#include <string>
#include <cstdio>
#include <cstdarg>

int sprintf (std::string &dest, const char *fmt, ...)
{
	int len;
	va_list ap;

	if (dest.capacity () > dest.length ()) {
		dest.resize (dest.capacity ());
	}

	va_start (ap, fmt);
	len = vsnprintf (const_cast<char *> (dest.c_str ()), dest.capacity (),
	                 fmt, ap);
	va_end (ap);

	if (len > 0 && static_cast<size_t> (len) >= dest.capacity ()) {
		dest.resize (len + 1);
		va_start (ap, fmt);
		len = vsnprintf (const_cast<char *> (dest.c_str ()),
		                 dest.capacity (), fmt, ap);
		va_end (ap);
	}

	dest.resize (len);

	return len;
}

int main ()
{
	std::string r;
	int len;

	len = sprintf (r, "%i %s %i", 32, "kokot", 23);
	printf ("%i %s %i\n", len, r.c_str (), r.length ());
	return 0;
}