From 398598dbbe5e533ca10d93c690becaa66f589b75 Mon Sep 17 00:00:00 2001
From: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Mon, 30 Mar 2015 21:25:23 +0200
Subject: [PATCH] paste: fix crash with empty delimiter

reproduce:
	paste -d '' /dev/null
or
	paste -d '\0' /dev/null

show usage() in these cases.
---
 paste.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/paste.c b/paste.c
index f90f37f..5ccda3a 100644
--- a/paste.c
+++ b/paste.c
@@ -109,6 +109,8 @@ main(int argc, char *argv[])
 	unescape(adelim);
 	delim = ereallocarray(NULL, utflen(adelim) + 1, sizeof(*delim));
 	len = utftorunestr(adelim, delim);
+	if (!len)
+		usage();
 
 	/* populate file list */
 	dsc = ereallocarray(NULL, argc, sizeof(*dsc));