Are you sure you are not over-extending the request of your friend?

Looking at the content is difficult:

• not every C-file needs main()
• not every C-file includes stdio.h

The idea to compile the file to see if it runs will also lead to problems:

• what if it is a C-file, which however contains a syntax-error? Probably it should be listed nevertheless...
• what if the C-file needs some non-standard compile options (and compiling fails if you don't provide them?)
• what if it is a simple C++ - program/file, which however compiles with C?

Therefore I would just look at the extensions .c and .h (and possible additional relevant extensions for your domain).

HTH, Rata

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