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diff --git a/libtecla-1.6.3/ioutil.h b/libtecla-1.6.3/ioutil.h
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+++ b/libtecla-1.6.3/ioutil.h
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+#ifndef ioutil_h
+#define ioutil_h
+
+/*
+ * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2012 by Martin C. Shepherd.
+ * 
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, and/or sell copies of the Software, and to permit persons
+ * to whom the Software is furnished to do so, provided that the above
+ * copyright notice(s) and this permission notice appear in all copies of
+ * the Software and that both the above copyright notice(s) and this
+ * permission notice appear in supporting documentation.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+ * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
+ * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * Except as contained in this notice, the name of a copyright holder
+ * shall not be used in advertising or otherwise to promote the sale, use
+ * or other dealings in this Software without prior written authorization
+ * of the copyright holder.
+ */
+
+/*.......................................................................
+ * Callback functions of the following type can be registered to write
+ * to a terminal, when the default blocking writes to a local terminal
+ * aren't appropriate. In particular, if you don't want gl_get_line()
+ * to block, then this function should return before writing the
+ * specified number of characters if doing otherwise would involve
+ * waiting.
+ *
+ * Input:
+ *  data     void *  The anonymous data pointer that was registered with
+ *                   this callback function.
+ *  s  const char *  The string to be written. Beware that this string
+ *                   may not have a terminating '\0' character.
+ *  n         int    The length of the prefix of s[] to attempt to
+ *                   write.
+ * Output:
+ *  return    int    The number of characters written from s[]. This
+ *                   should normally be a number in the range 0 to n.
+ *                   To signal that an I/O error occurred, return -1.
+ */
+#define GL_WRITE_FN(fn) int (fn)(void *data, const char *s, int n)
+typedef GL_WRITE_FN(GlWriteFn);
+
+/*
+ * The following output callback function requires a (FILE *) callback
+ * data argument, and writes to this stream using the fwrite stdio
+ * function.
+ */
+GL_WRITE_FN(_io_write_stdio);
+
+/*
+ * Left justify text within the bounds of the terminal adding optional
+ * indentation, prefixes and suffixes to each line if requested.
+ */
+int _io_display_text(GlWriteFn *write_fn, void *data, int indentation,
+		     const char *prefix, const char *suffix, int fill_char,
+		     int term_width, int start, const char *string);
+
+#endif