secury swprintf without crt

[ig3v10]

Hi ,
need advice on the folloing situation:

wchar_t* day = new wchar_t [11];
swprintf(day,L"%4d-%2d-%2d",yy,mm,dd);

how to make sure that my 'day' didn't get string bigger then 11 chars?

found:

swprintf_s(day,size,L"%4d-%2d-%2d",yy,mm,dd);
but it requires crt

any suggestions?

~igRek