1 files changed, 55 insertions, 0 deletions
diff --git a/lib/isc/serial.c b/lib/isc/serial.c
new file mode 100644
index 0000000..5ede64b
--- /dev/null
+++ b/lib/isc/serial.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/serial.h>
+
+bool
+isc_serial_lt(uint32_t a, uint32_t b) {
+	/*
+	 * Undefined => false
+	 */
+	if (a == (b ^ 0x80000000U)) {
+		return (false);
+	}
+	return (((int32_t)(a - b) < 0) ? true : false);
+}
+
+bool
+isc_serial_gt(uint32_t a, uint32_t b) {
+	return (((int32_t)(a - b) > 0) ? true : false);
+}
+
+bool
+isc_serial_le(uint32_t a, uint32_t b) {
+	return ((a == b) ? true : isc_serial_lt(a, b));
+}
+
+bool
+isc_serial_ge(uint32_t a, uint32_t b) {
+	return ((a == b) ? true : isc_serial_gt(a, b));
+}
+
+bool
+isc_serial_eq(uint32_t a, uint32_t b) {
+	return ((a == b) ? true : false);
+}
+
+bool
+isc_serial_ne(uint32_t a, uint32_t b) {
+	return ((a != b) ? true : false);
+}