | case ios_base::cur: | |
262 | newoff = do_put ? pptr() - seeklow : gptr() - seeklow; | |
263 | break; | |
264 | default: | |
265 | return pos_type(off_type(-1)); | |
266 | } | |
267 | ||
268 | off += newoff; | |
269 | if (off < 0 || off > seekhigh - seeklow) | |
270 | return pos_type(off_type(-1)); | |
eafa1afa | 271 | |
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272 | if (do_put) |
273 | { | |
274 | if (seeklow + off < pbase()) | |
275 | { | |
276 | setp(seeklow, epptr()); | |
277 | pbump(off); | |
278 | } | |
279 | else | |
280 | { | |
281 | setp(pbase(), epptr()); | |
282 | pbump(off - (pbase() - seeklow)); | |
283 | } | |
284 | } | |
285 | if (do_get) | |
286 | { | |
287 | if (off <= egptr() - seeklow) | |
288 | setg(seeklow, seeklow + off, egptr()); | |
289 | else if (off <= pptr() - seeklow) | |
290 | setg(seeklow, seeklow + off, pptr()); | |
291 | else | |
292 | setg(seeklow, seeklow + off, epptr()); | |
293 | } | |
294 | return pos_type(newoff); | |
295 | } | |
296 | ||
297 | strstreambuf::pos_type | |
298 | strstreambuf::seekpos(pos_type pos, ios_base::openmode mode) | |
299 | { return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode); } | |
300 | ||
301 | char* | |
302 | strstreambuf::_M_alloc(size_t n) | |
303 | { | |
304 | if (_M_alloc_fun) | |
305 | return static_cast<char*>(_M_alloc_fun(n)); | |
eafa1afa | 306 | else |
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307 | return new char[n]; |
308 | } | |
309 | ||
310 | void | |
311 | strstreambuf::_M_free(char* p) | |
312 | { | |
313 | if (p) | |
314 | if (_M_free_fun) | |
315 | _M_free_fun(p); | |
316 | else | |
317 | delete[] p; | |
318 | } | |
319 | ||
320 | void | |
321 | strstreambuf::_M_setup(char* get, char* put, streamsize n) | |
322 | { | |
323 | if (get) | |
324 | { | |
325 | size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX); | |
497e42fd | 326 | |
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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* | |
356 | istrstream::rdbuf() const | |
357 | { return const_cast<strstreambuf*>(&_M_buf); } | |
358 | ||
359 | char* | |
360 | istrstream::str() | |
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* | |
375 | ostrstream::rdbuf() const | |
376 | { return const_cast<strstreambuf*>(&_M_buf); } | |
377 | ||
378 | void | |
379 | ostrstream::freeze(bool freezeflag) | |
380 | { _M_buf.freeze(freezeflag); } | |
381 | ||
382 | char* | |
383 | ostrstream::str() | |
384 | { return _M_buf.str(); } | |
385 | ||
386 | int | |
387 | ostrstream::pcount() const | |
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* | |
402 | strstream::rdbuf() const | |
403 | { return const_cast<strstreambuf*>(&_M_buf); } | |
404 | ||
405 | void | |
406 | strstream::freeze(bool freezeflag) | |
407 | { _M_buf.freeze(freezeflag); } | |
408 | ||
409 | int | |
410 | strstream::pcount() const | |
411 | { return _M_buf.pcount(); } | |
412 | ||
413 | char* | |
414 | strstream::str() | |
415 | { return _M_buf.str(); } | |
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416 | |
417 | _GLIBCXX_END_NAMESPACE |