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1 : // Components for manipulating sequences of characters -*- C++ -*-
2 :
3 : // Copyright (C) 1997-2014 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 3, 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 : // 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/>.
24 :
25 : /** @file bits/basic_string.tcc
26 : * This is an internal header file, included by other library headers.
27 : * Do not attempt to use it directly. @headername{string}
28 : */
29 :
30 : //
31 : // ISO C++ 14882: 21 Strings library
32 : //
33 :
34 : // Written by Jason Merrill based upon the specification by Takanori Adachi
35 : // in ANSI X3J16/94-0013R2. Rewritten by Nathan Myers to ISO-14882.
36 :
37 : #ifndef _BASIC_STRING_TCC
38 : #define _BASIC_STRING_TCC 1
39 :
40 : #pragma GCC system_header
41 :
42 : #include <bits/cxxabi_forced.h>
43 :
44 : namespace std _GLIBCXX_VISIBILITY(default)
45 : {
46 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
47 :
48 : template<typename _CharT, typename _Traits, typename _Alloc>
49 : const typename basic_string<_CharT, _Traits, _Alloc>::size_type
50 : basic_string<_CharT, _Traits, _Alloc>::
51 : _Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;
52 :
53 : template<typename _CharT, typename _Traits, typename _Alloc>
54 : const _CharT
55 : basic_string<_CharT, _Traits, _Alloc>::
56 : _Rep::_S_terminal = _CharT();
57 :
58 : template<typename _CharT, typename _Traits, typename _Alloc>
59 : const typename basic_string<_CharT, _Traits, _Alloc>::size_type
60 : basic_string<_CharT, _Traits, _Alloc>::npos;
61 :
62 : // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
63 : // at static init time (before static ctors are run).
64 : template<typename _CharT, typename _Traits, typename _Alloc>
65 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
66 : basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
67 : (sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
68 : sizeof(size_type)];
69 :
70 : // NB: This is the special case for Input Iterators, used in
71 : // istreambuf_iterators, etc.
72 : // Input Iterators have a cost structure very different from
73 : // pointers, calling for a different coding style.
74 : template<typename _CharT, typename _Traits, typename _Alloc>
75 : template<typename _InIterator>
76 : _CharT*
77 : basic_string<_CharT, _Traits, _Alloc>::
78 : _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
79 : input_iterator_tag)
80 : {
81 : #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
82 : if (__beg == __end && __a == _Alloc())
83 : return _S_empty_rep()._M_refdata();
84 : #endif
85 : // Avoid reallocation for common case.
86 : _CharT __buf[128];
87 : size_type __len = 0;
88 : while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
89 : {
90 : __buf[__len++] = *__beg;
91 : ++__beg;
92 : }
93 : _Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
94 : _M_copy(__r->_M_refdata(), __buf, __len);
95 : __try
96 : {
97 : while (__beg != __end)
98 : {
99 : if (__len == __r->_M_capacity)
100 : {
101 : // Allocate more space.
102 : _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
103 : _M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
104 : __r->_M_destroy(__a);
105 : __r = __another;
106 : }
107 : __r->_M_refdata()[__len++] = *__beg;
108 : ++__beg;
109 : }
110 : }
111 : __catch(...)
112 : {
113 : __r->_M_destroy(__a);
114 : __throw_exception_again;
115 : }
116 : __r->_M_set_length_and_sharable(__len);
117 : return __r->_M_refdata();
118 : }
119 :
120 : template<typename _CharT, typename _Traits, typename _Alloc>
121 : template <typename _InIterator>
122 : _CharT*
123 64 : basic_string<_CharT, _Traits, _Alloc>::
124 : _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
125 : forward_iterator_tag)
126 : {
127 : #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
128 64 : if (__beg == __end && __a == _Alloc())
129 0 : return _S_empty_rep()._M_refdata();
130 : #endif
131 : // NB: Not required, but considered best practice.
132 64 : if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
133 0 : __throw_logic_error(__N("basic_string::_S_construct null not valid"));
134 :
135 : const size_type __dnew = static_cast<size_type>(std::distance(__beg,
136 64 : __end));
137 : // Check for out_of_range and length_error exceptions.
138 64 : _Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
139 : __try
140 64 : { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
141 : __catch(...)
142 : {
143 : __r->_M_destroy(__a);
144 : __throw_exception_again;
145 : }
146 64 : __r->_M_set_length_and_sharable(__dnew);
147 64 : return __r->_M_refdata();
148 : }
149 :
150 : template<typename _CharT, typename _Traits, typename _Alloc>
151 : _CharT*
152 : basic_string<_CharT, _Traits, _Alloc>::
153 : _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
154 : {
155 : #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
156 : if (__n == 0 && __a == _Alloc())
157 : return _S_empty_rep()._M_refdata();
158 : #endif
159 : // Check for out_of_range and length_error exceptions.
160 : _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
161 : if (__n)
162 : _M_assign(__r->_M_refdata(), __n, __c);
163 :
164 : __r->_M_set_length_and_sharable(__n);
165 : return __r->_M_refdata();
166 : }
167 :
168 : template<typename _CharT, typename _Traits, typename _Alloc>
169 : basic_string<_CharT, _Traits, _Alloc>::
170 : basic_string(const basic_string& __str)
171 : : _M_dataplus(__str._M_rep()->_M_grab(_Alloc(__str.get_allocator()),
172 : __str.get_allocator()),
173 : __str.get_allocator())
174 : { }
175 :
176 : template<typename _CharT, typename _Traits, typename _Alloc>
177 : basic_string<_CharT, _Traits, _Alloc>::
178 : basic_string(const _Alloc& __a)
179 : : _M_dataplus(_S_construct(size_type(), _CharT(), __a), __a)
180 : { }
181 :
182 : template<typename _CharT, typename _Traits, typename _Alloc>
183 : basic_string<_CharT, _Traits, _Alloc>::
184 : basic_string(const basic_string& __str, size_type __pos, size_type __n)
185 : : _M_dataplus(_S_construct(__str._M_data()
186 : + __str._M_check(__pos,
187 : "basic_string::basic_string"),
188 : __str._M_data() + __str._M_limit(__pos, __n)
189 : + __pos, _Alloc()), _Alloc())
190 : { }
191 :
192 : template<typename _CharT, typename _Traits, typename _Alloc>
193 : basic_string<_CharT, _Traits, _Alloc>::
194 : basic_string(const basic_string& __str, size_type __pos,
195 : size_type __n, const _Alloc& __a)
196 : : _M_dataplus(_S_construct(__str._M_data()
197 : + __str._M_check(__pos,
198 : "basic_string::basic_string"),
199 : __str._M_data() + __str._M_limit(__pos, __n)
200 : + __pos, __a), __a)
201 : { }
202 :
203 : // TBD: DPG annotate
204 : template<typename _CharT, typename _Traits, typename _Alloc>
205 : basic_string<_CharT, _Traits, _Alloc>::
206 : basic_string(const _CharT* __s, size_type __n, const _Alloc& __a)
207 : : _M_dataplus(_S_construct(__s, __s + __n, __a), __a)
208 : { }
209 :
210 : // TBD: DPG annotate
211 : template<typename _CharT, typename _Traits, typename _Alloc>
212 : basic_string<_CharT, _Traits, _Alloc>::
213 : basic_string(const _CharT* __s, const _Alloc& __a)
214 : : _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) :
215 : __s + npos, __a), __a)
216 : { }
217 :
218 : template<typename _CharT, typename _Traits, typename _Alloc>
219 : basic_string<_CharT, _Traits, _Alloc>::
220 : basic_string(size_type __n, _CharT __c, const _Alloc& __a)
221 : : _M_dataplus(_S_construct(__n, __c, __a), __a)
222 : { }
223 :
224 : // TBD: DPG annotate
225 : template<typename _CharT, typename _Traits, typename _Alloc>
226 : template<typename _InputIterator>
227 64 : basic_string<_CharT, _Traits, _Alloc>::
228 : basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a)
229 64 : : _M_dataplus(_S_construct(__beg, __end, __a), __a)
230 64 : { }
231 :
232 : #if __cplusplus >= 201103L
233 : template<typename _CharT, typename _Traits, typename _Alloc>
234 : basic_string<_CharT, _Traits, _Alloc>::
235 : basic_string(initializer_list<_CharT> __l, const _Alloc& __a)
236 : : _M_dataplus(_S_construct(__l.begin(), __l.end(), __a), __a)
237 : { }
238 : #endif
239 :
240 : template<typename _CharT, typename _Traits, typename _Alloc>
241 : basic_string<_CharT, _Traits, _Alloc>&
242 : basic_string<_CharT, _Traits, _Alloc>::
243 : assign(const basic_string& __str)
244 : {
245 : if (_M_rep() != __str._M_rep())
246 : {
247 : // XXX MT
248 : const allocator_type __a = this->get_allocator();
249 : _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
250 : _M_rep()->_M_dispose(__a);
251 : _M_data(__tmp);
252 : }
253 : return *this;
254 : }
255 :
256 : template<typename _CharT, typename _Traits, typename _Alloc>
257 : basic_string<_CharT, _Traits, _Alloc>&
258 : basic_string<_CharT, _Traits, _Alloc>::
259 : assign(const _CharT* __s, size_type __n)
260 : {
261 : __glibcxx_requires_string_len(__s, __n);
262 : _M_check_length(this->size(), __n, "basic_string::assign");
263 : if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
264 : return _M_replace_safe(size_type(0), this->size(), __s, __n);
265 : else
266 : {
267 : // Work in-place.
268 : const size_type __pos = __s - _M_data();
269 : if (__pos >= __n)
270 : _M_copy(_M_data(), __s, __n);
271 : else if (__pos)
272 : _M_move(_M_data(), __s, __n);
273 : _M_rep()->_M_set_length_and_sharable(__n);
274 : return *this;
275 : }
276 : }
277 :
278 : template<typename _CharT, typename _Traits, typename _Alloc>
279 : basic_string<_CharT, _Traits, _Alloc>&
280 : basic_string<_CharT, _Traits, _Alloc>::
281 : append(size_type __n, _CharT __c)
282 : {
283 : if (__n)
284 : {
285 : _M_check_length(size_type(0), __n, "basic_string::append");
286 : const size_type __len = __n + this->size();
287 : if (__len > this->capacity() || _M_rep()->_M_is_shared())
288 : this->reserve(__len);
289 : _M_assign(_M_data() + this->size(), __n, __c);
290 : _M_rep()->_M_set_length_and_sharable(__len);
291 : }
292 : return *this;
293 : }
294 :
295 : template<typename _CharT, typename _Traits, typename _Alloc>
296 : basic_string<_CharT, _Traits, _Alloc>&
297 : basic_string<_CharT, _Traits, _Alloc>::
298 : append(const _CharT* __s, size_type __n)
299 : {
300 : __glibcxx_requires_string_len(__s, __n);
301 : if (__n)
302 : {
303 : _M_check_length(size_type(0), __n, "basic_string::append");
304 : const size_type __len = __n + this->size();
305 : if (__len > this->capacity() || _M_rep()->_M_is_shared())
306 : {
307 : if (_M_disjunct(__s))
308 : this->reserve(__len);
309 : else
310 : {
311 : const size_type __off = __s - _M_data();
312 : this->reserve(__len);
313 : __s = _M_data() + __off;
314 : }
315 : }
316 : _M_copy(_M_data() + this->size(), __s, __n);
317 : _M_rep()->_M_set_length_and_sharable(__len);
318 : }
319 : return *this;
320 : }
321 :
322 : template<typename _CharT, typename _Traits, typename _Alloc>
323 : basic_string<_CharT, _Traits, _Alloc>&
324 : basic_string<_CharT, _Traits, _Alloc>::
325 : append(const basic_string& __str)
326 : {
327 : const size_type __size = __str.size();
328 : if (__size)
329 : {
330 : const size_type __len = __size + this->size();
331 : if (__len > this->capacity() || _M_rep()->_M_is_shared())
332 : this->reserve(__len);
333 : _M_copy(_M_data() + this->size(), __str._M_data(), __size);
334 : _M_rep()->_M_set_length_and_sharable(__len);
335 : }
336 : return *this;
337 : }
338 :
339 : template<typename _CharT, typename _Traits, typename _Alloc>
340 : basic_string<_CharT, _Traits, _Alloc>&
341 : basic_string<_CharT, _Traits, _Alloc>::
342 : append(const basic_string& __str, size_type __pos, size_type __n)
343 : {
344 : __str._M_check(__pos, "basic_string::append");
345 : __n = __str._M_limit(__pos, __n);
346 : if (__n)
347 : {
348 : const size_type __len = __n + this->size();
349 : if (__len > this->capacity() || _M_rep()->_M_is_shared())
350 : this->reserve(__len);
351 : _M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
352 : _M_rep()->_M_set_length_and_sharable(__len);
353 : }
354 : return *this;
355 : }
356 :
357 : template<typename _CharT, typename _Traits, typename _Alloc>
358 : basic_string<_CharT, _Traits, _Alloc>&
359 : basic_string<_CharT, _Traits, _Alloc>::
360 : insert(size_type __pos, const _CharT* __s, size_type __n)
361 : {
362 : __glibcxx_requires_string_len(__s, __n);
363 : _M_check(__pos, "basic_string::insert");
364 : _M_check_length(size_type(0), __n, "basic_string::insert");
365 : if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
366 : return _M_replace_safe(__pos, size_type(0), __s, __n);
367 : else
368 : {
369 : // Work in-place.
370 : const size_type __off = __s - _M_data();
371 : _M_mutate(__pos, 0, __n);
372 : __s = _M_data() + __off;
373 : _CharT* __p = _M_data() + __pos;
374 : if (__s + __n <= __p)
375 : _M_copy(__p, __s, __n);
376 : else if (__s >= __p)
377 : _M_copy(__p, __s + __n, __n);
378 : else
379 : {
380 : const size_type __nleft = __p - __s;
381 : _M_copy(__p, __s, __nleft);
382 : _M_copy(__p + __nleft, __p + __n, __n - __nleft);
383 : }
384 : return *this;
385 : }
386 : }
387 :
388 : template<typename _CharT, typename _Traits, typename _Alloc>
389 : typename basic_string<_CharT, _Traits, _Alloc>::iterator
390 : basic_string<_CharT, _Traits, _Alloc>::
391 : erase(iterator __first, iterator __last)
392 : {
393 : _GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
394 : && __last <= _M_iend());
395 :
396 : // NB: This isn't just an optimization (bail out early when
397 : // there is nothing to do, really), it's also a correctness
398 : // issue vs MT, see libstdc++/40518.
399 : const size_type __size = __last - __first;
400 : if (__size)
401 : {
402 : const size_type __pos = __first - _M_ibegin();
403 : _M_mutate(__pos, __size, size_type(0));
404 : _M_rep()->_M_set_leaked();
405 : return iterator(_M_data() + __pos);
406 : }
407 : else
408 : return __first;
409 : }
410 :
411 : template<typename _CharT, typename _Traits, typename _Alloc>
412 : basic_string<_CharT, _Traits, _Alloc>&
413 : basic_string<_CharT, _Traits, _Alloc>::
414 : replace(size_type __pos, size_type __n1, const _CharT* __s,
415 : size_type __n2)
416 : {
417 : __glibcxx_requires_string_len(__s, __n2);
418 : _M_check(__pos, "basic_string::replace");
419 : __n1 = _M_limit(__pos, __n1);
420 : _M_check_length(__n1, __n2, "basic_string::replace");
421 : bool __left;
422 : if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
423 : return _M_replace_safe(__pos, __n1, __s, __n2);
424 : else if ((__left = __s + __n2 <= _M_data() + __pos)
425 : || _M_data() + __pos + __n1 <= __s)
426 : {
427 : // Work in-place: non-overlapping case.
428 : size_type __off = __s - _M_data();
429 : __left ? __off : (__off += __n2 - __n1);
430 : _M_mutate(__pos, __n1, __n2);
431 : _M_copy(_M_data() + __pos, _M_data() + __off, __n2);
432 : return *this;
433 : }
434 : else
435 : {
436 : // Todo: overlapping case.
437 : const basic_string __tmp(__s, __n2);
438 : return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
439 : }
440 : }
441 :
442 : template<typename _CharT, typename _Traits, typename _Alloc>
443 : void
444 : basic_string<_CharT, _Traits, _Alloc>::_Rep::
445 : _M_destroy(const _Alloc& __a) throw ()
446 : {
447 : const size_type __size = sizeof(_Rep_base) +
448 : (this->_M_capacity + 1) * sizeof(_CharT);
449 : _Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
450 : }
451 :
452 : template<typename _CharT, typename _Traits, typename _Alloc>
453 : void
454 : basic_string<_CharT, _Traits, _Alloc>::
455 : _M_leak_hard()
456 : {
457 : #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
458 : if (_M_rep() == &_S_empty_rep())
459 : return;
460 : #endif
461 : if (_M_rep()->_M_is_shared())
462 : _M_mutate(0, 0, 0);
463 : _M_rep()->_M_set_leaked();
464 : }
465 :
466 : template<typename _CharT, typename _Traits, typename _Alloc>
467 : void
468 : basic_string<_CharT, _Traits, _Alloc>::
469 : _M_mutate(size_type __pos, size_type __len1, size_type __len2)
470 : {
471 : const size_type __old_size = this->size();
472 : const size_type __new_size = __old_size + __len2 - __len1;
473 : const size_type __how_much = __old_size - __pos - __len1;
474 :
475 : if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
476 : {
477 : // Must reallocate.
478 : const allocator_type __a = get_allocator();
479 : _Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);
480 :
481 : if (__pos)
482 : _M_copy(__r->_M_refdata(), _M_data(), __pos);
483 : if (__how_much)
484 : _M_copy(__r->_M_refdata() + __pos + __len2,
485 : _M_data() + __pos + __len1, __how_much);
486 :
487 : _M_rep()->_M_dispose(__a);
488 : _M_data(__r->_M_refdata());
489 : }
490 : else if (__how_much && __len1 != __len2)
491 : {
492 : // Work in-place.
493 : _M_move(_M_data() + __pos + __len2,
494 : _M_data() + __pos + __len1, __how_much);
495 : }
496 : _M_rep()->_M_set_length_and_sharable(__new_size);
497 : }
498 :
499 : template<typename _CharT, typename _Traits, typename _Alloc>
500 : void
501 : basic_string<_CharT, _Traits, _Alloc>::
502 : reserve(size_type __res)
503 : {
504 : if (__res != this->capacity() || _M_rep()->_M_is_shared())
505 : {
506 : // Make sure we don't shrink below the current size
507 : if (__res < this->size())
508 : __res = this->size();
509 : const allocator_type __a = get_allocator();
510 : _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
511 : _M_rep()->_M_dispose(__a);
512 : _M_data(__tmp);
513 : }
514 : }
515 :
516 : template<typename _CharT, typename _Traits, typename _Alloc>
517 : void
518 : basic_string<_CharT, _Traits, _Alloc>::
519 : swap(basic_string& __s)
520 : {
521 : if (_M_rep()->_M_is_leaked())
522 : _M_rep()->_M_set_sharable();
523 : if (__s._M_rep()->_M_is_leaked())
524 : __s._M_rep()->_M_set_sharable();
525 : if (this->get_allocator() == __s.get_allocator())
526 : {
527 : _CharT* __tmp = _M_data();
528 : _M_data(__s._M_data());
529 : __s._M_data(__tmp);
530 : }
531 : // The code below can usually be optimized away.
532 : else
533 : {
534 : const basic_string __tmp1(_M_ibegin(), _M_iend(),
535 : __s.get_allocator());
536 : const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
537 : this->get_allocator());
538 : *this = __tmp2;
539 : __s = __tmp1;
540 : }
541 : }
542 :
543 : template<typename _CharT, typename _Traits, typename _Alloc>
544 : typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
545 : basic_string<_CharT, _Traits, _Alloc>::_Rep::
546 : _S_create(size_type __capacity, size_type __old_capacity,
547 : const _Alloc& __alloc)
548 : {
549 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
550 : // 83. String::npos vs. string::max_size()
551 : if (__capacity > _S_max_size)
552 : __throw_length_error(__N("basic_string::_S_create"));
553 :
554 : // The standard places no restriction on allocating more memory
555 : // than is strictly needed within this layer at the moment or as
556 : // requested by an explicit application call to reserve().
557 :
558 : // Many malloc implementations perform quite poorly when an
559 : // application attempts to allocate memory in a stepwise fashion
560 : // growing each allocation size by only 1 char. Additionally,
561 : // it makes little sense to allocate less linear memory than the
562 : // natural blocking size of the malloc implementation.
563 : // Unfortunately, we would need a somewhat low-level calculation
564 : // with tuned parameters to get this perfect for any particular
565 : // malloc implementation. Fortunately, generalizations about
566 : // common features seen among implementations seems to suffice.
567 :
568 : // __pagesize need not match the actual VM page size for good
569 : // results in practice, thus we pick a common value on the low
570 : // side. __malloc_header_size is an estimate of the amount of
571 : // overhead per memory allocation (in practice seen N * sizeof
572 : // (void*) where N is 0, 2 or 4). According to folklore,
573 : // picking this value on the high side is better than
574 : // low-balling it (especially when this algorithm is used with
575 : // malloc implementations that allocate memory blocks rounded up
576 : // to a size which is a power of 2).
577 : const size_type __pagesize = 4096;
578 : const size_type __malloc_header_size = 4 * sizeof(void*);
579 :
580 : // The below implements an exponential growth policy, necessary to
581 : // meet amortized linear time requirements of the library: see
582 : // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
583 : // It's active for allocations requiring an amount of memory above
584 : // system pagesize. This is consistent with the requirements of the
585 : // standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
586 : if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
587 : __capacity = 2 * __old_capacity;
588 :
589 : // NB: Need an array of char_type[__capacity], plus a terminating
590 : // null char_type() element, plus enough for the _Rep data structure.
591 : // Whew. Seemingly so needy, yet so elemental.
592 : size_type __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
593 :
594 : const size_type __adj_size = __size + __malloc_header_size;
595 : if (__adj_size > __pagesize && __capacity > __old_capacity)
596 : {
597 : const size_type __extra = __pagesize - __adj_size % __pagesize;
598 : __capacity += __extra / sizeof(_CharT);
599 : // Never allocate a string bigger than _S_max_size.
600 : if (__capacity > _S_max_size)
601 : __capacity = _S_max_size;
602 : __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
603 : }
604 :
605 : // NB: Might throw, but no worries about a leak, mate: _Rep()
606 : // does not throw.
607 : void* __place = _Raw_bytes_alloc(__alloc).allocate(__size);
608 : _Rep *__p = new (__place) _Rep;
609 : __p->_M_capacity = __capacity;
610 : // ABI compatibility - 3.4.x set in _S_create both
611 : // _M_refcount and _M_length. All callers of _S_create
612 : // in basic_string.tcc then set just _M_length.
613 : // In 4.0.x and later both _M_refcount and _M_length
614 : // are initialized in the callers, unfortunately we can
615 : // have 3.4.x compiled code with _S_create callers inlined
616 : // calling 4.0.x+ _S_create.
617 : __p->_M_set_sharable();
618 : return __p;
619 : }
620 :
621 : template<typename _CharT, typename _Traits, typename _Alloc>
622 : _CharT*
623 : basic_string<_CharT, _Traits, _Alloc>::_Rep::
624 : _M_clone(const _Alloc& __alloc, size_type __res)
625 : {
626 : // Requested capacity of the clone.
627 : const size_type __requested_cap = this->_M_length + __res;
628 : _Rep* __r = _Rep::_S_create(__requested_cap, this->_M_capacity,
629 : __alloc);
630 : if (this->_M_length)
631 : _M_copy(__r->_M_refdata(), _M_refdata(), this->_M_length);
632 :
633 : __r->_M_set_length_and_sharable(this->_M_length);
634 : return __r->_M_refdata();
635 : }
636 :
637 : template<typename _CharT, typename _Traits, typename _Alloc>
638 : void
639 : basic_string<_CharT, _Traits, _Alloc>::
640 : resize(size_type __n, _CharT __c)
641 : {
642 : const size_type __size = this->size();
643 : _M_check_length(__size, __n, "basic_string::resize");
644 : if (__size < __n)
645 : this->append(__n - __size, __c);
646 : else if (__n < __size)
647 : this->erase(__n);
648 : // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
649 : }
650 :
651 : template<typename _CharT, typename _Traits, typename _Alloc>
652 : template<typename _InputIterator>
653 : basic_string<_CharT, _Traits, _Alloc>&
654 : basic_string<_CharT, _Traits, _Alloc>::
655 : _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
656 : _InputIterator __k2, __false_type)
657 : {
658 : const basic_string __s(__k1, __k2);
659 : const size_type __n1 = __i2 - __i1;
660 : _M_check_length(__n1, __s.size(), "basic_string::_M_replace_dispatch");
661 : return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
662 : __s.size());
663 : }
664 :
665 : template<typename _CharT, typename _Traits, typename _Alloc>
666 : basic_string<_CharT, _Traits, _Alloc>&
667 : basic_string<_CharT, _Traits, _Alloc>::
668 : _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
669 : _CharT __c)
670 : {
671 : _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
672 : _M_mutate(__pos1, __n1, __n2);
673 : if (__n2)
674 : _M_assign(_M_data() + __pos1, __n2, __c);
675 : return *this;
676 : }
677 :
678 : template<typename _CharT, typename _Traits, typename _Alloc>
679 : basic_string<_CharT, _Traits, _Alloc>&
680 : basic_string<_CharT, _Traits, _Alloc>::
681 : _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
682 : size_type __n2)
683 : {
684 : _M_mutate(__pos1, __n1, __n2);
685 : if (__n2)
686 : _M_copy(_M_data() + __pos1, __s, __n2);
687 : return *this;
688 : }
689 :
690 : template<typename _CharT, typename _Traits, typename _Alloc>
691 : basic_string<_CharT, _Traits, _Alloc>
692 : operator+(const _CharT* __lhs,
693 : const basic_string<_CharT, _Traits, _Alloc>& __rhs)
694 : {
695 : __glibcxx_requires_string(__lhs);
696 : typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
697 : typedef typename __string_type::size_type __size_type;
698 : const __size_type __len = _Traits::length(__lhs);
699 : __string_type __str;
700 : __str.reserve(__len + __rhs.size());
701 : __str.append(__lhs, __len);
702 : __str.append(__rhs);
703 : return __str;
704 : }
705 :
706 : template<typename _CharT, typename _Traits, typename _Alloc>
707 : basic_string<_CharT, _Traits, _Alloc>
708 : operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
709 : {
710 : typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
711 : typedef typename __string_type::size_type __size_type;
712 : __string_type __str;
713 : const __size_type __len = __rhs.size();
714 : __str.reserve(__len + 1);
715 : __str.append(__size_type(1), __lhs);
716 : __str.append(__rhs);
717 : return __str;
718 : }
719 :
720 : template<typename _CharT, typename _Traits, typename _Alloc>
721 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
722 : basic_string<_CharT, _Traits, _Alloc>::
723 : copy(_CharT* __s, size_type __n, size_type __pos) const
724 : {
725 : _M_check(__pos, "basic_string::copy");
726 : __n = _M_limit(__pos, __n);
727 : __glibcxx_requires_string_len(__s, __n);
728 : if (__n)
729 : _M_copy(__s, _M_data() + __pos, __n);
730 : // 21.3.5.7 par 3: do not append null. (good.)
731 : return __n;
732 : }
733 :
734 : template<typename _CharT, typename _Traits, typename _Alloc>
735 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
736 : basic_string<_CharT, _Traits, _Alloc>::
737 : find(const _CharT* __s, size_type __pos, size_type __n) const
738 : {
739 : __glibcxx_requires_string_len(__s, __n);
740 : const size_type __size = this->size();
741 : const _CharT* __data = _M_data();
742 :
743 : if (__n == 0)
744 : return __pos <= __size ? __pos : npos;
745 :
746 : if (__n <= __size)
747 : {
748 : for (; __pos <= __size - __n; ++__pos)
749 : if (traits_type::eq(__data[__pos], __s[0])
750 : && traits_type::compare(__data + __pos + 1,
751 : __s + 1, __n - 1) == 0)
752 : return __pos;
753 : }
754 : return npos;
755 : }
756 :
757 : template<typename _CharT, typename _Traits, typename _Alloc>
758 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
759 : basic_string<_CharT, _Traits, _Alloc>::
760 : find(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
761 : {
762 : size_type __ret = npos;
763 : const size_type __size = this->size();
764 : if (__pos < __size)
765 : {
766 : const _CharT* __data = _M_data();
767 : const size_type __n = __size - __pos;
768 : const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
769 : if (__p)
770 : __ret = __p - __data;
771 : }
772 : return __ret;
773 : }
774 :
775 : template<typename _CharT, typename _Traits, typename _Alloc>
776 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
777 : basic_string<_CharT, _Traits, _Alloc>::
778 : rfind(const _CharT* __s, size_type __pos, size_type __n) const
779 : {
780 : __glibcxx_requires_string_len(__s, __n);
781 : const size_type __size = this->size();
782 : if (__n <= __size)
783 : {
784 : __pos = std::min(size_type(__size - __n), __pos);
785 : const _CharT* __data = _M_data();
786 : do
787 : {
788 : if (traits_type::compare(__data + __pos, __s, __n) == 0)
789 : return __pos;
790 : }
791 : while (__pos-- > 0);
792 : }
793 : return npos;
794 : }
795 :
796 : template<typename _CharT, typename _Traits, typename _Alloc>
797 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
798 : basic_string<_CharT, _Traits, _Alloc>::
799 : rfind(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
800 : {
801 : size_type __size = this->size();
802 : if (__size)
803 : {
804 : if (--__size > __pos)
805 : __size = __pos;
806 : for (++__size; __size-- > 0; )
807 : if (traits_type::eq(_M_data()[__size], __c))
808 : return __size;
809 : }
810 : return npos;
811 : }
812 :
813 : template<typename _CharT, typename _Traits, typename _Alloc>
814 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
815 : basic_string<_CharT, _Traits, _Alloc>::
816 : find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
817 : {
818 : __glibcxx_requires_string_len(__s, __n);
819 : for (; __n && __pos < this->size(); ++__pos)
820 : {
821 : const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
822 : if (__p)
823 : return __pos;
824 : }
825 : return npos;
826 : }
827 :
828 : template<typename _CharT, typename _Traits, typename _Alloc>
829 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
830 : basic_string<_CharT, _Traits, _Alloc>::
831 : find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
832 : {
833 : __glibcxx_requires_string_len(__s, __n);
834 : size_type __size = this->size();
835 : if (__size && __n)
836 : {
837 : if (--__size > __pos)
838 : __size = __pos;
839 : do
840 : {
841 : if (traits_type::find(__s, __n, _M_data()[__size]))
842 : return __size;
843 : }
844 : while (__size-- != 0);
845 : }
846 : return npos;
847 : }
848 :
849 : template<typename _CharT, typename _Traits, typename _Alloc>
850 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
851 : basic_string<_CharT, _Traits, _Alloc>::
852 : find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
853 : {
854 : __glibcxx_requires_string_len(__s, __n);
855 : for (; __pos < this->size(); ++__pos)
856 : if (!traits_type::find(__s, __n, _M_data()[__pos]))
857 : return __pos;
858 : return npos;
859 : }
860 :
861 : template<typename _CharT, typename _Traits, typename _Alloc>
862 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
863 : basic_string<_CharT, _Traits, _Alloc>::
864 : find_first_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
865 : {
866 : for (; __pos < this->size(); ++__pos)
867 : if (!traits_type::eq(_M_data()[__pos], __c))
868 : return __pos;
869 : return npos;
870 : }
871 :
872 : template<typename _CharT, typename _Traits, typename _Alloc>
873 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
874 : basic_string<_CharT, _Traits, _Alloc>::
875 : find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
876 : {
877 : __glibcxx_requires_string_len(__s, __n);
878 : size_type __size = this->size();
879 : if (__size)
880 : {
881 : if (--__size > __pos)
882 : __size = __pos;
883 : do
884 : {
885 : if (!traits_type::find(__s, __n, _M_data()[__size]))
886 : return __size;
887 : }
888 : while (__size--);
889 : }
890 : return npos;
891 : }
892 :
893 : template<typename _CharT, typename _Traits, typename _Alloc>
894 : typename basic_string<_CharT, _Traits, _Alloc>::size_type
895 : basic_string<_CharT, _Traits, _Alloc>::
896 : find_last_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
897 : {
898 : size_type __size = this->size();
899 : if (__size)
900 : {
901 : if (--__size > __pos)
902 : __size = __pos;
903 : do
904 : {
905 : if (!traits_type::eq(_M_data()[__size], __c))
906 : return __size;
907 : }
908 : while (__size--);
909 : }
910 : return npos;
911 : }
912 :
913 : template<typename _CharT, typename _Traits, typename _Alloc>
914 : int
915 : basic_string<_CharT, _Traits, _Alloc>::
916 : compare(size_type __pos, size_type __n, const basic_string& __str) const
917 : {
918 : _M_check(__pos, "basic_string::compare");
919 : __n = _M_limit(__pos, __n);
920 : const size_type __osize = __str.size();
921 : const size_type __len = std::min(__n, __osize);
922 : int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
923 : if (!__r)
924 : __r = _S_compare(__n, __osize);
925 : return __r;
926 : }
927 :
928 : template<typename _CharT, typename _Traits, typename _Alloc>
929 : int
930 : basic_string<_CharT, _Traits, _Alloc>::
931 : compare(size_type __pos1, size_type __n1, const basic_string& __str,
932 : size_type __pos2, size_type __n2) const
933 : {
934 : _M_check(__pos1, "basic_string::compare");
935 : __str._M_check(__pos2, "basic_string::compare");
936 : __n1 = _M_limit(__pos1, __n1);
937 : __n2 = __str._M_limit(__pos2, __n2);
938 : const size_type __len = std::min(__n1, __n2);
939 : int __r = traits_type::compare(_M_data() + __pos1,
940 : __str.data() + __pos2, __len);
941 : if (!__r)
942 : __r = _S_compare(__n1, __n2);
943 : return __r;
944 : }
945 :
946 : template<typename _CharT, typename _Traits, typename _Alloc>
947 : int
948 : basic_string<_CharT, _Traits, _Alloc>::
949 : compare(const _CharT* __s) const
950 : {
951 : __glibcxx_requires_string(__s);
952 : const size_type __size = this->size();
953 : const size_type __osize = traits_type::length(__s);
954 : const size_type __len = std::min(__size, __osize);
955 : int __r = traits_type::compare(_M_data(), __s, __len);
956 : if (!__r)
957 : __r = _S_compare(__size, __osize);
958 : return __r;
959 : }
960 :
961 : template<typename _CharT, typename _Traits, typename _Alloc>
962 : int
963 : basic_string <_CharT, _Traits, _Alloc>::
964 : compare(size_type __pos, size_type __n1, const _CharT* __s) const
965 : {
966 : __glibcxx_requires_string(__s);
967 : _M_check(__pos, "basic_string::compare");
968 : __n1 = _M_limit(__pos, __n1);
969 : const size_type __osize = traits_type::length(__s);
970 : const size_type __len = std::min(__n1, __osize);
971 : int __r = traits_type::compare(_M_data() + __pos, __s, __len);
972 : if (!__r)
973 : __r = _S_compare(__n1, __osize);
974 : return __r;
975 : }
976 :
977 : template<typename _CharT, typename _Traits, typename _Alloc>
978 : int
979 : basic_string <_CharT, _Traits, _Alloc>::
980 : compare(size_type __pos, size_type __n1, const _CharT* __s,
981 : size_type __n2) const
982 : {
983 : __glibcxx_requires_string_len(__s, __n2);
984 : _M_check(__pos, "basic_string::compare");
985 : __n1 = _M_limit(__pos, __n1);
986 : const size_type __len = std::min(__n1, __n2);
987 : int __r = traits_type::compare(_M_data() + __pos, __s, __len);
988 : if (!__r)
989 : __r = _S_compare(__n1, __n2);
990 : return __r;
991 : }
992 :
993 : // 21.3.7.9 basic_string::getline and operators
994 : template<typename _CharT, typename _Traits, typename _Alloc>
995 : basic_istream<_CharT, _Traits>&
996 : operator>>(basic_istream<_CharT, _Traits>& __in,
997 : basic_string<_CharT, _Traits, _Alloc>& __str)
998 : {
999 : typedef basic_istream<_CharT, _Traits> __istream_type;
1000 : typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
1001 : typedef typename __istream_type::ios_base __ios_base;
1002 : typedef typename __istream_type::int_type __int_type;
1003 : typedef typename __string_type::size_type __size_type;
1004 : typedef ctype<_CharT> __ctype_type;
1005 : typedef typename __ctype_type::ctype_base __ctype_base;
1006 :
1007 : __size_type __extracted = 0;
1008 : typename __ios_base::iostate __err = __ios_base::goodbit;
1009 : typename __istream_type::sentry __cerb(__in, false);
1010 : if (__cerb)
1011 : {
1012 : __try
1013 : {
1014 : // Avoid reallocation for common case.
1015 : __str.erase();
1016 : _CharT __buf[128];
1017 : __size_type __len = 0;
1018 : const streamsize __w = __in.width();
1019 : const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
1020 : : __str.max_size();
1021 : const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
1022 : const __int_type __eof = _Traits::eof();
1023 : __int_type __c = __in.rdbuf()->sgetc();
1024 :
1025 : while (__extracted < __n
1026 : && !_Traits::eq_int_type(__c, __eof)
1027 : && !__ct.is(__ctype_base::space,
1028 : _Traits::to_char_type(__c)))
1029 : {
1030 : if (__len == sizeof(__buf) / sizeof(_CharT))
1031 : {
1032 : __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
1033 : __len = 0;
1034 : }
1035 : __buf[__len++] = _Traits::to_char_type(__c);
1036 : ++__extracted;
1037 : __c = __in.rdbuf()->snextc();
1038 : }
1039 : __str.append(__buf, __len);
1040 :
1041 : if (_Traits::eq_int_type(__c, __eof))
1042 : __err |= __ios_base::eofbit;
1043 : __in.width(0);
1044 : }
1045 : __catch(__cxxabiv1::__forced_unwind&)
1046 : {
1047 : __in._M_setstate(__ios_base::badbit);
1048 : __throw_exception_again;
1049 : }
1050 : __catch(...)
1051 : {
1052 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
1053 : // 91. Description of operator>> and getline() for string<>
1054 : // might cause endless loop
1055 : __in._M_setstate(__ios_base::badbit);
1056 : }
1057 : }
1058 : // 211. operator>>(istream&, string&) doesn't set failbit
1059 : if (!__extracted)
1060 : __err |= __ios_base::failbit;
1061 : if (__err)
1062 : __in.setstate(__err);
1063 : return __in;
1064 : }
1065 :
1066 : template<typename _CharT, typename _Traits, typename _Alloc>
1067 : basic_istream<_CharT, _Traits>&
1068 : getline(basic_istream<_CharT, _Traits>& __in,
1069 : basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
1070 : {
1071 : typedef basic_istream<_CharT, _Traits> __istream_type;
1072 : typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
1073 : typedef typename __istream_type::ios_base __ios_base;
1074 : typedef typename __istream_type::int_type __int_type;
1075 : typedef typename __string_type::size_type __size_type;
1076 :
1077 : __size_type __extracted = 0;
1078 : const __size_type __n = __str.max_size();
1079 : typename __ios_base::iostate __err = __ios_base::goodbit;
1080 : typename __istream_type::sentry __cerb(__in, true);
1081 : if (__cerb)
1082 : {
1083 : __try
1084 : {
1085 : __str.erase();
1086 : const __int_type __idelim = _Traits::to_int_type(__delim);
1087 : const __int_type __eof = _Traits::eof();
1088 : __int_type __c = __in.rdbuf()->sgetc();
1089 :
1090 : while (__extracted < __n
1091 : && !_Traits::eq_int_type(__c, __eof)
1092 : && !_Traits::eq_int_type(__c, __idelim))
1093 : {
1094 : __str += _Traits::to_char_type(__c);
1095 : ++__extracted;
1096 : __c = __in.rdbuf()->snextc();
1097 : }
1098 :
1099 : if (_Traits::eq_int_type(__c, __eof))
1100 : __err |= __ios_base::eofbit;
1101 : else if (_Traits::eq_int_type(__c, __idelim))
1102 : {
1103 : ++__extracted;
1104 : __in.rdbuf()->sbumpc();
1105 : }
1106 : else
1107 : __err |= __ios_base::failbit;
1108 : }
1109 : __catch(__cxxabiv1::__forced_unwind&)
1110 : {
1111 : __in._M_setstate(__ios_base::badbit);
1112 : __throw_exception_again;
1113 : }
1114 : __catch(...)
1115 : {
1116 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
1117 : // 91. Description of operator>> and getline() for string<>
1118 : // might cause endless loop
1119 : __in._M_setstate(__ios_base::badbit);
1120 : }
1121 : }
1122 : if (!__extracted)
1123 : __err |= __ios_base::failbit;
1124 : if (__err)
1125 : __in.setstate(__err);
1126 : return __in;
1127 : }
1128 :
1129 : // Inhibit implicit instantiations for required instantiations,
1130 : // which are defined via explicit instantiations elsewhere.
1131 : #if _GLIBCXX_EXTERN_TEMPLATE > 0
1132 : extern template class basic_string<char>;
1133 : extern template
1134 : basic_istream<char>&
1135 : operator>>(basic_istream<char>&, string&);
1136 : extern template
1137 : basic_ostream<char>&
1138 : operator<<(basic_ostream<char>&, const string&);
1139 : extern template
1140 : basic_istream<char>&
1141 : getline(basic_istream<char>&, string&, char);
1142 : extern template
1143 : basic_istream<char>&
1144 : getline(basic_istream<char>&, string&);
1145 :
1146 : #ifdef _GLIBCXX_USE_WCHAR_T
1147 : extern template class basic_string<wchar_t>;
1148 : extern template
1149 : basic_istream<wchar_t>&
1150 : operator>>(basic_istream<wchar_t>&, wstring&);
1151 : extern template
1152 : basic_ostream<wchar_t>&
1153 : operator<<(basic_ostream<wchar_t>&, const wstring&);
1154 : extern template
1155 : basic_istream<wchar_t>&
1156 : getline(basic_istream<wchar_t>&, wstring&, wchar_t);
1157 : extern template
1158 : basic_istream<wchar_t>&
1159 : getline(basic_istream<wchar_t>&, wstring&);
1160 : #endif
1161 : #endif
1162 :
1163 : _GLIBCXX_END_NAMESPACE_VERSION
1164 : } // namespace std
1165 :
1166 : #endif
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