Allow escaped delimiters in transform expressions.

Patch provided by Charles McGarvey and Flavio Poletti.

* src/transform.c (parse_transform_expr): Allow escaped delimiters
in transform expressions.
* tests/xform02.at: New test case.
* tests/Makefile.am: Add xform02.at
* tests/testsuite.at: Include xform02.at
* THANKS: Update.

THANKS

@@ -78,6 +78,7 @@ Cesar Romani		romani@ifm.uni-hamburg.de
 Chad Hurwitz		churritz@cts.com
 Chance Reschke		creschke@usra.edu
 Charles Fu		ccwf@klab.caltech.edu
+Charles McGarvey        chazmcgarvey@brokenzipper.com
 Charles Lopes		Charles.Lopes@infm.ulst.ac.uk
 Charles M. Hannum	mycroft@gnu.org
 Chip Salzenberg		tct!chip
@@ -173,6 +174,7 @@ Erik D. Frederick	edf@deckard.mc.duke.edu
 Esa Karell		karell@cs.helsinki.fi
 Ezra Peisach		epeisach@mit.edu
 Fabio d'Alessi		cars@civ.bio.unipd.it
+Flavio Poletti          polettix@gmail.com
 Frank Heckenbach	frank@g-n-u.de
 Frank Koenen		koenfr@lidp.com
 Franz-Werner Gergen	gergen@edvulx.mpi-stuttgart.mpg.de

src/transform.c

@@ -378,13 +378,15 @@ parse_transform_expr (const char *expr)
 	      break;
 
 	    default:
-	      /* Try to be nice */
-	      {
-		char buf[2];
-		buf[0] = '\\';
-		buf[1] = *cur;
-		add_literal_segment (tf, buf, buf + 2);
-	      }
+	      if (*cur == delim)
+		add_char_segment (tf, delim);
+	      else
+		{
+		  char buf[2];
+		  buf[0] = '\\';
+		  buf[1] = *cur;
+		  add_literal_segment (tf, buf, buf + 2);
+		}
 	      cur++;
 	      break;
 	    }

tests/Makefile.am

@@ -228,6 +228,7 @@ TESTSUITE_AT = \
  version.at\
  xform-h.at\
  xform01.at\
+ xform02.at\
  star/gtarfail.at\
  star/gtarfail2.at\
  star/multi-fail.at\

tests/testsuite.at

@@ -1,7 +1,7 @@
 # Process this file with autom4te to create testsuite. -*- Autotest -*-
 
 # Test suite for GNU tar.
-# Copyright 2004-2008, 2010-2015 Free Software Foundation, Inc.
+# Copyright 2004-2008, 2010-2016 Free Software Foundation, Inc.
 
 # This file is part of GNU tar.
 
@@ -247,6 +247,7 @@ m4_include([append04.at])
 AT_BANNER([Transforms])
 m4_include([xform-h.at])
 m4_include([xform01.at])
+m4_include([xform02.at])
 
 AT_BANNER([Exclude])
 m4_include([exclude.at])

tests/xform02.at

@@ -0,0 +1,36 @@
+# Process this file with autom4te to create testsuite. -*- Autotest -*-
+
+# Test suite for GNU tar.
+# Copyright 2009-2010, 2013-2016 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([transforming escaped delimiters on create])
+AT_KEYWORDS([transform xform delimiter])
+
+AT_TAR_CHECK([
+genfile --file file
+tar cvf /dev/null file \
+   --transform='s/file/other\/name/' \
+   --show-transformed-name
+],
+[0],
+[other/name
+])
+
+AT_CLEANUP
+
+# End of xform02.at