Importing standard cell area into .lib file automatically.

Hi,

I am working on a standard cell design. Once I do the characterization, I am noticing that the cell area = '0'. To avoid this, I am manually calculating the area of my cell and entering into the userdata.lib and read the same at the time of characterizing my cell.

When I go for a larger number of cells, how do I automate this?

OR

How do I read the area information from a lef file and write it to the userdata.lib automatically?

-Baranidharan