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

   1 /****************************************************************************
   2  * Copyright (c) 1998-2014,2015 Free Software Foundation, Inc.              *
   3  *                                                                          *
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   5  * copy of this software and associated documentation files (the            *
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  11  *                                                                          *
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  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               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  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  *                                                                          *
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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 1.132 2015/05/09 17:10:41 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 #ifdef USE_TERM_DRIVER
 128 # ifdef __MINGW32__
 129 static HANDLE
 130 _nc_get_handle(int fd)
 131 {
 132     intptr_t value = _get_osfhandle(fd);
 133     return (HANDLE) value;
 134 }
 135 # endif
 136 #endif
 137
 138 /*
 139  * Check for mouse activity, returning nonzero if we find any.
 140  */
 141 static int
 142 check_mouse_activity(SCREEN *sp, int delay EVENTLIST_2nd(_nc_eventlist * evl))
 143 {
 144     int rc;
 145
 146 #ifdef USE_TERM_DRIVER
 147     TERMINAL_CONTROL_BLOCK *TCB = TCBOf(sp);
 148     rc = TCBOf(sp)->drv->td_testmouse(TCBOf(sp), delay EVENTLIST_2nd(evl));
 149 # ifdef __MINGW32__
 150     /* if we emulate terminfo on console, we have to use the console routine */
 151     if (IsTermInfoOnConsole(sp)) {
 152         HANDLE fd = _nc_get_handle(sp->_ifd);
 153         rc = _nc_mingw_testmouse(sp, fd, delay EVENTLIST_2nd(evl));
 154     } else
 155 # endif
 156         rc = TCB->drv->td_testmouse(TCB, delay EVENTLIST_2nd(evl));
 157 #else
 158 #if USE_SYSMOUSE
 159     if ((sp->_mouse_type == M_SYSMOUSE)
 160         && (sp->_sysmouse_head < sp->_sysmouse_tail)) {
 161         rc = TW_MOUSE;
 162     } else
 163 #endif
 164     {
 165         rc = _nc_timed_wait(sp,
 166                             TWAIT_MASK,
 167                             delay,
 168                             (int *) 0
 169                             EVENTLIST_2nd(evl));
 170 #if USE_SYSMOUSE
 171         if ((sp->_mouse_type == M_SYSMOUSE)
 172             && (sp->_sysmouse_head < sp->_sysmouse_tail)
 173             && (rc == 0)
 174             && (errno == EINTR)) {
 175             rc |= TW_MOUSE;
 176         }
 177 #endif
 178     }
 179 #endif
 180     return rc;
 181 }
 182
 183 static NCURSES_INLINE int
 184 fifo_peek(SCREEN *sp)
 185 {
 186     int ch = (peek >= 0) ? sp->_fifo[peek] : ERR;
 187     TR(TRACE_IEVENT, ("peeking at %d", peek));
 188
 189     p_inc();
 190     return ch;
 191 }
 192
 193 static NCURSES_INLINE int
 194 fifo_pull(SCREEN *sp)
 195 {
 196     int ch = (head >= 0) ? sp->_fifo[head] : ERR;
 197
 198     TR(TRACE_IEVENT, ("pulling %s from %d", _nc_tracechar(sp, ch), head));
 199
 200     if (peek == head) {
 201         h_inc();
 202         peek = head;
 203     } else {
 204         h_inc();
 205     }
 206
 207 #ifdef TRACE
 208     if (USE_TRACEF(TRACE_IEVENT)) {
 209         _nc_fifo_dump(sp);
 210         _nc_unlock_global(tracef);
 211     }
 212 #endif
 213     return ch;
 214 }
 215
 216 static NCURSES_INLINE int
 217 fifo_push(SCREEN *sp EVENTLIST_2nd(_nc_eventlist * evl))
 218 {
 219     int n;
 220     int ch = 0;
 221     int mask = 0;
 222
 223     (void) mask;
 224     if (tail < 0)
 225         return ERR;
 226
 227 #ifdef HIDE_EINTR
 228   again:
 229     errno = 0;
 230 #endif
 231
 232 #ifdef NCURSES_WGETCH_EVENTS
 233     if (evl
 234 #if USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
 235         || (sp->_mouse_fd >= 0)
 236 #endif
 237         ) {
 238         mask = check_mouse_activity(sp, -1 EVENTLIST_2nd(evl));
 239     } else
 240         mask = 0;
 241
 242     if (mask & TW_EVENT) {
 243         T(("fifo_push: ungetch KEY_EVENT"));
 244         safe_ungetch(sp, KEY_EVENT);
 245         return KEY_EVENT;
 246     }
 247 #elif USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
 248     if (sp->_mouse_fd >= 0) {
 249         mask = check_mouse_activity(sp, -1 EVENTLIST_2nd(evl));
 250     }
 251 #endif
 252
 253 #if USE_GPM_SUPPORT || USE_EMX_MOUSE
 254     if ((sp->_mouse_fd >= 0) && (mask & TW_MOUSE)) {
 255         sp->_mouse_event(sp);
 256         ch = KEY_MOUSE;
 257         n = 1;
 258     } else
 259 #endif
 260 #if USE_SYSMOUSE
 261         if ((sp->_mouse_type == M_SYSMOUSE)
 262             && (sp->_sysmouse_head < sp->_sysmouse_tail)) {
 263         sp->_mouse_event(sp);
 264         ch = KEY_MOUSE;
 265         n = 1;
 266     } else if ((sp->_mouse_type == M_SYSMOUSE)
 267                && (mask <= 0) && errno == EINTR) {
 268         sp->_mouse_event(sp);
 269         ch = KEY_MOUSE;
 270         n = 1;
 271     } else
 272 #endif
 273 #ifdef USE_TERM_DRIVER
 274         if ((sp->_mouse_type == M_TERM_DRIVER)
 275             && (sp->_drv_mouse_head < sp->_drv_mouse_tail)) {
 276         sp->_mouse_event(sp);
 277         ch = KEY_MOUSE;
 278         n = 1;
 279     } else
 280 #endif
 281 #if USE_KLIBC_KBD
 282     if (NC_ISATTY(sp->_ifd) && sp->_cbreak) {
 283         ch = _read_kbd(0, 1, !sp->_raw);
 284         n = (ch == -1) ? -1 : 1;
 285         sp->_extended_key = (ch == 0);
 286     } else
 287 #endif
 288     {                           /* Can block... */
 289 #ifdef USE_TERM_DRIVER
 290         int buf;
 291 #ifdef __MINGW32__
 292         if (NC_ISATTY(sp->_ifd) && IsTermInfoOnConsole(sp) && sp->_cbreak)
 293             n = _nc_mingw_console_read(sp,
 294                                        _nc_get_handle(sp->_ifd),
 295                                        &buf);
 296         else
 297 #endif
 298             n = CallDriver_1(sp, td_read, &buf);
 299         ch = buf;
 300 #else
 301         unsigned char c2 = 0;
 302 # if USE_PTHREADS_EINTR
 303 #  if USE_WEAK_SYMBOLS
 304         if ((pthread_self) && (pthread_kill) && (pthread_equal))
 305 #  endif
 306             _nc_globals.read_thread = pthread_self();
 307 # endif
 308         n = (int) read(sp->_ifd, &c2, (size_t) 1);
 309 #if USE_PTHREADS_EINTR
 310         _nc_globals.read_thread = 0;
 311 #endif
 312         ch = c2;
 313 #endif
 314     }
 315
 316 #ifdef HIDE_EINTR
 317     /*
 318      * Under System V curses with non-restarting signals, getch() returns
 319      * with value ERR when a handled signal keeps it from completing.
 320      * If signals restart system calls, OTOH, the signal is invisible
 321      * except to its handler.
 322      *
 323      * We don't want this difference to show.  This piece of code
 324      * tries to make it look like we always have restarting signals.
 325      */
 326     if (n <= 0 && errno == EINTR
 327 # if USE_PTHREADS_EINTR
 328         && (_nc_globals.have_sigwinch == 0)
 329 # endif
 330         )
 331         goto again;
 332 #endif
 333
 334     if ((n == -1) || (n == 0)) {
 335         TR(TRACE_IEVENT, ("read(%d,&ch,1)=%d, errno=%d", sp->_ifd, n, errno));
 336         ch = ERR;
 337     }
 338     TR(TRACE_IEVENT, ("read %d characters", n));
 339
 340     sp->_fifo[tail] = ch;
 341     sp->_fifohold = 0;
 342     if (head == -1)
 343         head = peek = tail;
 344     t_inc();
 345     TR(TRACE_IEVENT, ("pushed %s at %d", _nc_tracechar(sp, ch), tail));
 346 #ifdef TRACE
 347     if (USE_TRACEF(TRACE_IEVENT)) {
 348         _nc_fifo_dump(sp);
 349         _nc_unlock_global(tracef);
 350     }
 351 #endif
 352     return ch;
 353 }
 354
 355 static NCURSES_INLINE void
 356 fifo_clear(SCREEN *sp)
 357 {
 358     memset(sp->_fifo, 0, sizeof(sp->_fifo));
 359     head = -1;
 360     tail = peek = 0;
 361 }
 362
 363 static int kgetch(SCREEN *EVENTLIST_2nd(_nc_eventlist * evl));
 364
 365 static void
 366 recur_wrefresh(WINDOW *win)
 367 {
 368 #ifdef USE_PTHREADS
 369     SCREEN *sp = _nc_screen_of(win);
 370     if (_nc_use_pthreads && sp != CURRENT_SCREEN) {
 371         SCREEN *save_SP;
 372
 373         /* temporarily switch to the window's screen to check/refresh */
 374         _nc_lock_global(curses);
 375         save_SP = CURRENT_SCREEN;
 376         _nc_set_screen(sp);
 377         recur_wrefresh(win);
 378         _nc_set_screen(save_SP);
 379         _nc_unlock_global(curses);
 380     } else
 381 #endif
 382         if ((is_wintouched(win) || (win->_flags & _HASMOVED))
 383             && !(win->_flags & _ISPAD)) {
 384         wrefresh(win);
 385     }
 386 }
 387
 388 static int
 389 recur_wgetnstr(WINDOW *win, char *buf)
 390 {
 391     SCREEN *sp = _nc_screen_of(win);
 392     int rc;
 393
 394     if (sp != 0) {
 395 #ifdef USE_PTHREADS
 396         if (_nc_use_pthreads && sp != CURRENT_SCREEN) {
 397             SCREEN *save_SP;
 398
 399             /* temporarily switch to the window's screen to get cooked input */
 400             _nc_lock_global(curses);
 401             save_SP = CURRENT_SCREEN;
 402             _nc_set_screen(sp);
 403             rc = recur_wgetnstr(win, buf);
 404             _nc_set_screen(save_SP);
 405             _nc_unlock_global(curses);
 406         } else
 407 #endif
 408         {
 409             sp->_called_wgetch = TRUE;
 410             rc = wgetnstr(win, buf, MAXCOLUMNS);
 411             sp->_called_wgetch = FALSE;
 412         }
 413     } else {
 414         rc = ERR;
 415     }
 416     return rc;
 417 }
 418
 419 NCURSES_EXPORT(int)
 420 _nc_wgetch(WINDOW *win,
 421            int *result,
 422            int use_meta
 423            EVENTLIST_2nd(_nc_eventlist * evl))
 424 {
 425     SCREEN *sp;
 426     int ch;
 427     int rc = 0;
 428 #ifdef NCURSES_WGETCH_EVENTS
 429     int event_delay = -1;
 430 #endif
 431
 432     T((T_CALLED("_nc_wgetch(%p)"), (void *) win));
 433
 434     *result = 0;
 435
 436     sp = _nc_screen_of(win);
 437     if (win == 0 || sp == 0) {
 438         returnCode(ERR);
 439     }
 440
 441     if (cooked_key_in_fifo()) {
 442         recur_wrefresh(win);
 443         *result = fifo_pull(sp);
 444         returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 445     }
 446 #ifdef NCURSES_WGETCH_EVENTS
 447     if (evl && (evl->count == 0))
 448         evl = NULL;
 449     event_delay = _nc_eventlist_timeout(evl);
 450 #endif
 451
 452     /*
 453      * Handle cooked mode.  Grab a string from the screen,
 454      * stuff its contents in the FIFO queue, and pop off
 455      * the first character to return it.
 456      */
 457     if (head == -1 &&
 458         !sp->_notty &&
 459         !sp->_raw &&
 460         !sp->_cbreak &&
 461         !sp->_called_wgetch) {
 462         char buf[MAXCOLUMNS], *bufp;
 463
 464         TR(TRACE_IEVENT, ("filling queue in cooked mode"));
 465
 466         /* ungetch in reverse order */
 467 #ifdef NCURSES_WGETCH_EVENTS
 468         rc = recur_wgetnstr(win, buf);
 469         if (rc != KEY_EVENT && rc != ERR)
 470             safe_ungetch(sp, '\n');
 471 #else
 472         if (recur_wgetnstr(win, buf) != ERR)
 473             safe_ungetch(sp, '\n');
 474 #endif
 475         for (bufp = buf + strlen(buf); bufp > buf; bufp--)
 476             safe_ungetch(sp, bufp[-1]);
 477
 478 #ifdef NCURSES_WGETCH_EVENTS
 479         /* Return it first */
 480         if (rc == KEY_EVENT) {
 481             *result = rc;
 482         } else
 483 #endif
 484             *result = fifo_pull(sp);
 485         returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 486     }
 487
 488     if (win->_use_keypad != sp->_keypad_on)
 489         _nc_keypad(sp, win->_use_keypad);
 490
 491     recur_wrefresh(win);
 492
 493     if (win->_notimeout || (win->_delay >= 0) || (sp->_cbreak > 1)) {
 494         if (head == -1) {       /* fifo is empty */
 495             int delay;
 496
 497             TR(TRACE_IEVENT, ("timed delay in wgetch()"));
 498             if (sp->_cbreak > 1)
 499                 delay = (sp->_cbreak - 1) * 100;
 500             else
 501                 delay = win->_delay;
 502
 503 #ifdef NCURSES_WGETCH_EVENTS
 504             if (event_delay >= 0 && delay > event_delay)
 505                 delay = event_delay;
 506 #endif
 507
 508             TR(TRACE_IEVENT, ("delay is %d milliseconds", delay));
 509
 510             rc = check_mouse_activity(sp, delay EVENTLIST_2nd(evl));
 511
 512 #ifdef NCURSES_WGETCH_EVENTS
 513             if (rc & TW_EVENT) {
 514                 *result = KEY_EVENT;
 515                 returnCode(KEY_CODE_YES);
 516             }
 517 #endif
 518             if (!rc) {
 519                 goto check_sigwinch;
 520             }
 521         }
 522         /* else go on to read data available */
 523     }
 524
 525     if (win->_use_keypad) {
 526         /*
 527          * This is tricky.  We only want to get special-key
 528          * events one at a time.  But we want to accumulate
 529          * mouse events until either (a) the mouse logic tells
 530          * us it's picked up a complete gesture, or (b)
 531          * there's a detectable time lapse after one.
 532          *
 533          * Note: if the mouse code starts failing to compose
 534          * press/release events into clicks, you should probably
 535          * increase the wait with mouseinterval().
 536          */
 537         int runcount = 0;
 538
 539         do {
 540             ch = kgetch(sp EVENTLIST_2nd(evl));
 541             if (ch == KEY_MOUSE) {
 542                 ++runcount;
 543                 if (sp->_mouse_inline(sp))
 544                     break;
 545             }
 546             if (sp->_maxclick < 0)
 547                 break;
 548         } while
 549             (ch == KEY_MOUSE
 550              && (((rc = check_mouse_activity(sp, sp->_maxclick
 551                                              EVENTLIST_2nd(evl))) != 0
 552                   && !(rc & TW_EVENT))
 553                  || !sp->_mouse_parse(sp, runcount)));
 554 #ifdef NCURSES_WGETCH_EVENTS
 555         if ((rc & TW_EVENT) && !(ch == KEY_EVENT)) {
 556             safe_ungetch(sp, ch);
 557             ch = KEY_EVENT;
 558         }
 559 #endif
 560         if (runcount > 0 && ch != KEY_MOUSE) {
 561 #ifdef NCURSES_WGETCH_EVENTS
 562             /* mouse event sequence ended by an event, report event */
 563             if (ch == KEY_EVENT) {
 564                 safe_ungetch(sp, KEY_MOUSE);    /* FIXME This interrupts a gesture... */
 565             } else
 566 #endif
 567             {
 568                 /* mouse event sequence ended by keystroke, store keystroke */
 569                 safe_ungetch(sp, ch);
 570                 ch = KEY_MOUSE;
 571             }
 572         }
 573     } else {
 574         if (head == -1)
 575             fifo_push(sp EVENTLIST_2nd(evl));
 576         ch = fifo_pull(sp);
 577     }
 578
 579     if (ch == ERR) {
 580       check_sigwinch:
 581 #if USE_SIZECHANGE
 582         if (_nc_handle_sigwinch(sp)) {
 583             _nc_update_screensize(sp);
 584             /* resizeterm can push KEY_RESIZE */
 585             if (cooked_key_in_fifo()) {
 586                 *result = fifo_pull(sp);
 587                 /*
 588                  * Get the ERR from queue -- it is from WINCH,
 589                  * so we should take it out, the "error" is handled.
 590                  */
 591                 if (fifo_peek(sp) == -1)
 592                     fifo_pull(sp);
 593                 returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
 594             }
 595         }
 596 #endif
 597         returnCode(ERR);
 598     }
 599
 600     /*
 601      * If echo() is in effect, display the printable version of the
 602      * key on the screen.  Carriage return and backspace are treated
 603      * specially by Solaris curses:
 604      *
 605      * If carriage return is defined as a function key in the
 606      * terminfo, e.g., kent, then Solaris may return either ^J (or ^M
 607      * if nonl() is set) or KEY_ENTER depending on the echo() mode.
 608      * We echo before translating carriage return based on nonl(),
 609      * since the visual result simply moves the cursor to column 0.
 610      *
 611      * Backspace is a different matter.  Solaris curses does not
 612      * translate it to KEY_BACKSPACE if kbs=^H.  This does not depend
 613      * on the stty modes, but appears to be a hardcoded special case.
 614      * This is a difference from ncurses, which uses the terminfo entry.
 615      * However, we provide the same visual result as Solaris, moving the
 616      * cursor to the left.
 617      */
 618     if (sp->_echo && !(win->_flags & _ISPAD)) {
 619         chtype backup = (chtype) ((ch == KEY_BACKSPACE) ? '\b' : ch);
 620         if (backup < KEY_MIN)
 621             wechochar(win, backup);
 622     }
 623
 624     /*
 625      * Simulate ICRNL mode
 626      */
 627     if ((ch == '\r') && sp->_nl)
 628         ch = '\n';
 629
 630     /* Strip 8th-bit if so desired.  We do this only for characters that
 631      * are in the range 128-255, to provide compatibility with terminals
 632      * that display only 7-bit characters.  Note that 'ch' may be a
 633      * function key at this point, so we mustn't strip _those_.
 634      */
 635     if (!use_meta)
 636         if ((ch < KEY_MIN) && (ch & 0x80))
 637             ch &= 0x7f;
 638
 639     T(("wgetch returning : %s", _nc_tracechar(sp, ch)));
 640
 641     *result = ch;
 642     returnCode(ch >= KEY_MIN ? KEY_CODE_YES : OK);
 643 }
 644
 645 #ifdef NCURSES_WGETCH_EVENTS
 646 NCURSES_EXPORT(int)
 647 wgetch_events(WINDOW *win, _nc_eventlist * evl)
 648 {
 649     int code;
 650     int value;
 651
 652     T((T_CALLED("wgetch_events(%p,%p)"), win, evl));
 653     code = _nc_wgetch(win,
 654                       &value,
 655                       _nc_use_meta(win)
 656                       EVENTLIST_2nd(evl));
 657     if (code != ERR)
 658         code = value;
 659     returnCode(code);
 660 }
 661 #endif
 662
 663 NCURSES_EXPORT(int)
 664 wgetch(WINDOW *win)
 665 {
 666     int code;
 667     int value;
 668
 669     T((T_CALLED("wgetch(%p)"), (void *) win));
 670     code = _nc_wgetch(win,
 671                       &value,
 672                       _nc_use_meta(win)
 673                       EVENTLIST_2nd((_nc_eventlist *) 0));
 674     if (code != ERR)
 675         code = value;
 676     returnCode(code);
 677 }
 678
 679 /*
 680 **      int
 681 **      kgetch()
 682 **
 683 **      Get an input character, but take care of keypad sequences, returning
 684 **      an appropriate code when one matches the input.  After each character
 685 **      is received, set an alarm call based on ESCDELAY.  If no more of the
 686 **      sequence is received by the time the alarm goes off, pass through
 687 **      the sequence gotten so far.
 688 **
 689 **      This function must be called when there are no cooked keys in queue.
 690 **      (that is head==-1 || peek==head)
 691 **
 692 */
 693
 694 static int
 695 kgetch(SCREEN *sp EVENTLIST_2nd(_nc_eventlist * evl))
 696 {
 697     TRIES *ptr;
 698     int ch = 0;
 699     int timeleft = GetEscdelay(sp);
 700
 701     TR(TRACE_IEVENT, ("kgetch() called"));
 702
 703     ptr = sp->_keytry;
 704
 705     for (;;) {
 706         if (cooked_key_in_fifo() && sp->_fifo[head] >= KEY_MIN) {
 707             break;
 708         } else if (!raw_key_in_fifo()) {
 709             ch = fifo_push(sp EVENTLIST_2nd(evl));
 710             if (ch == ERR) {
 711                 peek = head;    /* the keys stay uninterpreted */
 712                 return ERR;
 713             }
 714 #ifdef NCURSES_WGETCH_EVENTS
 715             else if (ch == KEY_EVENT) {
 716                 peek = head;    /* the keys stay uninterpreted */
 717                 return fifo_pull(sp);   /* Remove KEY_EVENT from the queue */
 718             }
 719 #endif
 720         }
 721
 722         ch = fifo_peek(sp);
 723         if (ch >= KEY_MIN) {
 724             /* If not first in queue, somebody put this key there on purpose in
 725              * emergency.  Consider it higher priority than the unfinished
 726              * keysequence we are parsing.
 727              */
 728             peek = head;
 729             /* assume the key is the last in fifo */
 730             t_dec();            /* remove the key */
 731             return ch;
 732         }
 733
 734         TR(TRACE_IEVENT, ("ch: %s", _nc_tracechar(sp, (unsigned char) ch)));
 735         while ((ptr != NULL) && (ptr->ch != (unsigned char) ch))
 736             ptr = ptr->sibling;
 737
 738         if (ptr == NULL) {
 739             TR(TRACE_IEVENT, ("ptr is null"));
 740             break;
 741         }
 742         TR(TRACE_IEVENT, ("ptr=%p, ch=%d, value=%d",
 743                           (void *) ptr, ptr->ch, ptr->value));
 744
 745         if (ptr->value != 0) {  /* sequence terminated */
 746             TR(TRACE_IEVENT, ("end of sequence"));
 747             if (peek == tail) {
 748                 fifo_clear(sp);
 749             } else {
 750                 head = peek;
 751             }
 752             return (ptr->value);
 753         }
 754
 755         ptr = ptr->child;
 756
 757         if (!raw_key_in_fifo()) {
 758             int rc;
 759
 760             TR(TRACE_IEVENT, ("waiting for rest of sequence"));
 761             rc = check_mouse_activity(sp, timeleft EVENTLIST_2nd(evl));
 762 #ifdef NCURSES_WGETCH_EVENTS
 763             if (rc & TW_EVENT) {
 764                 TR(TRACE_IEVENT, ("interrupted by a user event"));
 765                 /* FIXME Should have preserved remainder timeleft for reuse... */
 766                 peek = head;    /* Restart interpreting later */
 767                 return KEY_EVENT;
 768             }
 769 #endif
 770             if (!rc) {
 771                 TR(TRACE_IEVENT, ("ran out of time"));
 772                 break;
 773             }
 774         }
 775     }
 776     ch = fifo_pull(sp);
 777     peek = head;
 778     return ch;
 779 }