libnftnl: constify object arguments to various functions

flow table support needs constant object arguments to printing functions
to avoid ugly casts. While at it, also constify object arguments to message
construction, destructor and a few helper functions.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 15 insertions, 14 deletions

diff --git a/src/chain.c b/src/chain.c
index abfc58f..c988bdd 100644
--- a/src/chain.c
+++ b/src/chain.c
@@ -93,7 +93,7 @@ struct nftnl_chain *nftnl_chain_alloc(void)
 }
 EXPORT_SYMBOL_ALIAS(nftnl_chain_alloc, nft_chain_alloc);
 
-void nftnl_chain_free(struct nftnl_chain *c)
+void nftnl_chain_free(const struct nftnl_chain *c)
 {
 	if (c->table != NULL)
 		xfree(c->table);
@@ -833,8 +833,8 @@ int nftnl_chain_parse_file(struct nftnl_chain *c, enum nftnl_parse_type type,
 }
 EXPORT_SYMBOL_ALIAS(nftnl_chain_parse_file, nft_chain_parse_file);
 
-static int nftnl_chain_export(char *buf, size_t size, struct nftnl_chain *c,
-			    int type)
+static int nftnl_chain_export(char *buf, size_t size,
+			      const struct nftnl_chain *c, int type)
 {
 	NFTNL_BUF_INIT(b, buf, size);
 
@@ -873,7 +873,7 @@ static int nftnl_chain_export(char *buf, size_t size, struct nftnl_chain *c,
 }
 
 static int nftnl_chain_snprintf_default(char *buf, size_t size,
-				      struct nftnl_chain *c)
+					const struct nftnl_chain *c)
 {
 	int ret, len = size, offset = 0;
 
@@ -899,8 +899,9 @@ static int nftnl_chain_snprintf_default(char *buf, size_t size,
 	return offset;
 }
 
-static int nftnl_chain_cmd_snprintf(char *buf, size_t size, struct nftnl_chain *c,
-				  uint32_t cmd, uint32_t type, uint32_t flags)
+static int nftnl_chain_cmd_snprintf(char *buf, size_t size,
+				    const struct nftnl_chain *c, uint32_t cmd,
+				    uint32_t type, uint32_t flags)
 {
 	int ret, len = size, offset = 0;
 
@@ -927,23 +928,23 @@ static int nftnl_chain_cmd_snprintf(char *buf, size_t size, struct nftnl_chain *
 	return offset;
 }
 
-int nftnl_chain_snprintf(char *buf, size_t size, struct nftnl_chain *c,
-		       uint32_t type, uint32_t flags)
+int nftnl_chain_snprintf(char *buf, size_t size, const struct nftnl_chain *c,
+			 uint32_t type, uint32_t flags)
 {
 	return nftnl_chain_cmd_snprintf(buf, size, c, nftnl_flag2cmd(flags), type,
 				      flags);
 }
 EXPORT_SYMBOL_ALIAS(nftnl_chain_snprintf, nft_chain_snprintf);
 
-static inline int nftnl_chain_do_snprintf(char *buf, size_t size, void *c,
-					uint32_t cmd, uint32_t type,
-					uint32_t flags)
+static inline int nftnl_chain_do_snprintf(char *buf, size_t size, const void *c,
+					  uint32_t cmd, uint32_t type,
+					  uint32_t flags)
 {
 	return nftnl_chain_snprintf(buf, size, c, type, flags);
 }
 
-int nftnl_chain_fprintf(FILE *fp, struct nftnl_chain *c, uint32_t type,
-		      uint32_t flags)
+int nftnl_chain_fprintf(FILE *fp, const struct nftnl_chain *c, uint32_t type,
+			uint32_t flags)
 {
 	return nftnl_fprintf(fp, c, NFTNL_CMD_UNSPEC, type, flags,
 			   nftnl_chain_do_snprintf);
@@ -980,7 +981,7 @@ void nftnl_chain_list_free(struct nftnl_chain_list *list)
 }
 EXPORT_SYMBOL_ALIAS(nftnl_chain_list_free, nft_chain_list_free);
 
-int nftnl_chain_list_is_empty(struct nftnl_chain_list *list)
+int nftnl_chain_list_is_empty(const struct nftnl_chain_list *list)
 {
 	return list_empty(&list->list);
 }