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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libstdc++-v3/] [include/] [ext/] [stdio_filebuf.h] - Rev 424
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// File descriptor layer for filebuf -*- C++ -*- // Copyright (C) 2002, 2003, 2004, 2005, 2009, 2010 // Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file ext/stdio_filebuf.h * This file is a GNU extension to the Standard C++ Library. */ #ifndef _STDIO_FILEBUF_H #define _STDIO_FILEBUF_H 1 #pragma GCC system_header #include <fstream> _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) /** * @brief Provides a layer of compatibility for C/POSIX. * @ingroup io * * This GNU extension provides extensions for working with standard C * FILE*'s and POSIX file descriptors. It must be instantiated by the * user with the type of character used in the file stream, e.g., * stdio_filebuf<char>. */ template<typename _CharT, typename _Traits = std::char_traits<_CharT> > class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits> { public: // Types: typedef _CharT char_type; typedef _Traits traits_type; typedef typename traits_type::int_type int_type; typedef typename traits_type::pos_type pos_type; typedef typename traits_type::off_type off_type; typedef std::size_t size_t; public: /** * deferred initialization */ stdio_filebuf() : std::basic_filebuf<_CharT, _Traits>() {} /** * @param fd An open file descriptor. * @param mode Same meaning as in a standard filebuf. * @param size Optimal or preferred size of internal buffer, in chars. * * This constructor associates a file stream buffer with an open * POSIX file descriptor. The file descriptor will be automatically * closed when the stdio_filebuf is closed/destroyed. */ stdio_filebuf(int __fd, std::ios_base::openmode __mode, size_t __size = static_cast<size_t>(BUFSIZ)); /** * @param f An open @c FILE*. * @param mode Same meaning as in a standard filebuf. * @param size Optimal or preferred size of internal buffer, in chars. * Defaults to system's @c BUFSIZ. * * This constructor associates a file stream buffer with an open * C @c FILE*. The @c FILE* will not be automatically closed when the * stdio_filebuf is closed/destroyed. */ stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode, size_t __size = static_cast<size_t>(BUFSIZ)); /** * Closes the external data stream if the file descriptor constructor * was used. */ virtual ~stdio_filebuf(); /** * @return The underlying file descriptor. * * Once associated with an external data stream, this function can be * used to access the underlying POSIX file descriptor. Note that * there is no way for the library to track what you do with the * descriptor, so be careful. */ int fd() { return this->_M_file.fd(); } /** * @return The underlying FILE*. * * This function can be used to access the underlying "C" file pointer. * Note that there is no way for the library to track what you do * with the file, so be careful. */ std::__c_file* file() { return this->_M_file.file(); } }; template<typename _CharT, typename _Traits> stdio_filebuf<_CharT, _Traits>::~stdio_filebuf() { } template<typename _CharT, typename _Traits> stdio_filebuf<_CharT, _Traits>:: stdio_filebuf(int __fd, std::ios_base::openmode __mode, size_t __size) { this->_M_file.sys_open(__fd, __mode); if (this->is_open()) { this->_M_mode = __mode; this->_M_buf_size = __size; this->_M_allocate_internal_buffer(); this->_M_reading = false; this->_M_writing = false; this->_M_set_buffer(-1); } } template<typename _CharT, typename _Traits> stdio_filebuf<_CharT, _Traits>:: stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode, size_t __size) { this->_M_file.sys_open(__f, __mode); if (this->is_open()) { this->_M_mode = __mode; this->_M_buf_size = __size; this->_M_allocate_internal_buffer(); this->_M_reading = false; this->_M_writing = false; this->_M_set_buffer(-1); } } _GLIBCXX_END_NAMESPACE #endif
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