Function write_buffer

common/sphinx.c:173–177

Small helper to append data to a buffer and update the position * into the buffer */

 * into the buffer
 */
static void write_buffer(u8 *dst, const void *src, const size_t len, int *pos)
{
	memcpy(dst + *pos, src, len);
	*pos += len;
}

u8 *serialize_onionpacket(
	const tal_t *ctx,