[Haskell-beginners] while loop

[PICCA Frederic-Emmanuel]

Hello,

I am playing with FFI and I need to extract from a  C API a list of pointers.

I have two methods available

c_get_first_item :: Ptr List -> IO (Ptr Item)
c_get_next_item :: Ptr List -> Ptr Item -> IO (Ptr Item)

I would like to obtain a [Ptr Item]

I try to used whileM but I did not find how to inject the first item in the loop.

whileM (return . ( /= nullPtr)) (c_get_next_item list item)

the c_get_next_item return a nullPtr when there is no remaining item.

what is the haskell way in order to extract a list of pointer using these C methods ?

thanks for your help

Frederic