Use CAString FFI functions instead of CString ones

[batterseapower]

Haskeline uses Foreign.C.String.*CString to marshal locale names. Locale names will always be encoded in ASCII, so it would probably be prudent to use the *CAString variants instead to prevent use of the locale encoding from screwing things up.

Attached patch achieves this.

[judah]

Thanks for the patch! Out of curiosity, do you know of any pending plans to switch over the Foreign.C.String functions to use the locale's encoding? (My understanding is that currently the CString and CAString functions behave the same.)

Either way, though, this patch seems fine to apply.

[batterseapower]

Yes, I'm working on doing it :-). I've been checking GHC and its boot libraries for suspicious use of the *CString functions hence this patch.

[judah]

Ah, that explains it. :-) I've applied the patch to the repo at http://code.haskell.org/haskeline. Thanks again!