1 /****************************************************************************
2 * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. *
3 * *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
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 *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
22 * *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
26 * authorization. *
27 ****************************************************************************/
28
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <[email protected]> 1992,1995 *
31 * and: Eric S. Raymond <[email protected]> *
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 1.126 2013/02/16 18:30:37 tom Exp $")
46
47 #include <fifo_defs.h>
48
49 #if USE_REENTRANT
50 #define GetEscdelay(sp) *_nc_ptr_Escdelay(sp)
NCURSES_EXPORT(int)51 NCURSES_EXPORT(int)
52 NCURSES_PUBLIC_VAR(ESCDELAY) (void)
53 {
54 return *(_nc_ptr_Escdelay(CURRENT_SCREEN));
55 }
56
57 NCURSES_EXPORT(int *)
_nc_ptr_Escdelay(SCREEN * sp)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)
NCURSES_SP_NAME(set_escdelay)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)
set_escdelay(int value)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)
NCURSES_SP_NAME(get_escdelay)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)
get_escdelay(void)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
_nc_use_meta(WINDOW * win)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
check_mouse_activity(SCREEN * sp,int delay EVENTLIST_2nd (_nc_eventlist * evl))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 EVENTLIST_2nd(evl));
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
fifo_peek(SCREEN * sp)164 fifo_peek(SCREEN *sp)
165 {
166 int ch = (peek >= 0) ? sp->_fifo[peek] : ERR;
167 TR(TRACE_IEVENT, ("peeking at %d", peek));
168
169 p_inc();
170 return ch;
171 }
172
173 static NCURSES_INLINE int
fifo_pull(SCREEN * sp)174 fifo_pull(SCREEN *sp)
175 {
176 int ch = (head >= 0) ? sp->_fifo[head] : ERR;
177
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
187 #ifdef TRACE
188 if (USE_TRACEF(TRACE_IEVENT)) {
189 _nc_fifo_dump(sp);
190 _nc_unlock_global(tracef);
191 }
192 #endif
193 return ch;
194 }
195
196 static NCURSES_INLINE int
fifo_push(SCREEN * sp EVENTLIST_2nd (_nc_eventlist * evl))197 fifo_push(SCREEN *sp EVENTLIST_2nd(_nc_eventlist * evl))
198 {
199 int n;
200 int ch = 0;
201 int mask = 0;
202
203 (void) mask;
204 if (tail < 0)
205 return ERR;
206
207 #ifdef HIDE_EINTR
208 again:
209 errno = 0;
210 #endif
211
212 #ifdef NCURSES_WGETCH_EVENTS
213 if (evl
214 #if USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
215 || (sp->_mouse_fd >= 0)
216 #endif
217 ) {
218 mask = check_mouse_activity(sp, -1 EVENTLIST_2nd(evl));
219 } else
220 mask = 0;
221
222 if (mask & TW_EVENT) {
223 T(("fifo_push: ungetch KEY_EVENT"));
224 safe_ungetch(sp, KEY_EVENT);
225 return KEY_EVENT;
226 }
227 #elif USE_GPM_SUPPORT || USE_EMX_MOUSE || USE_SYSMOUSE
228 if (sp->_mouse_fd >= 0) {
229 mask = check_mouse_activity(sp, -1 EVENTLIST_2nd(evl));
230 }
231 #endif
232
233 #if USE_GPM_SUPPORT || USE_EMX_MOUSE
234 if ((sp->_mouse_fd >= 0) && (mask & TW_MOUSE)) {
235 sp->_mouse_event(sp);
236 ch = KEY_MOUSE;
237 n = 1;
238 } else
239 #endif
240 #if USE_SYSMOUSE
241 if ((sp->_mouse_type == M_SYSMOUSE)
242 && (sp->_sysmouse_head < sp->_sysmouse_tail)) {
243 sp->_mouse_event(sp);
244 ch = KEY_MOUSE;
245 n = 1;
246 } else if ((sp->_mouse_type == M_SYSMOUSE)
247 && (mask <= 0) && errno == EINTR) {
248 sp->_mouse_event(sp);
249 ch = KEY_MOUSE;
250 n = 1;
251 } else
252 #endif
253 #ifdef USE_TERM_DRIVER
254 if ((sp->_mouse_type == M_TERM_DRIVER)
255 && (sp->_drv_mouse_head < sp->_drv_mouse_tail)) {
256 sp->_mouse_event(sp);
257 ch = KEY_MOUSE;
258 n = 1;
259 } else
260 #endif
261 #if USE_KLIBC_KBD
262 if (isatty(sp->_ifd) && sp->_cbreak) {
263 ch = _read_kbd(0, 1, !sp->_raw);
264 n = (ch == -1) ? -1 : 1;
265 sp->_extended_key = (ch == 0);
266 } else
267 #endif
268 { /* Can block... */
269 #ifdef USE_TERM_DRIVER
270 int buf;
271 n = CallDriver_1(sp, read, &buf);
272 ch = buf;
273 #else
274 unsigned char c2 = 0;
275 # if USE_PTHREADS_EINTR
276 # if USE_WEAK_SYMBOLS
277 if ((pthread_self) && (pthread_kill) && (pthread_equal))
278 # endif
279 _nc_globals.read_thread = pthread_self();
280 # endif
281 n = (int) read(sp->_ifd, &c2, (size_t) 1);
282 #if USE_PTHREADS_EINTR
283 _nc_globals.read_thread = 0;
284 #endif
285 ch = c2;
286 #endif
287 }
288
289 #ifdef HIDE_EINTR
290 /*
291 * Under System V curses with non-restarting signals, getch() returns
292 * with value ERR when a handled signal keeps it from completing.
293 * If signals restart system calls, OTOH, the signal is invisible
294 * except to its handler.
295 *
296 * We don't want this difference to show. This piece of code
297 * tries to make it look like we always have restarting signals.
298 */
299 if (n <= 0 && errno == EINTR
300 # if USE_PTHREADS_EINTR
301 && (_nc_globals.have_sigwinch == 0)
302 # endif
303 )
304 goto again;
305 #endif
306
307 if ((n == -1) || (n == 0)) {
308 TR(TRACE_IEVENT, ("read(%d,&ch,1)=%d, errno=%d", sp->_ifd, n, errno));
309 ch = ERR;
310 }
311 TR(TRACE_IEVENT, ("read %d characters", n));
312
313 sp->_fifo[tail] = ch;
314 sp->_fifohold = 0;
315 if (head == -1)
316 head = peek = tail;
317 t_inc();
318 TR(TRACE_IEVENT, ("pushed %s at %d", _nc_tracechar(sp, ch), tail));
319 #ifdef TRACE
320 if (USE_TRACEF(TRACE_IEVENT)) {
321 _nc_fifo_dump(sp);
322 _nc_unlock_global(tracef);
323 }
324 #endif
325 return ch;
326 }
327
328 static NCURSES_INLINE void
fifo_clear(SCREEN * sp)329 fifo_clear(SCREEN *sp)
330 {
331 memset(sp->_fifo, 0, sizeof(sp->_fifo));
332 head = -1;
333 tail = peek = 0;
334 }
335
336 static int kgetch(SCREEN *EVENTLIST_2nd(_nc_eventlist * evl));
337
338 static void
recur_wrefresh(WINDOW * win)339 recur_wrefresh(WINDOW *win)
340 {
341 #ifdef USE_PTHREADS
342 SCREEN *sp = _nc_screen_of(win);
343 if (_nc_use_pthreads && sp != CURRENT_SCREEN) {
344 SCREEN *save_SP;
345
346 /* temporarily switch to the window's screen to check/refresh */
347 _nc_lock_global(curses);
348 save_SP = CURRENT_SCREEN;
349 _nc_set_screen(sp);
350 recur_wrefresh(win);
351 _nc_set_screen(save_SP);
352 _nc_unlock_global(curses);
353 } else
354 #endif
355 if ((is_wintouched(win) || (win->_flags & _HASMOVED))
356 && !(win->_flags & _ISPAD)) {
357 wrefresh(win);
358 }
359 }
360
361 static int
recur_wgetnstr(WINDOW * win,char * buf)362 recur_wgetnstr(WINDOW *win, char *buf)
363 {
364 SCREEN *sp = _nc_screen_of(win);
365 int rc;
366
367 if (sp != 0) {
368 #ifdef USE_PTHREADS
369 if (_nc_use_pthreads && sp != CURRENT_SCREEN) {
370 SCREEN *save_SP;
371
372 /* temporarily switch to the window's screen to get cooked input */
373 _nc_lock_global(curses);
374 save_SP = CURRENT_SCREEN;
375 _nc_set_screen(sp);
376 rc = recur_wgetnstr(win, buf);
377 _nc_set_screen(save_SP);
378 _nc_unlock_global(curses);
379 } else
380 #endif
381 {
382 sp->_called_wgetch = TRUE;
383 rc = wgetnstr(win, buf, MAXCOLUMNS);
384 sp->_called_wgetch = FALSE;
385 }
386 } else {
387 rc = ERR;
388 }
389 return rc;
390 }
391
392 NCURSES_EXPORT(int)
_nc_wgetch(WINDOW * win,int * result,int use_meta EVENTLIST_2nd (_nc_eventlist * evl))393 _nc_wgetch(WINDOW *win,
394 int *result,
395 int use_meta
396 EVENTLIST_2nd(_nc_eventlist * evl))
397 {
398 SCREEN *sp;
399 int ch;
400 int rc = 0;
401 #ifdef NCURSES_WGETCH_EVENTS
402 long event_delay = -1;
403 #endif
404
405 T((T_CALLED("_nc_wgetch(%p)"), (void *) win));
406
407 *result = 0;
408
409 sp = _nc_screen_of(win);
410 if (win == 0 || sp == 0) {
411 returnCode(ERR);
412 }
413
414 if (cooked_key_in_fifo()) {
415 recur_wrefresh(win);
416 *result = fifo_pull(sp);
417 returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
418 }
419 #ifdef NCURSES_WGETCH_EVENTS
420 if (evl && (evl->count == 0))
421 evl = NULL;
422 event_delay = _nc_eventlist_timeout(evl);
423 #endif
424
425 /*
426 * Handle cooked mode. Grab a string from the screen,
427 * stuff its contents in the FIFO queue, and pop off
428 * the first character to return it.
429 */
430 if (head == -1 &&
431 !sp->_notty &&
432 !sp->_raw &&
433 !sp->_cbreak &&
434 !sp->_called_wgetch) {
435 char buf[MAXCOLUMNS], *bufp;
436
437 TR(TRACE_IEVENT, ("filling queue in cooked mode"));
438
439 /* ungetch in reverse order */
440 #ifdef NCURSES_WGETCH_EVENTS
441 rc = recur_wgetnstr(win, buf);
442 if (rc != KEY_EVENT && rc != ERR)
443 safe_ungetch(sp, '\n');
444 #else
445 if (recur_wgetnstr(win, buf) != ERR)
446 safe_ungetch(sp, '\n');
447 #endif
448 for (bufp = buf + strlen(buf); bufp > buf; bufp--)
449 safe_ungetch(sp, bufp[-1]);
450
451 #ifdef NCURSES_WGETCH_EVENTS
452 /* Return it first */
453 if (rc == KEY_EVENT) {
454 *result = rc;
455 } else
456 #endif
457 *result = fifo_pull(sp);
458 returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
459 }
460
461 if (win->_use_keypad != sp->_keypad_on)
462 _nc_keypad(sp, win->_use_keypad);
463
464 recur_wrefresh(win);
465
466 if (win->_notimeout || (win->_delay >= 0) || (sp->_cbreak > 1)) {
467 if (head == -1) { /* fifo is empty */
468 int delay;
469
470 TR(TRACE_IEVENT, ("timed delay in wgetch()"));
471 if (sp->_cbreak > 1)
472 delay = (sp->_cbreak - 1) * 100;
473 else
474 delay = win->_delay;
475
476 #ifdef NCURSES_WGETCH_EVENTS
477 if (event_delay >= 0 && delay > event_delay)
478 delay = event_delay;
479 #endif
480
481 TR(TRACE_IEVENT, ("delay is %d milliseconds", delay));
482
483 rc = check_mouse_activity(sp, delay EVENTLIST_2nd(evl));
484
485 #ifdef NCURSES_WGETCH_EVENTS
486 if (rc & TW_EVENT) {
487 *result = KEY_EVENT;
488 returnCode(KEY_CODE_YES);
489 }
490 #endif
491 if (!rc) {
492 goto check_sigwinch;
493 }
494 }
495 /* else go on to read data available */
496 }
497
498 if (win->_use_keypad) {
499 /*
500 * This is tricky. We only want to get special-key
501 * events one at a time. But we want to accumulate
502 * mouse events until either (a) the mouse logic tells
503 * us it's picked up a complete gesture, or (b)
504 * there's a detectable time lapse after one.
505 *
506 * Note: if the mouse code starts failing to compose
507 * press/release events into clicks, you should probably
508 * increase the wait with mouseinterval().
509 */
510 int runcount = 0;
511
512 do {
513 ch = kgetch(sp EVENTLIST_2nd(evl));
514 if (ch == KEY_MOUSE) {
515 ++runcount;
516 if (sp->_mouse_inline(sp))
517 break;
518 }
519 if (sp->_maxclick < 0)
520 break;
521 } while
522 (ch == KEY_MOUSE
523 && (((rc = check_mouse_activity(sp, sp->_maxclick
524 EVENTLIST_2nd(evl))) != 0
525 && !(rc & TW_EVENT))
526 || !sp->_mouse_parse(sp, runcount)));
527 #ifdef NCURSES_WGETCH_EVENTS
528 if ((rc & TW_EVENT) && !(ch == KEY_EVENT)) {
529 safe_ungetch(sp, ch);
530 ch = KEY_EVENT;
531 }
532 #endif
533 if (runcount > 0 && ch != KEY_MOUSE) {
534 #ifdef NCURSES_WGETCH_EVENTS
535 /* mouse event sequence ended by an event, report event */
536 if (ch == KEY_EVENT) {
537 safe_ungetch(sp, KEY_MOUSE); /* FIXME This interrupts a gesture... */
538 } else
539 #endif
540 {
541 /* mouse event sequence ended by keystroke, store keystroke */
542 safe_ungetch(sp, ch);
543 ch = KEY_MOUSE;
544 }
545 }
546 } else {
547 if (head == -1)
548 fifo_push(sp EVENTLIST_2nd(evl));
549 ch = fifo_pull(sp);
550 }
551
552 if (ch == ERR) {
553 check_sigwinch:
554 #if USE_SIZECHANGE
555 if (_nc_handle_sigwinch(sp)) {
556 _nc_update_screensize(sp);
557 /* resizeterm can push KEY_RESIZE */
558 if (cooked_key_in_fifo()) {
559 *result = fifo_pull(sp);
560 /*
561 * Get the ERR from queue -- it is from WINCH,
562 * so we should take it out, the "error" is handled.
563 */
564 if (fifo_peek(sp) == -1)
565 fifo_pull(sp);
566 returnCode(*result >= KEY_MIN ? KEY_CODE_YES : OK);
567 }
568 }
569 #endif
570 returnCode(ERR);
571 }
572
573 /*
574 * If echo() is in effect, display the printable version of the
575 * key on the screen. Carriage return and backspace are treated
576 * specially by Solaris curses:
577 *
578 * If carriage return is defined as a function key in the
579 * terminfo, e.g., kent, then Solaris may return either ^J (or ^M
580 * if nonl() is set) or KEY_ENTER depending on the echo() mode.
581 * We echo before translating carriage return based on nonl(),
582 * since the visual result simply moves the cursor to column 0.
583 *
584 * Backspace is a different matter. Solaris curses does not
585 * translate it to KEY_BACKSPACE if kbs=^H. This does not depend
586 * on the stty modes, but appears to be a hardcoded special case.
587 * This is a difference from ncurses, which uses the terminfo entry.
588 * However, we provide the same visual result as Solaris, moving the
589 * cursor to the left.
590 */
591 if (sp->_echo && !(win->_flags & _ISPAD)) {
592 chtype backup = (chtype) ((ch == KEY_BACKSPACE) ? '\b' : ch);
593 if (backup < KEY_MIN)
594 wechochar(win, backup);
595 }
596
597 /*
598 * Simulate ICRNL mode
599 */
600 if ((ch == '\r') && sp->_nl)
601 ch = '\n';
602
603 /* Strip 8th-bit if so desired. We do this only for characters that
604 * are in the range 128-255, to provide compatibility with terminals
605 * that display only 7-bit characters. Note that 'ch' may be a
606 * function key at this point, so we mustn't strip _those_.
607 */
608 if (!use_meta)
609 if ((ch < KEY_MIN) && (ch & 0x80))
610 ch &= 0x7f;
611
612 T(("wgetch returning : %s", _nc_tracechar(sp, ch)));
613
614 *result = ch;
615 returnCode(ch >= KEY_MIN ? KEY_CODE_YES : OK);
616 }
617
618 #ifdef NCURSES_WGETCH_EVENTS
619 NCURSES_EXPORT(int)
wgetch_events(WINDOW * win,_nc_eventlist * evl)620 wgetch_events(WINDOW *win, _nc_eventlist * evl)
621 {
622 int code;
623 int value;
624
625 T((T_CALLED("wgetch_events(%p,%p)"), win, evl));
626 code = _nc_wgetch(win,
627 &value,
628 _nc_use_meta(win)
629 EVENTLIST_2nd(evl));
630 if (code != ERR)
631 code = value;
632 returnCode(code);
633 }
634 #endif
635
636 NCURSES_EXPORT(int)
wgetch(WINDOW * win)637 wgetch(WINDOW *win)
638 {
639 int code;
640 int value;
641
642 T((T_CALLED("wgetch(%p)"), (void *) win));
643 code = _nc_wgetch(win,
644 &value,
645 _nc_use_meta(win)
646 EVENTLIST_2nd((_nc_eventlist *) 0));
647 if (code != ERR)
648 code = value;
649 returnCode(code);
650 }
651
652 /*
653 ** int
654 ** kgetch()
655 **
656 ** Get an input character, but take care of keypad sequences, returning
657 ** an appropriate code when one matches the input. After each character
658 ** is received, set an alarm call based on ESCDELAY. If no more of the
659 ** sequence is received by the time the alarm goes off, pass through
660 ** the sequence gotten so far.
661 **
662 ** This function must be called when there are no cooked keys in queue.
663 ** (that is head==-1 || peek==head)
664 **
665 */
666
667 static int
kgetch(SCREEN * sp EVENTLIST_2nd (_nc_eventlist * evl))668 kgetch(SCREEN *sp EVENTLIST_2nd(_nc_eventlist * evl))
669 {
670 TRIES *ptr;
671 int ch = 0;
672 int timeleft = GetEscdelay(sp);
673
674 TR(TRACE_IEVENT, ("kgetch() called"));
675
676 ptr = sp->_keytry;
677
678 for (;;) {
679 if (cooked_key_in_fifo() && sp->_fifo[head] >= KEY_MIN) {
680 break;
681 } else if (!raw_key_in_fifo()) {
682 ch = fifo_push(sp EVENTLIST_2nd(evl));
683 if (ch == ERR) {
684 peek = head; /* the keys stay uninterpreted */
685 return ERR;
686 }
687 #ifdef NCURSES_WGETCH_EVENTS
688 else if (ch == KEY_EVENT) {
689 peek = head; /* the keys stay uninterpreted */
690 return fifo_pull(sp); /* Remove KEY_EVENT from the queue */
691 }
692 #endif
693 }
694
695 ch = fifo_peek(sp);
696 if (ch >= KEY_MIN) {
697 /* If not first in queue, somebody put this key there on purpose in
698 * emergency. Consider it higher priority than the unfinished
699 * keysequence we are parsing.
700 */
701 peek = head;
702 /* assume the key is the last in fifo */
703 t_dec(); /* remove the key */
704 return ch;
705 }
706
707 TR(TRACE_IEVENT, ("ch: %s", _nc_tracechar(sp, (unsigned char) ch)));
708 while ((ptr != NULL) && (ptr->ch != (unsigned char) ch))
709 ptr = ptr->sibling;
710
711 if (ptr == NULL) {
712 TR(TRACE_IEVENT, ("ptr is null"));
713 break;
714 }
715 TR(TRACE_IEVENT, ("ptr=%p, ch=%d, value=%d",
716 (void *) ptr, ptr->ch, ptr->value));
717
718 if (ptr->value != 0) { /* sequence terminated */
719 TR(TRACE_IEVENT, ("end of sequence"));
720 if (peek == tail) {
721 fifo_clear(sp);
722 } else {
723 head = peek;
724 }
725 return (ptr->value);
726 }
727
728 ptr = ptr->child;
729
730 if (!raw_key_in_fifo()) {
731 int rc;
732
733 TR(TRACE_IEVENT, ("waiting for rest of sequence"));
734 rc = check_mouse_activity(sp, timeleft EVENTLIST_2nd(evl));
735 #ifdef NCURSES_WGETCH_EVENTS
736 if (rc & TW_EVENT) {
737 TR(TRACE_IEVENT, ("interrupted by a user event"));
738 /* FIXME Should have preserved remainder timeleft for reuse... */
739 peek = head; /* Restart interpreting later */
740 return KEY_EVENT;
741 }
742 #endif
743 if (!rc) {
744 TR(TRACE_IEVENT, ("ran out of time"));
745 break;
746 }
747 }
748 }
749 ch = fifo_pull(sp);
750 peek = head;
751 return ch;
752 }
753