[libnftables PATCH 1/3] nat: xml: fix xml_snprintf buffer offset

[Arturo Borrero <arturo.borrero.glez@gmail.com>]

This patch fix the buffer offset of the nat snprintf function,
so elements are properly printed.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
---
 src/expr/nat.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/expr/nat.c b/src/expr/nat.c
index a76f5b5..448d2e3 100644
--- a/src/expr/nat.c
+++ b/src/expr/nat.c
@@ -336,19 +336,21 @@ nft_rule_expr_nat_snprintf_xml(char *buf, size_t size,
 		break;
 	}
 
-	ret = snprintf(buf, len, "<family>%s</family>",
+	ret = snprintf(buf+offset, len, "<family>%s</family>",
 		       nat->family == AF_INET ? "AF_INET" : "AF_INET6");
 	SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
 
 	if (e->flags & (1 << NFT_EXPR_NAT_REG_ADDR_MIN)) {
-		ret = snprintf(buf, len, "<sreg_addr_min_v4>%u</sreg_addr_min_v4>"
-				" <sreg_addr_max_v4>%u</sreg_addr_max_v4> ",
+		ret = snprintf(buf+offset, len,
+				"<sreg_addr_min_v4>%u</sreg_addr_min_v4>"
+				"<sreg_addr_max_v4>%u</sreg_addr_max_v4>",
 			       nat->sreg_addr_min, nat->sreg_addr_max);
 		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
 	}
 
 	if (e->flags & (1 << NFT_EXPR_NAT_REG_PROTO_MIN)) {
-		ret = snprintf(buf, len, "<sreg_proto_min>%u</sreg_proto_min>"
+		ret = snprintf(buf+offset, len,
+				"<sreg_proto_min>%u</sreg_proto_min>"
 				"<sreg_proto_max>%u</sreg_proto_max>",
 		       nat->sreg_proto_min, nat->sreg_proto_max);
 		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);