natFileDescriptorWin32.cc (read): Return -1 if zero bytes read and no failure code returned.

2002-03-09  Adam Megacz  <adam@xwt.org>

        * java/io/natFileDescriptorWin32.cc (read): Return -1 if zero
        bytes read and no failure code returned.

From-SVN: r50519

libjava/java/io/natFileDescriptorWin32.cc

@@ -255,6 +255,7 @@ java::io::FileDescriptor::read(jbyteArray buffer, jint offset, jint count)
   if (! ReadFile((HANDLE)fd, bytes, count, &read, NULL))
     throw new IOException (JvNewStringLatin1 (winerr ()));
 
+  if (read == 0) return -1;
   return (jint)read;
 }