isc/win32/win32os.c

	win32os.c revision bbb3705e4cbdacf7cf6da7e448d79d97fdab2411
/*
 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2002  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: win32os.c,v 1.5 2007/06/19 23:47:19 tbox Exp $ */

#include <windows.h>

#include <isc/win32os.h>

static BOOL bInit = FALSE;
static OSVERSIONINFOEX osVer;

static void
initialize_action(void) {
    BOOL bSuccess;

    if (bInit)
        return;
    /*
     * NOTE: VC++ 6.0 gets this function declaration wrong
     * so we compensate by casting the argument
     */
    osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
    bSuccess = GetVersionEx((OSVERSIONINFO *) &osVer);

    /*
     * Versions of NT before NT4.0 SP6 did not return the
     * extra info that the EX structure provides and returns
     * a failure so we need to retry with the old structure.
     */
    if(!bSuccess) {
        osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
        (void)GetVersionEx((OSVERSIONINFO *) &osVer);
    }
    bInit = TRUE;
}

unsigned int
isc_win32os_majorversion(void) {
    initialize_action();
    return ((unsigned int)osVer.dwMajorVersion);
}

unsigned int
isc_win32os_minorversion(void) {
    initialize_action();
    return ((unsigned int)osVer.dwMinorVersion);
}

unsigned int
isc_win32os_servicepackmajor(void) {
    initialize_action();
    return ((unsigned int)osVer.wServicePackMajor);
}

unsigned int
isc_win32os_servicepackminor(void) {
    initialize_action();
    return ((unsigned int)osVer.wServicePackMinor);
}

int
isc_win32os_versioncheck(unsigned int major, unsigned int minor,
             unsigned int spmajor, unsigned int spminor) {

    initialize_action();

    if (major < isc_win32os_majorversion())
        return (1);
    if (major > isc_win32os_majorversion())
        return (-1);
    if (minor < isc_win32os_minorversion())
        return (1);
    if (minor > isc_win32os_minorversion())
        return (-1);
    if (spmajor < isc_win32os_servicepackmajor())
        return (1);
    if (spmajor > isc_win32os_servicepackmajor())
        return (-1);
    if (spminor < isc_win32os_servicepackminor())
        return (1);
    if (spminor > isc_win32os_servicepackminor())
        return (-1);

    /* Exact */
    return (0);
}