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In the late '90s I was searching the internet for C routines to handle TCP/IP based networking and stumbled across this code. The license was liberal enough so I downloaded it and ported it to VMS. I found a few bugs and reported them back to Charles. He thanked me, and life continued on. The original web site disappeared and I didn't think anything about that.
Interesting enough, I found a bug in the nix routines and decided to report it. So 25 years later I searched to see if Charles and libgpl still existed. Low and behold, they do. They are now located here:
The code is being maintained and extended. The nix routines have been supplanted, so my bug report was not needed. But I sent a nice message to Charles to let him know that I was still using his code.
Note: This code has been modified from the original code and it is not the complete release. It is just the stuff that I could use on VMS. So don't bother Charles with bug reports.
Each of the sub directories has a .txt file. Each of the code modules has extensive comments. This is how we did it back in the "old days". So if you want to know how to use the code, you need to read the code.