From c339105b0dca35e01424a2bb6b78a114e3cd742b Mon Sep 17 00:00:00 2001
From: Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
Date: Sun, 30 Jan 2022 11:23:22 +0900
Subject: [PATCH] [NTUSER] Implement GetSystemMetrics.SM_DBCSENABLED (#4317)

- Add UserIsDBCSEnabled helper function.
- Support SM_DBCSENABLED value of GetSystemMetrics function.
CORE-11700
---
 win32ss/user/ntuser/metric.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/win32ss/user/ntuser/metric.c b/win32ss/user/ntuser/metric.c
index cae66b0807d..9b8d71da2a6 100644
--- a/win32ss/user/ntuser/metric.c
+++ b/win32ss/user/ntuser/metric.c
@@ -14,6 +14,21 @@ static BOOL Setup = FALSE;
 
 /* FUNCTIONS *****************************************************************/
 
+BOOL APIENTRY UserIsDBCSEnabled(VOID)
+{
+    switch (PRIMARYLANGID(gusLanguageID))
+    {
+        case LANG_CHINESE:
+        case LANG_JAPANESE:
+        case LANG_KOREAN:
+        //case LANG_VIETNAMESE: // Are you using double-byte character strings?
+            return TRUE;
+
+        default:
+            return FALSE;
+    }
+}
+
 BOOL
 NTAPI
 InitMetrics(VOID)
@@ -150,7 +165,7 @@ InitMetrics(VOID)
     piSysMet[SM_NETWORK] = 3;
     piSysMet[SM_SLOWMACHINE] = 0;
     piSysMet[SM_SECURE] = 0;
-    piSysMet[SM_DBCSENABLED] = 0;
+    piSysMet[SM_DBCSENABLED] = UserIsDBCSEnabled();
     piSysMet[SM_SHOWSOUNDS] = gspv.bShowSounds;
     piSysMet[SM_MIDEASTENABLED] = 0;
     piSysMet[SM_CMONITORS] = 1;
@@ -183,6 +198,9 @@ UserGetSystemMetrics(ULONG Index)
     ASSERT(Setup);
     TRACE("UserGetSystemMetrics(%lu)\n", Index);
 
+    if (Index == SM_DBCSENABLED)
+        return UserIsDBCSEnabled();
+
     /* Get metrics from array */
     if (Index < SM_CMETRICS)
     {
@@ -206,5 +224,4 @@ UserGetSystemMetrics(ULONG Index)
     return 0;
 }
 
-
 /* EOF */