Adding upstream version 5.6.2.upstream/5.6.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 16 insertions, 3 deletions

diff --git a/src/xz/util.h b/src/xz/util.h
index 6d7e148..a2fdd05 100644
--- a/src/xz/util.h
+++ b/src/xz/util.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       util.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 /// \brief      Safe malloc() that never returns NULL
@@ -105,6 +104,20 @@ lzma_attribute((__format__(__printf__, 3, 4)))
 extern void my_snprintf(char **pos, size_t *left, const char *fmt, ...);
 
 
+/// \brief      Test if file descriptor is a terminal
+///
+/// For POSIX systems, this is a simple wrapper around isatty(). However on
+/// Windows, isatty() returns true for all character devices, not just
+/// terminals.
+///
+/// \param      fd    File descriptor to test
+///
+/// \return     bool:
+///             - true if file descriptor is a terminal
+///             - false otherwise
+extern bool is_tty(int fd);
+
+
 /// \brief      Test if stdin is a terminal
 ///
 /// If stdin is a terminal, an error message is printed and exit status set