[Haskell-cafe] runST $ unsafeIOToST $ ioWhatever

[Henning Thielemann]

On Sun, 14 Apr 2024, Folsk Pratima wrote:

>    tryIOString :: CSize -> IO (Maybe String)
>    tryIOString size =
>        allocaBytes (fromIntegral size) $ \ptr -> do
>            zeroptr <- memSet ptr 0 (fromIntegral size)

You may instead do

   withArray (replicate (fromIntegral size) 0) $ \ptr -> do
     st <- c_strerror_r (fromIntegral errnum) ptr size
     ...