I needed to do this today, and it took me a while to google it, so here is complete sample showing how it's done:


// How to pass a variadic argument list to another function
// Justin

#include "iostream"
#include "stdarg.h"

using namespace std;

void debugMessageHelper(char *buffer, const char* format, va_list arglist)
{
 vsprintf(buffer, format, arglist);
} 

void debugMessage(char *buffer, const char* format, ...)
{
 va_list arg;
 va_start(arg, format);

 debugMessageHelper(buffer, format, arg);

 va_end(arg);
} 

int main(int argc, char *argv[])
{
 char testBuffer[128];
 
 debugMessage(testBuffer, "hello %s %u %-04.2f", "world", 21 33.122f);

 cout << "\'" << testBuffer << "\'" << endl;

}