[Haskell-cafe] FFI binding -- different behaviour under
compilation and interpretation.
daniel.is.fischer at web.de
Fri Nov 13 19:15:26 EST 2009
Am Samstag 14 November 2009 00:00:36 schrieb Jason Dusek:
> I'm binding to `wcwidth` to determine the column widths of
> various Unicode characters. I noticed a lot of -- in fact all
> -- Chinese characters were being given widths of `-1` when of
> course they should have width `2`. This only showed up when I
> compiled my program though -- within GHCi, it never happened.
It seems that ghci calls setlocale(LC_ALL,"") or similar, while the compiled code doesn't.
I've no idea why that would be, but
dafis at linux-mkk1:~/Haskell/CafeTesting> cat locl.h
dafis at linux-mkk1:~/Haskell/CafeTesting> cat locl.c
main = do
(sequence_ . fmap (UTF8.putStrLn . uncurry fmt)) widths
foreign import ccall unsafe "locl.h sloc" setloc :: IO ()
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