text: /*
   * hexdump implementation without depenecies to *printf()
   * output is equal to 'hexdump -C'
   * should be compatible to 64bit architectures
   *
   * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #define hex_print(p) printf("%s\n", ((char *)p));
  
  static char nibble[] = {
  	'0', '1', '2', '3', '4', '5', '6', '7',
  	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
  
  #define BYTES_PER_LINE 0x10
  
  void hexdump(const uint8_t *p, unsigned int len)
  {
  	unsigned int i, addr;
  	unsigned int wordlen = sizeof(void*);
  	unsigned char v, line[BYTES_PER_LINE * 5];
  
  	for (addr = 0; addr < len; addr += BYTES_PER_LINE) {
  		/* clear line */
  		for (i = 0; i < sizeof(line); i++) {
  			if (i == wordlen * 2 + 52 ||
  			    i == wordlen * 2 + 69) {
  			    	line[i] = '|';
  				continue;
  			}
  
  			if (i == wordlen * 2 + 70) {
  				line[i] = '\0';
  				continue;
  			}
  
  			line[i] = ' ';
  		}
  
  		/* print address */
  		for (i = 0; i < wordlen * 2; i++) {
  			v = addr >> ((wordlen * 2 - i - 1) * 4);
  			line[i] = nibble[v & 0xf];
  		}
  
  		/* dump content */
  		for (i = 0; i < BYTES_PER_LINE; i++) {
  			int pos = (wordlen * 2) + 3 + (i / 8);
  
  			if (addr + i >= len)
  				break;
  
  			v = p[addr + i];
  			line[pos + (i * 3) + 0] = nibble[v >> 4];
  			line[pos + (i * 3) + 1] = nibble[v & 0xf];
  
  			/* character printable? */
  			line[(wordlen * 2) + 53 + i] =
  				(v >= ' ' && v <= '~') ? v : '.';
  		}
  
  		hex_print(line);
  	}
  }
  