1 /* terminal.c -- controlling the terminal with termcap. */
3 /* Copyright (C) 1996-2017 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. */
59 #if defined (HAVE_SYS_IOCTL_H)
60 # include <sys/ioctl.h> /* include for declaration of ioctl */
64 /* Some standard library routines. */
68 #include "rlprivate.h"
72 #if defined (__MINGW32__)
76 static void _win_get_screensize PARAMS((int *, int *));
80 static void _emx_get_screensize PARAMS((int *, int *));
83 /* If the calling application sets this to a non-zero value, readline will
84 use the $LINES and $COLUMNS environment variables to set its idea of the
85 window size before interrogating the kernel. */
86 int rl_prefer_env_winsize = 0;
88 /* If this is non-zero, readline will set LINES and COLUMNS in the
89 environment when it handles SIGWINCH. */
90 int rl_change_environment = 1;
92 /* **************************************************************** */
94 /* Terminal and Termcap */
96 /* **************************************************************** */
99 static char *term_buffer = (char *)NULL;
100 static char *term_string_buffer = (char *)NULL;
103 static int tcap_initialized;
105 #if !defined (__linux__) && !defined (NCURSES_VERSION)
106 # if defined (__EMX__) || defined (NEED_EXTERN_PC)
108 # endif /* __EMX__ || NEED_EXTERN_PC */
110 #endif /* !__linux__ && !NCURSES_VERSION */
112 /* Some strings to control terminal actions. These are output by tputs (). */
113 char *_rl_term_clreol;
114 char *_rl_term_clrpag;
115 char *_rl_term_clrscroll;
117 char *_rl_term_backspace;
121 /* Non-zero if we determine that the terminal can do character insertion. */
122 int _rl_terminal_can_insert = 0;
124 /* How to insert characters. */
131 /* How to delete characters. */
135 /* How to move forward a char, non-destructively */
136 char *_rl_term_forward_char;
138 /* How to go up a line. */
141 /* A visible bell; char if the terminal can be made to flash the screen. */
142 static char *_rl_visible_bell;
144 /* Non-zero means the terminal can auto-wrap lines. */
145 int _rl_term_autowrap = -1;
147 /* Non-zero means that this terminal has a meta key. */
148 static int term_has_meta;
150 /* The sequences to write to turn on and off the meta key, if this
152 static char *_rl_term_mm;
153 static char *_rl_term_mo;
155 /* The key sequences output by the arrow keys, if this terminal has any. */
156 static char *_rl_term_ku;
157 static char *_rl_term_kd;
158 static char *_rl_term_kr;
159 static char *_rl_term_kl;
161 /* How to initialize and reset the arrow keys, if this terminal has any. */
162 static char *_rl_term_ks;
163 static char *_rl_term_ke;
165 /* The key sequences sent by the Home and End keys, if any. */
166 static char *_rl_term_kh;
167 static char *_rl_term_kH;
168 static char *_rl_term_at7; /* @7 */
171 static char *_rl_term_kD;
174 static char *_rl_term_kI;
177 static char *_rl_term_vs; /* very visible */
178 static char *_rl_term_ve; /* normal */
180 static void bind_termcap_arrow_keys PARAMS((Keymap));
182 /* Variables that hold the screen dimensions, used by the display code. */
183 int _rl_screenwidth, _rl_screenheight, _rl_screenchars;
185 /* Non-zero means the user wants to enable the keypad. */
186 int _rl_enable_keypad;
188 /* Non-zero means the user wants to enable a meta key. */
189 int _rl_enable_meta = 1;
191 #if defined (__EMX__)
193 _emx_get_screensize (int *swp, int *shp)
206 #if defined (__MINGW32__)
208 _win_get_screensize (int *swp, int *shp)
211 CONSOLE_SCREEN_BUFFER_INFO scr;
213 hConOut = GetStdHandle (STD_OUTPUT_HANDLE);
214 if (hConOut != INVALID_HANDLE_VALUE)
216 if (GetConsoleScreenBufferInfo (hConOut, &scr))
219 *shp = scr.srWindow.Bottom - scr.srWindow.Top + 1;
225 /* Get readline's idea of the screen size. TTY is a file descriptor open
226 to the terminal. If IGNORE_ENV is true, we do not pay attention to the
227 values of $LINES and $COLUMNS. The tests for TERM_STRING_BUFFER being
228 non-null serve to check whether or not we have initialized termcap. */
230 _rl_get_screen_size (int tty, int ignore_env)
233 #if defined (TIOCGWINSZ)
234 struct winsize window_size;
235 #endif /* TIOCGWINSZ */
239 #if defined (TIOCGWINSZ)
240 if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
242 wc = (int) window_size.ws_col;
243 wr = (int) window_size.ws_row;
245 #endif /* TIOCGWINSZ */
247 #if defined (__EMX__)
248 _emx_get_screensize (&wc, &wr);
249 #elif defined (__MINGW32__)
250 _win_get_screensize (&wc, &wr);
253 if (ignore_env || rl_prefer_env_winsize == 0)
255 _rl_screenwidth = wc;
256 _rl_screenheight = wr;
259 _rl_screenwidth = _rl_screenheight = -1;
261 /* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
262 is unset. If we prefer the environment, check it first before
263 assigning the value returned by the kernel. */
264 if (_rl_screenwidth <= 0)
266 if (ignore_env == 0 && (ss = sh_get_env_value ("COLUMNS")))
267 _rl_screenwidth = atoi (ss);
269 if (_rl_screenwidth <= 0)
270 _rl_screenwidth = wc;
272 #if defined (__DJGPP__)
273 if (_rl_screenwidth <= 0)
274 _rl_screenwidth = ScreenCols ();
276 if (_rl_screenwidth <= 0 && term_string_buffer)
277 _rl_screenwidth = tgetnum ("co");
281 /* Environment variable LINES overrides setting of "li" if IGNORE_ENV
283 if (_rl_screenheight <= 0)
285 if (ignore_env == 0 && (ss = sh_get_env_value ("LINES")))
286 _rl_screenheight = atoi (ss);
288 if (_rl_screenheight <= 0)
289 _rl_screenheight = wr;
291 #if defined (__DJGPP__)
292 if (_rl_screenheight <= 0)
293 _rl_screenheight = ScreenRows ();
295 if (_rl_screenheight <= 0 && term_string_buffer)
296 _rl_screenheight = tgetnum ("li");
300 /* If all else fails, default to 80x24 terminal. */
301 if (_rl_screenwidth <= 1)
302 _rl_screenwidth = 80;
304 if (_rl_screenheight <= 0)
305 _rl_screenheight = 24;
307 /* If we're being compiled as part of bash, set the environment
308 variables $LINES and $COLUMNS to new values. Otherwise, just
309 do a pair of putenv () or setenv () calls. */
310 if (rl_change_environment)
311 sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);
313 if (_rl_term_autowrap == 0)
316 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
320 _rl_set_screen_size (int rows, int cols)
322 if (_rl_term_autowrap == -1)
323 _rl_init_terminal_io (rl_terminal_name);
326 _rl_screenheight = rows;
329 _rl_screenwidth = cols;
330 if (_rl_term_autowrap == 0)
334 if (rows > 0 || cols > 0)
335 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
339 rl_set_screen_size (int rows, int cols)
341 _rl_set_screen_size (rows, cols);
345 rl_get_screen_size (int *rows, int *cols)
348 *rows = _rl_screenheight;
350 *cols = _rl_screenwidth;
354 rl_reset_screen_size (void)
356 _rl_get_screen_size (fileno (rl_instream), 0);
360 _rl_sigwinch_resize_terminal (void)
362 _rl_get_screen_size (fileno (rl_instream), 1);
366 rl_resize_terminal (void)
368 _rl_get_screen_size (fileno (rl_instream), 1);
371 if (CUSTOM_REDISPLAY_FUNC ())
372 rl_forced_update_display ();
373 else if (RL_ISSTATE(RL_STATE_REDISPLAYING) == 0)
374 _rl_redisplay_after_sigwinch ();
379 const char * const tc_var;
383 /* This should be kept sorted, just in case we decide to change the
384 search algorithm to something smarter. */
385 static const struct _tc_string tc_strings[] =
387 { "@7", &_rl_term_at7 },
388 { "DC", &_rl_term_DC },
389 { "E3", &_rl_term_clrscroll },
390 { "IC", &_rl_term_IC },
391 { "ce", &_rl_term_clreol },
392 { "cl", &_rl_term_clrpag },
393 { "cr", &_rl_term_cr },
394 { "dc", &_rl_term_dc },
395 { "ei", &_rl_term_ei },
396 { "ic", &_rl_term_ic },
397 { "im", &_rl_term_im },
398 { "kD", &_rl_term_kD }, /* delete */
399 { "kH", &_rl_term_kH }, /* home down ?? */
400 { "kI", &_rl_term_kI }, /* insert */
401 { "kd", &_rl_term_kd },
402 { "ke", &_rl_term_ke }, /* end keypad mode */
403 { "kh", &_rl_term_kh }, /* home */
404 { "kl", &_rl_term_kl },
405 { "kr", &_rl_term_kr },
406 { "ks", &_rl_term_ks }, /* start keypad mode */
407 { "ku", &_rl_term_ku },
408 { "le", &_rl_term_backspace },
409 { "mm", &_rl_term_mm },
410 { "mo", &_rl_term_mo },
411 { "nd", &_rl_term_forward_char },
412 { "pc", &_rl_term_pc },
413 { "up", &_rl_term_up },
414 { "vb", &_rl_visible_bell },
415 { "vs", &_rl_term_vs },
416 { "ve", &_rl_term_ve },
419 #define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))
421 /* Read the desired terminal capability strings into BP. The capabilities
422 are described in the TC_STRINGS table. */
424 get_term_capabilities (char **bp)
426 #if !defined (__DJGPP__) /* XXX - doesn't DJGPP have a termcap library? */
429 for (i = 0; i < NUM_TC_STRINGS; i++)
430 *(tc_strings[i].tc_value) = tgetstr ((char *)tc_strings[i].tc_var, bp);
432 tcap_initialized = 1;
436 _rl_init_terminal_io (const char *terminal_name)
440 int tty, tgetent_ret;
442 term = terminal_name ? terminal_name : sh_get_env_value ("TERM");
443 _rl_term_clrpag = _rl_term_cr = _rl_term_clreol = _rl_term_clrscroll = (char *)NULL;
444 tty = rl_instream ? fileno (rl_instream) : 0;
450 _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;
451 _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;
452 _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;
453 _rl_term_mm = _rl_term_mo = (char *)NULL;
454 _rl_terminal_can_insert = term_has_meta = _rl_term_autowrap = 0;
456 _rl_term_backspace = (char *)NULL;
457 _rl_term_goto = _rl_term_pc = _rl_term_ip = (char *)NULL;
458 _rl_term_ks = _rl_term_ke =_rl_term_vs = _rl_term_ve = (char *)NULL;
459 _rl_term_kh = _rl_term_kH = _rl_term_at7 = _rl_term_kI = (char *)NULL;
460 #if defined(HACK_TERMCAP_MOTION)
461 _rl_term_forward_char = (char *)NULL;
464 _rl_get_screen_size (tty, 0);
465 #else /* !__MSDOS__ */
466 /* I've separated this out for later work on not calling tgetent at all
467 if the calling application has supplied a custom redisplay function,
468 (and possibly if the application has supplied a custom input function). */
469 if (CUSTOM_REDISPLAY_FUNC())
475 if (term_string_buffer == 0)
476 term_string_buffer = (char *)xmalloc(2032);
478 if (term_buffer == 0)
479 term_buffer = (char *)xmalloc(4080);
481 buffer = term_string_buffer;
483 tgetent_ret = tgetent (term_buffer, term);
486 if (tgetent_ret <= 0)
488 FREE (term_string_buffer);
490 buffer = term_buffer = term_string_buffer = (char *)NULL;
492 _rl_term_autowrap = 0; /* used by _rl_get_screen_size */
494 /* Allow calling application to set default height and width, using
495 rl_set_screen_size */
496 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
498 #if defined (__EMX__)
499 _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
502 _rl_get_screen_size (tty, 0);
503 #endif /* !__EMX__ */
507 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
509 _rl_screenwidth = 79;
510 _rl_screenheight = 24;
513 /* Everything below here is used by the redisplay code (tputs). */
514 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
516 _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;
517 _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;
518 _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;
519 _rl_term_kh = _rl_term_kH = _rl_term_kI = _rl_term_kD = (char *)NULL;
520 _rl_term_ks = _rl_term_ke = _rl_term_at7 = (char *)NULL;
521 _rl_term_mm = _rl_term_mo = (char *)NULL;
522 _rl_term_ve = _rl_term_vs = (char *)NULL;
523 _rl_term_forward_char = (char *)NULL;
524 _rl_terminal_can_insert = term_has_meta = 0;
526 /* Reasonable defaults for tgoto(). Readline currently only uses
527 tgoto if _rl_term_IC or _rl_term_DC is defined, but just in case we
528 change that later... */
530 BC = _rl_term_backspace = "\b";
536 get_term_capabilities (&buffer);
538 /* Set up the variables that the termcap library expects the application
540 PC = _rl_term_pc ? *_rl_term_pc : 0;
541 BC = _rl_term_backspace;
547 _rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");
549 /* Allow calling application to set default height and width, using
550 rl_set_screen_size */
551 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
552 _rl_get_screen_size (tty, 0);
554 /* "An application program can assume that the terminal can do
555 character insertion if *any one of* the capabilities `IC',
556 `im', `ic' or `ip' is provided." But we can't do anything if
557 only `ip' is provided, so... */
558 _rl_terminal_can_insert = (_rl_term_IC || _rl_term_im || _rl_term_ic);
560 /* Check to see if this terminal has a meta key and clear the capability
561 variables if there is none. */
562 term_has_meta = tgetflag ("km") != 0;
563 if (term_has_meta == 0)
564 _rl_term_mm = _rl_term_mo = (char *)NULL;
565 #endif /* !__MSDOS__ */
567 /* Attempt to find and bind the arrow keys. Do not override already
568 bound keys in an overzealous attempt, however. */
570 bind_termcap_arrow_keys (emacs_standard_keymap);
572 #if defined (VI_MODE)
573 bind_termcap_arrow_keys (vi_movement_keymap);
574 bind_termcap_arrow_keys (vi_insertion_keymap);
580 /* Bind the arrow key sequences from the termcap description in MAP. */
582 bind_termcap_arrow_keys (Keymap map)
586 xkeymap = _rl_keymap;
589 rl_bind_keyseq_if_unbound (_rl_term_ku, rl_get_previous_history);
590 rl_bind_keyseq_if_unbound (_rl_term_kd, rl_get_next_history);
591 rl_bind_keyseq_if_unbound (_rl_term_kr, rl_forward_char);
592 rl_bind_keyseq_if_unbound (_rl_term_kl, rl_backward_char);
594 rl_bind_keyseq_if_unbound (_rl_term_kh, rl_beg_of_line); /* Home */
595 rl_bind_keyseq_if_unbound (_rl_term_at7, rl_end_of_line); /* End */
597 rl_bind_keyseq_if_unbound (_rl_term_kD, rl_delete);
598 rl_bind_keyseq_if_unbound (_rl_term_kI, rl_overwrite_mode); /* Insert */
600 _rl_keymap = xkeymap;
604 rl_get_termcap (const char *cap)
608 if (tcap_initialized == 0)
609 return ((char *)NULL);
610 for (i = 0; i < NUM_TC_STRINGS; i++)
612 if (tc_strings[i].tc_var[0] == cap[0] && strcmp (tc_strings[i].tc_var, cap) == 0)
613 return *(tc_strings[i].tc_value);
615 return ((char *)NULL);
618 /* Re-initialize the terminal considering that the TERM/TERMCAP variable
621 rl_reset_terminal (const char *terminal_name)
623 _rl_screenwidth = _rl_screenheight = 0;
624 _rl_init_terminal_io (terminal_name);
628 /* A function for the use of tputs () */
631 _rl_output_character_function (int c)
633 putc (c, _rl_out_stream);
637 _rl_output_character_function (int c)
639 return putc (c, _rl_out_stream);
643 /* Write COUNT characters from STRING to the output stream. */
645 _rl_output_some_chars (const char *string, int count)
647 fwrite (string, 1, count, _rl_out_stream);
650 /* Move the cursor back. */
652 _rl_backspace (int count)
657 if (_rl_term_backspace)
658 for (i = 0; i < count; i++)
659 tputs (_rl_term_backspace, 1, _rl_output_character_function);
662 for (i = 0; i < count; i++)
663 putc ('\b', _rl_out_stream);
667 /* Move to the start of the next line. */
671 #if defined (NEW_TTY_DRIVER) || defined (__MINT__)
673 tputs (_rl_term_cr, 1, _rl_output_character_function);
674 #endif /* NEW_TTY_DRIVER || __MINT__ */
675 putc ('\n', _rl_out_stream);
679 /* Ring the terminal bell. */
685 switch (_rl_bell_preference)
691 if (_rl_visible_bell)
696 tputs (_rl_visible_bell, 1, _rl_output_character_function);
702 fprintf (stderr, "\007");
711 /* **************************************************************** */
713 /* Controlling the Meta Key and Keypad */
715 /* **************************************************************** */
717 static int enabled_meta = 0; /* flag indicating we enabled meta mode */
720 _rl_enable_meta_key (void)
722 #if !defined (__DJGPP__)
723 if (term_has_meta && _rl_term_mm)
725 tputs (_rl_term_mm, 1, _rl_output_character_function);
732 _rl_disable_meta_key (void)
734 #if !defined (__DJGPP__)
735 if (term_has_meta && _rl_term_mo && enabled_meta)
737 tputs (_rl_term_mo, 1, _rl_output_character_function);
744 _rl_control_keypad (int on)
746 #if !defined (__DJGPP__)
747 if (on && _rl_term_ks)
748 tputs (_rl_term_ks, 1, _rl_output_character_function);
749 else if (!on && _rl_term_ke)
750 tputs (_rl_term_ke, 1, _rl_output_character_function);
754 /* **************************************************************** */
756 /* Controlling the Cursor */
758 /* **************************************************************** */
760 /* Set the cursor appropriately depending on IM, which is one of the
761 insert modes (insert or overwrite). Insert mode gets the normal
762 cursor. Overwrite mode gets a very visible cursor. Only does
763 anything if we have both capabilities. */
765 _rl_set_cursor (int im, int force)
768 if (_rl_term_ve && _rl_term_vs)
770 if (force || im != rl_insert_mode)
772 if (im == RL_IM_OVERWRITE)
773 tputs (_rl_term_vs, 1, _rl_output_character_function);
775 tputs (_rl_term_ve, 1, _rl_output_character_function);