+/*
+ * Retrieve the next valid UUID that is free for this server.
+ */
+std::string InspIRCd::GetUID()
+{
+ int i;
+
+ /*
+ * This will only finish once we return a UUID that is not in use.
+ */
+ while (1)
+ {
+ /*
+ * Okay. The rules for generating a UID go like this...
+ * -- > ABCDEFGHIJKLMNOPQRSTUVWXYZ --> 012345679 --> WRAP
+ * That is, we start at A. When we reach Z, we go to 0. At 9, we go to
+ * A again, in an iterative fashion.. so..
+ * AAA9 -> AABA, and so on. -- w00t
+ */
+
+ /* start at the end of the current UID string, work backwards. don't trample on SID! */
+ for (i = UUID_LENGTH - 2; i > 3; i--)
+ {
+ if (current_uid[i] == 'Z')
+ {
+ /* reached the end of alphabetical, go to numeric range */
+ current_uid[i] = '0';
+ }
+ else if (current_uid[i] == '9')
+ {
+ /* we reached the end of the sequence, set back to A */
+ current_uid[i] = 'A';
+
+ /* we also need to increment the next digit. */
+ continue;
+ }
+ else
+ {
+ /* most common case .. increment current UID */
+ current_uid[i]++;
+ }
+
+ if (current_uid[3] == 'Z')
+ {
+ /*
+ * Ugh. We have run out of room.. roll back around to the
+ * start of the UUID namespace. -- w00t
+ */
+ this->InitialiseUID();
+
+ /*
+ * and now we need to break the inner for () to continue the while (),
+ * which will start the checking process over again. -- w00t
+ */
+ break;
+
+ }
+
+ if (this->FindUUID(current_uid))
+ {
+ /*
+ * It's in use. We need to try the loop again.
+ */
+ continue;
+ }
+
+ return current_uid;
+ }
+ }
+
+ /* not reached. */
+ return "";
+}
+
+
+