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