Re: [Haskell-cafe] Detecting system endianness

Actually, this is probably safer: import Foreign.Marshal.Alloc import Foreign.Ptr import Foreign.Storable import Data.Word import System.IO.Unsafe endianCheck = unsafePerformIO $ alloca $ \p -> poke p (0x01020304 :: Word32) >> peek (castPtr p :: Ptr Word8) littleEndian = endianCheck == 4 bigEndian = endianCheck == 1 -- ryan On Thu, Dec 18, 2008 at 4:33 AM, Ryan Ingram wrote:

I think something like this might work:

Prelude GHC.Exts GHC.Word> let W64# x = 0x100000002 in W32# (unsafeCoerce# x) 2

You should get 1 for big-endian and 2 for little-endian.

(Disclaimer: not particularily well-tested.)

-- ryan

On Thu, Dec 18, 2008 at 3:27 AM, Mauricio wrote:

...

Hi,

Is there some way I can check the endianness of the machine my haskell code is running in?

Thanks, Maurício

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