    /*====================================================================*
     *
     *   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 <cmaier@cmassoc.net>;
     *   Copyright (c) 2001-2006 by Charles Maier Associates;
     *   Licensed under the Internet Software Consortium License;
     *
     *--------------------------------------------------------------------*/

    #ifndef BYTESPEC_SOURCE
    #define BYTESPEC_SOURCE

    #include <ctype.h>
    #include <errno.h>

    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/error.h"

    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, "bytespec");
    	}
    	while (isspace (*number))
    	{
    		number++;
    	}
    	while ((*number) && (extent))
    	{
    		unsigned digit;
    		if ((offset > origin) && (*number == HEX_EXTENDER))
    		{
    			number++;
    		}
    		if ((digit = todigit (*number++)) >= RADIX_HEX)
    		{
    			error (1, EINVAL, "You said '%s' but I want a hex digit", string);
    		}
    		*offset = digit << 4;
    		if ((digit = todigit (*number++)) >= RADIX_HEX)
    		{
    			error (1, EINVAL, "You said '%s' but I want a hex digit", string);
    		}
    		*offset |= digit;
    		offset++;
    		extent--;
    	}
    	while (isspace (*number))
    	{
    		number++;
    	}
    	if ((*number) || (extent))
    	{
    		error (1, EINVAL, "%s is not %d bytes", string, (unsigned)(offset - origin + extent));
    	}
    	return (offset - origin);
    }

    #endif

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