From bb8235cbe9e8876efd5df1148c4072ded5b4b38e Mon Sep 17 00:00:00 2001
From: nicm <nicm@openbsd.org>
Date: Wed, 20 May 2015 06:39:02 +0000
Subject: [PATCH] Return empty string if format is empty rather than attempting
 to allocate zero bytes.

---
 usr.bin/tmux/format.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/usr.bin/tmux/format.c b/usr.bin/tmux/format.c
index 8b47b361f92..9bf9a1cd927 100644
--- a/usr.bin/tmux/format.c
+++ b/usr.bin/tmux/format.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: format.c,v 1.66 2015/05/12 15:29:29 nicm Exp $ */
+/* $OpenBSD: format.c,v 1.67 2015/05/20 06:39:02 nicm Exp $ */
 
 /*
  * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -335,7 +335,7 @@ format_expand_time(struct format_tree *ft, const char *fmt, time_t t)
 	size_t		 tmplen;
 	struct tm	*tm;
 
-	if (fmt == NULL)
+	if (fmt == NULL || *fmt == '\0')
 		return (xstrdup(""));
 
 	tm = localtime(&t);
-- 
2.20.1