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diff --git a/imap/src/ansilib/strstr.c b/imap/src/ansilib/strstr.c
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+++ b/imap/src/ansilib/strstr.c
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+/* ========================================================================
+ * Copyright 1988-2006 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 
+ * ========================================================================
+ */
+
+/*
+ * Program:	Substring search
+ *
+ * Author:	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *
+ * Date:	11 May 1989
+ * Last Edited:	30 August 2006
+ */
+
+/* Return pointer to first occurance in string of a substring
+ * Accepts: source pointer
+ *	    substring pointer
+ * Returns: pointer to substring in source or NIL if not found
+ */
+
+char *strstr (char *cs,char *ct)
+{
+  char *s;
+  char *t;
+  while (cs = strchr (cs,*ct)) {/* for each occurance of the first character */
+				/* see if remainder of string matches */
+    for (s = cs + 1, t = ct + 1; *t && *s == *t; s++, t++);
+    if (!*t) return cs;		/* if ran out of substring then have match */
+    cs++;			/* try from next character */
+  }
+  return NIL;			/* not found */
+}