linux-imx

/*

 * Ultra Wide Band

 * Information Element Handling

 *

 * Copyright (C) 2005-2006 Intel Corporation

 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>

 * Reinette Chatre <reinette.chatre@intel.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation.

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA.

 *

 *

 * FIXME: docs

 */

​

#include <linux/slab.h>

#include <linux/export.h>

#include "uwb-internal.h"

​

/**

 * uwb_ie_next - get the next IE in a buffer

 * @ptr: start of the buffer containing the IE data

 * @len: length of the buffer

 *

 * Both @ptr and @len are updated so subsequent calls to uwb_ie_next()

 * will get the next IE.

 *

 * NULL is returned (and @ptr and @len will not be updated) if there

 * are no more IEs in the buffer or the buffer is too short.

 */

struct uwb_ie_hdr *uwb_ie_next(void **ptr, size_t *len)

{

    struct uwb_ie_hdr *hdr;

    size_t ie_len;

​

    if (*len < sizeof(struct uwb_ie_hdr))

        return NULL;

​

    hdr = *ptr;

    ie_len = sizeof(struct uwb_ie_hdr) + hdr->length;

​

    if (*len < ie_len)

        return NULL;

​

    *ptr += ie_len;

    *len -= ie_len;

​

    return hdr;

}

EXPORT_SYMBOL_GPL(uwb_ie_next);

​

/**