How can I interface myself with the C preprocessor?

[Matteo Fioroni]

Hi,
 I need to write a program that can interface itself
with the C preprocessor.
On the Internet I've found a lot of documentation, but
all on the C compiler and other layer of Gcc (SAT
ecc.).
 I have to use the preprocessor to retrieve the
inforfations about "#pragmas" in the C code.
I think that I can use the preprocessore features to
"scan" the code I can obtain the informations I need
in a good way.

So, I ask you how can I get some docomuntation about C
preprocessor and how can I interface myself with it?

Thaks for Help.

Matteo.

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