[PATCH] _wctomb_r mishandles invalid wchars in single byte mode

[Jeff Johnston]

Eric Blake wrote:
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> According to Corinna Vinschen on 2/27/2009 3:11 AM:
>   
>> Hi,
>>
>> right now the _wctomb_r function simply assumes that the incoming wchar
>> is a single byte value if the current multibyte charset is a singlebyte
>> charset.  This is wrong.  Per POSIX, wctomb "shall return -1 if the
>> value of wchar does not correspond to a valid character".  Per
>> POSIX.1-2008, wctomb should also set errno to EILSEQ.  The below patch
>> fixes that.
>>     
>
> wctomb.c needs the same fix when !_MB_CAPABLE.
>
>   
Done.  Thanks for noting this.
> - --
> Don't work too hard, make some time for fun as well!
>
> Eric Blake             ebb9@byu.net
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