+ /* Bail out if we can't generate a message ID */
+ if (msg == NULL) {
+ return(0);
+ }
+ if (msg->cm_fields['I'] == NULL) {
+ return(0);
+ }
+ if (strlen(msg->cm_fields['I']) == 0) {
+ return(0);
+ }
+
+ /* Generate the message ID */
+ strcpy(msgid, msg->cm_fields['I']);
+ if (haschar(msgid, '@') == 0) {
+ strcat(msgid, "@");
+ if (msg->cm_fields['N'] != NULL) {
+ strcat(msgid, msg->cm_fields['N']);
+ }
+ else {
+ return(0);
+ }
+ }
+
+ /* Compare to the existing list */
+ for (uptr = ut; uptr != NULL; uptr = uptr->next) {
+ if (!strcasecmp(msgid, uptr->message_id)) {
+ return(1);
+ }
+ }
+
+ /* If we got to this point, it's unique: add it. */
+ uptr = (struct UseTable *)
+ mallok(sizeof(struct UseTable));
+ if (uptr == NULL) return(0);
+ uptr->next = ut;
+ uptr->message_id = strdoop(msgid);
+ uptr->timestamp = time(NULL);
+ ut = uptr;
+ return(0);
+
+ case UT_SAVE:
+ /* Figure out how big the serialized buffer should be */
+ stlen = 0;
+ for (uptr = ut; uptr != NULL; uptr = uptr->next) {
+ stlen = stlen + strlen(uptr->message_id) + 20;
+ }
+ serialized_table = mallok(stlen);
+
+ while (ut != NULL) {
+ if (serialized_table != NULL) {
+ sprintf(&serialized_table[strlen(
+ serialized_table)], "%s|%ld\n",
+ ut->message_id,
+ ut->timestamp);
+ }
+
+ /* Now free the memory */
+ uptr = ut;
+ ut = ut->next;
+ phree(uptr->message_id);
+ phree(uptr);
+ }
+
+ /* Write to disk */
+ CtdlPutSysConfig(USETABLE, serialized_table);
+ phree(serialized_table);
+ return(0);