[msgb] Add msgb_reset to reset an existing msgb* to the initial state
The reset is useful if one msgb is supposed to be used over and
over again and is avoiding to use msgb_free,msgb_alloc in the
application code.
diff --git a/openbsc/include/openbsc/msgb.h b/openbsc/include/openbsc/msgb.h
index 5ecac45..ab3c033 100644
--- a/openbsc/include/openbsc/msgb.h
+++ b/openbsc/include/openbsc/msgb.h
@@ -51,6 +51,7 @@
extern void msgb_free(struct msgb *m);
extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
extern struct msgb *msgb_dequeue(struct llist_head *queue);
+extern void msgb_reset(struct msgb *m);
#define msgb_l2(m) ((void *)(m->l2h))
#define msgb_l3(m) ((void *)(m->l3h))
diff --git a/openbsc/src/msgb.c b/openbsc/src/msgb.c
index 52edf2d..edeb975 100644
--- a/openbsc/src/msgb.c
+++ b/openbsc/src/msgb.c
@@ -74,6 +74,26 @@
return llist_entry(lh, struct msgb, list);
}
+void msgb_reset(struct msgb *msg)
+{
+ msg->len = 0;
+ msg->len = 0;
+ msg->data = msg->_data;
+
+ msg->head = msg->data;
+ msg->data = msg->data;
+ /* reset tail pointer */
+ msg->tail = msg->data;
+
+ /* reset pointers */
+ msg->bts_link = NULL;
+ msg->trx = NULL;
+ msg->lchan = NULL;
+ msg->l2h = NULL;
+ msg->l3h = NULL;
+ msg->smsh = NULL;
+}
+
static __attribute__((constructor)) void on_dso_load_trau_msgb(void)
{
tall_msgb_ctx = talloc_named_const(tall_bsc_ctx, 1, "msgb");