/sys$common/syshlp/HELPLIB.HLB  —  CRTL  ftello  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
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