gdb/tui/tui-io.c

   1 /* TUI support I/O functions.
   2
   3    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
   4    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., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #include "defs.h"
  26 #include "terminal.h"
  27 #include "target.h"
  28 #include "event-loop.h"
  29 #include "event-top.h"
  30 #include "command.h"
  31 #include "top.h"
  32 #include "readline/readline.h"
  33 #include "tui/tui.h"
  34 #include "tui/tui-data.h"
  35 #include "tui/tui-io.h"
  36 #include "tui/tui-command.h"
  37 #include "tui/tui-win.h"
  38 #include "tui/tui-wingeneral.h"
  39 #include "tui/tui-file.h"
  40 #include "ui-out.h"
  41 #include "cli-out.h"
  42 #include <fcntl.h>
  43 #include <signal.h>
  44 #include <stdio.h>
  45
  46 #ifdef HAVE_NCURSES_H
  47 #include <ncurses.h>
  48 #else
  49 #ifdef HAVE_CURSES_H
  50 #include <curses.h>
  51 #endif
  52 #endif
  53
  54 int
  55 key_is_start_sequence (int ch)
  56 {
  57   return (ch == 27);
  58 }
  59
  60 int
  61 key_is_end_sequence (int ch)
  62 {
  63   return (ch == 126);
  64 }
  65
  66 int
  67 key_is_backspace (int ch)
  68 {
  69   return (ch == 8);
  70 }
  71
  72 int
  73 key_is_command_char (int ch)
  74 {
  75   return ((ch == KEY_NPAGE) || (ch == KEY_PPAGE)
  76           || (ch == KEY_LEFT) || (ch == KEY_RIGHT)
  77           || (ch == KEY_UP) || (ch == KEY_DOWN)
  78           || (ch == KEY_SF) || (ch == KEY_SR)
  79           || (ch == (int)'\f') || key_is_start_sequence (ch));
  80 }
  81
  82 /* Use definition from readline 4.3.  */
  83 #undef CTRL_CHAR
  84 #define CTRL_CHAR(c) ((c) < control_character_threshold && (((c) & 0x80) == 0))
  85
  86 /* This file controls the IO interactions between gdb and curses.
  87    When the TUI is enabled, gdb has two modes a curses and a standard
  88    mode.
  89
  90    In curses mode, the gdb outputs are made in a curses command window.
  91    For this, the gdb_stdout and gdb_stderr are redirected to the specific
  92    ui_file implemented by TUI.  The output is handled by tui_puts().
  93    The input is also controlled by curses with tui_getc().  The readline
  94    library uses this function to get its input.  Several readline hooks
  95    are installed to redirect readline output to the TUI (see also the
  96    note below).
  97
  98    In normal mode, the gdb outputs are restored to their origin, that
  99    is as if TUI is not used.  Readline also uses its original getc()
 100    function with stdin.
 101
 102    Note SCz/2001-07-21: the current readline is not clean in its management of
 103    the output.  Even if we install a redisplay handler, it sometimes writes on
 104    a stdout file.  It is important to redirect every output produced by
 105    readline, otherwise the curses window will be garbled.  This is implemented
 106    with a pipe that TUI reads and readline writes to.  A gdb input handler
 107    is created so that reading the pipe is handled automatically.
 108    This will probably not work on non-Unix platforms.  The best fix is
 109    to make readline clean enougth so that is never write on stdout.
 110
 111    Note SCz/2002-09-01: we now use more readline hooks and it seems that
 112    with them we don't need the pipe anymore (verified by creating the pipe
 113    and closing its end so that write causes a SIGPIPE).  The old pipe code
 114    is still there and can be conditionally removed by
 115    #undef TUI_USE_PIPE_FOR_READLINE.  */
 116
 117 /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel.  */
 118 #define TUI_USE_PIPE_FOR_READLINE
 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 Function *tui_old_rl_getc_function;
 133 static VFunction *tui_old_rl_redisplay_function;
 134 static VFunction *tui_old_rl_prep_terminal;
 135 static VFunction *tui_old_rl_deprep_terminal;
 136 static int tui_old_readline_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 = 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 mode.  */
 214   if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0)
 215     tui_set_key_mode (TUI_SINGLE_KEY_MODE);
 216
 217   if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
 218     prompt = "";
 219   else
 220     prompt = tui_rl_saved_prompt;
 221
 222   c_pos = -1;
 223   c_line = -1;
 224   w = TUI_CMD_WIN->generic.handle;
 225   start_line = TUI_CMD_WIN->detail.command_info.start_line;
 226   wmove (w, start_line, 0);
 227   prev_col = 0;
 228   height = 1;
 229   for (in = 0; prompt && prompt[in]; in++)
 230     {
 231       waddch (w, prompt[in]);
 232       getyx (w, line, col);
 233       if (col < prev_col)
 234         height++;
 235       prev_col = col;
 236     }
 237   for (in = 0; in < rl_end; in++)
 238     {
 239       unsigned char c;
 240
 241       c = (unsigned char) rl_line_buffer[in];
 242       if (in == rl_point)
 243         {
 244           getyx (w, c_line, c_pos);
 245         }
 246
 247       if (CTRL_CHAR (c) || c == RUBOUT)
 248         {
 249           waddch (w, '^');
 250           waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
 251         }
 252       else
 253         {
 254           waddch (w, c);
 255         }
 256       if (c == '\n')
 257         {
 258           getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 259                  TUI_CMD_WIN->detail.command_info.curch);
 260         }
 261       getyx (w, line, col);
 262       if (col < prev_col)
 263         height++;
 264       prev_col = col;
 265     }
 266   wclrtobot (w);
 267   getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 268          TUI_CMD_WIN->detail.command_info.curch);
 269   if (c_line >= 0)
 270     {
 271       wmove (w, c_line, c_pos);
 272       TUI_CMD_WIN->detail.command_info.cur_line = c_line;
 273       TUI_CMD_WIN->detail.command_info.curch = c_pos;
 274     }
 275   TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
 276
 277   wrefresh (w);
 278   fflush(stdout);
 279 }
 280
 281 /* Readline callback to prepare the terminal.  It is called once
 282    each time we enter readline.  Terminal is already setup in curses mode.  */
 283 static void
 284 tui_prep_terminal (int notused1)
 285 {
 286   /* Save the prompt registered in readline to correctly display it.
 287      (we can't use gdb_prompt() due to secondary prompts and can't use
 288      rl_prompt because it points to an alloca buffer).  */
 289   xfree (tui_rl_saved_prompt);
 290   tui_rl_saved_prompt = xstrdup (rl_prompt);
 291 }
 292
 293 /* Readline callback to restore the terminal.  It is called once
 294    each time we leave readline.  There is nothing to do in curses mode.  */
 295 static void
 296 tui_deprep_terminal (void)
 297 {
 298 }
 299
 300 #ifdef TUI_USE_PIPE_FOR_READLINE
 301 /* Read readline output pipe and feed the command window with it.
 302    Should be removed when readline is clean.  */
 303 static void
 304 tui_readline_output (int code, gdb_client_data data)
 305 {
 306   int size;
 307   char buf[256];
 308
 309   size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
 310   if (size > 0 && tui_active)
 311     {
 312       buf[size] = 0;
 313       tui_puts (buf);
 314     }
 315 }
 316 #endif
 317
 318 /* Return the portion of PATHNAME that should be output when listing
 319    possible completions.  If we are hacking filename completion, we
 320    are only interested in the basename, the portion following the
 321    final slash.  Otherwise, we return what we were passed.
 322
 323    Comes from readline/complete.c  */
 324 static char *
 325 printable_part (char *pathname)
 326 {
 327   char *temp;
 328
 329   temp = rl_filename_completion_desired ? strrchr (pathname, '/') : (char *)NULL;
 330 #if defined (__MSDOS__)
 331   if (rl_filename_completion_desired && temp == 0 && isalpha (pathname[0]) && pathname[1] == ':')
 332     temp = pathname + 1;
 333 #endif
 334   return (temp ? ++temp : pathname);
 335 }
 336
 337 /* Output TO_PRINT to rl_outstream.  If VISIBLE_STATS is defined and we
 338    are using it, check for and output a single character for `special'
 339    filenames.  Return the number of characters we 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 (char *to_print, char *full_pathname)
 363 {
 364   int printed_len = 0;
 365   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*, const void*);
 407   extern int _rl_print_completions_horizontally;
 408
 409   int count, limit, printed_len;
 410   int i, j, k, l;
 411   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       sprintf (msg, "\nDisplay all %d possibilities? (y or n)", len);
 423       tui_puts (msg);
 424       if (get_y_or_n () == 0)
 425         {
 426           tui_puts ("\n");
 427           return;
 428         }
 429     }
 430
 431   /* How many items of MAX length can we fit in the screen window? */
 432   max += 2;
 433   limit = screenwidth / max;
 434   if (limit != 1 && (limit * max == screenwidth))
 435     limit--;
 436
 437   /* Avoid a possible floating exception.  If max > screenwidth,
 438      limit will be 0 and a divide-by-zero fault will result. */
 439   if (limit == 0)
 440     limit = 1;
 441
 442   /* How many iterations of the printing loop? */
 443   count = (len + (limit - 1)) / limit;
 444
 445   /* Watch out for special case.  If LEN is less than LIMIT, then
 446      just do the inner printing loop.
 447            0 < len <= limit  implies  count = 1. */
 448
 449   /* Sort the items if they are not already sorted. */
 450   if (rl_ignore_completion_duplicates == 0)
 451     qsort (matches + 1, len, sizeof (char *),
 452            (QSFUNC *)_rl_qsort_string_compare);
 453
 454   tui_putc ('\n');
 455
 456   if (_rl_print_completions_horizontally == 0)
 457     {
 458       /* Print the sorted items, up-and-down alphabetically, like ls. */
 459       for (i = 1; i <= count; i++)
 460         {
 461           for (j = 0, l = i; j < limit; j++)
 462             {
 463               if (l > len || matches[l] == 0)
 464                 break;
 465               else
 466                 {
 467                   temp = printable_part (matches[l]);
 468                   printed_len = print_filename (temp, matches[l]);
 469
 470                   if (j + 1 < limit)
 471                     for (k = 0; k < max - printed_len; k++)
 472                       tui_putc (' ');
 473                 }
 474               l += count;
 475             }
 476           tui_putc ('\n');
 477         }
 478     }
 479   else
 480     {
 481       /* Print the sorted items, across alphabetically, like ls -x. */
 482       for (i = 1; matches[i]; i++)
 483         {
 484           temp = printable_part (matches[i]);
 485           printed_len = print_filename (temp, matches[i]);
 486           /* Have we reached the end of this line? */
 487           if (matches[i+1])
 488             {
 489               if (i && (limit > 1) && (i % limit) == 0)
 490                 tui_putc ('\n');
 491               else
 492                 for (k = 0; k < max - printed_len; k++)
 493                   tui_putc (' ');
 494             }
 495         }
 496       tui_putc ('\n');
 497     }
 498 }
 499
 500 /* Setup the IO for curses or non-curses mode.
 501    - In non-curses mode, readline and gdb use the standard input and
 502    standard output/error directly.
 503    - In curses mode, the standard output/error is controlled by TUI
 504    with the tui_stdout and tui_stderr.  The output is redirected in
 505    the curses command window.  Several readline callbacks are installed
 506    so that readline asks for its input to the curses command window
 507    with wgetch().  */
 508 void
 509 tui_setup_io (int mode)
 510 {
 511   extern int readline_echoing_p;
 512
 513   if (mode)
 514     {
 515       /* Redirect readline to TUI.  */
 516       tui_old_rl_redisplay_function = rl_redisplay_function;
 517       tui_old_rl_deprep_terminal = rl_deprep_term_function;
 518       tui_old_rl_prep_terminal = rl_prep_term_function;
 519       tui_old_rl_getc_function = rl_getc_function;
 520       tui_old_rl_outstream = rl_outstream;
 521       tui_old_readline_echoing_p = readline_echoing_p;
 522       rl_redisplay_function = tui_redisplay_readline;
 523       rl_deprep_term_function = tui_deprep_terminal;
 524       rl_prep_term_function = tui_prep_terminal;
 525       rl_getc_function = tui_getc;
 526       readline_echoing_p = 0;
 527       rl_outstream = tui_rl_outstream;
 528       rl_prompt = 0;
 529       rl_completion_display_matches_hook = tui_rl_display_match_list;
 530       rl_already_prompted = 0;
 531
 532       /* Keep track of previous gdb output.  */
 533       tui_old_stdout = gdb_stdout;
 534       tui_old_stderr = gdb_stderr;
 535       tui_old_uiout = uiout;
 536
 537       /* Reconfigure gdb output.  */
 538       gdb_stdout = tui_stdout;
 539       gdb_stderr = tui_stderr;
 540       gdb_stdlog = gdb_stdout;  /* for moment */
 541       gdb_stdtarg = gdb_stderr; /* for moment */
 542       uiout = tui_out;
 543
 544       /* Save tty for SIGCONT.  */
 545       savetty ();
 546     }
 547   else
 548     {
 549       /* Restore gdb output.  */
 550       gdb_stdout = tui_old_stdout;
 551       gdb_stderr = tui_old_stderr;
 552       gdb_stdlog = gdb_stdout;  /* for moment */
 553       gdb_stdtarg = gdb_stderr; /* for moment */
 554       uiout = tui_old_uiout;
 555
 556       /* Restore readline.  */
 557       rl_redisplay_function = tui_old_rl_redisplay_function;
 558       rl_deprep_term_function = tui_old_rl_deprep_terminal;
 559       rl_prep_term_function = tui_old_rl_prep_terminal;
 560       rl_getc_function = tui_old_rl_getc_function;
 561       rl_outstream = tui_old_rl_outstream;
 562       rl_completion_display_matches_hook = 0;
 563       readline_echoing_p = tui_old_readline_echoing_p;
 564       rl_already_prompted = 0;
 565
 566       /* Save tty for SIGCONT.  */
 567       savetty ();
 568     }
 569 }
 570
 571 #ifdef SIGCONT
 572 /* Catch SIGCONT to restore the terminal and refresh the screen.  */
 573 static void
 574 tui_cont_sig (int sig)
 575 {
 576   if (tui_active)
 577     {
 578       /* Restore the terminal setting because another process (shell)
 579          might have changed it.  */
 580       resetty ();
 581
 582       /* Force a refresh of the screen.  */
 583       tui_refresh_all_win ();
 584
 585       /* Update cursor position on the screen.  */
 586       wmove (TUI_CMD_WIN->generic.handle,
 587              TUI_CMD_WIN->detail.command_info.start_line,
 588              TUI_CMD_WIN->detail.command_info.curch);
 589       wrefresh (TUI_CMD_WIN->generic.handle);
 590     }
 591   signal (sig, tui_cont_sig);
 592 }
 593 #endif
 594
 595 /* Initialize the IO for gdb in curses mode.  */
 596 void
 597 tui_initialize_io (void)
 598 {
 599 #ifdef SIGCONT
 600   signal (SIGCONT, tui_cont_sig);
 601 #endif
 602
 603   /* Create tui output streams.  */
 604   tui_stdout = tui_fileopen (stdout);
 605   tui_stderr = tui_fileopen (stderr);
 606   tui_out = tui_out_new (tui_stdout);
 607
 608   /* Create the default UI.  It is not created because we installed
 609      a init_ui_hook.  */
 610   tui_old_uiout = uiout = cli_out_new (gdb_stdout);
 611
 612 #ifdef TUI_USE_PIPE_FOR_READLINE
 613   /* Temporary solution for readline writing to stdout:
 614      redirect readline output in a pipe, read that pipe and
 615      output the content in the curses command window.  */
 616   if (pipe (tui_readline_pipe) != 0)
 617     {
 618       fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
 619       exit (1);
 620     }
 621   tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
 622   if (tui_rl_outstream == 0)
 623     {
 624       fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
 625       exit (1);
 626     }
 627   setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
 628
 629 #ifdef O_NONBLOCK
 630   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
 631 #else
 632 #ifdef O_NDELAY
 633   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
 634 #endif
 635 #endif
 636   add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
 637 #else
 638   tui_rl_outstream = stdout;
 639 #endif
 640 }
 641
 642 /* Get a character from the command window.  This is called from the readline
 643    package.  */
 644 int
 645 tui_getc (FILE *fp)
 646 {
 647   int ch;
 648   WINDOW *w;
 649
 650   w = TUI_CMD_WIN->generic.handle;
 651
 652 #ifdef TUI_USE_PIPE_FOR_READLINE
 653   /* Flush readline output.  */
 654   tui_readline_output (GDB_READABLE, 0);
 655 #endif
 656
 657   ch = wgetch (w);
 658   ch = tui_handle_resize_during_io (ch);
 659
 660   /* The \n must be echoed because it will not be printed by readline.  */
 661   if (ch == '\n')
 662     {
 663       /* When hitting return with an empty input, gdb executes the last
 664          command.  If we emit a newline, this fills up the command window
 665          with empty lines with gdb prompt at beginning.  Instead of that,
 666          stay on the same line but provide a visual effect to show the
 667          user we recognized the command.  */
 668       if (rl_end == 0)
 669         {
 670           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
 671
 672           /* Clear the line.  This will blink the gdb prompt since
 673              it will be redrawn at the same line.  */
 674           wclrtoeol (w);
 675           wrefresh (w);
 676           napms (20);
 677         }
 678       else
 679         {
 680           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
 681                  TUI_CMD_WIN->detail.command_info.curch);
 682           waddch (w, ch);
 683         }
 684     }
 685
 686   if (key_is_command_char (ch))
 687     {                           /* Handle prev/next/up/down here */
 688       ch = tui_dispatch_ctrl_char (ch);
 689     }
 690
 691   if (ch == '\n' || ch == '\r' || ch == '\f')
 692     TUI_CMD_WIN->detail.command_info.curch = 0;
 693   if (ch == KEY_BACKSPACE)
 694     return '\b';
 695
 696   return ch;
 697 }
 698
 699
 700 /* Cleanup when a resize has occured.
 701    Returns the character that must be processed.  */
 702 static unsigned int
 703 tui_handle_resize_during_io (unsigned int original_ch)
 704 {
 705   if (tui_win_resized ())
 706     {
 707       tui_refresh_all_win ();
 708       dont_repeat ();
 709       tui_set_win_resized_to (FALSE);
 710       return '\n';
 711     }
 712   else
 713     return original_ch;
 714 }