NAME
    SetFileSize -- Sets the size of a file (V36)

SYNOPSIS
    newsize = SetFileSize(fh, offset, mode)
    D0                    D1    D2     D3

    LONG SetFileSize(BPTR, LONG, LONG)

FUNCTION
    Changes the file size, truncating or extending as needed.  Not all
    handlers may support this; be careful and check the return code.  If
    the file is extended, no values should be assumed for the new bytes.
    If the new position would be before the filehandle's current position
    in the file, the filehandle will end with a position at the
    end-of-file.  If there are other filehandles open onto the file, the
    new size will not leave any filehandle pointing past the end-of-file.
    You can check for this by looking at the new size.

    Do NOT count on any specific values to be in the extended area.

INPUTS
    fh     - File to be truncated/extended.
    offset - Offset from position determined by mode.
    mode   - One of OFFSET_BEGINNING, OFFSET_CURRENT, or OFFSET_END.

RESULT
    newsize - position of new end-of-file or -1 for error.

SEE ALSO
    seek()