freebsd-dev/contrib/libreadline/terminal.c

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1997-01-04 22:09:20 +00:00
/* 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"
#include "tcap.h"
#if defined (GWINSZ_IN_SYS_IOCTL)
# include <sys/ioctl.h>
#endif /* GWINSZ_IN_SYS_IOCTL */
/* 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;
/* **************************************************************** */
/* */
/* 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 this causes problems, add back the `extern'. */
/*extern*/ 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;
/* 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;
}
#if !defined (SHELL)
static void
set_lines_and_columns (lines, cols)
int lines, cols;
{
char *b;
#if defined (HAVE_PUTENV)
b = xmalloc (24);
sprintf (b, "LINES=%d", lines);
putenv (b);
b = xmalloc (24);
sprintf (b, "COLUMNS=%d", cols);
putenv (b);
#else /* !HAVE_PUTENV */
# if defined (HAVE_SETENV)
b = xmalloc (8);
sprintf (b, "%d", lines);
setenv ("LINES", b, 1);
b = xmalloc (8);
sprintf (b, "%d", cols);
setenv ("COLUMNS", b, 1);
# endif /* HAVE_SETENV */
#endif /* !HAVE_PUTENV */
}
#else /* SHELL */
extern void set_lines_and_columns ();
#endif /* SHELL */
/* 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 */
/* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
is unset. */
if (screenwidth <= 0)
{
if (ignore_env == 0 && (ss = getenv ("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 = getenv ("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 : getenv ("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);
}
/* A function for the use of tputs () */
int
_rl_output_character_function (c)
int c;
{
return putc (c, _rl_out_stream);
}
/* 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 */
/* */
/* **************************************************************** */
static int
outchar (c)
int c;
{
return putc (c, rl_outstream);
}
int
_rl_enable_meta_key ()
{
if (term_has_meta && term_mm)
tputs (term_mm, 1, outchar);
}
void
_rl_control_keypad (on)
int on;
{
if (on && term_ks)
tputs (term_ks, 1, outchar);
else if (!on && term_ke)
tputs (term_ke, 1, outchar);
}