How to modify C file created by mib2c?

Hi all,
I've created .c and .h file using mib2c.
Now i have to modify .
c file in order to make agent capable in reading date and time from my 
pc (this is an example).
Where and how i set instruction to do it in .c 
file?
Can someone give me a VALID LINK to a tutorial explaining how to 
modify .c files generated by mib2c?

Thanks to ALL.

Bye

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