C / C++ / MFC

int _wsprintf( LPTSTR lpOut, LPCTSTR lpFmt, ... )
{
    // you know how many arguments there are and their type
    // based on the number of '%' in the format specifier
    
    return (wsprintf(lpOut, lpFmt, var1, var2, etc));
}

int _wsprintf( LPTSTR lpOut, LPCTSTR lpFmt, ... )
{
    va_list list;
    int nReturn;
 
    va_start(list, lpFmt);
    nReturn = wsprintf(lpOut, lpFmt, list);
    va_end(list);
 
    return nReturn;
}

#include <windows.h>
#include <tchar.h>
#include <stdio.h>

int MyWsprintf( LPTSTR lpOut, LPCTSTR lpFmt, ...) 
{	 
	va_list list;	  
	int	nReturn;	 
	va_start(list, lpFmt);	  
	nReturn	= wsprintf(lpOut, lpFmt, list);	   
	va_end(list);	  
	return nReturn;
}


int _tmain(int argc, _TCHAR* argv[])
{
	char buf[1024];

	MyWsprintf(buf, "%s %s %s", "test1", "test2", "test3");

	printf(buf);
}
</code>

void DLLHookFunc(etc., wsprintf);
//then later do this
wsprintf(parameter1, ...);

int w_printf(
int r, /* row */
int c, /* column */
int color,/* color */
unsigned flags, /* formating flags */
const char *format, /* format (see printf())
... /* variable arguments */
)
{
	int n=-1;
	char *buf=NULL;
	size_t size=0;
	va_list ap;
	va_start( ap,format );
	while( n == -1 ) {
		size += 128;								/* change size */
		if( buf ) free(buf);						/* free old buffer */
		buf = (char *)malloc(size); 				/* allocate new buffer */
		if( !buf ) n = 0;							/* allocation failer */
		else n = _vsnprintf(buf,size,format,ap);	/* do basic formating */
	}
	va_end(ap);
	if( buf ) {
		n = w_pfmt( r,c,color,flags,buf );
		free(buf);
	}
	return n;
}