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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/* $NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $");
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__RCSID("$NetBSD: strncasecmp.c,v 1.2 2007/06/04 18:19:27 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "file.h"
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#include <assert.h>
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#include <ctype.h>
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#include <string.h>
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static int
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_strncasecmp(const char *s1, const char *s2, size_t n)
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{
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if (n != 0) {
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const unsigned char *us1 = (const unsigned char *)s1,
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*us2 = (const unsigned char *)s2;
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do {
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if (tolower(*us1) != tolower(*us2++))
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return tolower(*us1) - tolower(*--us2);
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if (*us1++ == '\0')
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break;
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} while (--n != 0);
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}
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return 0;
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}
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/*
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* Find the first occurrence of find in s, ignore case.
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*/
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char *
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strcasestr(const char *s, const char *find)
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{
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char c, sc;
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size_t len;
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if ((c = *find++) != 0) {
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c = tolower((unsigned char)c);
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len = strlen(find);
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do {
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do {
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if ((sc = *s++) == 0)
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return (NULL);
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} while ((char)tolower((unsigned char)sc) != c);
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} while (_strncasecmp(s, find, len) != 0);
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s--;
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}
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return (char *)(intptr_t)(s);
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}
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