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git-svn-id: svn://kolibrios.org@4680 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/media/updf/include/bits/std_streambuf.h

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+// Stream buffer classes -*- C++ -*-
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001 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.
+
+//
+// ISO C++ 14882: 27.5  Stream buffers
+//
+
+#ifndef _CPP_STREAMBUF
+#define _CPP_STREAMBUF	1
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+#include <bits/std_iosfwd.h>
+#include <bits/std_cstdio.h> 	// For SEEK_SET, SEEK_CUR, SEEK_END
+#include <bits/localefwd.h>
+#include <bits/ios_base.h>
+
+namespace std
+{
+  template<typename _CharT, typename _Traits>
+    streamsize
+    __copy_streambufs(basic_ios<_CharT, _Traits>& _ios,
+		      basic_streambuf<_CharT, _Traits>* __sbin,
+		      basic_streambuf<_CharT, _Traits>* __sbout);
+  
+  // 27.5.2 Template class basic_streambuf<_CharT, _Traits>
+  template<typename _CharT, typename _Traits>
+    class basic_streambuf 
+    {
+    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;
+
+      // Non-standard Types:
+      typedef ctype<char_type>           		__ctype_type;
+      typedef basic_streambuf<char_type, traits_type>  	__streambuf_type;
+      
+      friend class basic_ios<char_type, traits_type>;
+      friend class basic_istream<char_type, traits_type>;
+      friend class basic_ostream<char_type, traits_type>;
+      friend class istreambuf_iterator<char_type, traits_type>;
+      friend class ostreambuf_iterator<char_type, traits_type>;
+
+      friend streamsize
+      __copy_streambufs<>(basic_ios<char_type, traits_type>& __ios,
+			  __streambuf_type* __sbin,__streambuf_type* __sbout);
+      
+    protected:
+
+      // Pointer to the beginning of internally-allocated
+      // space. Filebuf manually allocates/deallocates this, whereas
+      // stringstreams attempt to use the built-in intelligence of the
+      // string class. If you are managing memory, set this. If not,
+      // leave it NULL.
+      char_type*		_M_buf; 	
+
+      // Actual size of allocated internal buffer, in bytes.
+      int_type			_M_buf_size;
+
+      // Optimal or preferred size of internal buffer, in bytes.
+      int_type			_M_buf_size_opt;
+
+      // True iff _M_in_* and _M_out_* buffers should always point to
+      // the same place.  True for fstreams, false for sstreams.
+      bool 			_M_buf_unified;	
+
+       // This is based on _IO_FILE, just reordered to be more
+      // consistent, and is intended to be the most minimal abstraction
+      // for an internal buffer.
+      // get == input == read
+      // put == output == write
+      char_type* 		_M_in_beg;  	// Start of get area. 
+      char_type* 		_M_in_cur;	// Current read area. 
+      char_type* 		_M_in_end;	// End of get area. 
+      char_type* 		_M_out_beg; 	// Start of put area. 
+      char_type* 		_M_out_cur;  	// Current put area. 
+      char_type* 		_M_out_end;  	// End of put area. 
+
+      // Place to stash in || out || in | out settings for current streambuf.
+      ios_base::openmode 	_M_mode;	
+
+      // Current locale setting.
+      locale 			_M_buf_locale;	
+
+      // True iff locale is initialized.
+      bool 			_M_buf_locale_init;
+
+      // Necessary bits for putback buffer management. Only used in
+      // the basic_filebuf class, as necessary for the standard
+      // requirements. The only basic_streambuf member function that
+      // needs access to these data members is in_avail...
+      // NB: pbacks of over one character are not currently supported.
+      int_type    		_M_pback_size; 
+      char_type*		_M_pback; 
+      char_type*		_M_pback_cur_save;
+      char_type*		_M_pback_end_save;
+      bool			_M_pback_init; 
+
+      // Initializes pback buffers, and moves normal buffers to safety.
+      // Assumptions:
+      // _M_in_cur has already been moved back
+      void
+      _M_pback_create()
+      {
+	if (!_M_pback_init)
+	  {
+	    int_type __dist = _M_in_end - _M_in_cur;
+	    int_type __len = min(_M_pback_size, __dist);
+	    traits_type::copy(_M_pback, _M_in_cur, __len);
+	    _M_pback_cur_save = _M_in_cur;
+	    _M_pback_end_save = _M_in_end;
+	    this->setg(_M_pback, _M_pback, _M_pback + __len);
+	    _M_pback_init = true;
+	  }
+      }
+
+      // Deactivates pback buffer contents, and restores normal buffer.
+      // Assumptions:
+      // The pback buffer has only moved forward.
+      void
+      _M_pback_destroy()
+      {
+	if (_M_pback_init)
+	  {
+	    // Length _M_in_cur moved in the pback buffer.
+	    int_type __off_cur = _M_in_cur - _M_pback;
+	    
+	    // For in | out buffers, the end can be pushed back...
+	    int_type __off_end = 0;
+	    int_type __pback_len = _M_in_end - _M_pback;
+	    int_type __save_len = _M_pback_end_save - _M_buf;
+	    if (__pback_len > __save_len)
+	      __off_end = __pback_len - __save_len;
+
+	    this->setg(_M_buf, _M_pback_cur_save + __off_cur, 
+		       _M_pback_end_save + __off_end);
+	    _M_pback_cur_save = NULL;
+	    _M_pback_end_save = NULL;
+	    _M_pback_init = false;
+	  }
+      }
+
+      // Correctly sets the _M_in_cur pointer, and bumps the
+      // _M_out_cur pointer as well if necessary.
+      void 
+      _M_in_cur_move(off_type __n) // argument needs to be +-
+      {
+	bool __testout = _M_out_cur;
+	_M_in_cur += __n;
+	if (__testout && _M_buf_unified)
+	  _M_out_cur += __n;
+      }
+
+      // Correctly sets the _M_out_cur pointer, and bumps the
+      // appropriate _M_*_end pointers as well. Necessary for the
+      // un-tied stringbufs, in in|out mode.
+      // Invariant:
+      // __n + _M_out_[cur, end] <= _M_buf + _M_buf_size
+      // Assuming all _M_*_[beg, cur, end] pointers are operating on
+      // the same range:
+      // _M_buf <= _M_*_ <= _M_buf + _M_buf_size
+      void 
+      _M_out_cur_move(off_type __n) // argument needs to be +-
+      {
+	bool __testin = _M_in_cur;
+
+	_M_out_cur += __n;
+	if (__testin && _M_buf_unified)
+	  _M_in_cur += __n;
+	if (_M_out_cur > _M_out_end)
+	  {
+	    _M_out_end = _M_out_cur;
+	    // NB: in | out buffers drag the _M_in_end pointer along...
+	    if (__testin)
+	      _M_in_end += __n;
+	  }
+      }
+
+      // Return the size of the output buffer.  This depends on the
+      // buffer in use: allocated buffers have a stored size in
+      // _M_buf_size and setbuf() buffers don't.
+      off_type
+      _M_out_buf_size()
+      {
+	off_type __ret = 0;
+	if (_M_out_cur)
+	  {
+	    // Using allocated buffer.
+	    if (_M_out_beg == _M_buf)
+	      __ret = _M_out_beg + _M_buf_size - _M_out_cur;
+	    // Using non-allocated buffer.
+	    else
+	      __ret = _M_out_end - _M_out_cur;
+	  }
+	return __ret;
+      }
+
+      // These three functions are used to clarify internal buffer
+      // maintenance. After an overflow, or after a seekoff call that
+      // started at beg or end, or possibly when the stream becomes
+      // unbuffered, and a myrid other obscure corner cases, the
+      // internal buffer does not truly reflect the contents of the
+      // external buffer. At this point, for whatever reason, it is in
+      // an indeterminate state.
+      void
+      _M_set_indeterminate(void)
+      {
+	if (_M_mode & ios_base::in)
+	  this->setg(_M_buf, _M_buf, _M_buf);
+	if (_M_mode & ios_base::out)
+	  this->setp(_M_buf, _M_buf);
+      }
+
+      void
+      _M_set_determinate(off_type __off)
+      {
+	bool __testin = _M_mode & ios_base::in;
+	bool __testout = _M_mode & ios_base::out;
+	if (__testin)
+	  this->setg(_M_buf, _M_buf, _M_buf + __off);
+	if (__testout)
+	  this->setp(_M_buf, _M_buf + __off);
+      }
+
+      bool
+      _M_is_indeterminate(void)
+      { 
+	bool __ret = false;
+	// Don't return true if unbuffered.
+	if (_M_buf)
+	  {
+	    if (_M_mode & ios_base::in)
+	      __ret = _M_in_beg == _M_in_cur && _M_in_cur == _M_in_end;
+	    if (_M_mode & ios_base::out)
+	      __ret = _M_out_beg == _M_out_cur && _M_out_cur == _M_out_end;
+	  }
+	return __ret;
+      }
+
+  public:
+      virtual 
+      ~basic_streambuf() 
+      {
+	_M_buf_unified = false;
+	_M_buf_size = 0;
+	_M_buf_size_opt = 0;
+	_M_mode = ios_base::openmode(0);
+	_M_buf_locale_init = false;
+      }
+
+      // Locales:
+      locale 
+      pubimbue(const locale &__loc)
+      {
+	locale __tmp(this->getloc());
+	this->imbue(__loc);
+	return __tmp;
+      }
+
+      locale   
+      getloc() const
+      {
+	if (_M_buf_locale_init)
+	  return _M_buf_locale; 
+	else 
+	  return locale();
+      } 
+
+      // Buffer and positioning:
+      __streambuf_type* 
+      pubsetbuf(char_type* __s, streamsize __n) 
+      { return this->setbuf(__s, __n); }
+
+      pos_type 
+      pubseekoff(off_type __off, ios_base::seekdir __way, 
+		 ios_base::openmode __mode = ios_base::in | ios_base::out)
+      { return this->seekoff(__off, __way, __mode); }
+
+      pos_type 
+      pubseekpos(pos_type __sp,
+		 ios_base::openmode __mode = ios_base::in | ios_base::out)
+      { return this->seekpos(__sp, __mode); }
+
+      int 
+      pubsync() { return this->sync(); }
+
+      // Get and put areas:
+      // Get area:
+      streamsize 
+      in_avail() 
+      { 
+	streamsize __ret;
+	if (_M_in_cur && _M_in_cur < _M_in_end)
+	  {
+	    if (_M_pback_init)
+	      {
+		int_type __save_len =  _M_pback_end_save - _M_pback_cur_save;
+		int_type __pback_len = _M_in_cur - _M_pback;
+		__ret = __save_len - __pback_len;
+	      }
+	    else
+	      __ret = this->egptr() - this->gptr();
+	  }
+	else
+	  __ret = this->showmanyc();
+	return __ret;
+      }
+
+      int_type 
+      snextc()
+      {
+	int_type __eof = traits_type::eof();
+	return (this->sbumpc() == __eof ? __eof : this->sgetc()); 
+      }
+
+      int_type 
+      sbumpc();
+
+      int_type 
+      sgetc()
+      {
+	int_type __ret;
+	if (_M_in_cur && _M_in_cur < _M_in_end)
+	  __ret = traits_type::to_int_type(*(this->gptr()));
+	else 
+	  __ret = this->underflow();
+	return __ret;
+      }
+
+      streamsize 
+      sgetn(char_type* __s, streamsize __n)
+      { return this->xsgetn(__s, __n); }
+
+      // Putback:
+      int_type 
+      sputbackc(char_type __c);
+
+      int_type 
+      sungetc();
+
+      // Put area:
+      int_type 
+      sputc(char_type __c);
+
+      streamsize 
+      sputn(const char_type* __s, streamsize __n)
+      { return this->xsputn(__s, __n); }
+
+    protected:
+      basic_streambuf()
+      : _M_buf(NULL), _M_buf_size(0), 
+      _M_buf_size_opt(static_cast<int_type>(BUFSIZ)), _M_buf_unified(false), 
+      _M_in_beg(0), _M_in_cur(0), _M_in_end(0), _M_out_beg(0), _M_out_cur(0), 
+      _M_out_end(0), _M_mode(ios_base::openmode(0)), _M_buf_locale(locale()), 
+      _M_buf_locale_init(false), _M_pback_size(1), _M_pback(NULL), 
+      _M_pback_cur_save(NULL), _M_pback_end_save(NULL), _M_pback_init(false)
+      { }
+
+      // Get area:
+      char_type* 
+      eback() const { return _M_in_beg; }
+
+      char_type* 
+      gptr()  const { return _M_in_cur;  }
+
+      char_type* 
+      egptr() const { return _M_in_end; }
+
+      void 
+      gbump(int __n) { _M_in_cur += __n; }
+
+      void 
+      setg(char_type* __gbeg, char_type* __gnext, char_type* __gend)
+      {
+	_M_in_beg = __gbeg;
+	_M_in_cur = __gnext;
+	_M_in_end = __gend;
+	if (!(_M_mode & ios_base::in) && __gbeg && __gnext && __gend)
+	  _M_mode = _M_mode | ios_base::in;
+      }
+
+      // Put area:
+      char_type* 
+      pbase() const { return _M_out_beg; }
+
+      char_type* 
+      pptr() const { return _M_out_cur; }
+
+      char_type* 
+      epptr() const { return _M_out_end; }
+
+      void 
+      pbump(int __n) { _M_out_cur += __n; }
+
+      void 
+      setp(char_type* __pbeg, char_type* __pend)
+      { 
+	_M_out_beg = _M_out_cur = __pbeg; 
+	_M_out_end = __pend; 
+	if (!(_M_mode & ios_base::out) && __pbeg && __pend)
+	  _M_mode = _M_mode | ios_base::out;
+      }
+
+      // Virtual functions:
+      // Locales:
+      virtual void 
+      imbue(const locale& __loc) 
+      { 
+	_M_buf_locale_init = true;
+	if (_M_buf_locale != __loc)
+	  _M_buf_locale = __loc;
+      }
+
+      // Buffer management and positioning:
+      virtual basic_streambuf<char_type,_Traits>* 
+      setbuf(char_type*, streamsize)
+      {	return this; }
+      
+      virtual pos_type 
+      seekoff(off_type, ios_base::seekdir,
+	      ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out)
+      { return pos_type(off_type(-1)); } 
+
+      virtual pos_type 
+      seekpos(pos_type, 
+	      ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out)
+      { return pos_type(off_type(-1)); } 
+
+      virtual int 
+      sync() { return 0; }
+
+      // Get area:
+      virtual streamsize 
+      showmanyc() { return 0; }
+
+      virtual streamsize 
+      xsgetn(char_type* __s, streamsize __n);
+
+      virtual int_type 
+      underflow()
+      { return traits_type::eof(); }
+
+      virtual int_type 
+      uflow() 
+      {
+	int_type __ret = traits_type::eof();
+	bool __testeof = this->underflow() == __ret;
+	bool __testpending = _M_in_cur && _M_in_cur < _M_in_end;
+	if (!__testeof && __testpending)
+	  {
+	    __ret = traits_type::to_int_type(*_M_in_cur);
+	    ++_M_in_cur;
+	    if (_M_buf_unified && _M_mode & ios_base::out)
+	      ++_M_out_cur;
+	  }
+	return __ret;    
+      }
+
+      // Putback:
+      virtual int_type 
+      pbackfail(int_type /* __c */  = traits_type::eof())
+      { return traits_type::eof(); }
+
+      // Put area:
+      virtual streamsize 
+      xsputn(const char_type* __s, streamsize __n);
+
+      virtual int_type 
+      overflow(int_type /* __c */ = traits_type::eof())
+      { return traits_type::eof(); }
+
+#ifdef _GLIBCPP_DEPRECATED
+    public:
+      void 
+      stossc() 
+      {
+	if (_M_in_cur < _M_in_end) 
+	  ++_M_in_cur;
+	else 
+	  this->uflow();
+      }
+#endif
+
+#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
+    private:
+      basic_streambuf(const __streambuf_type&);
+
+      __streambuf_type& 
+      operator=(const __streambuf_type&);
+#endif
+    };
+
+} // namespace std
+
+#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
+# define export
+#ifdef  _GLIBCPP_FULLY_COMPLIANT_HEADERS
+#include <bits/streambuf.tcc>
+#endif
+#endif
+
+#endif	/* _CPP_STREAMBUF */
+