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+++ b/scripts/strings/strjust.m
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+## Copyright (C) 2000 Paul Kienzle
+##
+## This file is part of Octave.
+##
+## Octave 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 2, or (at your option)
+## any later version.
+##
+## Octave 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 Octave; see the file COPYING.  If not, write to the Free
+## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} strjust (@var{s}, ["left"|"right"|"center"])
+## Shift the non-blank text of @var{s} to the left, right or center of
+## the string.  If @var{s} is a string array, justify each string in the
+## array.  Null characters are replaced by blanks.  If no justification
+## is specified, then all rows are right-justified.
+## @end deftypefn
+
+function x = strjust (x, just)
+
+  if (nargin < 1 || nargin > 2)
+    usage ("strjust (s, ['left'|'right'|'center'])");
+  endif
+
+  if (nargin == 1)
+    just = "right";
+  endif
+
+  just = tolower (just);
+
+  dfi = do_fortran_indexing;
+  unwind_protect
+    do_fortran_indexing = 1;
+
+    ## convert nulls to blanks
+    idx = find (toascii (x) == 0);
+    if (! isempty (idx))
+      x(idx) = " ";
+    endif
+
+    ## For all cases, left, right and center, the algorithm is the same.
+    ## Find the number of blanks at the left/right end to determine the
+    ## shift, rotate the row index by using mod with that shift, then
+    ## translate the shifted row index into an array index.
+    [nr, nc] = size (x);
+    idx = (x' != " ");
+    if (strcmp (just, "right"))
+      [N, hi] = max (cumsum (idx));
+      shift = hi;
+    elseif (strcmp (just, "left"))
+      [N, lo] = max (cumsum (flipud (idx)));
+      shift = (nc - lo);
+    else
+      [N, hi] = max (cumsum (idx));
+      [N, lo] = max (cumsum (flipud (idx)));
+      shift = ceil (nc - (lo-hi)/2);
+    endif
+    idx = rem (ones(nr,1)*[0:nc-1] + shift'*ones(1,nc), nc);
+    x = x (idx*nr + [1:nr]'*ones(1,nc));
+
+  unwind_protect_cleanup
+    do_fortran_indexing = dfi;
+  end_unwind_protect
+
+endfunction