Rewrite update algorithm.

* src/common.h (namebuf_t): New typedef.
(namebuf_create, namebuf_free)
(namebuf_name): New prototypes.
(remname): New prototype.
* src/misc.c (struct namebuf): New structure.
(namebuf_create, namebuf_free)
(namebuf_name): New functions.
* src/create.c (dup_dir0): Remove is_avoided_name
checks. This is taken care of in update_archive.
* src/incremen.c (scan_directory): Use namebuf
to produce full file names.
* src/names.c (nametail): Remove extra level of
indirection. All uses updated.
(avoided_name_table, add_avoided_name)
(is_avoided_name): Remove.
* src/update.c (update_archive): Change algorithm.
Instead of adding unmodified files to the avoided_name
table, create namelist so that it contains only
modified files.

* tests/Makefile.am: Add update01.at, update02.at
* tests/testsuite.at: Likewise.
* tests/update.at (AT_KEYWORDS): Add update00.

tests/Makefile.am

@@ -130,6 +130,8 @@ TESTSUITE_AT = \
  spmvp10.at\
  truncate.at\
  update.at\
+ update01.at\
+ update02.at\
  volsize.at\
  volume.at\
  verbose.at\

tests/testsuite.at

@@ -207,6 +207,8 @@ m4_include([spmvp01.at])
 m4_include([spmvp10.at])
 
 m4_include([update.at])
+m4_include([update01.at])
+m4_include([update02.at])
 
 m4_include([volume.at])
 m4_include([volsize.at])

tests/update.at

@@ -23,9 +23,10 @@
 # References: <42AB0D28.6030706@mein-horde.de>
 #             by Martin Lohmeier <martin@mein-horde.de>
 #             on Sat, 11 Jun 2005 18:11:20 +0200
+#             http://lists.gnu.org/archive/html/bug-tar/2005-06/msg00024.html
 
 AT_SETUP([update unchanged directories])
-AT_KEYWORDS([update])
+AT_KEYWORDS([update update00])
 
 AT_TAR_CHECK([
 AT_SORT_PREREQ

tests/update01.at

@@ -0,0 +1,58 @@
+# Process this file with autom4te to create testsuite. -*- Autotest -*-
+
+# Test suite for GNU tar.
+# Copyright (C) 2009 Free Software Foundation, Inc.
+
+# This program 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, or (at your option)
+# any later version.
+
+# This program 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# Description: If dir is a directory and arc is a tar archive which
+# contains that directory, and dir contains some modifications added
+# after adding it to the archive, then `tar -u dir' would add dir/ to
+# the archive.
+# Last-Affected-Version: 1.22.90
+# References: <4AD4E703.80500@teclabs.eu>
+#             http://lists.gnu.org/archive/html/bug-tar/2009-10/msg00017.html
+
+AT_SETUP([update directories])
+AT_KEYWORDS([update update01])
+
+AT_TAR_CHECK([
+AT_SORT_PREREQ
+mkdir a
+genfile --file a/b
+
+tar cf arc a
+
+echo "separator"
+
+sleep 2
+genfile --file a/c
+
+tar ufv arc a
+echo "separator"
+tar tf arc | sort || exit 1
+],
+[0],
+[separator
+a/c
+separator
+a/
+a/b
+a/c
+])
+
+AT_CLEANUP
+

tests/update02.at

@@ -0,0 +1,55 @@
+# Process this file with autom4te to create testsuite. -*- Autotest -*-
+
+# Test suite for GNU tar.
+# Copyright (C) 2009 Free Software Foundation, Inc.
+
+# This program 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, or (at your option)
+# any later version.
+
+# This program 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# Description: See update01.at
+# Last-Affected-Version: 1.22.90
+# References: <4AD4E703.80500@teclabs.eu>
+#             http://lists.gnu.org/archive/html/bug-tar/2009-10/msg00017.html
+
+AT_SETUP([update changed files])
+AT_KEYWORDS([update update02])
+
+AT_TAR_CHECK([
+AT_SORT_PREREQ
+mkdir a
+genfile --file a/b
+
+tar cf arc a
+
+echo "separator"
+
+sleep 2
+touch a/b
+
+tar ufv arc a
+echo "separator"
+tar tf arc | sort || exit 1
+],
+[0],
+[separator
+a/b
+separator
+a/
+a/b
+a/b
+])
+
+AT_CLEANUP
+