1 // String based streams -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003
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 const bool __testeof = traits_type::eq_int_type(__c, __ret);
52 if (this->eback() < this->gptr())
54 const bool __testeq = traits_type::eq(traits_type::to_char_type(__c),
58 // Try to put back __c into input sequence in one of three ways.
59 // Order these tests done in is unspecified by the standard.
60 if (!__testeof && __testeq)
63 __ret = traits_type::not_eof(__c);
66 *this->gptr() = traits_type::to_char_type(__c);
73 template <class _CharT, class _Traits, class _Alloc>
74 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
75 basic_stringbuf<_CharT, _Traits, _Alloc>::
76 overflow(int_type __c)
78 const bool __testout = this->_M_mode & ios_base::out;
79 if (__builtin_expect(!__testout, false))
80 return traits_type::eof();
82 const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
83 if (__builtin_expect(__testeof, false))
84 return traits_type::not_eof(__c);
86 // NB: Start ostringstream buffers at 512 chars. This is an
87 // experimental value (pronounced "arbitrary" in some of the
88 // hipper english-speaking countries), and can be changed to
89 // suit particular needs.
90 const __size_type __len = std::max(__size_type(_M_string.capacity() + 1),
92 const bool __testput = this->pptr() < this->epptr();
93 if (__builtin_expect(!__testput && __len > _M_string.max_size(), false))
94 return traits_type::eof();
96 // Try to append __c into output sequence in one of two ways.
97 // Order these tests done in is unspecified by the standard.
100 // In virtue of DR 169 (TC) we are allowed to grow more than
101 // one char. That's easy to implement thanks to the exponential
102 // growth policy builtin into basic_string.
104 __tmp.reserve(__len);
105 __tmp.assign(_M_string.data(), this->epptr() - this->pbase());
106 _M_string.swap(__tmp);
107 _M_sync(const_cast<char_type*>(_M_string.data()),
108 this->gptr() - this->eback(), this->pptr() - this->pbase());
110 return this->sputc(traits_type::to_char_type(__c));
113 template <class _CharT, class _Traits, class _Alloc>
114 typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
115 basic_stringbuf<_CharT, _Traits, _Alloc>::
118 int_type __ret = traits_type::eof();
119 const bool __testin = this->_M_mode & ios_base::in;
122 // Update egptr() to match the actual string end.
124 if (this->gptr() < this->egptr())
125 __ret = traits_type::to_int_type(*this->gptr());
130 template <class _CharT, class _Traits, class _Alloc>
131 typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
132 basic_stringbuf<_CharT, _Traits, _Alloc>::
133 seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
135 pos_type __ret = pos_type(off_type(-1));
136 bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
137 bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
138 const bool __testboth = __testin && __testout && __way != ios_base::cur;
139 __testin &= !(__mode & ios_base::out);
140 __testout &= !(__mode & ios_base::in);
142 if (_M_string.capacity() && (__testin || __testout || __testboth))
144 char_type* __beg = __testin ? this->eback() : this->pbase();
148 off_type __newoffi = 0;
149 off_type __newoffo = 0;
150 if (__way == ios_base::cur)
152 __newoffi = this->gptr() - __beg;
153 __newoffo = this->pptr() - __beg;
155 else if (__way == ios_base::end)
156 __newoffo = __newoffi = this->egptr() - __beg;
158 if ((__testin || __testboth)
159 && __newoffi + __off >= 0
160 && this->egptr() - __beg >= __newoffi + __off)
162 this->gbump((__beg + __newoffi + __off) - this->gptr());
163 __ret = pos_type(__newoffi);
165 if ((__testout || __testboth)
166 && __newoffo + __off >= 0
167 && this->egptr() - __beg >= __newoffo + __off)
169 this->pbump((__beg + __newoffo + __off) - this->pptr());
170 __ret = pos_type(__newoffo);
176 template <class _CharT, class _Traits, class _Alloc>
177 typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
178 basic_stringbuf<_CharT, _Traits, _Alloc>::
179 seekpos(pos_type __sp, ios_base::openmode __mode)
181 pos_type __ret = pos_type(off_type(-1));
182 if (_M_string.capacity())
184 off_type __pos (__sp);
185 const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
186 const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
187 char_type* __beg = __testin ? this->eback() : this->pbase();
191 const bool __testpos = 0 <= __pos
192 && __pos <= this->egptr() - __beg;
193 if ((__testin || __testout) && __testpos)
196 this->gbump((__beg + __pos) - this->gptr());
198 this->pbump((__beg + __pos) - this->pptr());
199 __ret = pos_type(off_type(__pos));
205 // Inhibit implicit instantiations for required instantiations,
206 // which are defined via explicit instantiations elsewhere.
207 // NB: This syntax is a GNU extension.
208 #if _GLIBCXX_EXTERN_TEMPLATE
209 extern template class basic_stringbuf<char>;
210 extern template class basic_istringstream<char>;
211 extern template class basic_ostringstream<char>;
212 extern template class basic_stringstream<char>;
214 #ifdef _GLIBCXX_USE_WCHAR_T
215 extern template class basic_stringbuf<wchar_t>;
216 extern template class basic_istringstream<wchar_t>;
217 extern template class basic_ostringstream<wchar_t>;
218 extern template class basic_stringstream<wchar_t>;