libutils: sys/queue.h: add STAILQ_FOREACH_SAFE()

Import macro STAILQ_FOREACH_SAFE from FreeBSD. Signed-off-by: Jerome Forissier <[email protected]> Reviewed-by: Joakim Bech <[email protected]> Reviewed-by: Etienne Carriere <[email protected]> Acked-by: Jens Wiklander <[email protected]>
soso7885 · Nov 8, 2018 · 5810998 · 5810998
1 parent 9a731fc
commit 5810998
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/lib/libutils/isoc/include/sys/queue.h b/lib/libutils/isoc/include/sys/queue.h
@@ -305,6 +305,11 @@ struct {								\
 		(var);							\
 		(var) = ((var)->field.stqe_next))
 
+#define	STAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = STAILQ_FIRST((head));				\
+		(var) && ((tvar) = STAILQ_NEXT((var), field), 1);	\
+		(var) = (tvar))
+
 #define	STAILQ_CONCAT(head1, head2) do {				\
 	if (!STAILQ_EMPTY((head2))) {					\
 		*(head1)->stqh_last = (head2)->stqh_first;		\