re PR libstdc++/10097 (filebuf::underflow drops characters.)

re PR libstdc++/10097 (filebuf::underflow drops characters.)

2003-03-17  Paolo Carlini  <pcarlini@unitus.it>
	    Petur Runolfsson  <peturr02@ru.is>

	PR libstdc++/10097
	* src/fstream.cc (basic_filebuf<char>::_M_underflow_common,
	basic_filebuf<wchar_t>::_M_underflow_common):
	if (gptr() < egptr()) return *gptr().
	* testsuite/27_io/filebuf_virtuals.cc (test16): Add.

	* testsuite/27_io/filebuf_members.cc (test_04): Minor
	changes: unlink fifo before making it, fix spelling error.

Co-Authored-By: Petur Runolfsson <peturr02@ru.is>
From-SVN: r64509