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			bytespec.c
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<pre>
/*====================================================================*
 *
 *   size_t bytespec (char const *string,  void * memory, size_t extent);
 *
 *   memory.h
 *
 *   encode a memory region with a fixed-length hexadecimal string;
 *   return the number of bytes encoded or terminate the program on
 *   error;
 *
 *   the number of octets in string must equal the memory extent or
 *   an error will occur; octets may be seperated by colons; empty
 *   octets are illegal;
 *
 *   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 BYTESPEC_SOURCE
#define BYTESPEC_SOURCE

#include &lt;ctype.h&gt;
#include &lt;errno.h&gt;

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

size_t bytespec (char const * string, void * memory, size_t extent)

{
	char const * number = string;
	byte * origin = (byte *)(memory);
	byte * offset = (byte *)(memory);
	if (!number)
	{
		error (1, EINVAL, &quot;bytespec&quot;);
	}
	while (isspace (*number))
	{
		number++;
	}
	while ((*number) &amp;&amp; (extent))
	{
		unsigned digit;
		if ((offset &gt; origin) &amp;&amp; (*number == HEX_EXTENDER))
		{
			number++;
		}
		if ((digit = todigit (*number++)) &gt;= RADIX_HEX)
		{
			error (1, EINVAL, &quot;You said '%s' but I want a hex digit&quot;, string);
		}
		*offset = digit &lt;&lt; 4;
		if ((digit = todigit (*number++)) &gt;= RADIX_HEX)
		{
			error (1, EINVAL, &quot;You said '%s' but I want a hex digit&quot;, string);
		}
		*offset |= digit;
		offset++;
		extent--;
	}
	while (isspace (*number))
	{
		number++;
	}
	if ((*number) || (extent))
	{
		error (1, EINVAL, &quot;%s is not %d bytes&quot;, string, (unsigned)(offset - origin + extent));
	}
	return (offset - origin);
}

#endif


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