Thread: variable number of arguments for a function or a macro

I need to give a unique interface for different implementations of outputs for different platforms. To do this i need to define a prototype with a variable number of arguments in the end like printf() but i don't know : how to do this?

It should be something like this:

Code:

int SPRINTF(char * string, const char * FormatString, void * arg1, void * arg2,..)
{
     #if LINUX
          snprintf(string, sizeof(string), FormatString, *arg1, *arg2,..);
     #else if WINDOWSCE
          sprintf(string, FormatString, *arg1, *arg2,..);
     #endif

}

man stdarg

That's all there is to it. It is actually quite simple to understand how to do it. You'll define your function as

Code:

int printf(const char *fmt, ...)

then you'll define a va_list and go from there.

Originally Posted by Kennedy

man stdarg

That's all there is to it. It is actually quite simple to understand how to do it. You'll define your function as

Code:

int printf(const char *fmt, ...)

then you'll define a va_list and go from there.

I am afraid I don't understand. If i write the dots I suppose i get a compiler error.. My code specified was actually pseudocode. How to reference the vars then? What is a va_list?

Originally Posted by mynickmynick

I am afraid I don't understand. If i write the dots I suppose i get a compiler error.. My code specified was actually pseudocode. How to reference the vars then? What is a va_list?

Google (above) has the answers or just type MAN STDARG from the command line (if you are on a *nix box) or put MAN STDARG into your favorite search engine.