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diff --git a/nuttx/lib/lib_isbasedigit.c b/nuttx/lib/lib_isbasedigit.c
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+++ b/nuttx/lib/lib_isbasedigit.c
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+/****************************************************************************
+ * lib/lib_isbasedigit.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+#include <ctype.h>
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_isbasedigit
+ *
+ * Description:
+ *   Given an ASCII character, ch, and a base (1-36) do two
+ *   things:  1) Determine if ch is a valid charcter, and 2)
+ *   convert ch to its binary value.
+ *
+ ****************************************************************************/
+
+boolean lib_isbasedigit(int ch, int base, int *value)
+{
+  boolean ret = FALSE;
+  int    tmp = 0;
+
+  if (base <= 10)
+    {
+      if (ch >= '0' && ch <= base + '0' - 1)
+        {
+          tmp = ch - '0';
+          ret = TRUE;
+        }
+    }
+  else if (base <= 36)
+    {
+      if (ch >= '0' && ch <= '9')
+        {
+          tmp = ch - '0';
+          ret =TRUE;
+        }
+      else if (ch >= 'a' && ch <= 'a' + base - 11)
+        {
+          tmp = ch - 'a' + 10;
+          ret = TRUE;
+        }
+      else if (ch >= 'A' && ch <= 'A' + base - 11)
+        {
+          tmp = ch - 'A' + 10;
+          ret = TRUE;
+        }
+    }
+
+  if (value)
+    {
+      *value = tmp;
+    }
+  return ret;
+}
+
+