seek_lanfile

Source: hsio/seek_lanfile.pro

 SEEK_LANFILE 
        Move to location in file immediately before requested time.

 Usage:
        seek_lanfile, findex, year, day, hour, postion

 Arguments:
        findex  Long    input   Index of file, as returned by open_lanfile
        year    long    input   Year (full or mod 100) of required start.
        day     long    input   Day of year required.
        hour    long    input   hour of day.
        position long   output  The location to which the file has been set,
                                or an error code.

 History:
        Placeholder: 25/11/03; SJT