Hi everyone! I’m working on a library to expose Kotlin/Native bindings and have a question about ha...

# kotlin-native

[Roberto Leinardi]

Hi everyone!

I’m working on a library to expose Kotlin/Native bindings and have a question about handling variadic C functions on Linux native. Specifically, I’m dealing with functions like these:

C function:

void g_log(const gchar *log_domain, GLogLevelFlags log_level, const gchar *format, ...) G_GNUC_PRINTF(3, 4);

Kotlin/Native cinterop:

fun g_log(log_domain: String?, log_level: Int, format: String?, vararg variadicArguments: Any?): Unit

And:

void g_logv(const gchar *log_domain, GLogLevelFlags log_level, const gchar *format, va_list args) G_GNUC_PRINTF(3, 0);

Kotlin/Native cinterop:

fun g_logv(log_domain: String?, log_level: Int, format: String?, args: CPointer<platform.posix.__va_list_tag>?): Unit

I’m aware of KT-56164, which states that there’s currently no official support. However, I wanted to check here to see if anyone has found a workaround or a way to support these functions, even if it’s a bit hacky.

I’m currently focusing on Linux, so a solution specific to this platform would be fine.

Any insights or advice would be greatly appreciated!

[loke]

You could create a set of wrapper functions, log1, log2, log3, etc. Each taking the appropriate number of arguments.

[loke]

Although I note that the datatypes can differe as well, so that might not be feasible.

[Roberto Leinardi]

yeah I considered but supporting both CPointer and promitive types doesn't seem doable