hex.c

* A ncurses user interface. * Network statistics to view the amount of packets and data in many

/*

  This file is part of sniffer, a packet capture utility and
  network moniter
  The author can be contacted at <[e-mail]>
  the lastest version is avilable from 
  http://stev.org

  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 2 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, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "hex.h"

/**********************************************
********* Log Hex *****************************
**********************************************/
/* this will return a pointer to a string */
/* full of the stuff to print it will have a null on the end */
/* do not forget to free the data */
/* will return null if there is an error */
char *hex_conv(char *data, int length) {
	int i;
	int g;
	char *pointer;
	char *buff;
	char *buff_p; /* the pointer to find out where to print to */

	if (length == 0)
		return NULL;

	buff = malloc(length * 80);
	if (!buff)
		return NULL;

	buff_p = buff;

	pointer = data;
	while( pointer < data + length) {
		buff_p += sprintf(buff_p, "\t");
		i = 0;
		while (pointer + i < data + length && i < 15) {
			buff_p += sprintf(buff_p, "%.2x ", pointer[i] & 0xFF );
			i++;
		}
		if (i < 15) /* put spaces until we catch up to the data line */
			for(g=i;g<15;g++)
				buff_p += sprintf(buff_p, "   ");
		buff_p += sprintf(buff_p, "\t");
		i = 0;
		while (pointer + i < data + length && i < 15) {
			if (pointer[i] > 0x20 && pointer[i] < 0x7E) {
				buff_p += sprintf(buff_p, "%c", pointer[i]);
			} else {
				buff_p += sprintf(buff_p, ".");
			}
			i++;
		}
		buff_p += sprintf(buff_p, "\n");
		pointer += 15;
	}
	return buff;
}