| 1 | /* TUI support I/O functions. |
| 2 | |
| 3 | Copyright (C) 1998-2014 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 | #include "filestuff.h" |
| 41 | |
| 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 | int |
| 68 | key_is_command_char (int ch) |
| 69 | { |
| 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) |
| 74 | || (ch == (int)'\f') |
| 75 | || key_is_start_sequence (ch)); |
| 76 | } |
| 77 | |
| 78 | /* Use definition from readline 4.3. */ |
| 79 | #undef CTRL_CHAR |
| 80 | #define CTRL_CHAR(c) \ |
| 81 | ((c) < control_character_threshold && (((c) & 0x80) == 0)) |
| 82 | |
| 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 |
| 85 | mode. |
| 86 | |
| 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). |
| 94 | |
| 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() |
| 97 | function with stdin. |
| 98 | |
| 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. |
| 108 | |
| 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. */ |
| 114 | |
| 115 | /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */ |
| 116 | #ifdef HAVE_PIPE |
| 117 | #define TUI_USE_PIPE_FOR_READLINE |
| 118 | #endif |
| 119 | /* #undef TUI_USE_PIPE_FOR_READLINE */ |
| 120 | |
| 121 | /* TUI output files. */ |
| 122 | static struct ui_file *tui_stdout; |
| 123 | static struct ui_file *tui_stderr; |
| 124 | struct ui_out *tui_out; |
| 125 | |
| 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; |
| 130 | |
| 131 | /* Readline previous hooks. */ |
| 132 | static rl_getc_func_t *tui_old_rl_getc_function; |
| 133 | static rl_voidfunc_t *tui_old_rl_redisplay_function; |
| 134 | static rl_vintfunc_t *tui_old_rl_prep_terminal; |
| 135 | static rl_voidfunc_t *tui_old_rl_deprep_terminal; |
| 136 | static int tui_old_rl_echoing_p; |
| 137 | |
| 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]; |
| 144 | #endif |
| 145 | |
| 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; |
| 149 | |
| 150 | static unsigned int tui_handle_resize_during_io (unsigned int); |
| 151 | |
| 152 | static void |
| 153 | tui_putc (char c) |
| 154 | { |
| 155 | char buf[2]; |
| 156 | |
| 157 | buf[0] = c; |
| 158 | buf[1] = 0; |
| 159 | tui_puts (buf); |
| 160 | } |
| 161 | |
| 162 | /* Print the string in the curses command window. */ |
| 163 | void |
| 164 | tui_puts (const char *string) |
| 165 | { |
| 166 | static int tui_skip_line = -1; |
| 167 | char c; |
| 168 | WINDOW *w; |
| 169 | |
| 170 | w = TUI_CMD_WIN->generic.handle; |
| 171 | while ((c = *string++) != 0) |
| 172 | { |
| 173 | /* Catch annotation and discard them. We need two \032 and |
| 174 | discard until a \n is seen. */ |
| 175 | if (c == '\032') |
| 176 | { |
| 177 | tui_skip_line++; |
| 178 | } |
| 179 | else if (tui_skip_line != 1) |
| 180 | { |
| 181 | tui_skip_line = -1; |
| 182 | waddch (w, c); |
| 183 | } |
| 184 | else if (c == '\n') |
| 185 | tui_skip_line = -1; |
| 186 | } |
| 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; |
| 191 | |
| 192 | /* We could defer the following. */ |
| 193 | wrefresh (w); |
| 194 | fflush (stdout); |
| 195 | } |
| 196 | |
| 197 | /* Readline callback. |
| 198 | Redisplay the command line with its prompt after readline has |
| 199 | changed the edited text. */ |
| 200 | void |
| 201 | tui_redisplay_readline (void) |
| 202 | { |
| 203 | int prev_col; |
| 204 | int height; |
| 205 | int col, line; |
| 206 | int c_pos; |
| 207 | int c_line; |
| 208 | int in; |
| 209 | WINDOW *w; |
| 210 | char *prompt; |
| 211 | int start_line; |
| 212 | |
| 213 | /* Detect when we temporarily left SingleKey and now the readline |
| 214 | edit buffer is empty, automatically restore the SingleKey |
| 215 | mode. The restore must only be done if the command has finished. |
| 216 | The command could call prompt_for_continue and we must not |
| 217 | restore SingleKey so that the prompt and normal keymap are used. */ |
| 218 | if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0 |
| 219 | && immediate_quit == 0) |
| 220 | tui_set_key_mode (TUI_SINGLE_KEY_MODE); |
| 221 | |
| 222 | if (tui_current_key_mode == TUI_SINGLE_KEY_MODE) |
| 223 | prompt = ""; |
| 224 | else |
| 225 | prompt = tui_rl_saved_prompt; |
| 226 | |
| 227 | c_pos = -1; |
| 228 | c_line = -1; |
| 229 | w = TUI_CMD_WIN->generic.handle; |
| 230 | start_line = TUI_CMD_WIN->detail.command_info.start_line; |
| 231 | wmove (w, start_line, 0); |
| 232 | prev_col = 0; |
| 233 | height = 1; |
| 234 | for (in = 0; prompt && prompt[in]; in++) |
| 235 | { |
| 236 | waddch (w, prompt[in]); |
| 237 | getyx (w, line, col); |
| 238 | if (col < prev_col) |
| 239 | height++; |
| 240 | prev_col = col; |
| 241 | } |
| 242 | for (in = 0; in < rl_end; in++) |
| 243 | { |
| 244 | unsigned char c; |
| 245 | |
| 246 | c = (unsigned char) rl_line_buffer[in]; |
| 247 | if (in == rl_point) |
| 248 | { |
| 249 | getyx (w, c_line, c_pos); |
| 250 | } |
| 251 | |
| 252 | if (CTRL_CHAR (c) || c == RUBOUT) |
| 253 | { |
| 254 | waddch (w, '^'); |
| 255 | waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?'); |
| 256 | } |
| 257 | else |
| 258 | { |
| 259 | waddch (w, c); |
| 260 | } |
| 261 | if (c == '\n') |
| 262 | { |
| 263 | getyx (w, TUI_CMD_WIN->detail.command_info.start_line, |
| 264 | TUI_CMD_WIN->detail.command_info.curch); |
| 265 | } |
| 266 | getyx (w, line, col); |
| 267 | if (col < prev_col) |
| 268 | height++; |
| 269 | prev_col = col; |
| 270 | } |
| 271 | wclrtobot (w); |
| 272 | getyx (w, TUI_CMD_WIN->detail.command_info.start_line, |
| 273 | TUI_CMD_WIN->detail.command_info.curch); |
| 274 | if (c_line >= 0) |
| 275 | { |
| 276 | wmove (w, c_line, c_pos); |
| 277 | TUI_CMD_WIN->detail.command_info.cur_line = c_line; |
| 278 | TUI_CMD_WIN->detail.command_info.curch = c_pos; |
| 279 | } |
| 280 | TUI_CMD_WIN->detail.command_info.start_line -= height - 1; |
| 281 | |
| 282 | wrefresh (w); |
| 283 | fflush(stdout); |
| 284 | } |
| 285 | |
| 286 | /* Readline callback to prepare the terminal. It is called once each |
| 287 | time we enter readline. Terminal is already setup in curses |
| 288 | mode. */ |
| 289 | static void |
| 290 | tui_prep_terminal (int notused1) |
| 291 | { |
| 292 | /* Save the prompt registered in readline to correctly display it. |
| 293 | (we can't use gdb_prompt() due to secondary prompts and can't use |
| 294 | rl_prompt because it points to an alloca buffer). */ |
| 295 | xfree (tui_rl_saved_prompt); |
| 296 | tui_rl_saved_prompt = xstrdup (rl_prompt); |
| 297 | } |
| 298 | |
| 299 | /* Readline callback to restore the terminal. It is called once each |
| 300 | time we leave readline. There is nothing to do in curses mode. */ |
| 301 | static void |
| 302 | tui_deprep_terminal (void) |
| 303 | { |
| 304 | } |
| 305 | |
| 306 | #ifdef TUI_USE_PIPE_FOR_READLINE |
| 307 | /* Read readline output pipe and feed the command window with it. |
| 308 | Should be removed when readline is clean. */ |
| 309 | static void |
| 310 | tui_readline_output (int error, gdb_client_data data) |
| 311 | { |
| 312 | int size; |
| 313 | char buf[256]; |
| 314 | |
| 315 | size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1); |
| 316 | if (size > 0 && tui_active) |
| 317 | { |
| 318 | buf[size] = 0; |
| 319 | tui_puts (buf); |
| 320 | } |
| 321 | } |
| 322 | #endif |
| 323 | |
| 324 | /* Return the portion of PATHNAME that should be output when listing |
| 325 | possible completions. If we are hacking filename completion, we |
| 326 | are only interested in the basename, the portion following the |
| 327 | final slash. Otherwise, we return what we were passed. |
| 328 | |
| 329 | Comes from readline/complete.c. */ |
| 330 | static const char * |
| 331 | printable_part (const char *pathname) |
| 332 | { |
| 333 | return rl_filename_completion_desired ? lbasename (pathname) : pathname; |
| 334 | } |
| 335 | |
| 336 | /* Output TO_PRINT to rl_outstream. If VISIBLE_STATS is defined and |
| 337 | we are using it, check for and output a single character for |
| 338 | `special' filenames. Return the number of characters we |
| 339 | output. */ |
| 340 | |
| 341 | #define PUTX(c) \ |
| 342 | do { \ |
| 343 | if (CTRL_CHAR (c)) \ |
| 344 | { \ |
| 345 | tui_puts ("^"); \ |
| 346 | tui_putc (UNCTRL (c)); \ |
| 347 | printed_len += 2; \ |
| 348 | } \ |
| 349 | else if (c == RUBOUT) \ |
| 350 | { \ |
| 351 | tui_puts ("^?"); \ |
| 352 | printed_len += 2; \ |
| 353 | } \ |
| 354 | else \ |
| 355 | { \ |
| 356 | tui_putc (c); \ |
| 357 | printed_len++; \ |
| 358 | } \ |
| 359 | } while (0) |
| 360 | |
| 361 | static int |
| 362 | print_filename (const char *to_print, const char *full_pathname) |
| 363 | { |
| 364 | int printed_len = 0; |
| 365 | const char *s; |
| 366 | |
| 367 | for (s = to_print; *s; s++) |
| 368 | { |
| 369 | PUTX (*s); |
| 370 | } |
| 371 | return printed_len; |
| 372 | } |
| 373 | |
| 374 | /* The user must press "y" or "n". Non-zero return means "y" pressed. |
| 375 | Comes from readline/complete.c. */ |
| 376 | static int |
| 377 | get_y_or_n (void) |
| 378 | { |
| 379 | extern int _rl_abort_internal (); |
| 380 | int c; |
| 381 | |
| 382 | for (;;) |
| 383 | { |
| 384 | c = rl_read_key (); |
| 385 | if (c == 'y' || c == 'Y' || c == ' ') |
| 386 | return (1); |
| 387 | if (c == 'n' || c == 'N' || c == RUBOUT) |
| 388 | return (0); |
| 389 | if (c == ABORT_CHAR) |
| 390 | _rl_abort_internal (); |
| 391 | beep (); |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* A convenience function for displaying a list of strings in |
| 396 | columnar format on readline's output stream. MATCHES is the list |
| 397 | of strings, in argv format, LEN is the number of strings in MATCHES, |
| 398 | and MAX is the length of the longest string in MATCHES. |
| 399 | |
| 400 | Comes from readline/complete.c and modified to write in |
| 401 | the TUI command window using tui_putc/tui_puts. */ |
| 402 | static void |
| 403 | tui_rl_display_match_list (char **matches, int len, int max) |
| 404 | { |
| 405 | typedef int QSFUNC (const void *, const void *); |
| 406 | extern int _rl_qsort_string_compare (const void *, |
| 407 | const void *); |
| 408 | extern int _rl_print_completions_horizontally; |
| 409 | |
| 410 | int count, limit, printed_len; |
| 411 | int i, j, k, l; |
| 412 | const char *temp; |
| 413 | |
| 414 | /* Screen dimension correspond to the TUI command window. */ |
| 415 | int screenwidth = TUI_CMD_WIN->generic.width; |
| 416 | |
| 417 | /* If there are many items, then ask the user if she really wants to |
| 418 | see them all. */ |
| 419 | if (len >= rl_completion_query_items) |
| 420 | { |
| 421 | char msg[256]; |
| 422 | |
| 423 | xsnprintf (msg, sizeof (msg), |
| 424 | "\nDisplay all %d possibilities? (y or n)", len); |
| 425 | tui_puts (msg); |
| 426 | if (get_y_or_n () == 0) |
| 427 | { |
| 428 | tui_puts ("\n"); |
| 429 | return; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | /* How many items of MAX length can we fit in the screen window? */ |
| 434 | max += 2; |
| 435 | limit = screenwidth / max; |
| 436 | if (limit != 1 && (limit * max == screenwidth)) |
| 437 | limit--; |
| 438 | |
| 439 | /* Avoid a possible floating exception. If max > screenwidth, limit |
| 440 | will be 0 and a divide-by-zero fault will result. */ |
| 441 | if (limit == 0) |
| 442 | limit = 1; |
| 443 | |
| 444 | /* How many iterations of the printing loop? */ |
| 445 | count = (len + (limit - 1)) / limit; |
| 446 | |
| 447 | /* Watch out for special case. If LEN is less than LIMIT, then |
| 448 | just do the inner printing loop. |
| 449 | 0 < len <= limit implies count = 1. */ |
| 450 | |
| 451 | /* Sort the items if they are not already sorted. */ |
| 452 | if (rl_ignore_completion_duplicates == 0) |
| 453 | qsort (matches + 1, len, sizeof (char *), |
| 454 | (QSFUNC *)_rl_qsort_string_compare); |
| 455 | |
| 456 | tui_putc ('\n'); |
| 457 | |
| 458 | if (_rl_print_completions_horizontally == 0) |
| 459 | { |
| 460 | /* Print the sorted items, up-and-down alphabetically, like ls. */ |
| 461 | for (i = 1; i <= count; i++) |
| 462 | { |
| 463 | for (j = 0, l = i; j < limit; j++) |
| 464 | { |
| 465 | if (l > len || matches[l] == 0) |
| 466 | break; |
| 467 | else |
| 468 | { |
| 469 | temp = printable_part (matches[l]); |
| 470 | printed_len = print_filename (temp, matches[l]); |
| 471 | |
| 472 | if (j + 1 < limit) |
| 473 | for (k = 0; k < max - printed_len; k++) |
| 474 | tui_putc (' '); |
| 475 | } |
| 476 | l += count; |
| 477 | } |
| 478 | tui_putc ('\n'); |
| 479 | } |
| 480 | } |
| 481 | else |
| 482 | { |
| 483 | /* Print the sorted items, across alphabetically, like ls -x. */ |
| 484 | for (i = 1; matches[i]; i++) |
| 485 | { |
| 486 | temp = printable_part (matches[i]); |
| 487 | printed_len = print_filename (temp, matches[i]); |
| 488 | /* Have we reached the end of this line? */ |
| 489 | if (matches[i+1]) |
| 490 | { |
| 491 | if (i && (limit > 1) && (i % limit) == 0) |
| 492 | tui_putc ('\n'); |
| 493 | else |
| 494 | for (k = 0; k < max - printed_len; k++) |
| 495 | tui_putc (' '); |
| 496 | } |
| 497 | } |
| 498 | tui_putc ('\n'); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | /* Setup the IO for curses or non-curses mode. |
| 503 | - In non-curses mode, readline and gdb use the standard input and |
| 504 | standard output/error directly. |
| 505 | - In curses mode, the standard output/error is controlled by TUI |
| 506 | with the tui_stdout and tui_stderr. The output is redirected in |
| 507 | the curses command window. Several readline callbacks are installed |
| 508 | so that readline asks for its input to the curses command window |
| 509 | with wgetch(). */ |
| 510 | void |
| 511 | tui_setup_io (int mode) |
| 512 | { |
| 513 | extern int _rl_echoing_p; |
| 514 | |
| 515 | if (mode) |
| 516 | { |
| 517 | /* Redirect readline to TUI. */ |
| 518 | tui_old_rl_redisplay_function = rl_redisplay_function; |
| 519 | tui_old_rl_deprep_terminal = rl_deprep_term_function; |
| 520 | tui_old_rl_prep_terminal = rl_prep_term_function; |
| 521 | tui_old_rl_getc_function = rl_getc_function; |
| 522 | tui_old_rl_outstream = rl_outstream; |
| 523 | tui_old_rl_echoing_p = _rl_echoing_p; |
| 524 | rl_redisplay_function = tui_redisplay_readline; |
| 525 | rl_deprep_term_function = tui_deprep_terminal; |
| 526 | rl_prep_term_function = tui_prep_terminal; |
| 527 | rl_getc_function = tui_getc; |
| 528 | _rl_echoing_p = 0; |
| 529 | rl_outstream = tui_rl_outstream; |
| 530 | rl_prompt = 0; |
| 531 | rl_completion_display_matches_hook = tui_rl_display_match_list; |
| 532 | rl_already_prompted = 0; |
| 533 | |
| 534 | /* Keep track of previous gdb output. */ |
| 535 | tui_old_stdout = gdb_stdout; |
| 536 | tui_old_stderr = gdb_stderr; |
| 537 | tui_old_uiout = current_uiout; |
| 538 | |
| 539 | /* Reconfigure gdb output. */ |
| 540 | gdb_stdout = tui_stdout; |
| 541 | gdb_stderr = tui_stderr; |
| 542 | gdb_stdlog = gdb_stdout; /* for moment */ |
| 543 | gdb_stdtarg = gdb_stderr; /* for moment */ |
| 544 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
| 545 | current_uiout = tui_out; |
| 546 | |
| 547 | /* Save tty for SIGCONT. */ |
| 548 | savetty (); |
| 549 | } |
| 550 | else |
| 551 | { |
| 552 | /* Restore gdb output. */ |
| 553 | gdb_stdout = tui_old_stdout; |
| 554 | gdb_stderr = tui_old_stderr; |
| 555 | gdb_stdlog = gdb_stdout; /* for moment */ |
| 556 | gdb_stdtarg = gdb_stderr; /* for moment */ |
| 557 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
| 558 | current_uiout = tui_old_uiout; |
| 559 | |
| 560 | /* Restore readline. */ |
| 561 | rl_redisplay_function = tui_old_rl_redisplay_function; |
| 562 | rl_deprep_term_function = tui_old_rl_deprep_terminal; |
| 563 | rl_prep_term_function = tui_old_rl_prep_terminal; |
| 564 | rl_getc_function = tui_old_rl_getc_function; |
| 565 | rl_outstream = tui_old_rl_outstream; |
| 566 | rl_completion_display_matches_hook = 0; |
| 567 | _rl_echoing_p = tui_old_rl_echoing_p; |
| 568 | rl_already_prompted = 0; |
| 569 | |
| 570 | /* Save tty for SIGCONT. */ |
| 571 | savetty (); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | #ifdef SIGCONT |
| 576 | /* Catch SIGCONT to restore the terminal and refresh the screen. */ |
| 577 | static void |
| 578 | tui_cont_sig (int sig) |
| 579 | { |
| 580 | if (tui_active) |
| 581 | { |
| 582 | /* Restore the terminal setting because another process (shell) |
| 583 | might have changed it. */ |
| 584 | resetty (); |
| 585 | |
| 586 | /* Force a refresh of the screen. */ |
| 587 | tui_refresh_all_win (); |
| 588 | |
| 589 | /* Update cursor position on the screen. */ |
| 590 | wmove (TUI_CMD_WIN->generic.handle, |
| 591 | TUI_CMD_WIN->detail.command_info.start_line, |
| 592 | TUI_CMD_WIN->detail.command_info.curch); |
| 593 | wrefresh (TUI_CMD_WIN->generic.handle); |
| 594 | } |
| 595 | signal (sig, tui_cont_sig); |
| 596 | } |
| 597 | #endif |
| 598 | |
| 599 | /* Initialize the IO for gdb in curses mode. */ |
| 600 | void |
| 601 | tui_initialize_io (void) |
| 602 | { |
| 603 | #ifdef SIGCONT |
| 604 | signal (SIGCONT, tui_cont_sig); |
| 605 | #endif |
| 606 | |
| 607 | /* Create tui output streams. */ |
| 608 | tui_stdout = tui_fileopen (stdout); |
| 609 | tui_stderr = tui_fileopen (stderr); |
| 610 | tui_out = tui_out_new (tui_stdout); |
| 611 | |
| 612 | /* Create the default UI. */ |
| 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 (gdb_pipe_cloexec (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 | } |