Function auto_configure

filter/commandtops.c:123–405

 */

static int				/* O - Exit status */
auto_configure(ppd_file_t *ppd,		/* I - PPD file */
               const char *user)	/* I - Printing user */
{
  int		status = 0;		/* Exit status */
  ppd_option_t	*option;		/* Current option in PPD */
  ppd_attr_t	*attr;			/* Query command attribute */
  const char	*valptr;		/* Pointer into attribute value */
  char		buffer[1024],		/* String buffer */
		*bufptr;		/* Pointer into buffer */
  ssize_t	bytes;			/* Number of bytes read */
  int		datalen;		/* Side-channel data length */


 /*
  * See if the backend supports bidirectional I/O...
  */

  datalen = 1;
  if (cupsSideChannelDoRequest(CUPS_SC_CMD_GET_BIDI, buffer, &datalen,
                               30.0) != CUPS_SC_STATUS_OK ||
      buffer[0] != CUPS_SC_BIDI_SUPPORTED)
  {
    fputs("DEBUG: Unable to auto-configure PostScript Printer - no "
          "bidirectional I/O available!\n", stderr);
    return (1);
  }

 /*
  * Put the printer in PostScript mode...
  */

  begin_ps(ppd, user);

 /*
  * (STR #4028)
  *
  * As a lot of PPDs contain bad PostScript query code, we need to prevent one
  * bad query sequence from affecting all auto-configuration.  The following
  * error handler allows us to log PostScript errors to cupsd.
  */

  puts("/cups_handleerror {\n"
       "  $error /newerror false put\n"
       "  (:PostScript error in \") print cups_query_keyword print (\": ) "
       "print\n"
       "  $error /errorname get 128 string cvs print\n"
       "  (; offending command:) print $error /command get 128 string cvs "
       "print (\n) print flush\n"
       "} bind def\n"
       "errordict /timeout {} put\n"
       "/cups_query_keyword (?Unknown) def\n");
  fflush(stdout);

 /*
  * Wait for the printer to become connected...
  */