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%
% (c) The GRASP/AQUA Project, Glasgow University, 1998
%
\section[DirUtils]{Directory functions}
\begin{code}
{-# OPTIONS -#include <dirent.h> #-}
module DirUtils
(
getDirectoryContents
) where
#if !defined(__GLASGOW_HASKELL__) || __GLASGOW_HASKELL__ >= 302
import Directory
#else
#if __GLASGOW_HASKELL__ >= 300
import PrelPack ( unpackNBytesST )
#else
import PackBase ( unpackNBytesST )
#endif
import PrimPacked ( strLength )
import GlaExts ( stToIO )
import Addr ( Addr )
\end{code}
The implementation of Directory.getDirectoryContents that ships
with ghc-X ( X<=301) is wrong (the C stub fails to allocate
space for the terminating NUL for each directory entry name.)
To counter for this, we supply a working version here, which will
be nuked once we can assume that ghc-3.02 or later is used to
compile the compiler sources.
\begin{code}
getDirectoryContents :: String -> IO [String]
getDirectoryContents path = do
dir <- _ccall_ opendir path
if dir == ``NULL''
then fail (userError ("DirUtils.getDirectoryContents: couldn't open "++ path))
else loop dir
where
loop :: Addr -> IO [String]
loop dir = do
dirent_ptr <- _ccall_ readdir dir
if (dirent_ptr::Addr) == ``NULL''
then do
_ccall_ closedir dir
return []
else do
str <- _casm_ `` %r=(char*)((struct dirent*)%0)->d_name; '' dirent_ptr
entry <- stToIO (unpackNBytesST str (strLength str))
entries <- loop dir
return (entry:entries)
#endif
\end{code}
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