The external buffer to which the packetbuf is to be copied must be able to accomodate at least PACKETBUF_HDR_SIZE bytes. The number of bytes that was copied to the external buffer is returned.

The external buffer to which the packetbuf is to be copied must be able to accomodate at least PACKETBUF_HDR_SIZE bytes. The number of bytes that was copied to the external buffer is returned.

<source lang="c">

<source lang="c">

{

{

   }

   }

#endif /* DEBUG_LEVEL */

#endif /* DEBUG_LEVEL */

   memcpy(to, packetbuf + hdrptr, PACKETBUF_HDR_SIZE - hdrptr);

   memcpy(to, packetbuf + hdrptr, PACKETBUF_HDR_SIZE - hdrptr);//packetbuf points to the beginning of the buffer array.

   return PACKETBUF_HDR_SIZE - hdrptr;

   return PACKETBUF_HDR_SIZE - hdrptr;

}

}

In the above potion of code, the main line is the follwing

In the above potion of code, the main line is the following

  memcpy(to, packetbuf + hdrptr, PACKETBUF_HDR_SIZE - hdrptr);

  memcpy(to, packetbuf + hdrptr, PACKETBUF_HDR_SIZE - hdrptr);