1 /* TUI support I/O functions.
3 Copyright (C) 1998-2020 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 /* 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 ());
439 tui_puts_internal (WINDOW
*w
, const char *string
, int *height
)
445 while ((c
= *string
++) != 0)
450 if (c
== '\1' || c
== '\2')
452 /* Ignore these, they are readline escape-marking
459 size_t bytes_read
= apply_ansi_escape (w
, string
- 1);
462 string
= string
+ bytes_read
- 1;
468 if (height
!= nullptr)
470 int col
= getcurx (w
);
477 if (TUI_CMD_WIN
!= nullptr && w
== TUI_CMD_WIN
->handle
.get ())
478 update_cmdwin_start_line ();
483 /* Print a string in the curses command window. The output is
484 buffered. It is up to the caller to refresh the screen if
488 tui_puts (const char *string
, WINDOW
*w
)
491 w
= TUI_CMD_WIN
->handle
.get ();
492 tui_puts_internal (w
, string
, nullptr);
495 /* Readline callback.
496 Redisplay the command line with its prompt after readline has
497 changed the edited text. */
499 tui_redisplay_readline (void)
511 /* Detect when we temporarily left SingleKey and now the readline
512 edit buffer is empty, automatically restore the SingleKey
513 mode. The restore must only be done if the command has finished.
514 The command could call prompt_for_continue and we must not
515 restore SingleKey so that the prompt and normal keymap are used. */
516 if (tui_current_key_mode
== TUI_ONE_COMMAND_MODE
&& rl_end
== 0
517 && !gdb_in_secondary_prompt_p (current_ui
))
518 tui_set_key_mode (TUI_SINGLE_KEY_MODE
);
520 if (tui_current_key_mode
== TUI_SINGLE_KEY_MODE
)
523 prompt
= rl_display_prompt
;
527 w
= TUI_CMD_WIN
->handle
.get ();
528 start_line
= TUI_CMD_WIN
->start_line
;
529 wmove (w
, start_line
, 0);
532 if (prompt
!= nullptr)
533 tui_puts_internal (w
, prompt
, &height
);
535 prev_col
= getcurx (w
);
536 for (in
= 0; in
<= rl_end
; in
++)
542 getyx (w
, c_line
, c_pos
);
548 c
= (unsigned char) rl_line_buffer
[in
];
549 if (CTRL_CHAR (c
) || c
== RUBOUT
)
552 waddch (w
, CTRL_CHAR (c
) ? UNCTRL (c
) : '?');
556 /* Expand TABs, since ncurses on MS-Windows doesn't. */
562 } while ((col
% 8) != 0);
569 TUI_CMD_WIN
->start_line
= getcury (w
);
576 TUI_CMD_WIN
->start_line
= getcury (w
);
578 wmove (w
, c_line
, c_pos
);
579 TUI_CMD_WIN
->start_line
-= height
- 1;
585 /* Readline callback to prepare the terminal. It is called once each
586 time we enter readline. Terminal is already setup in curses
589 tui_prep_terminal (int notused1
)
593 /* Readline callback to restore the terminal. It is called once each
594 time we leave readline. There is nothing to do in curses mode. */
596 tui_deprep_terminal (void)
600 #ifdef TUI_USE_PIPE_FOR_READLINE
601 /* Read readline output pipe and feed the command window with it.
602 Should be removed when readline is clean. */
604 tui_readline_output (int error
, gdb_client_data data
)
609 size
= read (tui_readline_pipe
[0], buf
, sizeof (buf
) - 1);
610 if (size
> 0 && tui_active
)
618 /* TUI version of displayer.crlf. */
621 tui_mld_crlf (const struct match_list_displayer
*displayer
)
626 /* TUI version of displayer.putch. */
629 tui_mld_putch (const struct match_list_displayer
*displayer
, int ch
)
634 /* TUI version of displayer.puts. */
637 tui_mld_puts (const struct match_list_displayer
*displayer
, const char *s
)
642 /* TUI version of displayer.flush. */
645 tui_mld_flush (const struct match_list_displayer
*displayer
)
647 wrefresh (TUI_CMD_WIN
->handle
.get ());
650 /* TUI version of displayer.erase_entire_line. */
653 tui_mld_erase_entire_line (const struct match_list_displayer
*displayer
)
655 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
656 int cur_y
= getcury (w
);
663 /* TUI version of displayer.beep. */
666 tui_mld_beep (const struct match_list_displayer
*displayer
)
671 /* A wrapper for wgetch that enters nonl mode. We We normally want
672 curses' "nl" mode, but when reading from the user, we'd like to
673 differentiate between C-j and C-m, because some users bind these
674 keys differently in their .inputrc. So, put curses into nonl mode
675 just when reading from the user. See PR tui/20819. */
678 gdb_wgetch (WINDOW
*win
)
681 int r
= wgetch (win
);
686 /* Helper function for tui_mld_read_key.
687 This temporarily replaces tui_getc for use during tab-completion
688 match list display. */
691 tui_mld_getc (FILE *fp
)
693 WINDOW
*w
= TUI_CMD_WIN
->handle
.get ();
694 int c
= gdb_wgetch (w
);
699 /* TUI version of displayer.read_key. */
702 tui_mld_read_key (const struct match_list_displayer
*displayer
)
704 rl_getc_func_t
*prev
= rl_getc_function
;
707 /* We can't use tui_getc as we need NEWLINE to not get emitted. */
708 rl_getc_function
= tui_mld_getc
;
710 rl_getc_function
= prev
;
714 /* TUI version of rl_completion_display_matches_hook.
715 See gdb_display_match_list for a description of the arguments. */
718 tui_rl_display_match_list (char **matches
, int len
, int max
)
720 struct match_list_displayer displayer
;
722 rl_get_screen_size (&displayer
.height
, &displayer
.width
);
723 displayer
.crlf
= tui_mld_crlf
;
724 displayer
.putch
= tui_mld_putch
;
725 displayer
.puts
= tui_mld_puts
;
726 displayer
.flush
= tui_mld_flush
;
727 displayer
.erase_entire_line
= tui_mld_erase_entire_line
;
728 displayer
.beep
= tui_mld_beep
;
729 displayer
.read_key
= tui_mld_read_key
;
731 gdb_display_match_list (matches
, len
, max
, &displayer
);
734 /* Setup the IO for curses or non-curses mode.
735 - In non-curses mode, readline and gdb use the standard input and
736 standard output/error directly.
737 - In curses mode, the standard output/error is controlled by TUI
738 with the tui_stdout and tui_stderr. The output is redirected in
739 the curses command window. Several readline callbacks are installed
740 so that readline asks for its input to the curses command window
743 tui_setup_io (int mode
)
745 extern int _rl_echoing_p
;
749 /* Redirect readline to TUI. */
750 tui_old_rl_redisplay_function
= rl_redisplay_function
;
751 tui_old_rl_deprep_terminal
= rl_deprep_term_function
;
752 tui_old_rl_prep_terminal
= rl_prep_term_function
;
753 tui_old_rl_getc_function
= rl_getc_function
;
754 tui_old_rl_display_matches_hook
= rl_completion_display_matches_hook
;
755 tui_old_rl_outstream
= rl_outstream
;
756 tui_old_rl_echoing_p
= _rl_echoing_p
;
757 rl_redisplay_function
= tui_redisplay_readline
;
758 rl_deprep_term_function
= tui_deprep_terminal
;
759 rl_prep_term_function
= tui_prep_terminal
;
760 rl_getc_function
= tui_getc
;
762 rl_outstream
= tui_rl_outstream
;
764 rl_completion_display_matches_hook
= tui_rl_display_match_list
;
765 rl_already_prompted
= 0;
767 /* Keep track of previous gdb output. */
768 tui_old_stdout
= gdb_stdout
;
769 tui_old_stderr
= gdb_stderr
;
770 tui_old_uiout
= dynamic_cast<cli_ui_out
*> (current_uiout
);
771 gdb_assert (tui_old_uiout
!= nullptr);
773 /* Reconfigure gdb output. */
774 gdb_stdout
= tui_stdout
;
775 gdb_stderr
= tui_stderr
;
776 gdb_stdlog
= gdb_stdout
; /* for moment */
777 gdb_stdtarg
= gdb_stderr
; /* for moment */
778 gdb_stdtargerr
= gdb_stderr
; /* for moment */
779 current_uiout
= tui_out
;
781 /* Save tty for SIGCONT. */
786 /* Restore gdb output. */
787 gdb_stdout
= tui_old_stdout
;
788 gdb_stderr
= tui_old_stderr
;
789 gdb_stdlog
= gdb_stdout
; /* for moment */
790 gdb_stdtarg
= gdb_stderr
; /* for moment */
791 gdb_stdtargerr
= gdb_stderr
; /* for moment */
792 current_uiout
= tui_old_uiout
;
794 /* Restore readline. */
795 rl_redisplay_function
= tui_old_rl_redisplay_function
;
796 rl_deprep_term_function
= tui_old_rl_deprep_terminal
;
797 rl_prep_term_function
= tui_old_rl_prep_terminal
;
798 rl_getc_function
= tui_old_rl_getc_function
;
799 rl_completion_display_matches_hook
= tui_old_rl_display_matches_hook
;
800 rl_outstream
= tui_old_rl_outstream
;
801 _rl_echoing_p
= tui_old_rl_echoing_p
;
802 rl_already_prompted
= 0;
804 /* Save tty for SIGCONT. */
807 /* Clean up color information. */
808 last_color_pair
= -1;
809 last_style
= ui_file_style ();
811 color_pair_map
.clear ();
816 /* Catch SIGCONT to restore the terminal and refresh the screen. */
818 tui_cont_sig (int sig
)
822 /* Restore the terminal setting because another process (shell)
823 might have changed it. */
826 /* Force a refresh of the screen. */
827 tui_refresh_all_win ();
829 signal (sig
, tui_cont_sig
);
833 /* Initialize the IO for gdb in curses mode. */
835 tui_initialize_io (void)
838 signal (SIGCONT
, tui_cont_sig
);
841 /* Create tui output streams. */
842 tui_stdout
= new tui_file (stdout
);
843 tui_stderr
= new tui_file (stderr
);
844 tui_out
= tui_out_new (tui_stdout
);
846 /* Create the default UI. */
847 tui_old_uiout
= cli_out_new (gdb_stdout
);
849 #ifdef TUI_USE_PIPE_FOR_READLINE
850 /* Temporary solution for readline writing to stdout: redirect
851 readline output in a pipe, read that pipe and output the content
852 in the curses command window. */
853 if (gdb_pipe_cloexec (tui_readline_pipe
) != 0)
854 error (_("Cannot create pipe for readline"));
856 tui_rl_outstream
= fdopen (tui_readline_pipe
[1], "w");
857 if (tui_rl_outstream
== 0)
858 error (_("Cannot redirect readline output"));
860 setvbuf (tui_rl_outstream
, NULL
, _IOLBF
, 0);
863 (void) fcntl (tui_readline_pipe
[0], F_SETFL
, O_NONBLOCK
);
866 (void) fcntl (tui_readline_pipe
[0], F_SETFL
, O_NDELAY
);
869 add_file_handler (tui_readline_pipe
[0], tui_readline_output
, 0);
871 tui_rl_outstream
= stdout
;
875 /* MS-Windows port of ncurses doesn't support default foreground and
876 background colors, so we must record the default colors at startup. */
877 HANDLE hstdout
= (HANDLE
)_get_osfhandle (fileno (stdout
));
879 CONSOLE_SCREEN_BUFFER_INFO csbi
;
881 if (hstdout
!= INVALID_HANDLE_VALUE
882 && GetConsoleMode (hstdout
, &cmode
) != 0
883 && GetConsoleScreenBufferInfo (hstdout
, &csbi
))
884 ncurses_norm_attr
= csbi
.wAttributes
;
888 /* Dispatch the correct tui function based upon the control
891 tui_dispatch_ctrl_char (unsigned int ch
)
893 struct tui_win_info
*win_info
= tui_win_with_focus ();
895 /* Handle the CTRL-L refresh for each window. */
897 tui_refresh_all_win ();
899 /* If no window has the focus, or if the focus window can't scroll,
900 just pass the character through. */
901 if (win_info
== NULL
|| !win_info
->can_scroll ())
907 win_info
->forward_scroll (0);
910 win_info
->backward_scroll (0);
914 win_info
->forward_scroll (1);
918 win_info
->backward_scroll (1);
921 win_info
->left_scroll (1);
924 win_info
->right_scroll (1);
929 /* We didn't recognize the character as a control character, so pass it
934 /* We intercepted the control character, so return 0 (which readline
935 will interpret as a no-op). */
939 /* Main worker for tui_getc. Get a character from the command window.
940 This is called from the readline package, but wrapped in a
941 try/catch by tui_getc. */
944 tui_getc_1 (FILE *fp
)
949 w
= TUI_CMD_WIN
->handle
.get ();
951 #ifdef TUI_USE_PIPE_FOR_READLINE
952 /* Flush readline output. */
953 tui_readline_output (0, 0);
958 /* The \n must be echoed because it will not be printed by
960 if (ch
== '\n' || ch
== '\r')
962 /* When hitting return with an empty input, gdb executes the last
963 command. If we emit a newline, this fills up the command window
964 with empty lines with gdb prompt at beginning. Instead of that,
965 stay on the same line but provide a visual effect to show the
966 user we recognized the command. */
967 if (rl_end
== 0 && !gdb_in_secondary_prompt_p (current_ui
))
969 wmove (w
, getcury (w
), 0);
971 /* Clear the line. This will blink the gdb prompt since
972 it will be redrawn at the same line. */
979 /* Move cursor to the end of the command line before emitting the
980 newline. We need to do so because when ncurses outputs a newline
981 it truncates any text that appears past the end of the cursor. */
984 px
+= rl_end
- rl_point
;
985 py
+= px
/ TUI_CMD_WIN
->width
;
986 px
%= TUI_CMD_WIN
->width
;
992 /* Handle prev/next/up/down here. */
993 ch
= tui_dispatch_ctrl_char (ch
);
995 if (ch
== KEY_BACKSPACE
)
998 if (current_ui
->command_editing
&& key_is_start_sequence (ch
))
1003 ch_pending
= gdb_wgetch (w
);
1006 /* If we have pending input following a start sequence, call the stdin
1007 event handler again because ncurses may have already read and stored
1008 the input into its internal buffer, meaning that we won't get an stdin
1009 event for it. If we don't compensate for this missed stdin event, key
1010 sequences as Alt_F (^[f) will not behave promptly.
1012 (We only compensates for the missed 2nd byte of a key sequence because
1013 2-byte sequences are by far the most commonly used. ncurses may have
1014 buffered a larger, 3+-byte key sequence though it remains to be seen
1015 whether it is useful to compensate for all the bytes of such
1017 if (ch_pending
!= ERR
)
1019 ungetch (ch_pending
);
1020 call_stdin_event_handler_again_p
= 1;
1027 /* Get a character from the command window. This is called from the
1028 readline package. */
1035 return tui_getc_1 (fp
);
1037 catch (const gdb_exception
&ex
)
1039 /* Just in case, don't ever let an exception escape to readline.
1040 This shouldn't ever happen, but if it does, print the
1041 exception instead of just crashing GDB. */
1042 exception_print (gdb_stderr
, ex
);
1044 /* If we threw an exception, it's because we recognized the
1052 gdb::unique_xmalloc_ptr
<char>
1053 tui_expand_tabs (const char *string
)
1059 /* 1. How many additional characters do we need? */
1060 for (ncol
= 0, n_adjust
= 0, s
= string
; s
; )
1062 s
= strpbrk (s
, "\t");
1065 ncol
+= (s
- string
) + n_adjust
;
1066 /* Adjustment for the next tab stop, minus one for the TAB
1067 we replace with spaces. */
1068 n_adjust
+= 8 - (ncol
% 8) - 1;
1073 /* Allocate the copy. */
1074 ret
= q
= (char *) xmalloc (strlen (string
) + n_adjust
+ 1);
1076 /* 2. Copy the original string while replacing TABs with spaces. */
1077 for (ncol
= 0, s
= string
; s
; )
1079 const char *s1
= strpbrk (s
, "\t");
1084 strncpy (q
, s
, s1
- s
);
1091 } while ((ncol
% 8) != 0);
1099 return gdb::unique_xmalloc_ptr
<char> (ret
);