* 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:
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
