re PR libstdc++/20806 (basic_filebuf::xsgetn()  fails with text mode and DOS line endings and large buffers)

2005-04-08  Danny Smith  <dannysmith@users.sourceforge.net>
	    Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/20806
	* config/os/mingw32/os_defines.h: Define
	_GLIBCXX_HAVE_DOS_BASED_FILESYSTEM.
	* config/os/newlib/os_defines.h: Likewise, for __CYGWIN__.
	* include/bits/fstream.tcc (basic_filebuf<>::showmanyc()):
	Use it.
	(basic_filebuf<>::xsgetn(_CharT*, streamsize)): Likewise.

Co-Authored-By: Paolo Carlini <pcarlini@suse.de>

From-SVN: r97842