re PR libstdc++/13582 (basic_filebuf::imbue drops characters)

re PR libstdc++/13582 (basic_filebuf::imbue drops characters)

2004-01-11  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/13582
	* include/bits/fstream.tcc (imbue): Exploit the external
	buffer to imbue 'on the fly' a new locale and convert its
	remainder with the new codecvt facet.
	(underflow): Tweak slightly to deal with this special case.
	* testsuite/27_io/basic_filebuf/imbue/char/13582-2.cc: New.
	* testsuite/27_io/basic_filebuf/imbue/wchar_t/13582-2.cc: Ditto.
	* testsuite/27_io/basic_filebuf/imbue/wchar_t/13582-3.cc: Ditto.
	* testsuite/27_io/objects/wchar_t/13582-1_xin.cc: Ditto.
	* testsuite/27_io/objects/wchar_t/13582-1_xin.in: Ditto.

From-SVN: r75677