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annotate scripts/strings/findstr.m @ 2272:e97fba45f0a3

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[project @ 1996-05-24 02:40:06 by jwe] Initial revision
author jwe
date Fri, 24 May 1996 02:40:06 +0000
parents
children 38fea6d34daf
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1 # Copyright (C) 1996 John W. Eaton
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2 #
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3 # This file is part of Octave.
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4 #
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5 # Octave is free software; you can redistribute it and/or modify it
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6 # under the terms of the GNU General Public License as published by the
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7 # Free Software Foundation; either version 2, or (at your option) any
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8 # later version.
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9 #
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 # for more details.
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14 #
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15 # You should have received a copy of the GNU General Public License
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16 # along with Octave; see the file COPYING. If not, write to the Free
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17 # Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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18
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19 function v = findstr (s, t)
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20
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21 # usage: findstr (s, t)
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22 #
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23 # Returns the vector of all positions in the longer of the two strings
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24 # S and T where an occurence of the shorter of the two starts.
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25
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26 # Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>.
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27
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28 if (nargin != 2)
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29 usage ("findstr (s, t)");
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30 endif
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31
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32 if (isstr (s) && isstr (t))
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33
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34 # Make S be the longer string.
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35
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36 if (length (s) < length (t))
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37 tmp = s;
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38 s = t;
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39 t = tmp;
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40 endif
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41
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42 s = toascii (s);
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43 t = toascii (t);
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44
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45 ind = 1 : length (t);
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46 limit = length (s) - length (t) + 1;
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47 v = zeros (1, limit);
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48 i = 0;
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49
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50 for k = 1 : limit
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51 if (s (ind + k - 1) == t)
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52 v (++i) = k;
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53 endif
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54 endfor
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55
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56 if (i > 0)
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57 v = v (1:i);
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58 else
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59 v = [];
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60 endif
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61
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62 else
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63 error ("findstr: both arguments must be strings");
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64 endif
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65
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66 endfunction