gdb/tui/tui-io.c

   1 /* TUI support I/O functions.
   2
   3    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Hewlett-Packard Company.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23    Boston, MA 02110-1301, USA.  */
  24
  25 #include "defs.h"
  26 #include "target.h"
  27 #include "event-loop.h"
  28 #include "event-top.h"
  29 #include "command.h"
  30 #include "top.h"
  31 #include "tui/tui.h"
  32 #include "tui/tui-data.h"
  33 #include "tui/tui-io.h"
  34 #include "tui/tui-command.h"
  35 #include "tui/tui-win.h"
  36 #include "tui/tui-wingeneral.h"
  37 #include "tui/tui-file.h"
  38 #include "ui-out.h"
  39 #include "cli-out.h"
  40 #include <fcntl.h>
  41 #include <signal.h>
  42 #include <stdio.h>
  43
  44 #include "gdb_curses.h"
  45
  46 /* This redefines CTRL if it is not already defined, so it must come
  47    after terminal state releated include files like <term.h> and
  48    "gdb_curses.h".  */
  49 #include "readline/readline.h"
  50
  51 int
  52 key_is_start_sequence (int ch)
  53 {
  54   return (ch == 27);
  55 }
  56
  57 int
  58 key_is_end_sequence (int ch)
  59 {
  60   return (ch == 126);
  61 }
  62
  63 int
  64 key_is_backspace (int ch)
  65 {
  66   return (ch == 8);
  67 }
  68
  69 int
  70 key_is_command_char (int ch)
  71 {
  72   return ((ch == KEY_NPAGE) || (ch == KEY_PPAGE)
  73           || (ch == KEY_LEFT) || (ch == KEY_RIGHT)
  74           || (ch == KEY_UP) || (ch == KEY_DOWN)
  75           || (ch == KEY_SF) || (ch == KEY_SR)
  76           || (ch == (int)'\f') || key_is_start_sequence (ch));
  77 }
  78
  79 /* Use definition from readline 4.3.  */
  80 #undef CTRL_CHAR
  81 #define CTRL_CHAR(c) ((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 window.
  88    For this, the gdb_stdout and gdb_stderr are redirected to the specific
  89    ui_file implemented by TUI.  The output is handled by tui_puts().
  90    The input is also controlled by curses with tui_getc().  The readline
  91    library uses this function to get its input.  Several readline hooks
  92    are installed to redirect readline output to the TUI (see also the
  93    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 management of
 100    the output.  Even if we install a redisplay handler, it sometimes writes on
 101    a stdout file.  It is important to redirect every output produced by
 102    readline, otherwise the curses window will be garbled.  This is implemented
 103    with a pipe that TUI reads and readline writes to.  A gdb input handler
 104    is created so that reading the pipe is handled automatically.
 105    This will probably not work on non-Unix platforms.  The best fix is
 106    to make readline clean enougth so that is never write on stdout.
 107
 108    Note SCz/2002-09-01: we now use more readline hooks and it seems that
 109    with them we don't need the pipe anymore (verified by creating the pipe
 110    and closing its end so that write causes a SIGPIPE).  The old pipe code
 111    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 #define TUI_USE_PIPE_FOR_READLINE
 116 /*#undef TUI_USE_PIPE_FOR_READLINE*/
 117
 118 /* TUI output files.  */
 119 static struct ui_file *tui_stdout;
 120 static struct ui_file *tui_stderr;
 121 struct ui_out *tui_out;
 122
 123 /* GDB output files in non-curses mode.  */
 124 static struct ui_file *tui_old_stdout;
 125 static struct ui_file *tui_old_stderr;
 126 struct ui_out *tui_old_uiout;
 127
 128 /* Readline previous hooks.  */
 129 static Function *tui_old_rl_getc_function;
 130 static VFunction *tui_old_rl_redisplay_function;
 131 static VFunction *tui_old_rl_prep_terminal;
 132 static VFunction *tui_old_rl_deprep_terminal;
 133 static int tui_old_readline_echoing_p;
 134
 135 /* Readline output stream.
 136    Should be removed when readline is clean.  */
 137 static FILE *tui_rl_outstream;
 138 static FILE *tui_old_rl_outstream;
 139 #ifdef TUI_USE_PIPE_FOR_READLINE
 140 static int tui_readline_pipe[2];
 141 #endif
 142
 143 /* The last gdb prompt that was registered in readline.
 144    This may be the main gdb prompt or a secondary prompt.  */
 145 static char *tui_rl_saved_prompt;
 146
 147 static unsigned int tui_handle_resize_during_io (unsigned int);
 148
 149 static void
 150 tui_putc (char c)
 151 {
 152   char buf[2];
 153
 154   buf[0] = c;
 155   buf[1] = 0;
 156   tui_puts (buf);
 157 }
 158
 159 /* Print the string in the curses command window.  */
 160 void
 161 tui_puts (const char *string)
 162 {
 163   static int tui_skip_line = -1;
 164   char c;
 165   WINDOW *w;
 166
 167   w = TUI_CMD_WIN->generic.handle;
 168   while ((c = *string++) != 0)
 169     {
 170       /* Catch annotation and discard them.  We need two \032 and
 171          discard until a \n is seen.  */
 172       if (c == '\032')
 173         {
 174           tui_skip_line++;
 175         }
 176       else if (tui_skip_line != 1)
 177         {
 178           tui_skip_line = -1;
 179           waddch (w, c);
 180         }
 181       else if (c == '\n')
 182         tui_skip_line = -1;
 183     }
 184   getyx (w, TUI_CMD_WIN->detail.command_info.cur_line,
 185          TUI_CMD_WIN->detail.command_info.curch);
 186   TUI_CMD_WIN->detail.command_info.start_line = TUI_CMD_WIN->detail.command_info.cur_line;
 187
 188   /* We could defer the following.  */
 189   wrefresh (w);
 190   fflush (stdout);
 191 }
 192
 193 /* Readline callback.
 194    Redisplay the command line with its prompt after readline has
 195    changed the edited text.  */
 196 void
 197 tui_redisplay_readline (void)
 198 {
 199   int prev_col;
 200   int height;
 201   int col, line;
 202   int c_pos;
 203   int c_line;
 204   int in;
 205   WINDOW *w;
 206   char *prompt;
 207   int start_line;
 208
 209   /* Detect when we temporarily left SingleKey and now the readline
 210      edit buffer is empty, automatically restore the SingleKey mode.  */
 211   if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0)
 212     tui_set_key_mode (TUI_SINGLE_KEY_MODE);
 213
 214   if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
 215     prompt = "";
 216   else
 217     prompt = tui_rl_saved_prompt;
 218
 219   c_pos = -1;
 220   c_line = -1;
 221   w = TUI_CMD_WIN->generic.handle;
 222   start_line = TUI_CMD_WIN->detail.command_info.start_line;
 223   wmove (w, start_line, 0);
 224   prev_col = 0;
 225   height = 1;
 226   for (in = 0; prompt && prompt[in]; in++)
 227     {
 228       waddch (w, prompt[in]);
 229       getyx (w, line, col);
 230       if (col < prev_col)
 231         height++;
 232       prev_col = col;
 233     }
 234   for (in = 0; in < rl_end; in++)
 235     {
 236       unsigned char c;
 237
 238       c = (unsigned char) rl_line_buffer[in];
 239       if (in == rl_point)
 240         {
 241           getyx (w, c_line, c_pos);
 242         }
 243
 244       if (CTRL_CHAR (c) || c == RUBOUT)
 245         {
 246           waddch (w, '^');
 247           waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
 248         }
 249       else
 250         {
 251           waddch (w, c);
 252         }
 253       if (c == '\n')
 254         {
 255           getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 256                  TUI_CMD_WIN->detail.command_info.curch);
 257         }
 258       getyx (w, line, col);
 259       if (col < prev_col)
 260         height++;
 261       prev_col = col;
 262     }
 263   wclrtobot (w);
 264   getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 265          TUI_CMD_WIN->detail.command_info.curch);
 266   if (c_line >= 0)
 267     {
 268       wmove (w, c_line, c_pos);
 269       TUI_CMD_WIN->detail.command_info.cur_line = c_line;
 270       TUI_CMD_WIN->detail.command_info.curch = c_pos;
 271     }
 272   TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
 273
 274   wrefresh (w);
 275   fflush(stdout);
 276 }
 277
 278 /* Readline callback to prepare the terminal.  It is called once
 279    each time we enter readline.  Terminal is already setup in curses mode.  */
 280 static void
 281 tui_prep_terminal (int notused1)
 282 {
 283   /* Save the prompt registered in readline to correctly display it.
 284      (we can't use gdb_prompt() due to secondary prompts and can't use
 285      rl_prompt because it points to an alloca buffer).  */
 286   xfree (tui_rl_saved_prompt);
 287   tui_rl_saved_prompt = xstrdup (rl_prompt);
 288 }
 289
 290 /* Readline callback to restore the terminal.  It is called once
 291    each time we leave readline.  There is nothing to do in curses mode.  */
 292 static void
 293 tui_deprep_terminal (void)
 294 {
 295 }
 296
 297 #ifdef TUI_USE_PIPE_FOR_READLINE
 298 /* Read readline output pipe and feed the command window with it.
 299    Should be removed when readline is clean.  */
 300 static void
 301 tui_readline_output (int code, gdb_client_data data)
 302 {
 303   int size;
 304   char buf[256];
 305
 306   size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
 307   if (size > 0 && tui_active)
 308     {
 309       buf[size] = 0;
 310       tui_puts (buf);
 311     }
 312 }
 313 #endif
 314
 315 /* Return the portion of PATHNAME that should be output when listing
 316    possible completions.  If we are hacking filename completion, we
 317    are only interested in the basename, the portion following the
 318    final slash.  Otherwise, we return what we were passed.
 319
 320    Comes from readline/complete.c  */
 321 static char *
 322 printable_part (char *pathname)
 323 {
 324   char *temp;
 325
 326   temp = rl_filename_completion_desired ? strrchr (pathname, '/') : (char *)NULL;
 327 #if defined (__MSDOS__)
 328   if (rl_filename_completion_desired && temp == 0 && isalpha (pathname[0]) && pathname[1] == ':')
 329     temp = pathname + 1;
 330 #endif
 331   return (temp ? ++temp : pathname);
 332 }
 333
 334 /* Output TO_PRINT to rl_outstream.  If VISIBLE_STATS is defined and we
 335    are using it, check for and output a single character for `special'
 336    filenames.  Return the number of characters we output. */
 337
 338 #define PUTX(c) \
 339     do { \
 340       if (CTRL_CHAR (c)) \
 341         { \
 342           tui_puts ("^"); \
 343           tui_putc (UNCTRL (c)); \
 344           printed_len += 2; \
 345         } \
 346       else if (c == RUBOUT) \
 347         { \
 348           tui_puts ("^?"); \
 349           printed_len += 2; \
 350         } \
 351       else \
 352         { \
 353           tui_putc (c); \
 354           printed_len++; \
 355         } \
 356     } while (0)
 357
 358 static int
 359 print_filename (char *to_print, char *full_pathname)
 360 {
 361   int printed_len = 0;
 362   char *s;
 363
 364   for (s = to_print; *s; s++)
 365     {
 366       PUTX (*s);
 367     }
 368   return printed_len;
 369 }
 370
 371 /* The user must press "y" or "n".  Non-zero return means "y" pressed.
 372    Comes from readline/complete.c  */
 373 static int
 374 get_y_or_n (void)
 375 {
 376   extern int _rl_abort_internal ();
 377   int c;
 378
 379   for (;;)
 380     {
 381       c = rl_read_key ();
 382       if (c == 'y' || c == 'Y' || c == ' ')
 383         return (1);
 384       if (c == 'n' || c == 'N' || c == RUBOUT)
 385         return (0);
 386       if (c == ABORT_CHAR)
 387         _rl_abort_internal ();
 388       beep ();
 389     }
 390 }
 391
 392 /* A convenience function for displaying a list of strings in
 393    columnar format on readline's output stream.  MATCHES is the list
 394    of strings, in argv format, LEN is the number of strings in MATCHES,
 395    and MAX is the length of the longest string in MATCHES.
 396
 397    Comes from readline/complete.c and modified to write in
 398    the TUI command window using tui_putc/tui_puts.  */
 399 static void
 400 tui_rl_display_match_list (char **matches, int len, int max)
 401 {
 402   typedef int QSFUNC (const void *, const void *);
 403   extern int _rl_qsort_string_compare (const void*, const void*);
 404   extern int _rl_print_completions_horizontally;
 405
 406   int count, limit, printed_len;
 407   int i, j, k, l;
 408   char *temp;
 409
 410   /* Screen dimension correspond to the TUI command window.  */
 411   int screenwidth = TUI_CMD_WIN->generic.width;
 412
 413   /* If there are many items, then ask the user if she really wants to
 414      see them all. */
 415   if (len >= rl_completion_query_items)
 416     {
 417       char msg[256];
 418
 419       sprintf (msg, "\nDisplay all %d possibilities? (y or n)", len);
 420       tui_puts (msg);
 421       if (get_y_or_n () == 0)
 422         {
 423           tui_puts ("\n");
 424           return;
 425         }
 426     }
 427
 428   /* How many items of MAX length can we fit in the screen window? */
 429   max += 2;
 430   limit = screenwidth / max;
 431   if (limit != 1 && (limit * max == screenwidth))
 432     limit--;
 433
 434   /* Avoid a possible floating exception.  If max > screenwidth,
 435      limit will be 0 and a divide-by-zero fault will result. */
 436   if (limit == 0)
 437     limit = 1;
 438
 439   /* How many iterations of the printing loop? */
 440   count = (len + (limit - 1)) / limit;
 441
 442   /* Watch out for special case.  If LEN is less than LIMIT, then
 443      just do the inner printing loop.
 444            0 < len <= limit  implies  count = 1. */
 445
 446   /* Sort the items if they are not already sorted. */
 447   if (rl_ignore_completion_duplicates == 0)
 448     qsort (matches + 1, len, sizeof (char *),
 449            (QSFUNC *)_rl_qsort_string_compare);
 450
 451   tui_putc ('\n');
 452
 453   if (_rl_print_completions_horizontally == 0)
 454     {
 455       /* Print the sorted items, up-and-down alphabetically, like ls. */
 456       for (i = 1; i <= count; i++)
 457         {
 458           for (j = 0, l = i; j < limit; j++)
 459             {
 460               if (l > len || matches[l] == 0)
 461                 break;
 462               else
 463                 {
 464                   temp = printable_part (matches[l]);
 465                   printed_len = print_filename (temp, matches[l]);
 466
 467                   if (j + 1 < limit)
 468                     for (k = 0; k < max - printed_len; k++)
 469                       tui_putc (' ');
 470                 }
 471               l += count;
 472             }
 473           tui_putc ('\n');
 474         }
 475     }
 476   else
 477     {
 478       /* Print the sorted items, across alphabetically, like ls -x. */
 479       for (i = 1; matches[i]; i++)
 480         {
 481           temp = printable_part (matches[i]);
 482           printed_len = print_filename (temp, matches[i]);
 483           /* Have we reached the end of this line? */
 484           if (matches[i+1])
 485             {
 486               if (i && (limit > 1) && (i % limit) == 0)
 487                 tui_putc ('\n');
 488               else
 489                 for (k = 0; k < max - printed_len; k++)
 490                   tui_putc (' ');
 491             }
 492         }
 493       tui_putc ('\n');
 494     }
 495 }
 496
 497 /* Setup the IO for curses or non-curses mode.
 498    - In non-curses mode, readline and gdb use the standard input and
 499    standard output/error directly.
 500    - In curses mode, the standard output/error is controlled by TUI
 501    with the tui_stdout and tui_stderr.  The output is redirected in
 502    the curses command window.  Several readline callbacks are installed
 503    so that readline asks for its input to the curses command window
 504    with wgetch().  */
 505 void
 506 tui_setup_io (int mode)
 507 {
 508   extern int readline_echoing_p;
 509
 510   if (mode)
 511     {
 512       /* Redirect readline to TUI.  */
 513       tui_old_rl_redisplay_function = rl_redisplay_function;
 514       tui_old_rl_deprep_terminal = rl_deprep_term_function;
 515       tui_old_rl_prep_terminal = rl_prep_term_function;
 516       tui_old_rl_getc_function = rl_getc_function;
 517       tui_old_rl_outstream = rl_outstream;
 518       tui_old_readline_echoing_p = readline_echoing_p;
 519       rl_redisplay_function = tui_redisplay_readline;
 520       rl_deprep_term_function = tui_deprep_terminal;
 521       rl_prep_term_function = tui_prep_terminal;
 522       rl_getc_function = tui_getc;
 523       readline_echoing_p = 0;
 524       rl_outstream = tui_rl_outstream;
 525       rl_prompt = 0;
 526       rl_completion_display_matches_hook = tui_rl_display_match_list;
 527       rl_already_prompted = 0;
 528
 529       /* Keep track of previous gdb output.  */
 530       tui_old_stdout = gdb_stdout;
 531       tui_old_stderr = gdb_stderr;
 532       tui_old_uiout = uiout;
 533
 534       /* Reconfigure gdb output.  */
 535       gdb_stdout = tui_stdout;
 536       gdb_stderr = tui_stderr;
 537       gdb_stdlog = gdb_stdout;  /* for moment */
 538       gdb_stdtarg = gdb_stderr; /* for moment */
 539       uiout = tui_out;
 540
 541       /* Save tty for SIGCONT.  */
 542       savetty ();
 543     }
 544   else
 545     {
 546       /* Restore gdb output.  */
 547       gdb_stdout = tui_old_stdout;
 548       gdb_stderr = tui_old_stderr;
 549       gdb_stdlog = gdb_stdout;  /* for moment */
 550       gdb_stdtarg = gdb_stderr; /* for moment */
 551       uiout = tui_old_uiout;
 552
 553       /* Restore readline.  */
 554       rl_redisplay_function = tui_old_rl_redisplay_function;
 555       rl_deprep_term_function = tui_old_rl_deprep_terminal;
 556       rl_prep_term_function = tui_old_rl_prep_terminal;
 557       rl_getc_function = tui_old_rl_getc_function;
 558       rl_outstream = tui_old_rl_outstream;
 559       rl_completion_display_matches_hook = 0;
 560       readline_echoing_p = tui_old_readline_echoing_p;
 561       rl_already_prompted = 0;
 562
 563       /* Save tty for SIGCONT.  */
 564       savetty ();
 565     }
 566 }
 567
 568 #ifdef SIGCONT
 569 /* Catch SIGCONT to restore the terminal and refresh the screen.  */
 570 static void
 571 tui_cont_sig (int sig)
 572 {
 573   if (tui_active)
 574     {
 575       /* Restore the terminal setting because another process (shell)
 576          might have changed it.  */
 577       resetty ();
 578
 579       /* Force a refresh of the screen.  */
 580       tui_refresh_all_win ();
 581
 582       /* Update cursor position on the screen.  */
 583       wmove (TUI_CMD_WIN->generic.handle,
 584              TUI_CMD_WIN->detail.command_info.start_line,
 585              TUI_CMD_WIN->detail.command_info.curch);
 586       wrefresh (TUI_CMD_WIN->generic.handle);
 587     }
 588   signal (sig, tui_cont_sig);
 589 }
 590 #endif
 591
 592 /* Initialize the IO for gdb in curses mode.  */
 593 void
 594 tui_initialize_io (void)
 595 {
 596 #ifdef SIGCONT
 597   signal (SIGCONT, tui_cont_sig);
 598 #endif
 599
 600   /* Create tui output streams.  */
 601   tui_stdout = tui_fileopen (stdout);
 602   tui_stderr = tui_fileopen (stderr);
 603   tui_out = tui_out_new (tui_stdout);
 604
 605   /* Create the default UI.  It is not created because we installed a
 606      deprecated_init_ui_hook.  */
 607   tui_old_uiout = uiout = cli_out_new (gdb_stdout);
 608
 609 #ifdef TUI_USE_PIPE_FOR_READLINE
 610   /* Temporary solution for readline writing to stdout:
 611      redirect readline output in a pipe, read that pipe and
 612      output the content in the curses command window.  */
 613   if (pipe (tui_readline_pipe) != 0)
 614     {
 615       fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
 616       exit (1);
 617     }
 618   tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
 619   if (tui_rl_outstream == 0)
 620     {
 621       fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
 622       exit (1);
 623     }
 624   setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
 625
 626 #ifdef O_NONBLOCK
 627   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
 628 #else
 629 #ifdef O_NDELAY
 630   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
 631 #endif
 632 #endif
 633   add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
 634 #else
 635   tui_rl_outstream = stdout;
 636 #endif
 637 }
 638
 639 /* Get a character from the command window.  This is called from the readline
 640    package.  */
 641 int
 642 tui_getc (FILE *fp)
 643 {
 644   int ch;
 645   WINDOW *w;
 646
 647   w = TUI_CMD_WIN->generic.handle;
 648
 649 #ifdef TUI_USE_PIPE_FOR_READLINE
 650   /* Flush readline output.  */
 651   tui_readline_output (GDB_READABLE, 0);
 652 #endif
 653
 654   ch = wgetch (w);
 655   ch = tui_handle_resize_during_io (ch);
 656
 657   /* The \n must be echoed because it will not be printed by readline.  */
 658   if (ch == '\n')
 659     {
 660       /* When hitting return with an empty input, gdb executes the last
 661          command.  If we emit a newline, this fills up the command window
 662          with empty lines with gdb prompt at beginning.  Instead of that,
 663          stay on the same line but provide a visual effect to show the
 664          user we recognized the command.  */
 665       if (rl_end == 0)
 666         {
 667           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
 668
 669           /* Clear the line.  This will blink the gdb prompt since
 670              it will be redrawn at the same line.  */
 671           wclrtoeol (w);
 672           wrefresh (w);
 673           napms (20);
 674         }
 675       else
 676         {
 677           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
 678                  TUI_CMD_WIN->detail.command_info.curch);
 679           waddch (w, ch);
 680         }
 681     }
 682
 683   if (key_is_command_char (ch))
 684     {                           /* Handle prev/next/up/down here */
 685       ch = tui_dispatch_ctrl_char (ch);
 686     }
 687
 688   if (ch == '\n' || ch == '\r' || ch == '\f')
 689     TUI_CMD_WIN->detail.command_info.curch = 0;
 690   if (ch == KEY_BACKSPACE)
 691     return '\b';
 692
 693   return ch;
 694 }
 695
 696
 697 /* Cleanup when a resize has occured.
 698    Returns the character that must be processed.  */
 699 static unsigned int
 700 tui_handle_resize_during_io (unsigned int original_ch)
 701 {
 702   if (tui_win_resized ())
 703     {
 704       tui_refresh_all_win ();
 705       dont_repeat ();
 706       tui_set_win_resized_to (FALSE);
 707       return '\n';
 708     }
 709   else
 710     return original_ch;
 711 }