From e4466b68cc40b752e5c079afbfbadbb06489461e Mon Sep 17 00:00:00 2001
From: "m. allan noah" <kitno-guest@alioth.debian.org>
Date: Wed, 10 Feb 2010 20:56:25 -0500
Subject: [PATCH] exit with error if stdout isatty()

---
 ChangeLog            | 1 +
 frontend/scanimage.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 379fab48c..dfa0067cf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,6 @@
 2010-02-10 m. allan noah <kitno455 at gmail dot com>
 	* acinclude.m4, configure: missing $ in variable expansion
+	* frontend/scanimage.c: exit with error if stdout isatty()
 
 2010-02-10 m. allan noah <kitno455 at gmail dot com>
 	* backend/cardscan.[ch], backend/cardscan.conf.in,
diff --git a/frontend/scanimage.c b/frontend/scanimage.c
index 39b36faa2..8657a727a 100644
--- a/frontend/scanimage.c
+++ b/frontend/scanimage.c
@@ -2208,6 +2208,11 @@ List of available devices:", prog_name);
 		 "Scanning %d pages, incrementing by %d, numbering from %d\n",
 		 batch_count, batch_increment, batch_start_at);
 
+      else if(isatty(fileno(stdout))){
+	fprintf (stderr,"%s: output is not a file, exiting\n", prog_name);
+        exit (1);
+      }
+
       do
 	{
 	  char path[PATH_MAX];