gdb/tui/tui-io.c

   1 /* TUI support I/O functions.
   2
   3    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009,
   4    2010 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 3 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, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "target.h"
  25 #include "event-loop.h"
  26 #include "event-top.h"
  27 #include "command.h"
  28 #include "top.h"
  29 #include "tui/tui.h"
  30 #include "tui/tui-data.h"
  31 #include "tui/tui-io.h"
  32 #include "tui/tui-command.h"
  33 #include "tui/tui-win.h"
  34 #include "tui/tui-wingeneral.h"
  35 #include "tui/tui-file.h"
  36 #include "ui-out.h"
  37 #include "cli-out.h"
  38 #include <fcntl.h>
  39 #include <signal.h>
  40 #include <stdio.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 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
 214      mode.  */
 215   if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0)
 216     tui_set_key_mode (TUI_SINGLE_KEY_MODE);
 217
 218   if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
 219     prompt = "";
 220   else
 221     prompt = tui_rl_saved_prompt;
 222
 223   c_pos = -1;
 224   c_line = -1;
 225   w = TUI_CMD_WIN->generic.handle;
 226   start_line = TUI_CMD_WIN->detail.command_info.start_line;
 227   wmove (w, start_line, 0);
 228   prev_col = 0;
 229   height = 1;
 230   for (in = 0; prompt && prompt[in]; in++)
 231     {
 232       waddch (w, prompt[in]);
 233       getyx (w, line, col);
 234       if (col < prev_col)
 235         height++;
 236       prev_col = col;
 237     }
 238   for (in = 0; in < rl_end; in++)
 239     {
 240       unsigned char c;
 241
 242       c = (unsigned char) rl_line_buffer[in];
 243       if (in == rl_point)
 244         {
 245           getyx (w, c_line, c_pos);
 246         }
 247
 248       if (CTRL_CHAR (c) || c == RUBOUT)
 249         {
 250           waddch (w, '^');
 251           waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
 252         }
 253       else
 254         {
 255           waddch (w, c);
 256         }
 257       if (c == '\n')
 258         {
 259           getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 260                  TUI_CMD_WIN->detail.command_info.curch);
 261         }
 262       getyx (w, line, col);
 263       if (col < prev_col)
 264         height++;
 265       prev_col = col;
 266     }
 267   wclrtobot (w);
 268   getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 269          TUI_CMD_WIN->detail.command_info.curch);
 270   if (c_line >= 0)
 271     {
 272       wmove (w, c_line, c_pos);
 273       TUI_CMD_WIN->detail.command_info.cur_line = c_line;
 274       TUI_CMD_WIN->detail.command_info.curch = c_pos;
 275     }
 276   TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
 277
 278   wrefresh (w);
 279   fflush(stdout);
 280 }
 281
 282 /* Readline callback to prepare the terminal.  It is called once each
 283    time we enter readline.  Terminal is already setup in curses
 284    mode.  */
 285 static void
 286 tui_prep_terminal (int notused1)
 287 {
 288   /* Save the prompt registered in readline to correctly display it.
 289      (we can't use gdb_prompt() due to secondary prompts and can't use
 290      rl_prompt because it points to an alloca buffer).  */
 291   xfree (tui_rl_saved_prompt);
 292   tui_rl_saved_prompt = xstrdup (rl_prompt);
 293 }
 294
 295 /* Readline callback to restore the terminal.  It is called once each
 296    time we leave readline.  There is nothing to do in curses mode.  */
 297 static void
 298 tui_deprep_terminal (void)
 299 {
 300 }
 301
 302 #ifdef TUI_USE_PIPE_FOR_READLINE
 303 /* Read readline output pipe and feed the command window with it.
 304    Should be removed when readline is clean.  */
 305 static void
 306 tui_readline_output (int error, gdb_client_data data)
 307 {
 308   int size;
 309   char buf[256];
 310
 311   size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
 312   if (size > 0 && tui_active)
 313     {
 314       buf[size] = 0;
 315       tui_puts (buf);
 316     }
 317 }
 318 #endif
 319
 320 /* Return the portion of PATHNAME that should be output when listing
 321    possible completions.  If we are hacking filename completion, we
 322    are only interested in the basename, the portion following the
 323    final slash.  Otherwise, we return what we were passed.
 324
 325    Comes from readline/complete.c.  */
 326 static char *
 327 printable_part (char *pathname)
 328 {
 329   char *temp;
 330
 331   temp = rl_filename_completion_desired ? strrchr (pathname, '/') : (char *)NULL;
 332 #if defined (__MSDOS__)
 333   if (rl_filename_completion_desired
 334       && temp == 0 && isalpha (pathname[0])
 335       && pathname[1] == ':')
 336     temp = pathname + 1;
 337 #endif
 338   return (temp ? ++temp : pathname);
 339 }
 340
 341 /* Output TO_PRINT to rl_outstream.  If VISIBLE_STATS is defined and
 342    we are using it, check for and output a single character for
 343    `special' filenames.  Return the number of characters we
 344    output.  */
 345
 346 #define PUTX(c) \
 347     do { \
 348       if (CTRL_CHAR (c)) \
 349         { \
 350           tui_puts ("^"); \
 351           tui_putc (UNCTRL (c)); \
 352           printed_len += 2; \
 353         } \
 354       else if (c == RUBOUT) \
 355         { \
 356           tui_puts ("^?"); \
 357           printed_len += 2; \
 358         } \
 359       else \
 360         { \
 361           tui_putc (c); \
 362           printed_len++; \
 363         } \
 364     } while (0)
 365
 366 static int
 367 print_filename (char *to_print, char *full_pathname)
 368 {
 369   int printed_len = 0;
 370   char *s;
 371
 372   for (s = to_print; *s; s++)
 373     {
 374       PUTX (*s);
 375     }
 376   return printed_len;
 377 }
 378
 379 /* The user must press "y" or "n".  Non-zero return means "y" pressed.
 380    Comes from readline/complete.c.  */
 381 static int
 382 get_y_or_n (void)
 383 {
 384   extern int _rl_abort_internal ();
 385   int c;
 386
 387   for (;;)
 388     {
 389       c = rl_read_key ();
 390       if (c == 'y' || c == 'Y' || c == ' ')
 391         return (1);
 392       if (c == 'n' || c == 'N' || c == RUBOUT)
 393         return (0);
 394       if (c == ABORT_CHAR)
 395         _rl_abort_internal ();
 396       beep ();
 397     }
 398 }
 399
 400 /* A convenience function for displaying a list of strings in
 401    columnar format on readline's output stream.  MATCHES is the list
 402    of strings, in argv format, LEN is the number of strings in MATCHES,
 403    and MAX is the length of the longest string in MATCHES.
 404
 405    Comes from readline/complete.c and modified to write in
 406    the TUI command window using tui_putc/tui_puts.  */
 407 static void
 408 tui_rl_display_match_list (char **matches, int len, int max)
 409 {
 410   typedef int QSFUNC (const void *, const void *);
 411   extern int _rl_qsort_string_compare (const void *,
 412                                        const void *);
 413   extern int _rl_print_completions_horizontally;
 414
 415   int count, limit, printed_len;
 416   int i, j, k, l;
 417   char *temp;
 418
 419   /* Screen dimension correspond to the TUI command window.  */
 420   int screenwidth = TUI_CMD_WIN->generic.width;
 421
 422   /* If there are many items, then ask the user if she really wants to
 423      see them all.  */
 424   if (len >= rl_completion_query_items)
 425     {
 426       char msg[256];
 427
 428       sprintf (msg, "\nDisplay all %d possibilities? (y or n)", len);
 429       tui_puts (msg);
 430       if (get_y_or_n () == 0)
 431         {
 432           tui_puts ("\n");
 433           return;
 434         }
 435     }
 436
 437   /* How many items of MAX length can we fit in the screen window?  */
 438   max += 2;
 439   limit = screenwidth / max;
 440   if (limit != 1 && (limit * max == screenwidth))
 441     limit--;
 442
 443   /* Avoid a possible floating exception.  If max > screenwidth, limit
 444      will be 0 and a divide-by-zero fault will result.  */
 445   if (limit == 0)
 446     limit = 1;
 447
 448   /* How many iterations of the printing loop?  */
 449   count = (len + (limit - 1)) / limit;
 450
 451   /* Watch out for special case.  If LEN is less than LIMIT, then
 452      just do the inner printing loop.
 453            0 < len <= limit  implies  count = 1.  */
 454
 455   /* Sort the items if they are not already sorted.  */
 456   if (rl_ignore_completion_duplicates == 0)
 457     qsort (matches + 1, len, sizeof (char *),
 458            (QSFUNC *)_rl_qsort_string_compare);
 459
 460   tui_putc ('\n');
 461
 462   if (_rl_print_completions_horizontally == 0)
 463     {
 464       /* Print the sorted items, up-and-down alphabetically, like ls.  */
 465       for (i = 1; i <= count; i++)
 466         {
 467           for (j = 0, l = i; j < limit; j++)
 468             {
 469               if (l > len || matches[l] == 0)
 470                 break;
 471               else
 472                 {
 473                   temp = printable_part (matches[l]);
 474                   printed_len = print_filename (temp, matches[l]);
 475
 476                   if (j + 1 < limit)
 477                     for (k = 0; k < max - printed_len; k++)
 478                       tui_putc (' ');
 479                 }
 480               l += count;
 481             }
 482           tui_putc ('\n');
 483         }
 484     }
 485   else
 486     {
 487       /* Print the sorted items, across alphabetically, like ls -x.  */
 488       for (i = 1; matches[i]; i++)
 489         {
 490           temp = printable_part (matches[i]);
 491           printed_len = print_filename (temp, matches[i]);
 492           /* Have we reached the end of this line?  */
 493           if (matches[i+1])
 494             {
 495               if (i && (limit > 1) && (i % limit) == 0)
 496                 tui_putc ('\n');
 497               else
 498                 for (k = 0; k < max - printed_len; k++)
 499                   tui_putc (' ');
 500             }
 501         }
 502       tui_putc ('\n');
 503     }
 504 }
 505
 506 /* Setup the IO for curses or non-curses mode.
 507    - In non-curses mode, readline and gdb use the standard input and
 508    standard output/error directly.
 509    - In curses mode, the standard output/error is controlled by TUI
 510    with the tui_stdout and tui_stderr.  The output is redirected in
 511    the curses command window.  Several readline callbacks are installed
 512    so that readline asks for its input to the curses command window
 513    with wgetch().  */
 514 void
 515 tui_setup_io (int mode)
 516 {
 517   extern int readline_echoing_p;
 518
 519   if (mode)
 520     {
 521       /* Redirect readline to TUI.  */
 522       tui_old_rl_redisplay_function = rl_redisplay_function;
 523       tui_old_rl_deprep_terminal = rl_deprep_term_function;
 524       tui_old_rl_prep_terminal = rl_prep_term_function;
 525       tui_old_rl_getc_function = rl_getc_function;
 526       tui_old_rl_outstream = rl_outstream;
 527       tui_old_readline_echoing_p = readline_echoing_p;
 528       rl_redisplay_function = tui_redisplay_readline;
 529       rl_deprep_term_function = tui_deprep_terminal;
 530       rl_prep_term_function = tui_prep_terminal;
 531       rl_getc_function = tui_getc;
 532       readline_echoing_p = 0;
 533       rl_outstream = tui_rl_outstream;
 534       rl_prompt = 0;
 535       rl_completion_display_matches_hook = tui_rl_display_match_list;
 536       rl_already_prompted = 0;
 537
 538       /* Keep track of previous gdb output.  */
 539       tui_old_stdout = gdb_stdout;
 540       tui_old_stderr = gdb_stderr;
 541       tui_old_uiout = uiout;
 542
 543       /* Reconfigure gdb output.  */
 544       gdb_stdout = tui_stdout;
 545       gdb_stderr = tui_stderr;
 546       gdb_stdlog = gdb_stdout;  /* for moment */
 547       gdb_stdtarg = gdb_stderr; /* for moment */
 548       uiout = tui_out;
 549
 550       /* Save tty for SIGCONT.  */
 551       savetty ();
 552     }
 553   else
 554     {
 555       /* Restore gdb output.  */
 556       gdb_stdout = tui_old_stdout;
 557       gdb_stderr = tui_old_stderr;
 558       gdb_stdlog = gdb_stdout;  /* for moment */
 559       gdb_stdtarg = gdb_stderr; /* for moment */
 560       uiout = tui_old_uiout;
 561
 562       /* Restore readline.  */
 563       rl_redisplay_function = tui_old_rl_redisplay_function;
 564       rl_deprep_term_function = tui_old_rl_deprep_terminal;
 565       rl_prep_term_function = tui_old_rl_prep_terminal;
 566       rl_getc_function = tui_old_rl_getc_function;
 567       rl_outstream = tui_old_rl_outstream;
 568       rl_completion_display_matches_hook = 0;
 569       readline_echoing_p = tui_old_readline_echoing_p;
 570       rl_already_prompted = 0;
 571
 572       /* Save tty for SIGCONT.  */
 573       savetty ();
 574     }
 575 }
 576
 577 #ifdef SIGCONT
 578 /* Catch SIGCONT to restore the terminal and refresh the screen.  */
 579 static void
 580 tui_cont_sig (int sig)
 581 {
 582   if (tui_active)
 583     {
 584       /* Restore the terminal setting because another process (shell)
 585          might have changed it.  */
 586       resetty ();
 587
 588       /* Force a refresh of the screen.  */
 589       tui_refresh_all_win ();
 590
 591       /* Update cursor position on the screen.  */
 592       wmove (TUI_CMD_WIN->generic.handle,
 593              TUI_CMD_WIN->detail.command_info.start_line,
 594              TUI_CMD_WIN->detail.command_info.curch);
 595       wrefresh (TUI_CMD_WIN->generic.handle);
 596     }
 597   signal (sig, tui_cont_sig);
 598 }
 599 #endif
 600
 601 /* Initialize the IO for gdb in curses mode.  */
 602 void
 603 tui_initialize_io (void)
 604 {
 605 #ifdef SIGCONT
 606   signal (SIGCONT, tui_cont_sig);
 607 #endif
 608
 609   /* Create tui output streams.  */
 610   tui_stdout = tui_fileopen (stdout);
 611   tui_stderr = tui_fileopen (stderr);
 612   tui_out = tui_out_new (tui_stdout);
 613
 614   /* Create the default UI.  It is not created because we installed a
 615      deprecated_init_ui_hook.  */
 616   tui_old_uiout = uiout = cli_out_new (gdb_stdout);
 617
 618 #ifdef TUI_USE_PIPE_FOR_READLINE
 619   /* Temporary solution for readline writing to stdout: redirect
 620      readline output in a pipe, read that pipe and output the content
 621      in the curses command window.  */
 622   if (pipe (tui_readline_pipe) != 0)
 623     {
 624       fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
 625       exit (1);
 626     }
 627   tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
 628   if (tui_rl_outstream == 0)
 629     {
 630       fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
 631       exit (1);
 632     }
 633   setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
 634
 635 #ifdef O_NONBLOCK
 636   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
 637 #else
 638 #ifdef O_NDELAY
 639   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
 640 #endif
 641 #endif
 642   add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
 643 #else
 644   tui_rl_outstream = stdout;
 645 #endif
 646 }
 647
 648 /* Get a character from the command window.  This is called from the
 649    readline package.  */
 650 int
 651 tui_getc (FILE *fp)
 652 {
 653   int ch;
 654   WINDOW *w;
 655
 656   w = TUI_CMD_WIN->generic.handle;
 657
 658 #ifdef TUI_USE_PIPE_FOR_READLINE
 659   /* Flush readline output.  */
 660   tui_readline_output (0, 0);
 661 #endif
 662
 663   ch = wgetch (w);
 664   ch = tui_handle_resize_during_io (ch);
 665
 666   /* The \n must be echoed because it will not be printed by
 667      readline.  */
 668   if (ch == '\n')
 669     {
 670       /* When hitting return with an empty input, gdb executes the last
 671          command.  If we emit a newline, this fills up the command window
 672          with empty lines with gdb prompt at beginning.  Instead of that,
 673          stay on the same line but provide a visual effect to show the
 674          user we recognized the command.  */
 675       if (rl_end == 0)
 676         {
 677           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
 678
 679           /* Clear the line.  This will blink the gdb prompt since
 680              it will be redrawn at the same line.  */
 681           wclrtoeol (w);
 682           wrefresh (w);
 683           napms (20);
 684         }
 685       else
 686         {
 687           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
 688                  TUI_CMD_WIN->detail.command_info.curch);
 689           waddch (w, ch);
 690         }
 691     }
 692
 693   if (key_is_command_char (ch))
 694     {                           /* Handle prev/next/up/down here.  */
 695       ch = tui_dispatch_ctrl_char (ch);
 696     }
 697
 698   if (ch == '\n' || ch == '\r' || ch == '\f')
 699     TUI_CMD_WIN->detail.command_info.curch = 0;
 700   if (ch == KEY_BACKSPACE)
 701     return '\b';
 702
 703   return ch;
 704 }
 705
 706
 707 /* Cleanup when a resize has occured.
 708    Returns the character that must be processed.  */
 709 static unsigned int
 710 tui_handle_resize_during_io (unsigned int original_ch)
 711 {
 712   if (tui_win_resized ())
 713     {
 714       tui_resize_all ();
 715       tui_refresh_all_win ();
 716       dont_repeat ();
 717       tui_set_win_resized_to (FALSE);
 718       return '\n';
 719     }
 720   else
 721     return original_ch;
 722 }