Nanoprintf – The smallest public printf implementation for its feature set

Related:

"Tiny, fast, non-dependent and fully loaded printf implementation for embedded systems":

https://github.com/mpaland/printf

tinyprintf:

https://github.com/cjlano/tinyprintf

I do like the npf_pprintf function with a call-back that is called for each outputted character. It would have been nice to have such a function in the C standard.

Even beter would be an interator interface, that gives you the next character each time it is called.