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// (C) Copyright John Maddock 2001.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/config for most recent version.
// MACRO: BOOST_NO_STD_WSTREAMBUF
// TITLE: std::basic_streambuf<wchar_t>
// DESCRIPTION: The standard library lacks std::basic_streambuf<wchar_t>.
#include <iostream>
#include <streambuf>
#include <string>
namespace boost_no_std_wstreambuf{
template <class charT,
class traits = ::std::char_traits<charT> >
class parser_buf : public ::std::basic_streambuf<charT, traits>
{
typedef ::std::basic_streambuf<charT, traits> base_type;
typedef typename base_type::int_type int_type;
typedef typename base_type::char_type char_type;
typedef typename base_type::pos_type pos_type;
typedef ::std::streamsize streamsize;
typedef typename base_type::off_type off_type;
public:
parser_buf() : base_type() { setbuf(0, 0); }
const charT* getnext() { return this->gptr(); }
protected:
std::basic_streambuf<charT, traits>* setbuf(char_type* s, streamsize n);
typename parser_buf<charT, traits>::pos_type seekpos(pos_type sp, ::std::ios_base::openmode which);
typename parser_buf<charT, traits>::pos_type seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which);
private:
parser_buf& operator=(const parser_buf&)
{ return *this; };
parser_buf(const parser_buf&);
};
template<class charT, class traits>
std::basic_streambuf<charT, traits>*
parser_buf<charT, traits>::setbuf(char_type* s, streamsize n)
{
this->setg(s, s, s + n);
return this;
}
template<class charT, class traits>
typename parser_buf<charT, traits>::pos_type
parser_buf<charT, traits>::seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which)
{
typedef typename parser_buf<charT, traits>::pos_type pos_type;
if(which & ::std::ios_base::out)
return pos_type(off_type(-1));
int size = this->egptr() - this->eback();
int pos = this->gptr() - this->eback();
charT* g = this->eback();
switch((int)way)
{
case ::std::ios_base::beg:
if((off < 0) || (off > size))
return pos_type(off_type(-1));
else
this->setg(g, g + off, g + size);
case ::std::ios_base::end:
if((off < 0) || (off > size))
return pos_type(off_type(-1));
else
this->setg(g, g + size - off, g + size);
case ::std::ios_base::cur:
{
int newpos = pos + off;
if((newpos < 0) || (newpos > size))
return pos_type(off_type(-1));
else
this->setg(g, g + newpos, g + size);
}
}
return static_cast<pos_type>(this->gptr() - this->eback());
}
template<class charT, class traits>
typename parser_buf<charT, traits>::pos_type
parser_buf<charT, traits>::seekpos(pos_type sp, ::std::ios_base::openmode which)
{
if(which & ::std::ios_base::out)
return pos_type(off_type(-1));
int size = this->egptr() - this->eback();
charT* g = this->eback();
if(off_type(sp) <= size)
{
this->setg(g, g + off_type(sp), g + size);
}
return pos_type(off_type(-1));
}
int test()
{
return 0;
}
template class parser_buf<char>;
template class parser_buf<wchar_t>;
}
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