netif: add functions to get and get by identifier

miri64 · miri64 · commit 4ef741febcf7 · 2019-11-18T14:06:47.000+01:00
diff --git a/sys/include/net/netif.h b/sys/include/net/netif.h
@@ -89,6 +89,16 @@ netif_t *netif_iter(netif_t *last);
 
 int netif_get_name(netif_t *netif, char *name);
 
+/**
+ * @brief   Gets the numeric identifier of an interface
+ *
+ * @param[in] netif A network interface.
+ *
+ * @return  The numeric identifier of an interface
+ * @return  -1 if @p netif is not registered
+ */
+int16_t netif_get_id(const netif_t *netif);
+
 /**
  * @brief   Gets interface by name
  *
@@ -103,6 +113,16 @@ int netif_get_name(netif_t *netif, char *name);
  */
 netif_t *netif_get_by_name(const char *name);
 
+/**
+ * @brief   Gets interface by a numeric identifier.
+ *
+ * @param[in] id  A numeric identifier.
+ *
+ * @return  The interface on success.
+ * @return  NULL if no interface with identifier @p id.
+ */
+netif_t *netif_get_by_id(int16_t id);
+
 /**
  * @brief   Gets option from an interface
  *
diff --git a/sys/net/netif/netif.c b/sys/net/netif/netif.c
@@ -40,6 +40,17 @@ netif_t *netif_iter(netif_t *last)
     return (netif_t *)last->node.next;
 }
 
+int16_t netif_get_id(const netif_t *netif)
+{
+    list_node_t *node = netif_list.next;
+    for (int16_t i = 0; node; i++, node = node->next) {
+        if (netif == (netif_t *)node) {
+            return i;
+        }
+    }
+    return -1;
+}
+
 netif_t *netif_get_by_name(const char *name)
 {
     assert(name);
@@ -57,4 +68,16 @@ netif_t *netif_get_by_name(const char *name)
 
     return NULL;
 }
+
+int16_t netif_get_by_id(int16_t netif)
+{
+    list_node_t *node = netif_list.next;
+    for (int16_t i = 0; node; i++, node = node->next) {
+        if (i == id) {
+            return (netif_t *)node;
+        }
+    }
+    return -1;
+}
+
 /** @} */
