From 3ffd5d81a43210c8da56da5c5b3637d3f8bc63c7 Mon Sep 17 00:00:00 2001
From: Lasse Collin <lasse.collin@tukaani.org>
Date: Wed, 13 Jan 2010 19:10:25 +0200
Subject: [PATCH] Don't read compressed data from a terminal or write it to a
 terminal even if --force is specified.

It just seems more reasonable this way.

The new behavior matches bzip2. The old one matched gzip.
---
 src/xz/main.c | 20 +++++++++-----------
 src/xz/util.c |  8 ++++----
 2 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/src/xz/main.c b/src/xz/main.c
index b197ca43..7445e98a 100644
--- a/src/xz/main.c
+++ b/src/xz/main.c
@@ -168,8 +168,8 @@ main(int argc, char **argv)
 		message_set_files(args.arg_count);
 
 	// Refuse to write compressed data to standard output if it is
-	// a terminal and --force wasn't used.
-	if (opt_mode == MODE_COMPRESS && !opt_force) {
+	// a terminal.
+	if (opt_mode == MODE_COMPRESS) {
 		if (opt_stdout || (args.arg_count == 1
 				&& strcmp(args.arg_names[0], "-") == 0)) {
 			if (is_tty_stdout()) {
@@ -188,16 +188,14 @@ main(int argc, char **argv)
 	// were given, parse_args() gave us a fake "-" filename.
 	for (size_t i = 0; i < args.arg_count && !user_abort; ++i) {
 		if (strcmp("-", args.arg_names[i]) == 0) {
-			// Processing from stdin to stdout. Unless --force
-			// was used, check that we aren't writing compressed
-			// data to a terminal or reading it from terminal.
-			if (!opt_force) {
-				if (opt_mode == MODE_COMPRESS) {
-					if (is_tty_stdout())
-						continue;
-				} else if (is_tty_stdin()) {
+			// Processing from stdin to stdout. Check that we
+			// aren't writing compressed data to a terminal or
+			// reading it from a terminal.
+			if (opt_mode == MODE_COMPRESS) {
+				if (is_tty_stdout())
 					continue;
-				}
+			} else if (is_tty_stdin()) {
+				continue;
 			}
 
 			// It doesn't make sense to compress data from stdin
diff --git a/src/xz/util.c b/src/xz/util.c
index 9f6bdddd..c0ac5384 100644
--- a/src/xz/util.c
+++ b/src/xz/util.c
@@ -223,8 +223,8 @@ is_tty_stdin(void)
 	const bool ret = isatty(STDIN_FILENO);
 
 	if (ret)
-		message_error(_("Compressed data not read from a terminal "
-				"unless `--force' is used."));
+		message_error(_("Compressed data cannot be read from "
+				"a terminal"));
 
 	return ret;
 }
@@ -236,8 +236,8 @@ is_tty_stdout(void)
 	const bool ret = isatty(STDOUT_FILENO);
 
 	if (ret)
-		message_error(_("Compressed data not written to a terminal "
-				"unless `--force' is used."));
+		message_error(_("Compressed data cannot be written to "
+				"a terminal"));
 
 	return ret;
 }