74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/*
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* This file is part of the Sofia-SIP package
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*
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* Copyright (C) 2005 Nokia Corporation.
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*
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* Contact: Pekka Pessi <pekka.pessi@nokia.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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/**@internal @file strcasestr.c
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* @brief Backup implementation of strcasestr()
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*
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* @author Pekka Pessi <Pekka.Pessi@nokia.com>
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*/
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#include "config.h"
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#include <ctype.h>
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#include <stddef.h>
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/* Naive implementation of strcasestr() */
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char *strcasestr(const char *haystack,
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const char *needle)
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{
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unsigned char lcn, ucn;
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unsigned i;
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if (haystack == NULL || needle == NULL)
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return NULL;
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lcn = ucn = needle[0];
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if (isupper(lcn))
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lcn = tolower(lcn);
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else if (islower(ucn))
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ucn = toupper(ucn);
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if (lcn == 0)
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return (char *)haystack;
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while (haystack[0] != 0) {
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if (lcn == haystack[0] || ucn == haystack[0]) {
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for (i = 1; ; i++) {
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char n = needle[i], h = haystack[i];
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if (n == 0)
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return (char *)haystack;
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if (h == 0)
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return NULL;
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if (isupper(n)) n = tolower(n);
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if (isupper(h)) h = tolower(h);
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if (n != h)
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break;
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}
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}
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haystack++;
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}
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return NULL; /* Not found */
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}
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