std_fstream.h (_M_destroy_pback): Use _M_in_beg instead of unnecessarily taking the address of _M_pback.

2003-06-02  Paolo Carlini  <pcarlini@unitus.it>

	* include/std/std_fstream.h (_M_destroy_pback): Use _M_in_beg
	instead of unnecessarily taking the address of _M_pback.
	(xsgetn): Simplify slightly for a single char pback buffer.

2003-06-02  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/sstream.tcc (seekoff): Remove four unnecessary
	variables and two 'if', clean up.

2003-06-02  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/sstream.tcc (seekpos): Test against _M_out_lim
	not _M_out_end, since the former actually points to the string
	end (vs buffer end).
	* testsuite/27_io/basic_stringbuf/seekpos/char/3.cc: New.

From-SVN: r67334