stdio_filebuf.h

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00001 // File descriptor layer for filebuf -*- C++ -*- 00002 00003 // Copyright (C) 2002 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 2, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // You should have received a copy of the GNU General Public License along 00017 // with this library; see the file COPYING. If not, write to the Free 00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00019 // USA. 00020 00021 // As a special exception, you may use this file as part of a free software 00022 // library without restriction. Specifically, if other files instantiate 00023 // templates or use macros or inline functions from this file, or you compile 00024 // this file and link it with other files to produce an executable, this 00025 // file does not by itself cause the resulting executable to be covered by 00026 // the GNU General Public License. This exception does not however 00027 // invalidate any other reasons why the executable file might be covered by 00028 // the GNU General Public License. 00029 00034 #ifndef _EXT_STDIO_FILEBUF 00035 #define _EXT_STDIO_FILEBUF 00036 00037 #pragma GCC system_header 00038 #include <fstream> 00039 00040 namespace __gnu_cxx 00041 { 00051 template<typename _CharT, typename _Traits = std::char_traits<_CharT> > 00052 class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits> 00053 { 00054 public: 00055 // Types: 00056 typedef _CharT char_type; 00057 typedef _Traits traits_type; 00058 typedef typename traits_type::int_type int_type; 00059 typedef typename traits_type::pos_type pos_type; 00060 typedef typename traits_type::off_type off_type; 00061 00062 protected: 00063 // Stack-based buffer for unbuffered input. 00064 char_type _M_unbuf[4]; 00065 00066 public: 00077 stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del, 00078 int_type __size); 00079 00090 stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode, 00091 int_type __size = static_cast<int_type>(BUFSIZ)); 00092 00097 virtual 00098 ~stdio_filebuf(); 00099 00108 int 00109 fd() 00110 { return _M_file.fd(); } 00111 }; 00112 00113 template<typename _CharT, typename _Traits> 00114 stdio_filebuf<_CharT, _Traits>::~stdio_filebuf() 00115 { } 00116 00117 template<typename _CharT, typename _Traits> 00118 stdio_filebuf<_CharT, _Traits>:: 00119 stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del, 00120 int_type __size) 00121 { 00122 _M_file.sys_open(__fd, __mode, __del); 00123 if (this->is_open()) 00124 { 00125 _M_mode = __mode; 00126 if (__size > 0 && __size < 4) 00127 { 00128 // Specify unbuffered. 00129 _M_buf = _M_unbuf; 00130 _M_buf_size = __size; 00131 _M_buf_size_opt = 0; 00132 } 00133 else 00134 { 00135 _M_buf_size_opt = __size; 00136 _M_allocate_internal_buffer(); 00137 } 00138 _M_set_indeterminate(); 00139 } 00140 } 00141 00142 template<typename _CharT, typename _Traits> 00143 stdio_filebuf<_CharT, _Traits>:: 00144 stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode, 00145 int_type __size) 00146 { 00147 _M_file.sys_open(__f, __mode); 00148 if (this->is_open()) 00149 { 00150 _M_mode = __mode; 00151 if (__size > 0 && __size < 4) 00152 { 00153 // Specify unbuffered. 00154 _M_buf = _M_unbuf; 00155 _M_buf_size = __size; 00156 _M_buf_size_opt = 0; 00157 } 00158 else 00159 { 00160 _M_buf_size_opt = __size; 00161 _M_allocate_internal_buffer(); 00162 } 00163 _M_set_indeterminate(); 00164 } 00165 } 00166 } // namespace __gnu_cxx 00167 00168 #endif /* _EXT_STDIO_FILEBUF */

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