1/*	$NetBSD: win32os.c,v 1.6 2020/05/25 20:47:23 christos Exp $	*/
2
3/*
4 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 2002  Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20/* Id: win32os.c,v 1.5 2007/06/19 23:47:19 tbox Exp  */
21
22#include <windows.h>
23
24#include <isc/win32os.h>
25
26static BOOL bInit = FALSE;
27static OSVERSIONINFOEX osVer;
28
29static void
30initialize_action(void) {
31	BOOL bSuccess;
32
33	if (bInit)
34		return;
35	/*
36	 * NOTE: VC++ 6.0 gets this function declaration wrong
37	 * so we compensate by casting the argument
38	 */
39	osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
40	bSuccess = GetVersionEx((OSVERSIONINFO *) &osVer);
41
42	/*
43	 * Versions of NT before NT4.0 SP6 did not return the
44	 * extra info that the EX structure provides and returns
45	 * a failure so we need to retry with the old structure.
46	 */
47	if(!bSuccess) {
48		osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
49		bSuccess = GetVersionEx((OSVERSIONINFO *) &osVer);
50	}
51	bInit = TRUE;
52}
53
54unsigned int
55isc_win32os_majorversion(void) {
56	initialize_action();
57	return ((unsigned int)osVer.dwMajorVersion);
58}
59
60unsigned int
61isc_win32os_minorversion(void) {
62	initialize_action();
63	return ((unsigned int)osVer.dwMinorVersion);
64}
65
66unsigned int
67isc_win32os_servicepackmajor(void) {
68	initialize_action();
69	return ((unsigned int)osVer.wServicePackMajor);
70}
71
72unsigned int
73isc_win32os_servicepackminor(void) {
74	initialize_action();
75	return ((unsigned int)osVer.wServicePackMinor);
76}
77
78int
79isc_win32os_versioncheck(unsigned int major, unsigned int minor,
80		     unsigned int spmajor, unsigned int spminor) {
81
82	initialize_action();
83
84	if (major < isc_win32os_majorversion())
85		return (1);
86	if (major > isc_win32os_majorversion())
87		return (-1);
88	if (minor < isc_win32os_minorversion())
89		return (1);
90	if (minor > isc_win32os_minorversion())
91		return (-1);
92	if (spmajor < isc_win32os_servicepackmajor())
93		return (1);
94	if (spmajor > isc_win32os_servicepackmajor())
95		return (-1);
96	if (spminor < isc_win32os_servicepackminor())
97		return (1);
98	if (spminor > isc_win32os_servicepackminor())
99		return (-1);
100
101	/* Exact */
102	return (0);
103}
104