re PR libstdc++/11389 (Unbuffered wfilebuf fails to read single-byte UTF-8 characters.)

re PR libstdc++/11389 (Unbuffered wfilebuf fails to read single-byte UTF-8 characters.)

2003-07-01  Paolo Carlini  <pcarlini@unitus.it>

	PR libstdc++/11389
	* include/bits/fstream.tcc (underflow): For encoding() == 0
	don't read more than __buflen chars.
	* testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-1.cc: New.
	* testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-2.cc: New.
	* testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-3.cc: New.
	* testsuite/27_io/basic_filebuf/underflow/wchar_t/11389-4.cc: New.

From-SVN: r68780