1 /* terminal.c -- controlling the terminal with termcap. */
3 /* Copyright (C) 1996-2009 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library (Readline), a library
6 for reading lines of text with interactive input and history editing.
8 Readline is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Readline is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Readline. If not, see <http://www.gnu.org/licenses/>.
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)
51 /* System-specific feature definitions and include files. */
54 #if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
55 # include <sys/ioctl.h>
56 #endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
65 /* Some standard library routines. */
69 #include "rlprivate.h"
73 #if defined (__MINGW32__)
77 static void _win_get_screensize PARAMS((int *, int *));
81 static void _emx_get_screensize PARAMS((int *, int *));
84 #if defined (__MINGW32__)
89 #define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)
90 #define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)
92 /* If the calling application sets this to a non-zero value, readline will
93 use the $LINES and $COLUMNS environment variables to set its idea of the
94 window size before interrogating the kernel. */
95 int rl_prefer_env_winsize = 0;
97 /* **************************************************************** */
99 /* Terminal and Termcap */
101 /* **************************************************************** */
104 static char *term_buffer = (char *)NULL;
105 static char *term_string_buffer = (char *)NULL;
106 #endif /* !__MSDOS__ */
108 static int tcap_initialized;
110 #if !defined (__linux__) && !defined (NCURSES_VERSION)
111 # if defined (__EMX__) || defined (NEED_EXTERN_PC)
113 # endif /* __EMX__ || NEED_EXTERN_PC */
115 #endif /* !__linux__ && !NCURSES_VERSION */
117 /* Some strings to control terminal actions. These are output by tputs (). */
118 char *_rl_term_clreol;
119 char *_rl_term_clrpag;
121 char *_rl_term_backspace;
125 /* Non-zero if we determine that the terminal can do character insertion. */
126 int _rl_terminal_can_insert = 0;
128 /* How to insert characters. */
135 /* How to delete characters. */
139 char *_rl_term_forward_char;
141 /* How to go up a line. */
144 /* A visible bell; char if the terminal can be made to flash the screen. */
145 static char *_rl_visible_bell;
147 /* Non-zero means the terminal can auto-wrap lines. */
148 int _rl_term_autowrap = -1;
150 /* Non-zero means that this terminal has a meta key. */
151 static int term_has_meta;
153 /* The sequences to write to turn on and off the meta key, if this
155 static char *_rl_term_mm;
156 static char *_rl_term_mo;
158 /* The key sequences output by the arrow keys, if this terminal has any. */
159 static char *_rl_term_ku;
160 static char *_rl_term_kd;
161 static char *_rl_term_kr;
162 static char *_rl_term_kl;
164 /* How to initialize and reset the arrow keys, if this terminal has any. */
165 static char *_rl_term_ks;
166 static char *_rl_term_ke;
168 /* The key sequences sent by the Home and End keys, if any. */
169 static char *_rl_term_kh;
170 static char *_rl_term_kH;
171 static char *_rl_term_at7; /* @7 */
174 static char *_rl_term_kD;
177 static char *_rl_term_kI;
180 static char *_rl_term_vs; /* very visible */
181 static char *_rl_term_ve; /* normal */
183 static void bind_termcap_arrow_keys PARAMS((Keymap));
185 /* Variables that hold the screen dimensions, used by the display code. */
186 int _rl_screenwidth, _rl_screenheight, _rl_screenchars;
188 /* Non-zero means the user wants to enable the keypad. */
189 int _rl_enable_keypad;
191 /* Non-zero means the user wants to enable a meta key. */
192 int _rl_enable_meta = 1;
194 #if defined (__EMX__)
196 _emx_get_screensize (swp, shp)
210 #if defined (__MINGW32__)
212 _win_get_screensize (swp, shp)
216 CONSOLE_SCREEN_BUFFER_INFO scr;
218 hConOut = GetStdHandle (STD_OUTPUT_HANDLE);
219 if (hConOut != INVALID_HANDLE_VALUE)
221 if (GetConsoleScreenBufferInfo (hConOut, &scr))
224 *shp = scr.srWindow.Bottom - scr.srWindow.Top + 1;
230 /* Get readline's idea of the screen size. TTY is a file descriptor open
231 to the terminal. If IGNORE_ENV is true, we do not pay attention to the
232 values of $LINES and $COLUMNS. The tests for TERM_STRING_BUFFER being
233 non-null serve to check whether or not we have initialized termcap. */
235 _rl_get_screen_size (tty, ignore_env)
239 #if defined (TIOCGWINSZ)
240 struct winsize window_size;
241 #endif /* TIOCGWINSZ */
245 #if defined (TIOCGWINSZ)
246 if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
248 wc = (int) window_size.ws_col;
249 wr = (int) window_size.ws_row;
251 #endif /* TIOCGWINSZ */
253 /* For MinGW, we get the console size from the Windows API. */
254 #if defined (__MINGW32__)
255 HANDLE hConOut = GetStdHandle (STD_OUTPUT_HANDLE);
256 if (hConOut != INVALID_HANDLE_VALUE)
258 CONSOLE_SCREEN_BUFFER_INFO scr;
259 if (GetConsoleScreenBufferInfo (hConOut, &scr))
262 wr = scr.srWindow.Bottom - scr.srWindow.Top + 1;
267 #if defined (__EMX__)
268 _emx_get_screensize (&wc, &wr);
269 #elif defined (__MINGW32__)
270 _win_get_screensize (&wc, &wr);
273 if (ignore_env || rl_prefer_env_winsize == 0)
275 _rl_screenwidth = wc;
276 _rl_screenheight = wr;
279 _rl_screenwidth = _rl_screenheight = -1;
281 /* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
282 is unset. If we prefer the environment, check it first before
283 assigning the value returned by the kernel. */
284 if (_rl_screenwidth <= 0)
286 if (ignore_env == 0 && (ss = sh_get_env_value ("COLUMNS")))
287 _rl_screenwidth = atoi (ss);
289 if (_rl_screenwidth <= 0)
290 _rl_screenwidth = wc;
292 #if defined (__DJGPP__)
293 if (_rl_screenwidth <= 0)
294 _rl_screenwidth = ScreenCols ();
296 if (_rl_screenwidth <= 0 && term_string_buffer)
297 _rl_screenwidth = tgetnum ("co");
301 /* Environment variable LINES overrides setting of "li" if IGNORE_ENV
303 if (_rl_screenheight <= 0)
305 if (ignore_env == 0 && (ss = sh_get_env_value ("LINES")))
306 _rl_screenheight = atoi (ss);
308 if (_rl_screenheight <= 0)
309 _rl_screenheight = wr;
311 #if defined (__DJGPP__)
312 if (_rl_screenheight <= 0)
313 _rl_screenheight = ScreenRows ();
315 if (_rl_screenheight <= 0 && term_string_buffer)
316 _rl_screenheight = tgetnum ("li");
320 /* If all else fails, default to 80x24 terminal. */
321 if (_rl_screenwidth <= 1)
322 _rl_screenwidth = 80;
324 if (_rl_screenheight <= 0)
325 _rl_screenheight = 24;
327 /* If we're being compiled as part of bash, set the environment
328 variables $LINES and $COLUMNS to new values. Otherwise, just
329 do a pair of putenv () or setenv () calls. */
330 sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);
332 if (_rl_term_autowrap == 0)
335 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
339 _rl_set_screen_size (rows, cols)
342 if (_rl_term_autowrap == -1)
343 _rl_init_terminal_io (rl_terminal_name);
346 _rl_screenheight = rows;
349 _rl_screenwidth = cols;
350 if (_rl_term_autowrap == 0)
354 if (rows > 0 || cols > 0)
355 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
359 rl_set_screen_size (rows, cols)
362 _rl_set_screen_size (rows, cols);
366 rl_get_screen_size (rows, cols)
370 *rows = _rl_screenheight;
372 *cols = _rl_screenwidth;
376 rl_reset_screen_size ()
378 _rl_get_screen_size (fileno (rl_instream), 0);
382 rl_resize_terminal ()
384 _rl_get_screen_size (fileno (rl_instream), 1);
387 if (CUSTOM_REDISPLAY_FUNC ())
388 rl_forced_update_display ();
389 else if (RL_ISSTATE(RL_STATE_REDISPLAYING) == 0)
390 _rl_redisplay_after_sigwinch ();
395 const char * const tc_var;
399 /* This should be kept sorted, just in case we decide to change the
400 search algorithm to something smarter. */
401 static const struct _tc_string tc_strings[] =
403 { "@7", &_rl_term_at7 },
404 { "DC", &_rl_term_DC },
405 { "IC", &_rl_term_IC },
406 { "ce", &_rl_term_clreol },
407 { "cl", &_rl_term_clrpag },
408 { "cr", &_rl_term_cr },
409 { "dc", &_rl_term_dc },
410 { "ei", &_rl_term_ei },
411 { "ic", &_rl_term_ic },
412 { "im", &_rl_term_im },
413 { "kD", &_rl_term_kD }, /* delete */
414 { "kH", &_rl_term_kH }, /* home down ?? */
415 { "kI", &_rl_term_kI }, /* insert */
416 { "kd", &_rl_term_kd },
417 { "ke", &_rl_term_ke }, /* end keypad mode */
418 { "kh", &_rl_term_kh }, /* home */
419 { "kl", &_rl_term_kl },
420 { "kr", &_rl_term_kr },
421 { "ks", &_rl_term_ks }, /* start keypad mode */
422 { "ku", &_rl_term_ku },
423 { "le", &_rl_term_backspace },
424 { "mm", &_rl_term_mm },
425 { "mo", &_rl_term_mo },
426 { "nd", &_rl_term_forward_char },
427 { "pc", &_rl_term_pc },
428 { "up", &_rl_term_up },
429 { "vb", &_rl_visible_bell },
430 { "vs", &_rl_term_vs },
431 { "ve", &_rl_term_ve },
434 #define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))
436 /* Read the desired terminal capability strings into BP. The capabilities
437 are described in the TC_STRINGS table. */
439 get_term_capabilities (bp)
442 #if !defined (__DJGPP__) /* XXX - doesn't DJGPP have a termcap library? */
445 for (i = 0; i < NUM_TC_STRINGS; i++)
446 *(tc_strings[i].tc_value) = tgetstr ((char *)tc_strings[i].tc_var, bp);
448 tcap_initialized = 1;
452 _rl_init_terminal_io (terminal_name)
453 const char *terminal_name;
457 int tty, tgetent_ret;
459 term = terminal_name ? terminal_name : sh_get_env_value ("TERM");
460 _rl_term_clrpag = _rl_term_cr = _rl_term_clreol = (char *)NULL;
461 tty = rl_instream ? fileno (rl_instream) : 0;
467 _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;
468 _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;
469 _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;
470 _rl_term_mm = _rl_term_mo = (char *)NULL;
471 _rl_terminal_can_insert = term_has_meta = _rl_term_autowrap = 0;
473 _rl_term_clreol = _rl_term_clrpag = _rl_term_backspace = (char *)NULL;
474 _rl_term_goto = _rl_term_pc = _rl_term_ip = (char *)NULL;
475 _rl_term_ks = _rl_term_ke =_rl_term_vs = _rl_term_ve = (char *)NULL;
476 _rl_term_kh = _rl_term_kH = _rl_term_at7 = _rl_term_kI = (char *)NULL;
477 #if defined(HACK_TERMCAP_MOTION)
478 _rl_term_forward_char = (char *)NULL;
481 _rl_get_screen_size (tty, 0);
482 #else /* !__MSDOS__ */
483 /* I've separated this out for later work on not calling tgetent at all
484 if the calling application has supplied a custom redisplay function,
485 (and possibly if the application has supplied a custom input function). */
486 if (CUSTOM_REDISPLAY_FUNC())
492 if (term_string_buffer == 0)
493 term_string_buffer = (char *)xmalloc(2032);
495 if (term_buffer == 0)
496 term_buffer = (char *)xmalloc(4080);
498 buffer = term_string_buffer;
500 tgetent_ret = tgetent (term_buffer, term);
503 if (tgetent_ret <= 0)
505 FREE (term_string_buffer);
507 buffer = term_buffer = term_string_buffer = (char *)NULL;
509 _rl_term_autowrap = 0; /* used by _rl_get_screen_size */
511 /* Allow calling application to set default height and width, using
512 rl_set_screen_size */
513 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
515 #if defined (__EMX__)
516 _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
519 _rl_get_screen_size (tty, 0);
520 #endif /* !__EMX__ */
524 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
526 _rl_screenwidth = 79;
527 _rl_screenheight = 24;
530 /* Everything below here is used by the redisplay code (tputs). */
531 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
533 _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;
534 _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;
535 _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;
536 _rl_term_kh = _rl_term_kH = _rl_term_kI = _rl_term_kD = (char *)NULL;
537 _rl_term_ks = _rl_term_ke = _rl_term_at7 = (char *)NULL;
538 _rl_term_mm = _rl_term_mo = (char *)NULL;
539 _rl_term_ve = _rl_term_vs = (char *)NULL;
540 _rl_term_forward_char = (char *)NULL;
541 _rl_terminal_can_insert = term_has_meta = 0;
543 /* Reasonable defaults for tgoto(). Readline currently only uses
544 tgoto if _rl_term_IC or _rl_term_DC is defined, but just in case we
545 change that later... */
547 BC = _rl_term_backspace = "\b";
553 get_term_capabilities (&buffer);
555 /* Set up the variables that the termcap library expects the application
557 PC = _rl_term_pc ? *_rl_term_pc : 0;
558 BC = _rl_term_backspace;
564 _rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");
566 /* Allow calling application to set default height and width, using
567 rl_set_screen_size */
568 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
569 _rl_get_screen_size (tty, 0);
571 /* "An application program can assume that the terminal can do
572 character insertion if *any one of* the capabilities `IC',
573 `im', `ic' or `ip' is provided." But we can't do anything if
574 only `ip' is provided, so... */
575 _rl_terminal_can_insert = (_rl_term_IC || _rl_term_im || _rl_term_ic);
577 /* Check to see if this terminal has a meta key and clear the capability
578 variables if there is none. */
579 term_has_meta = tgetflag ("km") != 0;
580 if (term_has_meta == 0)
581 _rl_term_mm = _rl_term_mo = (char *)NULL;
583 #endif /* !__MSDOS__ */
585 /* Attempt to find and bind the arrow keys. Do not override already
586 bound keys in an overzealous attempt, however. */
588 bind_termcap_arrow_keys (emacs_standard_keymap);
590 #if defined (VI_MODE)
591 bind_termcap_arrow_keys (vi_movement_keymap);
592 bind_termcap_arrow_keys (vi_insertion_keymap);
598 /* Bind the arrow key sequences from the termcap description in MAP. */
600 bind_termcap_arrow_keys (map)
605 xkeymap = _rl_keymap;
608 rl_bind_keyseq_if_unbound (_rl_term_ku, rl_get_previous_history);
609 rl_bind_keyseq_if_unbound (_rl_term_kd, rl_get_next_history);
610 rl_bind_keyseq_if_unbound (_rl_term_kr, rl_forward_char);
611 rl_bind_keyseq_if_unbound (_rl_term_kl, rl_backward_char);
613 rl_bind_keyseq_if_unbound (_rl_term_kh, rl_beg_of_line); /* Home */
614 rl_bind_keyseq_if_unbound (_rl_term_at7, rl_end_of_line); /* End */
616 rl_bind_keyseq_if_unbound (_rl_term_kD, rl_delete);
618 _rl_keymap = xkeymap;
627 if (tcap_initialized == 0)
628 return ((char *)NULL);
629 for (i = 0; i < NUM_TC_STRINGS; i++)
631 if (tc_strings[i].tc_var[0] == cap[0] && strcmp (tc_strings[i].tc_var, cap) == 0)
632 return *(tc_strings[i].tc_value);
634 return ((char *)NULL);
637 /* Re-initialize the terminal considering that the TERM/TERMCAP variable
640 rl_reset_terminal (terminal_name)
641 const char *terminal_name;
643 _rl_screenwidth = _rl_screenheight = 0;
644 _rl_init_terminal_io (terminal_name);
648 /* A function for the use of tputs () */
651 _rl_output_character_function (c)
654 putc (c, _rl_out_stream);
658 _rl_output_character_function (c)
661 return putc (c, _rl_out_stream);
665 /* Write COUNT characters from STRING to the output stream. */
667 _rl_output_some_chars (string, count)
671 fwrite (string, 1, count, _rl_out_stream);
674 /* Move the cursor back. */
676 _rl_backspace (count)
682 if (_rl_term_backspace)
683 for (i = 0; i < count; i++)
684 tputs (_rl_term_backspace, 1, _rl_output_character_function);
687 for (i = 0; i < count; i++)
688 putc ('\b', _rl_out_stream);
692 /* Move to the start of the next line. */
696 #if defined (NEW_TTY_DRIVER) || defined (__MINT__)
698 tputs (_rl_term_cr, 1, _rl_output_character_function);
699 #endif /* NEW_TTY_DRIVER || __MINT__ */
700 putc ('\n', _rl_out_stream);
704 /* Ring the terminal bell. */
710 switch (_rl_bell_preference)
720 if (_rl_visible_bell)
722 tputs (_rl_visible_bell, 1, _rl_output_character_function);
728 fprintf (stderr, "\007");
737 /* **************************************************************** */
739 /* Controlling the Meta Key and Keypad */
741 /* **************************************************************** */
744 _rl_enable_meta_key ()
746 #if !defined (__DJGPP__)
747 if (term_has_meta && _rl_term_mm)
748 tputs (_rl_term_mm, 1, _rl_output_character_function);
753 _rl_control_keypad (on)
756 #if !defined (__DJGPP__)
757 if (on && _rl_term_ks)
758 tputs (_rl_term_ks, 1, _rl_output_character_function);
759 else if (!on && _rl_term_ke)
760 tputs (_rl_term_ke, 1, _rl_output_character_function);
764 /* **************************************************************** */
766 /* Controlling the Cursor */
768 /* **************************************************************** */
770 /* Set the cursor appropriately depending on IM, which is one of the
771 insert modes (insert or overwrite). Insert mode gets the normal
772 cursor. Overwrite mode gets a very visible cursor. Only does
773 anything if we have both capabilities. */
775 _rl_set_cursor (im, force)
779 if (_rl_term_ve && _rl_term_vs)
781 if (force || im != rl_insert_mode)
783 if (im == RL_IM_OVERWRITE)
784 tputs (_rl_term_vs, 1, _rl_output_character_function);
786 tputs (_rl_term_ve, 1, _rl_output_character_function);