===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/grep/binary.c,v
retrieving revision 1.11
retrieving revision 1.12
diff -u -r1.11 -r1.12
--- src/usr.bin/grep/binary.c	2004/05/06 19:42:16	1.11
+++ src/usr.bin/grep/binary.c	2004/05/06 20:18:51	1.12
@@ -1,4 +1,4 @@
-/*	$OpenBSD: binary.c,v 1.11 2004/05/06 19:42:16 millert Exp $	*/
+/*	$OpenBSD: binary.c,v 1.12 2004/05/06 20:18:51 otto Exp $	*/
 
 /*-
  * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
@@ -41,7 +41,7 @@
 	int		i, m;
 	int		ret = 0;
 
-	if (fseek(f, 0L, SEEK_SET) == -1)
+	if (isatty(fileno(f)) || fseek(f, 0L, SEEK_SET) == -1)
 		return 0;
 
 	if ((m = (int)fread(buf, 1, BUFSIZ, f)) == 0)