1 /* TUI support I/O functions.
3 Copyright (C) 1998-2015 Free Software Foundation, Inc.
5 Contributed by Hewlett-Packard Company.
7 This file is part of GDB.
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.
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.
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/>. */
24 #include "event-loop.h"
25 #include "event-top.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"
39 #include "filestuff.h"
40 #include "completer.h"
41 #include "gdb_curses.h"
43 /* This redefines CTRL if it is not already defined, so it must come
44 after terminal state releated include files like <term.h> and
46 #include "readline/readline.h"
49 key_is_start_sequence (int ch)
55 key_is_end_sequence (int ch)
61 key_is_backspace (int ch)
66 /* Use definition from readline 4.3. */
68 #define CTRL_CHAR(c) \
69 ((c) < control_character_threshold && (((c) & 0x80) == 0))
71 /* This file controls the IO interactions between gdb and curses.
72 When the TUI is enabled, gdb has two modes a curses and a standard
75 In curses mode, the gdb outputs are made in a curses command
76 window. For this, the gdb_stdout and gdb_stderr are redirected to
77 the specific ui_file implemented by TUI. The output is handled by
78 tui_puts(). The input is also controlled by curses with
79 tui_getc(). The readline library uses this function to get its
80 input. Several readline hooks are installed to redirect readline
81 output to the TUI (see also the note below).
83 In normal mode, the gdb outputs are restored to their origin, that
84 is as if TUI is not used. Readline also uses its original getc()
87 Note SCz/2001-07-21: the current readline is not clean in its
88 management of the output. Even if we install a redisplay handler,
89 it sometimes writes on a stdout file. It is important to redirect
90 every output produced by readline, otherwise the curses window will
91 be garbled. This is implemented with a pipe that TUI reads and
92 readline writes to. A gdb input handler is created so that reading
93 the pipe is handled automatically. This will probably not work on
94 non-Unix platforms. The best fix is to make readline clean enougth
95 so that is never write on stdout.
97 Note SCz/2002-09-01: we now use more readline hooks and it seems
98 that with them we don't need the pipe anymore (verified by creating
99 the pipe and closing its end so that write causes a SIGPIPE). The
100 old pipe code is still there and can be conditionally removed by
101 #undef TUI_USE_PIPE_FOR_READLINE. */
103 /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */
105 #define TUI_USE_PIPE_FOR_READLINE
107 /* #undef TUI_USE_PIPE_FOR_READLINE */
109 /* TUI output files. */
110 static struct ui_file *tui_stdout;
111 static struct ui_file *tui_stderr;
112 struct ui_out *tui_out;
114 /* GDB output files in non-curses mode. */
115 static struct ui_file *tui_old_stdout;
116 static struct ui_file *tui_old_stderr;
117 struct ui_out *tui_old_uiout;
119 /* Readline previous hooks. */
120 static rl_getc_func_t *tui_old_rl_getc_function;
121 static rl_voidfunc_t *tui_old_rl_redisplay_function;
122 static rl_vintfunc_t *tui_old_rl_prep_terminal;
123 static rl_voidfunc_t *tui_old_rl_deprep_terminal;
124 static rl_compdisp_func_t *tui_old_rl_display_matches_hook;
125 static int tui_old_rl_echoing_p;
127 /* Readline output stream.
128 Should be removed when readline is clean. */
129 static FILE *tui_rl_outstream;
130 static FILE *tui_old_rl_outstream;
131 #ifdef TUI_USE_PIPE_FOR_READLINE
132 static int tui_readline_pipe[2];
135 /* The last gdb prompt that was registered in readline.
136 This may be the main gdb prompt or a secondary prompt. */
137 static char *tui_rl_saved_prompt;
149 /* Print the string in the curses command window.
150 The output is buffered. It is up to the caller to refresh the screen
154 tui_puts (const char *string)
156 static int tui_skip_line = -1;
160 w = TUI_CMD_WIN->generic.handle;
161 while ((c = *string++) != 0)
163 /* Catch annotation and discard them. We need two \032 and
164 discard until a \n is seen. */
169 else if (tui_skip_line != 1)
172 /* Expand TABs, since ncurses on MS-Windows doesn't. */
177 getyx (w, line, col);
182 } while ((col % 8) != 0);
190 TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
193 /* Readline callback.
194 Redisplay the command line with its prompt after readline has
195 changed the edited text. */
197 tui_redisplay_readline (void)
209 /* Detect when we temporarily left SingleKey and now the readline
210 edit buffer is empty, automatically restore the SingleKey
211 mode. The restore must only be done if the command has finished.
212 The command could call prompt_for_continue and we must not
213 restore SingleKey so that the prompt and normal keymap are used. */
214 if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0
215 && immediate_quit == 0)
216 tui_set_key_mode (TUI_SINGLE_KEY_MODE);
218 if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
221 prompt = tui_rl_saved_prompt;
225 w = TUI_CMD_WIN->generic.handle;
226 start_line = TUI_CMD_WIN->detail.command_info.start_line;
227 wmove (w, start_line, 0);
230 for (in = 0; prompt && prompt[in]; in++)
232 waddch (w, prompt[in]);
233 getyx (w, line, col);
238 for (in = 0; in <= rl_end; in++)
244 getyx (w, c_line, c_pos);
250 c = (unsigned char) rl_line_buffer[in];
251 if (CTRL_CHAR (c) || c == RUBOUT)
254 waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
258 /* Expand TABs, since ncurses on MS-Windows doesn't. */
259 getyx (w, line, col);
264 } while ((col % 8) != 0);
271 TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
272 getyx (w, line, col);
278 TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
280 wmove (w, c_line, c_pos);
281 TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
287 /* Readline callback to prepare the terminal. It is called once each
288 time we enter readline. Terminal is already setup in curses
291 tui_prep_terminal (int notused1)
293 /* Save the prompt registered in readline to correctly display it.
294 (we can't use gdb_prompt() due to secondary prompts and can't use
295 rl_prompt because it points to an alloca buffer). */
296 xfree (tui_rl_saved_prompt);
297 tui_rl_saved_prompt = rl_prompt != NULL ? xstrdup (rl_prompt) : NULL;
300 /* Readline callback to restore the terminal. It is called once each
301 time we leave readline. There is nothing to do in curses mode. */
303 tui_deprep_terminal (void)
307 #ifdef TUI_USE_PIPE_FOR_READLINE
308 /* Read readline output pipe and feed the command window with it.
309 Should be removed when readline is clean. */
311 tui_readline_output (int error, gdb_client_data data)
316 size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
317 if (size > 0 && tui_active)
325 /* TUI version of displayer.crlf. */
328 tui_mld_crlf (const struct match_list_displayer *displayer)
333 /* TUI version of displayer.putch. */
336 tui_mld_putch (const struct match_list_displayer *displayer, int ch)
341 /* TUI version of displayer.puts. */
344 tui_mld_puts (const struct match_list_displayer *displayer, const char *s)
349 /* TUI version of displayer.flush. */
352 tui_mld_flush (const struct match_list_displayer *displayer)
354 wrefresh (TUI_CMD_WIN->generic.handle);
357 /* TUI version of displayer.erase_entire_line. */
360 tui_mld_erase_entire_line (const struct match_list_displayer *displayer)
362 WINDOW *w = TUI_CMD_WIN->generic.handle;
363 int cur_y = getcury (w);
370 /* TUI version of displayer.beep. */
373 tui_mld_beep (const struct match_list_displayer *displayer)
378 /* Helper function for tui_mld_read_key.
379 This temporarily replaces tui_getc for use during tab-completion
380 match list display. */
383 tui_mld_getc (FILE *fp)
385 WINDOW *w = TUI_CMD_WIN->generic.handle;
391 /* TUI version of displayer.read_key. */
394 tui_mld_read_key (const struct match_list_displayer *displayer)
396 rl_getc_func_t *prev = rl_getc_function;
399 /* We can't use tui_getc as we need NEWLINE to not get emitted. */
400 rl_getc_function = tui_mld_getc;
402 rl_getc_function = prev;
406 /* TUI version of rl_completion_display_matches_hook.
407 See gdb_display_match_list for a description of the arguments. */
410 tui_rl_display_match_list (char **matches, int len, int max)
412 struct match_list_displayer displayer;
414 rl_get_screen_size (&displayer.height, &displayer.width);
415 displayer.crlf = tui_mld_crlf;
416 displayer.putch = tui_mld_putch;
417 displayer.puts = tui_mld_puts;
418 displayer.flush = tui_mld_flush;
419 displayer.erase_entire_line = tui_mld_erase_entire_line;
420 displayer.beep = tui_mld_beep;
421 displayer.read_key = tui_mld_read_key;
423 gdb_display_match_list (matches, len, max, &displayer);
426 /* Setup the IO for curses or non-curses mode.
427 - In non-curses mode, readline and gdb use the standard input and
428 standard output/error directly.
429 - In curses mode, the standard output/error is controlled by TUI
430 with the tui_stdout and tui_stderr. The output is redirected in
431 the curses command window. Several readline callbacks are installed
432 so that readline asks for its input to the curses command window
435 tui_setup_io (int mode)
437 extern int _rl_echoing_p;
441 /* Redirect readline to TUI. */
442 tui_old_rl_redisplay_function = rl_redisplay_function;
443 tui_old_rl_deprep_terminal = rl_deprep_term_function;
444 tui_old_rl_prep_terminal = rl_prep_term_function;
445 tui_old_rl_getc_function = rl_getc_function;
446 tui_old_rl_display_matches_hook = rl_completion_display_matches_hook;
447 tui_old_rl_outstream = rl_outstream;
448 tui_old_rl_echoing_p = _rl_echoing_p;
449 rl_redisplay_function = tui_redisplay_readline;
450 rl_deprep_term_function = tui_deprep_terminal;
451 rl_prep_term_function = tui_prep_terminal;
452 rl_getc_function = tui_getc;
454 rl_outstream = tui_rl_outstream;
456 rl_completion_display_matches_hook = tui_rl_display_match_list;
457 rl_already_prompted = 0;
459 /* Keep track of previous gdb output. */
460 tui_old_stdout = gdb_stdout;
461 tui_old_stderr = gdb_stderr;
462 tui_old_uiout = current_uiout;
464 /* Reconfigure gdb output. */
465 gdb_stdout = tui_stdout;
466 gdb_stderr = tui_stderr;
467 gdb_stdlog = gdb_stdout; /* for moment */
468 gdb_stdtarg = gdb_stderr; /* for moment */
469 gdb_stdtargerr = gdb_stderr; /* for moment */
470 current_uiout = tui_out;
472 /* Save tty for SIGCONT. */
477 /* Restore gdb output. */
478 gdb_stdout = tui_old_stdout;
479 gdb_stderr = tui_old_stderr;
480 gdb_stdlog = gdb_stdout; /* for moment */
481 gdb_stdtarg = gdb_stderr; /* for moment */
482 gdb_stdtargerr = gdb_stderr; /* for moment */
483 current_uiout = tui_old_uiout;
485 /* Restore readline. */
486 rl_redisplay_function = tui_old_rl_redisplay_function;
487 rl_deprep_term_function = tui_old_rl_deprep_terminal;
488 rl_prep_term_function = tui_old_rl_prep_terminal;
489 rl_getc_function = tui_old_rl_getc_function;
490 rl_completion_display_matches_hook = tui_old_rl_display_matches_hook;
491 rl_outstream = tui_old_rl_outstream;
492 _rl_echoing_p = tui_old_rl_echoing_p;
493 rl_already_prompted = 0;
495 /* Save tty for SIGCONT. */
501 /* Catch SIGCONT to restore the terminal and refresh the screen. */
503 tui_cont_sig (int sig)
507 /* Restore the terminal setting because another process (shell)
508 might have changed it. */
511 /* Force a refresh of the screen. */
512 tui_refresh_all_win ();
514 wrefresh (TUI_CMD_WIN->generic.handle);
516 signal (sig, tui_cont_sig);
520 /* Initialize the IO for gdb in curses mode. */
522 tui_initialize_io (void)
525 signal (SIGCONT, tui_cont_sig);
528 /* Create tui output streams. */
529 tui_stdout = tui_fileopen (stdout);
530 tui_stderr = tui_fileopen (stderr);
531 tui_out = tui_out_new (tui_stdout);
533 /* Create the default UI. */
534 tui_old_uiout = cli_out_new (gdb_stdout);
536 #ifdef TUI_USE_PIPE_FOR_READLINE
537 /* Temporary solution for readline writing to stdout: redirect
538 readline output in a pipe, read that pipe and output the content
539 in the curses command window. */
540 if (gdb_pipe_cloexec (tui_readline_pipe) != 0)
541 error (_("Cannot create pipe for readline"));
543 tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
544 if (tui_rl_outstream == 0)
545 error (_("Cannot redirect readline output"));
547 setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
550 (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
553 (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
556 add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
558 tui_rl_outstream = stdout;
562 /* Get a character from the command window. This is called from the
570 w = TUI_CMD_WIN->generic.handle;
572 #ifdef TUI_USE_PIPE_FOR_READLINE
573 /* Flush readline output. */
574 tui_readline_output (0, 0);
579 /* The \n must be echoed because it will not be printed by
583 /* When hitting return with an empty input, gdb executes the last
584 command. If we emit a newline, this fills up the command window
585 with empty lines with gdb prompt at beginning. Instead of that,
586 stay on the same line but provide a visual effect to show the
587 user we recognized the command. */
588 if (rl_end == 0 && !gdb_in_secondary_prompt_p ())
590 wmove (w, getcury (w), 0);
592 /* Clear the line. This will blink the gdb prompt since
593 it will be redrawn at the same line. */
600 /* Move cursor to the end of the command line before emitting the
601 newline. We need to do so because when ncurses outputs a newline
602 it truncates any text that appears past the end of the cursor. */
605 px += rl_end - rl_point;
606 py += px / TUI_CMD_WIN->generic.width;
607 px %= TUI_CMD_WIN->generic.width;
613 /* Handle prev/next/up/down here. */
614 ch = tui_dispatch_ctrl_char (ch);
616 if (ch == KEY_BACKSPACE)
619 if (async_command_editing_p && key_is_start_sequence (ch))
624 ch_pending = wgetch (w);
627 /* If we have pending input following a start sequence, call the stdin
628 event handler again because ncurses may have already read and stored
629 the input into its internal buffer, meaning that we won't get an stdin
630 event for it. If we don't compensate for this missed stdin event, key
631 sequences as Alt_F (^[f) will not behave promptly.
633 (We only compensates for the missed 2nd byte of a key sequence because
634 2-byte sequences are by far the most commonly used. ncurses may have
635 buffered a larger, 3+-byte key sequence though it remains to be seen
636 whether it is useful to compensate for all the bytes of such
638 if (ch_pending != ERR)
640 ungetch (ch_pending);
641 call_stdin_event_handler_again_p = 1;
648 /* Utility function to expand TABs in a STRING into spaces. STRING
649 will be displayed starting at column COL, and is assumed to include
650 no newlines. The returned expanded string is malloc'ed. */
653 tui_expand_tabs (const char *string, int col)
659 /* 1. How many additional characters do we need? */
660 for (ncol = col, n_adjust = 0, s = string; s; )
662 s = strpbrk (s, "\t");
665 ncol += (s - string) + n_adjust;
666 /* Adjustment for the next tab stop, minus one for the TAB
667 we replace with spaces. */
668 n_adjust += 8 - (ncol % 8) - 1;
673 /* Allocate the copy. */
674 ret = q = xmalloc (strlen (string) + n_adjust + 1);
676 /* 2. Copy the original string while replacing TABs with spaces. */
677 for (ncol = col, s = string; s; )
679 const char *s1 = strpbrk (s, "\t");
684 strncpy (q, s, s1 - s);
691 } while ((ncol % 8) != 0);