1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
| // String based streams -*- C++ -*-
// Copyright (C) 1997-2017 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/sstream.tcc
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{sstream}
*/
//
// ISO C++ 14882: 27.7 String-based streams
//
#ifndef _SSTREAM_TCC
#define _SSTREAM_TCC 1
#pragma GCC system_header
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template <class _CharT, class _Traits, class _Alloc>
typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
basic_stringbuf<_CharT, _Traits, _Alloc>::
pbackfail(int_type __c)
{
int_type __ret = traits_type::eof();
if (this->eback() < this->gptr())
{
// Try to put back __c into input sequence in one of three ways.
// Order these tests done in is unspecified by the standard.
const bool __testeof = traits_type::eq_int_type(__c, __ret);
if (!__testeof)
{
const bool __testeq = traits_type::eq(traits_type::
to_char_type(__c),
this->gptr()[-1]);
const bool __testout = this->_M_mode & ios_base::out;
if (__testeq || __testout)
{
this->gbump(-1);
if (!__testeq)
*this->gptr() = traits_type::to_char_type(__c);
__ret = __c;
}
}
else
{
this->gbump(-1);
__ret = traits_type::not_eof(__c);
}
}
return __ret;
}
template <class _CharT, class _Traits, class _Alloc>
typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
basic_stringbuf<_CharT, _Traits, _Alloc>::
overflow(int_type __c)
{
const bool __testout = this->_M_mode & ios_base::out;
if (__builtin_expect(!__testout, false))
return traits_type::eof();
const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
if (__builtin_expect(__testeof, false))
return traits_type::not_eof(__c);
const __size_type __capacity = _M_string.capacity();
#if _GLIBCXX_USE_CXX11_ABI
if ((this->epptr() - this->pbase()) < __capacity)
{
// There is additional capacity in _M_string that can be used.
char_type* __base = const_cast<char_type*>(_M_string.data());
_M_pbump(__base, __base + __capacity, this->pptr() - this->pbase());
if (_M_mode & ios_base::in)
{
const __size_type __nget = this->gptr() - this->eback();
const __size_type __eget = this->egptr() - this->eback();
this->setg(__base, __base + __nget, __base + __eget + 1);
}
*this->pptr() = traits_type::to_char_type(__c);
this->pbump(1);
return __c;
}
#endif
const __size_type __max_size = _M_string.max_size();
const bool __testput = this->pptr() < this->epptr();
if (__builtin_expect(!__testput && __capacity == __max_size, false))
return traits_type::eof();
// Try to append __c into output sequence in one of two ways.
// Order these tests done in is unspecified by the standard.
const char_type __conv = traits_type::to_char_type(__c);
if (!__testput)
{
// NB: Start ostringstream buffers at 512 chars. This is an
// experimental value (pronounced "arbitrary" in some of the
// hipper English-speaking countries), and can be changed to
// suit particular needs.
//
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 169. Bad efficiency of overflow() mandated
// 432. stringbuf::overflow() makes only one write position
// available
const __size_type __opt_len = std::max(__size_type(2 * __capacity),
__size_type(512));
const __size_type __len = std::min(__opt_len, __max_size);
__string_type __tmp;
__tmp.reserve(__len);
if (this->pbase())
__tmp.assign(this->pbase(), this->epptr() - this->pbase());
__tmp.push_back(__conv);
_M_string.swap(__tmp);
_M_sync(const_cast<char_type*>(_M_string.data()),
this->gptr() - this->eback(), this->pptr() - this->pbase());
}
else
*this->pptr() = __conv;
this->pbump(1);
return __c;
}
template <class _CharT, class _Traits, class _Alloc>
typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
basic_stringbuf<_CharT, _Traits, _Alloc>::
underflow()
{
int_type __ret = traits_type::eof();
const bool __testin = this->_M_mode & ios_base::in;
if (__testin)
{
// Update egptr() to match the actual string end.
_M_update_egptr();
if (this->gptr() < this->egptr())
__ret = traits_type::to_int_type(*this->gptr());
}
return __ret;
}
template <class _CharT, class _Traits, class _Alloc>
typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
basic_stringbuf<_CharT, _Traits, _Alloc>::
seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
{
pos_type __ret = pos_type(off_type(-1));
bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
const bool __testboth = __testin && __testout && __way != ios_base::cur;
__testin &= !(__mode & ios_base::out);
__testout &= !(__mode & ios_base::in);
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 453. basic_stringbuf::seekoff need not always fail for an empty stream.
const char_type* __beg = __testin ? this->eback() : this->pbase();
if ((__beg || !__off) && (__testin || __testout || __testboth))
{
_M_update_egptr();
off_type __newoffi = __off;
off_type __newoffo = __newoffi;
if (__way == ios_base::cur)
{
__newoffi += this->gptr() - __beg;
__newoffo += this->pptr() - __beg;
}
else if (__way == ios_base::end)
__newoffo = __newoffi += this->egptr() - __beg;
if ((__testin || __testboth)
&& __newoffi >= 0
&& this->egptr() - __beg >= __newoffi)
{
this->setg(this->eback(), this->eback() + __newoffi,
this->egptr());
__ret = pos_type(__newoffi);
}
if ((__testout || __testboth)
&& __newoffo >= 0
&& this->egptr() - __beg >= __newoffo)
{
_M_pbump(this->pbase(), this->epptr(), __newoffo);
__ret = pos_type(__newoffo);
}
}
return __ret;
}
template <class _CharT, class _Traits, class _Alloc>
typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
basic_stringbuf<_CharT, _Traits, _Alloc>::
seekpos(pos_type __sp, ios_base::openmode __mode)
{
pos_type __ret = pos_type(off_type(-1));
const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
const char_type* __beg = __testin ? this->eback() : this->pbase();
if ((__beg || !off_type(__sp)) && (__testin || __testout))
{
_M_update_egptr();
const off_type __pos(__sp);
const bool __testpos = (0 <= __pos
&& __pos <= this->egptr() - __beg);
if (__testpos)
{
if (__testin)
this->setg(this->eback(), this->eback() + __pos,
this->egptr());
if (__testout)
_M_pbump(this->pbase(), this->epptr(), __pos);
__ret = __sp;
}
}
return __ret;
}
template <class _CharT, class _Traits, class _Alloc>
void
basic_stringbuf<_CharT, _Traits, _Alloc>::
_M_sync(char_type* __base, __size_type __i, __size_type __o)
{
const bool __testin = _M_mode & ios_base::in;
const bool __testout = _M_mode & ios_base::out;
char_type* __endg = __base + _M_string.size();
char_type* __endp = __base + _M_string.capacity();
if (__base != _M_string.data())
{
// setbuf: __i == size of buffer area (_M_string.size() == 0).
__endg += __i;
__i = 0;
__endp = __endg;
}
if (__testin)
this->setg(__base, __base + __i, __endg);
if (__testout)
{
_M_pbump(__base, __endp, __o);
// egptr() always tracks the string end. When !__testin,
// for the correct functioning of the streambuf inlines
// the other get area pointers are identical.
if (!__testin)
this->setg(__endg, __endg, __endg);
}
}
template <class _CharT, class _Traits, class _Alloc>
void
basic_stringbuf<_CharT, _Traits, _Alloc>::
_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off)
{
this->setp(__pbeg, __pend);
while (__off > __gnu_cxx::__numeric_traits<int>::__max)
{
this->pbump(__gnu_cxx::__numeric_traits<int>::__max);
__off -= __gnu_cxx::__numeric_traits<int>::__max;
}
this->pbump(__off);
}
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
extern template class basic_stringbuf<char>;
extern template class basic_istringstream<char>;
extern template class basic_ostringstream<char>;
extern template class basic_stringstream<char>;
#ifdef _GLIBCXX_USE_WCHAR_T
extern template class basic_stringbuf<wchar_t>;
extern template class basic_istringstream<wchar_t>;
extern template class basic_ostringstream<wchar_t>;
extern template class basic_stringstream<wchar_t>;
#endif
#endif
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif
|