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-rw-r--r--libopkg/active_list.c33
-rw-r--r--libopkg/active_list.h5
2 files changed, 31 insertions, 7 deletions
diff --git a/libopkg/active_list.c b/libopkg/active_list.c
index 800915d..e297cfc 100644
--- a/libopkg/active_list.c
+++ b/libopkg/active_list.c
@@ -30,26 +30,47 @@ void active_list_init(struct active_list *ptr) {
*/
struct active_list * active_list_next(struct active_list *head, struct active_list *ptr) {
struct active_list *next=NULL;
- if (!head) {
- fprintf(stderr, "active_list_prev head = %p, ptr = %p invalid value!!\n", head, ptr);
+ if ( !head ) {
+ fprintf(stderr, "active_list_next head = %p, ptr = %p invalid value!!\n", head, ptr);
return NULL;
}
- if (!ptr)
+ if ( !ptr )
ptr = head;
next = list_entry(ptr->node.next, struct active_list, node);
- if (next == head ) {
+ if ( next == head ) {
return NULL;
}
- if (ptr->depended && &ptr->depended->depend == ptr->node.next ) {
+ if ( ptr->depended && &ptr->depended->depend == ptr->node.next ) {
return ptr->depended;
}
- while (next->depend.next != &next->depend) {
+ while ( next->depend.next != &next->depend ) {
next = list_entry(next->depend.next, struct active_list, node);
}
return next;
}
+struct active_list * active_list_prev(struct active_list *head, struct active_list *ptr) {
+ struct active_list *prev=NULL;
+ if ( !head ) {
+ fprintf(stderr, "active_list_prev head = %p, ptr = %p invalid value!!\n", head, ptr);
+ return NULL;
+ }
+ if ( !ptr )
+ ptr = head;
+ if ( ptr->depend.prev != &ptr->depend ) {
+ prev = list_entry(ptr->depend.prev, struct active_list, node);
+ return prev;
+ }
+ if ( ptr->depended && ptr->depended != head && &ptr->depended->depend == ptr->node.prev ) {
+ prev = list_entry(ptr->depended->node.prev, struct active_list, node);
+ } else
+ prev = list_entry(ptr->node.prev, struct active_list, node);
+ if ( prev == head )
+ return NULL;
+ return prev;
+}
+
void active_list_clear(struct active_list *head) {
}
diff --git a/libopkg/active_list.h b/libopkg/active_list.h
index 79ab77d..262164a 100644
--- a/libopkg/active_list.h
+++ b/libopkg/active_list.h
@@ -26,10 +26,13 @@ struct active_list {
struct active_list *depended;
};
-struct active_list * active_list_next(struct active_list *head, struct active_list *ptr);
void active_list_init(struct active_list *ptr);
void active_list_clear(struct active_list *head);
void active_list_add_depend(struct active_list *node, struct active_list *depend);
void active_list_add(struct active_list *head, struct active_list *node);
+struct active_list * active_list_next(struct active_list *head, struct active_list *ptr);
+
+struct active_list * active_list_prev(struct active_list *head, struct active_list *ptr);
+
#endif