/* systty.h - System-dependent definitions for terminals.
   Copyright (C) 1993, 1994, 2001, 2002, 2003, 2004,
                 2005, 2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_TERMIOS
#define HAVE_TCATTR
#endif


/* Include the proper files.  */
#ifdef HAVE_TERMIO
#ifndef NO_TERMIO
#include <termio.h>
#endif /* not NO_TERMIO */
#ifndef INCLUDED_FCNTL
#define INCLUDED_FCNTL
#include <fcntl.h>
#endif
#else /* not HAVE_TERMIO */
#ifdef HAVE_TERMIOS
#ifndef NO_TERMIO
#include <termio.h>
#endif
#include <termios.h>
#define INCLUDED_FCNTL
#include <fcntl.h>
#else /* neither HAVE_TERMIO nor HAVE_TERMIOS */
#ifndef DOS_NT
#include <sgtty.h>
#endif /* not DOS_NT */
#endif /* not HAVE_TERMIOS */
#endif /* not HAVE_TERMIO */

#ifdef __GNU_LIBRARY__
#include <sys/ioctl.h>
#include <termios.h>
#endif

#ifdef NEED_BSDTTY
#include <sys/bsdtty.h>
#endif

#if defined (HPUX) && defined (HAVE_PTYS)
#include <sys/ptyio.h>
#endif

#ifdef AIX
#include <sys/pty.h>
#endif /* AIX */

#if (defined (POSIX) || defined (NEED_UNISTD_H)) && defined (HAVE_UNISTD_H)
#include <unistd.h>
#endif


/* Special cases - inhibiting the use of certain features.  */

/* Allow m- file to inhibit use of FIONREAD.  */
#ifdef BROKEN_FIONREAD
#undef FIONREAD
#undef ASYNC
#endif

/* Interrupt input is not used if there is no FIONREAD.  */
#ifndef FIONREAD
#undef SIGIO
#endif

/* On TERMIOS systems, the tcmumbleattr calls take care of these
   parameters, and it's a bad idea to use them (on AIX, it makes the
   tty hang for a long time).  */
#if defined (TIOCGLTC) && !defined (HAVE_TERMIOS)
#define HAVE_LTCHARS
#endif

#if defined (TIOCGETC) && !defined (HAVE_TERMIOS)
#define HAVE_TCHARS
#endif


/* Try to establish the correct character to disable terminal functions
   in a system-independent manner.  Note that USG (at least) define
   _POSIX_VDISABLE as 0!  */

#ifdef _POSIX_VDISABLE
#define CDISABLE _POSIX_VDISABLE
#else /* not _POSIX_VDISABLE */
#ifdef CDEL
#undef CDISABLE
#define CDISABLE CDEL
#else /* not CDEL */
#define CDISABLE 255
#endif /* not CDEL */
#endif /* not _POSIX_VDISABLE */

/* Get the number of characters queued for output.  */

/* EMACS_OUTQSIZE(FD, int *SIZE) stores the number of characters
   queued for output to the terminal FD in *SIZE, if FD is a tty.
   Returns -1 if there was an error (i.e. FD is not a tty), 0
   otherwise.  */
#ifdef TIOCOUTQ
#define EMACS_OUTQSIZE(fd, size) (ioctl ((fd), TIOCOUTQ, (size)))
#endif

#ifdef HAVE_TERMIO
#ifdef TCOUTQ
#undef EMACS_OUTQSIZE
#define EMACS_OUTQSIZE(fd, size) (ioctl ((fd), TCOUTQ, (size)))
#endif
#endif


/* Manipulate a terminal's current process group.  */

/* EMACS_HAVE_TTY_PGRP is true if we can get and set the tty's current
   controlling process group.

   EMACS_GET_TTY_PGRP(int FD, int *PGID) sets *PGID the terminal FD's
   current process group.  Return -1 if there is an error.

   EMACS_SET_TTY_PGRP(int FD, int *PGID) sets the terminal FD's
   current process group to *PGID.  Return -1 if there is an error.  */

/* HPUX tty process group stuff doesn't work, says the anonymous voice
   from the past.  */
#ifndef HPUX
#ifdef TIOCGPGRP
#define EMACS_HAVE_TTY_PGRP
#else
#ifdef HAVE_TERMIOS
#define EMACS_HAVE_TTY_PGRP
#endif /* HAVE_TERMIOS */
#endif /* TIOCGPGRP */
#endif /* not HPUX */

#ifdef EMACS_HAVE_TTY_PGRP

#if defined (HAVE_TERMIOS)

#define EMACS_GET_TTY_PGRP(fd, pgid) (*(pgid) = tcgetpgrp ((fd)))
#define EMACS_SET_TTY_PGRP(fd, pgid) (tcsetpgrp ((fd), *(pgid)))

#else /* not HAVE_TERMIOS */
#ifdef TIOCSPGRP

#define EMACS_GET_TTY_PGRP(fd, pgid) (ioctl ((fd), TIOCGPGRP, (pgid)))
#define EMACS_SET_TTY_PGRP(fd, pgid) (ioctl ((fd), TIOCSPGRP, (pgid)))

#endif /* TIOCSPGRP */
#endif /* HAVE_TERMIOS */

#else /* not EMACS_SET_TTY_PGRP */

/* Just ignore this for now and hope for the best */
#define EMACS_GET_TTY_PGRP(fd, pgid) 0
#define EMACS_SET_TTY_PGRP(fd, pgif) 0

#endif /* not EMACS_SET_TTY_PGRP */

/* EMACS_GETPGRP (arg) returns the process group of the process.  */

#if defined (GETPGRP_VOID)
#  define EMACS_GETPGRP(x) getpgrp()
#else /* !GETPGRP_VOID */
#  define EMACS_GETPGRP(x) getpgrp(x)
#endif /* !GETPGRP_VOID */

/* Manipulate a TTY's input/output processing parameters.  */

/* struct emacs_tty is a structure used to hold the current tty
   parameters.  If the terminal has several structures describing its
   state, for example a struct tchars, a struct sgttyb, a struct
   tchars, a struct ltchars, and a struct pagechars, struct
   emacs_tty should contain an element for each parameter struct
   that Emacs may change.

   EMACS_GET_TTY (int FD, struct emacs_tty *P) stores the parameters
   of the tty on FD in *P.  Return zero if all's well, or -1 if we ran
   into an error we couldn't deal with.

   EMACS_SET_TTY (int FD, struct emacs_tty *P, int flushp)
   sets the parameters of the tty on FD according to the contents of
   *P.  If flushp is non-zero, we discard queued input to be
   written before making the change.
   Return 0 if all went well, and -1 if anything failed.

   EMACS_TTY_TABS_OK (struct emacs_tty *P) is false if the kernel
   expands tabs to spaces upon output; in that case, there is no
   advantage to using tabs over spaces.  */


/* For each tty parameter structure that Emacs might want to save and restore,
   - include an element for it in this structure, and
   - extend the emacs_{get,set}_tty functions in sysdep.c to deal with the
     new members.  */

struct emacs_tty {

/* There is always one of the following elements, so there is no need
   for dummy get and set definitions.  */
#ifdef HAVE_TCATTR
  struct termios main;
#else /* not HAVE_TCATTR */
#ifdef HAVE_TERMIO
  struct termio main;
#else /* not HAVE_TERMIO */
#ifdef DOS_NT
  int main;
#else  /* not DOS_NT */
  struct sgttyb main;
#endif /* not DOS_NT */
#endif /* not HAVE_TERMIO */
#endif /* not HAVE_TCATTR */

/* If we have TERMIOS, we don't need to do this - they're taken care of
   by the tc*attr calls.  */
#ifndef HAVE_TERMIOS
#ifdef HAVE_LTCHARS
  struct ltchars ltchars;
#endif /* HAVE_LTCHARS */

#ifdef HAVE_TCHARS
  struct tchars tchars;
  int lmode;
#endif /* HAVE_TCHARS */
#endif /* not defined HAVE_TERMIOS */
};

/* Define EMACS_GET_TTY and EMACS_SET_TTY,
   the macros for reading and setting parts of `struct emacs_tty'.

   These got pretty unmanageable (huge macros are hard to debug), and
   finally needed some code which couldn't be done as part of an
   expression, so we moved them out to their own functions in sysdep.c.  */
#define EMACS_GET_TTY(fd, p)        (emacs_get_tty ((fd), (p)))
#define EMACS_SET_TTY(fd, p, waitp) (emacs_set_tty ((fd), (p), (waitp)))
#ifdef P_  /* Unfortunately this file is sometimes included before lisp.h */
extern int emacs_get_tty P_ ((int, struct emacs_tty *));
extern int emacs_set_tty P_ ((int, struct emacs_tty *, int));
#endif


/* Define EMACS_TTY_TABS_OK.  */

#ifdef HAVE_TERMIOS

#ifdef TABDLY
#define EMACS_TTY_TABS_OK(p) (((p)->main.c_oflag & TABDLY) != TAB3)
#else /* not TABDLY */
#define EMACS_TTY_TABS_OK(p) 1
#endif /* not TABDLY */

#else /* not def HAVE_TERMIOS */
#ifdef HAVE_TERMIO

#define EMACS_TTY_TABS_OK(p) (((p)->main.c_oflag & TABDLY) != TAB3)

#else /* neither HAVE_TERMIO nor HAVE_TERMIOS */

#ifdef DOS_NT
#define EMACS_TTY_TABS_OK(p) 0
#else /* not DOS_NT */
#define EMACS_TTY_TABS_OK(p) (((p)->main.sg_flags & XTABS) != XTABS)
#endif /* not DOS_NT */

#endif /* not def HAVE_TERMIO */
#endif /* not def HAVE_TERMIOS */

/* arch-tag: cf4b90bc-be41-401c-be98-40619178a712
   (do not change this comment) */
