1 files changed, 101 insertions, 0 deletions
diff --git a/lib/isc/win32/win32os.c b/lib/isc/win32/win32os.c
new file mode 100644
index 00000000..45b3c6ca
--- /dev/null
+++ b/lib/isc/win32/win32os.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2003  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * INTERNET SOFTWARE CONSORTIUM 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 1.2.176.2 2003/07/22 04:03:51 marka 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);
+		bSuccess = 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);
+}
+\ No newline at end of file