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
  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 #define TUI_USE_PIPE_FOR_READLINE
 117 /* #undef TUI_USE_PIPE_FOR_READLINE */
 118
 119 /* TUI output files.  */
 120 static struct ui_file *tui_stdout;
 121 static struct ui_file *tui_stderr;
 122 struct ui_out *tui_out;
 123
 124 /* GDB output files in non-curses mode.  */
 125 static struct ui_file *tui_old_stdout;
 126 static struct ui_file *tui_old_stderr;
 127 struct ui_out *tui_old_uiout;
 128
 129 /* Readline previous hooks.  */
 130 static Function *tui_old_rl_getc_function;
 131 static VFunction *tui_old_rl_redisplay_function;
 132 static VFunction *tui_old_rl_prep_terminal;
 133 static VFunction *tui_old_rl_deprep_terminal;
 134 static int tui_old_readline_echoing_p;
 135
 136 /* Readline output stream.
 137    Should be removed when readline is clean.  */
 138 static FILE *tui_rl_outstream;
 139 static FILE *tui_old_rl_outstream;
 140 #ifdef TUI_USE_PIPE_FOR_READLINE
 141 static int tui_readline_pipe[2];
 142 #endif
 143
 144 /* The last gdb prompt that was registered in readline.
 145    This may be the main gdb prompt or a secondary prompt.  */
 146 static char *tui_rl_saved_prompt;
 147
 148 static unsigned int tui_handle_resize_during_io (unsigned int);
 149
 150 static void
 151 tui_putc (char c)
 152 {
 153   char buf[2];
 154
 155   buf[0] = c;
 156   buf[1] = 0;
 157   tui_puts (buf);
 158 }
 159
 160 /* Print the string in the curses command window.  */
 161 void
 162 tui_puts (const char *string)
 163 {
 164   static int tui_skip_line = -1;
 165   char c;
 166   WINDOW *w;
 167
 168   w = TUI_CMD_WIN->generic.handle;
 169   while ((c = *string++) != 0)
 170     {
 171       /* Catch annotation and discard them.  We need two \032 and
 172          discard until a \n is seen.  */
 173       if (c == '\032')
 174         {
 175           tui_skip_line++;
 176         }
 177       else if (tui_skip_line != 1)
 178         {
 179           tui_skip_line = -1;
 180           waddch (w, c);
 181         }
 182       else if (c == '\n')
 183         tui_skip_line = -1;
 184     }
 185   getyx (w, TUI_CMD_WIN->detail.command_info.cur_line,
 186          TUI_CMD_WIN->detail.command_info.curch);
 187   TUI_CMD_WIN->detail.command_info.start_line = TUI_CMD_WIN->detail.command_info.cur_line;
 188
 189   /* We could defer the following.  */
 190   wrefresh (w);
 191   fflush (stdout);
 192 }
 193
 194 /* Readline callback.
 195    Redisplay the command line with its prompt after readline has
 196    changed the edited text.  */
 197 void
 198 tui_redisplay_readline (void)
 199 {
 200   int prev_col;
 201   int height;
 202   int col, line;
 203   int c_pos;
 204   int c_line;
 205   int in;
 206   WINDOW *w;
 207   char *prompt;
 208   int start_line;
 209
 210   /* Detect when we temporarily left SingleKey and now the readline
 211      edit buffer is empty, automatically restore the SingleKey
 212      mode.  */
 213   if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0)
 214     tui_set_key_mode (TUI_SINGLE_KEY_MODE);
 215
 216   if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
 217     prompt = "";
 218   else
 219     prompt = tui_rl_saved_prompt;
 220
 221   c_pos = -1;
 222   c_line = -1;
 223   w = TUI_CMD_WIN->generic.handle;
 224   start_line = TUI_CMD_WIN->detail.command_info.start_line;
 225   wmove (w, start_line, 0);
 226   prev_col = 0;
 227   height = 1;
 228   for (in = 0; prompt && prompt[in]; in++)
 229     {
 230       waddch (w, prompt[in]);
 231       getyx (w, line, col);
 232       if (col < prev_col)
 233         height++;
 234       prev_col = col;
 235     }
 236   for (in = 0; in < rl_end; in++)
 237     {
 238       unsigned char c;
 239
 240       c = (unsigned char) rl_line_buffer[in];
 241       if (in == rl_point)
 242         {
 243           getyx (w, c_line, c_pos);
 244         }
 245
 246       if (CTRL_CHAR (c) || c == RUBOUT)
 247         {
 248           waddch (w, '^');
 249           waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
 250         }
 251       else
 252         {
 253           waddch (w, c);
 254         }
 255       if (c == '\n')
 256         {
 257           getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 258                  TUI_CMD_WIN->detail.command_info.curch);
 259         }
 260       getyx (w, line, col);
 261       if (col < prev_col)
 262         height++;
 263       prev_col = col;
 264     }
 265   wclrtobot (w);
 266   getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
 267          TUI_CMD_WIN->detail.command_info.curch);
 268   if (c_line >= 0)
 269     {
 270       wmove (w, c_line, c_pos);
 271       TUI_CMD_WIN->detail.command_info.cur_line = c_line;
 272       TUI_CMD_WIN->detail.command_info.curch = c_pos;
 273     }
 274   TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
 275
 276   wrefresh (w);
 277   fflush(stdout);
 278 }
 279
 280 /* Readline callback to prepare the terminal.  It is called once each
 281    time we enter readline.  Terminal is already setup in curses
 282    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 each
 294    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
 338    we are using it, check for and output a single character for
 339    `special' filenames.  Return the number of characters we
 340    output.  */
 341
 342 #define PUTX(c) \
 343     do { \
 344       if (CTRL_CHAR (c)) \
 345         { \
 346           tui_puts ("^"); \
 347           tui_putc (UNCTRL (c)); \
 348           printed_len += 2; \
 349         } \
 350       else if (c == RUBOUT) \
 351         { \
 352           tui_puts ("^?"); \
 353           printed_len += 2; \
 354         } \
 355       else \
 356         { \
 357           tui_putc (c); \
 358           printed_len++; \
 359         } \
 360     } while (0)
 361
 362 static int
 363 print_filename (char *to_print, char *full_pathname)
 364 {
 365   int printed_len = 0;
 366   char *s;
 367
 368   for (s = to_print; *s; s++)
 369     {
 370       PUTX (*s);
 371     }
 372   return printed_len;
 373 }
 374
 375 /* The user must press "y" or "n".  Non-zero return means "y" pressed.
 376    Comes from readline/complete.c.  */
 377 static int
 378 get_y_or_n (void)
 379 {
 380   extern int _rl_abort_internal ();
 381   int c;
 382
 383   for (;;)
 384     {
 385       c = rl_read_key ();
 386       if (c == 'y' || c == 'Y' || c == ' ')
 387         return (1);
 388       if (c == 'n' || c == 'N' || c == RUBOUT)
 389         return (0);
 390       if (c == ABORT_CHAR)
 391         _rl_abort_internal ();
 392       beep ();
 393     }
 394 }
 395
 396 /* A convenience function for displaying a list of strings in
 397    columnar format on readline's output stream.  MATCHES is the list
 398    of strings, in argv format, LEN is the number of strings in MATCHES,
 399    and MAX is the length of the longest string in MATCHES.
 400
 401    Comes from readline/complete.c and modified to write in
 402    the TUI command window using tui_putc/tui_puts.  */
 403 static void
 404 tui_rl_display_match_list (char **matches, int len, int max)
 405 {
 406   typedef int QSFUNC (const void *, const void *);
 407   extern int _rl_qsort_string_compare (const void*, const void*);
 408   extern int _rl_print_completions_horizontally;
 409
 410   int count, limit, printed_len;
 411   int i, j, k, l;
 412   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       sprintf (msg, "\nDisplay all %d possibilities? (y or n)", len);
 424       tui_puts (msg);
 425       if (get_y_or_n () == 0)
 426         {
 427           tui_puts ("\n");
 428           return;
 429         }
 430     }
 431
 432   /* How many items of MAX length can we fit in the screen window?  */
 433   max += 2;
 434   limit = screenwidth / max;
 435   if (limit != 1 && (limit * max == screenwidth))
 436     limit--;
 437
 438   /* Avoid a possible floating exception.  If max > screenwidth, limit
 439      will be 0 and a divide-by-zero fault will result.  */
 440   if (limit == 0)
 441     limit = 1;
 442
 443   /* How many iterations of the printing loop?  */
 444   count = (len + (limit - 1)) / limit;
 445
 446   /* Watch out for special case.  If LEN is less than LIMIT, then
 447      just do the inner printing loop.
 448            0 < len <= limit  implies  count = 1.  */
 449
 450   /* Sort the items if they are not already sorted.  */
 451   if (rl_ignore_completion_duplicates == 0)
 452     qsort (matches + 1, len, sizeof (char *),
 453            (QSFUNC *)_rl_qsort_string_compare);
 454
 455   tui_putc ('\n');
 456
 457   if (_rl_print_completions_horizontally == 0)
 458     {
 459       /* Print the sorted items, up-and-down alphabetically, like ls.  */
 460       for (i = 1; i <= count; i++)
 461         {
 462           for (j = 0, l = i; j < limit; j++)
 463             {
 464               if (l > len || matches[l] == 0)
 465                 break;
 466               else
 467                 {
 468                   temp = printable_part (matches[l]);
 469                   printed_len = print_filename (temp, matches[l]);
 470
 471                   if (j + 1 < limit)
 472                     for (k = 0; k < max - printed_len; k++)
 473                       tui_putc (' ');
 474                 }
 475               l += count;
 476             }
 477           tui_putc ('\n');
 478         }
 479     }
 480   else
 481     {
 482       /* Print the sorted items, across alphabetically, like ls -x.  */
 483       for (i = 1; matches[i]; i++)
 484         {
 485           temp = printable_part (matches[i]);
 486           printed_len = print_filename (temp, matches[i]);
 487           /* Have we reached the end of this line?  */
 488           if (matches[i+1])
 489             {
 490               if (i && (limit > 1) && (i % limit) == 0)
 491                 tui_putc ('\n');
 492               else
 493                 for (k = 0; k < max - printed_len; k++)
 494                   tui_putc (' ');
 495             }
 496         }
 497       tui_putc ('\n');
 498     }
 499 }
 500
 501 /* Setup the IO for curses or non-curses mode.
 502    - In non-curses mode, readline and gdb use the standard input and
 503    standard output/error directly.
 504    - In curses mode, the standard output/error is controlled by TUI
 505    with the tui_stdout and tui_stderr.  The output is redirected in
 506    the curses command window.  Several readline callbacks are installed
 507    so that readline asks for its input to the curses command window
 508    with wgetch().  */
 509 void
 510 tui_setup_io (int mode)
 511 {
 512   extern int readline_echoing_p;
 513
 514   if (mode)
 515     {
 516       /* Redirect readline to TUI.  */
 517       tui_old_rl_redisplay_function = rl_redisplay_function;
 518       tui_old_rl_deprep_terminal = rl_deprep_term_function;
 519       tui_old_rl_prep_terminal = rl_prep_term_function;
 520       tui_old_rl_getc_function = rl_getc_function;
 521       tui_old_rl_outstream = rl_outstream;
 522       tui_old_readline_echoing_p = readline_echoing_p;
 523       rl_redisplay_function = tui_redisplay_readline;
 524       rl_deprep_term_function = tui_deprep_terminal;
 525       rl_prep_term_function = tui_prep_terminal;
 526       rl_getc_function = tui_getc;
 527       readline_echoing_p = 0;
 528       rl_outstream = tui_rl_outstream;
 529       rl_prompt = 0;
 530       rl_completion_display_matches_hook = tui_rl_display_match_list;
 531       rl_already_prompted = 0;
 532
 533       /* Keep track of previous gdb output.  */
 534       tui_old_stdout = gdb_stdout;
 535       tui_old_stderr = gdb_stderr;
 536       tui_old_uiout = uiout;
 537
 538       /* Reconfigure gdb output.  */
 539       gdb_stdout = tui_stdout;
 540       gdb_stderr = tui_stderr;
 541       gdb_stdlog = gdb_stdout;  /* for moment */
 542       gdb_stdtarg = gdb_stderr; /* for moment */
 543       uiout = tui_out;
 544
 545       /* Save tty for SIGCONT.  */
 546       savetty ();
 547     }
 548   else
 549     {
 550       /* Restore gdb output.  */
 551       gdb_stdout = tui_old_stdout;
 552       gdb_stderr = tui_old_stderr;
 553       gdb_stdlog = gdb_stdout;  /* for moment */
 554       gdb_stdtarg = gdb_stderr; /* for moment */
 555       uiout = tui_old_uiout;
 556
 557       /* Restore readline.  */
 558       rl_redisplay_function = tui_old_rl_redisplay_function;
 559       rl_deprep_term_function = tui_old_rl_deprep_terminal;
 560       rl_prep_term_function = tui_old_rl_prep_terminal;
 561       rl_getc_function = tui_old_rl_getc_function;
 562       rl_outstream = tui_old_rl_outstream;
 563       rl_completion_display_matches_hook = 0;
 564       readline_echoing_p = tui_old_readline_echoing_p;
 565       rl_already_prompted = 0;
 566
 567       /* Save tty for SIGCONT.  */
 568       savetty ();
 569     }
 570 }
 571
 572 #ifdef SIGCONT
 573 /* Catch SIGCONT to restore the terminal and refresh the screen.  */
 574 static void
 575 tui_cont_sig (int sig)
 576 {
 577   if (tui_active)
 578     {
 579       /* Restore the terminal setting because another process (shell)
 580          might have changed it.  */
 581       resetty ();
 582
 583       /* Force a refresh of the screen.  */
 584       tui_refresh_all_win ();
 585
 586       /* Update cursor position on the screen.  */
 587       wmove (TUI_CMD_WIN->generic.handle,
 588              TUI_CMD_WIN->detail.command_info.start_line,
 589              TUI_CMD_WIN->detail.command_info.curch);
 590       wrefresh (TUI_CMD_WIN->generic.handle);
 591     }
 592   signal (sig, tui_cont_sig);
 593 }
 594 #endif
 595
 596 /* Initialize the IO for gdb in curses mode.  */
 597 void
 598 tui_initialize_io (void)
 599 {
 600 #ifdef SIGCONT
 601   signal (SIGCONT, tui_cont_sig);
 602 #endif
 603
 604   /* Create tui output streams.  */
 605   tui_stdout = tui_fileopen (stdout);
 606   tui_stderr = tui_fileopen (stderr);
 607   tui_out = tui_out_new (tui_stdout);
 608
 609   /* Create the default UI.  It is not created because we installed a
 610      deprecated_init_ui_hook.  */
 611   tui_old_uiout = uiout = cli_out_new (gdb_stdout);
 612
 613 #ifdef TUI_USE_PIPE_FOR_READLINE
 614   /* Temporary solution for readline writing to stdout: redirect
 615      readline output in a pipe, read that pipe and output the content
 616      in the curses command window.  */
 617   if (pipe (tui_readline_pipe) != 0)
 618     {
 619       fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
 620       exit (1);
 621     }
 622   tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
 623   if (tui_rl_outstream == 0)
 624     {
 625       fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
 626       exit (1);
 627     }
 628   setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
 629
 630 #ifdef O_NONBLOCK
 631   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
 632 #else
 633 #ifdef O_NDELAY
 634   (void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
 635 #endif
 636 #endif
 637   add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
 638 #else
 639   tui_rl_outstream = stdout;
 640 #endif
 641 }
 642
 643 /* Get a character from the command window.  This is called from the
 644    readline package.  */
 645 int
 646 tui_getc (FILE *fp)
 647 {
 648   int ch;
 649   WINDOW *w;
 650
 651   w = TUI_CMD_WIN->generic.handle;
 652
 653 #ifdef TUI_USE_PIPE_FOR_READLINE
 654   /* Flush readline output.  */
 655   tui_readline_output (GDB_READABLE, 0);
 656 #endif
 657
 658   ch = wgetch (w);
 659   ch = tui_handle_resize_during_io (ch);
 660
 661   /* The \n must be echoed because it will not be printed by
 662      readline.  */
 663   if (ch == '\n')
 664     {
 665       /* When hitting return with an empty input, gdb executes the last
 666          command.  If we emit a newline, this fills up the command window
 667          with empty lines with gdb prompt at beginning.  Instead of that,
 668          stay on the same line but provide a visual effect to show the
 669          user we recognized the command.  */
 670       if (rl_end == 0)
 671         {
 672           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
 673
 674           /* Clear the line.  This will blink the gdb prompt since
 675              it will be redrawn at the same line.  */
 676           wclrtoeol (w);
 677           wrefresh (w);
 678           napms (20);
 679         }
 680       else
 681         {
 682           wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
 683                  TUI_CMD_WIN->detail.command_info.curch);
 684           waddch (w, ch);
 685         }
 686     }
 687
 688   if (key_is_command_char (ch))
 689     {                           /* Handle prev/next/up/down here.  */
 690       ch = tui_dispatch_ctrl_char (ch);
 691     }
 692
 693   if (ch == '\n' || ch == '\r' || ch == '\f')
 694     TUI_CMD_WIN->detail.command_info.curch = 0;
 695   if (ch == KEY_BACKSPACE)
 696     return '\b';
 697
 698   return ch;
 699 }
 700
 701
 702 /* Cleanup when a resize has occured.
 703    Returns the character that must be processed.  */
 704 static unsigned int
 705 tui_handle_resize_during_io (unsigned int original_ch)
 706 {
 707   if (tui_win_resized ())
 708     {
 709       tui_refresh_all_win ();
 710       dont_repeat ();
 711       tui_set_win_resized_to (FALSE);
 712       return '\n';
 713     }
 714   else
 715     return original_ch;
 716 }