1 files changed, 28 insertions, 0 deletions
diff --git a/testsuite/tests/lib/IO/hGetPosn001.hs b/testsuite/tests/lib/IO/hGetPosn001.hs
new file mode 100644
index 0000000000..5a0d7d4827
--- /dev/null
+++ b/testsuite/tests/lib/IO/hGetPosn001.hs
@@ -0,0 +1,28 @@
+-- !!! Test file positioning
+
+module Main(main) where
+
+import Control.Monad
+import System.Directory (removeFile, doesFileExist)
+import System.IO
+import System.IO.Error
+
+main = do
+  hIn <- openFile "hGetPosn001.in" ReadMode
+  f <- doesFileExist "hGetPosn001.out"
+  when f (removeFile "hGetPosn001.out")
+  hOut <- openFile "hGetPosn001.out" ReadWriteMode
+  bof <- hGetPosn hIn
+  putStrLn (show bof)  -- you can show HandlePosns
+  copy hIn hOut
+  hSetPosn bof
+  copy hIn hOut
+  hSeek hOut AbsoluteSeek 0
+  stuff <- hGetContents hOut
+  putStr stuff
+
+copy :: Handle -> Handle -> IO ()
+copy hIn hOut =
+    try (hGetChar hIn) >>=
+    either (\ err -> if isEOFError err then return () else error "copy")
+	   ( \ x -> hPutChar hOut x >> copy hIn hOut)