From f691efefc26ef554e9715abfa1916527277599bb Mon Sep 17 00:00:00 2001
From: Jose Carlos Jesus <zecarlos1957@hotmail.com>
Date: Fri, 10 Feb 2023 11:05:11 -0400
Subject: [PATCH] [SHLWAPI] No need extension to execute '.bat' files
 CORE-17612 (#4932)

When no extension is provided, add default extension with correct precedence using PathFileExistsDefExtW.
- Use PathFindOnPathExW when searching in current directory and PATH environment variable.
- Fix Width String terminator to UNICODE_NULL.
- Fix all failed tests on PathFindPathExW KVM test.
CORE-17612
---
 dll/win32/kernel32/client/path.c |  4 ++--
 dll/win32/shell32/shlexec.cpp    | 28 +++++-----------------------
 dll/win32/shlwapi/path.c         |  1 +
 3 files changed, 8 insertions(+), 25 deletions(-)

diff --git a/dll/win32/kernel32/client/path.c b/dll/win32/kernel32/client/path.c
index 1fa09d530c8..ea014bb512d 100644
--- a/dll/win32/kernel32/client/path.c
+++ b/dll/win32/kernel32/client/path.c
@@ -2321,7 +2321,7 @@ GetSystemDirectoryW(OUT LPWSTR lpBuffer,
         RtlCopyMemory(lpBuffer,
                       BaseWindowsSystemDirectory.Buffer,
                       BaseWindowsSystemDirectory.Length);
-        lpBuffer[BaseWindowsSystemDirectory.Length / sizeof(WCHAR)] = ANSI_NULL;
+        lpBuffer[BaseWindowsSystemDirectory.Length / sizeof(WCHAR)] = UNICODE_NULL;
 
         ReturnLength = BaseWindowsSystemDirectory.Length;
     }
@@ -2405,7 +2405,7 @@ GetSystemWindowsDirectoryW(OUT LPWSTR lpBuffer,
         RtlCopyMemory(lpBuffer,
                       BaseWindowsDirectory.Buffer,
                       BaseWindowsDirectory.Length);
-        lpBuffer[BaseWindowsDirectory.Length / sizeof(WCHAR)] = ANSI_NULL;
+        lpBuffer[BaseWindowsDirectory.Length / sizeof(WCHAR)] = UNICODE_NULL;
 
         ReturnLength = BaseWindowsDirectory.Length;
     }
diff --git a/dll/win32/shell32/shlexec.cpp b/dll/win32/shell32/shlexec.cpp
index 746c92076bb..292c8db8292 100644
--- a/dll/win32/shell32/shlexec.cpp
+++ b/dll/win32/shell32/shlexec.cpp
@@ -2531,6 +2531,8 @@ HRESULT WINAPI ShellExecCmdLine(
     }
     else
     {
+        PCWSTR apPathList[2];
+
         pchParams = SplitParams(lpCommand, szFile, _countof(szFile));
         if (szFile[0] != UNICODE_NULL && szFile[1] == L':' &&
             szFile[2] == UNICODE_NULL)
@@ -2551,30 +2553,10 @@ HRESULT WINAPI ShellExecCmdLine(
         {
             StringCchCopyW(szFile, _countof(szFile), szFile2);
         }
-        else if (SearchPathW(NULL, szFile, NULL, _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(NULL, szFile, L".exe", _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(NULL, szFile, L".com", _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(pwszStartDir, szFile, NULL, _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(pwszStartDir, szFile, L".exe", _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(pwszStartDir, szFile, L".com", _countof(szFile2), szFile2, NULL))
-        {
-            StringCchCopyW(szFile, _countof(szFile), szFile2);
-        }
-        else if (SearchPathW(NULL, lpCommand, NULL, _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(NULL, lpCommand, L".exe", _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(NULL, lpCommand, L".com", _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(pwszStartDir, lpCommand, NULL, _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(pwszStartDir, lpCommand, L".exe", _countof(szFile2), szFile2, NULL) ||
-                 SearchPathW(pwszStartDir, lpCommand, L".com", _countof(szFile2), szFile2, NULL))
-        {
-            StringCchCopyW(szFile, _countof(szFile), szFile2);
-            pchParams = NULL;
-        }
 
-        if (pwszStartDir)
-        {
-            SetCurrentDirectoryW(szCurDir);
-        }
+        apPathList[0] = pwszStartDir;
+        apPathList[1] = NULL;
+        PathFindOnPathExW(szFile, apPathList, WHICH_DEFAULT);
 
         if (!(dwSeclFlags & SECL_ALLOW_NONEXE))
         {
diff --git a/dll/win32/shlwapi/path.c b/dll/win32/shlwapi/path.c
index fc698251cf2..2966a8bf93b 100644
--- a/dll/win32/shlwapi/path.c
+++ b/dll/win32/shlwapi/path.c
@@ -1151,6 +1151,7 @@ BOOL WINAPI PathFileExistsDefExtW(LPWSTR lpszPath,DWORD dwWhich)
 #ifdef __REACTOS__
         if (dwWhich & 0x1)
         {
+        if (GetFileAttributes(lpszPath) != FILE_ATTRIBUTE_DIRECTORY)
 #endif
         lstrcpyW(lpszPath + iLen, pszExts[iChoose]);
         if (PathFileExistsW(lpszPath))