tool for listing C functions used in source code?

What are some good tools for searching source code that can list all the
standard libc functions used?

For example, I'd like to point it at some code and have it tell me that it
uses:

strftime 1 time
isatty 1
setlocale 1
getuid 1
getbsize 5
strlen 25
et cetera

Then I could see what the most used functions are for some research I am
doing.

Does anyone know of a tool that can do that?

I am testing cscope, but it doesn't appear to behave like I want. I do
like how it looks at the includes though. I don't want it to be
interactive. I just want a list of all functions used. I can use sort and
uniq to count if needed.

Next I'll look at cflow. But I am not sure if does what I want either.

 Jeremy C. Reed

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