2007-03-30  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/31401
	* include/bits/basic_string.tcc (find(const _CharT*, size_type,
	size_type)): Avoid unsigned overflow.
	* testsuite/21_strings/basic_string/find/char/4.cc: New.
	* testsuite/21_strings/basic_string/find/wchar_t/4.cc: Likewise.

From-SVN: r123361