1 /* TUI support I/O functions.
3 Copyright (C) 1998-2019 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"
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 /* The last gdb prompt that was registered in readline.
135 This may be the main gdb prompt or a secondary prompt. */
136 static char *tui_rl_saved_prompt
;
138 /* Print a character in the curses command window. The output is
139 buffered. It is up to the caller to refresh the screen if
143 do_tui_putc (WINDOW
*w
, char c
)
145 static int tui_skip_line
= -1;
147 /* Catch annotation and discard them. We need two \032 and discard
148 until a \n is seen. */
153 else if (tui_skip_line
!= 1)
156 /* Expand TABs, since ncurses on MS-Windows doesn't. */
167 while ((col
% 8) != 0);
176 /* Update the cached value of the command window's start line based on
177 the window's current Y coordinate. */
180 update_cmdwin_start_line ()
182 TUI_CMD_WIN
->start_line
= getcury (TUI_CMD_WIN
->handle
.get ());
185 /* Print a character in the curses command window. The output is
186 buffered. It is up to the caller to refresh the screen if
192 do_tui_putc (TUI_CMD_WIN
->handle
.get (), c
);
193 update_cmdwin_start_line ();
196 /* This maps colors to their corresponding color index. */
198 static std::map
<ui_file_style::color
, int> color_map
;
200 /* This holds a pair of colors and is used to track the mapping
201 between a color pair index and the actual colors. */
208 bool operator< (const color_pair
&o
) const
210 return fg
< o
.fg
|| (fg
== o
.fg
&& bg
< o
.bg
);
214 /* This maps pairs of colors to their corresponding color pair
217 static std::map
<color_pair
, int> color_pair_map
;
219 /* This is indexed by ANSI color offset from the base color, and holds
220 the corresponding curses color constant. */
222 static const int curses_colors
[] = {
233 /* Given a color, find its index. */
236 get_color (const ui_file_style::color
&color
, int *result
)
238 if (color
.is_none ())
240 else if (color
.is_basic ())
241 *result
= curses_colors
[color
.get_value ()];
244 auto it
= color_map
.find (color
);
245 if (it
== color_map
.end ())
247 /* The first 8 colors are standard. */
248 int next
= color_map
.size () + 8;
253 /* We store RGB as 0..255, but curses wants 0..1000. */
254 if (init_color (next
, rgb
[0] * 1000 / 255, rgb
[1] * 1000 / 255,
255 rgb
[2] * 1000 / 255) == ERR
)
257 color_map
[color
] = next
;
261 *result
= it
->second
;
266 /* The most recently emitted color pair. */
268 static int last_color_pair
= -1;
270 /* The most recently applied style. */
272 static ui_file_style last_style
;
274 /* If true, we're highlighting the current source line in reverse
276 static bool reverse_mode_p
= false;
278 /* The background/foreground colors before we entered reverse
280 static ui_file_style::color
reverse_save_bg (ui_file_style::NONE
);
281 static ui_file_style::color
reverse_save_fg (ui_file_style::NONE
);
283 /* Given two colors, return their color pair index; making a new one
287 get_color_pair (int fg
, int bg
)
289 color_pair c
= { fg
, bg
};
290 auto it
= color_pair_map
.find (c
);
291 if (it
== color_pair_map
.end ())
293 /* Color pair 0 is our default color, so new colors start at
295 int next
= color_pair_map
.size () + 1;
296 /* Curses has a limited number of available color pairs. Fall
297 back to the default if we've used too many. */
298 if (next
>= COLOR_PAIRS
)
300 init_pair (next
, fg
, bg
);
301 color_pair_map
[c
] = next
;
307 /* Apply STYLE to W. */
310 tui_apply_style (WINDOW
*w
, ui_file_style style
)
313 wattron (w
, A_NORMAL
);
314 wattroff (w
, A_BOLD
);
316 wattroff (w
, A_REVERSE
);
317 if (last_color_pair
!= -1)
318 wattroff (w
, COLOR_PAIR (last_color_pair
));
319 wattron (w
, COLOR_PAIR (0));
321 const ui_file_style::color
&fg
= style
.get_foreground ();
322 const ui_file_style::color
&bg
= style
.get_background ();
323 if (!fg
.is_none () || !bg
.is_none ())
326 if (get_color (fg
, &fgi
) && get_color (bg
, &bgi
))
329 /* MS-Windows port of ncurses doesn't support implicit
330 default foreground and background colors, so we must
331 specify them explicitly when needed, using the colors we
334 fgi
= ncurses_norm_attr
& 15;
336 bgi
= (ncurses_norm_attr
>> 4) & 15;
338 int pair
= get_color_pair (fgi
, bgi
);
339 if (last_color_pair
!= -1)
340 wattroff (w
, COLOR_PAIR (last_color_pair
));
341 wattron (w
, COLOR_PAIR (pair
));
342 last_color_pair
= pair
;
346 switch (style
.get_intensity ())
348 case ui_file_style::NORMAL
:
351 case ui_file_style::BOLD
:
355 case ui_file_style::DIM
:
360 gdb_assert_not_reached ("invalid intensity");
363 if (style
.is_reverse ())
364 wattron (w
, A_REVERSE
);
369 /* Apply an ANSI escape sequence from BUF to W. BUF must start with
370 the ESC character. If BUF does not start with an ANSI escape,
371 return 0. Otherwise, apply the sequence if it is recognized, or
372 simply ignore it if not. In this case, the number of bytes read
373 from BUF is returned. */
376 apply_ansi_escape (WINDOW
*w
, const char *buf
)
378 ui_file_style style
= last_style
;
381 if (!style
.parse (buf
, &n_read
))
386 /* We want to reverse _only_ the default foreground/background
387 colors. If the foreground color is not the default (because
388 the text was styled), we want to leave it as is. If e.g.,
389 the terminal is fg=BLACK, and bg=WHITE, and the style wants
390 to print text in RED, we want to reverse the background color
391 (print in BLACK), but still print the text in RED. To do
392 that, we enable the A_REVERSE attribute, and re-reverse the
393 parsed-style's fb/bg colors.
395 Notes on the approach:
397 - there's no portable way to know which colors the default
400 - this approach does the right thing even if you change the
401 terminal colors while GDB is running -- the reversed
402 colors automatically adapt.
404 if (!style
.is_default ())
406 ui_file_style::color bg
= style
.get_background ();
407 ui_file_style::color fg
= style
.get_foreground ();
412 /* Enable A_REVERSE. */
413 style
.set_reverse (true);
416 tui_apply_style (w
, style
);
423 tui_set_reverse_mode (WINDOW
*w
, bool reverse
)
425 ui_file_style style
= last_style
;
427 reverse_mode_p
= reverse
;
428 style
.set_reverse (reverse
);
432 reverse_save_bg
= style
.get_background ();
433 reverse_save_fg
= style
.get_foreground ();
437 style
.set_bg (reverse_save_bg
);
438 style
.set_fg (reverse_save_fg
);
441 tui_apply_style (w
, style
);
444 /* Print LENGTH characters from the buffer pointed to by BUF to the
445 curses command window. The output is buffered. It is up to the
446 caller to refresh the screen if necessary. */
449 tui_write (const char *buf
, size_t length
)
451 /* We need this to be \0-terminated for the regexp matching. */
452 std::string
copy (buf
, length
);
453 tui_puts (copy
.c_str ());
457 tui_puts_internal (WINDOW
*w
, const char *string
, int *height
)
463 while ((c
= *string
++) != 0)
468 if (c
== '\1' || c
== '\2')
470 /* Ignore these, they are readline escape-marking
477 size_t bytes_read
= apply_ansi_escape (w
, string
- 1);
480 string
= string
+ bytes_read
- 1;
486 if (height
!= nullptr)
488 int col
= getcurx (w
);
495 if (TUI_CMD_WIN
!= nullptr && w
== TUI_CMD_WIN
->handle
.get ())
496 update_cmdwin_start_line ();
501 /* Print a string in the curses command window. The output is
502 buffered. It is up to the caller to refresh the screen if
506 tui_puts (const char *string
, WINDOW
*w
)
509 w
= TUI_CMD_WIN
->handle
.get ();
510 tui_puts_internal (w
, string
, nullptr);
513 /* Readline callback.
514 Redisplay the command line with its prompt after readline has
515 changed the edited text. */
517 tui_redisplay_readline (void)
529 /* Detect when we temporarily left SingleKey and now the readline
530 edit buffer is empty, automatically restore the SingleKey
531 mode. The restore must only be done if the command has finished.
532 The command could call prompt_for_continue and we must not
533 restore SingleKey so that the prompt and normal keymap are used. */
534 if (tui_current_key_mode
== TUI_ONE_COMMAND_MODE
&& rl_end
== 0
535 && !gdb_in_secondary_prompt_p (current_ui
))
536 tui_set_key_mode (TUI_SINGLE_KEY_MODE
);
538 if (tui_current_key_mode
== TUI_SINGLE_KEY_MODE
)
541 prompt
= tui_rl_saved_prompt
;
545 w
= TUI_CMD_WIN
->handle
.get ();
546 start_line
= TUI_CMD_WIN
->start_line
;
547 wmove (w
, start_line
, 0);
550 if (prompt
!= nullptr)
551 tui_puts_internal (w
, prompt
, &height
);
553 prev_col
= getcurx (w
);
554 for (in
= 0; in
<= rl_end
; in
++)
560 getyx (w
, c_line
, c_pos
);
566 c
= (unsigned char) rl_line_buffer
[in
];
567 if (CTRL_CHAR (c
) || c
== RUBOUT
)
570 waddch (w
, CTRL_CHAR (c
) ? UNCTRL (c
) : '?');
574 /* Expand TABs, since ncurses on MS-Windows doesn't. */
580 } while ((col
% 8) != 0);
587 TUI_CMD_WIN
->start_line
= getcury (w
);
594 TUI_CMD_WIN
->start_line
= getcury (w
);
596 wmove (w
, c_line
, c_pos
);
597 TUI_CMD_WIN
->start_line
-= height
- 1;
603 /* Readline callback to prepare the terminal. It is called once each
604 time we enter readline. Terminal is already setup in curses
607 tui_prep_terminal (int notused1
)
609 /* Save the prompt registered in readline to correctly display it.
610 (we can't use gdb_prompt() due to secondary prompts and can't use
611 rl_prompt because it points to an alloca buffer). */
612 xfree (tui_rl_saved_prompt
);
613 tui_rl_saved_prompt
= rl_prompt
!= NULL
? xstrdup (rl_prompt
) : NULL
;
616 /* Readline callback to restore the terminal. It is called once each
617 time we leave readline. There is nothing to do in curses mode. */
619 tui_deprep_terminal (void)
623 #ifdef TUI_USE_PIPE_FOR_READLINE
624 /* Read readline output pipe and feed the command window with it.
625 Should be removed when readline is clean. */
627 tui_readline_output (int error
, gdb_client_data data
)
632 size
= read (tui_readline_pipe
[0], buf
, sizeof (buf
) - 1);
633 if (size
> 0 && tui_active
)
641 /* TUI version of displayer.crlf. */
644 tui_mld_crlf (const struct match_list_displayer
*displayer
)
649 /* TUI version of displayer.putch. */
652 tui_mld_putch (const struct match_list_displayer
*displayer
, int ch
)
657 /* TUI version of displayer.puts. */
660 tui_mld_puts (const struct match_list_displayer
*displayer
, const char *s
)
665 /* TUI version of displayer.flush. */
668 tui_mld_flush (const struct match_list_displayer
*displayer
)
670 wrefresh (TUI_CMD_WIN
->handle
.get ());
673 /* TUI version of displayer.erase_entire_line. */
676 tui_mld_erase_entire_line (const struct match_list_displayer
*displayer
)
678 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
679 int cur_y
= getcury (w
);
686 /* TUI version of displayer.beep. */
689 tui_mld_beep (const struct match_list_displayer
*displayer
)
694 /* A wrapper for wgetch that enters nonl mode. We We normally want
695 curses' "nl" mode, but when reading from the user, we'd like to
696 differentiate between C-j and C-m, because some users bind these
697 keys differently in their .inputrc. So, put curses into nonl mode
698 just when reading from the user. See PR tui/20819. */
701 gdb_wgetch (WINDOW
*win
)
704 int r
= wgetch (win
);
709 /* Helper function for tui_mld_read_key.
710 This temporarily replaces tui_getc for use during tab-completion
711 match list display. */
714 tui_mld_getc (FILE *fp
)
716 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
717 int c
= gdb_wgetch (w
);
722 /* TUI version of displayer.read_key. */
725 tui_mld_read_key (const struct match_list_displayer
*displayer
)
727 rl_getc_func_t
*prev
= rl_getc_function
;
730 /* We can't use tui_getc as we need NEWLINE to not get emitted. */
731 rl_getc_function
= tui_mld_getc
;
733 rl_getc_function
= prev
;
737 /* TUI version of rl_completion_display_matches_hook.
738 See gdb_display_match_list for a description of the arguments. */
741 tui_rl_display_match_list (char **matches
, int len
, int max
)
743 struct match_list_displayer displayer
;
745 rl_get_screen_size (&displayer
.height
, &displayer
.width
);
746 displayer
.crlf
= tui_mld_crlf
;
747 displayer
.putch
= tui_mld_putch
;
748 displayer
.puts
= tui_mld_puts
;
749 displayer
.flush
= tui_mld_flush
;
750 displayer
.erase_entire_line
= tui_mld_erase_entire_line
;
751 displayer
.beep
= tui_mld_beep
;
752 displayer
.read_key
= tui_mld_read_key
;
754 gdb_display_match_list (matches
, len
, max
, &displayer
);
757 /* Setup the IO for curses or non-curses mode.
758 - In non-curses mode, readline and gdb use the standard input and
759 standard output/error directly.
760 - In curses mode, the standard output/error is controlled by TUI
761 with the tui_stdout and tui_stderr. The output is redirected in
762 the curses command window. Several readline callbacks are installed
763 so that readline asks for its input to the curses command window
766 tui_setup_io (int mode
)
768 extern int _rl_echoing_p
;
772 /* Redirect readline to TUI. */
773 tui_old_rl_redisplay_function
= rl_redisplay_function
;
774 tui_old_rl_deprep_terminal
= rl_deprep_term_function
;
775 tui_old_rl_prep_terminal
= rl_prep_term_function
;
776 tui_old_rl_getc_function
= rl_getc_function
;
777 tui_old_rl_display_matches_hook
= rl_completion_display_matches_hook
;
778 tui_old_rl_outstream
= rl_outstream
;
779 tui_old_rl_echoing_p
= _rl_echoing_p
;
780 rl_redisplay_function
= tui_redisplay_readline
;
781 rl_deprep_term_function
= tui_deprep_terminal
;
782 rl_prep_term_function
= tui_prep_terminal
;
783 rl_getc_function
= tui_getc
;
785 rl_outstream
= tui_rl_outstream
;
787 rl_completion_display_matches_hook
= tui_rl_display_match_list
;
788 rl_already_prompted
= 0;
790 /* Keep track of previous gdb output. */
791 tui_old_stdout
= gdb_stdout
;
792 tui_old_stderr
= gdb_stderr
;
793 tui_old_uiout
= dynamic_cast<cli_ui_out
*> (current_uiout
);
794 gdb_assert (tui_old_uiout
!= nullptr);
796 /* Reconfigure gdb output. */
797 gdb_stdout
= tui_stdout
;
798 gdb_stderr
= tui_stderr
;
799 gdb_stdlog
= gdb_stdout
; /* for moment */
800 gdb_stdtarg
= gdb_stderr
; /* for moment */
801 gdb_stdtargerr
= gdb_stderr
; /* for moment */
802 current_uiout
= tui_out
;
804 /* Save tty for SIGCONT. */
809 /* Restore gdb output. */
810 gdb_stdout
= tui_old_stdout
;
811 gdb_stderr
= tui_old_stderr
;
812 gdb_stdlog
= gdb_stdout
; /* for moment */
813 gdb_stdtarg
= gdb_stderr
; /* for moment */
814 gdb_stdtargerr
= gdb_stderr
; /* for moment */
815 current_uiout
= tui_old_uiout
;
817 /* Restore readline. */
818 rl_redisplay_function
= tui_old_rl_redisplay_function
;
819 rl_deprep_term_function
= tui_old_rl_deprep_terminal
;
820 rl_prep_term_function
= tui_old_rl_prep_terminal
;
821 rl_getc_function
= tui_old_rl_getc_function
;
822 rl_completion_display_matches_hook
= tui_old_rl_display_matches_hook
;
823 rl_outstream
= tui_old_rl_outstream
;
824 _rl_echoing_p
= tui_old_rl_echoing_p
;
825 rl_already_prompted
= 0;
827 /* Save tty for SIGCONT. */
830 /* Clean up color information. */
831 last_color_pair
= -1;
832 last_style
= ui_file_style ();
834 color_pair_map
.clear ();
839 /* Catch SIGCONT to restore the terminal and refresh the screen. */
841 tui_cont_sig (int sig
)
845 /* Restore the terminal setting because another process (shell)
846 might have changed it. */
849 /* Force a refresh of the screen. */
850 tui_refresh_all_win ();
852 signal (sig
, tui_cont_sig
);
856 /* Initialize the IO for gdb in curses mode. */
858 tui_initialize_io (void)
861 signal (SIGCONT
, tui_cont_sig
);
864 /* Create tui output streams. */
865 tui_stdout
= new tui_file (stdout
);
866 tui_stderr
= new tui_file (stderr
);
867 tui_out
= tui_out_new (tui_stdout
);
869 /* Create the default UI. */
870 tui_old_uiout
= cli_out_new (gdb_stdout
);
872 #ifdef TUI_USE_PIPE_FOR_READLINE
873 /* Temporary solution for readline writing to stdout: redirect
874 readline output in a pipe, read that pipe and output the content
875 in the curses command window. */
876 if (gdb_pipe_cloexec (tui_readline_pipe
) != 0)
877 error (_("Cannot create pipe for readline"));
879 tui_rl_outstream
= fdopen (tui_readline_pipe
[1], "w");
880 if (tui_rl_outstream
== 0)
881 error (_("Cannot redirect readline output"));
883 setvbuf (tui_rl_outstream
, NULL
, _IOLBF
, 0);
886 (void) fcntl (tui_readline_pipe
[0], F_SETFL
, O_NONBLOCK
);
889 (void) fcntl (tui_readline_pipe
[0], F_SETFL
, O_NDELAY
);
892 add_file_handler (tui_readline_pipe
[0], tui_readline_output
, 0);
894 tui_rl_outstream
= stdout
;
898 /* MS-Windows port of ncurses doesn't support default foreground and
899 background colors, so we must record the default colors at startup. */
900 HANDLE hstdout
= (HANDLE
)_get_osfhandle (fileno (stdout
));
902 CONSOLE_SCREEN_BUFFER_INFO csbi
;
904 if (hstdout
!= INVALID_HANDLE_VALUE
905 && GetConsoleMode (hstdout
, &cmode
) != 0
906 && GetConsoleScreenBufferInfo (hstdout
, &csbi
))
907 ncurses_norm_attr
= csbi
.wAttributes
;
911 /* Dispatch the correct tui function based upon the control
914 tui_dispatch_ctrl_char (unsigned int ch
)
916 struct tui_win_info
*win_info
= tui_win_with_focus ();
918 /* Handle the CTRL-L refresh for each window. */
920 tui_refresh_all_win ();
922 /* If no window has the focus, or if the focus window can't scroll,
923 just pass the character through. */
924 if (win_info
== NULL
|| !win_info
->can_scroll ())
930 win_info
->forward_scroll (0);
933 win_info
->backward_scroll (0);
937 win_info
->forward_scroll (1);
941 win_info
->backward_scroll (1);
944 win_info
->left_scroll (1);
947 win_info
->right_scroll (1);
952 /* We didn't recognize the character as a control character, so pass it
957 /* We intercepted the control character, so return 0 (which readline
958 will interpret as a no-op). */
962 /* Get a character from the command window. This is called from the
970 w
= TUI_CMD_WIN
->handle
.get ();
972 #ifdef TUI_USE_PIPE_FOR_READLINE
973 /* Flush readline output. */
974 tui_readline_output (0, 0);
979 /* The \n must be echoed because it will not be printed by
981 if (ch
== '\n' || ch
== '\r')
983 /* When hitting return with an empty input, gdb executes the last
984 command. If we emit a newline, this fills up the command window
985 with empty lines with gdb prompt at beginning. Instead of that,
986 stay on the same line but provide a visual effect to show the
987 user we recognized the command. */
988 if (rl_end
== 0 && !gdb_in_secondary_prompt_p (current_ui
))
990 wmove (w
, getcury (w
), 0);
992 /* Clear the line. This will blink the gdb prompt since
993 it will be redrawn at the same line. */
1000 /* Move cursor to the end of the command line before emitting the
1001 newline. We need to do so because when ncurses outputs a newline
1002 it truncates any text that appears past the end of the cursor. */
1005 px
+= rl_end
- rl_point
;
1006 py
+= px
/ TUI_CMD_WIN
->width
;
1007 px
%= TUI_CMD_WIN
->width
;
1013 /* Handle prev/next/up/down here. */
1014 ch
= tui_dispatch_ctrl_char (ch
);
1016 if (ch
== KEY_BACKSPACE
)
1019 if (current_ui
->command_editing
&& key_is_start_sequence (ch
))
1024 ch_pending
= gdb_wgetch (w
);
1027 /* If we have pending input following a start sequence, call the stdin
1028 event handler again because ncurses may have already read and stored
1029 the input into its internal buffer, meaning that we won't get an stdin
1030 event for it. If we don't compensate for this missed stdin event, key
1031 sequences as Alt_F (^[f) will not behave promptly.
1033 (We only compensates for the missed 2nd byte of a key sequence because
1034 2-byte sequences are by far the most commonly used. ncurses may have
1035 buffered a larger, 3+-byte key sequence though it remains to be seen
1036 whether it is useful to compensate for all the bytes of such
1038 if (ch_pending
!= ERR
)
1040 ungetch (ch_pending
);
1041 call_stdin_event_handler_again_p
= 1;
1050 gdb::unique_xmalloc_ptr
<char>
1051 tui_expand_tabs (const char *string
)
1057 /* 1. How many additional characters do we need? */
1058 for (ncol
= 0, n_adjust
= 0, s
= string
; s
; )
1060 s
= strpbrk (s
, "\t");
1063 ncol
+= (s
- string
) + n_adjust
;
1064 /* Adjustment for the next tab stop, minus one for the TAB
1065 we replace with spaces. */
1066 n_adjust
+= 8 - (ncol
% 8) - 1;
1071 /* Allocate the copy. */
1072 ret
= q
= (char *) xmalloc (strlen (string
) + n_adjust
+ 1);
1074 /* 2. Copy the original string while replacing TABs with spaces. */
1075 for (ncol
= 0, s
= string
; s
; )
1077 const char *s1
= strpbrk (s
, "\t");
1082 strncpy (q
, s
, s1
- s
);
1089 } while ((ncol
% 8) != 0);
1097 return gdb::unique_xmalloc_ptr
<char> (ret
);