stop passing unsanitized inputs to printf(3) challenge 2022
Conversation
this is probably something that crab lang gets better, but i haven't bothered to test it
2
26
answer: yes, 🦀 lang proves it is best lang yet again
1
3
39
This Tweet was deleted by the Tweet author. Learn more
Replying to
oh, good, the `dig` output represents escape characters as decimal, not octal. lovely.
welp, looks like crab-lang could stand to build in some input sanitization for `str`'s fmt::Display impl
3
2
println! isn't an actual function (due to !) but rather a syntax extension parsing the initial string token as a compile-time parameter to generate the code necessary to handle the rest. The additional parameters are simply passed along to the runtime formatting infrastructure.
1
1
It's possible to handle them differently by defining a new string type with a different implementation of the traits for displaying it. I don't think there's anything wrong with the current implementation. It'd likely be bad if it tried to guess how to sanitize for an output.
1
doc.rust-lang.org/reference/proc is documentation on the feature println! is using: procedural macros, also known as proc macros. It's also how custom derive and attribute implementations are made. It allows you to write Rust code run at compile-time to turn one token stream into another.