/* Copyright (C) 2004 Garrett A. Kajmowicz
 *
 * This file is part of the uClibc++ Library.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <basic_definitions>

#ifndef HEADER_STD_SSTREAM
#define HEADER_STD_SSTREAM 1

#include <iosfwd>
#include <ios>
#include <istream>
#include <ostream>
#include <iostream>
#include <string>

#pragma GCC visibility push(default)

extern "C++"
{
namespace std
{
  template <class charT, class traits, class Allocator>
    class _UCXXEXPORT basic_stringbuf : public basic_streambuf<charT,traits>
  {
  public:
    typedef charT char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;
    typedef typename Allocator::size_type size_type;

    explicit _UCXXEXPORT basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out)
      : data(), ielement(0), oelement(0)
    {
      basic_streambuf<charT,traits>::openedFor = which;
    }

    explicit _UCXXEXPORT basic_stringbuf(const basic_string<charT,traits,Allocator>& str,
      ios_base::openmode which = ios_base::in | ios_base::out)
      : data(str), ielement(0), oelement(0)
    {
      if (which & ios_base::ate)
      {
        oelement = data.length();
      }

      basic_streambuf<charT,traits>::openedFor = which;
    }

    virtual _UCXXEXPORT ~basic_stringbuf() { }

    _UCXXEXPORT basic_string<charT,traits,Allocator> str() const
    {
      return data;
    }

    _UCXXEXPORT void str(const basic_string<charT,traits,Allocator>& s)
    {
      data = s;
      ielement = 0;
      if (basic_streambuf<charT,traits>::openedFor & ios_base::ate)
      {
        oelement = data.length();
      }
      else
      {
        oelement = 0;
      }
    }

  protected:
    virtual _UCXXEXPORT int sync()
    {
      return 0;
    }

    virtual _UCXXEXPORT int_type underflow()
    {
      if (ielement >= data.length())
      {
        return traits::eof();
      }

      return traits::to_int_type(data[ielement]);
    }

    virtual _UCXXEXPORT int_type uflow()
    {
      int_type retval = underflow();
      if (retval != traits::eof())
      {
        ++ielement;
      }

      return retval;  
    }

    virtual _UCXXEXPORT int_type   pbackfail(int_type c = traits::eof())
    {
      // Error possibilities

      if (ielement == 0)
      {
        return traits::eof();
      }

      if (ielement > data.length())
      {
        ielement = data.length();
        return traits::eof();
      }

      // eof passed in

      if (traits::eq_int_type(c,traits::eof())==true)
      {
        --ielement;
        return traits::not_eof(c);
      }

      if (traits::eq(traits::to_char_type(c),data[ielement-1]) == true)
      {
        --ielement;
        return c;
      }

      if (basic_streambuf<charT,traits>::openedFor & ios_base::out)
      {
        --ielement;
        data[ielement] = c;
        return c;
      }

      return traits::eof();
    }

    virtual _UCXXEXPORT int showmanyc()
    {
      return data.length() - ielement;
    }

    virtual _UCXXEXPORT streamsize xsgetn(char_type* c, streamsize n)
    {
      streamsize i = 0;
      while (ielement < data.length() && i < n)
      {
        c[i] = data[ielement];
        ++i;
        ++ielement;
      }

      return i;
    }

    virtual _UCXXEXPORT int_type overflow (int_type c = traits::eof())
    {
      // Nothing to do

      if (traits::eq_int_type(c,traits::eof()))
      {
        return traits::not_eof(c);
      }

      // Actually add character, if possible

      if (basic_streambuf<charT,traits>::openedFor & ios_base::out)
      {
        if (oelement >= data.length())
        {
          data.push_back(c);
        }
        else
        {
          data[oelement] = c;
        }

        ++oelement;
        return c;
      }

      // Not possible

      return traits::eof();
    }

    virtual _UCXXEXPORT basic_streambuf<charT,traits>* setbuf(charT*, streamsize)
    {
      //This function does nothing

      return this;
    }

    virtual _UCXXEXPORT streamsize xsputn(const char_type* s, streamsize n)
    {
      data.replace(oelement, n, s, n);
      oelement += n;
      return n;
    }

    virtual _UCXXEXPORT pos_type seekoff(off_type off, ios_base::seekdir way,
      ios_base::openmode which = ios_base::in | ios_base::out)
    {
      // Test for invalid option

      if ((which & ios_base::in) && (which & ios_base::out) && (way == ios_base::cur))
      {
        return -1;
      }

      // Calculate new location

      size_type newpos = 0;

      if (way == ios_base::beg)
      {
        newpos = off;
      }
      else if (way == ios_base::cur)
      {
        if (which & ios_base::out)
        {
          newpos = data.length() + off;
        }

        if (which & ios_base::in)
        {
          newpos = ielement + off;
        } 
      }
      else
      {
        newpos = data.length() + off;
      }

      // Test for error conditions

      if (newpos > data.length())
      {
        return -1;
      }

      // Shuffle pointers


      if (which & ios_base::in)
      {
        ielement = newpos;
      }

      if (which & ios_base::out)
      {
        data.resize(newpos);
        if (ielement > data.length())
        {
          ielement = data.length();
        }
      }

      return newpos;
    }
      
    virtual _UCXXEXPORT pos_type seekpos(pos_type sp, 
      ios_base::openmode which = ios_base::in | ios_base::out)
    {
      return seekoff(sp, ios_base::beg, which);
    }

    basic_string<charT,traits,Allocator> data;
    size_type ielement;
    size_type oelement;
  };

  template <class charT, class traits, class Allocator> class _UCXXEXPORT basic_istringstream
    : public basic_istream<charT,traits>
  {
  public:
    typedef charT char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;

    explicit _UCXXEXPORT basic_istringstream(ios_base::openmode m = ios_base::in) 
      : basic_ios<charT, traits>(&sb), basic_istream<charT,traits>(&sb), sb(m)
    {
    }

    explicit _UCXXEXPORT basic_istringstream(const basic_string<charT,traits,Allocator>& str, 
      ios_base::openmode which = ios_base::in) 
      : basic_ios<charT, traits>(&sb), basic_istream<charT,traits>(&sb), sb(str, which)
    {
    }

    virtual _UCXXEXPORT ~basic_istringstream() {  }

    _UCXXEXPORT basic_stringbuf<charT,traits,Allocator>* rdbuf() const
    {
      return &sb;
    }

    _UCXXEXPORT basic_string<charT,traits,Allocator> str() const
    {
      return sb.str();
    }

    _UCXXEXPORT void str(const basic_string<charT,traits,Allocator>& s){
      sb.str(s);
      basic_istream<charT,traits>::clear();
    }

  private:
    basic_stringbuf<charT,traits,Allocator> sb;
  };

  template <class charT, class traits, class Allocator> class _UCXXEXPORT basic_ostringstream
    : public basic_ostream<charT,traits>
  {
  public:
    typedef charT char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;

    explicit _UCXXEXPORT basic_ostringstream(ios_base::openmode m = ios_base::out)
      : basic_ios<charT, traits>(&sb), basic_ostream<charT,traits>(&sb), sb(m)
    {
    }

    explicit _UCXXEXPORT basic_ostringstream(const basic_string<charT,traits,Allocator>& str, 
      ios_base::openmode which = ios_base::out)
      : basic_ios<charT, traits>(&sb), basic_ostream<charT,traits>(&sb), sb(str, which)
    {
    }

    virtual _UCXXEXPORT ~basic_ostringstream() {  }

    _UCXXEXPORT basic_stringbuf<charT,traits,Allocator>* rdbuf() const
    {
      return &sb;
    }

    _UCXXEXPORT basic_string<charT,traits,Allocator> str() const
    {
      return sb.str();
    }

    _UCXXEXPORT void str(const basic_string<charT,traits,Allocator>& s)
    {
      sb.str(s);
      basic_ostream<charT,traits>::clear();
    }

  private:
    basic_stringbuf<charT,traits,Allocator> sb;
  };


  template <class charT, class traits, class Allocator> class _UCXXEXPORT basic_stringstream
     : public basic_iostream<charT,traits>
  {
  public:
    typedef charT char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;

    explicit _UCXXEXPORT basic_stringstream(ios_base::openmode which = ios_base::out|ios_base::in)
      : basic_ios<charT, traits>(&sb), basic_iostream<charT,traits>(&sb), sb(which)
    {
    }

    explicit _UCXXEXPORT basic_stringstream(const basic_string<charT,traits,Allocator>& str,
      ios_base::openmode which = ios_base::out|ios_base::in)
      : basic_ios<charT, traits>(&sb), basic_iostream<charT,traits>(&sb), sb(str, which)
    {
    }

    virtual _UCXXEXPORT ~basic_stringstream(){  }

    _UCXXEXPORT basic_stringbuf<charT,traits,Allocator>* rdbuf()
    {
      return &sb;
    }

    _UCXXEXPORT basic_string<charT,traits,Allocator> str() const
    {
      return sb.str();
    }

    _UCXXEXPORT void str(const basic_string<charT,traits,Allocator>& s)
    {
      sb.str(s);
      basic_iostream<charT,traits>::clear();
    }

  private:
    basic_stringbuf<charT, traits> sb;
  };

#ifdef __UCLIBCXX_EXPAND_SSTREAM_CHAR__
#ifndef __UCLIBCXX_COMPILE_SSTREAM__

#ifdef __UCLIBCXX_EXPAND_CONSTRUCTORS_DESTRUCTORS__

  template <> _UCXXEXPORT basic_stringbuf<char, char_traits<char>, allocator<char> >::
    basic_stringbuf(ios_base::openmode which);
  template <> _UCXXEXPORT basic_stringbuf<char, char_traits<char>, allocator<char> >::~basic_stringbuf();

#endif // __UCLIBCXX_EXPAND_CONSTRUCTORS_DESTRUCTORS__

  template <> _UCXXEXPORT basic_string<char, char_traits<char>, allocator<char> >
    basic_stringbuf<char, char_traits<char>, allocator<char> >::str() const;

  template <> _UCXXEXPORT basic_stringbuf<char, char_traits<char>, allocator<char> >::int_type
    basic_stringbuf<char, char_traits<char>, allocator<char> >::
      pbackfail(basic_stringbuf<char, char_traits<char>, allocator<char> >::int_type c);

  template <> _UCXXEXPORT basic_stringbuf<char, char_traits<char>, allocator<char> >::pos_type
    basic_stringbuf<char, char_traits<char>, allocator<char> >::
      seekoff (basic_stringbuf<char, char_traits<char>, allocator<char> >::off_type off,
        ios_base::seekdir way,
        ios_base::openmode which);

  template <> _UCXXEXPORT basic_stringbuf<char, char_traits<char>, allocator<char> >::int_type
    basic_stringbuf<char, char_traits<char>, allocator<char> >::
      overflow (basic_stringbuf<char, char_traits<char>, allocator<char> >::int_type c);

  template <> _UCXXEXPORT basic_stringbuf<char, char_traits<char>, allocator<char> >::int_type
    basic_stringbuf<char, char_traits<char>, allocator<char> >::underflow ();

  template <> _UCXXEXPORT streamsize basic_stringbuf<char, char_traits<char>, allocator<char> >::
    xsputn(const char* s, streamsize n);

#ifdef __UCLIBCXX_EXPAND_CONSTRUCTORS_DESTRUCTORS__

  template <> _UCXXEXPORT basic_stringstream<char, char_traits<char>, allocator<char> >::
    basic_stringstream(ios_base::openmode which);

  template <> _UCXXEXPORT basic_stringstream<char, char_traits<char>, allocator<char> >::~basic_stringstream();

  template <> _UCXXEXPORT basic_istringstream<char, char_traits<char>, allocator<char> >::~basic_istringstream();

  template <> _UCXXEXPORT basic_ostringstream<char, char_traits<char>, allocator<char> >::~basic_ostringstream();

#endif //__UCLIBCXX_EXPAND_CONSTRUCTORS_DESTRUCTORS__

#endif
#endif

#pragma GCC visibility pop

} // namespace
} // extern "C++"

#endif