2 /* terminal.c -- controlling the terminal with termcap. */
4 /* Copyright (C) 1996 Free Software Foundation, Inc.
6 This file is part of the GNU Readline Library, a library for
7 reading lines of text with interactive input and history editing.
9 The GNU Readline Library is free software; you can redistribute it
10 and/or modify it under the terms of the GNU General Public License
11 as published by the Free Software Foundation; either version 2, or
12 (at your option) any later version.
14 The GNU Readline Library is distributed in the hope that it will be
15 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
16 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 The GNU General Public License is often shipped with GNU software, and
20 is generally kept in a file called COPYING or LICENSE. If you do not
21 have a copy of the license, write to the Free Software Foundation,
22 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23 #define READLINE_LIBRARY
25 #if defined (HAVE_CONFIG_H)
29 #include <sys/types.h>
30 #include "posixstat.h"
32 #if defined (HAVE_SYS_FILE_H)
33 # include <sys/file.h>
34 #endif /* HAVE_SYS_FILE_H */
36 #if defined (HAVE_UNISTD_H)
38 #endif /* HAVE_UNISTD_H */
40 #if defined (HAVE_STDLIB_H)
43 # include "ansi_stdlib.h"
44 #endif /* HAVE_STDLIB_H */
46 #if defined (HAVE_LOCALE_H)
52 /* System-specific feature definitions and include files. */
55 #if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
56 # include <sys/ioctl.h>
57 #endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
62 /* Some standard library routines. */
66 #include "rlprivate.h"
69 /* **************************************************************** */
71 /* Terminal and Termcap */
73 /* **************************************************************** */
75 static char *term_buffer = (char *)NULL;
76 static char *term_string_buffer = (char *)NULL;
78 static int tcap_initialized;
80 #if !defined (__linux__)
81 # if defined (__EMX__) || defined (NEED_EXTERN_PC)
83 # endif /* __EMX__ || NEED_EXTERN_PC */
85 #endif /* __linux__ */
87 /* Some strings to control terminal actions. These are output by tputs (). */
88 char *_rl_term_clreol;
89 char *_rl_term_clrpag;
91 char *_rl_term_backspace;
95 /* Non-zero if we determine that the terminal can do character insertion. */
96 int _rl_terminal_can_insert = 0;
98 /* How to insert characters. */
105 /* How to delete characters. */
109 #if defined (HACK_TERMCAP_MOTION)
110 char *_rl_term_forward_char;
111 #endif /* HACK_TERMCAP_MOTION */
113 /* How to go up a line. */
116 /* A visible bell; char if the terminal can be made to flash the screen. */
117 static char *_rl_visible_bell;
119 /* Non-zero means the terminal can auto-wrap lines. */
120 int _rl_term_autowrap;
122 /* Non-zero means that this terminal has a meta key. */
123 static int term_has_meta;
125 /* The sequences to write to turn on and off the meta key, if this
127 static char *_rl_term_mm;
128 static char *_rl_term_mo;
130 /* The key sequences output by the arrow keys, if this terminal has any. */
131 static char *_rl_term_ku;
132 static char *_rl_term_kd;
133 static char *_rl_term_kr;
134 static char *_rl_term_kl;
136 /* How to initialize and reset the arrow keys, if this terminal has any. */
137 static char *_rl_term_ks;
138 static char *_rl_term_ke;
140 /* The key sequences sent by the Home and End keys, if any. */
141 static char *_rl_term_kh;
142 static char *_rl_term_kH;
144 /* Variables that hold the screen dimensions, used by the display code. */
145 int _rl_screenwidth, _rl_screenheight, _rl_screenchars;
147 /* Non-zero means the user wants to enable the keypad. */
148 int _rl_enable_keypad;
150 /* Non-zero means the user wants to enable a meta key. */
151 int _rl_enable_meta = 1;
153 #if defined (__EMX__)
155 _emx_get_screensize (swp, shp)
169 /* Get readline's idea of the screen size. TTY is a file descriptor open
170 to the terminal. If IGNORE_ENV is true, we do not pay attention to the
171 values of $LINES and $COLUMNS. The tests for TERM_STRING_BUFFER being
172 non-null serve to check whether or not we have initialized termcap. */
174 _rl_get_screen_size (tty, ignore_env)
178 #if defined (TIOCGWINSZ)
179 struct winsize window_size;
180 #endif /* TIOCGWINSZ */
182 #if defined (TIOCGWINSZ)
183 if (ioctl (tty, TIOCGWINSZ, &window_size) == 0)
185 _rl_screenwidth = (int) window_size.ws_col;
186 _rl_screenheight = (int) window_size.ws_row;
188 #endif /* TIOCGWINSZ */
190 #if defined (__EMX__)
191 _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
194 /* Environment variable COLUMNS overrides setting of "co" if IGNORE_ENV
196 if (_rl_screenwidth <= 0)
198 if (ignore_env == 0 && (ss = sh_get_env_value ("COLUMNS")))
199 _rl_screenwidth = atoi (ss);
201 #if !defined (__DJGPP__)
202 if (_rl_screenwidth <= 0 && term_string_buffer)
203 _rl_screenwidth = tgetnum ("co");
207 /* Environment variable LINES overrides setting of "li" if IGNORE_ENV
209 if (_rl_screenheight <= 0)
211 if (ignore_env == 0 && (ss = sh_get_env_value ("LINES")))
212 _rl_screenheight = atoi (ss);
214 #if !defined (__DJGPP__)
215 if (_rl_screenheight <= 0 && term_string_buffer)
216 _rl_screenheight = tgetnum ("li");
220 /* If all else fails, default to 80x24 terminal. */
221 if (_rl_screenwidth <= 1)
222 _rl_screenwidth = 80;
224 if (_rl_screenheight <= 0)
225 _rl_screenheight = 24;
227 /* If we're being compiled as part of bash, set the environment
228 variables $LINES and $COLUMNS to new values. Otherwise, just
229 do a pair of putenv () or setenv () calls. */
230 sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);
232 if (_rl_term_autowrap == 0)
235 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
239 _rl_set_screen_size (rows, cols)
242 if (rows == 0 || cols == 0)
245 _rl_screenheight = rows;
246 _rl_screenwidth = cols;
248 if (_rl_term_autowrap == 0)
251 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
255 rl_set_screen_size (rows, cols)
258 _rl_set_screen_size (rows, cols);
262 rl_get_screen_size (rows, cols)
266 *rows = _rl_screenheight;
268 *cols = _rl_screenwidth;
272 rl_resize_terminal ()
274 if (readline_echoing_p)
276 _rl_get_screen_size (fileno (rl_instream), 1);
277 _rl_redisplay_after_sigwinch ();
286 /* This should be kept sorted, just in case we decide to change the
287 search algorithm to something smarter. */
288 static struct _tc_string tc_strings[] =
290 { "DC", &_rl_term_DC },
291 { "IC", &_rl_term_IC },
292 { "ce", &_rl_term_clreol },
293 { "cl", &_rl_term_clrpag },
294 { "cr", &_rl_term_cr },
295 { "dc", &_rl_term_dc },
296 { "ei", &_rl_term_ei },
297 { "ic", &_rl_term_ic },
298 { "im", &_rl_term_im },
299 { "kd", &_rl_term_kd },
300 { "kh", &_rl_term_kh }, /* home */
301 { "@7", &_rl_term_kH }, /* end */
302 { "kl", &_rl_term_kl },
303 { "kr", &_rl_term_kr },
304 { "ku", &_rl_term_ku },
305 { "ks", &_rl_term_ks },
306 { "ke", &_rl_term_ke },
307 { "le", &_rl_term_backspace },
308 { "mm", &_rl_term_mm },
309 { "mo", &_rl_term_mo },
310 #if defined (HACK_TERMCAP_MOTION)
311 { "nd", &_rl_term_forward_char },
313 { "pc", &_rl_term_pc },
314 { "up", &_rl_term_up },
315 { "vb", &_rl_visible_bell },
318 #define NUM_TC_STRINGS (sizeof (tc_strings) / sizeof (struct _tc_string))
320 /* Read the desired terminal capability strings into BP. The capabilities
321 are described in the TC_STRINGS table. */
323 get_term_capabilities (bp)
326 #if !defined (__DJGPP__) /* XXX - doesn't DJGPP have a termcap library? */
329 for (i = 0; i < NUM_TC_STRINGS; i++)
330 *(tc_strings[i].tc_value) = tgetstr (tc_strings[i].tc_var, bp);
332 tcap_initialized = 1;
335 #define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)
336 #define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)
339 _rl_init_terminal_io (terminal_name)
340 const char *terminal_name;
344 int tty, tgetent_ret;
347 term = terminal_name ? terminal_name : sh_get_env_value ("TERM");
348 _rl_term_clrpag = _rl_term_cr = _rl_term_clreol = (char *)NULL;
349 tty = rl_instream ? fileno (rl_instream) : 0;
350 _rl_screenwidth = _rl_screenheight = 0;
355 /* I've separated this out for later work on not calling tgetent at all
356 if the calling application has supplied a custom redisplay function,
357 (and possibly if the application has supplied a custom input function). */
358 if (CUSTOM_REDISPLAY_FUNC())
364 if (term_string_buffer == 0)
365 term_string_buffer = xmalloc(2032);
367 if (term_buffer == 0)
368 term_buffer = xmalloc(4080);
370 buffer = term_string_buffer;
372 tgetent_ret = tgetent (term_buffer, term);
375 if (tgetent_ret <= 0)
377 FREE (term_string_buffer);
379 buffer = term_buffer = term_string_buffer = (char *)NULL;
381 _rl_term_autowrap = 0; /* used by _rl_get_screen_size */
383 #if defined (__EMX__)
384 _emx_get_screensize (&_rl_screenwidth, &_rl_screenheight);
387 _rl_get_screen_size (tty, 0);
388 #endif /* !__EMX__ */
391 if (_rl_screenwidth <= 0 || _rl_screenheight <= 0)
393 _rl_screenwidth = 79;
394 _rl_screenheight = 24;
397 /* Everything below here is used by the redisplay code (tputs). */
398 _rl_screenchars = _rl_screenwidth * _rl_screenheight;
400 _rl_term_im = _rl_term_ei = _rl_term_ic = _rl_term_IC = (char *)NULL;
401 _rl_term_up = _rl_term_dc = _rl_term_DC = _rl_visible_bell = (char *)NULL;
402 _rl_term_ku = _rl_term_kd = _rl_term_kl = _rl_term_kr = (char *)NULL;
403 _rl_term_mm = _rl_term_mo = (char *)NULL;
404 #if defined (HACK_TERMCAP_MOTION)
405 term_forward_char = (char *)NULL;
407 _rl_terminal_can_insert = term_has_meta = 0;
409 /* Reasonable defaults for tgoto(). Readline currently only uses
410 tgoto if _rl_term_IC or _rl_term_DC is defined, but just in case we
411 change that later... */
413 BC = _rl_term_backspace = "\b";
419 get_term_capabilities (&buffer);
421 /* Set up the variables that the termcap library expects the application
423 PC = _rl_term_pc ? *_rl_term_pc : 0;
424 BC = _rl_term_backspace;
430 _rl_term_autowrap = tgetflag ("am") && tgetflag ("xn");
432 _rl_get_screen_size (tty, 0);
434 /* "An application program can assume that the terminal can do
435 character insertion if *any one of* the capabilities `IC',
436 `im', `ic' or `ip' is provided." But we can't do anything if
437 only `ip' is provided, so... */
438 _rl_terminal_can_insert = (_rl_term_IC || _rl_term_im || _rl_term_ic);
440 /* Check to see if this terminal has a meta key and clear the capability
441 variables if there is none. */
442 term_has_meta = (tgetflag ("km") || tgetflag ("MT"));
444 _rl_term_mm = _rl_term_mo = (char *)NULL;
446 /* Attempt to find and bind the arrow keys. Do not override already
447 bound keys in an overzealous attempt, however. */
448 xkeymap = _rl_keymap;
450 _rl_keymap = emacs_standard_keymap;
451 _rl_bind_if_unbound (_rl_term_ku, rl_get_previous_history);
452 _rl_bind_if_unbound (_rl_term_kd, rl_get_next_history);
453 _rl_bind_if_unbound (_rl_term_kr, rl_forward);
454 _rl_bind_if_unbound (_rl_term_kl, rl_backward);
456 _rl_bind_if_unbound (_rl_term_kh, rl_beg_of_line); /* Home */
457 _rl_bind_if_unbound (_rl_term_kH, rl_end_of_line); /* End */
459 #if defined (VI_MODE)
460 _rl_keymap = vi_movement_keymap;
461 _rl_bind_if_unbound (_rl_term_ku, rl_get_previous_history);
462 _rl_bind_if_unbound (_rl_term_kd, rl_get_next_history);
463 _rl_bind_if_unbound (_rl_term_kr, rl_forward);
464 _rl_bind_if_unbound (_rl_term_kl, rl_backward);
466 _rl_bind_if_unbound (_rl_term_kh, rl_beg_of_line); /* Home */
467 _rl_bind_if_unbound (_rl_term_kH, rl_end_of_line); /* End */
470 _rl_keymap = xkeymap;
481 if (tcap_initialized == 0)
482 return ((char *)NULL);
483 for (i = 0; i < NUM_TC_STRINGS; i++)
485 if (tc_strings[i].tc_var[0] == cap[0] && strcmp (tc_strings[i].tc_var, cap) == 0)
486 return *(tc_strings[i].tc_value);
488 return ((char *)NULL);
491 /* Re-initialize the terminal considering that the TERM/TERMCAP variable
494 rl_reset_terminal (terminal_name)
495 const char *terminal_name;
497 _rl_init_terminal_io (terminal_name);
501 /* A function for the use of tputs () */
504 _rl_output_character_function (c)
507 putc (c, _rl_out_stream);
511 _rl_output_character_function (c)
514 return putc (c, _rl_out_stream);
518 /* Write COUNT characters from STRING to the output stream. */
520 _rl_output_some_chars (string, count)
524 fwrite (string, 1, count, _rl_out_stream);
527 /* Move the cursor back. */
529 _rl_backspace (count)
534 if (_rl_term_backspace)
535 for (i = 0; i < count; i++)
536 tputs (_rl_term_backspace, 1, _rl_output_character_function);
538 for (i = 0; i < count; i++)
539 putc ('\b', _rl_out_stream);
543 /* Move to the start of the next line. */
547 #if defined (NEW_TTY_DRIVER)
549 tputs (_rl_term_cr, 1, _rl_output_character_function);
550 #endif /* NEW_TTY_DRIVER */
551 putc ('\n', _rl_out_stream);
555 /* Ring the terminal bell. */
559 if (readline_echoing_p)
561 switch (_rl_bell_preference)
567 if (_rl_visible_bell)
569 tputs (_rl_visible_bell, 1, _rl_output_character_function);
574 fprintf (stderr, "\007");
583 /* **************************************************************** */
585 /* Controlling the Meta Key and Keypad */
587 /* **************************************************************** */
590 _rl_enable_meta_key ()
592 #if !defined (__DJGPP__)
593 if (term_has_meta && _rl_term_mm)
594 tputs (_rl_term_mm, 1, _rl_output_character_function);
599 _rl_control_keypad (on)
602 #if !defined (__DJGPP__)
603 if (on && _rl_term_ks)
604 tputs (_rl_term_ks, 1, _rl_output_character_function);
605 else if (!on && _rl_term_ke)
606 tputs (_rl_term_ke, 1, _rl_output_character_function);