On Mon, Dec 23, 2013 at 3:54 PM, Jim Meyering <jim@meyering.net> wrote:
...
> Thanks for dotting those 'i's.  While there is no risk of buffer
> overrun, there would definitely be a problem with the tr_TR locale.
> I will resolve it by removing the isascii check and performing
> multibyte case conversion to form each [cC] pair.  Of course,
> that will mean removing the "4 * byte-length-of-search-string"
> buffer size limitation.
>
> I will also add tests based on your examples.

Here is the improved patch.