How to resolve hiccups by patch program?

[SF Markus Elfring]

> In any case, patchutils is not involved.
>   
Well, you are right. - But I hope that your tool box can help to extract 
code places that might be problematic.

Application of your tools:
1. I want to look at a specific patch that is a part of a bigger file.
$ filterdiff -i 'app_adsiprog.c' < const4.patch

2. I have tried an example that is provided in your manual.
http://man-wiki.net/index.php/1:filterdiff
$ filterdiff -i '*.c' --lines=-5 < const4.patch

I don't get any output from those commands. Do I make a mistake here?

Regards,
Markus