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1 | /* TUI support I/O functions. | |
2 | ||
3 | Copyright (C) 1998-2013 Free Software Foundation, Inc. | |
4 | ||
5 | Contributed by Hewlett-Packard Company. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
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. | |
13 | ||
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. | |
18 | ||
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/>. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "target.h" | |
24 | #include "event-loop.h" | |
25 | #include "event-top.h" | |
26 | #include "command.h" | |
27 | #include "top.h" | |
28 | #include "tui/tui.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 "ui-out.h" | |
36 | #include "cli-out.h" | |
37 | #include <fcntl.h> | |
38 | #include <signal.h> | |
39 | #include <stdio.h> | |
40 | ||
41 | #include "gdb_curses.h" | |
42 | ||
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 | |
45 | "gdb_curses.h". */ | |
46 | #include "readline/readline.h" | |
47 | ||
48 | int | |
49 | key_is_start_sequence (int ch) | |
50 | { | |
51 | return (ch == 27); | |
52 | } | |
53 | ||
54 | int | |
55 | key_is_end_sequence (int ch) | |
56 | { | |
57 | return (ch == 126); | |
58 | } | |
59 | ||
60 | int | |
61 | key_is_backspace (int ch) | |
62 | { | |
63 | return (ch == 8); | |
64 | } | |
65 | ||
66 | int | |
67 | key_is_command_char (int ch) | |
68 | { | |
69 | return ((ch == KEY_NPAGE) || (ch == KEY_PPAGE) | |
70 | || (ch == KEY_LEFT) || (ch == KEY_RIGHT) | |
71 | || (ch == KEY_UP) || (ch == KEY_DOWN) | |
72 | || (ch == KEY_SF) || (ch == KEY_SR) | |
73 | || (ch == (int)'\f') | |
74 | || key_is_start_sequence (ch)); | |
75 | } | |
76 | ||
77 | /* Use definition from readline 4.3. */ | |
78 | #undef CTRL_CHAR | |
79 | #define CTRL_CHAR(c) \ | |
80 | ((c) < control_character_threshold && (((c) & 0x80) == 0)) | |
81 | ||
82 | /* This file controls the IO interactions between gdb and curses. | |
83 | When the TUI is enabled, gdb has two modes a curses and a standard | |
84 | mode. | |
85 | ||
86 | In curses mode, the gdb outputs are made in a curses command | |
87 | window. For this, the gdb_stdout and gdb_stderr are redirected to | |
88 | the specific ui_file implemented by TUI. The output is handled by | |
89 | tui_puts(). The input is also controlled by curses with | |
90 | tui_getc(). The readline library uses this function to get its | |
91 | input. Several readline hooks are installed to redirect readline | |
92 | output to the TUI (see also the note below). | |
93 | ||
94 | In normal mode, the gdb outputs are restored to their origin, that | |
95 | is as if TUI is not used. Readline also uses its original getc() | |
96 | function with stdin. | |
97 | ||
98 | Note SCz/2001-07-21: the current readline is not clean in its | |
99 | management of the output. Even if we install a redisplay handler, | |
100 | it sometimes writes on a stdout file. It is important to redirect | |
101 | every output produced by readline, otherwise the curses window will | |
102 | be garbled. This is implemented with a pipe that TUI reads and | |
103 | readline writes to. A gdb input handler is created so that reading | |
104 | the pipe is handled automatically. This will probably not work on | |
105 | non-Unix platforms. The best fix is to make readline clean enougth | |
106 | so that is never write on stdout. | |
107 | ||
108 | Note SCz/2002-09-01: we now use more readline hooks and it seems | |
109 | that with them we don't need the pipe anymore (verified by creating | |
110 | the pipe and closing its end so that write causes a SIGPIPE). The | |
111 | old pipe code is still there and can be conditionally removed by | |
112 | #undef TUI_USE_PIPE_FOR_READLINE. */ | |
113 | ||
114 | /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */ | |
115 | #ifdef HAVE_PIPE | |
116 | #define TUI_USE_PIPE_FOR_READLINE | |
117 | #endif | |
118 | /* #undef TUI_USE_PIPE_FOR_READLINE */ | |
119 | ||
120 | /* TUI output files. */ | |
121 | static struct ui_file *tui_stdout; | |
122 | static struct ui_file *tui_stderr; | |
123 | struct ui_out *tui_out; | |
124 | ||
125 | /* GDB output files in non-curses mode. */ | |
126 | static struct ui_file *tui_old_stdout; | |
127 | static struct ui_file *tui_old_stderr; | |
128 | struct ui_out *tui_old_uiout; | |
129 | ||
130 | /* Readline previous hooks. */ | |
131 | static Function *tui_old_rl_getc_function; | |
132 | static VFunction *tui_old_rl_redisplay_function; | |
133 | static VFunction *tui_old_rl_prep_terminal; | |
134 | static VFunction *tui_old_rl_deprep_terminal; | |
135 | static int tui_old_rl_echoing_p; | |
136 | ||
137 | /* Readline output stream. | |
138 | Should be removed when readline is clean. */ | |
139 | static FILE *tui_rl_outstream; | |
140 | static FILE *tui_old_rl_outstream; | |
141 | #ifdef TUI_USE_PIPE_FOR_READLINE | |
142 | static int tui_readline_pipe[2]; | |
143 | #endif | |
144 | ||
145 | /* The last gdb prompt that was registered in readline. | |
146 | This may be the main gdb prompt or a secondary prompt. */ | |
147 | static char *tui_rl_saved_prompt; | |
148 | ||
149 | static unsigned int tui_handle_resize_during_io (unsigned int); | |
150 | ||
151 | static void | |
152 | tui_putc (char c) | |
153 | { | |
154 | char buf[2]; | |
155 | ||
156 | buf[0] = c; | |
157 | buf[1] = 0; | |
158 | tui_puts (buf); | |
159 | } | |
160 | ||
161 | /* Print the string in the curses command window. */ | |
162 | void | |
163 | tui_puts (const char *string) | |
164 | { | |
165 | static int tui_skip_line = -1; | |
166 | char c; | |
167 | WINDOW *w; | |
168 | ||
169 | w = TUI_CMD_WIN->generic.handle; | |
170 | while ((c = *string++) != 0) | |
171 | { | |
172 | /* Catch annotation and discard them. We need two \032 and | |
173 | discard until a \n is seen. */ | |
174 | if (c == '\032') | |
175 | { | |
176 | tui_skip_line++; | |
177 | } | |
178 | else if (tui_skip_line != 1) | |
179 | { | |
180 | tui_skip_line = -1; | |
181 | waddch (w, c); | |
182 | } | |
183 | else if (c == '\n') | |
184 | tui_skip_line = -1; | |
185 | } | |
186 | getyx (w, TUI_CMD_WIN->detail.command_info.cur_line, | |
187 | TUI_CMD_WIN->detail.command_info.curch); | |
188 | TUI_CMD_WIN->detail.command_info.start_line | |
189 | = TUI_CMD_WIN->detail.command_info.cur_line; | |
190 | ||
191 | /* We could defer the following. */ | |
192 | wrefresh (w); | |
193 | fflush (stdout); | |
194 | } | |
195 | ||
196 | /* Readline callback. | |
197 | Redisplay the command line with its prompt after readline has | |
198 | changed the edited text. */ | |
199 | void | |
200 | tui_redisplay_readline (void) | |
201 | { | |
202 | int prev_col; | |
203 | int height; | |
204 | int col, line; | |
205 | int c_pos; | |
206 | int c_line; | |
207 | int in; | |
208 | WINDOW *w; | |
209 | char *prompt; | |
210 | int start_line; | |
211 | ||
212 | /* Detect when we temporarily left SingleKey and now the readline | |
213 | edit buffer is empty, automatically restore the SingleKey | |
214 | mode. The restore must only be done if the command has finished. | |
215 | The command could call prompt_for_continue and we must not | |
216 | restore SingleKey so that the prompt and normal keymap are used. */ | |
217 | if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0 | |
218 | && immediate_quit == 0) | |
219 | tui_set_key_mode (TUI_SINGLE_KEY_MODE); | |
220 | ||
221 | if (tui_current_key_mode == TUI_SINGLE_KEY_MODE) | |
222 | prompt = ""; | |
223 | else | |
224 | prompt = tui_rl_saved_prompt; | |
225 | ||
226 | c_pos = -1; | |
227 | c_line = -1; | |
228 | w = TUI_CMD_WIN->generic.handle; | |
229 | start_line = TUI_CMD_WIN->detail.command_info.start_line; | |
230 | wmove (w, start_line, 0); | |
231 | prev_col = 0; | |
232 | height = 1; | |
233 | for (in = 0; prompt && prompt[in]; in++) | |
234 | { | |
235 | waddch (w, prompt[in]); | |
236 | getyx (w, line, col); | |
237 | if (col < prev_col) | |
238 | height++; | |
239 | prev_col = col; | |
240 | } | |
241 | for (in = 0; in < rl_end; in++) | |
242 | { | |
243 | unsigned char c; | |
244 | ||
245 | c = (unsigned char) rl_line_buffer[in]; | |
246 | if (in == rl_point) | |
247 | { | |
248 | getyx (w, c_line, c_pos); | |
249 | } | |
250 | ||
251 | if (CTRL_CHAR (c) || c == RUBOUT) | |
252 | { | |
253 | waddch (w, '^'); | |
254 | waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?'); | |
255 | } | |
256 | else | |
257 | { | |
258 | waddch (w, c); | |
259 | } | |
260 | if (c == '\n') | |
261 | { | |
262 | getyx (w, TUI_CMD_WIN->detail.command_info.start_line, | |
263 | TUI_CMD_WIN->detail.command_info.curch); | |
264 | } | |
265 | getyx (w, line, col); | |
266 | if (col < prev_col) | |
267 | height++; | |
268 | prev_col = col; | |
269 | } | |
270 | wclrtobot (w); | |
271 | getyx (w, TUI_CMD_WIN->detail.command_info.start_line, | |
272 | TUI_CMD_WIN->detail.command_info.curch); | |
273 | if (c_line >= 0) | |
274 | { | |
275 | wmove (w, c_line, c_pos); | |
276 | TUI_CMD_WIN->detail.command_info.cur_line = c_line; | |
277 | TUI_CMD_WIN->detail.command_info.curch = c_pos; | |
278 | } | |
279 | TUI_CMD_WIN->detail.command_info.start_line -= height - 1; | |
280 | ||
281 | wrefresh (w); | |
282 | fflush(stdout); | |
283 | } | |
284 | ||
285 | /* Readline callback to prepare the terminal. It is called once each | |
286 | time we enter readline. Terminal is already setup in curses | |
287 | mode. */ | |
288 | static void | |
289 | tui_prep_terminal (int notused1) | |
290 | { | |
291 | /* Save the prompt registered in readline to correctly display it. | |
292 | (we can't use gdb_prompt() due to secondary prompts and can't use | |
293 | rl_prompt because it points to an alloca buffer). */ | |
294 | xfree (tui_rl_saved_prompt); | |
295 | tui_rl_saved_prompt = xstrdup (rl_prompt); | |
296 | } | |
297 | ||
298 | /* Readline callback to restore the terminal. It is called once each | |
299 | time we leave readline. There is nothing to do in curses mode. */ | |
300 | static void | |
301 | tui_deprep_terminal (void) | |
302 | { | |
303 | } | |
304 | ||
305 | #ifdef TUI_USE_PIPE_FOR_READLINE | |
306 | /* Read readline output pipe and feed the command window with it. | |
307 | Should be removed when readline is clean. */ | |
308 | static void | |
309 | tui_readline_output (int error, gdb_client_data data) | |
310 | { | |
311 | int size; | |
312 | char buf[256]; | |
313 | ||
314 | size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1); | |
315 | if (size > 0 && tui_active) | |
316 | { | |
317 | buf[size] = 0; | |
318 | tui_puts (buf); | |
319 | } | |
320 | } | |
321 | #endif | |
322 | ||
323 | /* Return the portion of PATHNAME that should be output when listing | |
324 | possible completions. If we are hacking filename completion, we | |
325 | are only interested in the basename, the portion following the | |
326 | final slash. Otherwise, we return what we were passed. | |
327 | ||
328 | Comes from readline/complete.c. */ | |
329 | static const char * | |
330 | printable_part (const char *pathname) | |
331 | { | |
332 | return rl_filename_completion_desired ? lbasename (pathname) : pathname; | |
333 | } | |
334 | ||
335 | /* Output TO_PRINT to rl_outstream. If VISIBLE_STATS is defined and | |
336 | we are using it, check for and output a single character for | |
337 | `special' filenames. Return the number of characters we | |
338 | output. */ | |
339 | ||
340 | #define PUTX(c) \ | |
341 | do { \ | |
342 | if (CTRL_CHAR (c)) \ | |
343 | { \ | |
344 | tui_puts ("^"); \ | |
345 | tui_putc (UNCTRL (c)); \ | |
346 | printed_len += 2; \ | |
347 | } \ | |
348 | else if (c == RUBOUT) \ | |
349 | { \ | |
350 | tui_puts ("^?"); \ | |
351 | printed_len += 2; \ | |
352 | } \ | |
353 | else \ | |
354 | { \ | |
355 | tui_putc (c); \ | |
356 | printed_len++; \ | |
357 | } \ | |
358 | } while (0) | |
359 | ||
360 | static int | |
361 | print_filename (const char *to_print, const char *full_pathname) | |
362 | { | |
363 | int printed_len = 0; | |
364 | const char *s; | |
365 | ||
366 | for (s = to_print; *s; s++) | |
367 | { | |
368 | PUTX (*s); | |
369 | } | |
370 | return printed_len; | |
371 | } | |
372 | ||
373 | /* The user must press "y" or "n". Non-zero return means "y" pressed. | |
374 | Comes from readline/complete.c. */ | |
375 | static int | |
376 | get_y_or_n (void) | |
377 | { | |
378 | extern int _rl_abort_internal (); | |
379 | int c; | |
380 | ||
381 | for (;;) | |
382 | { | |
383 | c = rl_read_key (); | |
384 | if (c == 'y' || c == 'Y' || c == ' ') | |
385 | return (1); | |
386 | if (c == 'n' || c == 'N' || c == RUBOUT) | |
387 | return (0); | |
388 | if (c == ABORT_CHAR) | |
389 | _rl_abort_internal (); | |
390 | beep (); | |
391 | } | |
392 | } | |
393 | ||
394 | /* A convenience function for displaying a list of strings in | |
395 | columnar format on readline's output stream. MATCHES is the list | |
396 | of strings, in argv format, LEN is the number of strings in MATCHES, | |
397 | and MAX is the length of the longest string in MATCHES. | |
398 | ||
399 | Comes from readline/complete.c and modified to write in | |
400 | the TUI command window using tui_putc/tui_puts. */ | |
401 | static void | |
402 | tui_rl_display_match_list (char **matches, int len, int max) | |
403 | { | |
404 | typedef int QSFUNC (const void *, const void *); | |
405 | extern int _rl_qsort_string_compare (const void *, | |
406 | const void *); | |
407 | extern int _rl_print_completions_horizontally; | |
408 | ||
409 | int count, limit, printed_len; | |
410 | int i, j, k, l; | |
411 | const char *temp; | |
412 | ||
413 | /* Screen dimension correspond to the TUI command window. */ | |
414 | int screenwidth = TUI_CMD_WIN->generic.width; | |
415 | ||
416 | /* If there are many items, then ask the user if she really wants to | |
417 | see them all. */ | |
418 | if (len >= rl_completion_query_items) | |
419 | { | |
420 | char msg[256]; | |
421 | ||
422 | xsnprintf (msg, sizeof (msg), | |
423 | "\nDisplay all %d possibilities? (y or n)", len); | |
424 | tui_puts (msg); | |
425 | if (get_y_or_n () == 0) | |
426 | { | |
427 | tui_puts ("\n"); | |
428 | return; | |
429 | } | |
430 | } | |
431 | ||
432 | /* How many items of MAX length can we fit in the screen window? */ | |
433 | max += 2; | |
434 | limit = screenwidth / max; | |
435 | if (limit != 1 && (limit * max == screenwidth)) | |
436 | limit--; | |
437 | ||
438 | /* Avoid a possible floating exception. If max > screenwidth, limit | |
439 | will be 0 and a divide-by-zero fault will result. */ | |
440 | if (limit == 0) | |
441 | limit = 1; | |
442 | ||
443 | /* How many iterations of the printing loop? */ | |
444 | count = (len + (limit - 1)) / limit; | |
445 | ||
446 | /* Watch out for special case. If LEN is less than LIMIT, then | |
447 | just do the inner printing loop. | |
448 | 0 < len <= limit implies count = 1. */ | |
449 | ||
450 | /* Sort the items if they are not already sorted. */ | |
451 | if (rl_ignore_completion_duplicates == 0) | |
452 | qsort (matches + 1, len, sizeof (char *), | |
453 | (QSFUNC *)_rl_qsort_string_compare); | |
454 | ||
455 | tui_putc ('\n'); | |
456 | ||
457 | if (_rl_print_completions_horizontally == 0) | |
458 | { | |
459 | /* Print the sorted items, up-and-down alphabetically, like ls. */ | |
460 | for (i = 1; i <= count; i++) | |
461 | { | |
462 | for (j = 0, l = i; j < limit; j++) | |
463 | { | |
464 | if (l > len || matches[l] == 0) | |
465 | break; | |
466 | else | |
467 | { | |
468 | temp = printable_part (matches[l]); | |
469 | printed_len = print_filename (temp, matches[l]); | |
470 | ||
471 | if (j + 1 < limit) | |
472 | for (k = 0; k < max - printed_len; k++) | |
473 | tui_putc (' '); | |
474 | } | |
475 | l += count; | |
476 | } | |
477 | tui_putc ('\n'); | |
478 | } | |
479 | } | |
480 | else | |
481 | { | |
482 | /* Print the sorted items, across alphabetically, like ls -x. */ | |
483 | for (i = 1; matches[i]; i++) | |
484 | { | |
485 | temp = printable_part (matches[i]); | |
486 | printed_len = print_filename (temp, matches[i]); | |
487 | /* Have we reached the end of this line? */ | |
488 | if (matches[i+1]) | |
489 | { | |
490 | if (i && (limit > 1) && (i % limit) == 0) | |
491 | tui_putc ('\n'); | |
492 | else | |
493 | for (k = 0; k < max - printed_len; k++) | |
494 | tui_putc (' '); | |
495 | } | |
496 | } | |
497 | tui_putc ('\n'); | |
498 | } | |
499 | } | |
500 | ||
501 | /* Setup the IO for curses or non-curses mode. | |
502 | - In non-curses mode, readline and gdb use the standard input and | |
503 | standard output/error directly. | |
504 | - In curses mode, the standard output/error is controlled by TUI | |
505 | with the tui_stdout and tui_stderr. The output is redirected in | |
506 | the curses command window. Several readline callbacks are installed | |
507 | so that readline asks for its input to the curses command window | |
508 | with wgetch(). */ | |
509 | void | |
510 | tui_setup_io (int mode) | |
511 | { | |
512 | extern int _rl_echoing_p; | |
513 | ||
514 | if (mode) | |
515 | { | |
516 | /* Redirect readline to TUI. */ | |
517 | tui_old_rl_redisplay_function = rl_redisplay_function; | |
518 | tui_old_rl_deprep_terminal = rl_deprep_term_function; | |
519 | tui_old_rl_prep_terminal = rl_prep_term_function; | |
520 | tui_old_rl_getc_function = rl_getc_function; | |
521 | tui_old_rl_outstream = rl_outstream; | |
522 | tui_old_rl_echoing_p = _rl_echoing_p; | |
523 | rl_redisplay_function = tui_redisplay_readline; | |
524 | rl_deprep_term_function = tui_deprep_terminal; | |
525 | rl_prep_term_function = tui_prep_terminal; | |
526 | rl_getc_function = tui_getc; | |
527 | _rl_echoing_p = 0; | |
528 | rl_outstream = tui_rl_outstream; | |
529 | rl_prompt = 0; | |
530 | rl_completion_display_matches_hook = tui_rl_display_match_list; | |
531 | rl_already_prompted = 0; | |
532 | ||
533 | /* Keep track of previous gdb output. */ | |
534 | tui_old_stdout = gdb_stdout; | |
535 | tui_old_stderr = gdb_stderr; | |
536 | tui_old_uiout = current_uiout; | |
537 | ||
538 | /* Reconfigure gdb output. */ | |
539 | gdb_stdout = tui_stdout; | |
540 | gdb_stderr = tui_stderr; | |
541 | gdb_stdlog = gdb_stdout; /* for moment */ | |
542 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
543 | gdb_stdtargerr = gdb_stderr; /* for moment */ | |
544 | current_uiout = tui_out; | |
545 | ||
546 | /* Save tty for SIGCONT. */ | |
547 | savetty (); | |
548 | } | |
549 | else | |
550 | { | |
551 | /* Restore gdb output. */ | |
552 | gdb_stdout = tui_old_stdout; | |
553 | gdb_stderr = tui_old_stderr; | |
554 | gdb_stdlog = gdb_stdout; /* for moment */ | |
555 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
556 | gdb_stdtargerr = gdb_stderr; /* for moment */ | |
557 | current_uiout = tui_old_uiout; | |
558 | ||
559 | /* Restore readline. */ | |
560 | rl_redisplay_function = tui_old_rl_redisplay_function; | |
561 | rl_deprep_term_function = tui_old_rl_deprep_terminal; | |
562 | rl_prep_term_function = tui_old_rl_prep_terminal; | |
563 | rl_getc_function = tui_old_rl_getc_function; | |
564 | rl_outstream = tui_old_rl_outstream; | |
565 | rl_completion_display_matches_hook = 0; | |
566 | _rl_echoing_p = tui_old_rl_echoing_p; | |
567 | rl_already_prompted = 0; | |
568 | ||
569 | /* Save tty for SIGCONT. */ | |
570 | savetty (); | |
571 | } | |
572 | } | |
573 | ||
574 | #ifdef SIGCONT | |
575 | /* Catch SIGCONT to restore the terminal and refresh the screen. */ | |
576 | static void | |
577 | tui_cont_sig (int sig) | |
578 | { | |
579 | if (tui_active) | |
580 | { | |
581 | /* Restore the terminal setting because another process (shell) | |
582 | might have changed it. */ | |
583 | resetty (); | |
584 | ||
585 | /* Force a refresh of the screen. */ | |
586 | tui_refresh_all_win (); | |
587 | ||
588 | /* Update cursor position on the screen. */ | |
589 | wmove (TUI_CMD_WIN->generic.handle, | |
590 | TUI_CMD_WIN->detail.command_info.start_line, | |
591 | TUI_CMD_WIN->detail.command_info.curch); | |
592 | wrefresh (TUI_CMD_WIN->generic.handle); | |
593 | } | |
594 | signal (sig, tui_cont_sig); | |
595 | } | |
596 | #endif | |
597 | ||
598 | /* Initialize the IO for gdb in curses mode. */ | |
599 | void | |
600 | tui_initialize_io (void) | |
601 | { | |
602 | #ifdef SIGCONT | |
603 | signal (SIGCONT, tui_cont_sig); | |
604 | #endif | |
605 | ||
606 | /* Create tui output streams. */ | |
607 | tui_stdout = tui_fileopen (stdout); | |
608 | tui_stderr = tui_fileopen (stderr); | |
609 | tui_out = tui_out_new (tui_stdout); | |
610 | ||
611 | /* Create the default UI. It is not created because we installed a | |
612 | deprecated_init_ui_hook. */ | |
613 | tui_old_uiout = cli_out_new (gdb_stdout); | |
614 | ||
615 | #ifdef TUI_USE_PIPE_FOR_READLINE | |
616 | /* Temporary solution for readline writing to stdout: redirect | |
617 | readline output in a pipe, read that pipe and output the content | |
618 | in the curses command window. */ | |
619 | if (pipe (tui_readline_pipe) != 0) | |
620 | { | |
621 | fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline"); | |
622 | exit (1); | |
623 | } | |
624 | tui_rl_outstream = fdopen (tui_readline_pipe[1], "w"); | |
625 | if (tui_rl_outstream == 0) | |
626 | { | |
627 | fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output"); | |
628 | exit (1); | |
629 | } | |
630 | setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0); | |
631 | ||
632 | #ifdef O_NONBLOCK | |
633 | (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK); | |
634 | #else | |
635 | #ifdef O_NDELAY | |
636 | (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY); | |
637 | #endif | |
638 | #endif | |
639 | add_file_handler (tui_readline_pipe[0], tui_readline_output, 0); | |
640 | #else | |
641 | tui_rl_outstream = stdout; | |
642 | #endif | |
643 | } | |
644 | ||
645 | /* Get a character from the command window. This is called from the | |
646 | readline package. */ | |
647 | int | |
648 | tui_getc (FILE *fp) | |
649 | { | |
650 | int ch; | |
651 | WINDOW *w; | |
652 | ||
653 | w = TUI_CMD_WIN->generic.handle; | |
654 | ||
655 | #ifdef TUI_USE_PIPE_FOR_READLINE | |
656 | /* Flush readline output. */ | |
657 | tui_readline_output (0, 0); | |
658 | #endif | |
659 | ||
660 | ch = wgetch (w); | |
661 | ch = tui_handle_resize_during_io (ch); | |
662 | ||
663 | /* The \n must be echoed because it will not be printed by | |
664 | readline. */ | |
665 | if (ch == '\n') | |
666 | { | |
667 | /* When hitting return with an empty input, gdb executes the last | |
668 | command. If we emit a newline, this fills up the command window | |
669 | with empty lines with gdb prompt at beginning. Instead of that, | |
670 | stay on the same line but provide a visual effect to show the | |
671 | user we recognized the command. */ | |
672 | if (rl_end == 0) | |
673 | { | |
674 | wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0); | |
675 | ||
676 | /* Clear the line. This will blink the gdb prompt since | |
677 | it will be redrawn at the same line. */ | |
678 | wclrtoeol (w); | |
679 | wrefresh (w); | |
680 | napms (20); | |
681 | } | |
682 | else | |
683 | { | |
684 | wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, | |
685 | TUI_CMD_WIN->detail.command_info.curch); | |
686 | waddch (w, ch); | |
687 | } | |
688 | } | |
689 | ||
690 | if (key_is_command_char (ch)) | |
691 | { /* Handle prev/next/up/down here. */ | |
692 | ch = tui_dispatch_ctrl_char (ch); | |
693 | } | |
694 | ||
695 | if (ch == '\n' || ch == '\r' || ch == '\f') | |
696 | TUI_CMD_WIN->detail.command_info.curch = 0; | |
697 | if (ch == KEY_BACKSPACE) | |
698 | return '\b'; | |
699 | ||
700 | return ch; | |
701 | } | |
702 | ||
703 | ||
704 | /* Cleanup when a resize has occured. | |
705 | Returns the character that must be processed. */ | |
706 | static unsigned int | |
707 | tui_handle_resize_during_io (unsigned int original_ch) | |
708 | { | |
709 | if (tui_win_resized ()) | |
710 | { | |
711 | tui_resize_all (); | |
712 | tui_refresh_all_win (); | |
713 | dont_repeat (); | |
714 | tui_set_win_resized_to (FALSE); | |
715 | return '\n'; | |
716 | } | |
717 | else | |
718 | return original_ch; | |
719 | } |