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-rw-r--r--readline/terminal.c545
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+/* 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;
+}
+
+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, "\007");
+ fflush (stderr);
+ break;
+ }
+#else /* __GO32__ */
+ fprintf (stderr, "\007");
+ 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);
+}