void safevoid_vsnprintf(char* s, size_t n, const char *format, va_list ap) { 
	int res;
	
	if(!s || n <= 0)
		return;
	
	// If the format string is empty, nothing to do.
	if(!format || !*format) {
		s[0]=0;
		return;
	}
	
	res = vsnprintf(s, n, format, ap);
	
	if(res < 0 || res >= n)
		s[n-1]=0;
}