1 // Stream buffer classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
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_cur < _M_in_end)
54 char_type __c = *(this->gptr());
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 bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;
70 if (!__testpos || !traits_type::eq(__c, this->gptr()[-1]))
71 __ret = this->pbackfail(traits_type::to_int_type(__c));
75 __ret = traits_type::to_int_type(*this->gptr());
80 template<typename _CharT, typename _Traits>
81 typename basic_streambuf<_CharT, _Traits>::int_type
82 basic_streambuf<_CharT, _Traits>::
86 if (_M_in_cur && _M_in_beg < _M_in_cur)
89 __ret = traits_type::to_int_type(*_M_in_cur);
92 __ret = this->pbackfail();
96 // Don't test against _M_buf + _M_buf_size, because _M_buf reflects
97 // allocated space, and on certain (rare but entirely legal)
98 // situations, there will be no allocated space yet the internal
99 // buffers will still be valid. (This happens if setp is used to set
100 // the internal buffer to say some externally-allocated sequence.)
101 template<typename _CharT, typename _Traits>
102 typename basic_streambuf<_CharT, _Traits>::int_type
103 basic_streambuf<_CharT, _Traits>::
107 if (_M_out_buf_size())
111 __ret = traits_type::to_int_type(__c);
114 __ret = this->overflow(traits_type::to_int_type(__c));
118 template<typename _CharT, typename _Traits>
120 basic_streambuf<_CharT, _Traits>::
121 xsgetn(char_type* __s, streamsize __n)
123 streamsize __ret = 0;
126 size_t __buf_len = _M_in_end - _M_in_cur;
129 size_t __remaining = __n - __ret;
130 size_t __len = std::min(__buf_len, __remaining);
131 traits_type::copy(__s, _M_in_cur, __len);
134 _M_in_cur_move(__len);
139 int_type __c = this->uflow();
140 if (!traits_type::eq_int_type(__c, traits_type::eof()))
142 traits_type::assign(*__s++, traits_type::to_char_type(__c));
152 // Don't test against _M_buf + _M_buf_size, because _M_buf reflects
153 // allocated space, and on certain (rare but entirely legal)
154 // situations, there will be no allocated space yet the internal
155 // buffers will still be valid. (This happens if setp is used to set
156 // the internal buffer to say some externally-allocated sequence.)
157 template<typename _CharT, typename _Traits>
159 basic_streambuf<_CharT, _Traits>::
160 xsputn(const char_type* __s, streamsize __n)
162 streamsize __ret = 0;
165 off_type __buf_len = _M_out_buf_size();
168 off_type __remaining = __n - __ret;
169 off_type __len = std::min(__buf_len, __remaining);
170 traits_type::copy(_M_out_cur, __s, __len);
173 _M_out_cur_move(__len);
178 int_type __c = this->overflow(traits_type::to_int_type(*__s));
179 if (!traits_type::eq_int_type(__c, traits_type::eof()))
191 // Conceivably, this could be used to implement buffer-to-buffer
192 // copies, if this was ever desired in an un-ambiguous way by the
193 // standard. If so, then checks for __ios being zero would be
195 template<typename _CharT, typename _Traits>
197 __copy_streambufs(basic_ios<_CharT, _Traits>& __ios,
198 basic_streambuf<_CharT, _Traits>* __sbin,
199 basic_streambuf<_CharT, _Traits>* __sbout)
201 typedef typename _Traits::int_type int_type;
203 streamsize __ret = 0;
204 streamsize __bufsize = __sbin->in_avail();
208 while (__bufsize != -1)
210 if (__bufsize != 0 && __sbin->gptr() != NULL
211 && __sbin->gptr() + __bufsize <= __sbin->egptr())
213 __xtrct = __sbout->sputn(__sbin->gptr(), __bufsize);
215 __sbin->_M_in_cur_move(__xtrct);
216 if (__xtrct != __bufsize)
222 __sbin->_M_buf_size_opt > 0 ? __sbin->_M_buf_size_opt : 1;
224 static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __size));
225 streamsize __charsread = __sbin->sgetn(__buf, __size);
226 __xtrct = __sbout->sputn(__buf, __charsread);
228 if (__xtrct != __charsread)
231 if (_Traits::eq_int_type(__sbin->sgetc(), _Traits::eof()))
233 __bufsize = __sbin->in_avail();
236 catch(exception& __fail)
238 __ios.setstate(ios_base::failbit);
239 if ((__ios.exceptions() & ios_base::failbit) != 0)
240 __throw_exception_again;
245 // Inhibit implicit instantiations for required instantiations,
246 // which are defined via explicit instantiations elsewhere.
247 // NB: This syntax is a GNU extension.
248 extern template class basic_streambuf<char>;
251 __copy_streambufs(basic_ios<char>&, basic_streambuf<char>*,
252 basic_streambuf<char>*);
254 #ifdef _GLIBCPP_USE_WCHAR_T
255 extern template class basic_streambuf<wchar_t>;
258 __copy_streambufs(basic_ios<wchar_t>&, basic_streambuf<wchar_t>*,
259 basic_streambuf<wchar_t>*);