C documentation

[Deborah Wilbert]

Hi,

I am looking for ways to generate documentation from C source code.
I'm not sure what it can/should do aside from extracting headers and
comments, which would be pretty simple. I would be open to inserting
keywords into the C source comments to format the generated document.

Public domain software would be best. I am also vaguely interested in
other documentation aids, such as static flow analysis tools.

Thanks for any leads,
Deborah Wilbert