+ case Metadata_sortkey_position:
+ if (r1->records && r2->records)
+ {
+ int pos1 = 0, pos2 = 0;
+ struct record *rec;
+ for (rec = r1->records; rec; rec = rec->next)
+ if (pos1 == 0 || rec->position < pos1)
+ pos1 = rec->position;
+ for (rec = r2->records; rec; rec = rec->next)
+ if (pos2 == 0 || rec->position < pos2)
+ pos2 = rec->position;
+ if (s->increasing)
+ res = pos1 - pos2;
+ else
+ res = pos2 - pos1;
+ }
+ break;