terminal.c

在非GUI环境下

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

/* Copyright (C) 1996 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 */

#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"

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

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

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

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;

/* 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 */

/* 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 */

#if defined (TIOCGWINSZ)
  if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
    {
      _rl_screenwidth = (int) window_size.ws_col;
      _rl_screenheight = (int) window_size.ws_row;
    }
#endif /* TIOCGWINSZ */

#if defined (__EMX__)
  _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
#endif

  /* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
     is unset. */
  if (_rl_screenwidth <= 0)
    {
      if (ignore_env == 0 && (ss = sh_get_env_value ("COLUMNS")))
	_rl_screenwidth = atoi (ss);

#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 !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 (rows == 0 || cols == 0)
    return;

  _rl_screenheight = rows;
  _rl_screenwidth = cols;

  if (_rl_term_autowrap == 0)
    _rl_screenwidth--;

  _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_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 },
  { "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