Fix --one-top-level used together with --list.

* src/extract.c: Move one_top_level stuff to tar.c (decode_options).
* src/tar.c (option_conflict_error): New function.
(decode_options): Use option_conflict_error to complain about
conflicting options in a uniform manner.
Process one_top_level options here.
(request_stdin): Fix error message.
* tests/onetop04.at: New testcase: check --one-top-level with --list.
* tests/Makefile.am: Add new testcase.
* tests/testsuite.at: Add new testcase.

tests/Makefile.am

@@ -147,6 +147,7 @@ TESTSUITE_AT = \
  onetop01.at\
  onetop02.at\
  onetop03.at\
+ onetop04.at\
  opcomp01.at\
  opcomp02.at\
  opcomp03.at\

tests/onetop04.at

@@ -0,0 +1,38 @@
+# Process this file with autom4te to create testsuite. -*- Autotest -*-
+#
+# Test suite for GNU tar.
+# Copyright 2014 Free Software Foundation, Inc.
+#
+# This file is part of GNU tar.
+#
+# 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([tar --one-top-level --transform])
+AT_KEYWORDS([extract onetop onetop02])
+
+AT_TAR_CHECK([
+AT_SORT_PREREQ
+mkdir a
+genfile --file a/b
+genfile --file c
+tar cf a.tar a c
+tar -tf a.tar --one-top-level --transform 's/c/d/' --show-transformed | sort
+],
+[0],
+[a/
+a/b
+a/d
+])
+
+AT_CLEANUP

tests/testsuite.at

@@ -417,6 +417,7 @@ AT_BANNER([One top level])
 m4_include([onetop01.at])
 m4_include([onetop02.at])
 m4_include([onetop03.at])
+m4_include([onetop04.at])
 
 AT_BANNER([Star tests])
 m4_include([star/gtarfail.at])