1 files changed, 37 insertions, 0 deletions
diff --git a/410kern/string/strstr.c b/410kern/string/strstr.c
new file mode 100644
index 0000000..7c2fb55
--- /dev/null
+++ b/410kern/string/strstr.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).  All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+char *strstr(const char *haystack, const char *needle)
+{
+	int hlen = strlen(haystack);
+	int nlen = strlen(needle);
+
+	while (hlen >= nlen)
+	{
+		if (!memcmp(haystack, needle, nlen))
+			return (void*)haystack;
+
+		haystack++;
+		hlen--;
+	}
+	return 0;
+}
+