Switch to side-by-side view

--- a/libupnpp/getsyshwaddr.c
+++ b/libupnpp/getsyshwaddr.c
@@ -56,6 +56,10 @@
 
 #include "getsyshwaddr.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define MACADDR_IS_ZERO(x) \
   ((x[0] == 0x00) && \
    (x[1] == 0x00) && \
@@ -186,6 +190,10 @@
 	return ret;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 /* Local Variables: */
 /* mode: c++ */
 /* c-basic-offset: 4 */