1 // String based streams -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003, 2004
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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 // ISO C++ 14882: 27.7 String-based streams
36 #define _SSTREAM_TCC 1
38 #pragma GCC system_header
44 template <class _CharT, class _Traits, class _Alloc>
45 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
46 basic_stringbuf<_CharT, _Traits, _Alloc>::
47 pbackfail(int_type __c)
49 int_type __ret = traits_type::eof();
50 if (this->eback() < this->gptr())
52 // Try to put back __c into input sequence in one of three ways.
53 // Order these tests done in is unspecified by the standard.
54 const bool __testeof = traits_type::eq_int_type(__c, __ret);
57 const bool __testeq = traits_type::eq(traits_type::
60 const bool __testout = this->_M_mode & ios_base::out;
61 if (__testeq || __testout)
65 *this->gptr() = traits_type::to_char_type(__c);
72 __ret = traits_type::not_eof(__c);
78 template <class _CharT, class _Traits, class _Alloc>
79 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
80 basic_stringbuf<_CharT, _Traits, _Alloc>::
81 overflow(int_type __c)
83 const bool __testout = this->_M_mode & ios_base::out;
84 if (__builtin_expect(!__testout, false))
85 return traits_type::eof();
87 const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
88 if (__builtin_expect(__testeof, false))
89 return traits_type::not_eof(__c);
91 const __size_type __capacity = _M_string.capacity();
92 const __size_type __max_size = _M_string.max_size();
93 const bool __testput = this->pptr() < this->epptr();
94 if (__builtin_expect(!__testput && __capacity == __max_size, false))
95 return traits_type::eof();
97 // Try to append __c into output sequence in one of two ways.
98 // Order these tests done in is unspecified by the standard.
101 // NB: Start ostringstream buffers at 512 chars. This is an
102 // experimental value (pronounced "arbitrary" in some of the
103 // hipper english-speaking countries), and can be changed to
104 // suit particular needs.
105 // Then, in virtue of DR 169 (TC) we are allowed to grow more
107 const __size_type __opt_len = std::max(__size_type(2 * __capacity),
109 const __size_type __len = std::min(__opt_len, __max_size);
111 __tmp.reserve(__len);
113 __tmp.assign(this->pbase(), this->epptr() - this->pbase());
114 _M_string.swap(__tmp);
115 _M_sync(const_cast<char_type*>(_M_string.data()),
116 this->gptr() - this->eback(), this->pptr() - this->pbase());
118 return this->sputc(traits_type::to_char_type(__c));
121 template <class _CharT, class _Traits, class _Alloc>
122 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
123 basic_stringbuf<_CharT, _Traits, _Alloc>::
126 int_type __ret = traits_type::eof();
127 const bool __testin = this->_M_mode & ios_base::in;
130 // Update egptr() to match the actual string end.
133 if (this->gptr() < this->egptr())
134 __ret = traits_type::to_int_type(*this->gptr());
139 template <class _CharT, class _Traits, class _Alloc>
140 typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
141 basic_stringbuf<_CharT, _Traits, _Alloc>::
142 seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
144 pos_type __ret = pos_type(off_type(-1));
145 bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
146 bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
147 const bool __testboth = __testin && __testout && __way != ios_base::cur;
148 __testin &= !(__mode & ios_base::out);
149 __testout &= !(__mode & ios_base::in);
151 // _GLIBCXX_RESOLVE_LIB_DEFECTS
152 // 453. basic_stringbuf::seekoff need not always fail for an empty stream.
153 const char_type* __beg = __testin ? this->eback() : this->pbase();
154 if ((__beg || !__off) && (__testin || __testout || __testboth))
158 off_type __newoffi = __off;
159 off_type __newoffo = __newoffi;
160 if (__way == ios_base::cur)
162 __newoffi += this->gptr() - __beg;
163 __newoffo += this->pptr() - __beg;
165 else if (__way == ios_base::end)
166 __newoffo = __newoffi += this->egptr() - __beg;
168 if ((__testin || __testboth)
170 && this->egptr() - __beg >= __newoffi)
172 this->gbump((__beg + __newoffi) - this->gptr());
173 __ret = pos_type(__newoffi);
175 if ((__testout || __testboth)
177 && this->egptr() - __beg >= __newoffo)
179 this->pbump((__beg + __newoffo) - this->pptr());
180 __ret = pos_type(__newoffo);
186 template <class _CharT, class _Traits, class _Alloc>
187 typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
188 basic_stringbuf<_CharT, _Traits, _Alloc>::
189 seekpos(pos_type __sp, ios_base::openmode __mode)
191 pos_type __ret = pos_type(off_type(-1));
192 const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
193 const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
195 const char_type* __beg = __testin ? this->eback() : this->pbase();
196 if (__beg && (__testin || __testout))
200 const off_type __pos(__sp);
201 const bool __testpos = 0 <= __pos
202 && __pos <= this->egptr() - __beg;
206 this->gbump((__beg + __pos) - this->gptr());
208 this->pbump((__beg + __pos) - this->pptr());
215 // Inhibit implicit instantiations for required instantiations,
216 // which are defined via explicit instantiations elsewhere.
217 // NB: This syntax is a GNU extension.
218 #if _GLIBCXX_EXTERN_TEMPLATE
219 extern template class basic_stringbuf<char>;
220 extern template class basic_istringstream<char>;
221 extern template class basic_ostringstream<char>;
222 extern template class basic_stringstream<char>;
224 #ifdef _GLIBCXX_USE_WCHAR_T
225 extern template class basic_stringbuf<wchar_t>;
226 extern template class basic_istringstream<wchar_t>;
227 extern template class basic_ostringstream<wchar_t>;
228 extern template class basic_stringstream<wchar_t>;