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path: root/lib/libalpm/alpm_list.c
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Diffstat (limited to 'lib/libalpm/alpm_list.c')
-rw-r--r--lib/libalpm/alpm_list.c86
1 files changed, 53 insertions, 33 deletions
diff --git a/lib/libalpm/alpm_list.c b/lib/libalpm/alpm_list.c
index 3f9525e8..4cab665f 100644
--- a/lib/libalpm/alpm_list.c
+++ b/lib/libalpm/alpm_list.c
@@ -287,6 +287,53 @@ alpm_list_t SYMEXPORT *alpm_list_msort(alpm_list_t *list, size_t n, alpm_list_fn
/**
* @brief Remove an item from the list.
+ * item is not freed; this is the respnsiblity of the caller.
+ *
+ * @param haystack the list to remove the item from
+ * @param item the item to remove from the list
+ *
+ * @return the resultant list
+ */
+alpm_list_t SYMEXPORT *alpm_list_remove_item(alpm_list_t *haystack,
+ alpm_list_t *item)
+{
+ if(haystack == NULL || item == NULL) {
+ return(haystack);
+ }
+
+ if(item == haystack) {
+ /* Special case: removing the head node which has a back reference to
+ * the tail node */
+ haystack = item->next;
+ if(haystack) {
+ haystack->prev = item->prev;
+ }
+ item->prev = NULL;
+ } else if(item == haystack->prev) {
+ /* Special case: removing the tail node, so we need to fix the back
+ * reference on the head node. We also know tail != head. */
+ if(item->prev) {
+ /* i->next should always be null */
+ item->prev->next = item->next;
+ haystack->prev = item->prev;
+ item->prev = NULL;
+ }
+ } else {
+ /* Normal case, non-head and non-tail node */
+ if(item->next) {
+ item->next->prev = item->prev;
+ }
+ if(item->prev) {
+ item->prev->next = item->next;
+ }
+ }
+
+ return(haystack);
+}
+
+
+/**
+ * @brief Remove an item from the list.
*
* @param haystack the list to remove the item from
* @param needle the data member of the item we're removing
@@ -295,9 +342,10 @@ alpm_list_t SYMEXPORT *alpm_list_msort(alpm_list_t *list, size_t n, alpm_list_fn
*
* @return the resultant list
*/
-alpm_list_t SYMEXPORT *alpm_list_remove(alpm_list_t *haystack, const void *needle, alpm_list_fn_cmp fn, void **data)
+alpm_list_t SYMEXPORT *alpm_list_remove(alpm_list_t *haystack,
+ const void *needle, alpm_list_fn_cmp fn, void **data)
{
- alpm_list_t *i = haystack, *tmp = NULL;
+ alpm_list_t *i = haystack;
if(data) {
*data = NULL;
@@ -312,44 +360,16 @@ alpm_list_t SYMEXPORT *alpm_list_remove(alpm_list_t *haystack, const void *needl
i = i->next;
continue;
}
- tmp = i->next;
if(fn(i->data, needle) == 0) {
- /* we found a matching item */
- if(i == haystack) {
- /* Special case: removing the head node which has a back reference to
- * the tail node */
- haystack = i->next;
- if(haystack) {
- haystack->prev = i->prev;
- }
- i->prev = NULL;
- } else if(i == haystack->prev) {
- /* Special case: removing the tail node, so we need to fix the back
- * reference on the head node. We also know tail != head. */
- if(i->prev) {
- /* i->next should always be null */
- i->prev->next = i->next;
- haystack->prev = i->prev;
- i->prev = NULL;
- }
- } else {
- /* Normal case, non-head and non-tail node */
- if(i->next) {
- i->next->prev = i->prev;
- }
- if(i->prev) {
- i->prev->next = i->next;
- }
- }
+ haystack = alpm_list_remove_item(haystack, i);
if(data) {
*data = i->data;
}
- i->data = NULL;
free(i);
- i = NULL;
+ break;
} else {
- i = tmp;
+ i = i->next;
}
}