return mprintf("%.*s", j, zIP);

is correct? It's been a long time having programmed in C, but I think you should use i instead of j (j will be 2 at most).

rwilson added on 2009-12-29 18:16:42:
i think you are correct. it should be i. as is, this code will always return the first two chars of the ip address.

static char *ipPrefix(const char *zIP){
  int i, j;
  for(i=j=0; zIP[i]; i++){
    if( zIP[i]=='.' ){
      j++;
      if( j==2 ) break;
    }
  }
  return mprintf("%.*s", j, zIP);
}

drh added on 2009-12-29 20:53:21:
See check-in [5d16ca43f192].