Function pbuf_free_header

components/net/lwip/lwip-2.1.2/src/core/pbuf.c:670–688

Similar to pbuf_header(-size) but de-refs header pbufs for (size >= p->len) * * @param q pbufs to operate on * @param size The number of bytes to remove from the beginning of the pbuf list. * While size >= p->len, pbufs are freed. * ATTENTION: this is the opposite direction as @ref pbuf_header, but * takes an u16_t not s16_t! * @return the new head pbuf

 * @return the new head pbuf
 */
struct pbuf *
pbuf_free_header(struct pbuf *q, u16_t size)
{
  struct pbuf *p = q;
  u16_t free_left = size;
  while (free_left && p) {
    if (free_left >= p->len) {
      struct pbuf *f = p;
      free_left = (u16_t)(free_left - p->len);
      p = p->next;
      f->next = 0;
      pbuf_free(f);
    } else {
      pbuf_remove_header(p, free_left);
      free_left = 0;
    }
  }
  return p;
}

/**
 * @ingroup pbuf