From: Frantisek Sumsal <frantisek@sumsal.cz>
Date: Wed, 25 Jan 2023 10:35:06 +0000 (+0100)
Subject: coccinelle: skip the empty-to-null transformation on the macro itself
X-Git-Tag: v253-rc2~67^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F26192%2Fhead;p=thirdparty%2Fsystemd.git

coccinelle: skip the empty-to-null transformation on the macro itself

Since the empty_to_null() function was "macrofied", we need to use a bit
of black magic to make Coccinelle avoid running the transformation on
the macro itself.

Follow-up to ef2409cbde3.
---

diff --git a/coccinelle/empty-to-null.cocci b/coccinelle/empty-to-null.cocci
index 1cc89475a6f..82819e9e3c9 100644
--- a/coccinelle/empty-to-null.cocci
+++ b/coccinelle/empty-to-null.cocci
@@ -1,7 +1,11 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 @@
-/* Avoid running this transformation on the empty_to_null function itself */
-position p : script:python() { p[0].current_element != "empty_to_null" };
+/* Avoid running this transformation on the empty_to_null macro itself.
+ * See the note in strempty.cocci to understand the weird magic below.
+*/
+position p : script:python() {
+        not (p[0].file == "src/basic/string-util.h" and p[0].current_element == "something_else")
+};
 expression s;
 @@