Fix llist_sorted_difference_inplace in git-pack-redundant

Simplify and actually make llist_sorted_difference_inplace work
by using llist_sorted_remove instead of duplicating parts of the
code.

Signed-off-by: Lukas Sandström <lukass@etek.chalmers.se>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/pack-redundant.c b/pack-redundant.c
index 28b82ee..fcb36ff 100644 (file)
--- a/pack-redundant.c
+++ b/pack-redundant.c
@@ -127,38 +127,6 @@ inline struct llist_item * llist_insert_sorted_unique(struct llist *list,
        return llist_insert_back(list, sha1);
 }
 
-/* computes A\B */
-void llist_sorted_difference_inplace(struct llist *A,
-                                    struct llist *B)
-{
-       struct llist_item *prev, *a, *b, *x;
-
-       prev = a = A->front;
-       b = B->front;
-
-       while (a != NULL && b != NULL) {
-               int cmp = memcmp(a->sha1, b->sha1, 20);
-               if (!cmp) {
-                       x = a;
-                       if (a == A->front)
-                               A->front = a->next;
-                       a = prev->next = a->next;
-
-                       if (a == NULL) /* end of list */
-                               A->back = prev;
-                       A->size--;
-                       free(x);
-                       b = b->next;
-               } else
-                       if (cmp > 0)
-                               b = b->next;
-                       else {
-                               prev = a;
-                               a = a->next;
-                       }
-       }
-}
-
 /* returns a pointer to an item in front of sha1 */
 inline struct llist_item * llist_sorted_remove(struct llist *list, char *sha1,
                                               struct llist_item *hint)
@@ -194,6 +162,21 @@ redo_from_start:
        return prev;
 }
 
+/* computes A\B */
+void llist_sorted_difference_inplace(struct llist *A,
+                                    struct llist *B)
+{
+       struct llist_item *hint, *b;
+
+       hint = NULL;
+       b = B->front;
+
+       while (b) {
+               hint = llist_sorted_remove(A, b->sha1, hint);
+               b = b->next;
+       }
+}
+
 inline struct pack_list * pack_list_insert(struct pack_list **pl,
                                           struct pack_list *entry)
 {