From 3b58de0a825c99820a8e1abae9d3e587cd679bf9 Mon Sep 17 00:00:00 2001 From: Simon Marlow Date: Tue, 13 Jul 2010 13:25:15 +0000 Subject: [PATCH] add cast{C,U}CharToChar and castCharTo{C,U}Char, from Haskell 2010 --- Foreign/C/String.hs | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/Foreign/C/String.hs b/Foreign/C/String.hs index 2fb14d0..680c81a 100644 --- a/Foreign/C/String.hs +++ b/Foreign/C/String.hs @@ -59,6 +59,11 @@ module Foreign.C.String ( -- representation of strings in C castCharToCChar, -- :: Char -> CChar castCCharToChar, -- :: CChar -> Char + castCharToCUChar, -- :: Char -> CUChar + castCUCharToChar, -- :: CUChar -> Char + castCharToCSChar, -- :: Char -> CSChar + castCSCharToChar, -- :: CSChar -> Char + peekCAString, -- :: CString -> IO String peekCAStringLen, -- :: CStringLen -> IO String newCAString, -- :: String -> IO CString @@ -199,6 +204,26 @@ castCCharToChar ch = unsafeChr (fromIntegral (fromIntegral ch :: Word8)) castCharToCChar :: Char -> CChar castCharToCChar ch = fromIntegral (ord ch) +-- | Convert a C @unsigned char@, representing a Latin-1 character, to +-- the corresponding Haskell character. +castCUCharToChar :: CUChar -> Char +castCUCharToChar ch = unsafeChr (fromIntegral (fromIntegral ch :: Word8)) + +-- | Convert a Haskell character to a C @unsigned char@. +-- This function is only safe on the first 256 characters. +castCharToCUChar :: Char -> CUChar +castCharToCUChar ch = fromIntegral (ord ch) + +-- | Convert a C @signed char@, representing a Latin-1 character, to the +-- corresponding Haskell character. +castCSCharToChar :: CSChar -> Char +castCSCharToChar ch = unsafeChr (fromIntegral (fromIntegral ch :: Word8)) + +-- | Convert a Haskell character to a C @signed char@. +-- This function is only safe on the first 256 characters. +castCharToCSChar :: Char -> CSChar +castCharToCSChar ch = fromIntegral (ord ch) + -- | Marshal a NUL terminated C string into a Haskell string. -- peekCAString :: CString -> IO String -- 1.7.10.4