/* 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/>.  */

/* Include the proper files.  */
#ifndef DOS_NT
#ifndef NO_TERMIO
#include <termio.h>
#endif /* not NO_TERMIO */
#include <termios.h>
#include <fcntl.h>
#endif /* not DOS_NT */

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HPUX
#include <sys/bsdtty.h>
#include <sys/ptyio.h>
#endif

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

#ifdef 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


/* 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


/* Manipulate a terminal's current 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.  */

#ifndef DOS_NT
#define EMACS_GET_TTY_PGRP(fd, pgid) (*(pgid) = tcgetpgrp ((fd)))
#define EMACS_SET_TTY_PGRP(fd, pgid) (tcsetpgrp ((fd), *(pgid)))
#endif /* not DOS_NT */

/* 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.  */
#ifndef DOS_NT
  struct termios main;
#else /* DOS_NT */
  int main;
#endif /* DOS_NT */
};

/* 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)))
extern int emacs_get_tty (int, struct emacs_tty *);
extern int emacs_set_tty (int, struct emacs_tty *, int);


/* Define EMACS_TTY_TABS_OK.  */

#ifndef DOS_NT

#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 /* DOS_NT */
#define EMACS_TTY_TABS_OK(p) 0
#endif /* DOS_NT */

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