Create a branch for header work.

svn path=/branches/header-work/; revision=45691

lib/sdk/crt/mbstring/mbstrlen.c

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+/*
+ * COPYRIGHT:   See COPYING in the top level directory
+ * PROJECT:     ReactOS system libraries
+ * FILE:        lib/sdk/crt/mbstring/mbstrlen.c
+ * PURPOSE:      Determines the length of a multi byte string, current locale
+ * PROGRAMERS:
+ *              Copyright 1999 Alexandre Julliard
+ *              Copyright 2000 Jon Griffths
+ *
+ */
+
+#include <mbstring.h>
+#include <stdlib.h>
+
+int isleadbyte(int byte);
+
+/*
+ * @implemented
+ */
+size_t _mbstrlen( const char *str )
+{
+  size_t len = 0;
+  while(*str)
+  {
+    /* FIXME: According to the documentation we are supposed to test for
+     * multi-byte character validity. Whatever that means
+     */
+    str += isleadbyte(*str) ? 2 : 1;
+    len++;
+  }
+  return len;
+}