libnm: add nm_utils_uuid_is_null() helper

3 files changed, 36 insertions, 0 deletions

diff --git a/libnm-core/nm-core-internal.h b/libnm-core/nm-core-internal.h
index 80d00d90a..bd004d195 100644
--- a/libnm-core/nm-core-internal.h
+++ b/libnm-core/nm-core-internal.h
@@ -295,6 +295,8 @@ char *_nm_utils_uuid_unparse (const NMUuid *uuid,
                               char *out_str /*[37]*/);
 NMUuid *_nm_utils_uuid_generate_random (NMUuid *out_uuid);
 
+gboolean nm_utils_uuid_is_null (const NMUuid *uuid);
+
 #define NM_UTILS_UUID_TYPE_LEGACY            0
 #define NM_UTILS_UUID_TYPE_VERSION3          3
 #define NM_UTILS_UUID_TYPE_VERSION5          5
diff --git a/libnm-core/nm-utils.c b/libnm-core/nm-utils.c
index abdf80474..6504158a5 100644
--- a/libnm-core/nm-utils.c
+++ b/libnm-core/nm-utils.c
@@ -2821,6 +2821,21 @@ _nm_utils_uuid_generate_random (NMUuid *out_uuid)
 	return out_uuid;
 }
 
+gboolean
+nm_utils_uuid_is_null (const NMUuid *uuid)
+{
+	int i;
+
+	if (!uuid)
+		return TRUE;
+
+	for (i = 0; i < G_N_ELEMENTS (uuid->uuid); i++) {
+		if (uuid->uuid[i])
+			return FALSE;
+	}
+	return TRUE;
+}
+
 /**
  * nm_utils_uuid_generate_buf_:
  * @buf: input buffer, must contain at least 37 bytes
diff --git a/libnm-core/tests/test-general.c b/libnm-core/tests/test-general.c
index 0f0b1c527..67b80098a 100644
--- a/libnm-core/tests/test-general.c
+++ b/libnm-core/tests/test-general.c
@@ -5445,6 +5445,16 @@ test_nm_strquote (void)
 #define UUID_NS_OID     "6ba7b812-9dad-11d1-80b4-00c04fd430c8"
 #define UUID_NS_X500    "6ba7b814-9dad-11d1-80b4-00c04fd430c8"
 
+static const NMUuid *
+_uuid (const char *str)
+{
+	static NMUuid u;
+
+	g_assert (str);
+	g_assert (_nm_utils_uuid_parse (str, &u));
+	return &u;
+}
+
 static void
 _test_uuid (int uuid_type, const char *expected_uuid, const char *str, gssize slen, gpointer type_args)
 {
@@ -5677,6 +5687,15 @@ __test_uuid (const char *expected_uuid, const char *str, gssize slen, char *uuid
 static void
 test_nm_utils_uuid_generate_from_strings (void)
 {
+	const NMUuid uuid0 = { 0 };
+
+	g_assert_cmpmem (&uuid0, sizeof (uuid0), _uuid ("00000000-0000-0000-0000-000000000000"), 16);
+
+	g_assert (nm_utils_uuid_is_null (NULL));
+	g_assert (nm_utils_uuid_is_null (&uuid0));
+	g_assert ( nm_utils_uuid_is_null (_uuid ("00000000-0000-0000-0000-000000000000")));
+	g_assert (!nm_utils_uuid_is_null (_uuid ("10000000-0000-0000-0000-000000000000")));
+
 	_test_uuid ("b07c334a-399b-32de-8d50-58e4e08f98e3", "",         0, NULL);
 	_test_uuid ("b8a426cb-bcb5-30a3-bd8f-6786fea72df9", "\0",       1, "");
 	_test_uuid ("12a4a982-7aae-39e1-951e-41aeb1250959", "a\0",      2, "a");