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1 | // String based streams -*- C++ -*- |
2 | ||
7adcbafe | 3 | // Copyright (C) 1997-2022 Free Software Foundation, Inc. |
725dc051 BK |
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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
725dc051 BK |
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 | ||
748086b7 JJ |
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/>. | |
725dc051 | 24 | |
f910786b | 25 | /** @file bits/sstream.tcc |
0aa06b18 | 26 | * This is an internal header file, included by other library headers. |
f910786b | 27 | * Do not attempt to use it directly. @headername{sstream} |
0aa06b18 BK |
28 | */ |
29 | ||
725dc051 BK |
30 | // |
31 | // ISO C++ 14882: 27.7 String-based streams | |
32 | // | |
33 | ||
3d7c150e BK |
34 | #ifndef _SSTREAM_TCC |
35 | #define _SSTREAM_TCC 1 | |
725dc051 | 36 | |
3b794528 BK |
37 | #pragma GCC system_header |
38 | ||
12ffa228 BK |
39 | namespace std _GLIBCXX_VISIBILITY(default) |
40 | { | |
41 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 42 | |
725dc051 | 43 | template <class _CharT, class _Traits, class _Alloc> |
ed6814f7 | 44 | typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type |
725dc051 BK |
45 | basic_stringbuf<_CharT, _Traits, _Alloc>:: |
46 | pbackfail(int_type __c) | |
47 | { | |
48 | int_type __ret = traits_type::eof(); | |
1b170b55 | 49 | if (this->eback() < this->gptr()) |
725dc051 | 50 | { |
62929dd9 PC |
51 | // Try to put back __c into input sequence in one of three ways. |
52 | // Order these tests done in is unspecified by the standard. | |
abccc4f6 PC |
53 | const bool __testeof = traits_type::eq_int_type(__c, __ret); |
54 | if (!__testeof) | |
55 | { | |
56 | const bool __testeq = traits_type::eq(traits_type:: | |
57 | to_char_type(__c), | |
58 | this->gptr()[-1]); | |
59 | const bool __testout = this->_M_mode & ios_base::out; | |
60 | if (__testeq || __testout) | |
61 | { | |
62 | this->gbump(-1); | |
63 | if (!__testeq) | |
64 | *this->gptr() = traits_type::to_char_type(__c); | |
65 | __ret = __c; | |
66 | } | |
67 | } | |
ca78f36a | 68 | else |
725dc051 | 69 | { |
abccc4f6 PC |
70 | this->gbump(-1); |
71 | __ret = traits_type::not_eof(__c); | |
725dc051 | 72 | } |
725dc051 BK |
73 | } |
74 | return __ret; | |
75 | } | |
ed6814f7 | 76 | |
725dc051 | 77 | template <class _CharT, class _Traits, class _Alloc> |
ed6814f7 | 78 | typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type |
725dc051 BK |
79 | basic_stringbuf<_CharT, _Traits, _Alloc>:: |
80 | overflow(int_type __c) | |
81 | { | |
5e77a357 | 82 | const bool __testout = this->_M_mode & ios_base::out; |
391cd095 PC |
83 | if (__builtin_expect(!__testout, false)) |
84 | return traits_type::eof(); | |
23cac885 | 85 | |
42134429 | 86 | const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof()); |
391cd095 PC |
87 | if (__builtin_expect(__testeof, false)) |
88 | return traits_type::not_eof(__c); | |
89 | ||
9f9000d1 | 90 | const __size_type __capacity = _M_string.capacity(); |
93ef155b JW |
91 | |
92 | #if _GLIBCXX_USE_CXX11_ABI | |
2232b613 | 93 | if (size_t(this->epptr() - this->pbase()) < __capacity) |
93ef155b JW |
94 | { |
95 | // There is additional capacity in _M_string that can be used. | |
96 | char_type* __base = const_cast<char_type*>(_M_string.data()); | |
97 | _M_pbump(__base, __base + __capacity, this->pptr() - this->pbase()); | |
98 | if (_M_mode & ios_base::in) | |
99 | { | |
100 | const __size_type __nget = this->gptr() - this->eback(); | |
101 | const __size_type __eget = this->egptr() - this->eback(); | |
102 | this->setg(__base, __base + __nget, __base + __eget + 1); | |
103 | } | |
104 | *this->pptr() = traits_type::to_char_type(__c); | |
105 | this->pbump(1); | |
106 | return __c; | |
107 | } | |
108 | #endif | |
109 | ||
9f9000d1 | 110 | const __size_type __max_size = _M_string.max_size(); |
1b170b55 | 111 | const bool __testput = this->pptr() < this->epptr(); |
9f9000d1 | 112 | if (__builtin_expect(!__testput && __capacity == __max_size, false)) |
391cd095 | 113 | return traits_type::eof(); |
725dc051 BK |
114 | |
115 | // Try to append __c into output sequence in one of two ways. | |
116 | // Order these tests done in is unspecified by the standard. | |
10d9600d | 117 | const char_type __conv = traits_type::to_char_type(__c); |
23cac885 | 118 | if (!__testput) |
725dc051 | 119 | { |
10d9600d | 120 | // NB: Start ostringstream buffers at 512 chars. This is an |
9f9000d1 | 121 | // experimental value (pronounced "arbitrary" in some of the |
28dac70a | 122 | // hipper English-speaking countries), and can be changed to |
9f9000d1 | 123 | // suit particular needs. |
10d9600d PC |
124 | // |
125 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
126 | // 169. Bad efficiency of overflow() mandated | |
127 | // 432. stringbuf::overflow() makes only one write position | |
128 | // available | |
9f9000d1 PC |
129 | const __size_type __opt_len = std::max(__size_type(2 * __capacity), |
130 | __size_type(512)); | |
131 | const __size_type __len = std::min(__opt_len, __max_size); | |
387c17d3 | 132 | __string_type __tmp(_M_string.get_allocator()); |
74843551 | 133 | __tmp.reserve(__len); |
dbb8bfe8 PC |
134 | if (this->pbase()) |
135 | __tmp.assign(this->pbase(), this->epptr() - this->pbase()); | |
10d9600d | 136 | __tmp.push_back(__conv); |
74843551 | 137 | _M_string.swap(__tmp); |
655d7821 | 138 | _M_sync(const_cast<char_type*>(_M_string.data()), |
42134429 | 139 | this->gptr() - this->eback(), this->pptr() - this->pbase()); |
725dc051 | 140 | } |
10d9600d PC |
141 | else |
142 | *this->pptr() = __conv; | |
143 | this->pbump(1); | |
144 | return __c; | |
725dc051 BK |
145 | } |
146 | ||
1b170b55 | 147 | template <class _CharT, class _Traits, class _Alloc> |
ed6814f7 | 148 | typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type |
1b170b55 | 149 | basic_stringbuf<_CharT, _Traits, _Alloc>:: |
cd16e04b | 150 | underflow() |
1b170b55 PC |
151 | { |
152 | int_type __ret = traits_type::eof(); | |
153 | const bool __testin = this->_M_mode & ios_base::in; | |
154 | if (__testin) | |
155 | { | |
156 | // Update egptr() to match the actual string end. | |
157 | _M_update_egptr(); | |
983de0da | 158 | |
1b170b55 | 159 | if (this->gptr() < this->egptr()) |
cd16e04b | 160 | __ret = traits_type::to_int_type(*this->gptr()); |
1b170b55 PC |
161 | } |
162 | return __ret; | |
163 | } | |
164 | ||
725dc051 | 165 | template <class _CharT, class _Traits, class _Alloc> |
31bfa177 | 166 | typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type |
725dc051 BK |
167 | basic_stringbuf<_CharT, _Traits, _Alloc>:: |
168 | seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode) | |
169 | { | |
ed6814f7 | 170 | pos_type __ret = pos_type(off_type(-1)); |
8fbc5ae7 MM |
171 | bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; |
172 | bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; | |
5e77a357 | 173 | const bool __testboth = __testin && __testout && __way != ios_base::cur; |
b988dfc5 BK |
174 | __testin &= !(__mode & ios_base::out); |
175 | __testout &= !(__mode & ios_base::in); | |
176 | ||
9c9e97bd PC |
177 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
178 | // 453. basic_stringbuf::seekoff need not always fail for an empty stream. | |
983de0da | 179 | const char_type* __beg = __testin ? this->eback() : this->pbase(); |
9c9e97bd | 180 | if ((__beg || !__off) && (__testin || __testout || __testboth)) |
725dc051 | 181 | { |
1b170b55 | 182 | _M_update_egptr(); |
725dc051 | 183 | |
0a162bde PC |
184 | off_type __newoffi = __off; |
185 | off_type __newoffo = __newoffi; | |
725dc051 BK |
186 | if (__way == ios_base::cur) |
187 | { | |
0a162bde PC |
188 | __newoffi += this->gptr() - __beg; |
189 | __newoffo += this->pptr() - __beg; | |
725dc051 BK |
190 | } |
191 | else if (__way == ios_base::end) | |
0a162bde | 192 | __newoffo = __newoffi += this->egptr() - __beg; |
725dc051 | 193 | |
b988dfc5 | 194 | if ((__testin || __testboth) |
0a162bde PC |
195 | && __newoffi >= 0 |
196 | && this->egptr() - __beg >= __newoffi) | |
725dc051 | 197 | { |
1139a735 PC |
198 | this->setg(this->eback(), this->eback() + __newoffi, |
199 | this->egptr()); | |
725dc051 BK |
200 | __ret = pos_type(__newoffi); |
201 | } | |
b988dfc5 | 202 | if ((__testout || __testboth) |
0a162bde PC |
203 | && __newoffo >= 0 |
204 | && this->egptr() - __beg >= __newoffo) | |
725dc051 | 205 | { |
1139a735 | 206 | _M_pbump(this->pbase(), this->epptr(), __newoffo); |
725dc051 BK |
207 | __ret = pos_type(__newoffo); |
208 | } | |
209 | } | |
210 | return __ret; | |
211 | } | |
212 | ||
213 | template <class _CharT, class _Traits, class _Alloc> | |
31bfa177 | 214 | typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type |
725dc051 BK |
215 | basic_stringbuf<_CharT, _Traits, _Alloc>:: |
216 | seekpos(pos_type __sp, ios_base::openmode __mode) | |
217 | { | |
ed6814f7 | 218 | pos_type __ret = pos_type(off_type(-1)); |
983de0da PC |
219 | const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; |
220 | const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; | |
ed6814f7 | 221 | |
983de0da | 222 | const char_type* __beg = __testin ? this->eback() : this->pbase(); |
bcf0248a | 223 | if ((__beg || !off_type(__sp)) && (__testin || __testout)) |
983de0da | 224 | { |
1b170b55 PC |
225 | _M_update_egptr(); |
226 | ||
f67b6b7a | 227 | const off_type __pos(__sp); |
10d9600d PC |
228 | const bool __testpos = (0 <= __pos |
229 | && __pos <= this->egptr() - __beg); | |
f67b6b7a | 230 | if (__testpos) |
b988dfc5 | 231 | { |
1b170b55 | 232 | if (__testin) |
1139a735 PC |
233 | this->setg(this->eback(), this->eback() + __pos, |
234 | this->egptr()); | |
1b170b55 | 235 | if (__testout) |
1139a735 | 236 | _M_pbump(this->pbase(), this->epptr(), __pos); |
9d7bc6de | 237 | __ret = __sp; |
b988dfc5 | 238 | } |
725dc051 | 239 | } |
725dc051 BK |
240 | return __ret; |
241 | } | |
a32e3c09 | 242 | |
10d9600d PC |
243 | template <class _CharT, class _Traits, class _Alloc> |
244 | void | |
245 | basic_stringbuf<_CharT, _Traits, _Alloc>:: | |
246 | _M_sync(char_type* __base, __size_type __i, __size_type __o) | |
247 | { | |
248 | const bool __testin = _M_mode & ios_base::in; | |
249 | const bool __testout = _M_mode & ios_base::out; | |
62448787 PC |
250 | char_type* __endg = __base + _M_string.size(); |
251 | char_type* __endp = __base + _M_string.capacity(); | |
252 | ||
253 | if (__base != _M_string.data()) | |
254 | { | |
255 | // setbuf: __i == size of buffer area (_M_string.size() == 0). | |
256 | __endg += __i; | |
257 | __i = 0; | |
258 | __endp = __endg; | |
259 | } | |
260 | ||
10d9600d | 261 | if (__testin) |
62448787 | 262 | this->setg(__base, __base + __i, __endg); |
10d9600d PC |
263 | if (__testout) |
264 | { | |
1139a735 | 265 | _M_pbump(__base, __endp, __o); |
10d9600d PC |
266 | // egptr() always tracks the string end. When !__testin, |
267 | // for the correct functioning of the streambuf inlines | |
268 | // the other get area pointers are identical. | |
269 | if (!__testin) | |
62448787 | 270 | this->setg(__endg, __endg, __endg); |
10d9600d PC |
271 | } |
272 | } | |
273 | ||
1139a735 PC |
274 | template <class _CharT, class _Traits, class _Alloc> |
275 | void | |
276 | basic_stringbuf<_CharT, _Traits, _Alloc>:: | |
277 | _M_pbump(char_type* __pbeg, char_type* __pend, off_type __off) | |
278 | { | |
279 | this->setp(__pbeg, __pend); | |
280 | while (__off > __gnu_cxx::__numeric_traits<int>::__max) | |
281 | { | |
282 | this->pbump(__gnu_cxx::__numeric_traits<int>::__max); | |
283 | __off -= __gnu_cxx::__numeric_traits<int>::__max; | |
284 | } | |
285 | this->pbump(__off); | |
286 | } | |
287 | ||
a32e3c09 | 288 | // Inhibit implicit instantiations for required instantiations, |
ed6814f7 | 289 | // which are defined via explicit instantiations elsewhere. |
51b6facb | 290 | #if _GLIBCXX_EXTERN_TEMPLATE |
a32e3c09 | 291 | extern template class basic_stringbuf<char>; |
a32e3c09 | 292 | extern template class basic_istringstream<char>; |
a32e3c09 | 293 | extern template class basic_ostringstream<char>; |
a32e3c09 | 294 | extern template class basic_stringstream<char>; |
5112ae3a | 295 | |
3d7c150e | 296 | #ifdef _GLIBCXX_USE_WCHAR_T |
5112ae3a BK |
297 | extern template class basic_stringbuf<wchar_t>; |
298 | extern template class basic_istringstream<wchar_t>; | |
299 | extern template class basic_ostringstream<wchar_t>; | |
a32e3c09 | 300 | extern template class basic_stringstream<wchar_t>; |
5112ae3a | 301 | #endif |
51b6facb | 302 | #endif |
3cbc7af0 | 303 | |
12ffa228 | 304 | _GLIBCXX_END_NAMESPACE_VERSION |
ed4f96af | 305 | } // namespace std |
725dc051 | 306 | |
6f48900c | 307 | #endif |