core: add utility function nm_utils_is_uuid()

src/NetworkManagerUtils.c

@@ -988,3 +988,20 @@ nm_utils_complete_generic (NMConnection *connection,
 	}
 }
 
+gboolean
+nm_utils_is_uuid (const char *str)
+{
+	const char *p = str;
+	int num_dashes = 0;
+
+	while (*p) {
+		if (*p == '-')
+			num_dashes++;
+		else if (!isxdigit (*p))
+			return FALSE;
+		p++;
+	}
+
+	return (num_dashes == 4) && (p - str == 36);
+}
+

src/NetworkManagerUtils.h

@@ -92,4 +92,6 @@ void nm_utils_complete_generic (NMConnection *connection,
                                 const char *preferred,
                                 gboolean default_enable_ipv6);
 
+gboolean nm_utils_is_uuid (const char *str);
+
 #endif /* NETWORK_MANAGER_UTILS_H */