terminal.c

UNIX下SH的实现源码

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

/* Copyright (C) 1996, 2000 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"

/* When not standalone (as in using Bash), the termcap API
   is always available.  */
#if !defined (HAVE_TERMCAP_API) && !defined (RL_LIBRARY_VERSION)
#define HAVE_TERMCAP_API
#endif

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

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

static int tcap_initialized;

/* Non-zero means this terminal can't really do anything. */
static int dumb_term;

#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 *term_goto, *term_clreol, *term_cr, *term_clrpag, *term_backspace;
char *term_pc;

/* Non-zero if we determine that the terminal can do character insertion. */
int terminal_can_insert = 0;

/* How to insert characters. */
char *term_im, *term_ei, *term_ic, *term_ip, *term_IC;

/* How to delete characters. */
char *term_dc, *term_DC;

#if defined (HACK_TERMCAP_MOTION)
char *term_forward_char;
#endif  /* HACK_TERMCAP_MOTION */

/* How to go up a line. */
char *term_up;

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

/* The key sequences output by the arrow keys, if this terminal has any. */
static char *term_ku, *term_kd, *term_kr, *term_kl;

/* How to initialize and reset the arrow keys, if this terminal has any. */
static char *term_ks, *term_ke;

/* The key sequences sent by the Home and End keys, if any. */
static char *term_kh, *term_kH;

/* Variables that hold the screen dimensions, used by the display code. */
int screenwidth, screenheight, 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
_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 (__DJGPP__)
#include <conio.h>

static void
_get_screensize (swp, shp)
     int *swp, *shp;
{
  struct text_info screen_info;
  gettextinfo (&screen_info);
  *swp = (int)screen_info.screenwidth;
  *shp = (int)screen_info.screenheight;
}
#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)
    {
      screenwidth = (int) window_size.ws_col;
      screenheight = (int) window_size.ws_row;
    }
#endif /* TIOCGWINSZ */

#if defined (__EMX__) || defined (__DJGPP__)
  _get_screensize (&screenwidth, &screenheight);
#endif

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

#if defined (HAVE_TERMCAP_API)
      if (screenwidth <= 0 && term_string_buffer)
	screenwidth = tgetnum ("co");
#endif
    }

  /* Environment variable LINES overrides setting of "li" if IGNORE_ENV
     is unset. */
  if (screenheight <= 0)
    {
      if (ignore_env == 0 && (ss = get_env_value ("LINES")))
	screenheight = atoi (ss);

#if defined (HAVE_TERMCAP_API)
      if (screenheight <= 0 && term_string_buffer)
	screenheight = tgetnum ("li");
#endif
    }

  /* If all else fails, default to 80x24 terminal. */
  if (screenwidth <= 1)
    screenwidth = 80;

  if (screenheight <= 0)
    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. */
  set_lines_and_columns (screenheight, screenwidth);

  if (_rl_term_autowrap == 0)
    screenwidth--;

  screenchars = screenwidth * screenheight;
}

void
_rl_set_screen_size (rows, cols)
     int rows, cols;
{
  screenheight = rows;
  screenwidth = cols;

  if (_rl_term_autowrap == 0)
    screenwidth--;

  screenchars = screenwidth * screenheight;
}

void
rl_resize_terminal ()
{
  if (readline_echoing_p)
    {
      _rl_get_screen_size (fileno (rl_instream), 1);
      _rl_redisplay_after_sigwinch ();
    }
}

struct _tc_string {
     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[] =
{
  { "DC", &term_DC },
  { "IC", &term_IC },
  { "ce", &term_clreol },
  { "cl", &term_clrpag },
  { "cr", &term_cr },
  { "dc", &term_dc },
  { "ei", &term_ei },
  { "ic", &term_ic },
  { "im", &term_im },
  { "kd", &term_kd },
  { "kh", &term_kh },	/* home */
  { "kH", &term_kH },	/* end */
  { "kl", &term_kl },
  { "kr", &term_kr },
  { "ku", &term_ku },
  { "ks", &term_ks },
  { "ke", &term_ke },
  { "le", &term_backspace },
  { "mm", &term_mm },
  { "mo", &term_mo },
#if defined (HACK_TERMCAP_MOTION)
  { "nd", &term_forward_char },
#endif
  { "pc", &term_pc },
  { "up", &term_up },