Re: [stdc++] Re: basic_stringbuf functional

[Benjamin Kosnik <bkoz@cygnus.com>]

Here is your code with some changes. Please use diff -cp on the next
submission, because it's easier for me (and equivalent to what egcs
uses.) 

I don't have any problems compiling this code with this version of egcs:
gcc version egcs-2.92.21 19981118 (gcc2 ss-980609 experimental)
are you running into difficulty with some other version? 

-Benjamin


Index: sstream.tcc
===================================================================
RCS file: /cvs/cvsfiles/unsupported/isolib/bits/sstream.tcc,v
retrieving revision 1.1
diff -c -p -r1.1 sstream.tcc
*** sstream.tcc	1998/10/16 02:36:55	1.1
--- sstream.tcc	1998/12/02 22:27:22
***************
*** 1,4 ****
--- 1,5 ----
  // String based streams -*- C++ -*-
+ // sstream.tcc
  
  // Copyright (C) 1997,1998 Cygnus Solutions
  //
***************
*** 19,24 ****
--- 20,27 ----
  
  namespace std {
  
+ #if 0
+   //981201 bkoz orig
    template <class _CharT, class _Traits, class _Allocator>
      basic_stringbuf<_CharT,_Traits,_Allocator>::basic_stringbuf(
          const basic_string<_CharT,_Traits,_Allocator>& __str,
*************** namespace std {
*** 58,64 ****
--- 61,176 ----
      if (_M_mode & ios_base::in)
        this->setg (this->pbase (), this->pptr (), this->epptr ());
    }
+ #endif
  
+   //981201 bkoz this is new
+   template <class _CharT, class _Traits, class _Allocator>
+     void
+     basic_stringbuf<_CharT,_Traits,_Allocator>::
+       str (const basic_string<_CharT,_Traits,_Allocator>& __s)
+   { 
+     _M_str = __s;
+     // position setting
+     _M_writeindex = _M_str.length();
+     _M_readindex = 0;
+   }
+ 
+   template <class _CharT, class _Traits, class _Allocator>
+     basic_stringbuf<_CharT,_Traits,_Allocator>::int_type 
+     basic_stringbuf<_CharT,_Traits,_Allocator>::
+       underflow ()
+   { 
+     if (_M_readindex>=_M_str.length()) 
+       return _Traits::eof();
+     return _Traits::to_int_type(_M_str[_M_readindex++]);
+   }
+ 
+   template <class _CharT, class _Traits, class _Allocator>
+     basic_stringbuf<_CharT,_Traits,_Allocator>::int_type
+     basic_stringbuf<_CharT,_Traits,_Allocator>::
+       overflow (int_type __c)
+   { 
+     if (!_Traits::eq_int_type(__c,_Traits::eof()))
+       { 
+ 	if (_M_writeindex>=_M_str.size()) 
+ 	  _M_str.resize(_M_writeindex+1);
+ 	_M_str[_M_writeindex++]=__c;
+ 	return __c;
+       }
+     else 
+       return _Traits::not_eof(__c);
+   }
+ 
+   template <class _CharT, class _Traits, class _Allocator>
+     streamsize
+     basic_stringbuf<_CharT,_Traits,_Allocator>::
+       xsputn (const char_type* __s, streamsize __n)
+   { 
+     if (_M_writeindex + __n > _M_str.size()) 
+       _M_str.resize(_M_writeindex + __n);
+     copy(__s, __s + __n, _M_str.begin() + _M_writeindex);
+     _M_writeindex += __n;
+     return __n;
+   }
+ 
+   template <class _CharT, class _Traits, class _Allocator>
+     streamsize
+     basic_stringbuf<_CharT,_Traits,_Allocator>::
+       xsgetn (char_type* __s, streamsize __n)
+   { 
+     if (_M_readindex + __n > _M_str.length()) 
+   	__n = _M_str.length() - _M_readindex;
+     copy(_M_str.begin() + _M_readindex, 
+          _M_str.begin() + (_M_readindex + __n), 
+          __s);
+     _M_readindex += __n;
+     return __n;
+   }
+   
+   template <class _CharT, class _Traits, class _Allocator>
+     int
+     basic_stringbuf<_CharT,_Traits,_Allocator>::showmanyc()
+     { 
+       return _M_str.length() - _M_readindex;
+     }
+ 
+   template <class _CharT, class _Traits, class _Allocator>
+     basic_stringbuf<_CharT,_Traits,_Allocator>::pos_type
+     basic_stringbuf<_CharT,_Traits,_Allocator>::
+       seekoff(off_type __off, ios_base::seekdir __way,
+       		ios_base::openmode __which)
+     { 
+       pos_type __retval = -1;
+ 
+       if (__which & ios_base::in)
+ 	{  
+ 	  switch (__way)
+ 	    {  
+ 	    case ios_base::beg: 
+ 	      __retval = _M_readindex = __off;
+ 	    case ios_base::cur:
+ 	      __retval = _M_readindex += __off;
+ 	    case ios_base::end:
+ 	      __retval = _M_readindex = _M_str.size() + __off;
+ 	    }
+ 	}
+ 
+       if (__which & ios_base::out)
+ 	{  
+ 	  switch (__way)
+ 	    {  
+ 	    case ios_base::beg: 
+ 	      __retval = _M_writeindex = __off;
+ 	    case ios_base::cur:
+ 	      __retval = _M_writeindex += __off;
+ 	    case ios_base::end:
+ 	      __retval = _M_writeindex = _M_str.size() + __off;
+ 	    }
+ 	}
+       return __retval; // don't know whether this is right
+     }
+ 
+   
  } // namespace std
  
  #endif	/* _CPP_SSTREAM_TCC */