--- a/scripts/ChangeLog	Wed Oct 25 03:26:36 2006 +0000
+++ b/scripts/ChangeLog	Wed Oct 25 03:36:46 2006 +0000
@@ -1,3 +1,10 @@
+2006-10-24  Bill Denney  <denney@seas.upenn.edu>
+
+	* miscellaneous/unpack.m, miscellaneous/bunzip2.m,
+	miscellaneous/gunzip.m: New files.
+	* miscellaneous/untar.m, miscellaneous/unzip.m:
+	Call unpack to do the real work.
+
 2006-10-24  John W. Eaton  <jwe@octave.org>
 
 	* plot/plot3.m: If we have a format string, then also pass using

--- a/scripts/miscellaneous/untar.m	Wed Oct 25 03:26:36 2006 +0000
+++ b/scripts/miscellaneous/untar.m	Wed Oct 25 03:36:46 2006 +0000
@@ -21,75 +21,22 @@
 ## @deftypefn {Function File} untar (@var{tarfile}, @var{dir})
 ## Unpack the TAR archive @var{tarfile} to the directory @var{dir}.
 ## If @var{dir} is not specified, it defaults to the current directory.
-## @seealso{tar, gzip, gunzip, zip, unzip}
+## @seealso{unpack, bzip2, bunzip2, tar, gzip, gunzip, zip, unzip}
 ## @end deftypefn
 
 ## Author: Søren Hauberg <hauberg@gmail.com>
-## Adapted-By: jwe
-
-function files = untar (tarfile, directory)
-
-  if (nargin == 1 || nargin == 2)
-
-    if (nargin == 1)
-      directory = ".";
-    endif
-
-    ## The file must exist (and be a file) and the directory must be a
-    ## string.
-    if (exist (tarfile, "file") && ischar (directory))
-
-      orig_dir = pwd ();
-
-      tarfile = canonicalize_file_name (tarfile);
-
-      s = stat (directory);
-      if (isempty (s))
-	[status, msg] = mkdir (directory);
-	if (! status)
-	  error ("untar: mkdir failed to create %s: %s", directory, msg);
-	endif
-      elseif (! S_ISDIR (s.mode))
-	error ("untar: %s: not a directory", directory);
-      endif
+## Adapted-By: jwe, Bill Denney
 
-      unwind_protect
-	chdir (directory);
-	[status, output] = system (sprintf ("tar -x -v -f %s", tarfile));
-      unwind_protect_cleanup
-	chdir (orig_dir);
-      end_unwind_protect
+function varargout = untar (files, outputdir)
 
-      if (status == 0)
-	if (nargout > 0)
-	  fs = filesep ();
-	  if (directory(end) != fs)
-	    directory = strcat (directory, fs);
-	  endif
-	  ## Sadly not reliable if a filename contains a newline
-	  ## character!
-	  if (output(end) == "\n")
-	    output(end) = [];
-	  endif
-	  files = cellstr (split (output, "\n"));
-	  if (! strcmp (directory, "."))
-	    nf = length (files);
-	    for i = 1:nf
-	      files{i} = strcat (directory, files{i});
-	    endfor
-	  endif
-	  files = files';
-	endif
-      else
-	error ("tar: tar exited with status = %s", status);
-      endif
-
-    else
-      error ("untar: expecting arguments to be character strings");
-    endif
-
-  else
-    print_usage ("untar");
+  if ! (nargin == 1 || nargin == 2)
+    print_usage ();
   endif
 
+  if (nargin == 1)
+    outputdir = ".";
+  endif
+  varargout = cell (1, nargout);
+  [varargout{:}] = unpack (files, outputdir, mfilename ());
+
 endfunction

--- a/scripts/miscellaneous/unzip.m	Wed Oct 25 03:26:36 2006 +0000
+++ b/scripts/miscellaneous/unzip.m	Wed Oct 25 03:36:46 2006 +0000
@@ -21,42 +21,22 @@
 ## @deftypefn {Function File} unzip (@var{zipfile}, @var{dir})
 ## Unpack the ZIP archive @var{zipfile} to the directory @var{dir}.
 ## If @var{dir} is not specified, it defaults to the current directory.
-## @seealso{tar, untar, gzip, gunzip, zip}
+## @seealso{unpack, bzip2, bunzip2, tar, untar, gzip, gunzip, zip}
 ## @end deftypefn
 
 ## Author: Søren Hauberg <hauberg@gmail.com>
-## Adapted-By: jwe
-
-function files = unzip (zipfile, dir)
-
-  if (nargin == 1 || nargin == 2)
-
-    if (nargin == 1)
-      dir = ".";
-    endif
-
-    if (ischar (zipfile) && ischar (dir))
-
-      [status, output] = system (sprintf ("unzip %s -d %s", zipfile, dir));
+## Adapted-By: jwe, Bill Denney
 
-      if (status == 0)
-	if (nargout > 0)
-	  ## Create list of extracted files.  It blows that there seems
-	  ## to be no way to get unzip to print a simple list of file
-	  ## names.
-	  files = strrep (output, "  inflating: ", "");
-	  files = cellstr (split (files, "\n"));
-	  files = files(2:end-1,:);
-	  files = files';
-	endif
-      else
-	error ("unzip: unzip exited with status = %d", status);
-      endif
-    endif
+function varargout = unzip (files, outputdir)
 
-  else
-    print_usage ("unzip");
+  if ! (nargin == 1 || nargin == 2)
+    print_usage ();
   endif
 
+  if (nargin == 1)
+    outputdir = ".";
+  endif
+  varargout = cell (1, nargout);
+  [varargout{:}] = unpack (files, outputdir, mfilename ());
+
 endfunction
-