getArgs, -- :: IO [String]
getProgName, -- :: IO String
getEnv, -- :: String -> IO String
-#ifdef __GLASGOW_HASKELL__
+#ifndef __NHC__
withArgs,
withProgName,
#endif
+#ifdef __GLASGOW_HASKELL__
+ getEnvironment,
+#endif
) where
import Prelude
-import System.IO ( bracket )
#ifdef __GLASGOW_HASKELL__
+import Data.List
import Foreign
import Foreign.C
+import Control.Exception ( bracket )
import Control.Monad
import GHC.IOBase
#endif
-- ---------------------------------------------------------------------------
-- getArgs, getProgName, getEnv
--- Computation `getArgs' returns a list of the program's command
+-- | Computation 'getArgs' returns a list of the program's command
-- line arguments (not including the program name).
#ifdef __GLASGOW_HASKELL__
isPathSeparator :: Char -> Bool
isPathSeparator '/' = True
-#ifdef mingw32_TARGET_OS
+#ifdef mingw32_HOST_OS
isPathSeparator '\\' = True
#endif
isPathSeparator _ = False
--- Computation `getEnv var' returns the value
--- of the environment variable {\em var}.
-
--- This computation may fail with
--- NoSuchThing: The environment variable does not exist.
+-- | Computation 'getEnv' @var@ returns the value
+-- of the environment variable @var@.
+--
+-- This computation may fail with:
+--
+-- * 'System.IO.Error.isDoesNotExistError' if the environment variable
+-- does not exist.
getEnv :: String -> IO String
getEnv name =
c_getenv :: CString -> IO (Ptr CChar)
{-|
-@withArgs args act@ - while executing action @act@, have 'System.getArgs'
+'withArgs' @args act@ - while executing action @act@, have 'getArgs'
return @args@.
-}
+withArgs :: [String] -> IO a -> IO a
withArgs xs act = do
p <- System.Environment.getProgName
withArgv (p:xs) act
{-|
-@withProgName name act@ - while executing action @act@, have 'System.getProgName'return @name@.
+'withProgName' @name act@ - while executing action @act@,
+have 'getProgName' return @name@.
-}
+withProgName :: String -> IO a -> IO a
withProgName nm act = do
xs <- System.Environment.getArgs
withArgv (nm:xs) act
-- Worker routine which marshals and replaces an argv vector for
-- the duration of an action.
+withArgv :: [String] -> IO a -> IO a
withArgv new_args act = do
pName <- System.Environment.getProgName
existing_args <- System.Environment.getArgs
setArgs :: [String] -> IO (Ptr CString)
setArgs argv = do
vs <- mapM newCString argv >>= newArray0 nullPtr
- setArgsPrim (length argv) vs
+ setArgsPrim (genericLength argv) vs
return vs
foreign import ccall unsafe "setProgArgv"
- setArgsPrim :: Int -> Ptr CString -> IO ()
+ setArgsPrim :: CInt -> Ptr CString -> IO ()
+
+-- |'getEnvironment' retrieves the entire environment as a
+-- list of @(key,value)@ pairs.
+--
+-- If an environment entry does not contain an @\'=\'@ character,
+-- the @key@ is the whole entry and the @value@ is the empty string.
+
+getEnvironment :: IO [(String, String)]
+getEnvironment = do
+ pBlock <- getEnvBlock
+ if pBlock == nullPtr then return []
+ else do
+ stuff <- peekArray0 nullPtr pBlock >>= mapM peekCString
+ return (map divvy stuff)
+ where
+ divvy str =
+ case break (=='=') str of
+ (xs,[]) -> (xs,[]) -- don't barf (like Posix.getEnvironment)
+ (name,_:value) -> (name,value)
+
+foreign import ccall unsafe "__hscore_environ"
+ getEnvBlock :: IO (Ptr CString)
#endif /* __GLASGOW_HASKELL__ */