From a39c314835fe4ef476a81474507378e476def565 Mon Sep 17 00:00:00 2001
From: simon <simon@cda61777-01e9-0310-a592-d414129be87e>
Date: Mon, 26 Jun 2000 12:55:47 +0000
Subject: [PATCH 1/1] Avoid the ldisc passing zero-length strings to
 back->send(). VMS sshd has interesting behaviour on receiving a zero-length
 SSH data packet.

git-svn-id: svn://svn.tartarus.org/sgt/putty@508 cda61777-01e9-0310-a592-d414129be87e
---
 ldisc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/ldisc.c b/ldisc.c
index dda7cc36..59bddb22 100644
--- a/ldisc.c
+++ b/ldisc.c
@@ -123,7 +123,8 @@ static void term_send(char *buf, int len) {
 	    }
 	    break;
 	  case CTRL('M'):	       /* send with newline */
-	    back->send(term_buf, term_buflen);
+	    if (term_buflen > 0)
+                back->send(term_buf, term_buflen);
 	    if (cfg.protocol == PROT_RAW)
 	        back->send("\r\n", 2);
 	    else
@@ -153,7 +154,8 @@ static void simple_send(char *buf, int len) {
 	    term_buflen--;
 	}
     }
-    back->send(buf, len);
+    if (len > 0)
+        back->send(buf, len);
 }
 
 Ldisc ldisc_term = { term_send };
-- 
2.11.0