doc: C<->Rust function table

[zmike]

It would be great if there was some table for showing functional equivalencies for common functions, ie. strdup, strtol, getenv

[larsbergstrom]

This is a common request for people coming from C to Rust. Frankly, I also have to dig through the Rust library sources every time I run into these things.

[lifthrasiir]

I've tried a bit: https://gist.github.com/lifthrasiir/e021349c1d0cd55933a5 (incomplete). How do you think about this?

[steveklabnik]

Given that Rust and C will have different usages, I think a more 'this is how you accomplish x in rust' makes more sense than function<->function

[larsbergstrom]

@lifthrasiir This is absolutely awesome!

@steveklabnik In Servo, we do a lot of work that is either porting C code or we have people with a few decades of C experience and all of those functions hardwired into their brains, so this sort of map is super-useful. "this is how you modify strings in Rust" is not nearly as useful in those scenarios as "what did they decide to call strstr?"

[steveklabnik]

Yeah, I mean, I'm not saying it's not useful at all.

[steveklabnik]

I'm pulling a massive triage effort to get us ready for 1.0. As part of this, I'm moving stuff that's wishlist-like to the RFCs repo, as that's where major new things should get discussed/prioritized.

This issue has been moved to the RFCs repo: rust-lang/rfcs#779