[project @ 1999-06-28 15:16:59 by simonmar]

[ghc-hetmet.git] / ghc / compiler / utils / StringBuffer.lhs

diff --git a/ghc/compiler/utils/StringBuffer.lhs b/ghc/compiler/utils/StringBuffer.lhs
index 1294556..da2a340 100644 (file)
--- a/ghc/compiler/utils/StringBuffer.lhs
+++ b/ghc/compiler/utils/StringBuffer.lhs
@@ -225,21 +225,21 @@ trySlurp handle sz_i chunk =
 
        tAB_SIZE = 8#
 
-       slurpFile :: Int# -> Int# -> Addr -> Int# -> Int# -> IO Int
+       slurpFile :: Int# -> Int# -> Addr -> Int# -> Int# -> IO (Addr, Int)
        slurpFile c off chunk chunk_sz max_off = slurp c off
         where
 
-         slurp :: Int# -> Int# -> IO Int
+         slurp :: Int# -> Int# -> IO (Addr, Int)
          slurp c off | off >=# max_off = do
                let new_sz = chunk_sz *# 2#
                chunk' <- reAllocMem chunk (I# new_sz)
-               slurpFile c off chunk' new_sz (new_sz -# tAB_SIZE)
+               slurpFile c off chunk' new_sz (new_sz -# (tAB_SIZE +# 1#))
          slurp c off = do
                intc <- mayBlock fo (_ccall_ fileGetc fo)
                if intc == ((-1)::Int)
                  then do errtype <- getErrType
                          if errtype == (ERR_EOF :: Int)
-                           then return (I# off)
+                           then return (chunk, I# off)
                            else constructErrorAndFail "slurpFile"
                  else case chr intc of
                         '\t' -> tabIt c off
@@ -248,7 +248,7 @@ trySlurp handle sz_i chunk =
                                            | otherwise  = c +# 1#
                                     slurp c' (off +# 1#)
 
-         tabIt :: Int# -> Int# -> IO Int
+         tabIt :: Int# -> Int# -> IO (Addr, Int)
          -- can't run out of buffer in here, because we reserved an
          -- extra tAB_SIZE bytes at the end earlier.
          tabIt c off = do
@@ -261,12 +261,16 @@ trySlurp handle sz_i chunk =
   in do
 
        -- allow space for a full tab at the end of the buffer
-       -- (that's what the max_off thing is for)
-  rc <- slurpFile 0# 0# chunk chunk_sz (chunk_sz -# tAB_SIZE)
+       -- (that's what the max_off thing is for),
+       -- and add 1 to allow room for the final sentinel \NUL at
+       -- the end of the file.
+  (chunk', rc) <- slurpFile 0# 0# chunk chunk_sz (chunk_sz -# (tAB_SIZE +# 1#))
+#if __GLASGOW_HASKELL__ < 404
   writeHandle handle handle_
+#endif
   if rc < (0::Int)
        then constructErrorAndFail "slurpFile"
-       else return (chunk, rc)
+       else return (chunk', rc+1 {-room for sentinel-})
 
 
 reAllocMem :: Addr -> Int -> IO Addr