mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-08 09:07:53 +00:00
320 lines
8.6 KiB
C++
320 lines
8.6 KiB
C++
// Iostreams wrapper for stdio FILE* -*- C++ -*-
|
|
|
|
// Copyright (C) 2003-2016 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_sync_filebuf.h
|
|
* This file is a GNU extension to the Standard C++ Library.
|
|
*/
|
|
|
|
#ifndef _STDIO_SYNC_FILEBUF_H
|
|
#define _STDIO_SYNC_FILEBUF_H 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#include <streambuf>
|
|
#include <unistd.h>
|
|
#include <cstdio>
|
|
#include <bits/c++io.h> // For __c_file
|
|
#include <bits/move.h> // For __exchange
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
#include <cwchar>
|
|
#endif
|
|
|
|
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* @brief Provides a layer of compatibility for C.
|
|
* @ingroup io
|
|
*
|
|
* This GNU extension provides extensions for working with standard
|
|
* C FILE*'s. 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_sync_filebuf : public std::basic_streambuf<_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;
|
|
|
|
private:
|
|
typedef std::basic_streambuf<_CharT, _Traits> __streambuf_type;
|
|
|
|
// Underlying stdio FILE
|
|
std::__c_file* _M_file;
|
|
|
|
// Last character gotten. This is used when pbackfail is
|
|
// called from basic_streambuf::sungetc()
|
|
int_type _M_unget_buf;
|
|
|
|
public:
|
|
explicit
|
|
stdio_sync_filebuf(std::__c_file* __f)
|
|
: _M_file(__f), _M_unget_buf(traits_type::eof())
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
stdio_sync_filebuf(stdio_sync_filebuf&& __fb) noexcept
|
|
: __streambuf_type(std::move(__fb)),
|
|
_M_file(__fb._M_file), _M_unget_buf(__fb._M_unget_buf)
|
|
{
|
|
__fb._M_file = nullptr;
|
|
__fb._M_unget_buf = traits_type::eof();
|
|
}
|
|
|
|
stdio_sync_filebuf&
|
|
operator=(stdio_sync_filebuf&& __fb) noexcept
|
|
{
|
|
__streambuf_type::operator=(__fb);
|
|
_M_file = std::__exchange(__fb._M_file, nullptr);
|
|
_M_unget_buf = std::__exchange(__fb._M_unget_buf, traits_type::eof());
|
|
return *this;
|
|
}
|
|
|
|
void
|
|
swap(stdio_sync_filebuf& __fb)
|
|
{
|
|
__streambuf_type::swap(__fb);
|
|
std::swap(_M_file, __fb._M_file);
|
|
std::swap(_M_unget_buf, __fb._M_unget_buf);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @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; }
|
|
|
|
protected:
|
|
int_type
|
|
syncgetc();
|
|
|
|
int_type
|
|
syncungetc(int_type __c);
|
|
|
|
int_type
|
|
syncputc(int_type __c);
|
|
|
|
virtual int_type
|
|
underflow()
|
|
{
|
|
int_type __c = this->syncgetc();
|
|
return this->syncungetc(__c);
|
|
}
|
|
|
|
virtual int_type
|
|
uflow()
|
|
{
|
|
// Store the gotten character in case we need to unget it.
|
|
_M_unget_buf = this->syncgetc();
|
|
return _M_unget_buf;
|
|
}
|
|
|
|
virtual int_type
|
|
pbackfail(int_type __c = traits_type::eof())
|
|
{
|
|
int_type __ret;
|
|
const int_type __eof = traits_type::eof();
|
|
|
|
// Check if the unget or putback was requested
|
|
if (traits_type::eq_int_type(__c, __eof)) // unget
|
|
{
|
|
if (!traits_type::eq_int_type(_M_unget_buf, __eof))
|
|
__ret = this->syncungetc(_M_unget_buf);
|
|
else // buffer invalid, fail.
|
|
__ret = __eof;
|
|
}
|
|
else // putback
|
|
__ret = this->syncungetc(__c);
|
|
|
|
// The buffered character is no longer valid, discard it.
|
|
_M_unget_buf = __eof;
|
|
return __ret;
|
|
}
|
|
|
|
virtual std::streamsize
|
|
xsgetn(char_type* __s, std::streamsize __n);
|
|
|
|
virtual int_type
|
|
overflow(int_type __c = traits_type::eof())
|
|
{
|
|
int_type __ret;
|
|
if (traits_type::eq_int_type(__c, traits_type::eof()))
|
|
{
|
|
if (std::fflush(_M_file))
|
|
__ret = traits_type::eof();
|
|
else
|
|
__ret = traits_type::not_eof(__c);
|
|
}
|
|
else
|
|
__ret = this->syncputc(__c);
|
|
return __ret;
|
|
}
|
|
|
|
virtual std::streamsize
|
|
xsputn(const char_type* __s, std::streamsize __n);
|
|
|
|
virtual int
|
|
sync()
|
|
{ return std::fflush(_M_file); }
|
|
|
|
virtual std::streampos
|
|
seekoff(std::streamoff __off, std::ios_base::seekdir __dir,
|
|
std::ios_base::openmode = std::ios_base::in | std::ios_base::out)
|
|
{
|
|
std::streampos __ret(std::streamoff(-1));
|
|
int __whence;
|
|
if (__dir == std::ios_base::beg)
|
|
__whence = SEEK_SET;
|
|
else if (__dir == std::ios_base::cur)
|
|
__whence = SEEK_CUR;
|
|
else
|
|
__whence = SEEK_END;
|
|
#ifdef _GLIBCXX_USE_LFS
|
|
if (!fseeko64(_M_file, __off, __whence))
|
|
__ret = std::streampos(ftello64(_M_file));
|
|
#else
|
|
if (!fseek(_M_file, __off, __whence))
|
|
__ret = std::streampos(std::ftell(_M_file));
|
|
#endif
|
|
return __ret;
|
|
}
|
|
|
|
virtual std::streampos
|
|
seekpos(std::streampos __pos,
|
|
std::ios_base::openmode __mode =
|
|
std::ios_base::in | std::ios_base::out)
|
|
{ return seekoff(std::streamoff(__pos), std::ios_base::beg, __mode); }
|
|
};
|
|
|
|
template<>
|
|
inline stdio_sync_filebuf<char>::int_type
|
|
stdio_sync_filebuf<char>::syncgetc()
|
|
{ return std::getc(_M_file); }
|
|
|
|
template<>
|
|
inline stdio_sync_filebuf<char>::int_type
|
|
stdio_sync_filebuf<char>::syncungetc(int_type __c)
|
|
{ return std::ungetc(__c, _M_file); }
|
|
|
|
template<>
|
|
inline stdio_sync_filebuf<char>::int_type
|
|
stdio_sync_filebuf<char>::syncputc(int_type __c)
|
|
{ return std::putc(__c, _M_file); }
|
|
|
|
template<>
|
|
inline std::streamsize
|
|
stdio_sync_filebuf<char>::xsgetn(char* __s, std::streamsize __n)
|
|
{
|
|
std::streamsize __ret = std::fread(__s, 1, __n, _M_file);
|
|
if (__ret > 0)
|
|
_M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);
|
|
else
|
|
_M_unget_buf = traits_type::eof();
|
|
return __ret;
|
|
}
|
|
|
|
template<>
|
|
inline std::streamsize
|
|
stdio_sync_filebuf<char>::xsputn(const char* __s, std::streamsize __n)
|
|
{ return std::fwrite(__s, 1, __n, _M_file); }
|
|
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
template<>
|
|
inline stdio_sync_filebuf<wchar_t>::int_type
|
|
stdio_sync_filebuf<wchar_t>::syncgetc()
|
|
{ return std::getwc(_M_file); }
|
|
|
|
template<>
|
|
inline stdio_sync_filebuf<wchar_t>::int_type
|
|
stdio_sync_filebuf<wchar_t>::syncungetc(int_type __c)
|
|
{ return std::ungetwc(__c, _M_file); }
|
|
|
|
template<>
|
|
inline stdio_sync_filebuf<wchar_t>::int_type
|
|
stdio_sync_filebuf<wchar_t>::syncputc(int_type __c)
|
|
{ return std::putwc(__c, _M_file); }
|
|
|
|
template<>
|
|
inline std::streamsize
|
|
stdio_sync_filebuf<wchar_t>::xsgetn(wchar_t* __s, std::streamsize __n)
|
|
{
|
|
std::streamsize __ret = 0;
|
|
const int_type __eof = traits_type::eof();
|
|
while (__n--)
|
|
{
|
|
int_type __c = this->syncgetc();
|
|
if (traits_type::eq_int_type(__c, __eof))
|
|
break;
|
|
__s[__ret] = traits_type::to_char_type(__c);
|
|
++__ret;
|
|
}
|
|
|
|
if (__ret > 0)
|
|
_M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);
|
|
else
|
|
_M_unget_buf = traits_type::eof();
|
|
return __ret;
|
|
}
|
|
|
|
template<>
|
|
inline std::streamsize
|
|
stdio_sync_filebuf<wchar_t>::xsputn(const wchar_t* __s,
|
|
std::streamsize __n)
|
|
{
|
|
std::streamsize __ret = 0;
|
|
const int_type __eof = traits_type::eof();
|
|
while (__n--)
|
|
{
|
|
if (traits_type::eq_int_type(this->syncputc(*__s++), __eof))
|
|
break;
|
|
++__ret;
|
|
}
|
|
return __ret;
|
|
}
|
|
#endif
|
|
|
|
#if _GLIBCXX_EXTERN_TEMPLATE
|
|
extern template class stdio_sync_filebuf<char>;
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
extern template class stdio_sync_filebuf<wchar_t>;
|
|
#endif
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif
|