streambuf.tcc revision 169692
1// Stream buffer classes -*- C++ -*- 2 3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 4// Free Software Foundation, Inc. 5// 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) 10// any later version. 11 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. 16 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, 20// USA. 21 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. 30 31/** @file streambuf.tcc 32 * This is an internal header file, included by other library headers. 33 * You should not attempt to use it directly. 34 */ 35 36// 37// ISO C++ 14882: 27.5 Stream buffers 38// 39 40#ifndef _STREAMBUF_TCC 41#define _STREAMBUF_TCC 1 42 43#pragma GCC system_header 44 45_GLIBCXX_BEGIN_NAMESPACE(std) 46 47 template<typename _CharT, typename _Traits> 48 streamsize 49 basic_streambuf<_CharT, _Traits>:: 50 xsgetn(char_type* __s, streamsize __n) 51 { 52 streamsize __ret = 0; 53 while (__ret < __n) 54 { 55 const streamsize __buf_len = this->egptr() - this->gptr(); 56 if (__buf_len) 57 { 58 const streamsize __remaining = __n - __ret; 59 const streamsize __len = std::min(__buf_len, __remaining); 60 traits_type::copy(__s, this->gptr(), __len); 61 __ret += __len; 62 __s += __len; 63 this->gbump(__len); 64 } 65 66 if (__ret < __n) 67 { 68 const int_type __c = this->uflow(); 69 if (!traits_type::eq_int_type(__c, traits_type::eof())) 70 { 71 traits_type::assign(*__s++, traits_type::to_char_type(__c)); 72 ++__ret; 73 } 74 else 75 break; 76 } 77 } 78 return __ret; 79 } 80 81 template<typename _CharT, typename _Traits> 82 streamsize 83 basic_streambuf<_CharT, _Traits>:: 84 xsputn(const char_type* __s, streamsize __n) 85 { 86 streamsize __ret = 0; 87 while (__ret < __n) 88 { 89 const streamsize __buf_len = this->epptr() - this->pptr(); 90 if (__buf_len) 91 { 92 const streamsize __remaining = __n - __ret; 93 const streamsize __len = std::min(__buf_len, __remaining); 94 traits_type::copy(this->pptr(), __s, __len); 95 __ret += __len; 96 __s += __len; 97 this->pbump(__len); 98 } 99 100 if (__ret < __n) 101 { 102 int_type __c = this->overflow(traits_type::to_int_type(*__s)); 103 if (!traits_type::eq_int_type(__c, traits_type::eof())) 104 { 105 ++__ret; 106 ++__s; 107 } 108 else 109 break; 110 } 111 } 112 return __ret; 113 } 114 115 // Conceivably, this could be used to implement buffer-to-buffer 116 // copies, if this was ever desired in an un-ambiguous way by the 117 // standard. 118 template<typename _CharT, typename _Traits> 119 streamsize 120 __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin, 121 basic_streambuf<_CharT, _Traits>* __sbout, 122 bool& __ineof) 123 { 124 streamsize __ret = 0; 125 __ineof = true; 126 typename _Traits::int_type __c = __sbin->sgetc(); 127 while (!_Traits::eq_int_type(__c, _Traits::eof())) 128 { 129 __c = __sbout->sputc(_Traits::to_char_type(__c)); 130 if (_Traits::eq_int_type(__c, _Traits::eof())) 131 { 132 __ineof = false; 133 break; 134 } 135 ++__ret; 136 __c = __sbin->snextc(); 137 } 138 return __ret; 139 } 140 141 template<typename _CharT, typename _Traits> 142 inline streamsize 143 __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin, 144 basic_streambuf<_CharT, _Traits>* __sbout) 145 { 146 bool __ineof; 147 return __copy_streambufs_eof(__sbin, __sbout, __ineof); 148 } 149 150 // Inhibit implicit instantiations for required instantiations, 151 // which are defined via explicit instantiations elsewhere. 152 // NB: This syntax is a GNU extension. 153#if _GLIBCXX_EXTERN_TEMPLATE 154 extern template class basic_streambuf<char>; 155 extern template 156 streamsize 157 __copy_streambufs(basic_streambuf<char>*, 158 basic_streambuf<char>*); 159 extern template 160 streamsize 161 __copy_streambufs_eof(basic_streambuf<char>*, 162 basic_streambuf<char>*, bool&); 163 164#ifdef _GLIBCXX_USE_WCHAR_T 165 extern template class basic_streambuf<wchar_t>; 166 extern template 167 streamsize 168 __copy_streambufs(basic_streambuf<wchar_t>*, 169 basic_streambuf<wchar_t>*); 170 extern template 171 streamsize 172 __copy_streambufs_eof(basic_streambuf<wchar_t>*, 173 basic_streambuf<wchar_t>*, bool&); 174#endif 175#endif 176 177_GLIBCXX_END_NAMESPACE 178 179#endif 180