Function http_write

cups/http.c:4740–4877

 */

static ssize_t				/* O - Number of bytes written */
http_write(http_t     *http,		/* I - HTTP connection */
           const char *buffer,		/* I - Buffer for data */
	   size_t     length)		/* I - Number of bytes to write */
{
  ssize_t	tbytes,			/* Total bytes sent */
		bytes;			/* Bytes sent */


  DEBUG_printf(("7http_write(http=%p, buffer=%p, length=" CUPS_LLFMT ")", (void *)http, (void *)buffer, CUPS_LLCAST length));
  http->error = 0;
  tbytes      = 0;

  while (length > 0)
  {
    DEBUG_printf(("8http_write: About to write %d bytes.", (int)length));

    if (http->timeout_value > 0.0)
    {
#ifdef HAVE_POLL
      struct pollfd	pfd;		/* Polled file descriptor */
#else
      fd_set		output_set;	/* Output ready for write? */
      struct timeval	timeout;	/* Timeout value */
#endif /* HAVE_POLL */
      int		nfds;		/* Result from select()/poll() */

      do
      {
#ifdef HAVE_POLL
	pfd.fd     = http->fd;
	pfd.events = POLLOUT;

	while ((nfds = poll(&pfd, 1, http->wait_value)) < 0 &&
	       (errno == EINTR || errno == EAGAIN))
	  /* do nothing */;

#else
	do
	{
	  FD_ZERO(&output_set);
	  FD_SET(http->fd, &output_set);

	  timeout.tv_sec  = http->wait_value / 1000;
	  timeout.tv_usec = 1000 * (http->wait_value % 1000);

	  nfds = select(http->fd + 1, NULL, &output_set, NULL, &timeout);
	}
#  ifdef _WIN32
	while (nfds < 0 && (WSAGetLastError() == WSAEINTR ||
			    WSAGetLastError() == WSAEWOULDBLOCK));
#  else
	while (nfds < 0 && (errno == EINTR || errno == EAGAIN));
#  endif /* _WIN32 */
#endif /* HAVE_POLL */

        if (nfds < 0)
	{