mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-07 13:54:33 +00:00
172 lines
5.5 KiB
C++
172 lines
5.5 KiB
C++
// File descriptor layer for filebuf -*- C++ -*-
|
|
|
|
// Copyright (C) 2002-2019 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>
|
|
|
|
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* @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();
|
|
|
|
#if __cplusplus >= 201103L
|
|
stdio_filebuf(stdio_filebuf&&) = default;
|
|
stdio_filebuf& operator=(stdio_filebuf&&) = default;
|
|
|
|
void
|
|
swap(stdio_filebuf& __fb)
|
|
{ std::basic_filebuf<_CharT, _Traits>::swap(__fb); }
|
|
#endif
|
|
|
|
/**
|
|
* @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_VERSION
|
|
} // namespace
|
|
|
|
#endif
|