shell32: Use the current directory when copying to an empty destination.

dlls/shell32/shlfileop.c

@@ -1182,6 +1182,20 @@ static HRESULT copy_files(FILE_OPERATION *op, const FILE_LIST *flFrom, FILE_LIST
     if (flFrom->bAnyDontExist)
         return ERROR_SHELL_INTERNAL_FILE_NOT_FOUND;
 
+    if (flTo->dwNumFiles == 0)
+    {
+        /* If the destination is empty, SHFileOperation should use the current directory */
+        WCHAR curdir[MAX_PATH+1];
+
+        GetCurrentDirectoryW(MAX_PATH, curdir);
+        curdir[lstrlenW(curdir)+1] = 0;
+
+        destroy_file_list(flTo);
+        ZeroMemory(flTo, sizeof(FILE_LIST));
+        parse_file_list(flTo, curdir);
+        fileDest = &flTo->feFiles[0];
+    }
+
     if (op->req->fFlags & FOF_MULTIDESTFILES)
     {
         if (flFrom->bAnyFromWildcard)

dlls/shell32/tests/shlfileop.c

@@ -1720,6 +1720,18 @@ static void test_copy(void)
     ok(DeleteFileA("ab.txt"), "Expected file to exist\n");
     ok(RemoveDirectoryA("one"), "Expected dir to exist\n");
     ok(RemoveDirectoryA("two"), "Expected dir to exist\n");
+
+    /* pTo is an empty string  */
+    CreateDirectoryA("dir", NULL);
+    createTestFile("dir\\abcdefgh.abc");
+    shfo.pFrom = "dir\\abcdefgh.abc\0";
+    shfo.pTo = "\0";
+    shfo.fFlags = FOF_NOCONFIRMATION | FOF_SILENT | FOF_NOERRORUI;
+    retval = SHFileOperation(&shfo);
+    ok(retval == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", retval);
+    ok(DeleteFileA("dir\\abcdefgh.abc"), "Expected file to exist\n");
+    ok(DeleteFileA("abcdefgh.abc"), "Expected file to exist\n");
+    ok(RemoveDirectoryA("dir"), "Expected dir to exist\n");
 }
 
 /* tests the FO_MOVE action */