Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/lib/libalpm/alpm_list.c
diff options
context:
space:
mode:
authorAllan McRae <allan@archlinux.org>2011-07-03 10:10:36 +1000
committerDan McGee <dan@archlinux.org>2011-07-03 13:42:24 -0500
commitab79b13079ea6c0c7b66e4c5d14686f06ba759ae (patch)
treee9489277d1815be0ba0972dc4ee989a1792d5c53 /lib/libalpm/alpm_list.c
parentf612e5ede7f76458911b78adca3323c61a669dd0 (diff)
Add alpm_list_previous method
Helper function to get the previous item in a list Signed-off-by: Allan McRae <allan@archlinux.org> Signed-off-by: Dan McGee <dan@archlinux.org>
Diffstat (limited to 'lib/libalpm/alpm_list.c')
-rw-r--r--lib/libalpm/alpm_list.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/libalpm/alpm_list.c b/lib/libalpm/alpm_list.c
index c2b30adc..1976e13d 100644
--- a/lib/libalpm/alpm_list.c
+++ b/lib/libalpm/alpm_list.c
@@ -556,6 +556,24 @@ inline alpm_list_t SYMEXPORT *alpm_list_next(const alpm_list_t *node)
}
/**
+ * @brief Get the previous element of a list.
+ *
+ * @param list the list head
+ * @param node the list node
+ *
+ * @return the previous element, or NULL when no previous element exist
+ */
+inline alpm_list_t SYMEXPORT *alpm_list_previous(const alpm_list_t *list,
+ const alpm_list_t *node)
+{
+ if(node && node != list) {
+ return node->prev;
+ } else {
+ return NULL;
+ }
+}
+
+/**
* @brief Get the last item in the list.
*
* @param list the list