Options to control option handling in file lists.

The --verbatim-files-from option disables option handling in
file lists.  The --no-verbatim-files-from reverts its effect.

The --null option implies --verbatim-files-from.  This restores
the documented behavior, broken by 26538c9b.

* src/common.h (verbatim_files_from_option): New global.
* src/names.c (name_elt): New member: file.verbatim
(name_add_file): Take 'verbatim' state as its third parameter.
(read_next_name): Don't call handle_option if file.verbatim
is set.
* src/tar.c: New options --verbatim-files-from and
--no-verbatim-files-from.

* doc/tar.texi: Document --verbatim-files-from and
--no-verbatim-files-from options.
* NEWS: Update.
* configure.ac: Version 1.28.90

* tests/T-null2.at: New testcase.
* tests/Makefile.am: Update.
* tests/testsuite.at: Update.

tests/Makefile.am

@@ -1,6 +1,6 @@
 # Makefile for GNU tar regression tests.
 
-# Copyright 1996-1997, 1999-2001, 2003-2007, 2009, 2012-2013 Free Software
+# Copyright 1996-1997, 1999-2001, 2003-2007, 2009, 2012-2015 Free Software
 
 # This file is part of GNU tar.
 
@@ -47,6 +47,7 @@ TESTSUITE_AT = \
  T-dir01.at\
  T-empty.at\
  T-null.at\
+ T-null2.at\
  T-rec.at\
  T-zfile.at\
  T-nonl.at\

tests/T-null2.at

@@ -0,0 +1,43 @@
+# This file is part of test suite for GNU tar. -*- Autotest -*-
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU tar is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# GNU tar is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([--null enables verbatim reading])
+AT_KEYWORDS([files-from null T-null2 T-verbatim])
+
+# According to the docs, --null should read each line from the file
+# list verbatim.  This feature was broken by commit 26538c9b (tar version
+# 1.27).
+
+AT_TAR_CHECK([
+AT_DATA([file-list],[a
+-b
+--c d
+])
+
+genfile -f a
+genfile -f -b
+genfile -f '--c d'
+
+cat file-list | tr '\n' '\0' | tar -c -f archive -v --null -T -
+],
+[0],
+[a
+-b
+--c d
+],
+[],[],[],[ustar]) # Testing one format is enough
+
+AT_CLEANUP

tests/testsuite.at

@@ -1,7 +1,7 @@
 # Process this file with autom4te to create testsuite. -*- Autotest -*-
 
 # Test suite for GNU tar.
-# Copyright 2004-2008, 2010-2014 Free Software Foundation, Inc.
+# Copyright 2004-2008, 2010-2015 Free Software Foundation, Inc.
 
 # This file is part of GNU tar.
 
@@ -203,6 +203,7 @@ m4_include([T-rec.at])
 m4_include([T-cd.at])
 m4_include([T-empty.at])
 m4_include([T-null.at])
+m4_include([T-null2.at])
 m4_include([T-zfile.at])
 m4_include([T-nonl.at])
 m4_include([T-dir00.at])