1 /* terminal.c -- controlling the terminal with termcap. */
3 /* Copyright (C) 1996 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library, a library for
6 reading lines of text with interactive input and history editing.
8 The GNU Readline Library is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License
10 as published by the Free Software Foundation; either version 1, or
11 (at your option) any later version.
13 The GNU Readline Library is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 The GNU General Public License is often shipped with GNU software, and
19 is generally kept in a file called COPYING or LICENSE. If you do not
20 have a copy of the license, write to the Free Software Foundation,
21 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define READLINE_LIBRARY
24 #if defined (HAVE_CONFIG_H)
28 #include <sys/types.h>
29 #include "posixstat.h"
31 #if defined (HAVE_SYS_FILE_H)
32 # include <sys/file.h>
33 #endif /* HAVE_SYS_FILE_H */
35 #if defined (HAVE_UNISTD_H)
37 #endif /* HAVE_UNISTD_H */
39 #if defined (HAVE_STDLIB_H)
42 # include "ansi_stdlib.h"
43 #endif /* HAVE_STDLIB_H */
45 #if defined (HAVE_LOCALE_H)
53 /* System-specific feature definitions and include files. */
56 #if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
57 # include <sys/ioctl.h>
58 #endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
63 /* Some standard library routines. */
67 /* Variables and functions imported from readline.c */
68 extern FILE *_rl_in_stream, *_rl_out_stream;
69 extern int readline_echoing_p;
70 extern int _rl_bell_preference;
71 extern Keymap _rl_keymap;
73 /* Functions imported from bind.c */
74 extern void _rl_bind_if_unbound ();
76 /* Functions imported from shell.c */
77 extern void set_lines_and_columns ();
78 extern char *get_env_value ();
80 /* **************************************************************** */
82 /* Terminal and Termcap */
84 /* **************************************************************** */
86 static char *term_buffer = (char *)NULL;
87 static char *term_string_buffer = (char *)NULL;
89 static int tcap_initialized;
91 /* Non-zero means this terminal can't really do anything. */
94 #if !defined (__linux__)
95 # if defined (__EMX__) || defined (NEED_EXTERN_PC)
97 # endif /* __EMX__ || NEED_EXTERN_PC */
99 #endif /* __linux__ */
101 /* Some strings to control terminal actions. These are output by tputs (). */
102 char *term_goto, *term_clreol, *term_cr, *term_clrpag, *term_backspace;
105 /* Non-zero if we determine that the terminal can do character insertion. */
106 int terminal_can_insert = 0;
108 /* How to insert characters. */
109 char *term_im, *term_ei, *term_ic, *term_ip, *term_IC;
111 /* How to delete characters. */
112 char *term_dc, *term_DC;
114 #if defined (HACK_TERMCAP_MOTION)
115 char *term_forward_char;
116 #endif /* HACK_TERMCAP_MOTION */
118 /* How to go up a line. */
121 /* A visible bell, if the terminal can be made to flash the screen. */
122 static char *visible_bell;
124 /* Non-zero means the terminal can auto-wrap lines. */
125 int _rl_term_autowrap;
127 /* Non-zero means that this terminal has a meta key. */
128 static int term_has_meta;
130 /* The sequences to write to turn on and off the meta key, if this
132 static char *term_mm, *term_mo;
134 /* The key sequences output by the arrow keys, if this terminal has any. */
135 static char *term_ku, *term_kd, *term_kr, *term_kl;
137 /* How to initialize and reset the arrow keys, if this terminal has any. */
138 static char *term_ks, *term_ke;
140 /* The key sequences sent by the Home and End keys, if any. */
141 static char *term_kh, *term_kH;
143 /* Variables that hold the screen dimensions, used by the display code. */
144 int screenwidth, screenheight, screenchars;
146 /* Non-zero means the user wants to enable the keypad. */
147 int _rl_enable_keypad;
149 /* Non-zero means the user wants to enable a meta key. */
150 int _rl_enable_meta = 1;
152 /* Get readline's idea of the screen size. TTY is a file descriptor open
153 to the terminal. If IGNORE_ENV is true, we do not pay attention to the
154 values of $LINES and $COLUMNS. The tests for TERM_STRING_BUFFER being
155 non-null serve to check whether or not we have initialized termcap. */
157 _rl_get_screen_size (tty, ignore_env)
161 #if defined (TIOCGWINSZ)
162 struct winsize window_size;
163 #endif /* TIOCGWINSZ */
164 #if defined (__EMX__)
168 #if defined (TIOCGWINSZ)
169 if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
171 screenwidth = (int) window_size.ws_col;
172 screenheight = (int) window_size.ws_row;
174 #endif /* TIOCGWINSZ */
176 #if defined (__EMX__)
179 screenheight = sz[1];
182 /* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
184 if (screenwidth <= 0)
186 if (ignore_env == 0 && (ss = get_env_value ("COLUMNS")))
187 screenwidth = atoi (ss);
189 #if !defined(__DJGPP__)
190 if (screenwidth <= 0 && term_string_buffer)
191 screenwidth = tgetnum ("co");
195 /* Environment variable LINES overrides setting of "li" if IGNORE_ENV
197 if (screenheight <= 0)
199 if (ignore_env == 0 && (ss = get_env_value ("LINES")))
200 screenheight = atoi (ss);
202 #if !defined(__DJGPP__)
203 if (screenheight <= 0 && term_string_buffer)
204 screenheight = tgetnum ("li");
208 /* If all else fails, default to 80x24 terminal. */
209 if (screenwidth <= 1)
212 if (screenheight <= 0)
215 /* If we're being compiled as part of bash, set the environment
216 variables $LINES and $COLUMNS to new values. Otherwise, just
217 do a pair of putenv () or setenv () calls. */
218 set_lines_and_columns (screenheight, screenwidth);
220 if (!_rl_term_autowrap)
223 screenchars = screenwidth * screenheight;
227 _rl_set_screen_size (rows, cols)
233 if (_rl_term_autowrap == 0)
236 screenchars = screenwidth * screenheight;
240 rl_resize_terminal ()
242 if (readline_echoing_p)
244 _rl_get_screen_size (fileno (rl_instream), 1);
245 _rl_redisplay_after_sigwinch ();
254 /* This should be kept sorted, just in case we decide to change the
255 search algorithm to something smarter. */
256 static struct _tc_string tc_strings[] =
268 "kh", &term_kh, /* home */
269 "kH", &term_kH, /* end */
275 "le", &term_backspace,
278 #if defined (HACK_TERMCAP_MOTION)
279 "nd", &term_forward_char,
286 #define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))
288 /* Read the desired terminal capability strings into BP. The capabilities
289 are described in the TC_STRINGS table. */
291 get_term_capabilities (bp)
294 #if !defined(__DJGPP__)
297 for (i = 0; i < NUM_TC_STRINGS; i++)
298 *(tc_strings[i].tc_value) = tgetstr (tc_strings[i].tc_var, bp);
300 tcap_initialized = 1;
304 _rl_init_terminal_io (terminal_name)
307 #if defined (__GO32__)
308 screenwidth = ScreenCols ();
309 screenheight = ScreenRows ();
310 screenchars = screenwidth * screenheight;
312 term_im = term_ei = term_ic = term_IC = (char *)NULL;
313 term_up = term_dc = term_DC = visible_bell = (char *)NULL;
315 /* Does the __GO32__ have a meta key? I don't know. */
317 term_mm = term_mo = (char *)NULL;
319 /* It probably has arrow keys, but I don't know what they are. */
320 term_ku = term_kd = term_kr = term_kl = (char *)NULL;
322 #if defined (HACK_TERMCAP_MOTION)
323 term_forward_char = (char *)NULL;
324 #endif /* HACK_TERMCAP_MOTION */
325 terminal_can_insert = _rl_term_autowrap = 0;
327 #else /* !__GO32__ */
333 term = terminal_name ? terminal_name : get_env_value ("TERM");
335 if (term_string_buffer == 0)
336 term_string_buffer = xmalloc (2032);
338 if (term_buffer == 0)
339 term_buffer = xmalloc (4080);
341 buffer = term_string_buffer;
343 term_clrpag = term_cr = term_clreol = (char *)NULL;
348 if (tgetent (term_buffer, term) <= 0)
353 screenchars = 79 * 24;
355 term_im = term_ei = term_ic = term_IC = (char *)NULL;
356 term_up = term_dc = term_DC = visible_bell = (char *)NULL;
357 term_ku = term_kd = term_kl = term_kr = (char *)NULL;
358 #if defined (HACK_TERMCAP_MOTION)
359 term_forward_char = (char *)NULL;
361 terminal_can_insert = 0;
365 get_term_capabilities (&buffer);
367 /* Set up the variables that the termcap library expects the application
369 PC = term_pc ? *term_pc : 0;
376 tty = rl_instream ? fileno (rl_instream) : 0;
378 screenwidth = screenheight = 0;
380 _rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");
382 _rl_get_screen_size (tty, 0);
384 /* "An application program can assume that the terminal can do
385 character insertion if *any one of* the capabilities `IC',
386 `im', `ic' or `ip' is provided." But we can't do anything if
387 only `ip' is provided, so... */
388 terminal_can_insert = (term_IC || term_im || term_ic);
390 /* Check to see if this terminal has a meta key and clear the capability
391 variables if there is none. */
392 term_has_meta = (tgetflag ("km") || tgetflag ("MT"));
394 term_mm = term_mo = (char *)NULL;
396 /* Attempt to find and bind the arrow keys. Do not override already
397 bound keys in an overzealous attempt, however. */
398 xkeymap = _rl_keymap;
400 _rl_keymap = emacs_standard_keymap;
401 _rl_bind_if_unbound (term_ku, rl_get_previous_history);
402 _rl_bind_if_unbound (term_kd, rl_get_next_history);
403 _rl_bind_if_unbound (term_kr, rl_forward);
404 _rl_bind_if_unbound (term_kl, rl_backward);
406 _rl_bind_if_unbound (term_kh, rl_beg_of_line); /* Home */
407 _rl_bind_if_unbound (term_kH, rl_end_of_line); /* End */
409 #if defined (VI_MODE)
410 _rl_keymap = vi_movement_keymap;
411 _rl_bind_if_unbound (term_ku, rl_get_previous_history);
412 _rl_bind_if_unbound (term_kd, rl_get_next_history);
413 _rl_bind_if_unbound (term_kr, rl_forward);
414 _rl_bind_if_unbound (term_kl, rl_backward);
416 _rl_bind_if_unbound (term_kh, rl_beg_of_line); /* Home */
417 _rl_bind_if_unbound (term_kH, rl_end_of_line); /* End */
420 _rl_keymap = xkeymap;
422 #endif /* !__GO32__ */
432 if (tcap_initialized == 0)
433 return ((char *)NULL);
434 for (i = 0; i < NUM_TC_STRINGS; i++)
436 if (tc_strings[i].tc_var[0] == cap[0] && strcmp (tc_strings[i].tc_var, cap) == 0)
437 return *(tc_strings[i].tc_value);
439 return ((char *)NULL);
442 /* Re-initialize the terminal considering that the TERM/TERMCAP variable
445 rl_reset_terminal (terminal_name)
448 _rl_init_terminal_io (terminal_name);
452 /* A function for the use of tputs () */
455 _rl_output_character_function (c)
458 putc (c, _rl_out_stream);
462 _rl_output_character_function (c)
465 return putc (c, _rl_out_stream);
468 /* Write COUNT characters from STRING to the output stream. */
470 _rl_output_some_chars (string, count)
474 fwrite (string, 1, count, _rl_out_stream);
477 /* Move the cursor back. */
479 _rl_backspace (count)
484 #if !defined (__GO32__)
486 for (i = 0; i < count; i++)
487 tputs (term_backspace, 1, _rl_output_character_function);
489 #endif /* !__GO32__ */
490 for (i = 0; i < count; i++)
491 putc ('\b', _rl_out_stream);
495 /* Move to the start of the next line. */
499 #if defined (NEW_TTY_DRIVER)
501 tputs (term_cr, 1, _rl_output_character_function);
502 #endif /* NEW_TTY_DRIVER */
503 putc ('\n', _rl_out_stream);
507 /* Ring the terminal bell. */
511 if (readline_echoing_p)
513 #if !defined (__GO32__)
514 switch (_rl_bell_preference)
522 tputs (visible_bell, 1, _rl_output_character_function);
527 fprintf (stderr, "\007");
532 fprintf (stderr, "\007");
534 #endif /* __GO32__ */
540 /* **************************************************************** */
542 /* Controlling the Meta Key and Keypad */
544 /* **************************************************************** */
547 _rl_enable_meta_key ()
549 #if !defined(__DJGPP__)
550 if (term_has_meta && term_mm)
551 tputs (term_mm, 1, _rl_output_character_function);
556 _rl_control_keypad (on)
559 #if !defined(__DJGPP__)
561 tputs (term_ks, 1, _rl_output_character_function);
562 else if (!on && term_ke)
563 tputs (term_ke, 1, _rl_output_character_function);