release/src/router/libncurses/ncurses/base/lib_getch.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
   3  *                                                                          *
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   5  * copy of this software and associated documentation files (the            *
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  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
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  26  * authorization.                                                           *
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  *     and: Juergen Pfeifer                         2009                    *
  34  ****************************************************************************/
  35
  36 /*
  37 **      lib_getch.c
  38 **
  39 **      The routine getch().
  40 **
  41 */
  42
  43 #include <curses.priv.h>
  44
  45 MODULE_ID("$Id: lib_getch.c,v 1.121 2010/12/25 23:24:04 tom Exp $")
  46
  47 #include <fifo_defs.h>
  48
  49 #if USE_REENTRANT
  50 #define GetEscdelay(sp) *_nc_ptr_Escdelay(sp)
  51 NCURSES_EXPORT(int)
  52 NCURSES_PUBLIC_VAR(ESCDELAY) (void)
  53 {
  54     return *(_nc_ptr_Escdelay(CURRENT_SCREEN));
  55 }
  56
  57 NCURSES_EXPORT(int *)
  58 _nc_ptr_Escdelay(SCREEN *sp)
  59 {
  60     return ptrEscdelay(sp);
  61 }
  62 #else
  63 #define GetEscdelay(sp) ESCDELAY
  64 NCURSES_EXPORT_VAR(int) ESCDELAY = 1000;
  65 #endif
  66
  67 #if NCURSES_EXT_FUNCS
  68 NCURSES_EXPORT(int)
  69 NCURSES_SP_NAME(set_escdelay) (NCURSES_SP_DCLx int value)
  70 {
  71     int code = OK;
  72 #if USE_REENTRANT
  73     if (SP_PARM) {
  74         SET_ESCDELAY(value);
  75     } else {
  76         code = ERR;
  77     }
  78 #else
  79     (void) SP_PARM;
  80     ESCDELAY = value;
  81 #endif
  82     return code;
  83 }
  84
  85 #if NCURSES_SP_FUNCS
  86 NCURSES_EXPORT(int)
  87 set_escdelay(int value)
  88 {
  89     int code;
  90 #if USE_REENTRANT
  91     code = NCURSES_SP_NAME(set_escdelay) (CURRENT_SCREEN, value);
  92 #else
  93     ESCDELAY = value;
  94     code = OK;
  95 #endif
  96     return code;
  97 }
  98 #endif
  99 #endif /* NCURSES_EXT_FUNCS */
 100
 101 #if NCURSES_EXT_FUNCS
 102 NCURSES_EXPORT(int)
 103 NCURSES_SP_NAME(get_escdelay) (NCURSES_SP_DCL0)
 104 {
 105 #if !USE_REENTRANT
 106     (void) SP_PARM;
 107 #endif
 108     return GetEscdelay(SP_PARM);
 109 }
 110
 111 #if NCURSES_SP_FUNCS
 112 NCURSES_EXPORT(int)
 113 get_escdelay(void)
 114 {
 115     return NCURSES_SP_NAME(get_escdelay) (CURRENT_SCREEN);
 116 }
 117 #endif
 118 #endif /* NCURSES_EXT_FUNCS */
 119
 120 static int
 121 _nc_use_meta(WINDOW *win)
 122 {
 123     SCREEN *sp = _nc_screen_of(win);
 124     return (sp ? sp->_use_meta : 0);
 125 }
 126
 127 /*
 128  * Check for mouse activity, returning nonzero if we find any.
 129  */
 130 static int
 131 check_mouse_activity(SCREEN *sp, int delay EVENTLIST_2nd(_nc_eventlist * evl))
 132 {
 133     int rc;
 134
 135 #ifdef USE_TERM_DRIVER
 136     rc = TCBOf(sp)->drv->testmouse(TCBOf(sp), delay);
 137 #else
 138 #if USE_SYSMOUSE
 139     if ((sp->_mouse_type == M_SYSMOUSE)
 140         && (sp->_sysmouse_head < sp->_sysmouse_tail)) {
 141         rc = TW_MOUSE;
 142     } else
 143 #endif
 144     {
 145         rc = _nc_timed_wait(sp,
 146                             TWAIT_MASK,
 147                             delay,
 148                             (int *) 0
 149                             EVENTLIST_2nd(evl));
 150 #if USE_SYSMOUSE
 151         if ((sp->_mouse_type == M_SYSMOUSE)
 152             && (sp->_sysmouse_head < sp->_sysmouse_tail)
 153             && (rc == 0)
 154             && (errno == EINTR)) {
 155             rc |= TW_MOUSE;
 156         }
 157 #endif
 158     }
 159 #endif
 160     return rc;
 161 }
 162
 163 static NCURSES_INLINE int
 164 fifo_peek(SCREEN *sp)
 165 {
 166     int ch = sp->_fifo[peek];
 167     TR(TRACE_IEVENT, ("peeking at %d", peek));
 168
 169     p_inc();
 170     return ch;
 171 }
 172
 173 static NCURSES_INLINE int
 174 fifo_pull(SCREEN *sp)
 175 {
 176     int ch;
 177     ch = sp->_fifo[head];
 178     TR(TRACE_IEVENT, ("pulling %s from %d", _nc_tracechar(sp, ch), head));
 179
 180     if (peek == head) {
 181         h_inc();
 182         peek = head;
 183     } else
 184         h_inc();
 185
 186 #ifdef TRACE
 187     if (USE_TRACEF(TRACE_IEVENT)) {
 188         _nc_fifo_dump(sp);
 189         _nc_unlock_global(tracef);
 190     }
 191 #endif
 192     return ch;
 193 }
 194
 195 static NCURSES_INLINE int
 196 fifo_push(SCREEN *sp EVENTLIST_2nd(_nc_eventlist * evl))
 197 {
 198     int n;
 199     int ch = 0;
 200     int mask = 0;
 201
 202     (void) mask;
 203     if (tail == -1)
 204         return ERR;
 205
 206 #ifdef HIDE_EINTR
 207   again:
 208     errno = 0;
 209 #endif
 210
 211 #ifdef NCURSES_WGETCH_EVENTS
 212     if (evl
 213 #if USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
 214         || (sp->_mouse_fd >= 0)
 215 #endif
 216         ) {
 217         mask = check_mouse_activity(sp, -1 EVENTLIST_2nd(evl));
 218     } else
 219         mask = 0;
 220
 221     if (mask & TW_EVENT) {
 222         T(("fifo_push: ungetch KEY_EVENT"));
 223         safe_ungetch(sp, KEY_EVENT);
 224         return KEY_EVENT;
 225     }
 226 #elif USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
 227     if (sp->_mouse_fd >= 0) {
 228         mask = check_mouse_activity(sp, -1 EVENTLIST_2nd(evl));
 229     }
 230 #endif
 231
 232 #if USE_GPM_SUPPORT || USE_EMX_MOUSE
 233     if ((sp->_mouse_fd >= 0) && (mask & TW_MOUSE)) {
 234         sp->_mouse_event(sp);
 235         ch = KEY_MOUSE;
 236         n = 1;
 237     } else
 238 #endif
 239 #if USE_SYSMOUSE
 240         if ((sp->_mouse_type == M_SYSMOUSE)
 241             && (sp->_sysmouse_head < sp->_sysmouse_tail)) {
 242         sp->_mouse_event(sp);
 243         ch = KEY_MOUSE;
 244         n = 1;
 245     } else if ((sp->_mouse_type == M_SYSMOUSE)
 246                && (mask <= 0) && errno == EINTR) {
 247         sp->_mouse_event(sp);
 248         ch = KEY_MOUSE;
 249         n = 1;
 250     } else
 251 #endif
 252 #ifdef USE_TERM_DRIVER
 253         if ((sp->_mouse_type == M_TERM_DRIVER)
 254             && (sp->_drv_mouse_head < sp->_drv_mouse_tail)) {
 255         sp->_mouse_event(sp);
 256         ch = KEY_MOUSE;
 257         n = 1;
 258     } else
 259 #endif
 260     {                           /* Can block... */
 261 #ifdef USE_TERM_DRIVER
 262         int buf;
 263         n = CallDriver_1(sp, read, &buf);
 264         ch = buf;
 265 #else
 266         unsigned char c2 = 0;
 267 # if USE_PTHREADS_EINTR
 268 #  if USE_WEAK_SYMBOLS
 269         if ((pthread_self) && (pthread_kill) && (pthread_equal))
 270 #  endif
 271             _nc_globals.read_thread = pthread_self();
 272 # endif
 273         n = (int) read(sp->_ifd, &c2, 1);
 274 #if USE_PTHREADS_EINTR
 275         _nc_globals.read_thread = 0;
 276 #endif
 277         ch = c2;
 278 #endif
 279     }
 280
 281 #ifdef HIDE_EINTR
 282     /*
 283      * Under System V curses with non-restarting signals, getch() returns
 284      * with value ERR when a handled signal keeps it from completing.
 285      * If signals restart system calls, OTOH, the signal is invisible
 286      * except to its handler.
 287      *
 288      * We don't want this difference to show.  This piece of code
 289      * tries to make it look like we always have restarting signals.
 290      */
 291     if (n <= 0 && errno == EINTR
 292 # if USE_PTHREADS_EINTR
 293         && (_nc_globals.have_sigwinch == 0)
 294 # endif
 295         )
 296         goto again;
 297 #endif
 298
 299     if ((n == -1) || (n == 0)) {
 300         TR(TRACE_IEVENT, ("read(%d,&ch,1)=%d, errno=%d", sp->_ifd, n, errno));
 301         ch = ERR;
 302     }
 303     TR(TRACE_IEVENT, ("read %d characters", n));
 304
 305     sp->_fifo[tail] = ch;
 306     sp->_fifohold = 0;
 307     if (head == -1)
 308         head = peek = tail;
 309     t_inc();
 310     TR(TRACE_IEVENT, ("pushed %s at %d", _nc_tracechar(sp, ch), tail));
 311 #ifdef TRACE
 312     if (USE_TRACEF(TRACE_IEVENT)) {
 313         _nc_fifo_dump(sp);
 314         _nc_unlock_global(tracef);
 315     }
 316 #endif
 317     return ch;
 318 }
 319
 320 static NCURSES_INLINE void
 321 fifo_clear(SCREEN *sp)
 322 {
 323     memset(sp->_fifo, 0, sizeof(sp->_fifo));
 324     head = -1;
 325     tail = peek = 0;
 326 }
 327
 328 static int kgetch(SCREEN *EVENTLIST_2nd(_nc_eventlist * evl));
 329
 330 static void
 331 recur_wrefresh(WINDOW *win)
 332 {
 333 #ifdef USE_PTHREADS
 334     SCREEN *sp = _nc_screen_of(win);
 335     if (_nc_use_pthreads && sp != CURRENT_SCREEN) {
 336         SCREEN *save_SP;
 337
 338         /* temporarily switch to the window's screen to check/refresh */
 339         _nc_lock_global(curses);
 340         save_SP = CURRENT_SCREEN;
 341         _nc_set_screen(sp);
 342         recur_wrefresh(win);
 343         _nc_set_screen(save_SP);
 344         _nc_unlock_global(curses);
 345     } else
 346 #endif
 347         if ((is_wintouched(win) || (win->_flags & _HASMOVED))
 348             && !(win->_flags & _ISPAD)) {
 349         wrefresh(win);
 350     }
 351 }
 352
 353 static int
 354 recur_wgetnstr(WINDOW *win, char *buf)
 355 {
 356     SCREEN *sp = _nc_screen_of(win);
 357     int rc;
 358
 359     if (sp != 0) {
 360 #ifdef USE_PTHREADS
 361         if (_nc_use_pthreads && sp != CURRENT_SCREEN) {
 362             SCREEN *save_SP;
 363
 364             /* temporarily switch to the window's screen to get cooked input */
 365             _nc_lock_global(curses);
 366             save_SP = CURRENT_SCREEN;
 367             _nc_set_screen(sp);
 368             rc = recur_wgetnstr(win, buf);
 369             _nc_set_screen(save_SP);
 370             _nc_unlock_global(curses);
 371         } else
 372 #endif
 373         {
 374             sp->_called_wgetch = TRUE;
 375             rc = wgetnstr(win, buf, MAXCOLUMNS);
 376             sp->_called_wgetch = FALSE;
 377         }
 378     } else {
 379         rc = ERR;
 380     }
 381     return rc;
 382 }
 383
 384 NCURSES_EXPORT(int)
 385 _nc_wgetch(WINDOW *win,
 386            int *result,
 387            int use_meta
 388            EVENTLIST_2nd(_nc_eventlist * evl))
 389 {
 390     SCREEN *sp;
 391     int ch;
 392     int rc = 0;
 393 #ifdef NCURSES_WGETCH_EVENTS
 394     long event_delay = -1;
 395 #endif
 396
 397     T((T_CALLED("_nc_wgetch(%p)"), (void *) win));
 398
 399     *result = 0;
 400
 401     sp = _nc_screen_of(win);
 402     if (win == 0 || sp == 0) {
 403         returnCode(ERR);
 404     }
 405
 406     if (cooked_key_in_fifo()) {
 407         recur_wrefresh(win);
 408         *result = fifo_pull(sp);
 409         returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 410     }
 411 #ifdef NCURSES_WGETCH_EVENTS
 412     if (evl && (evl->count == 0))
 413         evl = NULL;
 414     event_delay = _nc_eventlist_timeout(evl);
 415 #endif
 416
 417     /*
 418      * Handle cooked mode.  Grab a string from the screen,
 419      * stuff its contents in the FIFO queue, and pop off
 420      * the first character to return it.
 421      */
 422     if (head == -1 &&
 423         !sp->_notty &&
 424         !sp->_raw &&
 425         !sp->_cbreak &&
 426         !sp->_called_wgetch) {
 427         char buf[MAXCOLUMNS], *bufp;
 428
 429         TR(TRACE_IEVENT, ("filling queue in cooked mode"));
 430
 431         /* ungetch in reverse order */
 432 #ifdef NCURSES_WGETCH_EVENTS
 433         rc = recur_wgetnstr(win, buf);
 434         if (rc != KEY_EVENT)
 435             safe_ungetch(sp, '\n');
 436 #else
 437         (void) recur_wgetnstr(win, buf);
 438         safe_ungetch(sp, '\n');
 439 #endif
 440         for (bufp = buf + strlen(buf); bufp > buf; bufp--)
 441             safe_ungetch(sp, bufp[-1]);
 442
 443 #ifdef NCURSES_WGETCH_EVENTS
 444         /* Return it first */
 445         if (rc == KEY_EVENT) {
 446             *result = rc;
 447         } else
 448 #endif
 449             *result = fifo_pull(sp);
 450         returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 451     }
 452
 453     if (win->_use_keypad != sp->_keypad_on)
 454         _nc_keypad(sp, win->_use_keypad);
 455
 456     recur_wrefresh(win);
 457
 458     if (win->_notimeout || (win->_delay >= 0) || (sp->_cbreak > 1)) {
 459         if (head == -1) {       /* fifo is empty */
 460             int delay;
 461
 462             TR(TRACE_IEVENT, ("timed delay in wgetch()"));
 463             if (sp->_cbreak > 1)
 464                 delay = (sp->_cbreak - 1) * 100;
 465             else
 466                 delay = win->_delay;
 467
 468 #ifdef NCURSES_WGETCH_EVENTS
 469             if (event_delay >= 0 && delay > event_delay)
 470                 delay = event_delay;
 471 #endif
 472
 473             TR(TRACE_IEVENT, ("delay is %d milliseconds", delay));
 474
 475             rc = check_mouse_activity(sp, delay EVENTLIST_2nd(evl));
 476
 477 #ifdef NCURSES_WGETCH_EVENTS
 478             if (rc & TW_EVENT) {
 479                 *result = KEY_EVENT;
 480                 returnCode(KEY_CODE_YES);
 481             }
 482 #endif
 483             if (!rc) {
 484                 goto check_sigwinch;
 485             }
 486         }
 487         /* else go on to read data available */
 488     }
 489
 490     if (win->_use_keypad) {
 491         /*
 492          * This is tricky.  We only want to get special-key
 493          * events one at a time.  But we want to accumulate
 494          * mouse events until either (a) the mouse logic tells
 495          * us it's picked up a complete gesture, or (b)
 496          * there's a detectable time lapse after one.
 497          *
 498          * Note: if the mouse code starts failing to compose
 499          * press/release events into clicks, you should probably
 500          * increase the wait with mouseinterval().
 501          */
 502         int runcount = 0;
 503
 504         do {
 505             ch = kgetch(sp EVENTLIST_2nd(evl));
 506             if (ch == KEY_MOUSE) {
 507                 ++runcount;
 508                 if (sp->_mouse_inline(sp))
 509                     break;
 510             }
 511             if (sp->_maxclick < 0)
 512                 break;
 513         } while
 514             (ch == KEY_MOUSE
 515              && (((rc = check_mouse_activity(sp, sp->_maxclick
 516                                              EVENTLIST_2nd(evl))) != 0
 517                   && !(rc & TW_EVENT))
 518                  || !sp->_mouse_parse(sp, runcount)));
 519 #ifdef NCURSES_WGETCH_EVENTS
 520         if ((rc & TW_EVENT) && !(ch == KEY_EVENT)) {
 521             safe_ungetch(sp, ch);
 522             ch = KEY_EVENT;
 523         }
 524 #endif
 525         if (runcount > 0 && ch != KEY_MOUSE) {
 526 #ifdef NCURSES_WGETCH_EVENTS
 527             /* mouse event sequence ended by an event, report event */
 528             if (ch == KEY_EVENT) {
 529                 safe_ungetch(sp, KEY_MOUSE);    /* FIXME This interrupts a gesture... */
 530             } else
 531 #endif
 532             {
 533                 /* mouse event sequence ended by keystroke, store keystroke */
 534                 safe_ungetch(sp, ch);
 535                 ch = KEY_MOUSE;
 536             }
 537         }
 538     } else {
 539         if (head == -1)
 540             fifo_push(sp EVENTLIST_2nd(evl));
 541         ch = fifo_pull(sp);
 542     }
 543
 544     if (ch == ERR) {
 545       check_sigwinch:
 546 #if USE_SIZECHANGE
 547         if (_nc_handle_sigwinch(sp)) {
 548             _nc_update_screensize(sp);
 549             /* resizeterm can push KEY_RESIZE */
 550             if (cooked_key_in_fifo()) {
 551                 *result = fifo_pull(sp);
 552                 /*
 553                  * Get the ERR from queue -- it is from WINCH,
 554                  * so we should take it out, the "error" is handled.
 555                  */
 556                 if (fifo_peek(sp) == -1)
 557                     fifo_pull(sp);
 558                 returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 559             }
 560         }
 561 #endif
 562         returnCode(ERR);
 563     }
 564
 565     /*
 566      * If echo() is in effect, display the printable version of the
 567      * key on the screen.  Carriage return and backspace are treated
 568      * specially by Solaris curses:
 569      *
 570      * If carriage return is defined as a function key in the
 571      * terminfo, e.g., kent, then Solaris may return either ^J (or ^M
 572      * if nonl() is set) or KEY_ENTER depending on the echo() mode.
 573      * We echo before translating carriage return based on nonl(),
 574      * since the visual result simply moves the cursor to column 0.
 575      *
 576      * Backspace is a different matter.  Solaris curses does not
 577      * translate it to KEY_BACKSPACE if kbs=^H.  This does not depend
 578      * on the stty modes, but appears to be a hardcoded special case.
 579      * This is a difference from ncurses, which uses the terminfo entry.
 580      * However, we provide the same visual result as Solaris, moving the
 581      * cursor to the left.
 582      */
 583     if (sp->_echo && !(win->_flags & _ISPAD)) {
 584         chtype backup = (chtype) ((ch == KEY_BACKSPACE) ? '\b' : ch);
 585         if (backup < KEY_MIN)
 586             wechochar(win, backup);
 587     }
 588
 589     /*
 590      * Simulate ICRNL mode
 591      */
 592     if ((ch == '\r') && sp->_nl)
 593         ch = '\n';
 594
 595     /* Strip 8th-bit if so desired.  We do this only for characters that
 596      * are in the range 128-255, to provide compatibility with terminals
 597      * that display only 7-bit characters.  Note that 'ch' may be a
 598      * function key at this point, so we mustn't strip _those_.
 599      */
 600     if (!use_meta)
 601         if ((ch < KEY_MIN) && (ch & 0x80))
 602             ch &= 0x7f;
 603
 604     T(("wgetch returning : %s", _nc_tracechar(sp, ch)));
 605
 606     *result = ch;
 607     returnCode(ch >= KEY_MIN ? KEY_CODE_YES : OK);
 608 }
 609
 610 #ifdef NCURSES_WGETCH_EVENTS
 611 NCURSES_EXPORT(int)
 612 wgetch_events(WINDOW *win, _nc_eventlist * evl)
 613 {
 614     int code;
 615     int value;
 616
 617     T((T_CALLED("wgetch_events(%p,%p)"), win, evl));
 618     code = _nc_wgetch(win,
 619                       &value,
 620                       _nc_use_meta(win)
 621                       EVENTLIST_2nd(evl));
 622     if (code != ERR)
 623         code = value;
 624     returnCode(code);
 625 }
 626 #endif
 627
 628 NCURSES_EXPORT(int)
 629 wgetch(WINDOW *win)
 630 {
 631     int code;
 632     int value;
 633
 634     T((T_CALLED("wgetch(%p)"), (void *) win));
 635     code = _nc_wgetch(win,
 636                       &value,
 637                       _nc_use_meta(win)
 638                       EVENTLIST_2nd((_nc_eventlist *) 0));
 639     if (code != ERR)
 640         code = value;
 641     returnCode(code);
 642 }
 643
 644 /*
 645 **      int
 646 **      kgetch()
 647 **
 648 **      Get an input character, but take care of keypad sequences, returning
 649 **      an appropriate code when one matches the input.  After each character
 650 **      is received, set an alarm call based on ESCDELAY.  If no more of the
 651 **      sequence is received by the time the alarm goes off, pass through
 652 **      the sequence gotten so far.
 653 **
 654 **      This function must be called when there are no cooked keys in queue.
 655 **      (that is head==-1 || peek==head)
 656 **
 657 */
 658
 659 static int
 660 kgetch(SCREEN *sp EVENTLIST_2nd(_nc_eventlist * evl))
 661 {
 662     TRIES *ptr;
 663     int ch = 0;
 664     int timeleft = GetEscdelay(sp);
 665
 666     TR(TRACE_IEVENT, ("kgetch() called"));
 667
 668     ptr = sp->_keytry;
 669
 670     for (;;) {
 671         if (cooked_key_in_fifo() && sp->_fifo[head] >= KEY_MIN) {
 672             break;
 673         } else if (!raw_key_in_fifo()) {
 674             ch = fifo_push(sp EVENTLIST_2nd(evl));
 675             if (ch == ERR) {
 676                 peek = head;    /* the keys stay uninterpreted */
 677                 return ERR;
 678             }
 679 #ifdef NCURSES_WGETCH_EVENTS
 680             else if (ch == KEY_EVENT) {
 681                 peek = head;    /* the keys stay uninterpreted */
 682                 return fifo_pull(sp);   /* Remove KEY_EVENT from the queue */
 683             }
 684 #endif
 685         }
 686
 687         ch = fifo_peek(sp);
 688         if (ch >= KEY_MIN) {
 689             /* If not first in queue, somebody put this key there on purpose in
 690              * emergency.  Consider it higher priority than the unfinished
 691              * keysequence we are parsing.
 692              */
 693             peek = head;
 694             /* assume the key is the last in fifo */
 695             t_dec();            /* remove the key */
 696             return ch;
 697         }
 698
 699         TR(TRACE_IEVENT, ("ch: %s", _nc_tracechar(sp, (unsigned char) ch)));
 700         while ((ptr != NULL) && (ptr->ch != (unsigned char) ch))
 701             ptr = ptr->sibling;
 702
 703         if (ptr == NULL) {
 704             TR(TRACE_IEVENT, ("ptr is null"));
 705             break;
 706         }
 707         TR(TRACE_IEVENT, ("ptr=%p, ch=%d, value=%d",
 708                           (void *) ptr, ptr->ch, ptr->value));
 709
 710         if (ptr->value != 0) {  /* sequence terminated */
 711             TR(TRACE_IEVENT, ("end of sequence"));
 712             if (peek == tail)
 713                 fifo_clear(sp);
 714             else
 715                 head = peek;
 716             return (ptr->value);
 717         }
 718
 719         ptr = ptr->child;
 720
 721         if (!raw_key_in_fifo()) {
 722             int rc;
 723
 724             TR(TRACE_IEVENT, ("waiting for rest of sequence"));
 725             rc = check_mouse_activity(sp, timeleft EVENTLIST_2nd(evl));
 726 #ifdef NCURSES_WGETCH_EVENTS
 727             if (rc & TW_EVENT) {
 728                 TR(TRACE_IEVENT, ("interrupted by a user event"));
 729                 /* FIXME Should have preserved remainder timeleft for reuse... */
 730                 peek = head;    /* Restart interpreting later */
 731                 return KEY_EVENT;
 732             }
 733 #endif
 734             if (!rc) {
 735                 TR(TRACE_IEVENT, ("ran out of time"));
 736                 break;
 737             }
 738         }
 739     }
 740     ch = fifo_pull(sp);
 741     peek = head;
 742     return ch;
 743 }