[libnftables PATCH 13/13] jansson: Add nft_jansson_family function

[Alvaro Neira <alvaroneay@gmail.com>]

From: Álvaro Neira Ayuso <alvaroneay@gmail.com>

Refactor some existing code with the new function nft_jansson_family

Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
---
 src/chain.c    |   10 ++--------
 src/internal.h |    1 +
 src/jansson.c  |   18 ++++++++++++++++++
 src/table.c    |    9 ++-------
 4 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/src/chain.c b/src/chain.c
index e2e6f90..a6d99ca 100644
--- a/src/chain.c
+++ b/src/chain.c
@@ -517,14 +517,8 @@ static int nft_chain_json_parse(struct nft_chain *c, char *json)
 
 	nft_chain_attr_set_u64(c, NFT_CHAIN_ATTR_PACKETS, uval64);
 
-	valstr = nft_jansson_value_parse_str(root, "family");
-
-	if (valstr == NULL)
-		goto err;
-
-	val32 = nft_str2family(valstr);
-	if (val32 == -1)
-		goto err;
+	if (nft_jansson_parse_family(root, &val32) != 0)
+		return -1;
 
 	nft_chain_attr_set_u32(c, NFT_CHAIN_ATTR_FAMILY, val32);
 
diff --git a/src/internal.h b/src/internal.h
index 17d1286..62eb3c5 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -49,6 +49,7 @@ int nft_jansson_value_parse_val(json_t *root, const char *tag,
 const char *nft_jansson_value_parse_str(json_t *root, const char *tag);
 bool nft_jansson_node_exist(json_t *root, const char *tag);
 json_t *nft_jansson_get_root(char *json, const char *tag, json_error_t *err);
+int nft_jansson_parse_family(json_t *root, void *out);
 #endif
 
 const char *nft_family2str(uint32_t family);
diff --git a/src/jansson.c b/src/jansson.c
index 4c778d9..cc3ab23 100644
--- a/src/jansson.c
+++ b/src/jansson.c
@@ -90,4 +90,22 @@ json_t *nft_jansson_get_root(char *json, const char *tag, json_error_t *err)
 
 	return root;
 }
+int nft_jansson_parse_family(json_t *root, void *out)
+{
+	const char *str;
+	int family;
+
+	str = nft_jansson_value_parse_str(root, "family");
+	if (str == NULL)
+		return -1;
+
+	family = nft_str2family(str);
+	if (family < 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	memcpy(out, &family, sizeof(family));
+	return 0;
+}
 #endif
diff --git a/src/table.c b/src/table.c
index 18d9077..1fa0dac 100644
--- a/src/table.c
+++ b/src/table.c
@@ -285,13 +285,8 @@ static int nft_table_json_parse(struct nft_table *t, char *json)
 
 	nft_table_attr_set_str(t, NFT_TABLE_ATTR_NAME, strdup(str));
 
-	str = nft_jansson_value_parse_str(root, "family");
-	if (str == NULL)
-		goto err;
-
-	family = nft_str2family(str);
-	if (family < 0)
-		goto err;
+	if (nft_jansson_parse_family(root, &family) != 0)
+		return -1;
 
 	nft_table_attr_set_u32(t, NFT_TABLE_ATTR_FAMILY, family);
 

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