From ae9c385e13cff233527b55090dc8ae55de6664ae Mon Sep 17 00:00:00 2001
From: Piotr Caban <piotr@codeweavers.com>
Date: Wed, 15 Jul 2020 14:05:36 +0200
Subject: [PATCH] msvcrt: Don't use strstrW in wcsstr.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/msvcrt/wcs.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 59ff24e1967..ff066fb5c56 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -2652,7 +2652,19 @@ int CDECL MSVCRT_wcslen(const MSVCRT_wchar_t *str)
  */
 MSVCRT_wchar_t* CDECL MSVCRT_wcsstr(const MSVCRT_wchar_t *str, const MSVCRT_wchar_t *sub)
 {
-    return strstrW(str, sub);
+    while(*str)
+    {
+        const MSVCRT_wchar_t *p1 = str, *p2 = sub;
+        while(*p1 && *p2 && *p1 == *p2)
+        {
+            p1++;
+            p2++;
+        }
+        if(!*p2)
+            return (MSVCRT_wchar_t*)str;
+        str++;
+    }
+    return NULL;
 }
 
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