1 // String based streams -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
4 // Free Software Foundation, Inc.
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
9 // Free Software Foundation; either version 2, or (at your option)
12 // This library is distributed in the hope that it will be useful,
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.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING. If not, write to the Free
19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
32 * This is an internal header file, included by other library headers.
33 * You should not attempt to use it directly.
37 // ISO C++ 14882: 27.7 String-based streams
41 #define _SSTREAM_TCC 1
43 #pragma GCC system_header
47 _GLIBCXX_BEGIN_NAMESPACE(std)
49 template <class _CharT, class _Traits, class _Alloc>
50 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
51 basic_stringbuf<_CharT, _Traits, _Alloc>::
52 pbackfail(int_type __c)
54 int_type __ret = traits_type::eof();
55 if (this->eback() < this->gptr())
57 // Try to put back __c into input sequence in one of three ways.
58 // Order these tests done in is unspecified by the standard.
59 const bool __testeof = traits_type::eq_int_type(__c, __ret);
62 const bool __testeq = traits_type::eq(traits_type::
65 const bool __testout = this->_M_mode & ios_base::out;
66 if (__testeq || __testout)
70 *this->gptr() = traits_type::to_char_type(__c);
77 __ret = traits_type::not_eof(__c);
83 template <class _CharT, class _Traits, class _Alloc>
84 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
85 basic_stringbuf<_CharT, _Traits, _Alloc>::
86 overflow(int_type __c)
88 const bool __testout = this->_M_mode & ios_base::out;
89 if (__builtin_expect(!__testout, false))
90 return traits_type::eof();
92 const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
93 if (__builtin_expect(__testeof, false))
94 return traits_type::not_eof(__c);
96 const __size_type __capacity = _M_string.capacity();
97 const __size_type __max_size = _M_string.max_size();
98 const bool __testput = this->pptr() < this->epptr();
99 if (__builtin_expect(!__testput && __capacity == __max_size, false))
100 return traits_type::eof();
102 // Try to append __c into output sequence in one of two ways.
103 // Order these tests done in is unspecified by the standard.
104 const char_type __conv = traits_type::to_char_type(__c);
107 // NB: Start ostringstream buffers at 512 chars. This is an
108 // experimental value (pronounced "arbitrary" in some of the
109 // hipper english-speaking countries), and can be changed to
110 // suit particular needs.
112 // _GLIBCXX_RESOLVE_LIB_DEFECTS
113 // 169. Bad efficiency of overflow() mandated
114 // 432. stringbuf::overflow() makes only one write position
116 const __size_type __opt_len = std::max(__size_type(2 * __capacity),
118 const __size_type __len = std::min(__opt_len, __max_size);
120 __tmp.reserve(__len);
122 __tmp.assign(this->pbase(), this->epptr() - this->pbase());
123 __tmp.push_back(__conv);
124 _M_string.swap(__tmp);
125 _M_sync(const_cast<char_type*>(_M_string.data()),
126 this->gptr() - this->eback(), this->pptr() - this->pbase());
129 *this->pptr() = __conv;
134 template <class _CharT, class _Traits, class _Alloc>
135 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
136 basic_stringbuf<_CharT, _Traits, _Alloc>::
139 int_type __ret = traits_type::eof();
140 const bool __testin = this->_M_mode & ios_base::in;
143 // Update egptr() to match the actual string end.
146 if (this->gptr() < this->egptr())
147 __ret = traits_type::to_int_type(*this->gptr());
152 template <class _CharT, class _Traits, class _Alloc>
153 typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
154 basic_stringbuf<_CharT, _Traits, _Alloc>::
155 seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
157 pos_type __ret = pos_type(off_type(-1));
158 bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
159 bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
160 const bool __testboth = __testin && __testout && __way != ios_base::cur;
161 __testin &= !(__mode & ios_base::out);
162 __testout &= !(__mode & ios_base::in);
164 // _GLIBCXX_RESOLVE_LIB_DEFECTS
165 // 453. basic_stringbuf::seekoff need not always fail for an empty stream.
166 const char_type* __beg = __testin ? this->eback() : this->pbase();
167 if ((__beg || !__off) && (__testin || __testout || __testboth))
171 off_type __newoffi = __off;
172 off_type __newoffo = __newoffi;
173 if (__way == ios_base::cur)
175 __newoffi += this->gptr() - __beg;
176 __newoffo += this->pptr() - __beg;
178 else if (__way == ios_base::end)
179 __newoffo = __newoffi += this->egptr() - __beg;
181 if ((__testin || __testboth)
183 && this->egptr() - __beg >= __newoffi)
185 this->gbump((__beg + __newoffi) - this->gptr());
186 __ret = pos_type(__newoffi);
188 if ((__testout || __testboth)
190 && this->egptr() - __beg >= __newoffo)
192 this->pbump((__beg + __newoffo) - this->pptr());
193 __ret = pos_type(__newoffo);
199 template <class _CharT, class _Traits, class _Alloc>
200 typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
201 basic_stringbuf<_CharT, _Traits, _Alloc>::
202 seekpos(pos_type __sp, ios_base::openmode __mode)
204 pos_type __ret = pos_type(off_type(-1));
205 const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
206 const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
208 const char_type* __beg = __testin ? this->eback() : this->pbase();
209 if ((__beg || !off_type(__sp)) && (__testin || __testout))
213 const off_type __pos(__sp);
214 const bool __testpos = (0 <= __pos
215 && __pos <= this->egptr() - __beg);
219 this->gbump((__beg + __pos) - this->gptr());
221 this->pbump((__beg + __pos) - this->pptr());
228 template <class _CharT, class _Traits, class _Alloc>
230 basic_stringbuf<_CharT, _Traits, _Alloc>::
231 _M_sync(char_type* __base, __size_type __i, __size_type __o)
233 const bool __testin = _M_mode & ios_base::in;
234 const bool __testout = _M_mode & ios_base::out;
235 char_type* __endg = __base + _M_string.size();
236 char_type* __endp = __base + _M_string.capacity();
238 if (__base != _M_string.data())
240 // setbuf: __i == size of buffer area (_M_string.size() == 0).
247 this->setg(__base, __base + __i, __endg);
250 this->setp(__base, __endp);
252 // egptr() always tracks the string end. When !__testin,
253 // for the correct functioning of the streambuf inlines
254 // the other get area pointers are identical.
256 this->setg(__endg, __endg, __endg);
260 // Inhibit implicit instantiations for required instantiations,
261 // which are defined via explicit instantiations elsewhere.
262 // NB: This syntax is a GNU extension.
263 #if _GLIBCXX_EXTERN_TEMPLATE
264 extern template class basic_stringbuf<char>;
265 extern template class basic_istringstream<char>;
266 extern template class basic_ostringstream<char>;
267 extern template class basic_stringstream<char>;
269 #ifdef _GLIBCXX_USE_WCHAR_T
270 extern template class basic_stringbuf<wchar_t>;
271 extern template class basic_istringstream<wchar_t>;
272 extern template class basic_ostringstream<wchar_t>;
273 extern template class basic_stringstream<wchar_t>;
277 _GLIBCXX_END_NAMESPACE