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diff --git a/nuttx/libc/string/lib_strtokr.c b/nuttx/libc/string/lib_strtokr.c
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+++ b/nuttx/libc/string/lib_strtokr.c
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+/****************************************************************************
+ * libc/string/lib_strtokr.c
+ *
+ *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <string.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: strtok_r
+ *
+ * Description:
+ *   The strtok_r() function is a reentrant version strtok().
+ *   Like strtok(), it  parses  a string into a sequence of
+ *   tokens.  On the first call to strtok() the string to be
+ *   parsed should be specified in 'str'.  In each subsequent
+ *   call that should parse the same string, 'str' should be
+ *   NULL.
+ *
+ *   The 'saveptr' argument is a pointer to a char *
+ *   variable  that  is  used internally by strtok_r() in
+ *   order to maintain context between successive calls
+ *   that parse the same string.
+ *
+ *   On the first call to strtok_r(), 'str' should point to the
+ *   string to be parsed, and the value of 'saveptr' is 
+ *   ignored.  In subsequent calls, 'str' should be NULL, and
+ *   saveptr should be unchanged since the previous call.
+ *
+ *   The 'delim' argument specifies a set of characters that
+ *   delimit the tokens in the parsed string.  The caller
+ *   may specify different strings in delim in successive
+ *   calls that parse the same string.
+ *
+ *   Each call to strtok_r() returns a pointer to a null-
+ *   terminated string containing the next token. This
+ *   string  does not include the delimiting character.  If
+ *   no more tokens are found, strtok_r() returns NULL.
+ *
+ *   A sequence of two or more contiguous delimiter
+ *   characters in the parsed string is considered to be a
+ *   single delimiter. Delimiter characters at the start or
+ *   end of the string are ignored.  The tokens returned by
+ *   strtok() are always non-empty strings.
+ *
+ * Return
+ *    strtok_r() returns a pointer to the next token, or NULL
+ *    if there are no more tokens.
+ *
+ ****************************************************************************/
+
+FAR char *strtok_r(FAR char *str, FAR const char *delim, FAR char **saveptr)
+{
+  char *pbegin;
+  char *pend = NULL;
+
+  /* Decide if we are starting a new string or continuing from
+   * the point we left off.
+   */
+
+  if (str)
+    {
+      pbegin = str;
+    }
+  else if (saveptr && *saveptr)
+    {
+      pbegin = *saveptr;
+    }
+  else
+    {
+      return NULL;
+    }
+
+  /* Find the beginning of the next token */
+
+  for (;
+       *pbegin && strchr(delim, *pbegin) != NULL;
+       pbegin++);
+
+  /* If we are at the end of the string with nothing
+   * but delimiters found, then return NULL.
+   */
+
+  if (!*pbegin)
+    {
+      return NULL;
+    }
+
+  /* Find the end of the token */
+
+  for (pend = pbegin + 1;
+       *pend && strchr(delim, *pend) == NULL;
+       pend++);
+
+
+  /* pend either points to the end of the string or to
+   * the first delimiter after the string.
+   */
+
+  if (*pend)
+    {
+      /* Turn the delimiter into a null terminator */
+
+      *pend++ = '\0';
+    }
+
+  /* Save the pointer where we left off and return the
+   * beginning of the token.
+   */
+
+  if (saveptr)
+    {
+      *saveptr = pend;
+    }
+  return pbegin;
+}