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1772
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1 /* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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2 This file is part of the GNU C Library.
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3
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4 The GNU C Library is free software; you can redistribute it and/or
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5 modify it under the terms of the GNU Library General Public License as
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6 published by the Free Software Foundation; either version 2 of the
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7 License, or (at your option) any later version.
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8
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9 The GNU C Library is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 Library General Public License for more details.
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13
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14 You should have received a copy of the GNU Library General Public
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15 License along with the GNU C Library; see the file COPYING.LIB. If
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16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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17 Cambridge, MA 02139, USA.
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18
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19 This file was modified by Bob Billson, March, 1994 for the OS-9 UUCP package
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20 UUCPbb. */
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21
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22 #ifndef _UCC /* Ultra C already has strstr() */
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23 #include "uucp.h"
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24
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25 /* Return the first ocurrence of NEEDLE in HAYSTACK. */
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26
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27 char *strstr (haystack, needle)
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28 char *haystack, *needle;
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29 {
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30 register char *begin;
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31 char *end_needle = strend (needle);
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32 char *end_haystack = strend (haystack);
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33 int len_needle = end_needle - needle;
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34 int last_needle = len_needle - 1;
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35
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36 if (len_needle == 0)
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37 return ((char *) end_haystack);
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38
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39 if ((end_haystack - haystack) < len_needle)
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40 return (NULL);
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41
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42 for (begin = &haystack[last_needle]; begin < end_haystack; ++begin)
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43 {
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44 char *n = &needle[last_needle];
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45 char *h = begin;
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46
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47 do
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48 if (*h != *n)
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49 goto loop;
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50 while (--n >= needle && --h >= haystack);
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51
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52 return ((char *) h);
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53 loop: ;
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54 }
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55 return (NULL);
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56 }
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57 #endif
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