2003-02-04  Paolo Carlini  <pcarlini@unitus.it>

	PR libstdc++/9439, PR libstdc++/9425
	* config/io/basic_file_stdio.cc
	(__basic_file<char>::seekoff, seekpos): Return -1L if
	fseek fails.
	* include/bits/fstream.tcc (basic_filebuf::seekoff):
	Check _M_file.seekoff return value; always return
	pos_type(off_type(-1)) in case of failure.
	(basic_filebuf::pbackfail): Check this->seekoff return
	value and return traits_type::eof() in case of failure.
	* testsuite/27_io/filebuf_virtuals.cc (test09): Add.

From-SVN: r62408