Flex and Bison

I am writing a compiler/interpreter to run in an embedded microcomputer. I am considering using flex/bison. The user's program will already be in ram when the parser is called. How do I modify the generated code to read from ram instead of from a file? I have not generated any c code from flex/bison so I do not know if I can modify the get character routines or how ever they get the input for the scanner. Any ideas/direction would be greatly appreciated. Thank you. Alvin...
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