/*
 *  Copyright (C) 2013 IBM Corporation
 *
 *  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; version 2 of the License.
 *
 *  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  02111-1307  USA
 */

#include <string.h>
#include <assert.h>

#include <util/util.h>
#include <talloc/talloc.h>

static const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
			    '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', };

void mac_str(uint8_t *mac, unsigned int maclen, char *buf, unsigned int buflen)
{
	unsigned int i;
	char *pos;

	assert(buflen > sizeof("unknown"));

	if (!maclen || maclen * 3 + 1 > buflen) {
		strcpy(buf, "unknown");
		return;
	}

	pos = buf;

	for (i = 0; i < maclen; i++) {
		*(pos++) = hex[mac[i] >> 4 & 0xf];
		*(pos++) = hex[mac[i] & 0xf];
		*(pos++) = ':';
	}

	*(pos - 1) = '\0';

	return;
}

char *format_buffer(void *ctx, const uint8_t *buf, unsigned int len)
{
	char *str;
	unsigned int i;

	if (len == 0)
		return "";

	str = talloc_asprintf(ctx, "0x%02x%s", buf[0], len > 1 ? " " : "");
	for (i = 1; i < len; i++)
		str = talloc_asprintf_append(str, "0x%02x%s", buf[i],
			((i + 1) % 8 == 0 && i != len - 1) ? "\n" : " ");

	return str;
}