* @member: name of the field within the object.
*/
#define caa_container_of(ptr, type, member) \
+ __extension__ \
({ \
const __typeof__(((type *) NULL)->member) * __ptr = (ptr); \
(type *)((char *)__ptr - offsetof(type, member)); \
#define caa_is_signed_type(type) ((type) -1 < (type) 0)
/*
- * Sign-extend to long if needed, and output type is unsigned long.
+ * Cast to unsigned long, sign-extending if @v is signed.
+ * Note: casting to a larger type or to same type size keeps the sign of
+ * the expression being cast (see C99 6.3.1.3).
*/
-#define caa_cast_long_keep_sign(v) \
- (caa_is_signed_type(__typeof__(v)) ? \
- (unsigned long) (long) (v) : \
- (unsigned long) (v))
+#define caa_cast_long_keep_sign(v) ((unsigned long) (v))
#if defined (__GNUC__) \
&& ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5) \