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/* terminal.c -- controlling the terminal with termcap. */
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/* Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 1, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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#include <sys/types.h>
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#include "posixstat.h"
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#if defined (HAVE_SYS_FILE_H)
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# include <sys/file.h>
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#endif /* HAVE_SYS_FILE_H */
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#if defined (HAVE_UNISTD_H)
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (HAVE_LOCALE_H)
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/* System-specific feature definitions and include files. */
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#if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
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# include <sys/ioctl.h>
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#endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
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/* Some standard library routines. */
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/* Variables and functions imported from readline.c */
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extern FILE *_rl_in_stream, *_rl_out_stream;
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extern int readline_echoing_p;
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extern int _rl_bell_preference;
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extern Keymap _rl_keymap;
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/* Functions imported from bind.c */
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extern void _rl_bind_if_unbound ();
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/* Functions imported from shell.c */
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extern void set_lines_and_columns ();
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extern char *get_env_value ();
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/* **************************************************************** */
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/* Terminal and Termcap */
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/* **************************************************************** */
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static char *term_buffer = (char *)NULL;
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static char *term_string_buffer = (char *)NULL;
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static int tcap_initialized;
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/* Non-zero means this terminal can't really do anything. */
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#if !defined (__linux__)
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# if defined (__EMX__) || defined (NEED_EXTERN_PC)
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# endif /* __EMX__ || NEED_EXTERN_PC */
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#endif /* __linux__ */
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/* Some strings to control terminal actions. These are output by tputs (). */
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char *term_goto, *term_clreol, *term_cr, *term_clrpag, *term_backspace;
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/* Non-zero if we determine that the terminal can do character insertion. */
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int terminal_can_insert = 0;
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/* How to insert characters. */
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char *term_im, *term_ei, *term_ic, *term_ip, *term_IC;
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/* How to delete characters. */
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char *term_dc, *term_DC;
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#if defined (HACK_TERMCAP_MOTION)
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char *term_forward_char;
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#endif /* HACK_TERMCAP_MOTION */
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/* How to go up a line. */
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/* A visible bell, if the terminal can be made to flash the screen. */
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static char *visible_bell;
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/* Non-zero means the terminal can auto-wrap lines. */
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int _rl_term_autowrap;
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/* Non-zero means that this terminal has a meta key. */
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static int term_has_meta;
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/* The sequences to write to turn on and off the meta key, if this
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static char *term_mm, *term_mo;
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/* The key sequences output by the arrow keys, if this terminal has any. */
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static char *term_ku, *term_kd, *term_kr, *term_kl;
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/* How to initialize and reset the arrow keys, if this terminal has any. */
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static char *term_ks, *term_ke;
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/* The key sequences sent by the Home and End keys, if any. */
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static char *term_kh, *term_kH;
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/* Variables that hold the screen dimensions, used by the display code. */
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int screenwidth, screenheight, screenchars;
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/* Non-zero means the user wants to enable the keypad. */
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int _rl_enable_keypad;
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/* Non-zero means the user wants to enable a meta key. */
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int _rl_enable_meta = 1;
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/* Get readline's idea of the screen size. TTY is a file descriptor open
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to the terminal. If IGNORE_ENV is true, we do not pay attention to the
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values of $LINES and $COLUMNS. The tests for TERM_STRING_BUFFER being
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non-null serve to check whether or not we have initialized termcap. */
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_rl_get_screen_size (tty, ignore_env)
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#if defined (TIOCGWINSZ)
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struct winsize window_size;
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#endif /* TIOCGWINSZ */
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#if defined (__EMX__)
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#if defined (TIOCGWINSZ)
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if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
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screenwidth = (int) window_size.ws_col;
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screenheight = (int) window_size.ws_row;
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#endif /* TIOCGWINSZ */
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#if defined (__EMX__)
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screenheight = sz[1];
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/* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
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if (screenwidth <= 0)
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if (ignore_env == 0 && (ss = get_env_value ("COLUMNS")))
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screenwidth = atoi (ss);
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if (screenwidth <= 0 && term_string_buffer)
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screenwidth = tgetnum ("co");
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/* Environment variable LINES overrides setting of "li" if IGNORE_ENV
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if (screenheight <= 0)
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if (ignore_env == 0 && (ss = get_env_value ("LINES")))
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screenheight = atoi (ss);
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if (screenheight <= 0 && term_string_buffer)
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screenheight = tgetnum ("li");
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/* If all else fails, default to 80x24 terminal. */
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if (screenwidth <= 1)
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if (screenheight <= 0)
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/* If we're being compiled as part of bash, set the environment
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variables $LINES and $COLUMNS to new values. Otherwise, just
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do a pair of putenv () or setenv () calls. */
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set_lines_and_columns (screenheight, screenwidth);
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if (!_rl_term_autowrap)
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screenchars = screenwidth * screenheight;
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_rl_set_screen_size (rows, cols)
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if (_rl_term_autowrap == 0)
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screenchars = screenwidth * screenheight;
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rl_resize_terminal ()
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if (readline_echoing_p)
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_rl_get_screen_size (fileno (rl_instream), 1);
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_rl_redisplay_after_sigwinch ();
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/* This should be kept sorted, just in case we decide to change the
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search algorithm to something smarter. */
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static struct _tc_string tc_strings[] =
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"kh", &term_kh, /* home */
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"kH", &term_kH, /* end */
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"le", &term_backspace,
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#if defined (HACK_TERMCAP_MOTION)
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"nd", &term_forward_char,
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#define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))
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/* Read the desired terminal capability strings into BP. The capabilities
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are described in the TC_STRINGS table. */
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get_term_capabilities (bp)
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for (i = 0; i < NUM_TC_STRINGS; i++)
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*(tc_strings[i].tc_value) = tgetstr (tc_strings[i].tc_var, bp);
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tcap_initialized = 1;
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_rl_init_terminal_io (terminal_name)
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#if defined (__GO32__)
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screenwidth = ScreenCols ();
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screenheight = ScreenRows ();
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screenchars = screenwidth * screenheight;
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term_im = term_ei = term_ic = term_IC = (char *)NULL;
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term_up = term_dc = term_DC = visible_bell = (char *)NULL;
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/* Does the __GO32__ have a meta key? I don't know. */
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term_mm = term_mo = (char *)NULL;
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/* It probably has arrow keys, but I don't know what they are. */
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term_ku = term_kd = term_kr = term_kl = (char *)NULL;
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#if defined (HACK_TERMCAP_MOTION)
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term_forward_char = (char *)NULL;
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#endif /* HACK_TERMCAP_MOTION */
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terminal_can_insert = _rl_term_autowrap = 0;
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#else /* !__GO32__ */
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term = terminal_name ? terminal_name : get_env_value ("TERM");
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if (term_string_buffer == 0)
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term_string_buffer = xmalloc (2032);
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if (term_buffer == 0)
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term_buffer = xmalloc (4080);
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buffer = term_string_buffer;
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term_clrpag = term_cr = term_clreol = (char *)NULL;
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if (tgetent (term_buffer, term) <= 0)
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screenchars = 79 * 24;
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term_im = term_ei = term_ic = term_IC = (char *)NULL;
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term_up = term_dc = term_DC = visible_bell = (char *)NULL;
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term_ku = term_kd = term_kl = term_kr = (char *)NULL;
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#if defined (HACK_TERMCAP_MOTION)
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term_forward_char = (char *)NULL;
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terminal_can_insert = 0;
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get_term_capabilities (&buffer);
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/* Set up the variables that the termcap library expects the application
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PC = term_pc ? *term_pc : 0;
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tty = rl_instream ? fileno (rl_instream) : 0;
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screenwidth = screenheight = 0;
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_rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");
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_rl_get_screen_size (tty, 0);
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/* "An application program can assume that the terminal can do
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character insertion if *any one of* the capabilities `IC',
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`im', `ic' or `ip' is provided." But we can't do anything if
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only `ip' is provided, so... */
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terminal_can_insert = (term_IC || term_im || term_ic);
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/* Check to see if this terminal has a meta key and clear the capability
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variables if there is none. */
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term_has_meta = (tgetflag ("km") || tgetflag ("MT"));
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term_mm = term_mo = (char *)NULL;
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/* Attempt to find and bind the arrow keys. Do not override already
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bound keys in an overzealous attempt, however. */
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xkeymap = _rl_keymap;
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_rl_keymap = emacs_standard_keymap;
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_rl_bind_if_unbound (term_ku, rl_get_previous_history);
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_rl_bind_if_unbound (term_kd, rl_get_next_history);
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_rl_bind_if_unbound (term_kr, rl_forward);
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_rl_bind_if_unbound (term_kl, rl_backward);
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_rl_bind_if_unbound (term_kh, rl_beg_of_line); /* Home */
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_rl_bind_if_unbound (term_kH, rl_end_of_line); /* End */
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#if defined (VI_MODE)
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_rl_keymap = vi_movement_keymap;
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_rl_bind_if_unbound (term_ku, rl_get_previous_history);
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_rl_bind_if_unbound (term_kd, rl_get_next_history);
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_rl_bind_if_unbound (term_kr, rl_forward);
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_rl_bind_if_unbound (term_kl, rl_backward);
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_rl_bind_if_unbound (term_kh, rl_beg_of_line); /* Home */
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_rl_bind_if_unbound (term_kH, rl_end_of_line); /* End */
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_rl_keymap = xkeymap;
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#endif /* !__GO32__ */
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if (tcap_initialized == 0)
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return ((char *)NULL);
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for (i = 0; i < NUM_TC_STRINGS; i++)
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if (tc_strings[i].tc_var[0] == cap[0] && strcmp (tc_strings[i].tc_var, cap) == 0)
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return *(tc_strings[i].tc_value);
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return ((char *)NULL);
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/* Re-initialize the terminal considering that the TERM/TERMCAP variable
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rl_reset_terminal (terminal_name)
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_rl_init_terminal_io (terminal_name);
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/* A function for the use of tputs () */
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_rl_output_character_function (c)
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putc (c, _rl_out_stream);
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_rl_output_character_function (c)
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return putc (c, _rl_out_stream);
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/* Write COUNT characters from STRING to the output stream. */
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_rl_output_some_chars (string, count)
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fwrite (string, 1, count, _rl_out_stream);
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/* Move the cursor back. */
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_rl_backspace (count)
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#if !defined (__GO32__)
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for (i = 0; i < count; i++)
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tputs (term_backspace, 1, _rl_output_character_function);
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#endif /* !__GO32__ */
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for (i = 0; i < count; i++)
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putc ('\b', _rl_out_stream);
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/* Move to the start of the next line. */
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#if defined (NEW_TTY_DRIVER)
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tputs (term_cr, 1, _rl_output_character_function);
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#endif /* NEW_TTY_DRIVER */
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putc ('\n', _rl_out_stream);
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/* Ring the terminal bell. */
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if (readline_echoing_p)
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#if !defined (__GO32__)
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switch (_rl_bell_preference)
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tputs (visible_bell, 1, _rl_output_character_function);
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fprintf (stderr, "\007");
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fprintf (stderr, "\007");
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#endif /* __GO32__ */
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/* **************************************************************** */
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/* Controlling the Meta Key and Keypad */
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/* **************************************************************** */
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_rl_enable_meta_key ()
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if (term_has_meta && term_mm)
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tputs (term_mm, 1, _rl_output_character_function);
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_rl_control_keypad (on)
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tputs (term_ks, 1, _rl_output_character_function);
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else if (!on && term_ke)
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tputs (term_ke, 1, _rl_output_character_function);
added
removed
readline-4.0/terminal.c
