added container_of macro

1 files changed, 1 insertions, 1 deletions

diff --git a/quickjs.c b/quickjs.c
index 2e391e5..45b0be8 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -4064,7 +4064,7 @@ void JS_FreeCString(JSContext *ctx, const char *ptr)
     if (!ptr)
         return;
     /* purposely removing constness */
-    p = (JSString *)(void *)(ptr - offsetof(JSString, u));
+    p = container_of(ptr, JSString, u);
     JS_FreeValue(ctx, JS_MKPTR(JS_TAG_STRING, p));
 }