1 // Stream buffer classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 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: 27.5 Stream buffers
35 #ifndef _CPP_BITS_STREAMBUF_TCC
36 #define _CPP_BITS_STREAMBUF_TCC 1
38 #pragma GCC system_header
42 template<typename _CharT, typename _Traits>
44 basic_streambuf<_CharT, _Traits>::_S_pback_size;
46 template<typename _CharT, typename _Traits>
47 typename basic_streambuf<_CharT, _Traits>::int_type
48 basic_streambuf<_CharT, _Traits>::
52 if (_M_in_cur < _M_in_end)
54 char_type __c = *this->_M_in_cur;
56 __ret = traits_type::to_int_type(__c);
59 __ret = this->uflow();
63 template<typename _CharT, typename _Traits>
64 typename basic_streambuf<_CharT, _Traits>::int_type
65 basic_streambuf<_CharT, _Traits>::
66 sputbackc(char_type __c)
69 const bool __testpos = _M_in_beg < _M_in_cur;
70 if (!__testpos || !traits_type::eq(__c, this->_M_in_cur[-1]))
71 __ret = this->pbackfail(traits_type::to_int_type(__c));
75 __ret = traits_type::to_int_type(*this->_M_in_cur);
80 template<typename _CharT, typename _Traits>
81 typename basic_streambuf<_CharT, _Traits>::int_type
82 basic_streambuf<_CharT, _Traits>::
86 if (_M_in_beg < _M_in_cur)
89 __ret = traits_type::to_int_type(*_M_in_cur);
92 __ret = this->pbackfail();
96 template<typename _CharT, typename _Traits>
97 typename basic_streambuf<_CharT, _Traits>::int_type
98 basic_streambuf<_CharT, _Traits>::
102 if (_M_out_cur < _M_out_end)
106 __ret = traits_type::to_int_type(__c);
109 __ret = this->overflow(traits_type::to_int_type(__c));
113 template<typename _CharT, typename _Traits>
115 basic_streambuf<_CharT, _Traits>::
116 xsgetn(char_type* __s, streamsize __n)
118 streamsize __ret = 0;
121 size_t __buf_len = _M_in_end - _M_in_cur;
124 size_t __remaining = __n - __ret;
125 size_t __len = std::min(__buf_len, __remaining);
126 traits_type::copy(__s, _M_in_cur, __len);
129 _M_in_cur_move(__len);
134 int_type __c = this->uflow();
135 if (!traits_type::eq_int_type(__c, traits_type::eof()))
137 traits_type::assign(*__s++, traits_type::to_char_type(__c));
147 template<typename _CharT, typename _Traits>
149 basic_streambuf<_CharT, _Traits>::
150 xsputn(const char_type* __s, streamsize __n)
152 streamsize __ret = 0;
155 off_type __buf_len = _M_out_end - _M_out_cur;
158 off_type __remaining = __n - __ret;
159 off_type __len = std::min(__buf_len, __remaining);
160 traits_type::copy(_M_out_cur, __s, __len);
163 _M_out_cur_move(__len);
168 int_type __c = this->overflow(traits_type::to_int_type(*__s));
169 if (!traits_type::eq_int_type(__c, traits_type::eof()))
181 // Conceivably, this could be used to implement buffer-to-buffer
182 // copies, if this was ever desired in an un-ambiguous way by the
183 // standard. If so, then checks for __ios being zero would be
185 template<typename _CharT, typename _Traits>
187 __copy_streambufs(basic_ios<_CharT, _Traits>& __ios,
188 basic_streambuf<_CharT, _Traits>* __sbin,
189 basic_streambuf<_CharT, _Traits>* __sbout)
191 typedef typename _Traits::int_type int_type;
192 typedef typename _Traits::off_type off_type;
194 streamsize __ret = 0;
195 streamsize __in_avail = __sbin->in_avail();
197 const off_type __buf_size =
198 __sbin->_M_buf_size > 0 ? __sbin->_M_buf_size : 1;
202 while (__in_avail != -1)
204 if (__in_avail != 0 && __sbin->_M_in_cur
205 && __sbin->_M_in_cur + __in_avail <= __sbin->_M_in_end)
207 __xtrct = __sbout->sputn(__sbin->_M_in_cur, __in_avail);
209 __sbin->_M_in_cur_move(__xtrct);
210 if (__xtrct != __in_avail)
215 streamsize __charsread;
216 const streamsize __size =
217 std::min(__buf_size, off_type(__sbout->_M_out_end -
218 __sbout->_M_out_cur));
222 static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
224 // Since the next sputn cannot fail sgetn can be
226 __charsread = __sbin->sgetn(__buf, __size);
227 __xtrct = __sbout->sputn(__buf, __charsread);
231 __xtrct = __charsread = 0;
232 int_type __c = __sbin->sgetc();
233 while (!_Traits::eq_int_type(__c, _Traits::eof()))
236 if (_Traits::eq_int_type(__sbout->sputc(_Traits::to_char_type(__c)),
240 __c = __sbin->snextc();
244 if (__xtrct != __charsread)
247 if (_Traits::eq_int_type(__sbin->sgetc(), _Traits::eof()))
249 __in_avail = __sbin->in_avail();
252 catch(exception& __fail)
254 __ios.setstate(ios_base::failbit);
255 if ((__ios.exceptions() & ios_base::failbit) != 0)
256 __throw_exception_again;
261 // Inhibit implicit instantiations for required instantiations,
262 // which are defined via explicit instantiations elsewhere.
263 // NB: This syntax is a GNU extension.
264 #if _GLIBCPP_EXTERN_TEMPLATE
265 extern template class basic_streambuf<char>;
268 __copy_streambufs(basic_ios<char>&, basic_streambuf<char>*,
269 basic_streambuf<char>*);
271 #ifdef _GLIBCPP_USE_WCHAR_T
272 extern template class basic_streambuf<wchar_t>;
275 __copy_streambufs(basic_ios<wchar_t>&, basic_streambuf<wchar_t>*,
276 basic_streambuf<wchar_t>*);