659 lines
17 KiB
C
659 lines
17 KiB
C
/* 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 2, 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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59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include "posixstat.h"
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#include <fcntl.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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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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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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# include <locale.h>
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#endif
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#include <stdio.h>
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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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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#include "rltty.h"
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#include "tcap.h"
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/* Some standard library routines. */
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#include "readline.h"
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#include "history.h"
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#include "rlprivate.h"
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#include "rlshell.h"
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#include "xmalloc.h"
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#define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)
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#define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)
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/* **************************************************************** */
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/* */
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/* Terminal and Termcap */
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/* */
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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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#if !defined (__linux__)
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# if defined (__EMX__) || defined (NEED_EXTERN_PC)
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extern
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# endif /* __EMX__ || NEED_EXTERN_PC */
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char PC, *BC, *UP;
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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 *_rl_term_clreol;
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char *_rl_term_clrpag;
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char *_rl_term_cr;
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char *_rl_term_backspace;
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char *_rl_term_goto;
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char *_rl_term_pc;
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/* Non-zero if we determine that the terminal can do character insertion. */
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int _rl_terminal_can_insert = 0;
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/* How to insert characters. */
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char *_rl_term_im;
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char *_rl_term_ei;
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char *_rl_term_ic;
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char *_rl_term_ip;
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char *_rl_term_IC;
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/* How to delete characters. */
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char *_rl_term_dc;
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char *_rl_term_DC;
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#if defined (HACK_TERMCAP_MOTION)
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char *_rl_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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char *_rl_term_up;
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/* A visible bell; char if the terminal can be made to flash the screen. */
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static char *_rl_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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terminal has one. */
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static char *_rl_term_mm;
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static char *_rl_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 *_rl_term_ku;
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static char *_rl_term_kd;
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static char *_rl_term_kr;
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static char *_rl_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 *_rl_term_ks;
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static char *_rl_term_ke;
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/* The key sequences sent by the Home and End keys, if any. */
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static char *_rl_term_kh;
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static char *_rl_term_kH;
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static char *_rl_term_at7; /* @7 */
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/* Insert key */
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static char *_rl_term_kI;
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/* Cursor control */
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static char *_rl_term_vs; /* very visible */
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static char *_rl_term_ve; /* normal */
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static void bind_termcap_arrow_keys PARAMS((Keymap));
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/* Variables that hold the screen dimensions, used by the display code. */
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int _rl_screenwidth, _rl_screenheight, _rl_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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#if defined (__EMX__)
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static void
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_emx_get_screensize (swp, shp)
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int *swp, *shp;
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{
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int sz[2];
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_scrsize (sz);
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if (swp)
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*swp = sz[0];
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if (shp)
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*shp = sz[1];
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}
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#endif
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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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void
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_rl_get_screen_size (tty, ignore_env)
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int tty, ignore_env;
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{
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char *ss;
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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 (TIOCGWINSZ)
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if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
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{
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_rl_screenwidth = (int) window_size.ws_col;
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_rl_screenheight = (int) window_size.ws_row;
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}
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#endif /* TIOCGWINSZ */
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#if defined (__EMX__)
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_emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
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#endif
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/* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
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is unset. */
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if (_rl_screenwidth <= 0)
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{
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if (ignore_env == 0 && (ss = sh_get_env_value ("COLUMNS")))
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_rl_screenwidth = atoi (ss);
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#if !defined (__DJGPP__)
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if (_rl_screenwidth <= 0 && term_string_buffer)
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_rl_screenwidth = tgetnum ("co");
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#endif
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}
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/* Environment variable LINES overrides setting of "li" if IGNORE_ENV
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is unset. */
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if (_rl_screenheight <= 0)
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{
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if (ignore_env == 0 && (ss = sh_get_env_value ("LINES")))
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_rl_screenheight = atoi (ss);
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#if !defined (__DJGPP__)
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if (_rl_screenheight <= 0 && term_string_buffer)
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_rl_screenheight = tgetnum ("li");
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#endif
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}
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/* If all else fails, default to 80x24 terminal. */
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if (_rl_screenwidth <= 1)
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_rl_screenwidth = 80;
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if (_rl_screenheight <= 0)
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_rl_screenheight = 24;
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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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sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);
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if (_rl_term_autowrap == 0)
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_rl_screenwidth--;
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_rl_screenchars = _rl_screenwidth * _rl_screenheight;
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}
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void
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_rl_set_screen_size (rows, cols)
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int rows, cols;
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{
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if (rows == 0 || cols == 0)
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return;
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_rl_screenheight = rows;
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_rl_screenwidth = cols;
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if (_rl_term_autowrap == 0)
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_rl_screenwidth--;
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_rl_screenchars = _rl_screenwidth * _rl_screenheight;
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}
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void
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rl_set_screen_size (rows, cols)
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int rows, cols;
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{
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_rl_set_screen_size (rows, cols);
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}
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void
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rl_get_screen_size (rows, cols)
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int *rows, *cols;
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{
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if (rows)
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*rows = _rl_screenheight;
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if (cols)
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*cols = _rl_screenwidth;
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}
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void
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rl_resize_terminal ()
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{
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if (readline_echoing_p)
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{
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_rl_get_screen_size (fileno (rl_instream), 1);
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if (CUSTOM_REDISPLAY_FUNC ())
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rl_forced_update_display ();
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else
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_rl_redisplay_after_sigwinch ();
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}
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}
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struct _tc_string {
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const char *tc_var;
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char **tc_value;
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};
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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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{
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{ "@7", &_rl_term_at7 },
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{ "DC", &_rl_term_DC },
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{ "IC", &_rl_term_IC },
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{ "ce", &_rl_term_clreol },
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{ "cl", &_rl_term_clrpag },
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{ "cr", &_rl_term_cr },
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{ "dc", &_rl_term_dc },
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{ "ei", &_rl_term_ei },
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{ "ic", &_rl_term_ic },
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{ "im", &_rl_term_im },
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{ "kH", &_rl_term_kH }, /* home down ?? */
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{ "kI", &_rl_term_kI }, /* insert */
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{ "kd", &_rl_term_kd },
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{ "ke", &_rl_term_ke }, /* end keypad mode */
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{ "kh", &_rl_term_kh }, /* home */
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{ "kl", &_rl_term_kl },
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{ "kr", &_rl_term_kr },
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{ "ks", &_rl_term_ks }, /* start keypad mode */
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{ "ku", &_rl_term_ku },
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{ "le", &_rl_term_backspace },
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{ "mm", &_rl_term_mm },
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{ "mo", &_rl_term_mo },
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#if defined (HACK_TERMCAP_MOTION)
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{ "nd", &_rl_term_forward_char },
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#endif
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{ "pc", &_rl_term_pc },
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{ "up", &_rl_term_up },
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{ "vb", &_rl_visible_bell },
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{ "vs", &_rl_term_vs },
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{ "ve", &_rl_term_ve },
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};
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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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static void
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get_term_capabilities (bp)
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char **bp;
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{
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#if !defined (__DJGPP__) /* XXX - doesn't DJGPP have a termcap library? */
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register int i;
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for (i = 0; i < NUM_TC_STRINGS; i++)
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*(tc_strings[i].tc_value) = tgetstr ((char *)tc_strings[i].tc_var, bp);
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#endif
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tcap_initialized = 1;
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}
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int
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_rl_init_terminal_io (terminal_name)
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const char *terminal_name;
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{
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const char *term;
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char *buffer;
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int tty, tgetent_ret;
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term = terminal_name ? terminal_name : sh_get_env_value ("TERM");
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_rl_term_clrpag = _rl_term_cr = _rl_term_clreol = (char *)NULL;
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tty = rl_instream ? fileno (rl_instream) : 0;
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_rl_screenwidth = _rl_screenheight = 0;
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if (term == 0)
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term = "dumb";
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/* I've separated this out for later work on not calling tgetent at all
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if the calling application has supplied a custom redisplay function,
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(and possibly if the application has supplied a custom input function). */
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if (CUSTOM_REDISPLAY_FUNC())
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{
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tgetent_ret = -1;
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}
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else
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{
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if (term_string_buffer == 0)
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term_string_buffer = (char *)xmalloc(2032);
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if (term_buffer == 0)
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term_buffer = (char *)xmalloc(4080);
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buffer = term_string_buffer;
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tgetent_ret = tgetent (term_buffer, term);
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}
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if (tgetent_ret <= 0)
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{
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FREE (term_string_buffer);
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FREE (term_buffer);
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buffer = term_buffer = term_string_buffer = (char *)NULL;
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_rl_term_autowrap = 0; /* used by _rl_get_screen_size */
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#if defined (__EMX__)
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_emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
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_rl_screenwidth--;
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#else /* !__EMX__ */
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_rl_get_screen_size (tty, 0);
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#endif /* !__EMX__ */
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/* Defaults. */
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if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
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{
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_rl_screenwidth = 79;
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_rl_screenheight = 24;
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}
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/* Everything below here is used by the redisplay code (tputs). */
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_rl_screenchars = _rl_screenwidth * _rl_screenheight;
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_rl_term_cr = "\r";
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_rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;
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_rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;
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_rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;
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_rl_term_kh = _rl_term_kH = _rl_term_kI = (char *)NULL;
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_rl_term_ks = _rl_term_ke = _rl_term_at7 = (char *)NULL;
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_rl_term_mm = _rl_term_mo = (char *)NULL;
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_rl_term_ve = _rl_term_vs = (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
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_rl_terminal_can_insert = term_has_meta = 0;
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/* Reasonable defaults for tgoto(). Readline currently only uses
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tgoto if _rl_term_IC or _rl_term_DC is defined, but just in case we
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change that later... */
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PC = '\0';
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BC = _rl_term_backspace = "\b";
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UP = _rl_term_up;
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return 0;
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}
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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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to provide. */
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PC = _rl_term_pc ? *_rl_term_pc : 0;
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BC = _rl_term_backspace;
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UP = _rl_term_up;
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if (!_rl_term_cr)
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_rl_term_cr = "\r";
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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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_rl_terminal_can_insert = (_rl_term_IC || _rl_term_im || _rl_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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if (!term_has_meta)
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_rl_term_mm = _rl_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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bind_termcap_arrow_keys (emacs_standard_keymap);
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#if defined (VI_MODE)
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bind_termcap_arrow_keys (vi_movement_keymap);
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bind_termcap_arrow_keys (vi_insertion_keymap);
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#endif /* VI_MODE */
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return 0;
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}
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/* Bind the arrow key sequences from the termcap description in MAP. */
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static void
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bind_termcap_arrow_keys (map)
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Keymap map;
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{
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Keymap xkeymap;
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xkeymap = _rl_keymap;
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_rl_keymap = map;
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rl_bind_keyseq_if_unbound (_rl_term_ku, rl_get_previous_history);
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rl_bind_keyseq_if_unbound (_rl_term_kd, rl_get_next_history);
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rl_bind_keyseq_if_unbound (_rl_term_kr, rl_forward_char);
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rl_bind_keyseq_if_unbound (_rl_term_kl, rl_backward_char);
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rl_bind_keyseq_if_unbound (_rl_term_kh, rl_beg_of_line); /* Home */
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rl_bind_keyseq_if_unbound (_rl_term_at7, rl_end_of_line); /* End */
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_rl_keymap = xkeymap;
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}
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char *
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rl_get_termcap (cap)
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const char *cap;
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{
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register int i;
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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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{
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|
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_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;
|
|
|
|
if (_rl_term_backspace)
|
|
for (i = 0; i < count; i++)
|
|
tputs (_rl_term_backspace, 1, _rl_output_character_function);
|
|
else
|
|
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:
|
|
if (_rl_visible_bell)
|
|
{
|
|
tputs (_rl_visible_bell, 1, _rl_output_character_function);
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case AUDIBLE_BELL:
|
|
fprintf (stderr, "\007");
|
|
fflush (stderr);
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* Controlling the Meta Key and Keypad */
|
|
/* */
|
|
/* **************************************************************** */
|
|
|
|
void
|
|
_rl_enable_meta_key ()
|
|
{
|
|
#if !defined (__DJGPP__)
|
|
if (term_has_meta && _rl_term_mm)
|
|
tputs (_rl_term_mm, 1, _rl_output_character_function);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
_rl_control_keypad (on)
|
|
int on;
|
|
{
|
|
#if !defined (__DJGPP__)
|
|
if (on && _rl_term_ks)
|
|
tputs (_rl_term_ks, 1, _rl_output_character_function);
|
|
else if (!on && _rl_term_ke)
|
|
tputs (_rl_term_ke, 1, _rl_output_character_function);
|
|
#endif
|
|
}
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* Controlling the Cursor */
|
|
/* */
|
|
/* **************************************************************** */
|
|
|
|
/* Set the cursor appropriately depending on IM, which is one of the
|
|
insert modes (insert or overwrite). Insert mode gets the normal
|
|
cursor. Overwrite mode gets a very visible cursor. Only does
|
|
anything if we have both capabilities. */
|
|
void
|
|
_rl_set_cursor (im, force)
|
|
int im, force;
|
|
{
|
|
if (_rl_term_ve && _rl_term_vs)
|
|
{
|
|
if (force || im != rl_insert_mode)
|
|
{
|
|
if (im == RL_IM_OVERWRITE)
|
|
tputs (_rl_term_vs, 1, _rl_output_character_function);
|
|
else
|
|
tputs (_rl_term_ve, 1, _rl_output_character_function);
|
|
}
|
|
}
|
|
}
|