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## Copyright (C) 1996 Kurt Hornik
##
## 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.
## usage: index (s, t)
##
## Returns the position of the first occurence of the string T in the
## string S or 0 if no occurence is found.
##
## NOTE: this function does not work for arrays of strings.
## Author: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>
## Adapted-By: jwe
function n = index (s, t)
## This is patterned after the AWK function of the same name.
if (nargin != 2)
usage ("index (s, t)");
endif
n = 0;
if (isstr (s) && isstr (t))
[nr_s, l_s] = size (s);
[nr_t, l_t] = size (t);
if (nr_s != 1 || nr_t != 1)
error ("index: arguments cannot be string arrays");
endif
if (l_t <= l_s)
tmp = l_s - l_t + 1;
for idx = 1 : tmp
if (strcmp (substr (s, idx, l_t), t))
n = idx;
return;
endif
endfor
endif
else
error ("index: expecting string arguments");
endif
endfunction
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