1 /* TUI support I/O functions.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009,
4 2010, 2011 Free Software Foundation, Inc.
6 Contributed by Hewlett-Packard Company.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include "event-loop.h"
26 #include "event-top.h"
30 #include "tui/tui-data.h"
31 #include "tui/tui-io.h"
32 #include "tui/tui-command.h"
33 #include "tui/tui-win.h"
34 #include "tui/tui-wingeneral.h"
35 #include "tui/tui-file.h"
42 #include "gdb_curses.h"
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
47 #include "readline/readline.h"
50 key_is_start_sequence (int ch)
56 key_is_end_sequence (int ch)
62 key_is_backspace (int ch)
68 key_is_command_char (int ch)
70 return ((ch == KEY_NPAGE) || (ch == KEY_PPAGE)
71 || (ch == KEY_LEFT) || (ch == KEY_RIGHT)
72 || (ch == KEY_UP) || (ch == KEY_DOWN)
73 || (ch == KEY_SF) || (ch == KEY_SR)
75 || key_is_start_sequence (ch));
78 /* Use definition from readline 4.3. */
80 #define CTRL_CHAR(c) \
81 ((c) < control_character_threshold && (((c) & 0x80) == 0))
83 /* This file controls the IO interactions between gdb and curses.
84 When the TUI is enabled, gdb has two modes a curses and a standard
87 In curses mode, the gdb outputs are made in a curses command
88 window. For this, the gdb_stdout and gdb_stderr are redirected to
89 the specific ui_file implemented by TUI. The output is handled by
90 tui_puts(). The input is also controlled by curses with
91 tui_getc(). The readline library uses this function to get its
92 input. Several readline hooks are installed to redirect readline
93 output to the TUI (see also the note below).
95 In normal mode, the gdb outputs are restored to their origin, that
96 is as if TUI is not used. Readline also uses its original getc()
99 Note SCz/2001-07-21: the current readline is not clean in its
100 management of the output. Even if we install a redisplay handler,
101 it sometimes writes on a stdout file. It is important to redirect
102 every output produced by readline, otherwise the curses window will
103 be garbled. This is implemented with a pipe that TUI reads and
104 readline writes to. A gdb input handler is created so that reading
105 the pipe is handled automatically. This will probably not work on
106 non-Unix platforms. The best fix is to make readline clean enougth
107 so that is never write on stdout.
109 Note SCz/2002-09-01: we now use more readline hooks and it seems
110 that with them we don't need the pipe anymore (verified by creating
111 the pipe and closing its end so that write causes a SIGPIPE). The
112 old pipe code is still there and can be conditionally removed by
113 #undef TUI_USE_PIPE_FOR_READLINE. */
115 /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */
117 #define TUI_USE_PIPE_FOR_READLINE
119 /* #undef TUI_USE_PIPE_FOR_READLINE */
121 /* TUI output files. */
122 static struct ui_file *tui_stdout;
123 static struct ui_file *tui_stderr;
124 struct ui_out *tui_out;
126 /* GDB output files in non-curses mode. */
127 static struct ui_file *tui_old_stdout;
128 static struct ui_file *tui_old_stderr;
129 struct ui_out *tui_old_uiout;
131 /* Readline previous hooks. */
132 static Function *tui_old_rl_getc_function;
133 static VFunction *tui_old_rl_redisplay_function;
134 static VFunction *tui_old_rl_prep_terminal;
135 static VFunction *tui_old_rl_deprep_terminal;
136 static int tui_old_readline_echoing_p;
138 /* Readline output stream.
139 Should be removed when readline is clean. */
140 static FILE *tui_rl_outstream;
141 static FILE *tui_old_rl_outstream;
142 #ifdef TUI_USE_PIPE_FOR_READLINE
143 static int tui_readline_pipe[2];
146 /* The last gdb prompt that was registered in readline.
147 This may be the main gdb prompt or a secondary prompt. */
148 static char *tui_rl_saved_prompt;
150 static unsigned int tui_handle_resize_during_io (unsigned int);
162 /* Print the string in the curses command window. */
164 tui_puts (const char *string)
166 static int tui_skip_line = -1;
170 w = TUI_CMD_WIN->generic.handle;
171 while ((c = *string++) != 0)
173 /* Catch annotation and discard them. We need two \032 and
174 discard until a \n is seen. */
179 else if (tui_skip_line != 1)
187 getyx (w, TUI_CMD_WIN->detail.command_info.cur_line,
188 TUI_CMD_WIN->detail.command_info.curch);
189 TUI_CMD_WIN->detail.command_info.start_line
190 = TUI_CMD_WIN->detail.command_info.cur_line;
192 /* We could defer the following. */
197 /* Readline callback.
198 Redisplay the command line with its prompt after readline has
199 changed the edited text. */
201 tui_redisplay_readline (void)
213 /* Detect when we temporarily left SingleKey and now the readline
214 edit buffer is empty, automatically restore the SingleKey
216 if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0)
217 tui_set_key_mode (TUI_SINGLE_KEY_MODE);
219 if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
222 prompt = tui_rl_saved_prompt;
226 w = TUI_CMD_WIN->generic.handle;
227 start_line = TUI_CMD_WIN->detail.command_info.start_line;
228 wmove (w, start_line, 0);
231 for (in = 0; prompt && prompt[in]; in++)
233 waddch (w, prompt[in]);
234 getyx (w, line, col);
239 for (in = 0; in < rl_end; in++)
243 c = (unsigned char) rl_line_buffer[in];
246 getyx (w, c_line, c_pos);
249 if (CTRL_CHAR (c) || c == RUBOUT)
252 waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
260 getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
261 TUI_CMD_WIN->detail.command_info.curch);
263 getyx (w, line, col);
269 getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
270 TUI_CMD_WIN->detail.command_info.curch);
273 wmove (w, c_line, c_pos);
274 TUI_CMD_WIN->detail.command_info.cur_line = c_line;
275 TUI_CMD_WIN->detail.command_info.curch = c_pos;
277 TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
283 /* Readline callback to prepare the terminal. It is called once each
284 time we enter readline. Terminal is already setup in curses
287 tui_prep_terminal (int notused1)
289 /* Save the prompt registered in readline to correctly display it.
290 (we can't use gdb_prompt() due to secondary prompts and can't use
291 rl_prompt because it points to an alloca buffer). */
292 xfree (tui_rl_saved_prompt);
293 tui_rl_saved_prompt = xstrdup (rl_prompt);
296 /* Readline callback to restore the terminal. It is called once each
297 time we leave readline. There is nothing to do in curses mode. */
299 tui_deprep_terminal (void)
303 #ifdef TUI_USE_PIPE_FOR_READLINE
304 /* Read readline output pipe and feed the command window with it.
305 Should be removed when readline is clean. */
307 tui_readline_output (int error, gdb_client_data data)
312 size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
313 if (size > 0 && tui_active)
321 /* Return the portion of PATHNAME that should be output when listing
322 possible completions. If we are hacking filename completion, we
323 are only interested in the basename, the portion following the
324 final slash. Otherwise, we return what we were passed.
326 Comes from readline/complete.c. */
328 printable_part (char *pathname)
332 temp = rl_filename_completion_desired
333 ? strrchr (pathname, '/') : (char *)NULL;
334 #if defined (__MSDOS__)
335 if (rl_filename_completion_desired
336 && temp == 0 && isalpha (pathname[0])
337 && pathname[1] == ':')
340 return (temp ? ++temp : pathname);
343 /* Output TO_PRINT to rl_outstream. If VISIBLE_STATS is defined and
344 we are using it, check for and output a single character for
345 `special' filenames. Return the number of characters we
353 tui_putc (UNCTRL (c)); \
356 else if (c == RUBOUT) \
369 print_filename (char *to_print, char *full_pathname)
374 for (s = to_print; *s; s++)
381 /* The user must press "y" or "n". Non-zero return means "y" pressed.
382 Comes from readline/complete.c. */
386 extern int _rl_abort_internal ();
392 if (c == 'y' || c == 'Y' || c == ' ')
394 if (c == 'n' || c == 'N' || c == RUBOUT)
397 _rl_abort_internal ();
402 /* A convenience function for displaying a list of strings in
403 columnar format on readline's output stream. MATCHES is the list
404 of strings, in argv format, LEN is the number of strings in MATCHES,
405 and MAX is the length of the longest string in MATCHES.
407 Comes from readline/complete.c and modified to write in
408 the TUI command window using tui_putc/tui_puts. */
410 tui_rl_display_match_list (char **matches, int len, int max)
412 typedef int QSFUNC (const void *, const void *);
413 extern int _rl_qsort_string_compare (const void *,
415 extern int _rl_print_completions_horizontally;
417 int count, limit, printed_len;
421 /* Screen dimension correspond to the TUI command window. */
422 int screenwidth = TUI_CMD_WIN->generic.width;
424 /* If there are many items, then ask the user if she really wants to
426 if (len >= rl_completion_query_items)
430 sprintf (msg, "\nDisplay all %d possibilities? (y or n)", len);
432 if (get_y_or_n () == 0)
439 /* How many items of MAX length can we fit in the screen window? */
441 limit = screenwidth / max;
442 if (limit != 1 && (limit * max == screenwidth))
445 /* Avoid a possible floating exception. If max > screenwidth, limit
446 will be 0 and a divide-by-zero fault will result. */
450 /* How many iterations of the printing loop? */
451 count = (len + (limit - 1)) / limit;
453 /* Watch out for special case. If LEN is less than LIMIT, then
454 just do the inner printing loop.
455 0 < len <= limit implies count = 1. */
457 /* Sort the items if they are not already sorted. */
458 if (rl_ignore_completion_duplicates == 0)
459 qsort (matches + 1, len, sizeof (char *),
460 (QSFUNC *)_rl_qsort_string_compare);
464 if (_rl_print_completions_horizontally == 0)
466 /* Print the sorted items, up-and-down alphabetically, like ls. */
467 for (i = 1; i <= count; i++)
469 for (j = 0, l = i; j < limit; j++)
471 if (l > len || matches[l] == 0)
475 temp = printable_part (matches[l]);
476 printed_len = print_filename (temp, matches[l]);
479 for (k = 0; k < max - printed_len; k++)
489 /* Print the sorted items, across alphabetically, like ls -x. */
490 for (i = 1; matches[i]; i++)
492 temp = printable_part (matches[i]);
493 printed_len = print_filename (temp, matches[i]);
494 /* Have we reached the end of this line? */
497 if (i && (limit > 1) && (i % limit) == 0)
500 for (k = 0; k < max - printed_len; k++)
508 /* Setup the IO for curses or non-curses mode.
509 - In non-curses mode, readline and gdb use the standard input and
510 standard output/error directly.
511 - In curses mode, the standard output/error is controlled by TUI
512 with the tui_stdout and tui_stderr. The output is redirected in
513 the curses command window. Several readline callbacks are installed
514 so that readline asks for its input to the curses command window
517 tui_setup_io (int mode)
519 extern int readline_echoing_p;
523 /* Redirect readline to TUI. */
524 tui_old_rl_redisplay_function = rl_redisplay_function;
525 tui_old_rl_deprep_terminal = rl_deprep_term_function;
526 tui_old_rl_prep_terminal = rl_prep_term_function;
527 tui_old_rl_getc_function = rl_getc_function;
528 tui_old_rl_outstream = rl_outstream;
529 tui_old_readline_echoing_p = readline_echoing_p;
530 rl_redisplay_function = tui_redisplay_readline;
531 rl_deprep_term_function = tui_deprep_terminal;
532 rl_prep_term_function = tui_prep_terminal;
533 rl_getc_function = tui_getc;
534 readline_echoing_p = 0;
535 rl_outstream = tui_rl_outstream;
537 rl_completion_display_matches_hook = tui_rl_display_match_list;
538 rl_already_prompted = 0;
540 /* Keep track of previous gdb output. */
541 tui_old_stdout = gdb_stdout;
542 tui_old_stderr = gdb_stderr;
543 tui_old_uiout = uiout;
545 /* Reconfigure gdb output. */
546 gdb_stdout = tui_stdout;
547 gdb_stderr = tui_stderr;
548 gdb_stdlog = gdb_stdout; /* for moment */
549 gdb_stdtarg = gdb_stderr; /* for moment */
550 gdb_stdtargerr = gdb_stderr; /* for moment */
553 /* Save tty for SIGCONT. */
558 /* Restore gdb output. */
559 gdb_stdout = tui_old_stdout;
560 gdb_stderr = tui_old_stderr;
561 gdb_stdlog = gdb_stdout; /* for moment */
562 gdb_stdtarg = gdb_stderr; /* for moment */
563 gdb_stdtargerr = gdb_stderr; /* for moment */
564 uiout = tui_old_uiout;
566 /* Restore readline. */
567 rl_redisplay_function = tui_old_rl_redisplay_function;
568 rl_deprep_term_function = tui_old_rl_deprep_terminal;
569 rl_prep_term_function = tui_old_rl_prep_terminal;
570 rl_getc_function = tui_old_rl_getc_function;
571 rl_outstream = tui_old_rl_outstream;
572 rl_completion_display_matches_hook = 0;
573 readline_echoing_p = tui_old_readline_echoing_p;
574 rl_already_prompted = 0;
576 /* Save tty for SIGCONT. */
582 /* Catch SIGCONT to restore the terminal and refresh the screen. */
584 tui_cont_sig (int sig)
588 /* Restore the terminal setting because another process (shell)
589 might have changed it. */
592 /* Force a refresh of the screen. */
593 tui_refresh_all_win ();
595 /* Update cursor position on the screen. */
596 wmove (TUI_CMD_WIN->generic.handle,
597 TUI_CMD_WIN->detail.command_info.start_line,
598 TUI_CMD_WIN->detail.command_info.curch);
599 wrefresh (TUI_CMD_WIN->generic.handle);
601 signal (sig, tui_cont_sig);
605 /* Initialize the IO for gdb in curses mode. */
607 tui_initialize_io (void)
610 signal (SIGCONT, tui_cont_sig);
613 /* Create tui output streams. */
614 tui_stdout = tui_fileopen (stdout);
615 tui_stderr = tui_fileopen (stderr);
616 tui_out = tui_out_new (tui_stdout);
618 /* Create the default UI. It is not created because we installed a
619 deprecated_init_ui_hook. */
620 tui_old_uiout = uiout = cli_out_new (gdb_stdout);
622 #ifdef TUI_USE_PIPE_FOR_READLINE
623 /* Temporary solution for readline writing to stdout: redirect
624 readline output in a pipe, read that pipe and output the content
625 in the curses command window. */
626 if (pipe (tui_readline_pipe) != 0)
628 fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
631 tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
632 if (tui_rl_outstream == 0)
634 fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
637 setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
640 (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
643 (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
646 add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
648 tui_rl_outstream = stdout;
652 /* Get a character from the command window. This is called from the
660 w = TUI_CMD_WIN->generic.handle;
662 #ifdef TUI_USE_PIPE_FOR_READLINE
663 /* Flush readline output. */
664 tui_readline_output (0, 0);
668 ch = tui_handle_resize_during_io (ch);
670 /* The \n must be echoed because it will not be printed by
674 /* When hitting return with an empty input, gdb executes the last
675 command. If we emit a newline, this fills up the command window
676 with empty lines with gdb prompt at beginning. Instead of that,
677 stay on the same line but provide a visual effect to show the
678 user we recognized the command. */
681 wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
683 /* Clear the line. This will blink the gdb prompt since
684 it will be redrawn at the same line. */
691 wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
692 TUI_CMD_WIN->detail.command_info.curch);
697 if (key_is_command_char (ch))
698 { /* Handle prev/next/up/down here. */
699 ch = tui_dispatch_ctrl_char (ch);
702 if (ch == '\n' || ch == '\r' || ch == '\f')
703 TUI_CMD_WIN->detail.command_info.curch = 0;
704 if (ch == KEY_BACKSPACE)
711 /* Cleanup when a resize has occured.
712 Returns the character that must be processed. */
714 tui_handle_resize_during_io (unsigned int original_ch)
716 if (tui_win_resized ())
719 tui_refresh_all_win ();
721 tui_set_win_resized_to (FALSE);