rltty.c

在非GUI环境下

  while (1)
    {
      ioctl_ret = GETATTR (tty, tiop);
      if (ioctl_ret < 0)
	{
	  if (errno != EINTR)
	    return -1;
	  else
	    continue;
	}
      if (OUTPUT_BEING_FLUSHED (tiop))
	{
#if defined (FLUSHO) && defined (_AIX41)
	  rltty_warning ("turning off output flushing");
	  tiop->c_lflag &= ~FLUSHO;
	  break;
#else
	  continue;
#endif
	}
      break;
    }

  return 0;
}

static int
get_tty_settings (tty, tiop)
     int tty;
     TIOTYPE *tiop;
{
  set_winsize (tty);

  if (_get_tty_settings (tty, tiop) < 0)
    return -1;

#if defined (_AIX)
  setopost(tiop);
#endif

  return 0;
}

static int
_set_tty_settings (tty, tiop)
     int tty;
     TIOTYPE *tiop;
{
  while (SETATTR (tty, tiop) < 0)
    {
      if (errno != EINTR)
	return -1;
      errno = 0;
    }
  return 0;
}

static int
set_tty_settings (tty, tiop)
     int tty;
     TIOTYPE *tiop;
{
  if (_set_tty_settings (tty, tiop) < 0)
    return -1;
    
#if 0

#if defined (TERMIOS_TTY_DRIVER)
#  if defined (__ksr1__)
  if (ksrflow)
    {
      ksrflow = 0;
      tcflow (tty, TCOON);
    }
#  else /* !ksr1 */
  tcflow (tty, TCOON);		/* Simulate a ^Q. */
#  endif /* !ksr1 */
#else
  ioctl (tty, TCXONC, 1);	/* Simulate a ^Q. */
#endif /* !TERMIOS_TTY_DRIVER */

#endif /* 0 */

  return 0;
}

static void
prepare_terminal_settings (meta_flag, oldtio, tiop)
     int meta_flag;
     TIOTYPE oldtio, *tiop;
{
  readline_echoing_p = (oldtio.c_lflag & ECHO);

  tiop->c_lflag &= ~(ICANON | ECHO);

  if ((unsigned char) oldtio.c_cc[VEOF] != (unsigned char) _POSIX_VDISABLE)
    _rl_eof_char = oldtio.c_cc[VEOF];

#if defined (USE_XON_XOFF)
#if defined (IXANY)
  tiop->c_iflag &= ~(IXON | IXOFF | IXANY);
#else
  /* `strict' Posix systems do not define IXANY. */
  tiop->c_iflag &= ~(IXON | IXOFF);
#endif /* IXANY */
#endif /* USE_XON_XOFF */

  /* Only turn this off if we are using all 8 bits. */
  if (((tiop->c_cflag & CSIZE) == CS8) || meta_flag)
    tiop->c_iflag &= ~(ISTRIP | INPCK);

  /* Make sure we differentiate between CR and NL on input. */
  tiop->c_iflag &= ~(ICRNL | INLCR);

#if !defined (HANDLE_SIGNALS)
  tiop->c_lflag &= ~ISIG;
#else
  tiop->c_lflag |= ISIG;
#endif

  tiop->c_cc[VMIN] = 1;
  tiop->c_cc[VTIME] = 0;

#if defined (FLUSHO)
  if (OUTPUT_BEING_FLUSHED (tiop))
    {
      tiop->c_lflag &= ~FLUSHO;
      oldtio.c_lflag &= ~FLUSHO;
    }
#endif

  /* Turn off characters that we need on Posix systems with job control,
     just to be sure.  This includes ^Y and ^V.  This should not really
     be necessary.  */
#if defined (TERMIOS_TTY_DRIVER) && defined (_POSIX_VDISABLE)

#if defined (VLNEXT)
  tiop->c_cc[VLNEXT] = _POSIX_VDISABLE;
#endif

#if defined (VDSUSP)
  tiop->c_cc[VDSUSP] = _POSIX_VDISABLE;
#endif

#endif /* TERMIOS_TTY_DRIVER && _POSIX_VDISABLE */
}
#endif  /* NEW_TTY_DRIVER */

/* Put the terminal in CBREAK mode so that we can detect key presses. */
void
rl_prep_terminal (meta_flag)
     int meta_flag;
{
  int tty;
  TIOTYPE tio;

  if (terminal_prepped)
    return;

  /* Try to keep this function from being INTerrupted. */
  block_sigint ();

  tty = fileno (rl_instream);

  if (get_tty_settings (tty, &tio) < 0)
    {
      release_sigint ();
      return;
    }

  otio = tio;

  rl_tty_unset_default_bindings (_rl_keymap);
  save_tty_chars (&otio);
  RL_SETSTATE(RL_STATE_TTYCSAVED);
  _rl_bind_tty_special_chars (_rl_keymap, tio);

  prepare_terminal_settings (meta_flag, otio, &tio);

  if (set_tty_settings (tty, &tio) < 0)
    {
      release_sigint ();
      return;
    }

  if (_rl_enable_keypad)
    _rl_control_keypad (1);

  fflush (rl_outstream);
  terminal_prepped = 1;
  RL_SETSTATE(RL_STATE_TERMPREPPED);

  release_sigint ();
}

/* Restore the terminal's normal settings and modes. */
void
rl_deprep_terminal ()
{
  int tty;

  if (!terminal_prepped)
    return;

  /* Try to keep this function from being interrupted. */
  block_sigint ();

  tty = fileno (rl_instream);

  if (_rl_enable_keypad)
    _rl_control_keypad (0);

  fflush (rl_outstream);

  if (set_tty_settings (tty, &otio) < 0)
    {
      release_sigint ();
      return;
    }

  terminal_prepped = 0;
  RL_UNSETSTATE(RL_STATE_TERMPREPPED);

  release_sigint ();
}

/* **************************************************************** */
/*								    */
/*			Bogus Flow Control      		    */
/*								    */
/* **************************************************************** */

int
rl_restart_output (count, key)
     int count, key;
{
  int fildes = fileno (rl_outstream);
#if defined (TIOCSTART)
#if defined (apollo)
  ioctl (&fildes, TIOCSTART, 0);
#else
  ioctl (fildes, TIOCSTART, 0);
#endif /* apollo */

#else /* !TIOCSTART */
#  if defined (TERMIOS_TTY_DRIVER)
#    if defined (__ksr1__)
  if (ksrflow)
    {
      ksrflow = 0;
      tcflow (fildes, TCOON);
    }
#    else /* !ksr1 */
  tcflow (fildes, TCOON);		/* Simulate a ^Q. */
#    endif /* !ksr1 */
#  else /* !TERMIOS_TTY_DRIVER */
#    if defined (TCXONC)
  ioctl (fildes, TCXONC, TCOON);
#    endif /* TCXONC */
#  endif /* !TERMIOS_TTY_DRIVER */
#endif /* !TIOCSTART */

  return 0;
}

int
rl_stop_output (count, key)
     int count, key;
{
  int fildes = fileno (rl_instream);

#if defined (TIOCSTOP)
# if defined (apollo)
  ioctl (&fildes, TIOCSTOP, 0);
# else
  ioctl (fildes, TIOCSTOP, 0);
# endif /* apollo */
#else /* !TIOCSTOP */
# if defined (TERMIOS_TTY_DRIVER)
#  if defined (__ksr1__)
  ksrflow = 1;
#  endif /* ksr1 */
  tcflow (fildes, TCOOFF);
# else
#   if defined (TCXONC)
  ioctl (fildes, TCXONC, TCOON);
#   endif /* TCXONC */
# endif /* !TERMIOS_TTY_DRIVER */
#endif /* !TIOCSTOP */

  return 0;
}

/* **************************************************************** */
/*								    */
/*			Default Key Bindings			    */
/*								    */
/* **************************************************************** */

#define SET_SPECIAL(sc, func)	set_special_char(kmap, &ttybuff, sc, func)

#if defined (NEW_TTY_DRIVER)
static void
set_special_char (kmap, tiop, sc, func)
     Keymap kmap;
     TIOTYPE *tiop;
     int sc;
     rl_command_func_t *func;
{
  if (sc != -1 && kmap[(unsigned char)sc].type == ISFUNC)
    kmap[(unsigned char)sc].function = func;
}

#define RESET_SPECIAL(c) \
  if (c != -1 && kmap[(unsigned char)c].type == ISFUNC)
    kmap[(unsigned char)c].function = rl_insert;

static void
_rl_bind_tty_special_chars (kmap, ttybuff)
     Keymap kmap;
     TIOTYPE ttybuff;
{
  if (ttybuff.flags & SGTTY_SET)
    {
      SET_SPECIAL (ttybuff.sgttyb.sg_erase, rl_rubout);
      SET_SPECIAL (ttybuff.sgttyb.sg_kill, rl_unix_line_discard);
    }

#  if defined (TIOCGLTC)
  if (ttybuff.flags & LTCHARS_SET)
    {
      SET_SPECIAL (ttybuff.ltchars.t_werasc, rl_unix_word_rubout);
      SET_SPECIAL (ttybuff.ltchars.t_lnextc, rl_quoted_insert);
    }
#  endif /* TIOCGLTC */
}

#else /* !NEW_TTY_DRIVER */
static void
set_special_char (kmap, tiop, sc, func)
     Keymap kmap;
     TIOTYPE *tiop;
     int sc;
     rl_command_func_t *func;
{
  unsigned char uc;

  uc = tiop->c_cc[sc];
  if (uc != (unsigned char)_POSIX_VDISABLE && kmap[uc].type == ISFUNC)
    kmap[uc].function = func;
}

/* used later */
#define RESET_SPECIAL(uc) \
  if (uc != (unsigned char)_POSIX_VDISABLE && kmap[uc].type == ISFUNC) \
    kmap[uc].function = rl_insert;

static void
_rl_bind_tty_special_chars (kmap, ttybuff)
     Keymap kmap;
     TIOTYPE ttybuff;
{
  SET_SPECIAL (VERASE, rl_rubout);
  SET_SPECIAL (VKILL, rl_unix_line_discard);

#  if defined (VLNEXT) && defined (TERMIOS_TTY_DRIVER)
  SET_SPECIAL (VLNEXT, rl_quoted_insert);
#  endif /* VLNEXT && TERMIOS_TTY_DRIVER */

#  if defined (VWERASE) && defined (TERMIOS_TTY_DRIVER)
  SET_SPECIAL (VWERASE, rl_unix_word_rubout);
#  endif /* VWERASE && TERMIOS_TTY_DRIVER */
}

#endif /* !NEW_TTY_DRIVER */

/* Set the system's default editing characters to their readline equivalents
   in KMAP.  Should be static, now that we have rl_tty_set_default_bindings. */
void
rltty_set_default_bindings (kmap)
     Keymap kmap;
{
  TIOTYPE ttybuff;
  int tty;
  static int called = 0;

  tty = fileno (rl_instream);

  if (get_tty_settings (tty, &ttybuff) == 0)
    _rl_bind_tty_special_chars (kmap, ttybuff);
}

/* New public way to set the system default editing chars to their readline
   equivalents. */
void
rl_tty_set_default_bindings (kmap)
     Keymap kmap;
{
  rltty_set_default_bindings (kmap);
}

/* Rebind all of the tty special chars that readline worries about back
   to self-insert.  Call this before saving the current terminal special
   chars with save_tty_chars().  This only works on POSIX termios or termio
   systems. */
void
rl_tty_unset_default_bindings (kmap)
     Keymap kmap;
{
  /* Don't bother before we've saved the tty special chars at least once. */
  if (RL_ISSTATE(RL_STATE_TTYCSAVED) == 0)
    return;

  RESET_SPECIAL (_rl_tty_chars.t_erase);
  RESET_SPECIAL (_rl_tty_chars.t_kill);

#  if defined (VLNEXT) && defined (TERMIOS_TTY_DRIVER)
  RESET_SPECIAL (_rl_tty_chars.t_lnext);
#  endif /* VLNEXT && TERMIOS_TTY_DRIVER */

#  if defined (VWERASE) && defined (TERMIOS_TTY_DRIVER)
  RESET_SPECIAL (_rl_tty_chars.t_werase);
#  endif /* VWERASE && TERMIOS_TTY_DRIVER */
}

#if defined (HANDLE_SIGNALS)

#if defined (NEW_TTY_DRIVER)
int
_rl_disable_tty_signals ()
{
  return 0;
}

int
_rl_restore_tty_signals ()
{
  return 0;
}
#else

static TIOTYPE sigstty, nosigstty;
static int tty_sigs_disabled = 0;

int
_rl_disable_tty_signals ()
{
  if (tty_sigs_disabled)
    return 0;

  if (_get_tty_settings (fileno (rl_instream), &sigstty) < 0)
    return -1;

  nosigstty = sigstty;

  nosigstty.c_lflag &= ~ISIG;
  nosigstty.c_iflag &= ~IXON;

  if (_set_tty_settings (fileno (rl_instream), &nosigstty) < 0)
    return (_set_tty_settings (fileno (rl_instream), &sigstty));

  tty_sigs_disabled = 1;
  return 0;
}

int
_rl_restore_tty_signals ()
{
  int r;

  if (tty_sigs_disabled == 0)
    return 0;

  r = _set_tty_settings (fileno (rl_instream), &sigstty);

  if (r == 0)
    tty_sigs_disabled = 0;

  return r;
}
#endif /* !NEW_TTY_DRIVER */

#endif /* HANDLE_SIGNALS */