sscanf and octals

Question

Why wouldn't it just work?

const char* ip =  "192.168.1.4";
unsigned int ip4[4];
sscanf(ip,"%o.%o.%o.%o",ip4,ip4+1,ip4+2,ip4+3); // doesn't work
sscanf(ip,"%d.%d.%d.%d",ip4,ip4+1,ip4+2,ip4+3); // works

I checked man pages for scanf(3) and it clearly states that %o is perfectly acceptable.

Answer 1

There is no "8" and "9" in octal, so 192 and 168 aren't octal numbers, so sscanf can't parse them as octal numbers.