csu3_am335x/EVSE/GPL/plc-utils.LNX.2.1.20/source/tools/decdecode.c

/*====================================================================*
 *
 *   size_t decdecode (void const * memory, size_t extent,  char buffer [], size_t length);
 *
 *   memory.h
 *
 *   decode a memory block of given length in bytes as a string of
 *   separated hexadecimal bytes; terminate once the string fills
 *   or the memory ends; terminate the string and return the actual
 *   string bytes;
 *
 *   allow three string characters for each memory byte; this means
 *   that the buffer must have at least three characters or nothing
 *   will be decoded; the maximum number of bytes is the lesser of
 *   chars/3 and bytes;; 
 *
 *   Motley Tools by Charles Maier <cmaier@cmassoc.net>;
 *   Copyright (c) 2001-2006 by Charles Maier Associates;
 *   Licensed under the Internet Software Consortium License;
 *
 *--------------------------------------------------------------------*/

#ifndef DECDECODE_SOURCE
#define DECDECODE_SOURCE

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

size_t decdecode (void const * memory, register size_t extent, char buffer [], register size_t length) 

{ 
	register char * string = (char *) (buffer); 
	register byte * offset = (byte *) (memory); 
	if (length) 
	{ 
		length /= DEC_DIGITS +  1; 
		while ((length--) && (extent--)) 
		{ 
			unsigned octet = * offset; 
			unsigned digit = DEC_DIGITS; 
			while (digit--) 
			{ 
				string [digit] = '0' +  octet % RADIX_DEC; 
				octet /= RADIX_DEC; 
			} 
			string += DEC_DIGITS; 
			if ((length) && (extent)) 
			{ 
				* string++ = DEC_EXTENDER; 
			} 
			offset++; 
		} 
		* string = (char) (0); 
	} 
	return (string - buffer); 
} 

#endif