From c4ef94b1a270ab01d0ca50ecbc1df7fcdf6fc44f Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Mon, 30 Aug 1999 14:45:01 +0000
Subject: [PATCH] 	Add 32 bit serial arithmetic support.

---
 lib/isc/include/isc/Makefile.in |  4 +--
 lib/isc/include/isc/serial.h    | 55 +++++++++++++++++++++++++++++++++
 lib/isc/serial.c                | 39 +++++++++++++++++++++++
 3 files changed, 96 insertions(+), 2 deletions(-)
 create mode 100644 lib/isc/include/isc/serial.h
 create mode 100644 lib/isc/serial.c

diff --git a/lib/isc/include/isc/Makefile.in b/lib/isc/include/isc/Makefile.in
index 47d79bd05c..13e1c0389d 100644
--- a/lib/isc/include/isc/Makefile.in
+++ b/lib/isc/include/isc/Makefile.in
@@ -22,8 +22,8 @@ top_srcdir =	@top_srcdir@
 HEADERS =	assertions.h base64.h boolean.h buffer.h error.h event.h \
 		eventclass.h heap.h int.h interfaceiter.h lang.h lex.h lib.h \
 		list.h mem.h msgcat.h netaddr.h rbtgen.h region.h result.h \
-		resultclass.h rwlock.h sockaddr.h socket.h str.h symtab.h \
-		task.h timer.h types.h
+		resultclass.h rwlock.h serial.h sockaddr.h socket.h str.h \
+		symtab.h task.h timer.h types.h
 
 SUBDIRS =
 TARGETS =
diff --git a/lib/isc/include/isc/serial.h b/lib/isc/include/isc/serial.h
new file mode 100644
index 0000000000..abd4ddd3bc
--- /dev/null
+++ b/lib/isc/include/isc/serial.h
@@ -0,0 +1,55 @@
+
+	/* $Id: serial.h,v 1.1 1999/08/30 14:44:11 marka Exp $ */
+
+#ifndef isc_serial_h
+#define isc_serial_h
+
+#include <isc/types.h>
+#include <isc/boolean.h>
+#include <isc/lang.h>
+
+ISC_LANG_BEGINDECLS
+
+/*
+ *	Implement 32 bit serial space arithmetic comparision functions.
+ *
+ *	Note: Undefined results are returned as ISC_FALSE.
+ */
+
+/***
+ ***	Functions
+ ***/
+
+isc_boolean_t isc_serial_lt(isc_uint32_t a, isc_uint32_t b);
+/*
+ *	Return true if 'a' < 'b' otherwise false.
+ */
+
+isc_boolean_t isc_serial_gt(isc_uint32_t a, isc_uint32_t b);
+/*
+ *	Return true if 'a' > 'b' otherwise false.
+ */
+
+isc_boolean_t isc_serial_le(isc_uint32_t a, isc_uint32_t b);
+/*
+ *	Return true if 'a' <= 'b' otherwise false.
+ */
+
+isc_boolean_t isc_serial_ge(isc_uint32_t a, isc_uint32_t b);
+/*
+ *	Return true if 'a' >= 'b' otherwise false.
+ */
+
+isc_boolean_t isc_serial_eq(isc_uint32_t a, isc_uint32_t b);
+/*
+ *	Return true if 'a' == 'b' otherwise false.
+ */
+
+isc_boolean_t isc_serial_ne(isc_uint32_t a, isc_uint32_t b);
+/*
+ *	Return true if 'a' != 'b' otherwise false.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* isc_serial_h */
diff --git a/lib/isc/serial.c b/lib/isc/serial.c
new file mode 100644
index 0000000000..0f10008df5
--- /dev/null
+++ b/lib/isc/serial.c
@@ -0,0 +1,39 @@
+
+	/* $Id: serial.c,v 1.1 1999/08/30 14:45:01 marka Exp $ */
+
+#include <isc/serial.h>
+
+isc_boolean_t
+isc_serial_lt(isc_uint32_t a, isc_uint32_t b) {
+	/*
+	 * Undefined => ISC_FALSE
+	 */
+	if (a == (b ^ 0x80000000U))
+		return (ISC_FALSE);
+	return (((isc_int32_t)(a - b) < 0) ? ISC_TRUE : ISC_FALSE);
+}
+
+isc_boolean_t
+isc_serial_gt(isc_uint32_t a, isc_uint32_t b) {
+	return (((isc_int32_t)(a - b) > 0) ? ISC_TRUE : ISC_FALSE);
+}
+
+isc_boolean_t
+isc_serial_le(isc_uint32_t a, isc_uint32_t b) {
+	return ((a == b) ? ISC_TRUE : isc_serial_lt(a, b));
+}
+
+isc_boolean_t
+isc_serial_ge(isc_uint32_t a, isc_uint32_t b) {
+	return ((a == b) ? ISC_TRUE : isc_serial_gt(a, b));
+}
+
+isc_boolean_t
+isc_serial_eq(isc_uint32_t a, isc_uint32_t b) {
+	return ((a == b) ? ISC_TRUE : ISC_FALSE);
+}
+
+isc_boolean_t
+isc_serial_ne(isc_uint32_t a, isc_uint32_t b) {
+	return ((a != b) ? ISC_TRUE : ISC_FALSE);
+}