| 1 | /* TUI support I/O functions. |
| 2 | |
| 3 | Copyright (C) 1998-2018 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 "tui/tui-out.h" |
| 36 | #include "ui-out.h" |
| 37 | #include "cli-out.h" |
| 38 | #include <fcntl.h> |
| 39 | #include <signal.h> |
| 40 | #include "filestuff.h" |
| 41 | #include "completer.h" |
| 42 | #include "gdb_curses.h" |
| 43 | |
| 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 |
| 46 | "gdb_curses.h". */ |
| 47 | #include "readline/readline.h" |
| 48 | |
| 49 | int |
| 50 | key_is_start_sequence (int ch) |
| 51 | { |
| 52 | return (ch == 27); |
| 53 | } |
| 54 | |
| 55 | int |
| 56 | key_is_end_sequence (int ch) |
| 57 | { |
| 58 | return (ch == 126); |
| 59 | } |
| 60 | |
| 61 | int |
| 62 | key_is_backspace (int ch) |
| 63 | { |
| 64 | return (ch == 8); |
| 65 | } |
| 66 | |
| 67 | /* Use definition from readline 4.3. */ |
| 68 | #undef CTRL_CHAR |
| 69 | #define CTRL_CHAR(c) \ |
| 70 | ((c) < control_character_threshold && (((c) & 0x80) == 0)) |
| 71 | |
| 72 | /* This file controls the IO interactions between gdb and curses. |
| 73 | When the TUI is enabled, gdb has two modes a curses and a standard |
| 74 | mode. |
| 75 | |
| 76 | In curses mode, the gdb outputs are made in a curses command |
| 77 | window. For this, the gdb_stdout and gdb_stderr are redirected to |
| 78 | the specific ui_file implemented by TUI. The output is handled by |
| 79 | tui_puts(). The input is also controlled by curses with |
| 80 | tui_getc(). The readline library uses this function to get its |
| 81 | input. Several readline hooks are installed to redirect readline |
| 82 | output to the TUI (see also the note below). |
| 83 | |
| 84 | In normal mode, the gdb outputs are restored to their origin, that |
| 85 | is as if TUI is not used. Readline also uses its original getc() |
| 86 | function with stdin. |
| 87 | |
| 88 | Note SCz/2001-07-21: the current readline is not clean in its |
| 89 | management of the output. Even if we install a redisplay handler, |
| 90 | it sometimes writes on a stdout file. It is important to redirect |
| 91 | every output produced by readline, otherwise the curses window will |
| 92 | be garbled. This is implemented with a pipe that TUI reads and |
| 93 | readline writes to. A gdb input handler is created so that reading |
| 94 | the pipe is handled automatically. This will probably not work on |
| 95 | non-Unix platforms. The best fix is to make readline clean enougth |
| 96 | so that is never write on stdout. |
| 97 | |
| 98 | Note SCz/2002-09-01: we now use more readline hooks and it seems |
| 99 | that with them we don't need the pipe anymore (verified by creating |
| 100 | the pipe and closing its end so that write causes a SIGPIPE). The |
| 101 | old pipe code is still there and can be conditionally removed by |
| 102 | #undef TUI_USE_PIPE_FOR_READLINE. */ |
| 103 | |
| 104 | /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */ |
| 105 | #ifdef HAVE_PIPE |
| 106 | #define TUI_USE_PIPE_FOR_READLINE |
| 107 | #endif |
| 108 | /* #undef TUI_USE_PIPE_FOR_READLINE */ |
| 109 | |
| 110 | /* TUI output files. */ |
| 111 | static struct ui_file *tui_stdout; |
| 112 | static struct ui_file *tui_stderr; |
| 113 | struct ui_out *tui_out; |
| 114 | |
| 115 | /* GDB output files in non-curses mode. */ |
| 116 | static struct ui_file *tui_old_stdout; |
| 117 | static struct ui_file *tui_old_stderr; |
| 118 | cli_ui_out *tui_old_uiout; |
| 119 | |
| 120 | /* Readline previous hooks. */ |
| 121 | static rl_getc_func_t *tui_old_rl_getc_function; |
| 122 | static rl_voidfunc_t *tui_old_rl_redisplay_function; |
| 123 | static rl_vintfunc_t *tui_old_rl_prep_terminal; |
| 124 | static rl_voidfunc_t *tui_old_rl_deprep_terminal; |
| 125 | static rl_compdisp_func_t *tui_old_rl_display_matches_hook; |
| 126 | static int tui_old_rl_echoing_p; |
| 127 | |
| 128 | /* Readline output stream. |
| 129 | Should be removed when readline is clean. */ |
| 130 | static FILE *tui_rl_outstream; |
| 131 | static FILE *tui_old_rl_outstream; |
| 132 | #ifdef TUI_USE_PIPE_FOR_READLINE |
| 133 | static int tui_readline_pipe[2]; |
| 134 | #endif |
| 135 | |
| 136 | /* The last gdb prompt that was registered in readline. |
| 137 | This may be the main gdb prompt or a secondary prompt. */ |
| 138 | static char *tui_rl_saved_prompt; |
| 139 | |
| 140 | /* Print a character in the curses command window. The output is |
| 141 | buffered. It is up to the caller to refresh the screen if |
| 142 | necessary. */ |
| 143 | |
| 144 | static void |
| 145 | do_tui_putc (WINDOW *w, char c) |
| 146 | { |
| 147 | static int tui_skip_line = -1; |
| 148 | |
| 149 | /* Catch annotation and discard them. We need two \032 and discard |
| 150 | until a \n is seen. */ |
| 151 | if (c == '\032') |
| 152 | { |
| 153 | tui_skip_line++; |
| 154 | } |
| 155 | else if (tui_skip_line != 1) |
| 156 | { |
| 157 | tui_skip_line = -1; |
| 158 | /* Expand TABs, since ncurses on MS-Windows doesn't. */ |
| 159 | if (c == '\t') |
| 160 | { |
| 161 | int col; |
| 162 | |
| 163 | col = getcurx (w); |
| 164 | do |
| 165 | { |
| 166 | waddch (w, ' '); |
| 167 | col++; |
| 168 | } |
| 169 | while ((col % 8) != 0); |
| 170 | } |
| 171 | else |
| 172 | waddch (w, c); |
| 173 | } |
| 174 | else if (c == '\n') |
| 175 | tui_skip_line = -1; |
| 176 | } |
| 177 | |
| 178 | /* Update the cached value of the command window's start line based on |
| 179 | the window's current Y coordinate. */ |
| 180 | |
| 181 | static void |
| 182 | update_cmdwin_start_line () |
| 183 | { |
| 184 | TUI_CMD_WIN->detail.command_info.start_line |
| 185 | = getcury (TUI_CMD_WIN->generic.handle); |
| 186 | } |
| 187 | |
| 188 | /* Print a character in the curses command window. The output is |
| 189 | buffered. It is up to the caller to refresh the screen if |
| 190 | necessary. */ |
| 191 | |
| 192 | static void |
| 193 | tui_putc (char c) |
| 194 | { |
| 195 | WINDOW *w = TUI_CMD_WIN->generic.handle; |
| 196 | |
| 197 | do_tui_putc (w, c); |
| 198 | update_cmdwin_start_line (); |
| 199 | } |
| 200 | |
| 201 | /* Print LENGTH characters from the buffer pointed to by BUF to the |
| 202 | curses command window. The output is buffered. It is up to the |
| 203 | caller to refresh the screen if necessary. */ |
| 204 | |
| 205 | void |
| 206 | tui_write (const char *buf, size_t length) |
| 207 | { |
| 208 | WINDOW *w = TUI_CMD_WIN->generic.handle; |
| 209 | |
| 210 | for (size_t i = 0; i < length; i++) |
| 211 | do_tui_putc (w, buf[i]); |
| 212 | update_cmdwin_start_line (); |
| 213 | } |
| 214 | |
| 215 | /* Print a string in the curses command window. The output is |
| 216 | buffered. It is up to the caller to refresh the screen if |
| 217 | necessary. */ |
| 218 | |
| 219 | void |
| 220 | tui_puts (const char *string) |
| 221 | { |
| 222 | WINDOW *w = TUI_CMD_WIN->generic.handle; |
| 223 | char c; |
| 224 | |
| 225 | while ((c = *string++) != 0) |
| 226 | do_tui_putc (w, c); |
| 227 | update_cmdwin_start_line (); |
| 228 | } |
| 229 | |
| 230 | /* Readline callback. |
| 231 | Redisplay the command line with its prompt after readline has |
| 232 | changed the edited text. */ |
| 233 | void |
| 234 | tui_redisplay_readline (void) |
| 235 | { |
| 236 | int prev_col; |
| 237 | int height; |
| 238 | int col; |
| 239 | int c_pos; |
| 240 | int c_line; |
| 241 | int in; |
| 242 | WINDOW *w; |
| 243 | const char *prompt; |
| 244 | int start_line; |
| 245 | |
| 246 | /* Detect when we temporarily left SingleKey and now the readline |
| 247 | edit buffer is empty, automatically restore the SingleKey |
| 248 | mode. The restore must only be done if the command has finished. |
| 249 | The command could call prompt_for_continue and we must not |
| 250 | restore SingleKey so that the prompt and normal keymap are used. */ |
| 251 | if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0 |
| 252 | && !gdb_in_secondary_prompt_p (current_ui)) |
| 253 | tui_set_key_mode (TUI_SINGLE_KEY_MODE); |
| 254 | |
| 255 | if (tui_current_key_mode == TUI_SINGLE_KEY_MODE) |
| 256 | prompt = ""; |
| 257 | else |
| 258 | prompt = tui_rl_saved_prompt; |
| 259 | |
| 260 | c_pos = -1; |
| 261 | c_line = -1; |
| 262 | w = TUI_CMD_WIN->generic.handle; |
| 263 | start_line = TUI_CMD_WIN->detail.command_info.start_line; |
| 264 | wmove (w, start_line, 0); |
| 265 | prev_col = 0; |
| 266 | height = 1; |
| 267 | for (in = 0; prompt && prompt[in]; in++) |
| 268 | { |
| 269 | waddch (w, prompt[in]); |
| 270 | col = getcurx (w); |
| 271 | if (col <= prev_col) |
| 272 | height++; |
| 273 | prev_col = col; |
| 274 | } |
| 275 | for (in = 0; in <= rl_end; in++) |
| 276 | { |
| 277 | unsigned char c; |
| 278 | |
| 279 | if (in == rl_point) |
| 280 | { |
| 281 | getyx (w, c_line, c_pos); |
| 282 | } |
| 283 | |
| 284 | if (in == rl_end) |
| 285 | break; |
| 286 | |
| 287 | c = (unsigned char) rl_line_buffer[in]; |
| 288 | if (CTRL_CHAR (c) || c == RUBOUT) |
| 289 | { |
| 290 | waddch (w, '^'); |
| 291 | waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?'); |
| 292 | } |
| 293 | else if (c == '\t') |
| 294 | { |
| 295 | /* Expand TABs, since ncurses on MS-Windows doesn't. */ |
| 296 | col = getcurx (w); |
| 297 | do |
| 298 | { |
| 299 | waddch (w, ' '); |
| 300 | col++; |
| 301 | } while ((col % 8) != 0); |
| 302 | } |
| 303 | else |
| 304 | { |
| 305 | waddch (w, c); |
| 306 | } |
| 307 | if (c == '\n') |
| 308 | TUI_CMD_WIN->detail.command_info.start_line = getcury (w); |
| 309 | col = getcurx (w); |
| 310 | if (col < prev_col) |
| 311 | height++; |
| 312 | prev_col = col; |
| 313 | } |
| 314 | wclrtobot (w); |
| 315 | TUI_CMD_WIN->detail.command_info.start_line = getcury (w); |
| 316 | if (c_line >= 0) |
| 317 | wmove (w, c_line, c_pos); |
| 318 | TUI_CMD_WIN->detail.command_info.start_line -= height - 1; |
| 319 | |
| 320 | wrefresh (w); |
| 321 | fflush(stdout); |
| 322 | } |
| 323 | |
| 324 | /* Readline callback to prepare the terminal. It is called once each |
| 325 | time we enter readline. Terminal is already setup in curses |
| 326 | mode. */ |
| 327 | static void |
| 328 | tui_prep_terminal (int notused1) |
| 329 | { |
| 330 | /* Save the prompt registered in readline to correctly display it. |
| 331 | (we can't use gdb_prompt() due to secondary prompts and can't use |
| 332 | rl_prompt because it points to an alloca buffer). */ |
| 333 | xfree (tui_rl_saved_prompt); |
| 334 | tui_rl_saved_prompt = rl_prompt != NULL ? xstrdup (rl_prompt) : NULL; |
| 335 | } |
| 336 | |
| 337 | /* Readline callback to restore the terminal. It is called once each |
| 338 | time we leave readline. There is nothing to do in curses mode. */ |
| 339 | static void |
| 340 | tui_deprep_terminal (void) |
| 341 | { |
| 342 | } |
| 343 | |
| 344 | #ifdef TUI_USE_PIPE_FOR_READLINE |
| 345 | /* Read readline output pipe and feed the command window with it. |
| 346 | Should be removed when readline is clean. */ |
| 347 | static void |
| 348 | tui_readline_output (int error, gdb_client_data data) |
| 349 | { |
| 350 | int size; |
| 351 | char buf[256]; |
| 352 | |
| 353 | size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1); |
| 354 | if (size > 0 && tui_active) |
| 355 | { |
| 356 | buf[size] = 0; |
| 357 | tui_puts (buf); |
| 358 | } |
| 359 | } |
| 360 | #endif |
| 361 | |
| 362 | /* TUI version of displayer.crlf. */ |
| 363 | |
| 364 | static void |
| 365 | tui_mld_crlf (const struct match_list_displayer *displayer) |
| 366 | { |
| 367 | tui_putc ('\n'); |
| 368 | } |
| 369 | |
| 370 | /* TUI version of displayer.putch. */ |
| 371 | |
| 372 | static void |
| 373 | tui_mld_putch (const struct match_list_displayer *displayer, int ch) |
| 374 | { |
| 375 | tui_putc (ch); |
| 376 | } |
| 377 | |
| 378 | /* TUI version of displayer.puts. */ |
| 379 | |
| 380 | static void |
| 381 | tui_mld_puts (const struct match_list_displayer *displayer, const char *s) |
| 382 | { |
| 383 | tui_puts (s); |
| 384 | } |
| 385 | |
| 386 | /* TUI version of displayer.flush. */ |
| 387 | |
| 388 | static void |
| 389 | tui_mld_flush (const struct match_list_displayer *displayer) |
| 390 | { |
| 391 | wrefresh (TUI_CMD_WIN->generic.handle); |
| 392 | } |
| 393 | |
| 394 | /* TUI version of displayer.erase_entire_line. */ |
| 395 | |
| 396 | static void |
| 397 | tui_mld_erase_entire_line (const struct match_list_displayer *displayer) |
| 398 | { |
| 399 | WINDOW *w = TUI_CMD_WIN->generic.handle; |
| 400 | int cur_y = getcury (w); |
| 401 | |
| 402 | wmove (w, cur_y, 0); |
| 403 | wclrtoeol (w); |
| 404 | wmove (w, cur_y, 0); |
| 405 | } |
| 406 | |
| 407 | /* TUI version of displayer.beep. */ |
| 408 | |
| 409 | static void |
| 410 | tui_mld_beep (const struct match_list_displayer *displayer) |
| 411 | { |
| 412 | beep (); |
| 413 | } |
| 414 | |
| 415 | /* Helper function for tui_mld_read_key. |
| 416 | This temporarily replaces tui_getc for use during tab-completion |
| 417 | match list display. */ |
| 418 | |
| 419 | static int |
| 420 | tui_mld_getc (FILE *fp) |
| 421 | { |
| 422 | WINDOW *w = TUI_CMD_WIN->generic.handle; |
| 423 | int c = wgetch (w); |
| 424 | |
| 425 | return c; |
| 426 | } |
| 427 | |
| 428 | /* TUI version of displayer.read_key. */ |
| 429 | |
| 430 | static int |
| 431 | tui_mld_read_key (const struct match_list_displayer *displayer) |
| 432 | { |
| 433 | rl_getc_func_t *prev = rl_getc_function; |
| 434 | int c; |
| 435 | |
| 436 | /* We can't use tui_getc as we need NEWLINE to not get emitted. */ |
| 437 | rl_getc_function = tui_mld_getc; |
| 438 | c = rl_read_key (); |
| 439 | rl_getc_function = prev; |
| 440 | return c; |
| 441 | } |
| 442 | |
| 443 | /* TUI version of rl_completion_display_matches_hook. |
| 444 | See gdb_display_match_list for a description of the arguments. */ |
| 445 | |
| 446 | static void |
| 447 | tui_rl_display_match_list (char **matches, int len, int max) |
| 448 | { |
| 449 | struct match_list_displayer displayer; |
| 450 | |
| 451 | rl_get_screen_size (&displayer.height, &displayer.width); |
| 452 | displayer.crlf = tui_mld_crlf; |
| 453 | displayer.putch = tui_mld_putch; |
| 454 | displayer.puts = tui_mld_puts; |
| 455 | displayer.flush = tui_mld_flush; |
| 456 | displayer.erase_entire_line = tui_mld_erase_entire_line; |
| 457 | displayer.beep = tui_mld_beep; |
| 458 | displayer.read_key = tui_mld_read_key; |
| 459 | |
| 460 | gdb_display_match_list (matches, len, max, &displayer); |
| 461 | } |
| 462 | |
| 463 | /* Setup the IO for curses or non-curses mode. |
| 464 | - In non-curses mode, readline and gdb use the standard input and |
| 465 | standard output/error directly. |
| 466 | - In curses mode, the standard output/error is controlled by TUI |
| 467 | with the tui_stdout and tui_stderr. The output is redirected in |
| 468 | the curses command window. Several readline callbacks are installed |
| 469 | so that readline asks for its input to the curses command window |
| 470 | with wgetch(). */ |
| 471 | void |
| 472 | tui_setup_io (int mode) |
| 473 | { |
| 474 | extern int _rl_echoing_p; |
| 475 | |
| 476 | if (mode) |
| 477 | { |
| 478 | /* Redirect readline to TUI. */ |
| 479 | tui_old_rl_redisplay_function = rl_redisplay_function; |
| 480 | tui_old_rl_deprep_terminal = rl_deprep_term_function; |
| 481 | tui_old_rl_prep_terminal = rl_prep_term_function; |
| 482 | tui_old_rl_getc_function = rl_getc_function; |
| 483 | tui_old_rl_display_matches_hook = rl_completion_display_matches_hook; |
| 484 | tui_old_rl_outstream = rl_outstream; |
| 485 | tui_old_rl_echoing_p = _rl_echoing_p; |
| 486 | rl_redisplay_function = tui_redisplay_readline; |
| 487 | rl_deprep_term_function = tui_deprep_terminal; |
| 488 | rl_prep_term_function = tui_prep_terminal; |
| 489 | rl_getc_function = tui_getc; |
| 490 | _rl_echoing_p = 0; |
| 491 | rl_outstream = tui_rl_outstream; |
| 492 | rl_prompt = 0; |
| 493 | rl_completion_display_matches_hook = tui_rl_display_match_list; |
| 494 | rl_already_prompted = 0; |
| 495 | |
| 496 | /* Keep track of previous gdb output. */ |
| 497 | tui_old_stdout = gdb_stdout; |
| 498 | tui_old_stderr = gdb_stderr; |
| 499 | tui_old_uiout = dynamic_cast<cli_ui_out *> (current_uiout); |
| 500 | gdb_assert (tui_old_uiout != nullptr); |
| 501 | |
| 502 | /* Reconfigure gdb output. */ |
| 503 | gdb_stdout = tui_stdout; |
| 504 | gdb_stderr = tui_stderr; |
| 505 | gdb_stdlog = gdb_stdout; /* for moment */ |
| 506 | gdb_stdtarg = gdb_stderr; /* for moment */ |
| 507 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
| 508 | current_uiout = tui_out; |
| 509 | |
| 510 | /* Save tty for SIGCONT. */ |
| 511 | savetty (); |
| 512 | } |
| 513 | else |
| 514 | { |
| 515 | /* Restore gdb output. */ |
| 516 | gdb_stdout = tui_old_stdout; |
| 517 | gdb_stderr = tui_old_stderr; |
| 518 | gdb_stdlog = gdb_stdout; /* for moment */ |
| 519 | gdb_stdtarg = gdb_stderr; /* for moment */ |
| 520 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
| 521 | current_uiout = tui_old_uiout; |
| 522 | |
| 523 | /* Restore readline. */ |
| 524 | rl_redisplay_function = tui_old_rl_redisplay_function; |
| 525 | rl_deprep_term_function = tui_old_rl_deprep_terminal; |
| 526 | rl_prep_term_function = tui_old_rl_prep_terminal; |
| 527 | rl_getc_function = tui_old_rl_getc_function; |
| 528 | rl_completion_display_matches_hook = tui_old_rl_display_matches_hook; |
| 529 | rl_outstream = tui_old_rl_outstream; |
| 530 | _rl_echoing_p = tui_old_rl_echoing_p; |
| 531 | rl_already_prompted = 0; |
| 532 | |
| 533 | /* Save tty for SIGCONT. */ |
| 534 | savetty (); |
| 535 | } |
| 536 | } |
| 537 | |
| 538 | #ifdef SIGCONT |
| 539 | /* Catch SIGCONT to restore the terminal and refresh the screen. */ |
| 540 | static void |
| 541 | tui_cont_sig (int sig) |
| 542 | { |
| 543 | if (tui_active) |
| 544 | { |
| 545 | /* Restore the terminal setting because another process (shell) |
| 546 | might have changed it. */ |
| 547 | resetty (); |
| 548 | |
| 549 | /* Force a refresh of the screen. */ |
| 550 | tui_refresh_all_win (); |
| 551 | |
| 552 | wrefresh (TUI_CMD_WIN->generic.handle); |
| 553 | } |
| 554 | signal (sig, tui_cont_sig); |
| 555 | } |
| 556 | #endif |
| 557 | |
| 558 | /* Initialize the IO for gdb in curses mode. */ |
| 559 | void |
| 560 | tui_initialize_io (void) |
| 561 | { |
| 562 | #ifdef SIGCONT |
| 563 | signal (SIGCONT, tui_cont_sig); |
| 564 | #endif |
| 565 | |
| 566 | /* Create tui output streams. */ |
| 567 | tui_stdout = new tui_file (stdout); |
| 568 | tui_stderr = new tui_file (stderr); |
| 569 | tui_out = tui_out_new (tui_stdout); |
| 570 | |
| 571 | /* Create the default UI. */ |
| 572 | tui_old_uiout = cli_out_new (gdb_stdout); |
| 573 | |
| 574 | #ifdef TUI_USE_PIPE_FOR_READLINE |
| 575 | /* Temporary solution for readline writing to stdout: redirect |
| 576 | readline output in a pipe, read that pipe and output the content |
| 577 | in the curses command window. */ |
| 578 | if (gdb_pipe_cloexec (tui_readline_pipe) != 0) |
| 579 | error (_("Cannot create pipe for readline")); |
| 580 | |
| 581 | tui_rl_outstream = fdopen (tui_readline_pipe[1], "w"); |
| 582 | if (tui_rl_outstream == 0) |
| 583 | error (_("Cannot redirect readline output")); |
| 584 | |
| 585 | setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0); |
| 586 | |
| 587 | #ifdef O_NONBLOCK |
| 588 | (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK); |
| 589 | #else |
| 590 | #ifdef O_NDELAY |
| 591 | (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY); |
| 592 | #endif |
| 593 | #endif |
| 594 | add_file_handler (tui_readline_pipe[0], tui_readline_output, 0); |
| 595 | #else |
| 596 | tui_rl_outstream = stdout; |
| 597 | #endif |
| 598 | } |
| 599 | |
| 600 | /* Get a character from the command window. This is called from the |
| 601 | readline package. */ |
| 602 | int |
| 603 | tui_getc (FILE *fp) |
| 604 | { |
| 605 | int ch; |
| 606 | WINDOW *w; |
| 607 | |
| 608 | w = TUI_CMD_WIN->generic.handle; |
| 609 | |
| 610 | #ifdef TUI_USE_PIPE_FOR_READLINE |
| 611 | /* Flush readline output. */ |
| 612 | tui_readline_output (0, 0); |
| 613 | #endif |
| 614 | |
| 615 | ch = wgetch (w); |
| 616 | |
| 617 | /* The \n must be echoed because it will not be printed by |
| 618 | readline. */ |
| 619 | if (ch == '\n') |
| 620 | { |
| 621 | /* When hitting return with an empty input, gdb executes the last |
| 622 | command. If we emit a newline, this fills up the command window |
| 623 | with empty lines with gdb prompt at beginning. Instead of that, |
| 624 | stay on the same line but provide a visual effect to show the |
| 625 | user we recognized the command. */ |
| 626 | if (rl_end == 0 && !gdb_in_secondary_prompt_p (current_ui)) |
| 627 | { |
| 628 | wmove (w, getcury (w), 0); |
| 629 | |
| 630 | /* Clear the line. This will blink the gdb prompt since |
| 631 | it will be redrawn at the same line. */ |
| 632 | wclrtoeol (w); |
| 633 | wrefresh (w); |
| 634 | napms (20); |
| 635 | } |
| 636 | else |
| 637 | { |
| 638 | /* Move cursor to the end of the command line before emitting the |
| 639 | newline. We need to do so because when ncurses outputs a newline |
| 640 | it truncates any text that appears past the end of the cursor. */ |
| 641 | int px, py; |
| 642 | getyx (w, py, px); |
| 643 | px += rl_end - rl_point; |
| 644 | py += px / TUI_CMD_WIN->generic.width; |
| 645 | px %= TUI_CMD_WIN->generic.width; |
| 646 | wmove (w, py, px); |
| 647 | tui_putc ('\n'); |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | /* Handle prev/next/up/down here. */ |
| 652 | ch = tui_dispatch_ctrl_char (ch); |
| 653 | |
| 654 | if (ch == KEY_BACKSPACE) |
| 655 | return '\b'; |
| 656 | |
| 657 | if (current_ui->command_editing && key_is_start_sequence (ch)) |
| 658 | { |
| 659 | int ch_pending; |
| 660 | |
| 661 | nodelay (w, TRUE); |
| 662 | ch_pending = wgetch (w); |
| 663 | nodelay (w, FALSE); |
| 664 | |
| 665 | /* If we have pending input following a start sequence, call the stdin |
| 666 | event handler again because ncurses may have already read and stored |
| 667 | the input into its internal buffer, meaning that we won't get an stdin |
| 668 | event for it. If we don't compensate for this missed stdin event, key |
| 669 | sequences as Alt_F (^[f) will not behave promptly. |
| 670 | |
| 671 | (We only compensates for the missed 2nd byte of a key sequence because |
| 672 | 2-byte sequences are by far the most commonly used. ncurses may have |
| 673 | buffered a larger, 3+-byte key sequence though it remains to be seen |
| 674 | whether it is useful to compensate for all the bytes of such |
| 675 | sequences.) */ |
| 676 | if (ch_pending != ERR) |
| 677 | { |
| 678 | ungetch (ch_pending); |
| 679 | call_stdin_event_handler_again_p = 1; |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | return ch; |
| 684 | } |
| 685 | |
| 686 | /* Utility function to expand TABs in a STRING into spaces. STRING |
| 687 | will be displayed starting at column COL, and is assumed to include |
| 688 | no newlines. The returned expanded string is malloc'ed. */ |
| 689 | |
| 690 | char * |
| 691 | tui_expand_tabs (const char *string, int col) |
| 692 | { |
| 693 | int n_adjust, ncol; |
| 694 | const char *s; |
| 695 | char *ret, *q; |
| 696 | |
| 697 | /* 1. How many additional characters do we need? */ |
| 698 | for (ncol = col, n_adjust = 0, s = string; s; ) |
| 699 | { |
| 700 | s = strpbrk (s, "\t"); |
| 701 | if (s) |
| 702 | { |
| 703 | ncol += (s - string) + n_adjust; |
| 704 | /* Adjustment for the next tab stop, minus one for the TAB |
| 705 | we replace with spaces. */ |
| 706 | n_adjust += 8 - (ncol % 8) - 1; |
| 707 | s++; |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | /* Allocate the copy. */ |
| 712 | ret = q = (char *) xmalloc (strlen (string) + n_adjust + 1); |
| 713 | |
| 714 | /* 2. Copy the original string while replacing TABs with spaces. */ |
| 715 | for (ncol = col, s = string; s; ) |
| 716 | { |
| 717 | const char *s1 = strpbrk (s, "\t"); |
| 718 | if (s1) |
| 719 | { |
| 720 | if (s1 > s) |
| 721 | { |
| 722 | strncpy (q, s, s1 - s); |
| 723 | q += s1 - s; |
| 724 | ncol += s1 - s; |
| 725 | } |
| 726 | do { |
| 727 | *q++ = ' '; |
| 728 | ncol++; |
| 729 | } while ((ncol % 8) != 0); |
| 730 | s1++; |
| 731 | } |
| 732 | else |
| 733 | strcpy (q, s); |
| 734 | s = s1; |
| 735 | } |
| 736 | |
| 737 | return ret; |
| 738 | } |