re PR libstdc++/38678 ([DR XXX] istream::read() calls streambuf::sgetn())

re PR libstdc++/38678 ([DR XXX] istream::read() calls streambuf::sgetn())

2009-01-01  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/38678
	* include/std/istream (basic_istream<>::_M_read): New.
	* include/bits/istream.tcc (basic_istream<>::_M_read): Define.
	(basic_istream<>::read, basic_istream<>::readsome): Use it.
	* include/std/ostream (basic_ostream<>::_M_write_): New.
	(basic_ostream<>::_M_write): Adjust.
	* include/bits/ostream.tcc (basic_ostream<>::_M_write_): Define.
	* testsuite/27_io/basic_istream/read/char/38678.cc: New.
	* testsuite/27_io/basic_istream/read/wchar_t/38678.cc: Likewise.
	* testsuite/27_io/basic_ostream/write/char/38678.cc: Likewise.
	* testsuite/27_io/basic_ostream/write/wchar_t/38678.cc: Likewise.

From-SVN: r142994