I can't find it, but I remember seeing a linked list library for C, which supported a functional style like Lisp. I don't know how closely it was related to S-e

I can't find it, but I remember seeing a linked list library for C, which supported a functional style like Lisp. I don't know how closely it was related to S-expressions, but I'd be interested if somebody could help me remember what I'm thinking of here.