serial.c revision 290001 
1/*
2 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2001  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id: serial.c,v 1.12 2007/06/19 23:47:17 tbox Exp $ */
19
20/*! \file */
21
22#include <config.h>
23
24#include <isc/serial.h>
25
26isc_boolean_t
27isc_serial_lt(isc_uint32_t a, isc_uint32_t b) {
28	/*
29	 * Undefined => ISC_FALSE
30	 */
31	if (a == (b ^ 0x80000000U))
32		return (ISC_FALSE);
33	return (((isc_int32_t)(a - b) < 0) ? ISC_TRUE : ISC_FALSE);
34}
35
36isc_boolean_t
37isc_serial_gt(isc_uint32_t a, isc_uint32_t b) {
38	return (((isc_int32_t)(a - b) > 0) ? ISC_TRUE : ISC_FALSE);
39}
40
41isc_boolean_t
42isc_serial_le(isc_uint32_t a, isc_uint32_t b) {
43	return ((a == b) ? ISC_TRUE : isc_serial_lt(a, b));
44}
45
46isc_boolean_t
47isc_serial_ge(isc_uint32_t a, isc_uint32_t b) {
48	return ((a == b) ? ISC_TRUE : isc_serial_gt(a, b));
49}
50
51isc_boolean_t
52isc_serial_eq(isc_uint32_t a, isc_uint32_t b) {
53	return ((a == b) ? ISC_TRUE : ISC_FALSE);
54}
55
56isc_boolean_t
57isc_serial_ne(isc_uint32_t a, isc_uint32_t b) {
58	return ((a != b) ? ISC_TRUE : ISC_FALSE);
59}
60