Function http_read

cups/http.c:4163–4253

 */

static ssize_t				/* O - Number of bytes read or -1 on error */
http_read(http_t *http,			/* I - HTTP connection */
          char   *buffer,		/* I - Buffer */
          size_t length,		/* I - Maximum bytes to read */
          int    timeout)		/* I - Wait timeout */
{
  ssize_t	bytes;			/* Bytes read */


  DEBUG_printf(("7http_read(http=%p, buffer=%p, length=" CUPS_LLFMT ")", (void *)http, (void *)buffer, CUPS_LLCAST length));

  if (!http->blocking || http->timeout_value > 0.0)
  {
    while (!_httpWait(http, timeout, 1))
    {
      if (http->timeout_cb && (*http->timeout_cb)(http, http->timeout_data))
	continue;

      DEBUG_puts("8http_read: Timeout.");
      return (0);
    }
  }

  DEBUG_printf(("8http_read: Reading %d bytes into buffer.", (int)length));

  do
  {
#ifdef HAVE_TLS
    if (http->tls)
      bytes = _httpTLSRead(http, buffer, (int)length);
    else
#endif /* HAVE_TLS */
    bytes = recv(http->fd, buffer, length, 0);

    if (bytes < 0)
    {
#ifdef _WIN32
      if (WSAGetLastError() != WSAEINTR)
      {
	http->error = WSAGetLastError();
	return (-1);
      }
      else if (WSAGetLastError() == WSAEWOULDBLOCK)
      {
	if (!http->timeout_cb ||
	    !(*http->timeout_cb)(http, http->timeout_data))
	{
	  http->error = WSAEWOULDBLOCK;
	  return (-1);
	}
      }
#else
      DEBUG_printf(("8http_read: %s", strerror(errno)));

      if (errno == EWOULDBLOCK || errno == EAGAIN)
      {
	if (http->timeout_cb && !(*http->timeout_cb)(http, http->timeout_data))
	{