File size information in C

Hey, /prog/

When you have a pointer to a FILE structure, what's the standard way of determining the size (in bytes) of the open file?

https://www.securecoding.cert.org/confluence/display/seccode/PRE07-C.+Avoid+using+repeated+question+marks


size_t i = /* some initial value */;
/* assignment of i */
if (i > 9000) {
   if (puts("Over 9000!?""?!") == EOF) {
     /* Handle Error */
   }
}

Fucking /b/ is everywhere