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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);
+}