## Copyright (C) 2000 Paul Kienzle
##
## 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 2 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

## usage: strmatch(s, A [, 'exact'])
## Determines which entries of string matrix A match string s.  If
## 'exact' is not given, then s only needs to match A up to the length
## of s.  Null characters match blanks. Results are returned as a column
## vector.
function idx = strmatch(s,A,exact)
  if (nargin < 2 || nargin > 3)
    usage("strmatch(s,A,'exact')");
  endif

  istno = implicit_str_to_num_ok;
  dfi = do_fortran_indexing;
  unwind_protect
    implicit_str_to_num_ok = 1;
    do_fortran_indexing = 1;

    [nr, nc] = size (A);
    if (length (s) > nc)
      idx = [];
    else
      if (nargin == 3 && length(s) < nc) s(1,nc) = ' '; endif
      s (s==0) = ' ';
      A (A==0) = ' ';
      match = s(ones(size(A,1),1),:) == A(:,1:length(s));
      if (length(s) == 1)
	idx = find(match);
      else
      	idx = find(all(match')');
      endif
    endif

  unwind_protect_cleanup
    implicit_str_to_num_ok = istno;
    do_fortran_indexing = dfi;
  end_unwind_protect
endfunction