1 /* TUI support I/O functions.
3 Copyright (C) 1998-2021 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 "gdbsupport/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"
35 #include "tui/tui-out.h"
43 #include "gdbsupport/filestuff.h"
44 #include "completer.h"
45 #include "gdb_curses.h"
48 /* This redefines CTRL if it is not already defined, so it must come
49 after terminal state releated include files like <term.h> and
51 #include "readline/readline.h"
54 static SHORT ncurses_norm_attr
;
57 static int tui_getc (FILE *fp
);
60 key_is_start_sequence (int ch
)
65 /* Use definition from readline 4.3. */
67 #define CTRL_CHAR(c) \
68 ((c) < control_character_threshold && (((c) & 0x80) == 0))
70 /* This file controls the IO interactions between gdb and curses.
71 When the TUI is enabled, gdb has two modes a curses and a standard
74 In curses mode, the gdb outputs are made in a curses command
75 window. For this, the gdb_stdout and gdb_stderr are redirected to
76 the specific ui_file implemented by TUI. The output is handled by
77 tui_puts(). The input is also controlled by curses with
78 tui_getc(). The readline library uses this function to get its
79 input. Several readline hooks are installed to redirect readline
80 output to the TUI (see also the note below).
82 In normal mode, the gdb outputs are restored to their origin, that
83 is as if TUI is not used. Readline also uses its original getc()
86 Note SCz/2001-07-21: the current readline is not clean in its
87 management of the output. Even if we install a redisplay handler,
88 it sometimes writes on a stdout file. It is important to redirect
89 every output produced by readline, otherwise the curses window will
90 be garbled. This is implemented with a pipe that TUI reads and
91 readline writes to. A gdb input handler is created so that reading
92 the pipe is handled automatically. This will probably not work on
93 non-Unix platforms. The best fix is to make readline clean enough
94 so that is never write on stdout.
96 Note SCz/2002-09-01: we now use more readline hooks and it seems
97 that with them we don't need the pipe anymore (verified by creating
98 the pipe and closing its end so that write causes a SIGPIPE). The
99 old pipe code is still there and can be conditionally removed by
100 #undef TUI_USE_PIPE_FOR_READLINE. */
102 /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */
104 #define TUI_USE_PIPE_FOR_READLINE
106 /* #undef TUI_USE_PIPE_FOR_READLINE */
108 /* TUI output files. */
109 static struct ui_file
*tui_stdout
;
110 static struct ui_file
*tui_stderr
;
111 struct ui_out
*tui_out
;
113 /* GDB output files in non-curses mode. */
114 static struct ui_file
*tui_old_stdout
;
115 static struct ui_file
*tui_old_stderr
;
116 cli_ui_out
*tui_old_uiout
;
118 /* Readline previous hooks. */
119 static rl_getc_func_t
*tui_old_rl_getc_function
;
120 static rl_voidfunc_t
*tui_old_rl_redisplay_function
;
121 static rl_vintfunc_t
*tui_old_rl_prep_terminal
;
122 static rl_voidfunc_t
*tui_old_rl_deprep_terminal
;
123 static rl_compdisp_func_t
*tui_old_rl_display_matches_hook
;
124 static int tui_old_rl_echoing_p
;
126 /* Readline output stream.
127 Should be removed when readline is clean. */
128 static FILE *tui_rl_outstream
;
129 static FILE *tui_old_rl_outstream
;
130 #ifdef TUI_USE_PIPE_FOR_READLINE
131 static int tui_readline_pipe
[2];
134 /* Print a character in the curses command window. The output is
135 buffered. It is up to the caller to refresh the screen if
139 do_tui_putc (WINDOW
*w
, char c
)
141 /* Expand TABs, since ncurses on MS-Windows doesn't. */
152 while ((col
% 8) != 0);
158 /* Update the cached value of the command window's start line based on
159 the window's current Y coordinate. */
162 update_cmdwin_start_line ()
164 TUI_CMD_WIN
->start_line
= getcury (TUI_CMD_WIN
->handle
.get ());
167 /* Print a character in the curses command window. The output is
168 buffered. It is up to the caller to refresh the screen if
174 do_tui_putc (TUI_CMD_WIN
->handle
.get (), c
);
175 update_cmdwin_start_line ();
178 /* This maps colors to their corresponding color index. */
180 static std::map
<ui_file_style::color
, int> color_map
;
182 /* This holds a pair of colors and is used to track the mapping
183 between a color pair index and the actual colors. */
190 bool operator< (const color_pair
&o
) const
192 return fg
< o
.fg
|| (fg
== o
.fg
&& bg
< o
.bg
);
196 /* This maps pairs of colors to their corresponding color pair
199 static std::map
<color_pair
, int> color_pair_map
;
201 /* This is indexed by ANSI color offset from the base color, and holds
202 the corresponding curses color constant. */
204 static const int curses_colors
[] = {
215 /* Given a color, find its index. */
218 get_color (const ui_file_style::color
&color
, int *result
)
220 if (color
.is_none ())
222 else if (color
.is_basic ())
223 *result
= curses_colors
[color
.get_value ()];
226 auto it
= color_map
.find (color
);
227 if (it
== color_map
.end ())
229 /* The first 8 colors are standard. */
230 int next
= color_map
.size () + 8;
235 /* We store RGB as 0..255, but curses wants 0..1000. */
236 if (init_color (next
, rgb
[0] * 1000 / 255, rgb
[1] * 1000 / 255,
237 rgb
[2] * 1000 / 255) == ERR
)
239 color_map
[color
] = next
;
243 *result
= it
->second
;
248 /* The most recently emitted color pair. */
250 static int last_color_pair
= -1;
252 /* The most recently applied style. */
254 static ui_file_style last_style
;
256 /* If true, we're highlighting the current source line in reverse
258 static bool reverse_mode_p
= false;
260 /* The background/foreground colors before we entered reverse
262 static ui_file_style::color
reverse_save_bg (ui_file_style::NONE
);
263 static ui_file_style::color
reverse_save_fg (ui_file_style::NONE
);
265 /* Given two colors, return their color pair index; making a new one
269 get_color_pair (int fg
, int bg
)
271 color_pair c
= { fg
, bg
};
272 auto it
= color_pair_map
.find (c
);
273 if (it
== color_pair_map
.end ())
275 /* Color pair 0 is our default color, so new colors start at
277 int next
= color_pair_map
.size () + 1;
278 /* Curses has a limited number of available color pairs. Fall
279 back to the default if we've used too many. */
280 if (next
>= COLOR_PAIRS
)
282 init_pair (next
, fg
, bg
);
283 color_pair_map
[c
] = next
;
289 /* Apply STYLE to W. */
292 tui_apply_style (WINDOW
*w
, ui_file_style style
)
295 wattron (w
, A_NORMAL
);
296 wattroff (w
, A_BOLD
);
298 wattroff (w
, A_REVERSE
);
299 if (last_color_pair
!= -1)
300 wattroff (w
, COLOR_PAIR (last_color_pair
));
301 wattron (w
, COLOR_PAIR (0));
303 const ui_file_style::color
&fg
= style
.get_foreground ();
304 const ui_file_style::color
&bg
= style
.get_background ();
305 if (!fg
.is_none () || !bg
.is_none ())
308 if (get_color (fg
, &fgi
) && get_color (bg
, &bgi
))
311 /* MS-Windows port of ncurses doesn't support implicit
312 default foreground and background colors, so we must
313 specify them explicitly when needed, using the colors we
316 fgi
= ncurses_norm_attr
& 15;
318 bgi
= (ncurses_norm_attr
>> 4) & 15;
320 int pair
= get_color_pair (fgi
, bgi
);
321 if (last_color_pair
!= -1)
322 wattroff (w
, COLOR_PAIR (last_color_pair
));
323 wattron (w
, COLOR_PAIR (pair
));
324 last_color_pair
= pair
;
328 switch (style
.get_intensity ())
330 case ui_file_style::NORMAL
:
333 case ui_file_style::BOLD
:
337 case ui_file_style::DIM
:
342 gdb_assert_not_reached ("invalid intensity");
345 if (style
.is_reverse ())
346 wattron (w
, A_REVERSE
);
351 /* Apply an ANSI escape sequence from BUF to W. BUF must start with
352 the ESC character. If BUF does not start with an ANSI escape,
353 return 0. Otherwise, apply the sequence if it is recognized, or
354 simply ignore it if not. In this case, the number of bytes read
355 from BUF is returned. */
358 apply_ansi_escape (WINDOW
*w
, const char *buf
)
360 ui_file_style style
= last_style
;
363 if (!style
.parse (buf
, &n_read
))
368 /* We want to reverse _only_ the default foreground/background
369 colors. If the foreground color is not the default (because
370 the text was styled), we want to leave it as is. If e.g.,
371 the terminal is fg=BLACK, and bg=WHITE, and the style wants
372 to print text in RED, we want to reverse the background color
373 (print in BLACK), but still print the text in RED. To do
374 that, we enable the A_REVERSE attribute, and re-reverse the
375 parsed-style's fb/bg colors.
377 Notes on the approach:
379 - there's no portable way to know which colors the default
382 - this approach does the right thing even if you change the
383 terminal colors while GDB is running -- the reversed
384 colors automatically adapt.
386 if (!style
.is_default ())
388 ui_file_style::color bg
= style
.get_background ();
389 ui_file_style::color fg
= style
.get_foreground ();
394 /* Enable A_REVERSE. */
395 style
.set_reverse (true);
398 tui_apply_style (w
, style
);
405 tui_set_reverse_mode (WINDOW
*w
, bool reverse
)
407 ui_file_style style
= last_style
;
409 reverse_mode_p
= reverse
;
410 style
.set_reverse (reverse
);
414 reverse_save_bg
= style
.get_background ();
415 reverse_save_fg
= style
.get_foreground ();
419 style
.set_bg (reverse_save_bg
);
420 style
.set_fg (reverse_save_fg
);
423 tui_apply_style (w
, style
);
426 /* Print LENGTH characters from the buffer pointed to by BUF to the
427 curses command window. The output is buffered. It is up to the
428 caller to refresh the screen if necessary. */
431 tui_write (const char *buf
, size_t length
)
433 /* We need this to be \0-terminated for the regexp matching. */
434 std::string
copy (buf
, length
);
435 tui_puts (copy
.c_str ());
438 /* Print a string in the curses command window. The output is
439 buffered. It is up to the caller to refresh the screen if
443 tui_puts (const char *string
, WINDOW
*w
)
446 w
= TUI_CMD_WIN
->handle
.get ();
450 const char *next
= strpbrk (string
, "\n\1\2\033\t");
452 /* Print the plain text prefix. */
453 size_t n_chars
= next
== nullptr ? strlen (string
) : next
- string
;
455 waddnstr (w
, string
, n_chars
);
466 /* Ignore these, they are readline escape-marking
479 size_t bytes_read
= apply_ansi_escape (w
, next
);
484 /* Just drop the escape. */
491 gdb_assert_not_reached ("missing case in tui_puts");
497 if (TUI_CMD_WIN
!= nullptr && w
== TUI_CMD_WIN
->handle
.get ())
498 update_cmdwin_start_line ();
502 tui_puts_internal (WINDOW
*w
, const char *string
, int *height
)
508 while ((c
= *string
++) != 0)
513 if (c
== '\1' || c
== '\2')
515 /* Ignore these, they are readline escape-marking
522 size_t bytes_read
= apply_ansi_escape (w
, string
- 1);
525 string
= string
+ bytes_read
- 1;
531 if (height
!= nullptr)
533 int col
= getcurx (w
);
540 if (TUI_CMD_WIN
!= nullptr && w
== TUI_CMD_WIN
->handle
.get ())
541 update_cmdwin_start_line ();
546 /* Readline callback.
547 Redisplay the command line with its prompt after readline has
548 changed the edited text. */
550 tui_redisplay_readline (void)
562 /* Detect when we temporarily left SingleKey and now the readline
563 edit buffer is empty, automatically restore the SingleKey
564 mode. The restore must only be done if the command has finished.
565 The command could call prompt_for_continue and we must not
566 restore SingleKey so that the prompt and normal keymap are used. */
567 if (tui_current_key_mode
== TUI_ONE_COMMAND_MODE
&& rl_end
== 0
568 && !gdb_in_secondary_prompt_p (current_ui
))
569 tui_set_key_mode (TUI_SINGLE_KEY_MODE
);
571 if (tui_current_key_mode
== TUI_SINGLE_KEY_MODE
)
574 prompt
= rl_display_prompt
;
578 w
= TUI_CMD_WIN
->handle
.get ();
579 start_line
= TUI_CMD_WIN
->start_line
;
580 wmove (w
, start_line
, 0);
583 if (prompt
!= nullptr)
584 tui_puts_internal (w
, prompt
, &height
);
586 prev_col
= getcurx (w
);
587 for (in
= 0; in
<= rl_end
; in
++)
593 getyx (w
, c_line
, c_pos
);
599 c
= (unsigned char) rl_line_buffer
[in
];
600 if (CTRL_CHAR (c
) || c
== RUBOUT
)
603 waddch (w
, CTRL_CHAR (c
) ? UNCTRL (c
) : '?');
607 /* Expand TABs, since ncurses on MS-Windows doesn't. */
613 } while ((col
% 8) != 0);
620 TUI_CMD_WIN
->start_line
= getcury (w
);
627 TUI_CMD_WIN
->start_line
= getcury (w
);
629 wmove (w
, c_line
, c_pos
);
630 TUI_CMD_WIN
->start_line
-= height
- 1;
636 /* Readline callback to prepare the terminal. It is called once each
637 time we enter readline. Terminal is already setup in curses
640 tui_prep_terminal (int notused1
)
642 #ifdef NCURSES_MOUSE_VERSION
643 mousemask (ALL_MOUSE_EVENTS
, NULL
);
647 /* Readline callback to restore the terminal. It is called once each
648 time we leave readline. There is nothing to do in curses mode. */
650 tui_deprep_terminal (void)
652 #ifdef NCURSES_MOUSE_VERSION
657 #ifdef TUI_USE_PIPE_FOR_READLINE
658 /* Read readline output pipe and feed the command window with it.
659 Should be removed when readline is clean. */
661 tui_readline_output (int error
, gdb_client_data data
)
666 size
= read (tui_readline_pipe
[0], buf
, sizeof (buf
) - 1);
667 if (size
> 0 && tui_active
)
675 /* TUI version of displayer.crlf. */
678 tui_mld_crlf (const struct match_list_displayer
*displayer
)
683 /* TUI version of displayer.putch. */
686 tui_mld_putch (const struct match_list_displayer
*displayer
, int ch
)
691 /* TUI version of displayer.puts. */
694 tui_mld_puts (const struct match_list_displayer
*displayer
, const char *s
)
699 /* TUI version of displayer.flush. */
702 tui_mld_flush (const struct match_list_displayer
*displayer
)
704 wrefresh (TUI_CMD_WIN
->handle
.get ());
707 /* TUI version of displayer.erase_entire_line. */
710 tui_mld_erase_entire_line (const struct match_list_displayer
*displayer
)
712 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
713 int cur_y
= getcury (w
);
720 /* TUI version of displayer.beep. */
723 tui_mld_beep (const struct match_list_displayer
*displayer
)
728 /* A wrapper for wgetch that enters nonl mode. We We normally want
729 curses' "nl" mode, but when reading from the user, we'd like to
730 differentiate between C-j and C-m, because some users bind these
731 keys differently in their .inputrc. So, put curses into nonl mode
732 just when reading from the user. See PR tui/20819. */
735 gdb_wgetch (WINDOW
*win
)
738 int r
= wgetch (win
);
743 /* Helper function for tui_mld_read_key.
744 This temporarily replaces tui_getc for use during tab-completion
745 match list display. */
748 tui_mld_getc (FILE *fp
)
750 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
751 int c
= gdb_wgetch (w
);
756 /* TUI version of displayer.read_key. */
759 tui_mld_read_key (const struct match_list_displayer
*displayer
)
761 rl_getc_func_t
*prev
= rl_getc_function
;
764 /* We can't use tui_getc as we need NEWLINE to not get emitted. */
765 rl_getc_function
= tui_mld_getc
;
767 rl_getc_function
= prev
;
771 /* TUI version of rl_completion_display_matches_hook.
772 See gdb_display_match_list for a description of the arguments. */
775 tui_rl_display_match_list (char **matches
, int len
, int max
)
777 struct match_list_displayer displayer
;
779 rl_get_screen_size (&displayer
.height
, &displayer
.width
);
780 displayer
.crlf
= tui_mld_crlf
;
781 displayer
.putch
= tui_mld_putch
;
782 displayer
.puts
= tui_mld_puts
;
783 displayer
.flush
= tui_mld_flush
;
784 displayer
.erase_entire_line
= tui_mld_erase_entire_line
;
785 displayer
.beep
= tui_mld_beep
;
786 displayer
.read_key
= tui_mld_read_key
;
788 gdb_display_match_list (matches
, len
, max
, &displayer
);
791 /* Setup the IO for curses or non-curses mode.
792 - In non-curses mode, readline and gdb use the standard input and
793 standard output/error directly.
794 - In curses mode, the standard output/error is controlled by TUI
795 with the tui_stdout and tui_stderr. The output is redirected in
796 the curses command window. Several readline callbacks are installed
797 so that readline asks for its input to the curses command window
800 tui_setup_io (int mode
)
802 extern int _rl_echoing_p
;
806 /* Ensure that readline has been initialized before saving any
808 tui_ensure_readline_initialized ();
810 /* Redirect readline to TUI. */
811 tui_old_rl_redisplay_function
= rl_redisplay_function
;
812 tui_old_rl_deprep_terminal
= rl_deprep_term_function
;
813 tui_old_rl_prep_terminal
= rl_prep_term_function
;
814 tui_old_rl_getc_function
= rl_getc_function
;
815 tui_old_rl_display_matches_hook
= rl_completion_display_matches_hook
;
816 tui_old_rl_outstream
= rl_outstream
;
817 tui_old_rl_echoing_p
= _rl_echoing_p
;
818 rl_redisplay_function
= tui_redisplay_readline
;
819 rl_deprep_term_function
= tui_deprep_terminal
;
820 rl_prep_term_function
= tui_prep_terminal
;
821 rl_getc_function
= tui_getc
;
823 rl_outstream
= tui_rl_outstream
;
825 rl_completion_display_matches_hook
= tui_rl_display_match_list
;
826 rl_already_prompted
= 0;
828 /* Keep track of previous gdb output. */
829 tui_old_stdout
= gdb_stdout
;
830 tui_old_stderr
= gdb_stderr
;
831 tui_old_uiout
= dynamic_cast<cli_ui_out
*> (current_uiout
);
832 gdb_assert (tui_old_uiout
!= nullptr);
834 /* Reconfigure gdb output. */
835 gdb_stdout
= tui_stdout
;
836 gdb_stderr
= tui_stderr
;
837 gdb_stdlog
= gdb_stdout
; /* for moment */
838 gdb_stdtarg
= gdb_stderr
; /* for moment */
839 gdb_stdtargerr
= gdb_stderr
; /* for moment */
840 current_uiout
= tui_out
;
842 /* Save tty for SIGCONT. */
847 /* Restore gdb output. */
848 gdb_stdout
= tui_old_stdout
;
849 gdb_stderr
= tui_old_stderr
;
850 gdb_stdlog
= gdb_stdout
; /* for moment */
851 gdb_stdtarg
= gdb_stderr
; /* for moment */
852 gdb_stdtargerr
= gdb_stderr
; /* for moment */
853 current_uiout
= tui_old_uiout
;
855 /* Restore readline. */
856 rl_redisplay_function
= tui_old_rl_redisplay_function
;
857 rl_deprep_term_function
= tui_old_rl_deprep_terminal
;
858 rl_prep_term_function
= tui_old_rl_prep_terminal
;
859 rl_getc_function
= tui_old_rl_getc_function
;
860 rl_completion_display_matches_hook
= tui_old_rl_display_matches_hook
;
861 rl_outstream
= tui_old_rl_outstream
;
862 _rl_echoing_p
= tui_old_rl_echoing_p
;
863 rl_already_prompted
= 0;
865 /* Save tty for SIGCONT. */
868 /* Clean up color information. */
869 last_color_pair
= -1;
870 last_style
= ui_file_style ();
872 color_pair_map
.clear ();
877 /* Catch SIGCONT to restore the terminal and refresh the screen. */
879 tui_cont_sig (int sig
)
883 /* Restore the terminal setting because another process (shell)
884 might have changed it. */
887 /* Force a refresh of the screen. */
888 tui_refresh_all_win ();
890 signal (sig
, tui_cont_sig
);
894 /* Initialize the IO for gdb in curses mode. */
896 tui_initialize_io (void)
899 signal (SIGCONT
, tui_cont_sig
);
902 /* Create tui output streams. */
903 tui_stdout
= new tui_file (stdout
);
904 tui_stderr
= new tui_file (stderr
);
905 tui_out
= tui_out_new (tui_stdout
);
907 /* Create the default UI. */
908 tui_old_uiout
= cli_out_new (gdb_stdout
);
910 #ifdef TUI_USE_PIPE_FOR_READLINE
911 /* Temporary solution for readline writing to stdout: redirect
912 readline output in a pipe, read that pipe and output the content
913 in the curses command window. */
914 if (gdb_pipe_cloexec (tui_readline_pipe
) != 0)
915 error (_("Cannot create pipe for readline"));
917 tui_rl_outstream
= fdopen (tui_readline_pipe
[1], "w");
918 if (tui_rl_outstream
== 0)
919 error (_("Cannot redirect readline output"));
921 setvbuf (tui_rl_outstream
, NULL
, _IOLBF
, 0);
924 (void) fcntl (tui_readline_pipe
[0], F_SETFL
, O_NONBLOCK
);
927 (void) fcntl (tui_readline_pipe
[0], F_SETFL
, O_NDELAY
);
930 add_file_handler (tui_readline_pipe
[0], tui_readline_output
, 0, "tui");
932 tui_rl_outstream
= stdout
;
936 /* MS-Windows port of ncurses doesn't support default foreground and
937 background colors, so we must record the default colors at startup. */
938 HANDLE hstdout
= (HANDLE
)_get_osfhandle (fileno (stdout
));
940 CONSOLE_SCREEN_BUFFER_INFO csbi
;
942 if (hstdout
!= INVALID_HANDLE_VALUE
943 && GetConsoleMode (hstdout
, &cmode
) != 0
944 && GetConsoleScreenBufferInfo (hstdout
, &csbi
))
945 ncurses_norm_attr
= csbi
.wAttributes
;
949 /* Dispatch the correct tui function based upon the control
952 tui_dispatch_ctrl_char (unsigned int ch
)
954 struct tui_win_info
*win_info
= tui_win_with_focus ();
956 /* Handle the CTRL-L refresh for each window. */
958 tui_refresh_all_win ();
960 /* If no window has the focus, or if the focus window can't scroll,
961 just pass the character through. */
962 if (win_info
== NULL
|| !win_info
->can_scroll ())
968 win_info
->forward_scroll (0);
971 win_info
->backward_scroll (0);
975 win_info
->forward_scroll (1);
979 win_info
->backward_scroll (1);
982 win_info
->left_scroll (1);
985 win_info
->right_scroll (1);
987 #ifdef NCURSES_MOUSE_VERSION
991 if (getmouse (&mev
) != OK
)
994 for (tui_win_info
*wi
: all_tui_windows ())
995 if (mev
.x
> wi
->x
&& mev
.x
< wi
->x
+ wi
->width
- 1
996 && mev
.y
> wi
->y
&& mev
.y
< wi
->y
+ wi
->height
- 1)
998 if ((mev
.bstate
& BUTTON1_CLICKED
) != 0
999 || (mev
.bstate
& BUTTON2_CLICKED
) != 0
1000 || (mev
.bstate
& BUTTON3_CLICKED
) != 0)
1002 int button
= (mev
.bstate
& BUTTON1_CLICKED
) != 0 ? 1
1003 : ((mev
.bstate
& BUTTON2_CLICKED
) != 0 ? 2
1005 wi
->click (mev
.x
- wi
->x
- 1, mev
.y
- wi
->y
- 1, button
);
1007 #ifdef BUTTON5_PRESSED
1008 else if ((mev
.bstate
& BUTTON4_PRESSED
) != 0)
1009 wi
->backward_scroll (3);
1010 else if ((mev
.bstate
& BUTTON5_PRESSED
) != 0)
1011 wi
->forward_scroll (3);
1021 /* We didn't recognize the character as a control character, so pass it
1026 /* We intercepted the control character, so return 0 (which readline
1027 will interpret as a no-op). */
1034 tui_inject_newline_into_command_window ()
1036 gdb_assert (tui_active
);
1038 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
1040 /* When hitting return with an empty input, gdb executes the last
1041 command. If we emit a newline, this fills up the command window
1042 with empty lines with gdb prompt at beginning. Instead of that,
1043 stay on the same line but provide a visual effect to show the
1044 user we recognized the command. */
1045 if (rl_end
== 0 && !gdb_in_secondary_prompt_p (current_ui
))
1047 wmove (w
, getcury (w
), 0);
1049 /* Clear the line. This will blink the gdb prompt since
1050 it will be redrawn at the same line. */
1057 /* Move cursor to the end of the command line before emitting the
1058 newline. We need to do so because when ncurses outputs a newline
1059 it truncates any text that appears past the end of the cursor. */
1062 px
+= rl_end
- rl_point
;
1063 py
+= px
/ TUI_CMD_WIN
->width
;
1064 px
%= TUI_CMD_WIN
->width
;
1070 /* Main worker for tui_getc. Get a character from the command window.
1071 This is called from the readline package, but wrapped in a
1072 try/catch by tui_getc. */
1075 tui_getc_1 (FILE *fp
)
1080 w
= TUI_CMD_WIN
->handle
.get ();
1082 #ifdef TUI_USE_PIPE_FOR_READLINE
1083 /* Flush readline output. */
1084 tui_readline_output (0, 0);
1087 ch
= gdb_wgetch (w
);
1089 /* Handle prev/next/up/down here. */
1090 ch
= tui_dispatch_ctrl_char (ch
);
1092 if (ch
== KEY_BACKSPACE
)
1095 if (current_ui
->command_editing
&& key_is_start_sequence (ch
))
1100 ch_pending
= gdb_wgetch (w
);
1103 /* If we have pending input following a start sequence, call the stdin
1104 event handler again because ncurses may have already read and stored
1105 the input into its internal buffer, meaning that we won't get an stdin
1106 event for it. If we don't compensate for this missed stdin event, key
1107 sequences as Alt_F (^[f) will not behave promptly.
1109 (We only compensates for the missed 2nd byte of a key sequence because
1110 2-byte sequences are by far the most commonly used. ncurses may have
1111 buffered a larger, 3+-byte key sequence though it remains to be seen
1112 whether it is useful to compensate for all the bytes of such
1114 if (ch_pending
!= ERR
)
1116 ungetch (ch_pending
);
1117 call_stdin_event_handler_again_p
= 1;
1124 /* Get a character from the command window. This is called from the
1125 readline package. */
1132 return tui_getc_1 (fp
);
1134 catch (const gdb_exception
&ex
)
1136 /* Just in case, don't ever let an exception escape to readline.
1137 This shouldn't ever happen, but if it does, print the
1138 exception instead of just crashing GDB. */
1139 exception_print (gdb_stderr
, ex
);
1141 /* If we threw an exception, it's because we recognized the