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authorAurelien Foret <aurelien@archlinux.org>2005-05-03 17:24:20 +0000
committerAurelien Foret <aurelien@archlinux.org>2005-05-03 17:24:20 +0000
commit9177ce7962ee14ca86c3da3f5c46b3ab611a521d (patch)
tree4fe608a93fda5afe52b1bd82ed3b3eb1e2bdf61e /lib
parent220c084770895353fd8fecb774da1631a5e82ed3 (diff)
reimplemented list_remove to deal with lists of any kind of data
Diffstat (limited to 'lib')
-rw-r--r--lib/libalpm/list.c91
-rw-r--r--lib/libalpm/list.h2
2 files changed, 48 insertions, 45 deletions
diff --git a/lib/libalpm/list.c b/lib/libalpm/list.c
index 056337da..9d3f4005 100644
--- a/lib/libalpm/list.c
+++ b/lib/libalpm/list.c
@@ -44,9 +44,10 @@ int _alpm_list_check(PMList* list)
}
for(it = list; it && it->next; it = it->next);
- if(it != list->last) {
- return(0);
- }
+
+ if(it != list->last) {
+ return(0);
+ }
return(1);
}
@@ -155,56 +156,57 @@ PMList* pm_list_add_sorted(PMList *list, void *data, pm_fn_cmp fn)
return(list);
}
-/* list: the beginning of the list
- * item: the item in the list to be removed
- *
- * returns:
- * list with item removed
+/* Remove an item in a list. Use the given comparaison function to find the
+ * item.
+ * If the item is found, 'data' is pointing to the removed element.
+ * Otherwise, it is set to NULL.
+ * Return the new list (without the removed element).
*/
-
-PMList* _alpm_list_remove(PMList* list, PMList* item)
+PMList *_alpm_list_remove(PMList *haystack, void *needle, pm_fn_cmp fn, void **data)
{
- assert(_alpm_list_check(list));
+ PMList *i = haystack;
- if(list == NULL || item == NULL) {
- return(NULL);
+ if(data) {
+ *data = NULL;
}
- /* Remove first item in list. */
- if(item == list) {
- if(list->next == NULL) { /* Only item in list. */
- pm_list_free(item);
- return(NULL);
- } else {
- list->next->prev = NULL;
- list->next->last = list->last;
- list = list->next;
- item->prev = item->next = NULL;
- pm_list_free(item);
- return(list);
+ while(i) {
+ if(i->data == NULL) {
+ continue;
}
+ if(fn(needle, i->data) == 0) {
+ break;
+ }
+ i = i->next;
}
- /* Remove last item in list. */
- if(list->last == item) {
- list->last = item->prev;
- item->prev->next = NULL;
- item->prev = item->next = NULL;
- pm_list_free(item);
- return(list);
- }
-
- /* Remove middle item in list. */
- assert(item->prev != NULL && item->next != NULL);
-
- item->prev->next = item->next;
- item->next->prev = item->prev;
- item->prev = item->next = NULL;
- pm_list_free(item);
+ if(i) {
+ /* we found a matching item */
+ if(i->next) {
+ i->next->prev = i->prev;
+ }
+ if(i->prev) {
+ i->prev->next = i->next;
+ }
+ if(i == haystack) {
+ /* The item found is the first in the chain */
+ if(haystack->next) {
+ haystack->next->last = haystack->last;
+ }
+ haystack = haystack->next;
+ } else if(i == haystack->last) {
+ /* The item found is the last in the chain */
+ haystack->last = i->prev;
+ }
- assert(_alpm_list_check(list));
+ if(data) {
+ *data = i->data;
+ }
+ i->data = NULL;
+ free(i);
+ }
- return(list);
+ return(haystack);
}
int pm_list_count(PMList *list)
@@ -245,8 +247,9 @@ PMList *pm_list_is_strin(char *needle, PMList *haystack)
PMList* pm_list_last(PMList *list)
{
- if (list == NULL)
+ if(list == NULL) {
return(NULL);
+ }
assert(list->last != NULL);
diff --git a/lib/libalpm/list.h b/lib/libalpm/list.h
index 307aff35..35bacd00 100644
--- a/lib/libalpm/list.h
+++ b/lib/libalpm/list.h
@@ -50,7 +50,7 @@ PMList *pm_list_new();
void pm_list_free(PMList *list);
PMList *pm_list_add(PMList *list, void *data);
PMList *pm_list_add_sorted(PMList *list, void *data, pm_fn_cmp fn);
-PMList* _alpm_list_remove(PMList* list, PMList* item);
+PMList *_alpm_list_remove(PMList *haystack, void *needle, pm_fn_cmp fn, void **data);
int pm_list_count(PMList *list);
int pm_list_is_in(void *needle, PMList *haystack);
PMList *pm_list_is_strin(char *needle, PMList *haystack);