/*

 * 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.

 *

 */

#ifndef _STLP_INTERNAL_STRSTREAM

#define _STLP_INTERNAL_STRSTREAM

#ifndef _STLP_INTERNAL_STREAMBUF

#  include <stl/_streambuf.h>

#endif

#ifndef _STLP_INTERNAL_ISTREAM

#  include <stl/_istream.h>              // Includes <ostream>, <ios>, <iosfwd>

#endif

#ifndef _STLP_INTERNAL_STRING_H

#  include <stl/_string.h>

#endif

_STLP_BEGIN_NAMESPACE

#ifndef _STLP_USE_NAMESPACES

#  define strstream _STLP_strstream

#  define ostrstream _STLP_ostrstream

#  define istrstream _STLP_istrstream

#  define strstreambuf _STLP_strstreambuf

#endif

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

// Class strstreambuf, a streambuf class that manages an array of char.

// Note that this class is not a template.

class _STLP_CLASS_DECLSPEC strstreambuf : public basic_streambuf<char, char_traits<char> > {

public:                         // Types.

  typedef char_traits<char>              _Traits;

  typedef basic_streambuf<char, char_traits<char> > _Base;

  typedef void* (*__alloc_fn)(size_t);

  typedef void (*__free_fn)(void*);

public:                         // Constructor, destructor

  explicit strstreambuf(streamsize _Initial_capacity = 0);

  strstreambuf(__alloc_fn, __free_fn);

  strstreambuf(char* __get, streamsize __n, char* __put = 0);

  strstreambuf(signed char* __get, streamsize __n, signed char* __put = 0);

  strstreambuf(unsigned char* __get, streamsize __n, unsigned char* __put=0);

  strstreambuf(const char* __get, streamsize __n);

  strstreambuf(const signed char* __get, streamsize __n);

  strstreambuf(const unsigned char* __get, streamsize __n);

  virtual ~strstreambuf();

public:                         // strstreambuf operations.

  void freeze(bool = true);

  char* str();

  int pcount() const;

protected:                      // Overridden virtual member functions.

  virtual int_type overflow(int_type __c  = _Traits::eof());

  virtual int_type pbackfail(int_type __c = _Traits::eof());

  virtual int_type underflow();

  virtual _Base* setbuf(char* __buf, streamsize __n);

  virtual pos_type seekoff(off_type __off, ios_base::seekdir __dir,

                           ios_base::openmode __mode

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

  virtual pos_type seekpos(pos_type __pos, ios_base::openmode __mode

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

private:                        // Helper functions.

  // Dynamic allocation, possibly using _M_alloc_fun and _M_free_fun.

  char* _M_alloc(size_t);

  void  _M_free(char*);

  // Helper function used in constructors.

  void _M_setup(char* __get, char* __put, streamsize __n);

private:                        // Data members.

  __alloc_fn _M_alloc_fun;

  __free_fn  _M_free_fun;

  bool _M_dynamic  : 1;

  bool _M_frozen   : 1;

  bool _M_constant : 1;

};

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

// Class istrstream, an istream that manages a strstreambuf.

class _STLP_CLASS_DECLSPEC istrstream : public basic_istream<char, char_traits<char> > {

public:

  explicit istrstream(char*);

  explicit istrstream(const char*);

  istrstream(char* , streamsize);

  istrstream(const char*, streamsize);

  virtual ~istrstream();

  strstreambuf* rdbuf() const;

  char* str();

private:

  strstreambuf _M_buf;

};

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

// Class ostrstream

class _STLP_CLASS_DECLSPEC ostrstream : public basic_ostream<char, char_traits<char> >

{

public:

  ostrstream();

  ostrstream(char*, int, ios_base::openmode = ios_base::out);

  virtual ~ostrstream();

  strstreambuf* rdbuf() const;

  void freeze(bool = true);

  char* str();

  int pcount() const;

private:

  strstreambuf _M_buf;

};

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

// Class strstream

class _STLP_CLASS_DECLSPEC strstream : public basic_iostream<char, char_traits<char> > {

public:

  typedef char                        char_type;

  typedef char_traits<char>::int_type int_type;

  typedef char_traits<char>::pos_type pos_type;

  typedef char_traits<char>::off_type off_type;

  strstream();

  strstream(char*, int, ios_base::openmode = ios_base::in | ios_base::out);

  virtual ~strstream();

  strstreambuf* rdbuf() const;

  void freeze(bool = true);

  int pcount() const;

  char* str();

private:

  strstreambuf _M_buf;

  //explicitely defined as private to avoid warnings:

  strstream(strstream const&);

  strstream& operator = (strstream const&);

};

_STLP_END_NAMESPACE

#endif /* _STLP_INTERNAL_STRSTREAM */