the parser in the C runtime can now detect incomplete sentences just like the parser in the Haskell runtime. This is also reflected in all bindings.

src/runtime/haskell-bind/PGF2/FFI.hs

@@ -2,7 +2,7 @@
 
 module PGF2.FFI where
 
-import Foreign ( alloca, poke )
+import Foreign ( alloca, peek, poke )
 import Foreign.C
 import Foreign.Ptr
 import Foreign.ForeignPtr
@@ -116,6 +116,19 @@ peekUtf8CString ptr =
         else do cs <- decode pptr
                 return (((toEnum . fromEnum) x) : cs)
 
+peekUtf8CStringLen :: CString -> CInt -> IO String
+peekUtf8CStringLen ptr len =
+  alloca $ \pptr ->
+    poke pptr ptr >> decode pptr (ptr `plusPtr` fromIntegral len)
+  where
+    decode pptr end = do
+      ptr <- peek pptr
+      if ptr >= end
+        then return []
+        else do x <- gu_utf8_decode pptr
+                cs <- decode pptr end
+                return (((toEnum . fromEnum) x) : cs)
+
 newUtf8CString :: String -> Ptr GuPool -> IO CString
 newUtf8CString s pool = do
   -- An UTF8 character takes up to 6 bytes. We allocate enough