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1 # Copyright (C) 1996 Kurt Hornik |
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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 n = index (s, t) |
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20 |
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21 # usage: index (s, t) |
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22 # |
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23 # Returns the position of the first occurence of the string T in the |
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24 # string S or 0 if no occurence is found. |
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25 # |
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26 # NOTE: this function does not work for arrays of strings. |
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27 |
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28 # This is patterned after the AWK function of the same name. |
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29 |
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30 # Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>. |
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31 |
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32 if (nargin != 2) |
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33 usage ("index (s, t)"); |
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34 endif |
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35 |
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36 n = 0; |
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37 |
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38 if (isstr (s) && isstr (t)) |
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39 |
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40 l_s = length (s); |
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41 l_t = length (t); |
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42 |
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43 if (l_t <= l_s) |
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44 tmp = l_s - l_t + 1; |
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45 for idx = 1 : tmp |
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46 if (strcmp (substr (s, idx, l_t), t)) |
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47 n = idx; |
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48 return; |
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49 endif |
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50 endfor |
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51 endif |
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52 |
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53 else |
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54 error ("index: expecting string arguments"); |
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55 endif |
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56 |
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57 endfunction |
