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			todigit.c
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<pre>
/*====================================================================*
 *
 *   unsigned todigit (unsigned c);
 *
 *   number.h
 *
 *   return the unsigned integer equivalent of an ASCII digit or the
 *   value UCHAR_MAX on error;
 *
 *   Motley Tools by Charles Maier &lt;cmaier@cmassoc.net&gt;;
 *   Copyright (c) 2001-2006 by Charles Maier Associates;
 *   Licensed under the Internet Software Consortium License;
 *
 *--------------------------------------------------------------------*/

#ifndef TODIGIT_SOURCE
#define TODIGIT_SOURCE

#include &lt;limits.h&gt;

#include &quot;../tools/number.h&quot;

unsigned todigit (unsigned c)

{
	if ((c &gt;= '0') &amp;&amp; (c &lt;= '9'))
	{
		return (c - '0');
	}
	if ((c &gt;= 'A') &amp;&amp; (c &lt;= 'Z'))
	{
		return (c - 'A' + 10);
	}
	if ((c &gt;= 'a') &amp;&amp; (c &lt;= 'z'))
	{
		return (c - 'a' + 10);
	}
	return (UCHAR_MAX);
}

#endif


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