[PATCH] _wctomb_r mishandles invalid wchars in single byte mode

[Eric Blake]

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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.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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