[WINVER] Display compatibility information

Also don't hardcode the OS name.

base/applications/winver/CMakeLists.txt

@@ -1,5 +1,11 @@
 
-add_executable(winver winver.c winver.rc)
+list(APPEND SOURCE
+    osinfo.c
+    winver.c
+    winver_p.h)
+
+add_executable(winver ${SOURCE} winver.rc)
 set_module_type(winver win32gui UNICODE)
-add_importlibs(winver shell32 comctl32 msvcrt kernel32)
+add_importlibs(winver advapi32 user32 shell32 comctl32 msvcrt kernel32)
+add_pch(winver winver_p.h SOURCE)
 add_cd_file(TARGET winver DESTINATION reactos/system32 FOR all)

base/applications/winver/lang/en-US.rc

@@ -0,0 +1,7 @@
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+STRINGTABLE
+BEGIN
+    IDS_OSINFO_COMPAT_FORMAT "Reporting NT %s (Build %s%s)"
+    IDS_OSINFO_SPK_FORMAT ": %s"
+END

base/applications/winver/osinfo.c

@@ -0,0 +1,123 @@
+/*
+ * PROJECT:    ReactOS Version Program
+ * LICENSE:    LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
+ * PURPOSE:    Retrieve OS name and simple compatibility information
+ * COPYRIGHT:  Copyright 2025 Thamatip Chitpong <[email protected]>
+ */
+
+#include "winver_p.h"
+
+#define OSINFO_KEY L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion"
+
+static
+VOID
+Winver_GetRegValueString(
+    _In_ HKEY hKey,
+    _In_ LPCWSTR lpValue,
+    _Out_ LPWSTR lpBuffer,
+    _In_ DWORD cchSize)
+{
+    DWORD dwType, dwSize;
+    LSTATUS lError;
+
+    /* NOTE: Reserved space for a NULL terminator */
+    dwSize = (cchSize - 1) * sizeof(WCHAR);
+    lError = RegQueryValueExW(hKey, lpValue, NULL, &dwType, (LPBYTE)lpBuffer, &dwSize);
+    if (lError != ERROR_SUCCESS || dwType != REG_SZ)
+    {
+        /* Return empty string on failure */
+        lpBuffer[0] = UNICODE_NULL;
+        return;
+    }
+
+    /* Ensure the returned string is NULL terminated */
+    lpBuffer[cchSize - 1] = UNICODE_NULL;
+}
+
+static
+VOID
+Winver_GetFormattedSpkInfo(
+    _In_ HKEY hKey,
+    _Out_ LPWSTR lpBuffer,
+    _In_ DWORD cchSize)
+{
+    WCHAR szRegValue[48];
+    WCHAR szFormat[16] = L"";
+
+    Winver_GetRegValueString(hKey, L"CSDVersion", szRegValue, _countof(szRegValue));
+    if (!*szRegValue)
+    {
+        /* Return empty string on failure */
+        lpBuffer[0] = UNICODE_NULL;
+        return;
+    }
+
+    LoadStringW(GetModuleHandleW(NULL),
+                IDS_OSINFO_SPK_FORMAT,
+                szFormat,
+                _countof(szFormat));
+
+    StringCchPrintfW(lpBuffer, cchSize, szFormat, szRegValue);
+}
+
+static
+VOID
+Winver_FormatCompatInfo(
+    _Inout_ PWINVER_OS_INFO OSInfo)
+{
+    WCHAR szFormat[64] = L"";
+
+    /* Required info must be valid */
+    if (!*(OSInfo->szNtVersion) || !*(OSInfo->szNtBuild))
+    {
+        /* Return empty string on failure */
+        OSInfo->szCompatInfo[0] = UNICODE_NULL;
+        return;
+    }
+
+    LoadStringW(GetModuleHandleW(NULL),
+                IDS_OSINFO_COMPAT_FORMAT,
+                szFormat,
+                _countof(szFormat));
+
+    /* NOTE: Service pack info is optional */
+    StringCchPrintfW(OSInfo->szCompatInfo, _countof(OSInfo->szCompatInfo), szFormat,
+                     OSInfo->szNtVersion,
+                     OSInfo->szNtBuild,
+                     OSInfo->szNtSpk);
+}
+
+BOOL
+Winver_GetOSInfo(
+    _Out_ PWINVER_OS_INFO OSInfo)
+{
+    HKEY hKey;
+    LSTATUS lError;
+
+    lError = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
+                           OSINFO_KEY,
+                           0,
+                           KEY_QUERY_VALUE,
+                           &hKey);
+    if (lError != ERROR_SUCCESS)
+        return FALSE;
+
+    /* OS name */
+    Winver_GetRegValueString(hKey, L"ProductName", OSInfo->szName, _countof(OSInfo->szName));
+    if (!*(OSInfo->szName))
+    {
+        /* This info must be valid */
+        RegCloseKey(hKey);
+        return FALSE;
+    }
+
+    /* Compatibility information */
+    Winver_GetRegValueString(hKey, L"CurrentVersion", OSInfo->szNtVersion, _countof(OSInfo->szNtVersion));
+    Winver_GetRegValueString(hKey, L"CurrentBuildNumber", OSInfo->szNtBuild, _countof(OSInfo->szNtBuild));
+    Winver_GetFormattedSpkInfo(hKey, OSInfo->szNtSpk, _countof(OSInfo->szNtSpk));
+    Winver_FormatCompatInfo(OSInfo);
+
+    RegCloseKey(hKey);
+
+    return TRUE;
+}

base/applications/winver/resource.h

@@ -0,0 +1,4 @@
+#pragma once
+
+#define IDS_OSINFO_COMPAT_FORMAT 1
+#define IDS_OSINFO_SPK_FORMAT    2

base/applications/winver/winver.c

@@ -4,16 +4,12 @@
  * FILE:            base/applications/winver/winver.c
  */
 
-#include <stdarg.h>
-#include <windef.h>
-#include <winbase.h>
-#include <winuser.h>
-#include <commctrl.h>
-#include <shellapi.h>
+#include "winver_p.h"
 
 int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
 {
     INITCOMMONCONTROLSEX iccx;
+    WINVER_OS_INFO OSInfo;
 
     UNREFERENCED_PARAMETER(hInstance);
     UNREFERENCED_PARAMETER(hPrevInstance);
@@ -25,5 +21,12 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLi
     iccx.dwICC = ICC_STANDARD_CLASSES | ICC_WIN95_CLASSES;
     InitCommonControlsEx(&iccx);
 
-    return ShellAboutW(NULL, L"ReactOS", NULL, NULL);
+    if (!Winver_GetOSInfo(&OSInfo))
+    {
+        /* OS info is not available, display the default contents */
+        StringCchCopyW(OSInfo.szName, _countof(OSInfo.szName), L"ReactOS");
+        OSInfo.szCompatInfo[0] = UNICODE_NULL;
+    }
+
+    return ShellAboutW(NULL, OSInfo.szName, OSInfo.szCompatInfo, NULL);
 }

base/applications/winver/winver.rc

@@ -2,9 +2,18 @@
 #include <windef.h>
 #include <winuser.h>
 
+#include "resource.h"
+
 #define REACTOS_STR_FILE_DESCRIPTION  "ReactOS Version Program"
 #define REACTOS_STR_INTERNAL_NAME     "winver"
 #define REACTOS_STR_ORIGINAL_FILENAME "winver.exe"
 #include <reactos/version.rc>
 
 #include <reactos/manifest_exe.rc>
+
+/* UTF-8 */
+#pragma code_page(65001)
+
+#ifdef LANGUAGE_EN_US
+    #include "lang/en-US.rc"
+#endif

base/applications/winver/winver_p.h

@@ -0,0 +1,35 @@
+/*
+ * PROJECT:    ReactOS Version Program
+ * LICENSE:    LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
+ * PURPOSE:    Main header
+ * COPYRIGHT:  Copyright 2025 Thamatip Chitpong <[email protected]>
+ */
+
+#pragma once
+
+#include <stdarg.h>
+#include <stdlib.h>
+
+#include <windef.h>
+#include <winbase.h>
+#include <winreg.h>
+#include <winuser.h>
+#include <commctrl.h>
+#include <shellapi.h>
+
+#include <strsafe.h>
+
+#include "resource.h"
+
+typedef struct _WINVER_OS_INFO
+{
+    WCHAR szName[64];
+    WCHAR szNtVersion[16];
+    WCHAR szNtBuild[16];
+    WCHAR szNtSpk[64];
+    WCHAR szCompatInfo[256];
+} WINVER_OS_INFO, *PWINVER_OS_INFO;
+
+BOOL
+Winver_GetOSInfo(
+    _Out_ PWINVER_OS_INFO OSInfo);