re PR libstdc++/19955 (Second std::ctype<char>::narrow() does not call std::ctype<char>::do_narrow())

2005-02-15  Paolo Carlini  <pcarlini@suse.de>
	    Jon Grimm  <jgrimm2@us.ibm.com>

	PR libstdc++/19955
	* include/bits/locale_facets.h (ctype<char>::_M_narrow_init()):
	Fix the logic setting _M_narrow_ok: first check whether the
	transformation is trivial with a dflt == 0, then deal with the
	special case of zero.
	* testsuite/22_locale/ctype/narrow/char/19955.cc: New.

	* include/bits/locale_facets.h (ctype<char>::_M_widen_init()):
	Tweak consistently to use memcmp; minor formatting fixes.

Co-Authored-By: Jon Grimm <jgrimm2@us.ibm.com>

From-SVN: r95082