1 files changed, 73 insertions, 0 deletions
diff --git a/coccinelle/strempty.cocci b/coccinelle/strempty.cocci
new file mode 100644
index 0000000..d36f092
--- /dev/null
+++ b/coccinelle/strempty.cocci
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+@@
+/* Avoid running this transformation on the strempty function itself and
+ * on the "make_expression" macro in src/libsystemd/sd-bus/bus-convenience.c.
+ * As Coccinelle's Location object doesn't support macro "detection", use
+ * a pretty horrifying combo of specifying a file and a special "something_else"
+ * position element, which is, apparently, the default value of
+ * "current_element" before it's set (according to the source code), thus
+ * matching any "top level" position, including macros. Let's hope we never
+ * introduce a function called "something_else"...
+ */
+position p : script:python() {
+        not (p[0].current_element == "strempty" or
+                (p[0].file == "src/libsystemd/sd-bus/bus-convenience.c" and
+                        p[0].current_element == "something_else"))
+};
+expression s;
+@@
+(
+- s@p ?: ""
++ strempty(s)
+|
+- s@p ? s : ""
++ strempty(s)
+)
+
+@@
+position p : script:python() { p[0].current_element != "strempty" };
+expression s;
+@@
+- if (!s@p)
+-         s = "";
++ s = strempty(s);
+
+@@
+position p : script:python() { p[0].current_element != "strnull" };
+expression s;
+@@
+(
+- s@p ?: "(null)"
++ strnull(s)
+|
+- s@p ? s : "(null)"
++ strnull(s)
+)
+
+@@
+position p : script:python() { p[0].current_element != "strnull" };
+expression s;
+@@
+- if (!s@p)
+-         s = "(null)";
++ s = strnull(s);
+
+@@
+position p : script:python() { p[0].current_element != "strna" };
+expression s;
+@@
+(
+- s@p ?: "n/a"
++ strna(s)
+|
+- s@p ? s : "n/a"
++ strna(s)
+)
+
+@@
+position p : script:python() { p[0].current_element != "strna" };
+expression s;
+@@
+- if (!s@p)
+-         s = "n/a";
++ s = strna(s);