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/* terminal.c -- controlling the terminal with termcap. */

/* Copyright (C) 1996-2005 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for

   reading lines of text with interactive input and history editing.

   The GNU Readline Library 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 2, or

   (at your option) any later version.

   The GNU Readline Library 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.

   The GNU General Public License is often shipped with GNU software, and

   is generally kept in a file called COPYING or LICENSE.  If you do not

   have a copy of the license, write to the Free Software Foundation,

   59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)

#  include <config.h>

#endif

#include <sys/types.h>

#include "posixstat.h"

#include <fcntl.h>

#if defined (HAVE_SYS_FILE_H)

#  include <sys/file.h>

#endif /* HAVE_SYS_FILE_H */

#if defined (HAVE_UNISTD_H)

#  include <unistd.h>

#endif /* HAVE_UNISTD_H */

#if defined (HAVE_STDLIB_H)

#  include <stdlib.h>

#else

#  include "ansi_stdlib.h"

#endif /* HAVE_STDLIB_H */

#if defined (HAVE_LOCALE_H)

#  include <locale.h>

#endif

#include <stdio.h>

/* System-specific feature definitions and include files. */

#include "rldefs.h"

#if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)

#  include <sys/ioctl.h>

#endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */

#ifdef __MSDOS__

# include <pc.h>

#endif

#include "rltty.h"

#include "tcap.h"

/* Some standard library routines. */

#include "readline.h"

#include "history.h"

#include "rlprivate.h"

#include "rlshell.h"

#include "xmalloc.h"

#if defined (__MINGW32__)

# include <windows.h>

# include <wincon.h>

#endif

#define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)

#define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)

int rl_prefer_env_winsize;

/* **************************************************************** */

/*                                                                  */

/*                      Terminal and Termcap                        */

/*                                                                  */

/* **************************************************************** */

#ifndef __MSDOS__

static char *term_buffer = (char *)NULL;

static char *term_string_buffer = (char *)NULL;

#endif /* !__MSDOS__ */

static int tcap_initialized;

#if !defined (__linux__)

#  if defined (__EMX__) || defined (NEED_EXTERN_PC)

extern

#  endif /* __EMX__ || NEED_EXTERN_PC */

char PC, *BC, *UP;

#endif /* __linux__ */

/* Some strings to control terminal actions.  These are output by tputs (). */

char *_rl_term_clreol;

char *_rl_term_clrpag;

char *_rl_term_cr;

char *_rl_term_backspace;

char *_rl_term_goto;

char *_rl_term_pc;

/* Non-zero if we determine that the terminal can do character insertion. */

int _rl_terminal_can_insert = 0;

/* How to insert characters. */

char *_rl_term_im;

char *_rl_term_ei;

char *_rl_term_ic;

char *_rl_term_ip;

char *_rl_term_IC;

/* How to delete characters. */

char *_rl_term_dc;

char *_rl_term_DC;

#if defined (HACK_TERMCAP_MOTION)

char *_rl_term_forward_char;

#endif  /* HACK_TERMCAP_MOTION */

/* How to go up a line. */

char *_rl_term_up;

/* A visible bell; char if the terminal can be made to flash the screen. */

static char *_rl_visible_bell;

/* Non-zero means the terminal can auto-wrap lines. */

int _rl_term_autowrap = -1;

/* Non-zero means that this terminal has a meta key. */

static int term_has_meta;

/* The sequences to write to turn on and off the meta key, if this

   terminal has one. */

static char *_rl_term_mm;

static char *_rl_term_mo;

/* The key sequences output by the arrow keys, if this terminal has any. */

static char *_rl_term_ku;

static char *_rl_term_kd;

static char *_rl_term_kr;

static char *_rl_term_kl;

/* How to initialize and reset the arrow keys, if this terminal has any. */

static char *_rl_term_ks;

static char *_rl_term_ke;

/* The key sequences sent by the Home and End keys, if any. */

static char *_rl_term_kh;

static char *_rl_term_kH;

static char *_rl_term_at7;      /* @7 */

/* Delete key */

static char *_rl_term_kD;

/* Insert key */

static char *_rl_term_kI;

/* Cursor control */

static char *_rl_term_vs;       /* very visible */

static char *_rl_term_ve;       /* normal */

static void bind_termcap_arrow_keys PARAMS((Keymap));

/* Variables that hold the screen dimensions, used by the display code. */

int _rl_screenwidth, _rl_screenheight, _rl_screenchars;

/* Non-zero means the user wants to enable the keypad. */

int _rl_enable_keypad;

/* Non-zero means the user wants to enable a meta key. */

int _rl_enable_meta = 1;

#if defined (__EMX__)

static void

_emx_get_screensize (swp, shp)

     int *swp, *shp;

{

  int sz[2];

  _scrsize (sz);

  if (swp)

    *swp = sz[0];

  if (shp)

    *shp = sz[1];

}

#endif

/* Get readline's idea of the screen size.  TTY is a file descriptor open

   to the terminal.  If IGNORE_ENV is true, we do not pay attention to the

   values of $LINES and $COLUMNS.  The tests for TERM_STRING_BUFFER being

   non-null serve to check whether or not we have initialized termcap. */

void

_rl_get_screen_size (tty, ignore_env)

     int tty, ignore_env;

{

  char *ss;

#if defined (TIOCGWINSZ)

  struct winsize window_size;

#endif /* TIOCGWINSZ */

  int wr, wc;

  wr = wc = -1;

#if defined (TIOCGWINSZ)

  if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)

    {

      wc = (int) window_size.ws_col;

      wr = (int) window_size.ws_row;

    }

#endif /* TIOCGWINSZ */

  /* For MinGW, we get the console size from the Windows API.  */

#if defined (__MINGW32__)

  HANDLE hConOut = GetStdHandle (STD_OUTPUT_HANDLE);

  if (hConOut != INVALID_HANDLE_VALUE)

    {

      CONSOLE_SCREEN_BUFFER_INFO scr;

      if (GetConsoleScreenBufferInfo (hConOut, &scr))

        {

          wc = scr.dwSize.X;

          wr = scr.srWindow.Bottom - scr.srWindow.Top + 1;

        }

    }

#endif

#if defined (__EMX__)

  _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);

#endif

  if (ignore_env || rl_prefer_env_winsize == 0)

    {

      _rl_screenwidth = wc;

      _rl_screenheight = wr;

    }

  else

    _rl_screenwidth = _rl_screenheight = -1;

  /* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV

     is unset.  If we prefer the environment, check it first before

     assigning the value returned by the kernel. */

  if (_rl_screenwidth <= 0)

    {

      if (ignore_env == 0 && (ss = sh_get_env_value ("COLUMNS")))

        _rl_screenwidth = atoi (ss);

      if (_rl_screenwidth <= 0)

        _rl_screenwidth = wc;

#if defined (__DJGPP__)

      if (_rl_screenwidth <= 0)

        _rl_screenwidth = ScreenCols ();

#else

      if (_rl_screenwidth <= 0 && term_string_buffer)

        _rl_screenwidth = tgetnum ("co");

#endif

    }

  /* Environment variable LINES overrides setting of "li" if IGNORE_ENV

     is unset. */

  if (_rl_screenheight <= 0)

    {

      if (ignore_env == 0 && (ss = sh_get_env_value ("LINES")))

        _rl_screenheight = atoi (ss);

      if (_rl_screenheight <= 0)

        _rl_screenheight = wr;

#if defined (__DJGPP__)

      if (_rl_screenheight <= 0)

        _rl_screenheight = ScreenRows ();

#else

      if (_rl_screenheight <= 0 && term_string_buffer)

        _rl_screenheight = tgetnum ("li");

#endif

    }

  /* If all else fails, default to 80x24 terminal. */

  if (_rl_screenwidth <= 1)

    _rl_screenwidth = 80;

  if (_rl_screenheight <= 0)

    _rl_screenheight = 24;

  /* If we're being compiled as part of bash, set the environment

     variables $LINES and $COLUMNS to new values.  Otherwise, just

     do a pair of putenv () or setenv () calls. */

  sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);

  if (_rl_term_autowrap == 0)

    _rl_screenwidth--;

  _rl_screenchars = _rl_screenwidth * _rl_screenheight;

}

void

_rl_set_screen_size (rows, cols)

     int rows, cols;

{

  if (_rl_term_autowrap == -1)

    _rl_init_terminal_io (rl_terminal_name);

  if (rows > 0)

    _rl_screenheight = rows;

  if (cols > 0)

    {

      _rl_screenwidth = cols;

      if (_rl_term_autowrap == 0)

        _rl_screenwidth--;

    }

  if (rows > 0 || cols > 0)

    _rl_screenchars = _rl_screenwidth * _rl_screenheight;

}

void

rl_set_screen_size (rows, cols)

     int rows, cols;

{

  _rl_set_screen_size (rows, cols);

}

void

rl_get_screen_size (rows, cols)

     int *rows, *cols;

{

  if (rows)

    *rows = _rl_screenheight;

  if (cols)

    *cols = _rl_screenwidth;

}

void

rl_reset_screen_size ()

{

  _rl_get_screen_size (fileno (rl_instream), 0);

}

void

rl_resize_terminal ()

{

  if (readline_echoing_p)

    {

      _rl_get_screen_size (fileno (rl_instream), 1);

      if (CUSTOM_REDISPLAY_FUNC ())

        rl_forced_update_display ();

      else

        _rl_redisplay_after_sigwinch ();

    }

}

struct _tc_string {

     const char *tc_var;

     char **tc_value;

};

/* This should be kept sorted, just in case we decide to change the

   search algorithm to something smarter. */

static struct _tc_string tc_strings[] =

{

  { "@7", &_rl_term_at7 },

  { "DC", &_rl_term_DC },

  { "IC", &_rl_term_IC },

  { "ce", &_rl_term_clreol },

  { "cl", &_rl_term_clrpag },

  { "cr", &_rl_term_cr },

  { "dc", &_rl_term_dc },

  { "ei", &_rl_term_ei },

  { "ic", &_rl_term_ic },

  { "im", &_rl_term_im },

  { "kD", &_rl_term_kD },       /* delete */

  { "kH", &_rl_term_kH },       /* home down ?? */

  { "kI", &_rl_term_kI },       /* insert */

  { "kd", &_rl_term_kd },

  { "ke", &_rl_term_ke },       /* end keypad mode */

  { "kh", &_rl_term_kh },       /* home */

  { "kl", &_rl_term_kl },

  { "kr", &_rl_term_kr },

  { "ks", &_rl_term_ks },       /* start keypad mode */

  { "ku", &_rl_term_ku },

  { "le", &_rl_term_backspace },

  { "mm", &_rl_term_mm },

  { "mo", &_rl_term_mo },

#if defined (HACK_TERMCAP_MOTION)

  { "nd", &_rl_term_forward_char },

#endif

  { "pc", &_rl_term_pc },

  { "up", &_rl_term_up },

  { "vb", &_rl_visible_bell },

  { "vs", &_rl_term_vs },

  { "ve", &_rl_term_ve },

};

#define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))

/* Read the desired terminal capability strings into BP.  The capabilities

   are described in the TC_STRINGS table. */

static void

get_term_capabilities (bp)

     char **bp;

{

#if !defined (__DJGPP__)        /* XXX - doesn't DJGPP have a termcap library? */

  register int i;

  for (i = 0; i < NUM_TC_STRINGS; i++)

    *(tc_strings[i].tc_value) = tgetstr ((char *)tc_strings[i].tc_var, bp);

#endif

  tcap_initialized = 1;

}

int

_rl_init_terminal_io (terminal_name)

     const char *terminal_name;

{

  const char *term;

  char *buffer;

  int tty, tgetent_ret;

  term = terminal_name ? terminal_name : sh_get_env_value ("TERM");

  _rl_term_clrpag = _rl_term_cr = _rl_term_clreol = (char *)NULL;

  tty = rl_instream ? fileno (rl_instream) : 0;

  if (term == 0)

    term = "dumb";

#ifdef __MSDOS__

  _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;

  _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;

  _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;

  _rl_term_mm = _rl_term_mo = (char *)NULL;

  _rl_terminal_can_insert = term_has_meta = _rl_term_autowrap = 0;

  _rl_term_cr = "\r";

  _rl_term_clreol = _rl_term_clrpag = _rl_term_backspace = (char *)NULL;

  _rl_term_goto = _rl_term_pc = _rl_term_ip = (char *)NULL;

  _rl_term_ks = _rl_term_ke =_rl_term_vs = _rl_term_ve = (char *)NULL;

  _rl_term_kh = _rl_term_kH = _rl_term_at7 = _rl_term_kI = (char *)NULL;

#if defined(HACK_TERMCAP_MOTION)

  _rl_term_forward_char = (char *)NULL;

#endif

  _rl_get_screen_size (tty, 0);

#else  /* !__MSDOS__ */

  /* I've separated this out for later work on not calling tgetent at all

     if the calling application has supplied a custom redisplay function,

     (and possibly if the application has supplied a custom input function). */

  if (CUSTOM_REDISPLAY_FUNC())

    {

      tgetent_ret = -1;

    }

  else

    {

      if (term_string_buffer == 0)

        term_string_buffer = (char *)xmalloc(2032);

      if (term_buffer == 0)

        term_buffer = (char *)xmalloc(4080);

      buffer = term_string_buffer;

      tgetent_ret = tgetent (term_buffer, term);

    }

  if (tgetent_ret <= 0)

    {

      FREE (term_string_buffer);

      FREE (term_buffer);

      buffer = term_buffer = term_string_buffer = (char *)NULL;

      _rl_term_autowrap = 0;     /* used by _rl_get_screen_size */

      /* Allow calling application to set default height and width, using

         rl_set_screen_size */

      if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)

        {

#if defined (__EMX__)

          _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);

          _rl_screenwidth--;

#else /* !__EMX__ */

          _rl_get_screen_size (tty, 0);

#endif /* !__EMX__ */

        }

      /* Defaults. */

      if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)

        {

          _rl_screenwidth = 79;

          _rl_screenheight = 24;

        }

      /* Everything below here is used by the redisplay code (tputs). */

      _rl_screenchars = _rl_screenwidth * _rl_screenheight;

      _rl_term_cr = "\r";

      _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;

      _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;

      _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;

      _rl_term_kh = _rl_term_kH = _rl_term_kI = _rl_term_kD = (char *)NULL;

      _rl_term_ks = _rl_term_ke = _rl_term_at7 = (char *)NULL;

      _rl_term_mm = _rl_term_mo = (char *)NULL;

      _rl_term_ve = _rl_term_vs = (char *)NULL;

#if defined (HACK_TERMCAP_MOTION)

      term_forward_char = (char *)NULL;

#endif

      _rl_terminal_can_insert = term_has_meta = 0;

      /* Reasonable defaults for tgoto().  Readline currently only uses

         tgoto if _rl_term_IC or _rl_term_DC is defined, but just in case we

         change that later... */

      PC = '\0';

      BC = _rl_term_backspace = "\b";

      UP = _rl_term_up;

      return 0;

    }

  get_term_capabilities (&buffer);

  /* Set up the variables that the termcap library expects the application

     to provide. */

  PC = _rl_term_pc ? *_rl_term_pc : 0;

  BC = _rl_term_backspace;

  UP = _rl_term_up;

  if (!_rl_term_cr)

    _rl_term_cr = "\r";

  _rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");

  /* Allow calling application to set default height and width, using

     rl_set_screen_size */

  if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)

    _rl_get_screen_size (tty, 0);

  /* "An application program can assume that the terminal can do

      character insertion if *any one of* the capabilities `IC',

      `im', `ic' or `ip' is provided."  But we can't do anything if

      only `ip' is provided, so... */

  _rl_terminal_can_insert = (_rl_term_IC || _rl_term_im || _rl_term_ic);

  /* Check to see if this terminal has a meta key and clear the capability

     variables if there is none. */

  term_has_meta = (tgetflag ("km") || tgetflag ("MT"));

  if (!term_has_meta)

    _rl_term_mm = _rl_term_mo = (char *)NULL;

#endif /* !__MSDOS__ */

  /* Attempt to find and bind the arrow keys.  Do not override already

     bound keys in an overzealous attempt, however. */

  bind_termcap_arrow_keys (emacs_standard_keymap);

#if defined (VI_MODE)

  bind_termcap_arrow_keys (vi_movement_keymap);

  bind_termcap_arrow_keys (vi_insertion_keymap);

#endif /* VI_MODE */

  return 0;

}

/* Bind the arrow key sequences from the termcap description in MAP. */

static void

bind_termcap_arrow_keys (map)

     Keymap map;

{

  Keymap xkeymap;

  xkeymap = _rl_keymap;

  _rl_keymap = map;

  rl_bind_keyseq_if_unbound (_rl_term_ku, rl_get_previous_history);

  rl_bind_keyseq_if_unbound (_rl_term_kd, rl_get_next_history);

  rl_bind_keyseq_if_unbound (_rl_term_kr, rl_forward_char);

  rl_bind_keyseq_if_unbound (_rl_term_kl, rl_backward_char);

  rl_bind_keyseq_if_unbound (_rl_term_kh, rl_beg_of_line);      /* Home */

  rl_bind_keyseq_if_unbound (_rl_term_at7, rl_end_of_line);     /* End */

  rl_bind_keyseq_if_unbound (_rl_term_kD, rl_delete);

  _rl_keymap = xkeymap;

}

char *

rl_get_termcap (cap)

     const char *cap;

{

  register int i;

  if (tcap_initialized == 0)

    return ((char *)NULL);

  for (i = 0; i < NUM_TC_STRINGS; i++)

    {

      if (tc_strings[i].tc_var[0] == cap[0] && strcmp (tc_strings[i].tc_var, cap) == 0)

        return *(tc_strings[i].tc_value);

    }

  return ((char *)NULL);

}

/* Re-initialize the terminal considering that the TERM/TERMCAP variable

   has changed. */

int

rl_reset_terminal (terminal_name)

     const char *terminal_name;

{

  _rl_screenwidth = _rl_screenheight = 0;

  _rl_init_terminal_io (terminal_name);

  return 0;

}

/* A function for the use of tputs () */

#ifdef _MINIX

void

_rl_output_character_function (c)

     int c;

{

  putc (c, _rl_out_stream);

}

#else /* !_MINIX */

int

_rl_output_character_function (c)

     int c;

{

  return putc (c, _rl_out_stream);

}

#endif /* !_MINIX */

/* Write COUNT characters from STRING to the output stream. */

void

_rl_output_some_chars (string, count)

     const char *string;

     int count;

{

  fwrite (string, 1, count, _rl_out_stream);

}

/* Move the cursor back. */

int

_rl_backspace (count)

     int count;

{

  register int i;

#ifndef __MSDOS__

  if (_rl_term_backspace)

    for (i = 0; i < count; i++)

      tputs (_rl_term_backspace, 1, _rl_output_character_function);

  else

#endif

    for (i = 0; i < count; i++)

      putc ('\b', _rl_out_stream);

  return 0;

}

/* Move to the start of the next line. */

int

rl_crlf ()

{

#if defined (NEW_TTY_DRIVER)

  if (_rl_term_cr)

    tputs (_rl_term_cr, 1, _rl_output_character_function);

#endif /* NEW_TTY_DRIVER */

  putc ('\n', _rl_out_stream);

  return 0;

}

/* Ring the terminal bell. */

int

rl_ding ()

{

  if (readline_echoing_p)

    {

      switch (_rl_bell_preference)

        {

        case NO_BELL:

        default:

          break;

        case VISIBLE_BELL:

#ifdef __MSDOS__

          ScreenVisualBell ();

          break;

#else

          if (_rl_visible_bell)

            {

              tputs (_rl_visible_bell, 1, _rl_output_character_function);

              break;

            }