Is there a way to pass a kotlin vararg to a variadic C function? I'm trying to pass through a print...

# kotlin-native

[Ryan Loebs]

Is there a way to pass a kotlin vararg to a variadic C function? I'm trying to pass through a printf-style log callback to snprintf to do the actual formatting but I've been unable to find a way to do it. At this point I'm thinking of trying a convoluted approach of writing a C method that I can pass as the initial callback that will do the snprintf in C code, then callback into my kotlin code with the final string.

[ephemient]

variadics are hard. https://youtrack.jetbrains.com/issue/KT-42925 & related

[Clocks]

No no no no. I suffered for 2 days figuring it out.

Simply no.

[Clocks]

C does not have vararg pass through

[Clocks]

That's why va_list exists

[Ryan Loebs]

Ahh right, vsprintf. Is it possible to use that with Kotlin/Native? 🙏

[Ryan Loebs]

https://youtrack.jetbrains.com/issue/KT-42973 seems like it's in limbo

[Clocks]

Yes, You can use a vararg function. You just can't pass through a vararg

[Clocks]

You can create a va_list