msi: Avoid using awstring in MsiFormatRecordW().

dlls/msi/format.c

@@ -916,22 +916,16 @@ UINT WINAPI MsiFormatRecordW( MSIHANDLE hInstall, MSIHANDLE hRecord,
     {
         LPWSTR value = NULL;
         MSIHANDLE remote;
-        awstring wstr;
 
         if ((remote = msi_get_remote(hInstall)))
         {
             r = remote_FormatRecord(remote, (struct wire_record *)&record->count, &value);
-            if (r)
-            {
-                midl_user_free(value);
-                return r;
-            }
 
-            wstr.unicode = TRUE;
-            wstr.str.w = szResult;
-            r = msi_strcpy_to_awstring(value, -1, &wstr, sz);
+            if (!r)
+                r = msi_strncpyW(value, -1, szResult, sz);
 
             midl_user_free(value);
+            msiobj_release(&record->hdr);
             return r;
         }
     }

dlls/msi/install.c

@@ -191,6 +191,25 @@ UINT msi_strncpyWtoA(const WCHAR *str, int lenW, char *buf, DWORD *sz, BOOL remo
     return r;
 }
 
+UINT msi_strncpyW(const WCHAR *str, int len, WCHAR *buf, DWORD *sz)
+{
+    UINT r = ERROR_SUCCESS;
+
+    if (!sz)
+        return buf ? ERROR_INVALID_PARAMETER : ERROR_SUCCESS;
+
+    if (len < 0) len = strlenW(str);
+    if (buf)
+        memcpy(buf, str, min(len + 1, *sz) * sizeof(WCHAR));
+    if (buf && len >= *sz)
+    {
+        if (*sz) buf[*sz - 1] = 0;
+        r = ERROR_MORE_DATA;
+    }
+    *sz = len;
+    return r;
+}
+
 const WCHAR *msi_get_target_folder( MSIPACKAGE *package, const WCHAR *name )
 {
     MSIFOLDER *folder = msi_get_loaded_folder( package, name );

dlls/msi/msipriv.h

@@ -1046,6 +1046,7 @@ extern WCHAR **msi_split_string(const WCHAR *, WCHAR) DECLSPEC_HIDDEN;
 extern UINT msi_set_original_database_property(MSIDATABASE *, const WCHAR *) DECLSPEC_HIDDEN;
 extern WCHAR *msi_get_error_message(MSIDATABASE *, int) DECLSPEC_HIDDEN;
 extern UINT msi_strncpyWtoA(const WCHAR *str, int len, char *buf, DWORD *sz, BOOL remote) DECLSPEC_HIDDEN;
+extern UINT msi_strncpyW(const WCHAR *str, int len, WCHAR *buf, DWORD *sz) DECLSPEC_HIDDEN;
 
 /* media */
 

dlls/msi/tests/custom.c

@@ -815,6 +815,17 @@ static void test_format_record(MSIHANDLE hinst)
     ok(hinst, !strcmp(buffer, "foo 123"), "got \"%s\"\n", buffer);
     ok(hinst, sz == 7, "got size %u\n", sz);
 
+    r = MsiFormatRecordW(hinst, rec, NULL, NULL);
+    ok(hinst, !r, "got %u\n", r);
+
+    r = MsiFormatRecordW(hinst, rec, bufferW, NULL);
+    ok(hinst, r == ERROR_INVALID_PARAMETER, "got %u\n", r);
+
+    sz = 0;
+    r = MsiFormatRecordW(hinst, rec, NULL, &sz);
+    ok(hinst, !r, "got %u\n", r);
+    ok(hinst, sz == 7, "got size %u\n", sz);
+
     sz = 0;
     bufferW[0] = 'q';
     r = MsiFormatRecordW(hinst, rec, bufferW, &sz);