GDB (xrefs)

tui-io.c
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1 /* TUI support I/O functions.
2
3 Copyright (C) 1998-2018 Free Software Foundation, Inc.
4
5 Contributed by Hewlett-Packard Company.
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22 #include "defs.h"
23 #include "target.h"
24 #include "event-loop.h"
25 #include "event-top.h"
26 #include "command.h"
27 #include "top.h"
28 #include "tui/tui.h"
29 #include "tui/tui-data.h"
30 #include "tui/tui-io.h"
31 #include "tui/tui-command.h"
32 #include "tui/tui-win.h"
33 #include "tui/tui-wingeneral.h"
34 #include "tui/tui-file.h"
35 #include "tui/tui-out.h"
36 #include "ui-out.h"
37 #include "cli-out.h"
38 #include <fcntl.h>
39 #include <signal.h>
40 #include "filestuff.h"
41 #include "completer.h"
42 #include "gdb_curses.h"
43
44 /* This redefines CTRL if it is not already defined, so it must come
45 after terminal state releated include files like <term.h> and
46 "gdb_curses.h". */
47 #include "readline/readline.h"
48
49 int
50 key_is_start_sequence (int ch)
51 {
52 return (ch == 27);
53 }
54
55 int
56 key_is_end_sequence (int ch)
57 {
58 return (ch == 126);
59 }
60
61 int
62 key_is_backspace (int ch)
63 {
64 return (ch == 8);
65 }
66
67 /* Use definition from readline 4.3. */
68 #undef CTRL_CHAR
69 #define CTRL_CHAR(c) \
70 ((c) < control_character_threshold && (((c) & 0x80) == 0))
71
72 /* This file controls the IO interactions between gdb and curses.
73 When the TUI is enabled, gdb has two modes a curses and a standard
74 mode.
75
76 In curses mode, the gdb outputs are made in a curses command
77 window. For this, the gdb_stdout and gdb_stderr are redirected to
78 the specific ui_file implemented by TUI. The output is handled by
79 tui_puts(). The input is also controlled by curses with
80 tui_getc(). The readline library uses this function to get its
81 input. Several readline hooks are installed to redirect readline
82 output to the TUI (see also the note below).
83
84 In normal mode, the gdb outputs are restored to their origin, that
85 is as if TUI is not used. Readline also uses its original getc()
86 function with stdin.
87
88 Note SCz/2001-07-21: the current readline is not clean in its
89 management of the output. Even if we install a redisplay handler,
90 it sometimes writes on a stdout file. It is important to redirect
91 every output produced by readline, otherwise the curses window will
92 be garbled. This is implemented with a pipe that TUI reads and
93 readline writes to. A gdb input handler is created so that reading
94 the pipe is handled automatically. This will probably not work on
95 non-Unix platforms. The best fix is to make readline clean enougth
96 so that is never write on stdout.
97
98 Note SCz/2002-09-01: we now use more readline hooks and it seems
99 that with them we don't need the pipe anymore (verified by creating
100 the pipe and closing its end so that write causes a SIGPIPE). The
101 old pipe code is still there and can be conditionally removed by
102 #undef TUI_USE_PIPE_FOR_READLINE. */
103
104 /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */
105 #ifdef HAVE_PIPE
106 #define TUI_USE_PIPE_FOR_READLINE
107 #endif
108 /* #undef TUI_USE_PIPE_FOR_READLINE */
109
110 /* TUI output files. */
111 static struct ui_file *tui_stdout;
112 static struct ui_file *tui_stderr;
113 struct ui_out *tui_out;
114
115 /* GDB output files in non-curses mode. */
116 static struct ui_file *tui_old_stdout;
117 static struct ui_file *tui_old_stderr;
118 cli_ui_out *tui_old_uiout;
119
120 /* Readline previous hooks. */
121 static rl_getc_func_t *tui_old_rl_getc_function;
122 static rl_voidfunc_t *tui_old_rl_redisplay_function;
123 static rl_vintfunc_t *tui_old_rl_prep_terminal;
124 static rl_voidfunc_t *tui_old_rl_deprep_terminal;
125 static rl_compdisp_func_t *tui_old_rl_display_matches_hook;
126 static int tui_old_rl_echoing_p;
127
128 /* Readline output stream.
129 Should be removed when readline is clean. */
130 static FILE *tui_rl_outstream;
131 static FILE *tui_old_rl_outstream;
132 #ifdef TUI_USE_PIPE_FOR_READLINE
133 static int tui_readline_pipe[2];
134 #endif
135
136 /* The last gdb prompt that was registered in readline.
137 This may be the main gdb prompt or a secondary prompt. */
138 static char *tui_rl_saved_prompt;
139
140 /* Print a character in the curses command window. The output is
141 buffered. It is up to the caller to refresh the screen if
142 necessary. */
143
144 static void
145 do_tui_putc (WINDOW *w, char c)
146 {
147 static int tui_skip_line = -1;
148
149 /* Catch annotation and discard them. We need two \032 and discard
150 until a \n is seen. */
151 if (c == '\032')
152 {
153 tui_skip_line++;
154 }
155 else if (tui_skip_line != 1)
156 {
157 tui_skip_line = -1;
158 /* Expand TABs, since ncurses on MS-Windows doesn't. */
159 if (c == '\t')
160 {
161 int col;
162
163 col = getcurx (w);
164 do
165 {
166 waddch (w, ' ');
167 col++;
168 }
169 while ((col % 8) != 0);
170 }
171 else
172 waddch (w, c);
173 }
174 else if (c == '\n')
175 tui_skip_line = -1;
176 }
177
178 /* Update the cached value of the command window's start line based on
179 the window's current Y coordinate. */
180
181 static void
182 update_cmdwin_start_line ()
183 {
184 TUI_CMD_WIN->detail.command_info.start_line
185 = getcury (TUI_CMD_WIN->generic.handle);
186 }
187
188 /* Print a character in the curses command window. The output is
189 buffered. It is up to the caller to refresh the screen if
190 necessary. */
191
192 static void
193 tui_putc (char c)
194 {
195 WINDOW *w = TUI_CMD_WIN->generic.handle;
196
197 do_tui_putc (w, c);
198 update_cmdwin_start_line ();
199 }
200
201 /* Print LENGTH characters from the buffer pointed to by BUF to the
202 curses command window. The output is buffered. It is up to the
203 caller to refresh the screen if necessary. */
204
205 void
206 tui_write (const char *buf, size_t length)
207 {
208 WINDOW *w = TUI_CMD_WIN->generic.handle;
209
210 for (size_t i = 0; i < length; i++)
211 do_tui_putc (w, buf[i]);
212 update_cmdwin_start_line ();
213 }
214
215 /* Print a string in the curses command window. The output is
216 buffered. It is up to the caller to refresh the screen if
217 necessary. */
218
219 void
220 tui_puts (const char *string)
221 {
222 WINDOW *w = TUI_CMD_WIN->generic.handle;
223 char c;
224
225 while ((c = *string++) != 0)
226 do_tui_putc (w, c);
227 update_cmdwin_start_line ();
228 }
229
230 /* Readline callback.
231 Redisplay the command line with its prompt after readline has
232 changed the edited text. */
233 void
234 tui_redisplay_readline (void)
235 {
236 int prev_col;
237 int height;
238 int col;
239 int c_pos;
240 int c_line;
241 int in;
242 WINDOW *w;
243 const char *prompt;
244 int start_line;
245
246 /* Detect when we temporarily left SingleKey and now the readline
247 edit buffer is empty, automatically restore the SingleKey
248 mode. The restore must only be done if the command has finished.
249 The command could call prompt_for_continue and we must not
250 restore SingleKey so that the prompt and normal keymap are used. */
251 if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0
252 && !gdb_in_secondary_prompt_p (current_ui))
253 tui_set_key_mode (TUI_SINGLE_KEY_MODE);
254
255 if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
256 prompt = "";
257 else
258 prompt = tui_rl_saved_prompt;
259
260 c_pos = -1;
261 c_line = -1;
262 w = TUI_CMD_WIN->generic.handle;
263 start_line = TUI_CMD_WIN->detail.command_info.start_line;
264 wmove (w, start_line, 0);
265 prev_col = 0;
266 height = 1;
267 for (in = 0; prompt && prompt[in]; in++)
268 {
269 waddch (w, prompt[in]);
270 col = getcurx (w);
271 if (col <= prev_col)
272 height++;
273 prev_col = col;
274 }
275 for (in = 0; in <= rl_end; in++)
276 {
277 unsigned char c;
278
279 if (in == rl_point)
280 {
281 getyx (w, c_line, c_pos);
282 }
283
284 if (in == rl_end)
285 break;
286
287 c = (unsigned char) rl_line_buffer[in];
288 if (CTRL_CHAR (c) || c == RUBOUT)
289 {
290 waddch (w, '^');
291 waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
292 }
293 else if (c == '\t')
294 {
295 /* Expand TABs, since ncurses on MS-Windows doesn't. */
296 col = getcurx (w);
297 do
298 {
299 waddch (w, ' ');
300 col++;
301 } while ((col % 8) != 0);
302 }
303 else
304 {
305 waddch (w, c);
306 }
307 if (c == '\n')
308 TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
309 col = getcurx (w);
310 if (col < prev_col)
311 height++;
312 prev_col = col;
313 }
314 wclrtobot (w);
315 TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
316 if (c_line >= 0)
317 wmove (w, c_line, c_pos);
318 TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
319
320 wrefresh (w);
321 fflush(stdout);
322 }
323
324 /* Readline callback to prepare the terminal. It is called once each
325 time we enter readline. Terminal is already setup in curses
326 mode. */
327 static void
328 tui_prep_terminal (int notused1)
329 {
330 /* Save the prompt registered in readline to correctly display it.
331 (we can't use gdb_prompt() due to secondary prompts and can't use
332 rl_prompt because it points to an alloca buffer). */
333 xfree (tui_rl_saved_prompt);
334 tui_rl_saved_prompt = rl_prompt != NULL ? xstrdup (rl_prompt) : NULL;
335 }
336
337 /* Readline callback to restore the terminal. It is called once each
338 time we leave readline. There is nothing to do in curses mode. */
339 static void
340 tui_deprep_terminal (void)
341 {
342 }
343
344 #ifdef TUI_USE_PIPE_FOR_READLINE
345 /* Read readline output pipe and feed the command window with it.
346 Should be removed when readline is clean. */
347 static void
348 tui_readline_output (int error, gdb_client_data data)
349 {
350 int size;
351 char buf[256];
352
353 size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
354 if (size > 0 && tui_active)
355 {
356 buf[size] = 0;
357 tui_puts (buf);
358 }
359 }
360 #endif
361
362 /* TUI version of displayer.crlf. */
363
364 static void
365 tui_mld_crlf (const struct match_list_displayer *displayer)
366 {
367 tui_putc ('\n');
368 }
369
370 /* TUI version of displayer.putch. */
371
372 static void
373 tui_mld_putch (const struct match_list_displayer *displayer, int ch)
374 {
375 tui_putc (ch);
376 }
377
378 /* TUI version of displayer.puts. */
379
380 static void
381 tui_mld_puts (const struct match_list_displayer *displayer, const char *s)
382 {
383 tui_puts (s);
384 }
385
386 /* TUI version of displayer.flush. */
387
388 static void
389 tui_mld_flush (const struct match_list_displayer *displayer)
390 {
391 wrefresh (TUI_CMD_WIN->generic.handle);
392 }
393
394 /* TUI version of displayer.erase_entire_line. */
395
396 static void
397 tui_mld_erase_entire_line (const struct match_list_displayer *displayer)
398 {
399 WINDOW *w = TUI_CMD_WIN->generic.handle;
400 int cur_y = getcury (w);
401
402 wmove (w, cur_y, 0);
403 wclrtoeol (w);
404 wmove (w, cur_y, 0);
405 }
406
407 /* TUI version of displayer.beep. */
408
409 static void
410 tui_mld_beep (const struct match_list_displayer *displayer)
411 {
412 beep ();
413 }
414
415 /* Helper function for tui_mld_read_key.
416 This temporarily replaces tui_getc for use during tab-completion
417 match list display. */
418
419 static int
420 tui_mld_getc (FILE *fp)
421 {
422 WINDOW *w = TUI_CMD_WIN->generic.handle;
423 int c = wgetch (w);
424
425 return c;
426 }
427
428 /* TUI version of displayer.read_key. */
429
430 static int
431 tui_mld_read_key (const struct match_list_displayer *displayer)
432 {
433 rl_getc_func_t *prev = rl_getc_function;
434 int c;
435
436 /* We can't use tui_getc as we need NEWLINE to not get emitted. */
437 rl_getc_function = tui_mld_getc;
438 c = rl_read_key ();
439 rl_getc_function = prev;
440 return c;
441 }
442
443 /* TUI version of rl_completion_display_matches_hook.
444 See gdb_display_match_list for a description of the arguments. */
445
446 static void
447 tui_rl_display_match_list (char **matches, int len, int max)
448 {
449 struct match_list_displayer displayer;
450
451 rl_get_screen_size (&displayer.height, &displayer.width);
452 displayer.crlf = tui_mld_crlf;
453 displayer.putch = tui_mld_putch;
454 displayer.puts = tui_mld_puts;
455 displayer.flush = tui_mld_flush;
456 displayer.erase_entire_line = tui_mld_erase_entire_line;
457 displayer.beep = tui_mld_beep;
458 displayer.read_key = tui_mld_read_key;
459
460 gdb_display_match_list (matches, len, max, &displayer);
461 }
462
463 /* Setup the IO for curses or non-curses mode.
464 - In non-curses mode, readline and gdb use the standard input and
465 standard output/error directly.
466 - In curses mode, the standard output/error is controlled by TUI
467 with the tui_stdout and tui_stderr. The output is redirected in
468 the curses command window. Several readline callbacks are installed
469 so that readline asks for its input to the curses command window
470 with wgetch(). */
471 void
472 tui_setup_io (int mode)
473 {
474 extern int _rl_echoing_p;
475
476 if (mode)
477 {
478 /* Redirect readline to TUI. */
479 tui_old_rl_redisplay_function = rl_redisplay_function;
480 tui_old_rl_deprep_terminal = rl_deprep_term_function;
481 tui_old_rl_prep_terminal = rl_prep_term_function;
482 tui_old_rl_getc_function = rl_getc_function;
483 tui_old_rl_display_matches_hook = rl_completion_display_matches_hook;
484 tui_old_rl_outstream = rl_outstream;
485 tui_old_rl_echoing_p = _rl_echoing_p;
486 rl_redisplay_function = tui_redisplay_readline;
487 rl_deprep_term_function = tui_deprep_terminal;
488 rl_prep_term_function = tui_prep_terminal;
489 rl_getc_function = tui_getc;
490 _rl_echoing_p = 0;
491 rl_outstream = tui_rl_outstream;
492 rl_prompt = 0;
493 rl_completion_display_matches_hook = tui_rl_display_match_list;
494 rl_already_prompted = 0;
495
496 /* Keep track of previous gdb output. */
497 tui_old_stdout = gdb_stdout;
498 tui_old_stderr = gdb_stderr;
499 tui_old_uiout = dynamic_cast<cli_ui_out *> (current_uiout);
500 gdb_assert (tui_old_uiout != nullptr);
501
502 /* Reconfigure gdb output. */
503 gdb_stdout = tui_stdout;
504 gdb_stderr = tui_stderr;
505 gdb_stdlog = gdb_stdout; /* for moment */
506 gdb_stdtarg = gdb_stderr; /* for moment */
507 gdb_stdtargerr = gdb_stderr; /* for moment */
508 current_uiout = tui_out;
509
510 /* Save tty for SIGCONT. */
511 savetty ();
512 }
513 else
514 {
515 /* Restore gdb output. */
516 gdb_stdout = tui_old_stdout;
517 gdb_stderr = tui_old_stderr;
518 gdb_stdlog = gdb_stdout; /* for moment */
519 gdb_stdtarg = gdb_stderr; /* for moment */
520 gdb_stdtargerr = gdb_stderr; /* for moment */
521 current_uiout = tui_old_uiout;
522
523 /* Restore readline. */
524 rl_redisplay_function = tui_old_rl_redisplay_function;
525 rl_deprep_term_function = tui_old_rl_deprep_terminal;
526 rl_prep_term_function = tui_old_rl_prep_terminal;
527 rl_getc_function = tui_old_rl_getc_function;
528 rl_completion_display_matches_hook = tui_old_rl_display_matches_hook;
529 rl_outstream = tui_old_rl_outstream;
530 _rl_echoing_p = tui_old_rl_echoing_p;
531 rl_already_prompted = 0;
532
533 /* Save tty for SIGCONT. */
534 savetty ();
535 }
536 }
537
538 #ifdef SIGCONT
539 /* Catch SIGCONT to restore the terminal and refresh the screen. */
540 static void
541 tui_cont_sig (int sig)
542 {
543 if (tui_active)
544 {
545 /* Restore the terminal setting because another process (shell)
546 might have changed it. */
547 resetty ();
548
549 /* Force a refresh of the screen. */
550 tui_refresh_all_win ();
551
552 wrefresh (TUI_CMD_WIN->generic.handle);
553 }
554 signal (sig, tui_cont_sig);
555 }
556 #endif
557
558 /* Initialize the IO for gdb in curses mode. */
559 void
560 tui_initialize_io (void)
561 {
562 #ifdef SIGCONT
563 signal (SIGCONT, tui_cont_sig);
564 #endif
565
566 /* Create tui output streams. */
567 tui_stdout = new tui_file (stdout);
568 tui_stderr = new tui_file (stderr);
569 tui_out = tui_out_new (tui_stdout);
570
571 /* Create the default UI. */
572 tui_old_uiout = cli_out_new (gdb_stdout);
573
574 #ifdef TUI_USE_PIPE_FOR_READLINE
575 /* Temporary solution for readline writing to stdout: redirect
576 readline output in a pipe, read that pipe and output the content
577 in the curses command window. */
578 if (gdb_pipe_cloexec (tui_readline_pipe) != 0)
579 error (_("Cannot create pipe for readline"));
580
581 tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
582 if (tui_rl_outstream == 0)
583 error (_("Cannot redirect readline output"));
584
585 setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
586
587 #ifdef O_NONBLOCK
588 (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
589 #else
590 #ifdef O_NDELAY
591 (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
592 #endif
593 #endif
594 add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
595 #else
596 tui_rl_outstream = stdout;
597 #endif
598 }
599
600 /* Get a character from the command window. This is called from the
601 readline package. */
602 int
603 tui_getc (FILE *fp)
604 {
605 int ch;
606 WINDOW *w;
607
608 w = TUI_CMD_WIN->generic.handle;
609
610 #ifdef TUI_USE_PIPE_FOR_READLINE
611 /* Flush readline output. */
612 tui_readline_output (0, 0);
613 #endif
614
615 ch = wgetch (w);
616
617 /* The \n must be echoed because it will not be printed by
618 readline. */
619 if (ch == '\n')
620 {
621 /* When hitting return with an empty input, gdb executes the last
622 command. If we emit a newline, this fills up the command window
623 with empty lines with gdb prompt at beginning. Instead of that,
624 stay on the same line but provide a visual effect to show the
625 user we recognized the command. */
626 if (rl_end == 0 && !gdb_in_secondary_prompt_p (current_ui))
627 {
628 wmove (w, getcury (w), 0);
629
630 /* Clear the line. This will blink the gdb prompt since
631 it will be redrawn at the same line. */
632 wclrtoeol (w);
633 wrefresh (w);
634 napms (20);
635 }
636 else
637 {
638 /* Move cursor to the end of the command line before emitting the
639 newline. We need to do so because when ncurses outputs a newline
640 it truncates any text that appears past the end of the cursor. */
641 int px, py;
642 getyx (w, py, px);
643 px += rl_end - rl_point;
644 py += px / TUI_CMD_WIN->generic.width;
645 px %= TUI_CMD_WIN->generic.width;
646 wmove (w, py, px);
647 tui_putc ('\n');
648 }
649 }
650
651 /* Handle prev/next/up/down here. */
652 ch = tui_dispatch_ctrl_char (ch);
653
654 if (ch == KEY_BACKSPACE)
655 return '\b';
656
657 if (current_ui->command_editing && key_is_start_sequence (ch))
658 {
659 int ch_pending;
660
661 nodelay (w, TRUE);
662 ch_pending = wgetch (w);
663 nodelay (w, FALSE);
664
665 /* If we have pending input following a start sequence, call the stdin
666 event handler again because ncurses may have already read and stored
667 the input into its internal buffer, meaning that we won't get an stdin
668 event for it. If we don't compensate for this missed stdin event, key
669 sequences as Alt_F (^[f) will not behave promptly.
670
671 (We only compensates for the missed 2nd byte of a key sequence because
672 2-byte sequences are by far the most commonly used. ncurses may have
673 buffered a larger, 3+-byte key sequence though it remains to be seen
674 whether it is useful to compensate for all the bytes of such
675 sequences.) */
676 if (ch_pending != ERR)
677 {
678 ungetch (ch_pending);
679 call_stdin_event_handler_again_p = 1;
680 }
681 }
682
683 return ch;
684 }
685
686 /* Utility function to expand TABs in a STRING into spaces. STRING
687 will be displayed starting at column COL, and is assumed to include
688 no newlines. The returned expanded string is malloc'ed. */
689
690 char *
691 tui_expand_tabs (const char *string, int col)
692 {
693 int n_adjust, ncol;
694 const char *s;
695 char *ret, *q;
696
697 /* 1. How many additional characters do we need? */
698 for (ncol = col, n_adjust = 0, s = string; s; )
699 {
700 s = strpbrk (s, "\t");
701 if (s)
702 {
703 ncol += (s - string) + n_adjust;
704 /* Adjustment for the next tab stop, minus one for the TAB
705 we replace with spaces. */
706 n_adjust += 8 - (ncol % 8) - 1;
707 s++;
708 }
709 }
710
711 /* Allocate the copy. */
712 ret = q = (char *) xmalloc (strlen (string) + n_adjust + 1);
713
714 /* 2. Copy the original string while replacing TABs with spaces. */
715 for (ncol = col, s = string; s; )
716 {
717 const char *s1 = strpbrk (s, "\t");
718 if (s1)
719 {
720 if (s1 > s)
721 {
722 strncpy (q, s, s1 - s);
723 q += s1 - s;
724 ncol += s1 - s;
725 }
726 do {
727 *q++ = ' ';
728 ncol++;
729 } while ((ncol % 8) != 0);
730 s1++;
731 }
732 else
733 strcpy (q, s);
734 s = s1;
735 }
736
737 return ret;
738 }
top.h
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static FILE * tui_rl_outstream
Definition: tui-io.c:130
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