2002-01-08  Benjamin Kosnik  <bkoz@redhat.com>

        libstdc++/2913
        libstdc++/4879
	* include/bits/fstream.tcc (filebuf::_M_really_overflow): Test
	return value of _M_file->sync().
	(filebuf::showmanyc): Check for is_open.
	* include/std/fstream (filebuf::sync): Tweak.
	* testsuite/27_io/filebuf.cc: Tweak.

2002-01-08  John Fardo  <jfardo@laurelnetworks.com>
	    Brad Garcia  <garsh@attbi.com>

	* testsuite/27_io/filebuf_members.cc: Add test.

From-SVN: r48654