core: add macros NM_FLAGS_HAS(), NM_FLAGS_ANY() and NM_FLAGS_ALL()

Signed-off-by: Thomas Haller <thaller@redhat.com>

src/NetworkManagerUtils.h

@@ -38,6 +38,15 @@ int nm_spawn_process (const char *args);
 /* macro to return strlen() of a compile time string. */
 #define STRLEN(str)     ( sizeof ("" str) - 1 )
 
+/* check if @flags has exactly one flag (@check) set. You should call this
+ * only with @check being a compile time constant and a power of two. */
+#define NM_FLAGS_HAS(flags, check)  \
+    ( (G_STATIC_ASSERT_EXPR ( ((check) != 0) && ((check) & ((check)-1)) == 0 )), (NM_FLAGS_ANY ((flags), (check))) )
+
+#define NM_FLAGS_ANY(flags, check)  ( ( ((flags) & (check)) != 0       ) ? TRUE : FALSE )
+#define NM_FLAGS_ALL(flags, check)  ( ( ((flags) & (check)) == (check) ) ? TRUE : FALSE )
+
+
 /**
  * str_if_set:
  * @str: input string that will be returned if @str is not %NULL