Function at_recvpkt_get

components/net/at/at_socket/at_socket.c:195–239

get a block from AT socket receive buffer list */

/* get a block from AT socket receive buffer list */
static size_t at_recvpkt_get(rt_slist_t *rlist, char *mem, size_t len)
{
    rt_slist_t *node = RT_NULL;
    rt_slist_t *free_node = RT_NULL;
    at_recv_pkt_t pkt = RT_NULL;
    size_t content_pos = 0, page_pos = 0;

    if (rt_slist_isempty(rlist))
    {
        return 0;
    }

    for (node = rt_slist_first(rlist); node;)
    {
        pkt = rt_slist_entry(node, struct at_recv_pkt, list);

        free_node = node;
        node = rt_slist_next(node);

        if (!pkt) continue;

        page_pos = pkt->bfsz_totle - pkt->bfsz_index;

        if (page_pos >= len - content_pos)
        {
            rt_memcpy((char *) mem + content_pos, pkt->buff + pkt->bfsz_index, len - content_pos);
            pkt->bfsz_index += len - content_pos;
            if (pkt->bfsz_index == pkt->bfsz_totle)
            {
                at_recvpkt_node_delete(rlist, free_node);
            }
            content_pos = len;
            break;
        }
        else
        {
            rt_memcpy((char *) mem + content_pos, pkt->buff + pkt->bfsz_index, page_pos);
            content_pos += page_pos;
            pkt->bfsz_index += page_pos;
            at_recvpkt_node_delete(rlist, free_node);
        }
    }

    return content_pos;
}

static void at_do_event_changes(struct at_socket *sock, at_event_t event, rt_bool_t is_plus)
{