Description

   The ftello function is identical to the ftell function, except
   that the return value is of type off_t instead of long int.

   The off_t data type is either a 64-bit or 32-bit integer. The 64-
   bit interface allows for file sizes greater than 2 GB, and can be
   selected at compile time by defining the _LARGEFILE feature-test
   macro as follows:

   CC/DEFINE=_LARGEFILE