/*
 * (C) 2002 Guido Serassio <serassio@libero.it>
 * Based on previous work of Francesco Chemolli and Robert Collins
 * Distributed freely under the terms of the GNU General Public License,
 * version 2. See the file COPYING for licensing details
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 */

typedef unsigned char uchar;

#include "util.h"
#include "negotiate.h"
#if HAVE_CTYPE_H
#include <ctype.h>
#endif

void 
hex_dump(void *data, int size)
{
    /* dumps size bytes of *data to stdout. Looks like:
     * [0000] 75 6E 6B 6E 6F 77 6E 20
     *                  30 FF 00 00 00 00 39 00 unknown 0.....9.
     * (in a single line of course)
     */

    if (!data)
	return;

    if (debug_enabled) {
	unsigned char *p = data;
	unsigned char c;
	int n;
	char bytestr[4] =
	{0};
	char addrstr[10] =
	{0};
	char hexstr[16 * 3 + 5] =
	{0};
	char charstr[16 * 1 + 5] =
	{0};
	for (n = 1; n <= size; n++) {
	    if (n % 16 == 1) {
		/* store address for this line */
		snprintf(addrstr, sizeof(addrstr), "%.4x",
		    ((unsigned int) p - (unsigned int) data));
	    }
	    c = *p;
	    if (isalnum(c) == 0) {
		c = '.';
	    }
	    /* store hex str (for left side) */
	    snprintf(bytestr, sizeof(bytestr), "%02X ", *p);
	    strncat(hexstr, bytestr, sizeof(hexstr) - strlen(hexstr) - 1);

	    /* store char str (for right side) */
	    snprintf(bytestr, sizeof(bytestr), "%c", c);
	    strncat(charstr, bytestr, sizeof(charstr) - strlen(charstr) - 1);

	    if (n % 16 == 0) {
		/* line completed */
		fprintf(stderr, "[%4.4s]   %-50.50s  %s\n", addrstr, hexstr, charstr);
		hexstr[0] = 0;
		charstr[0] = 0;
	    } else if (n % 8 == 0) {
		/* half line: add whitespaces */
		strncat(hexstr, "  ", sizeof(hexstr) - strlen(hexstr) - 1);
		strncat(charstr, " ", sizeof(charstr) - strlen(charstr) - 1);
	    }
	    p++;		/* next byte */
	}

	if (strlen(hexstr) > 0) {
	    /* print rest of buffer if not empty */
	    fprintf(stderr, "[%4.4s]   %-50.50s  %s\n", addrstr, hexstr, charstr);
	}
    }
}
