lib/sizeof.h: Make sure STRLEN() only accepts string literals

Link: <https://stackoverflow.com/a/79369560/6872717>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

diff --git a/lib/sizeof.h b/lib/sizeof.h
index ed0fc155dbe9100b0de606cb108d962fca9429ef..6051b7777d2478ad2689f9c02e587628a9a5a791 100644 (file)
--- a/lib/sizeof.h
+++ b/lib/sizeof.h
@@ -21,7 +21,7 @@
 #define WIDTHOF(x)           (sizeof(x) * CHAR_BIT)
 #define SIZEOF_ARRAY(a)      (sizeof(a) + must_be_array(a))
 #define NITEMS(a)            (SIZEOF_ARRAY((a)) / sizeof((a)[0]))
-#define STRLEN(s)            (NITEMS(s) - 1)
+#define STRLEN(s)            (NITEMS("" s "") - 1)
 
 
 #endif  // include guard