Skip to content

Implement byteStringToCStringFun via byteStringToCStringFunIO #22

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Implement byteStringToCStringFun via byteStringToCStringFunIO #22

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 1 addition & 7 deletions src/FFI/Anything/TypeUncurry/Msgpack.hs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -131,16 +131,10 @@ byteStringToMallocedCStringWith64bitLength bs =

-- * Exporting

-- TODO implement via byteStringToCStringFunIO?
-- | Transforms a 'ByteString'-mapping function to 'CString'-mapping function
-- for use in the FFI.
byteStringToCStringFun :: (ByteString -> ByteString) -> CString -> IO CString
byteStringToCStringFun f cs = do
msgLength :: Int64 <- peekBE (castPtr cs)
cs_bs <- BS.packCStringLen (cs `plusPtr` 8, fromIntegral msgLength)
let res_bs = f cs_bs
res_cs <- byteStringToMallocedCStringWith64bitLength res_bs
return res_cs
byteStringToCStringFun f cs = byteStringToCStringFunIO (return . f) cs


-- | Transforms a 'ByteString'-mapping 'IO' function to 'CString'-mapping function
Expand Down