netdev - [PATCH iproute2 v3 4/7] ip6/tunnel: Unify flowlabel printing

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Date:   Mon,  8 Jan 2018 19:04:29 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2 v3 4/7] ip6/tunnel: Unify flowlabel printing

Use @s2 buffer to store string representation of
flowlabel and get rid of extra SPRINT_BUF(): no
need to preserve @s2 contents for later.

Use print_string(PRINT_ANY, ...) with prepared by
snprintf() string for both PRINT_JSON and PRINT_FP
cases.

Omit flowlabel from output if no flowinfo attribute
is given and IP6_TNL_F_USE_ORIG_FLOWLABEL isn't set.

Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
---
 ip/link_gre6.c   |   15 ++++-----------
 ip/link_ip6tnl.c |   14 ++++----------
 2 files changed, 8 insertions(+), 21 deletions(-)

diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index a02dd4a..1205946 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -452,18 +452,11 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 			   "ip6_tnl_f_use_orig_flowlabel",
 			   "flowlabel inherit ",
 			   true);
-	} else {
-		if (is_json_context()) {
-			SPRINT_BUF(b1);
-
-			snprintf(b1, sizeof(b1), "0x%05x",
-				 ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
-			print_string(PRINT_JSON, "flowlabel", NULL, b1);
+	} else if (tb[IFLA_GRE_FLOWINFO]) {
+		__u32 val = ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL);
 
-		} else {
-			fprintf(f, "flowlabel 0x%05x ",
-				ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
-		}
+		snprintf(s2, sizeof(s2), "0x%05x", val);
+		print_string(PRINT_ANY, "flowlabel", "flowlabel %s ", s2);
 	}
 
 	if (flags & IP6_TNL_F_USE_ORIG_TCLASS) {
diff --git a/ip/link_ip6tnl.c b/ip/link_ip6tnl.c
index 05322fd..7000056 100644
--- a/ip/link_ip6tnl.c
+++ b/ip/link_ip6tnl.c
@@ -421,17 +421,11 @@ static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb
 			   "ip6_tnl_f_use_orig_flowlabel",
 			   "flowlabel inherit ",
 			   true);
-	} else {
-		if (is_json_context()) {
-			SPRINT_BUF(b1);
+	} else if (tb[IFLA_IPTUN_FLOWINFO]) {
+		__u32 val = ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL);
 
-			snprintf(b1, sizeof(b1), "0x%05x",
-				 ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
-			print_string(PRINT_JSON, "flowlabel", NULL, b1);
-		} else {
-			printf("flowlabel 0x%05x ",
-			       ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
-		}
+		snprintf(s2, sizeof(s2), "0x%05x", val);
+		print_string(PRINT_ANY, "flowlabel", "flowlabel %s ", s2);
 	}
 
 	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
-- 
1.7.10.4