[commit: base] encoding: Bug fixes to Windows code path (5579a1c)

[Ian Lynagh]

Repository : ssh://darcs.haskell.org//srv/darcs/packages/base

On branch  : encoding

http://hackage.haskell.org/trac/ghc/changeset/5579a1c42e0d56aa11bfca72b76d0b1fd332f926

>---------------------------------------------------------------

commit 5579a1c42e0d56aa11bfca72b76d0b1fd332f926
Author: Max Bolingbroke <batterseapower at hotmail.com>
Date:   Tue Apr 5 09:32:38 2011 +0100

    Bug fixes to Windows code path

>---------------------------------------------------------------

 GHC/IO/Encoding/CodePage.hs |    2 +-
 GHC/Windows.hs              |    6 ++++++
 System/Environment.hs       |   12 ++++++------
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/GHC/IO/Encoding/CodePage.hs b/GHC/IO/Encoding/CodePage.hs
index 412c1b3..d9ec11b 100644
--- a/GHC/IO/Encoding/CodePage.hs
+++ b/GHC/IO/Encoding/CodePage.hs
@@ -125,7 +125,7 @@ encodeToSingleByte cfm CompactArray { encoderMax = maxChar,
             | otherwise = do
                 (c,ir') <- readCharBuf iraw ir
                 case lookupCompact maxChar indices values c of
-                    Nothing -> invalid ir'
+                    Nothing -> invalid c ir'
                     Just 0 | c /= '\0' -> invalid c ir'
                     Just b -> do
                         writeWord8Buf oraw ow b
diff --git a/GHC/Windows.hs b/GHC/Windows.hs
index 7f3b30a..2a74a5f 100644
--- a/GHC/Windows.hs
+++ b/GHC/Windows.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude, ForeignFunctionInterface #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  GHC.Windows
@@ -18,7 +19,12 @@
 
 module GHC.Windows where
 
+import GHC.Base
+import GHC.Ptr
+
 import Data.Word
+
+import Foreign.C.Error (throwErrno)
 import Foreign.C.Types
 
 
diff --git a/System/Environment.hs b/System/Environment.hs
index 19f2f1a..67ad1ef 100644
--- a/System/Environment.hs
+++ b/System/Environment.hs
@@ -130,17 +130,17 @@ getEnv :: String -> IO String
 #ifdef mingw32_HOST_OS
 getEnv name = withCWString name $ \s -> do
     size <- c_GetEnvironmentVariable s nullPtr 0
-    try_size size
+    try_size s size
   where
-    try_size size = allocaArray size $ \p_value -> do
+    try_size s size = allocaArray (fromIntegral size) $ \p_value -> do
       res <- c_GetEnvironmentVariable s p_value size
       case res of
         0 -> throwGetLastError "getEnv"
-        _ | res > size -> try_size res -- Rare: size increased between calls to GetEnvironmentVariable
-          | otherwise  -> peekCWString size
+        _ | res > size -> try_size s res -- Rare: size increased between calls to GetEnvironmentVariable
+          | otherwise  -> peekCWString p_value
 
 foreign import stdcall unsafe "windows.h GetEnvironmentVariableW"
-  c_GetEnvironmentVariable :: LPTSTR -> LPTSTR -> DWORD -> IO LPTSTR
+  c_GetEnvironmentVariable :: LPTSTR -> LPTSTR -> DWORD -> IO DWORD
 #else
 getEnv name =
     withCString name $ \s -> do
@@ -231,7 +231,7 @@ getEnvironment = bracket c_GetEnvironmentStrings c_FreeEnvironmentStrings $ \pBl
         if done then return pBlock'
          else do
            c <- peek pBlock'
-           seekNull pBlock' (c == 0)
+           seekNull pBlock' (c == (0 :: Word8 ))
 
 foreign import stdcall unsafe "windows.h GetEnvironmentStringsW"
   c_GetEnvironmentStrings :: IO (Ptr CWchar)