/*

  * © Portions copyright (c) 2006-2007 Nokia Corporation.  All rights reserved.

  *

  * Copyright (c) 1999

  * Silicon Graphics Computer Systems, Inc.

  *

  * Copyright (c) 1999 

  * Boris Fomitchev

  *

  * This material is provided "as is", with absolutely no warranty expressed

  * or implied. Any use is at your own risk.

  *

  * Permission to use or copy this software for any purpose is hereby granted 

  * without fee, provided the above notices are retained on all copies.

  * Permission to modify the code and to distribute modified code is granted,

  * provided the above notices are retained, and a notice that the code was

  * modified is included with the above copyright notice.

  *

  */ 

 // This header defines classes basic_filebuf, basic_ifstream,

 // basic_ofstream, and basic_fstream.  These classes represent

 // streambufs and streams whose sources or destinations are files.

 #ifndef _STLP_INTERNAL_FSTREAM_H

 #define _STLP_INTERNAL_FSTREAM_H

 #if defined(__sgi) && !defined(__GNUC__) && !defined(_STANDARD_C_PLUS_PLUS)

 #error This header file requires the -LANG:std option

 #endif

 #ifndef _STLP_INTERNAL_STREAMBUF

 # include <stl/_streambuf.h>

 #endif

 #ifndef _STLP_INTERNAL_ISTREAM_H

 #include <stl/_istream.h>

 #endif

 #ifndef _STLP_INTERNAL_CODECVT_H

 #include <stl/_codecvt.h>

 #endif

 #ifndef _STLP_STDIO_FILE_H

 #include <stl/_stdio_file.h>

 #endif

 // fbp : let us map 1 MB maximum, just be sure not to trash VM

 //for hardware defining 8kb of mmap chunk

 # ifdef __SYMBIAN32__

 # define MMAP_CHUNK 0x2000UL

 # else

 # define MMAP_CHUNK 0x100000UL

 # endif

 #if !defined (_STLP_USE_UNIX_IO) && !defined(_STLP_USE_WIN32_IO) \

     && ! defined (_STLP_USE_UNIX_EMULATION_IO) && !defined (_STLP_USE_STDIO_IO)

 # if defined (_STLP_UNIX)  || defined (__CYGWIN__) || defined (__amigaos__) || defined (__EMX__) || defined (__SYMBIAN32__)

 // open/close/read/write

 #  define _STLP_USE_UNIX_IO

 # elif defined (_STLP_WIN32)  && ! defined (__CYGWIN__)

 // CreateFile/ReadFile/WriteFile

 #  define _STLP_USE_WIN32_IO

 # elif defined (_STLP_WIN16) || defined (_STLP_WIN32) || defined (_STLP_MAC)

 // _open/_read/_write

 #  define _STLP_USE_UNIX_EMULATION_IO

 # else

 // fopen/fread/fwrite

 #  define _STLP_USE_STDIO_IO

 # endif /* _STLP_UNIX */

 #endif /* mode selection */

 #if defined (_STLP_USE_WIN32_IO)

 typedef void* _STLP_fd;

 #elif defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO) || defined (_STLP_USE_UNIX_IO)

 typedef int _STLP_fd;

 #else

 #error "Configure i/o !"

 #endif

 _STLP_BEGIN_NAMESPACE

 #if defined(__LIBSTD_CPP_SYMBIAN32_WSD__) || defined(_STLP_LIBSTD_CPP_NO_STATIC_VAR_)

 _STLP_DECLSPEC size_t& get_fstream_Filebuf_Base_GetPageSize();

 #endif //__LIBSTD_CPP_SYMBIAN32_WSD__

 //----------------------------------------------------------------------

 // Class _Filebuf_base, a private base class to factor out the system-

 // dependent code from basic_filebuf<>.

 class _STLP_CLASS_DECLSPEC _Filebuf_base {

 public:                      // Opening and closing files.

   _STLP_DECLSPEC _Filebuf_base();

   _STLP_DECLSPEC bool _M_open(const char*, ios_base::openmode, long __protection);

   _STLP_DECLSPEC bool _M_open(const char*, ios_base::openmode);

   _STLP_DECLSPEC bool _M_open(int __id, ios_base::openmode = ios_base::__default_mode);

   _STLP_DECLSPEC bool _M_close();

 public:                      // Low-level I/O, like Unix read/write

   _STLP_DECLSPEC ptrdiff_t _M_read(char* __buf,  ptrdiff_t __n);

   _STLP_DECLSPEC streamoff _M_seek(streamoff __offset, ios_base::seekdir __dir);

   _STLP_DECLSPEC streamoff _M_file_size();

   _STLP_DECLSPEC bool _M_write(char* __buf,  ptrdiff_t __n);

 public:                      // Memory-mapped I/O.

   _STLP_DECLSPEC void* _M_mmap(streamoff __offset, streamoff __len);

   _STLP_DECLSPEC void _M_unmap(void* __mmap_base, streamoff __len);

 public:

   // Returns a value n such that, if pos is the file pointer at the

   // beginning of the range [first, last), pos + n is the file pointer at

   // the end.  On many operating systems n == __last - __first.

   // In Unix, writing n characters always bumps the file position by n.

   // In Windows text mode, however, it bumps the file position by n + m,

   // where m is the number of newlines in the range.  That's because an

   // internal \n corresponds to an external two-character sequence.

   streamoff _M_get_offset(char* __first, char* __last) {

 #if defined (_STLP_UNIX) || defined (_STLP_MAC)

     return __last - __first;

 #else // defined (_STLP_WIN32) || defined (_STLP_WIN16) || defined (_STLP_DOS)

     return ( (_M_openmode & ios_base::binary) != 0 )

       ? (__last - __first)

       : count(__first, __last, '\n') + (__last - __first);

 #endif

   }

   // Returns true if we're in binary mode or if we're using an OS or file 

   // system where there is no distinction between text and binary mode.

   bool _M_in_binary_mode() const {

 # if defined (_STLP_UNIX) || defined (_STLP_MAC)  || defined(__BEOS__) || defined (__amigaos__) || defined (_STLP_VXWORKS_TORNADO)

     return true;

 # elif defined (_STLP_WIN32) || defined (_STLP_WIN16) || defined (_STLP_DOS) || defined (_STLP_VM) || defined (__EMX__)

     return (_M_openmode & ios_base::binary) != 0;

 # else 

 //#   error "Port!"

 #pragma message(" Symbian I/O stream support on progress."__FILE__)

 # endif

   }

 protected:                      // Static data members.

 # if !defined(__LIBSTD_CPP_SYMBIAN32_WSD__) && !defined(_STLP_LIBSTD_CPP_NO_STATIC_VAR_)

   static size_t _M_page_size;

 #endif //__SYMBIAN32__

 protected:                      // Data members.

   _STLP_fd _M_file_id;

 # ifdef _STLP_USE_STDIO_IO

   // for stdio, the whole FILE* is being kept here

   FILE* _M_file;

 # endif

 # ifdef _STLP_USE_WIN32_IO

   void* _M_view_id; 

 # endif

   ios_base::openmode _M_openmode     ;

   unsigned char      _M_is_open      ;

   unsigned char      _M_should_close ;

   unsigned char      _M_regular_file ;

 public :

 #if defined(__LIBSTD_CPP_SYMBIAN32_WSD__) || defined(_STLP_LIBSTD_CPP_NO_STATIC_VAR_)

   static size_t  _STLP_CALL __page_size() { return get_fstream_Filebuf_Base_GetPageSize(); }

 #else

   static size_t  _STLP_CALL __page_size() { return _M_page_size; } 

 #endif  

   int  __o_mode() const { return (int)_M_openmode; } 

   bool __is_open()      const { return (_M_is_open !=0 ); } 

   bool __should_close() const { return (_M_should_close != 0); } 

   bool __regular_file() const { return (_M_regular_file != 0); }

   _STLP_fd __get_fd() const { return _M_file_id; }

 };

 //----------------------------------------------------------------------

 // Class basic_filebuf<>.

 // Forward declaration of two helper classes.

 template <class _Traits> class _Noconv_input;

 _STLP_TEMPLATE_NULL

 class _Noconv_input<char_traits<char> >;

 template <class _Traits> class _Noconv_output;

 _STLP_TEMPLATE_NULL

 class _Noconv_output< char_traits<char> >;

 // There is a specialized version of underflow, for basic_filebuf<char>,

 // in fstream.cxx.

 template <class _CharT, class _Traits>

 class _Underflow;

  _STLP_TEMPLATE_NULL class _Underflow< char, char_traits<char> >;

 template <class _CharT, class _Traits>

 class basic_filebuf : public basic_streambuf<_CharT, _Traits>

 {

 public:                         // Types.

   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 _Traits                    traits_type;

   typedef typename _Traits::state_type _State_type;

   typedef basic_streambuf<_CharT, _Traits> _Base;

   typedef basic_filebuf<_CharT, _Traits> _Self;

 public:                         // Constructors, destructor.

   basic_filebuf();  

   ~basic_filebuf();

 public:                         // Opening and closing files.

   bool is_open() const { return _M_base.__is_open(); }

   _Self* open(const char* __s, ios_base::openmode __m) {

     return _M_base._M_open(__s, __m) ? this : 0;

   }

 # ifndef _STLP_NO_EXTENSIONS

   // These two version of open() and file descriptor getter are extensions.

   _Self* open(const char* __s, ios_base::openmode __m,

 		      long __protection) {

     return _M_base._M_open(__s, __m, __protection) ? this : 0;

   }

   _STLP_fd fd() const { return _M_base.__get_fd(); }

   _Self* open(int __id, ios_base::openmode _Init_mode = ios_base::__default_mode) {

     return this->_M_open(__id, _Init_mode);

   }

 # endif

   _Self* _M_open(int __id, ios_base::openmode _Init_mode = ios_base::__default_mode) {

     return _M_base._M_open(__id, _Init_mode) ? this : 0;

   }

   _Self* close();

 protected:                      // Virtual functions from basic_streambuf.

   virtual streamsize showmanyc();

   virtual int_type underflow();

   virtual int_type pbackfail(int_type = traits_type::eof());

   virtual int_type overflow(int_type = traits_type::eof());

   virtual basic_streambuf<_CharT, _Traits>* setbuf(char_type*, streamsize);

   virtual pos_type seekoff(off_type, ios_base::seekdir,

                            ios_base::openmode = ios_base::in | ios_base::out);

   virtual pos_type seekpos(pos_type,

                            ios_base::openmode = ios_base::in | ios_base::out);

   virtual int sync();

   virtual void imbue(const locale&);

 #ifdef __SYMBIAN32__  

   virtual int save_read_buffer ();

   virtual void _change_input_mode();

 #endif

 private:                        // Helper functions.

   // Precondition: we are currently in putback input mode.  Effect:

   // switches back to ordinary input mode.

   void _M_exit_putback_mode() {

     this->setg(_M_saved_eback, _M_saved_gptr, _M_saved_egptr);

     _M_in_putback_mode = false;

   }

   bool _M_switch_to_input_mode();

   void _M_exit_input_mode();

   bool _M_switch_to_output_mode();

   int_type _M_input_error();

   int_type _M_underflow_aux();

   //  friend class _Noconv_input<_Traits>;

   //  friend class _Noconv_output<_Traits>;

   friend class _Underflow<_CharT, _Traits>;

   int_type _M_output_error();

   bool _M_unshift();

   bool _M_allocate_buffers(_CharT* __buf, streamsize __n);

   bool _M_allocate_buffers();

   void _M_deallocate_buffers();

   pos_type _M_seek_return(off_type __off, _State_type __state) {

     if (__off != -1) {

       if (_M_in_input_mode)

         _M_exit_input_mode();

 #ifndef __SYMBIAN32__	  

       _M_in_input_mode = false; //moved down, because setg again sets  input mode

 #endif

       _M_in_output_mode = false;

       _M_in_putback_mode = false;

       _M_in_error_mode = false;

       this->setg(0, 0, 0);

       this->setp(0, 0);

 #ifdef __SYMBIAN32__	  

 			_M_in_input_mode = false; 

 #endif

     }

     pos_type __result(__off);

     __result.state(__state);

     return __result;

   }

   bool _M_seek_init(bool __do_unshift);

   void _M_setup_codecvt(const locale&);

 private:                        // Data members used in all modes.

   _Filebuf_base _M_base;

 private:                        // Locale-related information.

   unsigned char _M_constant_width;

   unsigned char _M_always_noconv;

   // private:                        // Mode flags.

   unsigned char _M_int_buf_dynamic;  // True if internal buffer is heap allocated,

   // false if it was supplied by the user.

   unsigned char _M_in_input_mode;

   unsigned char _M_in_output_mode;

   unsigned char _M_in_error_mode;

   unsigned char _M_in_putback_mode;

   // Internal buffer: characters seen by the filebuf's clients.

   _CharT* _M_int_buf;

   _CharT* _M_int_buf_EOS;

   // External buffer: characters corresponding to the external file.

   char* _M_ext_buf;

   char* _M_ext_buf_EOS;

   // The range [_M_ext_buf, _M_ext_buf_converted) contains the external

   // characters corresponding to the sequence in the internal buffer.  The

   // range [_M_ext_buf_converted, _M_ext_buf_end) contains characters that

   // have been read into the external buffer but have not been converted

   // to an internal sequence.

   char* _M_ext_buf_converted;

   char* _M_ext_buf_end;

   // State corresponding to beginning of internal buffer.

   _State_type _M_state;

 private:                        // Data members used only in input mode.

   // Similar to _M_state except that it corresponds to

   // the end of the internal buffer instead of the beginning.

   _State_type _M_end_state;

   // This is a null pointer unless we are in mmap input mode.

   void*     _M_mmap_base;

   streamoff _M_mmap_len;

 private:                        // Data members used only in putback mode.

   _CharT* _M_saved_eback;

   _CharT* _M_saved_gptr;

   _CharT* _M_saved_egptr;

   typedef codecvt<_CharT, char, _State_type> _Codecvt;

   const _Codecvt* _M_codecvt;

   int _M_width;                 // Width of the encoding (if constant), else 1

   int _M_max_width;             // Largest possible width of single character.

   enum { _S_pback_buf_size = 8 };

   _CharT _M_pback_buf[_S_pback_buf_size];

   // for _Noconv_output

 public:

   bool _M_write(char* __buf,  ptrdiff_t __n) {return _M_base._M_write(__buf, __n); }

 public:

   int_type

   _M_do_noconv_input() {

     _M_ext_buf_converted = _M_ext_buf_end;

     this->setg((char_type*)_M_ext_buf, (char_type*)_M_ext_buf, (char_type*)_M_ext_buf_end);

     return traits_type::to_int_type(*_M_ext_buf);

   }

 };

 # if defined (_STLP_USE_TEMPLATE_EXPORT)

 _STLP_EXPORT_TEMPLATE_CLASS basic_filebuf<char, char_traits<char> >;

 #  if ! defined (_STLP_NO_WCHAR_T)

 _STLP_EXPORT_TEMPLATE_CLASS basic_filebuf<wchar_t, char_traits<wchar_t> >;

 #  endif

 # endif /* _STLP_USE_TEMPLATE_EXPORT */

 // public:

 // helper class.

 template <class _CharT>

 struct _Filebuf_Tmp_Buf

 {

   _CharT* _M_ptr;

   _Filebuf_Tmp_Buf(ptrdiff_t __n) : _M_ptr(0) { _M_ptr = new _CharT[__n]; }

   ~_Filebuf_Tmp_Buf() { delete[] _M_ptr; }

 };

 //

 // This class had to be designed very carefully to work

 // with Visual C++.

 //

 template <class _Traits>

 class _Noconv_output {

 public:

   typedef typename _Traits::char_type char_type;

   static bool  _STLP_CALL _M_doit(basic_filebuf<char_type, _Traits >*, 

                                   char_type*, char_type*)

   {

       return false; 

   }

 };

 _STLP_TEMPLATE_NULL

 class _STLP_CLASS_DECLSPEC _Noconv_output< char_traits<char> > {

 public:

   static bool  _STLP_CALL

   _M_doit(basic_filebuf<char, char_traits<char> >* __buf, 

           char* __first, char* __last)

   {

     ptrdiff_t __n = __last - __first;

     if (__buf->_M_write(__first, __n)) {

       return true;

     }

     else

       return false; 

   }

 };

 //----------------------------------------------------------------------

 // basic_filebuf<> helper functions.

 //----------------------------------------

 // Helper functions for switching between modes.

 //

 // This class had to be designed very carefully to work

 // with Visual C++.

 //

 template <class _Traits>

 class _Noconv_input {

 public:

   typedef typename _Traits::int_type int_type;

   typedef typename _Traits::char_type char_type;

   static inline int_type _STLP_CALL

   _M_doit(basic_filebuf<char_type, _Traits>*) 

   {

     return 0;

   }

 };

 _STLP_TEMPLATE_NULL

 class _Noconv_input<char_traits<char> > {

 public:

   static inline int _STLP_CALL

   _M_doit(basic_filebuf<char, char_traits<char> >* __buf)  {

     return __buf->_M_do_noconv_input();

   }

 };

 // underflow() may be called for one of two reasons.  (1) We've

 // been going through the special putback buffer, and we need to move back

 // to the regular internal buffer.  (2) We've exhausted the internal buffer,

 // and we need to replentish it.  

 template <class _CharT, class _Traits>

 class _Underflow {

 public:

   typedef typename _Traits::int_type int_type;

   typedef _Traits                    traits_type;

   static int_type _STLP_CALL _M_doit(basic_filebuf<_CharT, _Traits>* __this);

 };

 // Specialization of underflow: if the character type is char, maybe

 // we can use mmap instead of read.

 _STLP_TEMPLATE_NULL

 class _STLP_CLASS_DECLSPEC _Underflow< char, char_traits<char> > {

 public:

   typedef char_traits<char>::int_type int_type;

   typedef char_traits<char> traits_type;

   _STLP_DECLSPEC static  int _STLP_CALL _M_doit(basic_filebuf<char, traits_type >* __this);

 };

 // There is a specialized version of underflow, for basic_filebuf<char>,

 // in fstream.cxx.

 template <class _CharT, class _Traits>

 _STLP_TYPENAME_ON_RETURN_TYPE _Underflow<_CharT, _Traits>::int_type // _STLP_CALL

  _Underflow<_CharT, _Traits>::_M_doit(basic_filebuf<_CharT, _Traits>* __this)

 {

   if (!__this->_M_in_input_mode) {

     if (!__this->_M_switch_to_input_mode())

       return traits_type::eof();

   }

   else if (__this->_M_in_putback_mode) {

     __this->_M_exit_putback_mode();

     if (__this->gptr() != __this->egptr()) {

       int_type __c = traits_type::to_int_type(*__this->gptr());

       return __c;

     }

   }

   return __this->_M_underflow_aux();

 }

 #if defined( _STLP_USE_TEMPLATE_EXPORT ) && ! defined (_STLP_NO_WCHAR_T)

 _STLP_EXPORT_TEMPLATE_CLASS _Underflow<wchar_t, char_traits<wchar_t> >;

 #endif

 //----------------------------------------------------------------------

 // Class basic_ifstream<>

 template <class _CharT, class _Traits>

 class basic_ifstream : public basic_istream<_CharT, _Traits>

 {

 public:                         // Types

   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 _Traits                    traits_type;

   typedef basic_ios<_CharT, _Traits>                _Basic_ios;

   typedef basic_istream<_CharT, _Traits>            _Base;

   typedef basic_filebuf<_CharT, _Traits>            _Buf;

 public:                         // Constructors, destructor.

   basic_ifstream() : 

     basic_ios<_CharT, _Traits>(),  basic_istream<_CharT, _Traits>(0), _M_buf() {

       this->init(&_M_buf);

   }

   explicit basic_ifstream(const char* __s, ios_base::openmode __mod = ios_base::in) : 

     basic_ios<_CharT, _Traits>(),  basic_istream<_CharT, _Traits>(0),

     _M_buf() {

       this->init(&_M_buf);

       if (!_M_buf.open(__s, __mod | ios_base::in))

 	this->setstate(ios_base::failbit);

   }

 # ifndef _STLP_NO_EXTENSIONS

   explicit basic_ifstream(int __id, ios_base::openmode __mod = ios_base::in) : 

     basic_ios<_CharT, _Traits>(),  basic_istream<_CharT, _Traits>(0), _M_buf() {

     this->init(&_M_buf);

     if (!_M_buf.open(__id, __mod | ios_base::in))

       this->setstate(ios_base::failbit);

   }

   basic_ifstream(const char* __s, ios_base::openmode __m,

 		 long __protection) : 

     basic_ios<_CharT, _Traits>(),  basic_istream<_CharT, _Traits>(0), _M_buf() {

     this->init(&_M_buf);

     if (!_M_buf.open(__s, __m | ios_base::in, __protection))

       this->setstate(ios_base::failbit);  

   }

 # endif

   ~basic_ifstream() {}

 public:                         // File and buffer operations.

   basic_filebuf<_CharT, _Traits>* rdbuf() const

     { return __CONST_CAST(_Buf*,&_M_buf); }

   bool is_open() {

     return this->rdbuf()->is_open();

   }

   void open(const char* __s, ios_base::openmode __mod = ios_base::in) {

     if (!this->rdbuf()->open(__s, __mod | ios_base::in))

       this->setstate(ios_base::failbit);

   }

   void close() {

     if (!this->rdbuf()->close())

       this->setstate(ios_base::failbit);

   }

 private:

   basic_filebuf<_CharT, _Traits> _M_buf;

 };

 //----------------------------------------------------------------------

 // Class basic_ofstream<>

 template <class _CharT, class _Traits>

 class basic_ofstream : public basic_ostream<_CharT, _Traits>

 {

 public:                         // Types

   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 _Traits                    traits_type;

   typedef basic_ios<_CharT, _Traits>                _Basic_ios;

   typedef basic_ostream<_CharT, _Traits>            _Base;

   typedef basic_filebuf<_CharT, _Traits>            _Buf;

 public:                         // Constructors, destructor.

   basic_ofstream() : 

     basic_ios<_CharT, _Traits>(), 

     basic_ostream<_CharT, _Traits>(0), _M_buf() {

       this->init(&_M_buf);

   }

   explicit basic_ofstream(const char* __s, ios_base::openmode __mod = ios_base::out) 

     : basic_ios<_CharT, _Traits>(), basic_ostream<_CharT, _Traits>(0),

       _M_buf() {

 	this->init(&_M_buf);

 	if (!_M_buf.open(__s, __mod | ios_base::out))

 	  this->setstate(ios_base::failbit);

   }

 # ifndef _STLP_NO_EXTENSIONS

   explicit basic_ofstream(int __id, ios_base::openmode __mod = ios_base::out) 

     : basic_ios<_CharT, _Traits>(), basic_ostream<_CharT, _Traits>(0),

     _M_buf() {

  	this->init(&_M_buf);

  	if (!_M_buf.open(__id, __mod | ios_base::out))

  	  this->setstate(ios_base::failbit);

   }

   basic_ofstream(const char* __s, ios_base::openmode __m, long __protection) : 

     basic_ios<_CharT, _Traits>(),  basic_ostream<_CharT, _Traits>(0), _M_buf() {

     this->init(&_M_buf);

     if (!_M_buf.open(__s, __m | ios_base::out, __protection))

       this->setstate(ios_base::failbit);  

   }

 # endif

   ~basic_ofstream() {}

 public:                         // File and buffer operations.

   basic_filebuf<_CharT, _Traits>* rdbuf() const

     { return __CONST_CAST(_Buf*,&_M_buf); } 

   bool is_open() {

     return this->rdbuf()->is_open();

   }

   void open(const char* __s, ios_base::openmode __mod= ios_base::out) {

     if (!this->rdbuf()->open(__s, __mod | ios_base::out))

       this->setstate(ios_base::failbit);

   }

   void close() {

     if (!this->rdbuf()->close())

       this->setstate(ios_base::failbit);

   }

 private:

   basic_filebuf<_CharT, _Traits> _M_buf;

 };

 //----------------------------------------------------------------------

 // Class basic_fstream<>

 template <class _CharT, class _Traits>

 class basic_fstream : public basic_iostream<_CharT, _Traits>

 {

 public:                         // Types

   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 _Traits                    traits_type;

   typedef basic_ios<_CharT, _Traits>                _Basic_ios;

   typedef basic_iostream<_CharT, _Traits>           _Base;

   typedef basic_filebuf<_CharT, _Traits>            _Buf;

 public:                         // Constructors, destructor.

   _STLP_DECLSPEC basic_fstream();

   explicit basic_fstream(const char* __s,

                          ios_base::openmode __mod = ios_base::in | ios_base::out) :

     basic_ios<_CharT, _Traits>(), basic_iostream<_CharT, _Traits>(0), _M_buf() {

       this->init(&_M_buf);

       if (!_M_buf.open(__s, __mod))

 	this->setstate(ios_base::failbit);

   }

 # ifndef _STLP_NO_EXTENSIONS

   explicit basic_fstream(int __id,

                          ios_base::openmode __mod = ios_base::in | ios_base::out) :

     basic_ios<_CharT, _Traits>(), basic_iostream<_CharT, _Traits>(0), _M_buf() {

     this->init(&_M_buf);

     if (!_M_buf.open(__id, __mod))

       this->setstate(ios_base::failbit);

   }

   basic_fstream(const char* __s, ios_base::openmode __m, long __protection) : 

     basic_ios<_CharT, _Traits>(),  basic_iostream<_CharT, _Traits>(0), _M_buf() {

     this->init(&_M_buf);

     if (!_M_buf.open(__s, __m, __protection))

       this->setstate(ios_base::failbit);  

   }

 # endif    

   _STLP_DECLSPEC ~basic_fstream();

 public:                         // File and buffer operations.

   basic_filebuf<_CharT, _Traits>* rdbuf() const

     { return __CONST_CAST(_Buf*,&_M_buf); } 

   bool is_open() {

     return this->rdbuf()->is_open();

   }

   void open(const char* __s, 

 	    ios_base::openmode __mod = 

 	    ios_base::in | ios_base::out) {

     if (!this->rdbuf()->open(__s, __mod))

       this->setstate(ios_base::failbit);

   }

   void close() {

     if (!this->rdbuf()->close())

       this->setstate(ios_base::failbit);

   }

 private:

   basic_filebuf<_CharT, _Traits> _M_buf;

 };

 _STLP_END_NAMESPACE

 # if !defined (_STLP_LINK_TIME_INSTANTIATION)

 #  include <stl/_fstream.c>

 # endif

 _STLP_BEGIN_NAMESPACE

 # if defined (_STLP_USE_TEMPLATE_EXPORT)

 _STLP_EXPORT_TEMPLATE_CLASS basic_ifstream<char, char_traits<char> >;

 _STLP_EXPORT_TEMPLATE_CLASS basic_ofstream<char, char_traits<char> >;

 _STLP_EXPORT_TEMPLATE_CLASS basic_fstream<char, char_traits<char> >;

 #  if ! defined (_STLP_NO_WCHAR_T)

 _STLP_EXPORT_TEMPLATE_CLASS basic_ifstream<wchar_t, char_traits<wchar_t> >;

 _STLP_EXPORT_TEMPLATE_CLASS basic_ofstream<wchar_t, char_traits<wchar_t> >;

 _STLP_EXPORT_TEMPLATE_CLASS basic_fstream<wchar_t, char_traits<wchar_t> >;

 #  endif

 # endif /* _STLP_USE_TEMPLATE_EXPORT */

 _STLP_END_NAMESPACE

 #endif /* _STLP_FSTREAM */

 // Local Variables:

 // mode:C++

 // End: