src: add nft_*_list_is_empty() functions

This functions check if a given nft_*_list is empty or not.

I found this quite useful while working with a full ruleset.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

4 files changed, 4 insertions, 0 deletions

diff --git a/include/libnftables/chain.h b/include/libnftables/chain.h
index 29f7bc7..0eceda1 100644
--- a/include/libnftables/chain.h
+++ b/include/libnftables/chain.h
@@ -65,6 +65,7 @@ struct nft_chain_list;
 
 struct nft_chain_list *nft_chain_list_alloc(void);
 void nft_chain_list_free(struct nft_chain_list *list);
+int nft_chain_list_is_empty(struct nft_chain_list *list);
 int nft_chain_list_foreach(struct nft_chain_list *chain_list, int (*cb)(struct nft_chain *t, void *data), void *data);
 
 void nft_chain_list_add(struct nft_chain *r, struct nft_chain_list *list);
diff --git a/include/libnftables/rule.h b/include/libnftables/rule.h
index 186c82c..cadd14d 100644
--- a/include/libnftables/rule.h
+++ b/include/libnftables/rule.h
@@ -73,6 +73,7 @@ struct nft_rule_list;
 
 struct nft_rule_list *nft_rule_list_alloc(void);
 void nft_rule_list_free(struct nft_rule_list *list);
+int nft_rule_list_is_empty(struct nft_rule_list *list);
 void nft_rule_list_add(struct nft_rule *r, struct nft_rule_list *list);
 int nft_rule_list_foreach(struct nft_rule_list *rule_list, int (*cb)(struct nft_rule *t, void *data), void *data);
 
diff --git a/include/libnftables/set.h b/include/libnftables/set.h
index 5c77945..4a94a85 100644
--- a/include/libnftables/set.h
+++ b/include/libnftables/set.h
@@ -41,6 +41,7 @@ struct nft_set_list;
 
 struct nft_set_list *nft_set_list_alloc(void);
 void nft_set_list_free(struct nft_set_list *list);
+int nft_set_list_is_empty(struct nft_set_list *list);
 void nft_set_list_add(struct nft_set *s, struct nft_set_list *list);
 int nft_set_list_foreach(struct nft_set_list *set_list, int (*cb)(struct nft_set *t, void *data), void *data);
 
diff --git a/include/libnftables/table.h b/include/libnftables/table.h
index 9445879..4fc19eb 100644
--- a/include/libnftables/table.h
+++ b/include/libnftables/table.h
@@ -53,6 +53,7 @@ struct nft_table_list;
 
 struct nft_table_list *nft_table_list_alloc(void);
 void nft_table_list_free(struct nft_table_list *list);
+int nft_table_list_is_empty(struct nft_table_list *list);
 int nft_table_list_foreach(struct nft_table_list *table_list, int (*cb)(struct nft_table *t, void *data), void *data);
 
 void nft_table_list_add(struct nft_table *r, struct nft_table_list *list);