fstream.tcc (close): Clean up a bit.

2003-06-10  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/fstream.tcc (close): Clean up a bit.

	* include/bits/streambuf.tcc (sbumpc): Clean up a bit.

	* include/std/std_fstream.h (_M_destroy_pback): _M_pback_cur_save
	- the saved _M_in_cur, that is - cannot be null.
	(sync): Constify a variable.

	* include/std/std_streambuf.h: Tweak a comment.
	(in_avail): Constify a variable.

From-SVN: r67738

libstdc++-v3/ChangeLog

+2003-06-10  Paolo Carlini  <pcarlini@unitus.it>
+
+	* include/bits/fstream.tcc (close): Clean up a bit.
+
+	* include/bits/streambuf.tcc (sbumpc): Clean up a bit.
+
+	* include/std/std_fstream.h (_M_destroy_pback): _M_pback_cur_save
+	- the saved _M_in_cur, that is - cannot be null.
+	(sync): Constify a variable.
+
+	* include/std/std_streambuf.h: Tweak a comment.
+	(in_avail): Constify a variable.
+
 2003-06-10  Phil Edwards  <pme@gcc.gnu.org>
 
 	* docs/html/17_intro/BUGS:  Update from 2.90.8 snapshot.

libstdc++-v3/include/bits/fstream.tcc

@@ -120,13 +120,12 @@ namespace std
 	  bool __testfail = false;
 	  try
 	    {
-	      const int_type __eof = traits_type::eof();
 	      const bool __testput = this->_M_out_beg < this->_M_out_lim;
 
 	      if (__testput 
-		  && traits_type::eq_int_type(this->overflow(), __eof))
+		  && traits_type::eq_int_type(this->overflow(),
+					      traits_type::eof()))
 		__testfail = true;
-
 #if 0
 	      // XXX not done
 	      if (_M_last_overflowed)

libstdc++-v3/include/bits/streambuf.tcc

@@ -47,9 +47,8 @@ namespace std
       int_type __ret;
       if (_M_in_cur < _M_in_end)
 	{
-	  char_type __c = *this->_M_in_cur;
+	  __ret = traits_type::to_int_type(*this->_M_in_cur);
 	  _M_move_in_cur(1);
-	  __ret = traits_type::to_int_type(__c);
 	}
       else 
 	__ret = this->uflow();

libstdc++-v3/include/std/std_fstream.h

@@ -191,8 +191,7 @@ namespace std
 	if (_M_pback_init)
 	  {
 	    // Length _M_in_cur moved in the pback buffer.
-	    if (_M_pback_cur_save)
-	      _M_pback_cur_save += this->_M_in_cur != this->_M_in_beg;
+	    _M_pback_cur_save += this->_M_in_cur != this->_M_in_beg;
 	    this->setg(this->_M_buf, _M_pback_cur_save, _M_pback_end_save);
 	    _M_pback_init = false;
 	  }
@@ -373,7 +372,7 @@ namespace std
 	if (__testput)
 	  {
 	    // Need to restore current position after the write.
-	    off_type __off = this->_M_out_cur - this->_M_out_lim;
+	    const off_type __off = this->_M_out_cur - this->_M_out_lim;
 
 	    // _M_file.sync() will be called within.
 	    if (traits_type::eq_int_type(this->overflow(), traits_type::eof()))

libstdc++-v3/include/std/std_streambuf.h

@@ -181,7 +181,7 @@ namespace std
        *  @if maint
        *  setp (and _M_set_buffer(0) in basic_filebuf) set it equal to
        *  _M_out_beg, then at each put operation it may be moved
-       *  forward (toward _M_out_end) by _M_out_cur_move.
+       *  forward (toward _M_out_end) by _M_move_out_cur.
        *  @endif
       */      
       char_type*                _M_out_lim;    // End limit of used put area.
@@ -328,7 +328,7 @@ namespace std
       streamsize 
       in_avail() 
       { 
-	streamsize __ret = _M_in_end - _M_in_cur;
+	const streamsize __ret = _M_in_end - _M_in_cur;
 	return __ret ? __ret : this->showmanyc();
       }