Harald Welte has submitted this change and it was merged.
Change subject: linuxlist.h: add llist_first/last_entry macros
......................................................................
linuxlist.h: add llist_first/last_entry macros
Copy list_first_entry, list_first_entry_or_null and list_last_entry from
current linux kernel's tools/include/linux/list.h and rename to llist_*.
Slightly adjust API doc but stay as close to the source as possible.
This can replace similar implementations in osmo-bts-octphy's l1_if.c,
in openbsc's gtphub.c and in osmo-hlr's gsup_server.c.
Change-Id: I4eac5be0c0b2cede04464c4c3a0873102d952453
---
M include/osmocom/core/linuxlist.h
1 file changed, 30 insertions(+), 0 deletions(-)
Approvals:
Harald Welte: Looks good to me, approved
Jenkins Builder: Verified
diff --git a/include/osmocom/core/linuxlist.h b/include/osmocom/core/linuxlist.h
index affa827..7d85077 100644
--- a/include/osmocom/core/linuxlist.h
+++ b/include/osmocom/core/linuxlist.h
@@ -215,6 +215,36 @@
#define llist_entry(ptr, type, member) \
container_of(ptr, type, member)
+/*! \brief Get the first element from a list
+ * \param ptr the list head to take the element from.
+ * \param type the type of the struct this is embedded in.
+ * \param member the name of the list_head within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define llist_first_entry(ptr, type, member) \
+ llist_entry((ptr)->next, type, member)
+
+/*! \brief Get the last element from a list
+ * \param ptr the list head to take the element from.
+ * \param type the type of the struct this is embedded in.
+ * \param member the name of the llist_head within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define llist_last_entry(ptr, type, member) \
+ llist_entry((ptr)->prev, type, member)
+
+/*! \brief Get the first element from a list, or NULL
+ * \param ptr the list head to take the element from.
+ * \param type the type of the struct this is embedded in.
+ * \param member the name of the list_head within the struct.
+ *
+ * Note that if the list is empty, it returns NULL.
+ */
+#define llist_first_entry_or_null(ptr, type, member) \
+ (!llist_empty(ptr) ? llist_first_entry(ptr, type, member) : NULL)
+
/*! \brief Iterate over a linked list
* \param pos The \ref llist_head to use as a loop counter
* \param head The head of the list over which to iterate
--
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Gerrit-MessageType: merged
Gerrit-Change-Id: I4eac5be0c0b2cede04464c4c3a0873102d952453
Gerrit-PatchSet: 2
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <[email protected]>
Gerrit-Reviewer: Harald Welte <[email protected]>
Gerrit-Reviewer: Jenkins Builder
