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Diffstat (limited to 'libstdc++/include/ext/stdio_filebuf.h')
| -rw-r--r-- | libstdc++/include/ext/stdio_filebuf.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/libstdc++/include/ext/stdio_filebuf.h b/libstdc++/include/ext/stdio_filebuf.h new file mode 100644 index 0000000..312a217 --- /dev/null +++ b/libstdc++/include/ext/stdio_filebuf.h @@ -0,0 +1,162 @@ +// File descriptor layer for filebuf -*- C++ -*- + +// Copyright (C) 2002, 2003, 2004, 2005 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +/** @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. + * + * 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 |
