libstdc++/3860: Writing wide string to wide stream segfaults

[bkoz@gcc.gnu.org]

Synopsis: Writing wide string to wide stream segfaults

State-Changed-From-To: analyzed->feedback
State-Changed-By: bkoz
State-Changed-When: Thu Feb  7 17:49:24 2002
State-Changed-Why:
    Please try this now, after:
    
    002-02-07  Benjamin Kosnik  <bkoz@redhat.com>
    
    	libstdc++/5286
    	libstdc++/3860
    	* include/std/std_fstream.h (filebuf::__file_type): Change to
    	__basic_file<char>.
    	(filebuf::_M_convert_to_external): Declare.
    	* include/bits/fstream.tcc (filebuf::_M_convert_to_external): Define
    	codecvt bits for wide streams.
    	(filebuf::_M_really_overflow): Use it.
    	(filebuf::underflow): Use codecvt.
    	* config/locale/codecvt_specializations_ieee_1003.1-200x.h: 
    	(codecvt<__enc_traits>::do_out): Deal with partial.
    	(codecvt<__enc_traits>::do_encoding): Return something useful.
    	* src/codecvt.cc (codecvt<wchar_t>::do_encoding): Return sizeof
    	wchar_t.
    	* testsuite/22_locale/codecvt_members_unicode_char.cc (test01):
    	Change expected encoding output.
    	(test02): Same.
    	* testsuite/22_locale/codecvt_members_wchar_t_char.cc (test01): Same.
    	(test02): Same.

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