Function lpd_command

backend/lpd.c:633–688

 */

static int			/* O - Status of command */
lpd_command(int  fd,		/* I - Socket connection to LPD host */
            char *format,	/* I - printf()-style format string */
            ...)		/* I - Additional args as necessary */
{
  va_list	ap;		/* Argument pointer */
  char		buf[1024];	/* Output buffer */
  ssize_t	bytes;		/* Number of bytes to output */
  char		status;		/* Status from command */


 /*
  * Don't try to send commands if the job has been canceled...
  */

  if (abort_job)
    return (-1);

 /*
  * Format the string...
  */

  va_start(ap, format);
  bytes = vsnprintf(buf, sizeof(buf), format, ap);
  va_end(ap);

  fprintf(stderr, "DEBUG: lpd_command %2.2x %s", buf[0], buf + 1);

 /*
  * Send the command...
  */

  fprintf(stderr, "DEBUG: Sending command string (" CUPS_LLFMT " bytes)...\n", CUPS_LLCAST bytes);

  if (lpd_write(fd, buf, (size_t)bytes) < bytes)
  {
    perror("DEBUG: Unable to send LPD command");
    return (-1);
  }

 /*
  * Read back the status from the command and return it...
  */

  fputs("DEBUG: Reading command status...\n", stderr);

  if (recv(fd, &status, 1, 0) < 1)
  {
    _cupsLangPrintFilter(stderr, "WARNING", _("The printer did not respond."));
    status = (char)errno;
  }

  fprintf(stderr, "DEBUG: lpd_command returning %d\n", status);

  return (status);
}