gdb/tui/tui-io.c

   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 }