1 files changed, 64 insertions, 0 deletions
diff --git a/src/print_ifindex.c b/src/print_ifindex.c
new file mode 100644
index 000000000..b6e5470b3
--- /dev/null
+++ b/src/print_ifindex.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2001-2018 The strace developers.
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include "defs.h"
+#include <net/if.h>
+
+#ifdef HAVE_IF_INDEXTONAME
+# include "xstring.h"
+
+# define INI_PFX "if_nametoindex(\""
+# define INI_SFX "\")"
+# define IFNAME_QUOTED_SZ (sizeof(IFNAMSIZ) * 4 + 3)
+
+const char *
+get_ifname(const unsigned int ifindex)
+{
+	static char name_quoted_buf[IFNAME_QUOTED_SZ];
+	char name_buf[IFNAMSIZ];
+
+	if (!if_indextoname(ifindex, name_buf))
+		return NULL;
+
+	if (string_quote(name_buf, name_quoted_buf, sizeof(name_buf),
+			 QUOTE_0_TERMINATED | QUOTE_OMIT_LEADING_TRAILING_QUOTES,
+			 NULL))
+		return NULL;
+
+	return name_quoted_buf;
+}
+
+static const char *
+sprint_ifname(const unsigned int ifindex)
+{
+	static char res[IFNAME_QUOTED_SZ + sizeof(INI_PFX INI_SFX)];
+
+	const char *name_quoted = get_ifname(ifindex);
+
+	if (!name_quoted)
+		return NULL;
+
+	xsprintf(res, INI_PFX "%s" INI_SFX, name_quoted);
+
+	return res;
+}
+
+#else /* !HAVE_IF_INDEXTONAME */
+
+const char *get_ifname(const unsigned int ifindex) { return NULL; }
+
+#endif /* HAVE_IF_INDEXTONAME */
+
+void
+print_ifindex(const unsigned int ifindex)
+{
+#ifdef HAVE_IF_INDEXTONAME
+	print_xlat_ex(ifindex, sprint_ifname(ifindex), XLAT_STYLE_FMT_U);
+#else
+	tprintf("%u", ifindex);
+#endif
+}