From 2f5a3fa16fa79889534686606935b8a723f77c8b Mon Sep 17 00:00:00 2001
From: Owen Rudge <orudge@codeweavers.com>
Date: Thu, 16 Apr 2020 15:06:47 +0100
Subject: [PATCH] winecfg: Add /? parameter to print help and valid versions.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=41559
Signed-off-by: Owen Rudge <orudge@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 programs/winecfg/appdefaults.c | 10 ++++++++++
 programs/winecfg/main.c        | 14 ++++++++++++++
 programs/winecfg/winecfg.h     |  1 +
 3 files changed, 25 insertions(+)

diff --git a/programs/winecfg/appdefaults.c b/programs/winecfg/appdefaults.c
index 050b0e029d3..1ac2985a110 100644
--- a/programs/winecfg/appdefaults.c
+++ b/programs/winecfg/appdefaults.c
@@ -484,6 +484,16 @@ BOOL set_winver_from_string(const char *version)
     return FALSE;
 }
 
+void print_windows_versions(void)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(win_versions); i++)
+    {
+        printf("  %10s  %s\n", win_versions[i].szVersion, win_versions[i].szDescription);
+    }
+}
+
 static void on_winver_change(HWND dialog)
 {
     int selection = SendDlgItemMessageW(dialog, IDC_WINVER, CB_GETCURSEL, 0, 0);
diff --git a/programs/winecfg/main.c b/programs/winecfg/main.c
index c5d4807e939..c6947bc0425 100644
--- a/programs/winecfg/main.c
+++ b/programs/winecfg/main.c
@@ -202,6 +202,20 @@ ProcessCmdLine(LPSTR lpCmdLine)
         return set_winver_from_string(&lpCmdLine[3]);
     }
 
+    if (lpCmdLine[1] == '?')
+    {
+        printf("Usage: winecfg [options]\n\n");
+        printf("Options:\n");
+        printf("  [no option] Launch the graphical version of this program.\n");
+        printf("  /D          Autodetect drives.\n");
+        printf("  /v version  Set global Windows version to 'version'.\n");
+        printf("  /?          Display this information and exit.\n\n");
+        printf("Valid versions for 'version':\n\n");
+        print_windows_versions();
+
+        return 0;
+    }
+
     return -1;
 }
 
diff --git a/programs/winecfg/winecfg.h b/programs/winecfg/winecfg.h
index a8d5d5b0ee0..b1325c163c3 100644
--- a/programs/winecfg/winecfg.h
+++ b/programs/winecfg/winecfg.h
@@ -91,6 +91,7 @@ INT_PTR CALLBACK AboutDlgProc (HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lPara
 
 /* Windows version management */
 BOOL set_winver_from_string(const char *version);
+void print_windows_versions(void);
 
 /* Drive management  */
 BOOL load_drives(void);