external/bsd/ntp/dist/lib/isc/win32/win32os.c

   1 /*      $NetBSD$        */
   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
  26 static BOOL bInit = FALSE;
  27 static OSVERSIONINFOEX osVer;
  28
  29 static void
  30 initialize_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
  54 unsigned int
  55 isc_win32os_majorversion(void) {
  56         initialize_action();
  57         return ((unsigned int)osVer.dwMajorVersion);
  58 }
  59
  60 unsigned int
  61 isc_win32os_minorversion(void) {
  62         initialize_action();
  63         return ((unsigned int)osVer.dwMinorVersion);
  64 }
  65
  66 unsigned int
  67 isc_win32os_servicepackmajor(void) {
  68         initialize_action();
  69         return ((unsigned int)osVer.wServicePackMajor);
  70 }
  71
  72 unsigned int
  73 isc_win32os_servicepackminor(void) {
  74         initialize_action();
  75         return ((unsigned int)osVer.wServicePackMinor);
  76 }
  77
  78 int
  79 isc_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 }