1 files changed, 90 insertions, 0 deletions
diff --git a/lib/libc/stdlib/lsearch.c b/lib/libc/stdlib/lsearch.c
new file mode 100644
index 00000000000..ba0aad3cfcb
--- /dev/null
+++ b/lib/libc/stdlib/lsearch.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Roger L. Snyder.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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)
+static char sccsid[] = "@(#)lsearch.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <string.h>
+#include <search.h>
+
+typedef int (*cmp_fn_t)(const void *, const void *);
+static void *linear_base(const void *, const void *, size_t *, size_t,
+    cmp_fn_t, int);
+
+void *
+lsearch(const void *key, const void *base, size_t *nelp, size_t width,
+    	cmp_fn_t compar)
+{
+
+	return(linear_base(key, base, nelp, width, compar, 1));
+}
+
+void *
+lfind(const void *key, const void *base, size_t *nelp, size_t width,
+	cmp_fn_t compar)
+{
+	return(linear_base(key, base, nelp, width, compar, 0));
+}
+
+static void *
+linear_base(const void *key, const void *base, size_t *nelp, size_t width,
+	cmp_fn_t compar, int add_flag)
+{
+	const char *element, *end;
+
+	end = (const char *)base + *nelp * width;
+	for (element = base; element < end; element += width)
+		if (!compar(key, element))		/* key found */
+			return((void *)element);
+
+	if (!add_flag)					/* key not found */
+		return(NULL);
+
+	/*
+	 * The UNIX System User's Manual, 1986 edition claims that
+	 * a NULL pointer is returned by lsearch with errno set
+	 * appropriately, if there is not enough room in the table
+	 * to add a new item.  This can't be done as none of these
+	 * routines have any method of determining the size of the
+	 * table.  This comment isn't in the 1986-87 System V
+	 * manual.
+	 */
+	++*nelp;
+	memcpy((void *)end, key, width);
+	return((void *)end);
+}