win32os.c revision 290001 
1/*
2 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2002  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: win32os.c,v 1.5 2007/06/19 23:47:19 tbox Exp $ */
19
20#include <windows.h>
21
22#include <isc/win32os.h>
23
24static BOOL bInit = FALSE;
25static OSVERSIONINFOEX osVer;
26
27static void
28initialize_action(void) {
29	BOOL bSuccess;
30
31	if (bInit)
32		return;
33	/*
34	 * NOTE: VC++ 6.0 gets this function declaration wrong
35	 * so we compensate by casting the argument
36	 */
37	osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
38	bSuccess = GetVersionEx((OSVERSIONINFO *) &osVer);
39
40	/*
41	 * Versions of NT before NT4.0 SP6 did not return the
42	 * extra info that the EX structure provides and returns
43	 * a failure so we need to retry with the old structure.
44	 */
45	if(!bSuccess) {
46		osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
47		bSuccess = GetVersionEx((OSVERSIONINFO *) &osVer);
48	}
49	bInit = TRUE;
50}
51
52unsigned int
53isc_win32os_majorversion(void) {
54	initialize_action();
55	return ((unsigned int)osVer.dwMajorVersion);
56}
57
58unsigned int
59isc_win32os_minorversion(void) {
60	initialize_action();
61	return ((unsigned int)osVer.dwMinorVersion);
62}
63
64unsigned int
65isc_win32os_servicepackmajor(void) {
66	initialize_action();
67	return ((unsigned int)osVer.wServicePackMajor);
68}
69
70unsigned int
71isc_win32os_servicepackminor(void) {
72	initialize_action();
73	return ((unsigned int)osVer.wServicePackMinor);
74}
75
76int
77isc_win32os_versioncheck(unsigned int major, unsigned int minor,
78		     unsigned int spmajor, unsigned int spminor) {
79
80	initialize_action();
81
82	if (major < isc_win32os_majorversion())
83		return (1);
84	if (major > isc_win32os_majorversion())
85		return (-1);
86	if (minor < isc_win32os_minorversion())
87		return (1);
88	if (minor > isc_win32os_minorversion())
89		return (-1);
90	if (spmajor < isc_win32os_servicepackmajor())
91		return (1);
92	if (spmajor > isc_win32os_servicepackmajor())
93		return (-1);
94	if (spminor < isc_win32os_servicepackminor())
95		return (1);
96	if (spminor > isc_win32os_servicepackminor())
97		return (-1);
98
99	/* Exact */
100	return (0);
101}