terminal.c
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上传日期:2007-04-14
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文件大小:14k
- /* 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 1, 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,
- 675 Mass Ave, Cambridge, MA 02139, 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 <signal.h>
- #include <stdio.h>
- #include <setjmp.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"
- /* Variables and functions imported from readline.c */
- extern FILE *_rl_in_stream, *_rl_out_stream;
- extern int readline_echoing_p;
- extern int _rl_bell_preference;
- extern Keymap _rl_keymap;
- /* Functions imported from bind.c */
- extern void _rl_bind_if_unbound ();
- /* Functions imported from shell.c */
- extern void set_lines_and_columns ();
- extern char *get_env_value ();
- /* **************************************************************** */
- /* */
- /* 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;
- /* 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 (__EMX__)
- int sz[2];
- #endif
- #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__)
- _scrsize (sz);
- screenwidth = sz[0];
- screenheight = sz[1];
- #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 (screenwidth <= 0 && term_string_buffer)
- screenwidth = tgetnum ("co");
- }
- /* 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 (screenheight <= 0 && term_string_buffer)
- screenheight = tgetnum ("li");
- }
- /* 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)
- 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;
- }
- extern void _rl_redisplay_after_sigwinch();
- 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},
- {"vb", &visible_bell},
- };
- #define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))
- /* Read the desired terminal capability strings into BP. The capabilities
- are described in the TC_STRINGS table. */
- static void
- get_term_capabilities (bp)
- char **bp;
- {
- register int i;
- for (i = 0; i < NUM_TC_STRINGS; i++)
- *(tc_strings[i].tc_value) = tgetstr (tc_strings[i].tc_var, bp);
- tcap_initialized = 1;
- }
- int
- _rl_init_terminal_io (terminal_name)
- char *terminal_name;
- {
- #if defined (__GO32__)
- screenwidth = ScreenCols ();
- screenheight = ScreenRows ();
- screenchars = screenwidth * screenheight;
- term_cr = "r";
- term_im = term_ei = term_ic = term_IC = (char *)NULL;
- term_up = term_dc = term_DC = visible_bell = (char *)NULL;
- /* Does the __GO32__ have a meta key? I don't know. */
- term_has_meta = 0;
- term_mm = term_mo = (char *)NULL;
- /* It probably has arrow keys, but I don't know what they are. */
- term_ku = term_kd = term_kr = term_kl = (char *)NULL;
- #if defined (HACK_TERMCAP_MOTION)
- term_forward_char = (char *)NULL;
- #endif /* HACK_TERMCAP_MOTION */
- terminal_can_insert = _rl_term_autowrap = 0;
- return;
- #else /* !__GO32__ */
- char *term, *buffer;
- int tty;
- Keymap xkeymap;
- term = terminal_name ? terminal_name : get_env_value ("TERM");
- if (term_string_buffer == 0)
- term_string_buffer = xmalloc (2032);
- if (term_buffer == 0)
- term_buffer = xmalloc (4080);
- buffer = term_string_buffer;
- term_clrpag = term_cr = term_clreol = (char *)NULL;
- if (term == 0)
- term = "dumb";
- if (tgetent (term_buffer, term) <= 0)
- {
- dumb_term = 1;
- screenwidth = 79;
- screenheight = 24;
- screenchars = 79 * 24;
- term_cr = "r";
- term_im = term_ei = term_ic = term_IC = (char *)NULL;
- term_up = term_dc = term_DC = visible_bell = (char *)NULL;
- term_ku = term_kd = term_kl = term_kr = (char *)NULL;
- #if defined (HACK_TERMCAP_MOTION)
- term_forward_char = (char *)NULL;
- #endif
- terminal_can_insert = 0;
- return 0;
- }
- get_term_capabilities (&buffer);
- /* Set up the variables that the termcap library expects the application
- to provide. */
- PC = term_pc ? *term_pc : 0;
- BC = term_backspace;
- UP = term_up;
- if (!term_cr)
- term_cr = "r";
- tty = rl_instream ? fileno (rl_instream) : 0;
- screenwidth = screenheight = 0;
- _rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");
- _rl_get_screen_size (tty, 0);
- /* "An application program can assume that the terminal can do
- character insertion if *any one of* the capabilities `IC',
- `im', `ic' or `ip' is provided." But we can't do anything if
- only `ip' is provided, so... */
- terminal_can_insert = (term_IC || term_im || term_ic);
- /* Check to see if this terminal has a meta key and clear the capability
- variables if there is none. */
- term_has_meta = (tgetflag ("km") || tgetflag ("MT"));
- if (!term_has_meta)
- term_mm = term_mo = (char *)NULL;
- /* Attempt to find and bind the arrow keys. Do not override already
- bound keys in an overzealous attempt, however. */
- xkeymap = _rl_keymap;
- _rl_keymap = emacs_standard_keymap;
- _rl_bind_if_unbound (term_ku, rl_get_previous_history);
- _rl_bind_if_unbound (term_kd, rl_get_next_history);
- _rl_bind_if_unbound (term_kr, rl_forward);
- _rl_bind_if_unbound (term_kl, rl_backward);
- _rl_bind_if_unbound (term_kh, rl_beg_of_line); /* Home */
- _rl_bind_if_unbound (term_kH, rl_end_of_line); /* End */
- #if defined (VI_MODE)
- _rl_keymap = vi_movement_keymap;
- _rl_bind_if_unbound (term_ku, rl_get_previous_history);
- _rl_bind_if_unbound (term_kd, rl_get_next_history);
- _rl_bind_if_unbound (term_kr, rl_forward);
- _rl_bind_if_unbound (term_kl, rl_backward);
- _rl_bind_if_unbound (term_kh, rl_beg_of_line); /* Home */
- _rl_bind_if_unbound (term_kH, rl_end_of_line); /* End */
- #endif /* VI_MODE */
- _rl_keymap = xkeymap;
- #endif /* !__GO32__ */
- return 0;
- }
- char *
- rl_get_termcap (cap)
- char *cap;
- {
- register int i;
- if (tcap_initialized == 0)
- return ((char *)NULL);
- for (i = 0; i < NUM_TC_STRINGS; i++)
- {
- 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)
- 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)
- 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 !defined (__GO32__)
- if (term_backspace)
- for (i = 0; i < count; i++)
- tputs (term_backspace, 1, _rl_output_character_function);
- else
- #endif /* !__GO32__ */
- for (i = 0; i < count; i++)
- putc ('b', _rl_out_stream);
- return 0;
- }
- /* Move to the start of the next line. */
- int
- crlf ()
- {
- #if defined (NEW_TTY_DRIVER)
- if (term_cr)
- tputs (term_cr, 1, _rl_output_character_function);
- #endif /* NEW_TTY_DRIVER */
- putc ('n', _rl_out_stream);
- return 0;
- }
- /* Ring the terminal bell. */
- int
- ding ()
- {
- if (readline_echoing_p)
- {
- #if !defined (__GO32__)
- switch (_rl_bell_preference)
- {
- case NO_BELL:
- default:
- break;
- case VISIBLE_BELL:
- if (visible_bell)
- {
- tputs (visible_bell, 1, _rl_output_character_function);
- break;
- }
- /* FALLTHROUGH */
- case AUDIBLE_BELL:
- fprintf (stderr, "07");
- fflush (stderr);
- break;
- }
- #else /* __GO32__ */
- fprintf (stderr, "07");
- fflush (stderr);
- #endif /* __GO32__ */
- return (0);
- }
- return (-1);
- }
- /* **************************************************************** */
- /* */
- /* Controlling the Meta Key and Keypad */
- /* */
- /* **************************************************************** */
- void
- _rl_enable_meta_key ()
- {
- if (term_has_meta && term_mm)
- tputs (term_mm, 1, _rl_output_character_function);
- }
- void
- _rl_control_keypad (on)
- int on;
- {
- if (on && term_ks)
- tputs (term_ks, 1, _rl_output_character_function);
- else if (!on && term_ke)
- tputs (term_ke, 1, _rl_output_character_function);
- }