terminal.c

android-w.song.android.widget

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

/* Copyright (C) 1996-2009 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library (Readline), a library
   for reading lines of text with interactive input and history editing.      

   Readline 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.

   Readline 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 Readline.  If not, see <http://www.gnu.org/licenses/>.
*/

#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 */

#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>

static void _win_get_screensize PARAMS((int *, int *));
#endif

#if defined (__EMX__)
static void _emx_get_screensize PARAMS((int *, int *));
#endif

#define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)
#define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)

/*  If the calling application sets this to a non-zero value, readline will
    use the $LINES and $COLUMNS environment variables to set its idea of the
    window size before interrogating the kernel. */
int rl_prefer_env_winsize = 0;

/* **************************************************************** */
/*								    */
/*			Terminal and Termcap			    */
/*								    */
/* **************************************************************** */

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

static int tcap_initialized;

#if !defined (__linux__) && !defined (NCURSES_VERSION)
#  if defined (__EMX__) || defined (NEED_EXTERN_PC)
extern 
#  endif /* __EMX__ || NEED_EXTERN_PC */
char PC, *BC, *UP;
#endif /* !__linux__ && !NCURSES_VERSION */

/* 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;

char *_rl_term_forward_char;

/* 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

#if defined (__MINGW32__)
static void
_win_get_screensize (swp, shp)
     int *swp, *shp;
{
  HANDLE hConOut;
  CONSOLE_SCREEN_BUFFER_INFO scr;

  hConOut = GetStdHandle (STD_OUTPUT_HANDLE);
  if (hConOut != INVALID_HANDLE_VALUE)
    {
      if (GetConsoleScreenBufferInfo (hConOut, &scr))
	{
	  *swp = scr.dwSize.X;
	  *shp = scr.srWindow.Bottom - scr.srWindow.Top + 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 */

#if defined (__EMX__)
  _emx_get_screensize (&wc, &wr);
#elif defined (__MINGW32__)
  _win_get_screensize (&wc, &wr);
#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 && 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 && 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 ()
{
  _rl_get_screen_size (fileno (rl_instream), 1);
  if (_rl_echoing_p)
    {
      if (CUSTOM_REDISPLAY_FUNC ())
	rl_forced_update_display ();
      else if (RL_ISSTATE(RL_STATE_REDISPLAYING) == 0)
	_rl_redisplay_after_sigwinch ();
    }
}

struct _tc_string {
     const char * const tc_var;
     char **tc_value;
};