gdb/tui/tui-io.c

   1 /* TUI support I/O functions.
   2
   3    Copyright (C) 1998-2014 Free Software Foundation, Inc.
   4
   5    Contributed by Hewlett-Packard Company.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "target.h"
  24 #include "event-loop.h"
  25 #include "event-top.h"
  26 #include "command.h"
  27 #include "top.h"
  28 #include "tui/tui.h"
  29 #include "tui/tui-data.h"
  30 #include "tui/tui-io.h"
  31 #include "tui/tui-command.h"
  32 #include "tui/tui-win.h"
  33 #include "tui/tui-wingeneral.h"
  34 #include "tui/tui-file.h"
  35 #include "ui-out.h"
  36 #include "cli-out.h"
  37 #include <fcntl.h>
  38 #include <signal.h>
  39 #include <stdio.h>
  40 #include "filestuff.h"
  41
  42 #include "gdb_curses.h"
  43
  44 /* This redefines CTRL if it is not already defined, so it must come
  45    after terminal state releated include files like <term.h> and
  46    "gdb_curses.h".  */
  47 #include "readline/readline.h"
  48
  49 int
  50 key_is_start_sequence (int ch)
  51 {
  52   return (ch == 27);
  53 }
  54
  55 int
  56 key_is_end_sequence (int ch)
  57 {
  58   return (ch == 126);
  59 }
  60
  61 int
  62 key_is_backspace (int ch)
  63 {
  64   return (ch == 8);
  65 }
  66
  67 int
  68 key_is_command_char (int ch)
  69 {
  70   return ((ch == KEY_NPAGE) || (ch == KEY_PPAGE)
  71           || (ch == KEY_LEFT) || (ch == KEY_RIGHT)
  72           || (ch == KEY_UP) || (ch == KEY_DOWN)
  73           || (ch == KEY_SF) || (ch == KEY_SR)
  74           || (ch == (int)'\f')
  75           || key_is_start_sequence (ch));
  76 }
  77
  78 /* Use definition from readline 4.3.  */
  79 #undef CTRL_CHAR
  80 #define CTRL_CHAR(c) \
  81      ((c) < control_character_threshold && (((c) & 0x80) == 0))
  82
  83 /* This file controls the IO interactions between gdb and curses.
  84    When the TUI is enabled, gdb has two modes a curses and a standard
  85    mode.
  86
  87    In curses mode, the gdb outputs are made in a curses command
  88    window.  For this, the gdb_stdout and gdb_stderr are redirected to
  89    the specific ui_file implemented by TUI.  The output is handled by
  90    tui_puts().  The input is also controlled by curses with
  91    tui_getc().  The readline library uses this function to get its
  92    input.  Several readline hooks are installed to redirect readline
  93    output to the TUI (see also the note below).
  94
  95    In normal mode, the gdb outputs are restored to their origin, that
  96    is as if TUI is not used.  Readline also uses its original getc()
  97    function with stdin.
  98
  99    Note SCz/2001-07-21: the current readline is not clean in its
 100    management of the output.  Even if we install a redisplay handler,
 101    it sometimes writes on a stdout file.  It is important to redirect
 102    every output produced by readline, otherwise the curses window will
 103    be garbled.  This is implemented with a pipe that TUI reads and
 104    readline writes to.  A gdb input handler is created so that reading
 105    the pipe is handled automatically.  This will probably not work on
 106    non-Unix platforms.  The best fix is to make readline clean enougth
 107    so that is never write on stdout.
 108
 109    Note SCz/2002-09-01: we now use more readline hooks and it seems
 110    that with them we don't need the pipe anymore (verified by creating
 111    the pipe and closing its end so that write causes a SIGPIPE).  The
 112    old pipe code is still there and can be conditionally removed by
 113    #undef TUI_USE_PIPE_FOR_READLINE.  */
 114
 115 /* For gdb 5.3, prefer to continue the pipe hack as a backup wheel.  */
 116 #ifdef HAVE_PIPE
 117 #define TUI_USE_PIPE_FOR_READLINE
 118 #endif
 119 /* #undef TUI_USE_PIPE_FOR_READLINE */
 120
 121 /* TUI output files.  */
 122 static struct ui_file *tui_stdout;
 123 static struct ui_file *tui_stderr;
 124 struct ui_out *tui_out;
 125
 126 /* GDB output files in non-curses mode.  */
 127 static struct ui_file *tui_old_stdout;
 128 static struct ui_file *tui_old_stderr;
 129 struct ui_out *tui_old_uiout;
 130
 131 /* Readline previous hooks.  */
 132 static rl_getc_func_t *tui_old_rl_getc_function;
 133 static rl_voidfunc_t *tui_old_rl_redisplay_function;
 134 static rl_vintfunc_t *tui_old_rl_prep_terminal;
 135 static rl_voidfunc_t *tui_old_rl_deprep_terminal;
 136 static int tui_old_rl_echoing_p;
 137
 138 /* Readline output stream.
 139    Should be removed when readline is clean.  */
 140 static FILE *tui_rl_outstream;
 141 static FILE *tui_old_rl_outstream;
 142 #ifdef TUI_USE_PIPE_FOR_READLINE
 143 static int tui_readline_pipe[2];
 144 #endif
 145
 146 /* The last gdb prompt that was registered in readline.
 147    This may be the main gdb prompt or a secondary prompt.  */
 148 static char *tui_rl_saved_prompt;
 149
 150 static unsigned int tui_handle_resize_during_io (unsigned int);
 151
 152 static void
 153 tui_putc (char c)
 154 {
 155   char buf[2];
 156
 157   buf[0] = c;
 158   buf[1] = 0;
 159   tui_puts (buf);
 160 }
 161
 162 /* Print the string in the curses command window.  */
 163 void
 164 tui_puts (const char *string)
 165 {
 166   static int tui_skip_line = -1;
 167   char c;
 168   WINDOW *w;
 169
 170   w = TUI_CMD_WIN->generic.handle;
 171   while ((c = *string++) != 0)
 172     {
 173       /* Catch annotation and discard them.  We need two \032 and
 174          discard until a \n is seen.  */
 175       if (c == '\032')
 176         {
 177           tui_skip_line++;
 178         }
 179       else if (tui_skip_line != 1)
 180         {
 181           tui_skip_line = -1;
 182           waddch (w, c);
 183         }
 184       else if (c == '\n')
 185         tui_skip_line = -1;
 186     }
 187   getyx (w, TUI_CMD_WIN->detail.command_info.cur_line,
 188          TUI_CMD_WIN->detail.command_info.curch);
 189   TUI_CMD_WIN->detail.command_info.start_line
 190     = TUI_CMD_WIN->detail.command_info.cur_line;
 191
 192   /* We could defer the following.  */
 193   wrefresh (w);
 194   fflush (stdout);
 195 }
 196
 197 /* Readline callback.
 198    Redisplay the command line with its prompt after readline has
 199    changed the edited text.  */
 200 void
 201 tui_redisplay_readline (void)
 202 {
 203   int prev_col;
 204   int height;
 205   int col, line;
 206   int c_pos;
 207   int c_line;
 208   int in;
 209   WINDOW *w;
 210   char *prompt;
 211   int start_line;
 212
 213   /* Detect when we temporarily left SingleKey and now the readline
 214      edit buffer is empty, automatically restore the SingleKey
 215      mode.  The restore must only be done if the command has finished.
 216      The command could call prompt_for_continue and we must not
 217      restore SingleKey so that the prompt and normal keymap are used.  */
 218   if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0
 219       && immediate_quit == 0)
 220     tui_set_key_mode (TUI_SINGLE_KEY_MODE);
 221
 222   if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
 223     prompt = "";
 224   else
 225     prompt = tui_rl_saved_prompt;
 226
 227   c_pos = -1;
 228   c_line = -1;
 229   w = TUI_CMD_WIN->generic.handle;
 230   start_line = TUI_CMD_WIN->detail.command_info.start_line;
 231   wmove (w, start_line, 0);
 232   prev_col = 0;
 233   height = 1;
 234   for (in = 0; prompt && prompt[in]; in++)
 235     {
 236       waddch (w, prompt[in]);
 237       getyx (w, line, col);
 238       if (col < prev_col)
 239         height++;
 240       prev_col = col;
 241     }
 242   for (in = 0; in < rl_end; in++)
 243     {
 244       unsigned char c;
 245
 246       c = (unsigned char) rl_line_buffer[in];
 247       if (in == rl_point)
 248         {
 249           getyx (w, c_line, c_pos);
 250         }
 251
 252       if (CTRL_CHAR (c) || c == RUBOUT)
 253         {
 254           waddch (w, '^');
 255           waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
 256         }
 257       else
 258         {
 259           waddch (w, c);
 260         }
 261       if (c == '\n')
 262         {
 263           getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 264                  TUI_CMD_WIN->detail.command_info.curch);
 265         }
 266       getyx (w, line, col);
 267       if (col < prev_col)
 268         height++;
 269       prev_col = col;
 270     }
 271   wclrtobot (w);
 272   getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 273          TUI_CMD_WIN->detail.command_info.curch);
 274   if (c_line >= 0)
 275     {
 276       wmove (w, c_line, c_pos);
 277       TUI_CMD_WIN->detail.command_info.cur_line = c_line;
 278       TUI_CMD_WIN->detail.command_info.curch = c_pos;
 279     }
 280   TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
 281
 282   wrefresh (w);
 283   fflush(stdout);
 284 }
 285
 286 /* Readline callback to prepare the terminal.  It is called once each
 287    time we enter readline.  Terminal is already setup in curses
 288    mode.  */
 289 static void
 290 tui_prep_terminal (int notused1)
 291 {
 292   /* Save the prompt registered in readline to correctly display it.
 293      (we can't use gdb_prompt() due to secondary prompts and can't use
 294      rl_prompt because it points to an alloca buffer).  */
 295   xfree (tui_rl_saved_prompt);
 296   tui_rl_saved_prompt = xstrdup (rl_prompt);
 297 }
 298
 299 /* Readline callback to restore the terminal.  It is called once each
 300    time we leave readline.  There is nothing to do in curses mode.  */
 301 static void
 302 tui_deprep_terminal (void)
 303 {
 304 }
 305
 306 #ifdef TUI_USE_PIPE_FOR_READLINE
 307 /* Read readline output pipe and feed the command window with it.
 308    Should be removed when readline is clean.  */
 309 static void
 310 tui_readline_output (int error, gdb_client_data data)
 311 {
 312   int size;
 313   char buf[256];
 314
 315   size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
 316   if (size > 0 && tui_active)
 317     {
 318       buf[size] = 0;
 319       tui_puts (buf);
 320     }
 321 }
 322 #endif
 323
 324 /* Return the portion of PATHNAME that should be output when listing
 325    possible completions.  If we are hacking filename completion, we
 326    are only interested in the basename, the portion following the
 327    final slash.  Otherwise, we return what we were passed.
 328
 329    Comes from readline/complete.c.  */
 330 static const char *
 331 printable_part (const char *pathname)
 332 {
 333   return rl_filename_completion_desired ? lbasename (pathname) : pathname;
 334 }
 335
 336 /* Output TO_PRINT to rl_outstream.  If VISIBLE_STATS is defined and
 337    we are using it, check for and output a single character for
 338    `special' filenames.  Return the number of characters we
 339    output.  */
 340
 341 #define PUTX(c) \
 342     do { \
 343       if (CTRL_CHAR (c)) \
 344         { \
 345           tui_puts ("^"); \
 346           tui_putc (UNCTRL (c)); \
 347           printed_len += 2; \
 348         } \
 349       else if (c == RUBOUT) \
 350         { \
 351           tui_puts ("^?"); \
 352           printed_len += 2; \
 353         } \
 354       else \
 355         { \
 356           tui_putc (c); \
 357           printed_len++; \
 358         } \
 359     } while (0)
 360
 361 static int
 362 print_filename (const char *to_print, const char *full_pathname)
 363 {
 364   int printed_len = 0;
 365   const char *s;
 366
 367   for (s = to_print; *s; s++)
 368     {
 369       PUTX (*s);
 370     }
 371   return printed_len;
 372 }
 373
 374 /* The user must press "y" or "n".  Non-zero return means "y" pressed.
 375    Comes from readline/complete.c.  */
 376 static int
 377 get_y_or_n (void)
 378 {
 379   extern int _rl_abort_internal ();
 380   int c;
 381
 382   for (;;)
 383     {
 384       c = rl_read_key ();
 385       if (c == 'y' || c == 'Y' || c == ' ')
 386         return (1);
 387       if (c == 'n' || c == 'N' || c == RUBOUT)
 388         return (0);
 389       if (c == ABORT_CHAR)
 390         _rl_abort_internal ();
 391       beep ();
 392     }
 393 }
 394
 395 /* A convenience function for displaying a list of strings in
 396    columnar format on readline's output stream.  MATCHES is the list
 397    of strings, in argv format, LEN is the number of strings in MATCHES,
 398    and MAX is the length of the longest string in MATCHES.
 399
 400    Comes from readline/complete.c and modified to write in
 401    the TUI command window using tui_putc/tui_puts.  */
 402 static void
 403 tui_rl_display_match_list (char **matches, int len, int max)
 404 {
 405   typedef int QSFUNC (const void *, const void *);
 406   extern int _rl_qsort_string_compare (const void *,
 407                                        const void *);
 408   extern int _rl_print_completions_horizontally;
 409
 410   int count, limit, printed_len;
 411   int i, j, k, l;
 412   const char *temp;
 413
 414   /* Screen dimension correspond to the TUI command window.  */
 415   int screenwidth = TUI_CMD_WIN->generic.width;
 416
 417   /* If there are many items, then ask the user if she really wants to
 418      see them all.  */
 419   if (len >= rl_completion_query_items)
 420     {
 421       char msg[256];
 422
 423       xsnprintf (msg, sizeof (msg),
 424                  "\nDisplay all %d possibilities? (y or n)", len);
 425       tui_puts (msg);
 426       if (get_y_or_n () == 0)
 427         {
 428           tui_puts ("\n");
 429           return;
 430         }
 431     }
 432
 433   /* How many items of MAX length can we fit in the screen window?  */
 434   max += 2;
 435   limit = screenwidth / max;
 436   if (limit != 1 && (limit * max == screenwidth))
 437     limit--;
 438
 439   /* Avoid a possible floating exception.  If max > screenwidth, limit
 440      will be 0 and a divide-by-zero fault will result.  */
 441   if (limit == 0)
 442     limit = 1;
 443
 444   /* How many iterations of the printing loop?  */
 445   count = (len + (limit - 1)) / limit;
 446
 447   /* Watch out for special case.  If LEN is less than LIMIT, then
 448      just do the inner printing loop.
 449            0 < len <= limit  implies  count = 1.  */
 450
 451   /* Sort the items if they are not already sorted.  */
 452   if (rl_ignore_completion_duplicates == 0)
 453     qsort (matches + 1, len, sizeof (char *),
 454            (QSFUNC *)_rl_qsort_string_compare);
 455
 456   tui_putc ('\n');
 457
 458   if (_rl_print_completions_horizontally == 0)
 459     {
 460       /* Print the sorted items, up-and-down alphabetically, like ls.  */
 461       for (i = 1; i <= count; i++)
 462         {
 463           for (j = 0, l = i; j < limit; j++)
 464             {
 465               if (l > len || matches[l] == 0)
 466                 break;
 467               else
 468                 {
 469                   temp = printable_part (matches[l]);
 470                   printed_len = print_filename (temp, matches[l]);
 471
 472                   if (j + 1 < limit)
 473                     for (k = 0; k < max - printed_len; k++)
 474                       tui_putc (' ');
 475                 }
 476               l += count;
 477             }
 478           tui_putc ('\n');
 479         }
 480     }
 481   else
 482     {
 483       /* Print the sorted items, across alphabetically, like ls -x.  */
 484       for (i = 1; matches[i]; i++)
 485         {
 486           temp = printable_part (matches[i]);
 487           printed_len = print_filename (temp, matches[i]);
 488           /* Have we reached the end of this line?  */
 489           if (matches[i+1])
 490             {
 491               if (i && (limit > 1) && (i % limit) == 0)
 492                 tui_putc ('\n');
 493               else
 494                 for (k = 0; k < max - printed_len; k++)
 495                   tui_putc (' ');
 496             }
 497         }
 498       tui_putc ('\n');
 499     }
 500 }
 501
 502 /* Setup the IO for curses or non-curses mode.
 503    - In non-curses mode, readline and gdb use the standard input and
 504    standard output/error directly.
 505    - In curses mode, the standard output/error is controlled by TUI
 506    with the tui_stdout and tui_stderr.  The output is redirected in
 507    the curses command window.  Several readline callbacks are installed
 508    so that readline asks for its input to the curses command window
 509    with wgetch().  */
 510 void
 511 tui_setup_io (int mode)
 512 {
 513   extern int _rl_echoing_p;
 514
 515   if (mode)
 516     {
 517       /* Redirect readline to TUI.  */
 518       tui_old_rl_redisplay_function = rl_redisplay_function;
 519       tui_old_rl_deprep_terminal = rl_deprep_term_function;
 520       tui_old_rl_prep_terminal = rl_prep_term_function;
 521       tui_old_rl_getc_function = rl_getc_function;
 522       tui_old_rl_outstream = rl_outstream;
 523       tui_old_rl_echoing_p = _rl_echoing_p;
 524       rl_redisplay_function = tui_redisplay_readline;
 525       rl_deprep_term_function = tui_deprep_terminal;
 526       rl_prep_term_function = tui_prep_terminal;
 527       rl_getc_function = tui_getc;
 528       _rl_echoing_p = 0;
 529       rl_outstream = tui_rl_outstream;
 530       rl_prompt = 0;
 531       rl_completion_display_matches_hook = tui_rl_display_match_list;
 532       rl_already_prompted = 0;
 533
 534       /* Keep track of previous gdb output.  */
 535       tui_old_stdout = gdb_stdout;
 536       tui_old_stderr = gdb_stderr;
 537       tui_old_uiout = current_uiout;
 538
 539       /* Reconfigure gdb output.  */
 540       gdb_stdout = tui_stdout;
 541       gdb_stderr = tui_stderr;
 542       gdb_stdlog = gdb_stdout;  /* for moment */
 543       gdb_stdtarg = gdb_stderr; /* for moment */
 544       gdb_stdtargerr = gdb_stderr;      /* for moment */
 545       current_uiout = tui_out;
 546
 547       /* Save tty for SIGCONT.  */
 548       savetty ();
 549     }
 550   else
 551     {
 552       /* Restore gdb output.  */
 553       gdb_stdout = tui_old_stdout;
 554       gdb_stderr = tui_old_stderr;
 555       gdb_stdlog = gdb_stdout;  /* for moment */
 556       gdb_stdtarg = gdb_stderr; /* for moment */
 557       gdb_stdtargerr = gdb_stderr;      /* for moment */
 558       current_uiout = tui_old_uiout;
 559
 560       /* Restore readline.  */
 561       rl_redisplay_function = tui_old_rl_redisplay_function;
 562       rl_deprep_term_function = tui_old_rl_deprep_terminal;
 563       rl_prep_term_function = tui_old_rl_prep_terminal;
 564       rl_getc_function = tui_old_rl_getc_function;
 565       rl_outstream = tui_old_rl_outstream;
 566       rl_completion_display_matches_hook = 0;
 567       _rl_echoing_p = tui_old_rl_echoing_p;
 568       rl_already_prompted = 0;
 569
 570       /* Save tty for SIGCONT.  */
 571       savetty ();
 572     }
 573 }
 574
 575 #ifdef SIGCONT
 576 /* Catch SIGCONT to restore the terminal and refresh the screen.  */
 577 static void
 578 tui_cont_sig (int sig)
 579 {
 580   if (tui_active)
 581     {
 582       /* Restore the terminal setting because another process (shell)
 583          might have changed it.  */
 584       resetty ();
 585
 586       /* Force a refresh of the screen.  */
 587       tui_refresh_all_win ();
 588
 589       /* Update cursor position on the screen.  */
 590       wmove (TUI_CMD_WIN->generic.handle,
 591              TUI_CMD_WIN->detail.command_info.start_line,
 592              TUI_CMD_WIN->detail.command_info.curch);
 593       wrefresh (TUI_CMD_WIN->generic.handle);
 594     }
 595   signal (sig, tui_cont_sig);
 596 }
 597 #endif
 598
 599 /* Initialize the IO for gdb in curses mode.  */
 600 void
 601 tui_initialize_io (void)
 602 {
 603 #ifdef SIGCONT
 604   signal (SIGCONT, tui_cont_sig);
 605 #endif
 606
 607   /* Create tui output streams.  */
 608   tui_stdout = tui_fileopen (stdout);
 609   tui_stderr = tui_fileopen (stderr);
 610   tui_out = tui_out_new (tui_stdout);
 611
 612   /* Create the default UI.  */
 613   tui_old_uiout = cli_out_new (gdb_stdout);
 614
 615 #ifdef TUI_USE_PIPE_FOR_READLINE
 616   /* Temporary solution for readline writing to stdout: redirect
 617      readline output in a pipe, read that pipe and output the content
 618      in the curses command window.  */
 619   if (gdb_pipe_cloexec (tui_readline_pipe) != 0)
 620     {
 621       fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
 622       exit (1);
 623     }
 624   tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
 625   if (tui_rl_outstream == 0)
 626     {
 627       fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
 628       exit (1);
 629     }
 630   setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
 631
 632 #ifdef O_NONBLOCK
 633   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
 634 #else
 635 #ifdef O_NDELAY
 636   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
 637 #endif
 638 #endif
 639   add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
 640 #else
 641   tui_rl_outstream = stdout;
 642 #endif
 643 }
 644
 645 /* Get a character from the command window.  This is called from the
 646    readline package.  */
 647 int
 648 tui_getc (FILE *fp)
 649 {
 650   int ch;
 651   WINDOW *w;
 652
 653   w = TUI_CMD_WIN->generic.handle;
 654
 655 #ifdef TUI_USE_PIPE_FOR_READLINE
 656   /* Flush readline output.  */
 657   tui_readline_output (0, 0);
 658 #endif
 659
 660   ch = wgetch (w);
 661   ch = tui_handle_resize_during_io (ch);
 662
 663   /* The \n must be echoed because it will not be printed by
 664      readline.  */
 665   if (ch == '\n')
 666     {
 667       /* When hitting return with an empty input, gdb executes the last
 668          command.  If we emit a newline, this fills up the command window
 669          with empty lines with gdb prompt at beginning.  Instead of that,
 670          stay on the same line but provide a visual effect to show the
 671          user we recognized the command.  */
 672       if (rl_end == 0)
 673         {
 674           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
 675
 676           /* Clear the line.  This will blink the gdb prompt since
 677              it will be redrawn at the same line.  */
 678           wclrtoeol (w);
 679           wrefresh (w);
 680           napms (20);
 681         }
 682       else
 683         {
 684           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
 685                  TUI_CMD_WIN->detail.command_info.curch);
 686           waddch (w, ch);
 687         }
 688     }
 689
 690   if (key_is_command_char (ch))
 691     {                           /* Handle prev/next/up/down here.  */
 692       ch = tui_dispatch_ctrl_char (ch);
 693     }
 694
 695   if (ch == '\n' || ch == '\r' || ch == '\f')
 696     TUI_CMD_WIN->detail.command_info.curch = 0;
 697   if (ch == KEY_BACKSPACE)
 698     return '\b';
 699
 700   return ch;
 701 }
 702
 703
 704 /* Cleanup when a resize has occured.
 705    Returns the character that must be processed.  */
 706 static unsigned int
 707 tui_handle_resize_during_io (unsigned int original_ch)
 708 {
 709   if (tui_win_resized ())
 710     {
 711       tui_resize_all ();
 712       tui_refresh_all_win ();
 713       dont_repeat ();
 714       tui_set_win_resized_to (FALSE);
 715       return '\n';
 716     }
 717   else
 718     return original_ch;
 719 }