a752c7ab
 elopes
add first test an...
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/*
* Copyright (C) 2017 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @author Martine Lenders <m.lenders@fu-berlin.de>
*/
#include <sys/uio.h>
#include "net/gnrc/pktbuf.h"
gnrc_pktsnip_t *gnrc_pktbuf_get_iovec(gnrc_pktsnip_t *pkt, size_t *len)
{
size_t length;
gnrc_pktsnip_t *head;
struct iovec *vec;
assert(len != NULL);
if (pkt == NULL) {
*len = 0;
return NULL;
}
/* count the number of snips in the packet and allocate the IOVEC */
length = gnrc_pkt_count(pkt);
head = gnrc_pktbuf_add(pkt, NULL, (length * sizeof(struct iovec)),
GNRC_NETTYPE_IOVEC);
if (head == NULL) {
*len = 0;
return NULL;
}
assert(head->data != NULL);
vec = (struct iovec *)(head->data);
/* fill the IOVEC */
while (pkt != NULL) {
vec->iov_base = pkt->data;
vec->iov_len = pkt->size;
++vec;
pkt = pkt->next;
}
*len = length;
return head;
}
gnrc_pktsnip_t *gnrc_pktbuf_remove_snip(gnrc_pktsnip_t *pkt,
gnrc_pktsnip_t *snip)
{
LL_DELETE(pkt, snip);
snip->next = NULL;
gnrc_pktbuf_release(snip);
return pkt;
}
gnrc_pktsnip_t *gnrc_pktbuf_replace_snip(gnrc_pktsnip_t *pkt,
gnrc_pktsnip_t *old,
gnrc_pktsnip_t *add)
{
/* If add is a list we need to preserve its tail */
if (add->next != NULL) {
gnrc_pktsnip_t *tail = add->next;
gnrc_pktsnip_t *back;
LL_SEARCH_SCALAR(tail, back, next, NULL); /* find the last snip in add */
/* Replace old */
LL_REPLACE_ELEM(pkt, old, add);
/* and wire in the tail between */
back->next = add->next;
add->next = tail;
}
else {
/* add is a single element, has no tail, simply replace */
LL_REPLACE_ELEM(pkt, old, add);
}
old->next = NULL;
gnrc_pktbuf_release(old);
return pkt;
}
/** @} */
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