bpf_trace_printk formatting?

[bithamr]

Looking at the implementation of bpf_trace_printk in redbpf-probes it would seem you can't provide formatting and arguments to it in the same way you can when using libbpf in C. I have a couple of questions relevant to this:

1. how does the bpf_trace_printk function in redbpf-probes/src/helpers.rs actually work, at a more fundamental level? It appears to map to the underlying libbpf library, but it's not clear how?
2. is it currently possible, or would it be feasible to add the formatting that's available in libbpf?

The main reason I ask is because I would like to be able to do some debug logging where I print IP addresses and ports. I currently do this by appending (and unicode converting) to a &[u8] manually and it would be much simpler if I could just use the formatting directives available in libbpf.

Thank you!