From 7f686722f7ffba4634b9a531cb3e8fdd4addfae8 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 29 May 2019 14:03:18 +0900
Subject: [PATCH] util: introduce format_ifname()

---
 src/basic/format-util.c | 10 ++++++++++
 src/basic/format-util.h |  3 +++
 src/basic/meson.build   |  1 +
 3 files changed, 14 insertions(+)
 create mode 100644 src/basic/format-util.c

diff --git a/src/basic/format-util.c b/src/basic/format-util.c
new file mode 100644
index 0000000000..39ef2fceef
--- /dev/null
+++ b/src/basic/format-util.c
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "format-util.h"
+#include "memory-util.h"
+
+char *format_ifname(int ifindex, char buf[static IF_NAMESIZE + 1]) {
+        /* Buffer is always cleared */
+        memzero(buf, IF_NAMESIZE + 1);
+        return if_indextoname(ifindex, buf);
+}
diff --git a/src/basic/format-util.h b/src/basic/format-util.h
index dece5d3a67..9925a5e991 100644
--- a/src/basic/format-util.h
+++ b/src/basic/format-util.h
@@ -2,6 +2,7 @@
 #pragma once
 
 #include <inttypes.h>
+#include <net/if.h>
 
 #if SIZEOF_PID_T == 4
 #  define PID_PRI PRIi32
@@ -65,3 +66,5 @@
 #else
 #  error Unknown ino_t size
 #endif
+
+char *format_ifname(int ifindex, char buf[static IF_NAMESIZE + 1]);
diff --git a/src/basic/meson.build b/src/basic/meson.build
index 7d281c8841..d6caf28f14 100644
--- a/src/basic/meson.build
+++ b/src/basic/meson.build
@@ -56,6 +56,7 @@ basic_sources = files('''
         fd-util.h
         fileio.c
         fileio.h
+        format-util.c
         format-util.h
         fs-util.c
         fs-util.h