From: Jim Meyering <jim@meyering.net>
Date: Sat, 11 Nov 1995 14:21:15 +0000 (+0000)
Subject: (main): Don't die when dev/ino of input and output are
X-Git-Tag: TEXTUTILS-1_13F~53
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24aec7f87ff14a3229d080007a77e1dc7ae79f2b;p=thirdparty%2Fcoreutils.git

(main): Don't die when dev/ino of input and output are
the same and the file descriptors correspond to stdin and stdout.
This is necessary on at least Digital UNIX (aka OSF1) 3.2C.
Otherwise, running `cat << X > $$' would fail with `cat: -: input
file is output file'.  From Jarkko Hietaniemi <jhi@epsilon.hut.fi>.
---

diff --git a/src/cat.c b/src/cat.c
index 77dec0e2e1..0038c19211 100644
--- a/src/cat.c
+++ b/src/cat.c
@@ -654,7 +654,8 @@ main (int argc, char **argv)
 	 files cannot be redirected to themselves.  */
 
       if (check_redirection
-	  && stat_buf.st_dev == out_dev && stat_buf.st_ino == out_ino)
+	  && stat_buf.st_dev == out_dev && stat_buf.st_ino == out_ino
+	  && (input_desc != fileno (stdin) || output_desc != fileno (stdout)))
 	{
 	  error (0, 0, _("%s: input file is output file"), infile);
 	  exit_stat = 1;