From 8423ebbe8b671c30a56bd6647675784d55023d5c Mon Sep 17 00:00:00 2001
From: Olaf Bergmann <bergmann@tzi.org>
Date: Wed, 2 Aug 2017 21:17:07 +0200
Subject: [PATCH] client.c: allow empty user names

Zero-length strings passed to -u are valid user names for DTLS.
The function cmdline_read_user() therefore returns 0 when the
argument passed with option '-u' is an empty string.
---
 examples/client.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/examples/client.c b/examples/client.c
index 7e942566..24339de5 100644
--- a/examples/client.c
+++ b/examples/client.c
@@ -1023,9 +1023,8 @@ cmdline_read_user(char *arg, unsigned char *buf, size_t maxlen) {
   size_t len = strnlen(arg, maxlen);
   if (len) {
     memcpy(buf, arg, len);
-    return len;
   }
-  return -1;
+  return len;
 }
 
 static ssize_t