anr2me · September 16, 2021 20:25 · Mar 16, 2011
diff --git a/mac.c b/mac.c
@@ -0,0 +1,39 @@
+/**
+ * @brief Some useful C functions to manage mac addresses
+ * @file
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <limits.h>
+
+/** Convert hex mac address to uint64_t
+ *  @param[in] hwaddr hex mac address
+ *  @return mac address as uint64_t
+ */
+uint64_t mac2int(const uint8_t hwaddr[])
+{
+    int8_t i;
+    uint64_t ret = 0;
+    const uint8_t *p = hwaddr;
+
+    for (i = 5; i >= 0; i--) {
+        ret |= (uint64_t) *p++ << (CHAR_BIT * i);
+    }
+
+    return ret;
+}
+
+/** Convert uint64_t mac address to hex
+ * @param[in] mac uint64_t mac address
+ * @param[out] hwaddr hex mac address
+ */
+void int2mac(const uint64_t mac, uint8_t *hwaddr)
+{
+    int8_t i;
+    uint8_t *p = hwaddr;
+
+    for (i = 5; i >= 0; i--) {
+        *p++ = mac >> (CHAR_BIT * i);
+    }
+}