Passing variable number of arguments around

Question

Say I have a C function which takes a variable number of arguments: How can I call another function which expects a variable number of arguments from inside of it, passing a

Answer 1

Let's say you have a typical variadic function you've written. Because at least one argument is required before the variadic one ..., you have to always write an extra argument in usage.

Or do you?

If you wrap your variadic function in a macro, you need no preceding arg. Consider this example:

#define LOGI(...)
    ((void)__android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__))

This is obviously far more convenient, since you needn't specify the initial argument every time.