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// Iostreams wrapper for stdio FILE* -*- C++ -*-
// Copyright (C) 2003 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// 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/stdiostream.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _EXT_STDIO_SYNC_FILEBUF
#define _EXT_STDIO_SYNC_FILEBUF
#pragma GCC system_header
#include <fstream>
#include <unistd.h>
#if defined(_GLIBCPP_HAVE_S_ISREG) || defined(_GLIBCPP_HAVE_S_IFREG)
# include <sys/stat.h>
# ifdef _GLIBCPP_HAVE_S_ISREG
# define _GLIBCPP_ISREG(x) S_ISREG(x)
# else
# define _GLIBCPP_ISREG(x) (((x) & S_IFMT) == S_IFREG)
# endif
#endif
#ifdef _GLIBCPP_USE_WCHAR_T
#include <cwchar>
#endif
namespace __gnu_cxx
{
template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
class stdio_sync_filebuf : public std::basic_streambuf<_CharT, _Traits>
{
private:
std::__c_file* const _M_file;
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;
explicit
stdio_sync_filebuf(std::__c_file* __f) : _M_file(__f) { }
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()
{ return this->syncgetc(); }
virtual int_type
pbackfail(int_type __c = traits_type::eof())
{ return this->syncungetc(__c); }
virtual std::streamsize
xsgetn(char_type* __s, std::streamsize __n);
virtual std::streamsize
showmanyc()
{
#if defined(_GLIBCPP_HAVE_S_ISREG) || defined(_GLIBCPP_HAVE_S_IFREG)
// Regular files.
struct stat __buffer;
int __ret = fstat(fileno(_M_file), &__buffer);
if (!__ret && _GLIBCPP_ISREG(__buffer.st_mode))
return __buffer.st_size - ftell(_M_file);
#endif
return 0;
}
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;
if (!fseek(_M_file, __off, __whence))
__ret = std::streampos(std::ftell(_M_file));
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)
{ return std::fread(__s, 1, __n, _M_file); }
template<>
inline std::streamsize
stdio_sync_filebuf<char>::xsputn(const char* __s, std::streamsize __n)
{ return std::fwrite(__s, 1, __n, _M_file); }
#ifdef _GLIBCPP_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++ = __c;
++__ret;
}
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 _GLIBCPP_EXTERN_TEMPLATE
extern template class stdio_sync_filebuf<char>;
#ifdef _GLIBCPP_USE_WCHAR_T
extern template class stdio_sync_filebuf<wchar_t>;
#endif
#endif
} // namespace __gnu_cxx
#endif
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