GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcurses/tty/tty_update.c Lines: 0 604 0.0 %
Date: 2017-11-13 Branches: 0 941 0.0 %

Line Branch Exec Source
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/* $OpenBSD: tty_update.c,v 1.16 2010/01/12 23:22:07 nicm Exp $ */
2
3
/****************************************************************************
4
 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
5
 *                                                                          *
6
 * Permission is hereby granted, free of charge, to any person obtaining a  *
7
 * copy of this software and associated documentation files (the            *
8
 * "Software"), to deal in the Software without restriction, including      *
9
 * without limitation the rights to use, copy, modify, merge, publish,      *
10
 * distribute, distribute with modifications, sublicense, and/or sell       *
11
 * copies of the Software, and to permit persons to whom the Software is    *
12
 * furnished to do so, subject to the following conditions:                 *
13
 *                                                                          *
14
 * The above copyright notice and this permission notice shall be included  *
15
 * in all copies or substantial portions of the Software.                   *
16
 *                                                                          *
17
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
18
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
19
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
20
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
21
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
22
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
23
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
24
 *                                                                          *
25
 * Except as contained in this notice, the name(s) of the above copyright   *
26
 * holders shall not be used in advertising or otherwise to promote the     *
27
 * sale, use or other dealings in this Software without prior written       *
28
 * authorization.                                                           *
29
 ****************************************************************************/
30
31
/****************************************************************************
32
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
33
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
34
 *     and: Thomas E. Dickey                        1996-on                 *
35
 ****************************************************************************/
36
37
/*-----------------------------------------------------------------
38
 *
39
 *	lib_doupdate.c
40
 *
41
 * 	The routine doupdate() and its dependents.
42
 * 	All physical output is concentrated here (except _nc_outch()
43
  *	in lib_tputs.c).
44
 *
45
 *-----------------------------------------------------------------*/
46
47
#include <curses.priv.h>
48
49
#if defined __HAIKU__ && defined __BEOS__
50
#undef __BEOS__
51
#endif
52
53
#ifdef __BEOS__
54
#undef false
55
#undef true
56
#include <OS.h>
57
#endif
58
59
#if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES
60
#define USE_TRACE_TIMES 1
61
#else
62
#define USE_TRACE_TIMES 0
63
#endif
64
65
#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
66
#include <sys/time.h>
67
#endif
68
69
#if USE_TRACE_TIMES
70
#include <sys/times.h>
71
#endif
72
73
#if USE_FUNC_POLL
74
#elif HAVE_SELECT
75
#if HAVE_SYS_SELECT_H
76
#include <sys/select.h>
77
#endif
78
#endif
79
80
#include <ctype.h>
81
#include <term.h>
82
83
MODULE_ID("$Id: tty_update.c,v 1.16 2010/01/12 23:22:07 nicm Exp $")
84
85
/*
86
 * This define controls the line-breakout optimization.  Every once in a
87
 * while during screen refresh, we want to check for input and abort the
88
 * update if there's some waiting.  CHECK_INTERVAL controls the number of
89
 * changed lines to be emitted between input checks.
90
 *
91
 * Note: Input-check-and-abort is no longer done if the screen is being
92
 * updated from scratch.  This is a feature, not a bug.
93
 */
94
#define CHECK_INTERVAL	5
95
96
#define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase)
97
98
static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT);
99
static NCURSES_CH_T normal = NewChar(BLANK_TEXT);
100
101
/*
102
 * Enable checking to see if doupdate and friends are tracking the true
103
 * cursor position correctly.  NOTE: this is a debugging hack which will
104
 * work ONLY on ANSI-compatible terminals!
105
 */
106
/* #define POSITION_DEBUG */
107
108
static NCURSES_INLINE NCURSES_CH_T ClrBlank(WINDOW *win);
109
static int ClrBottom(int total);
110
static void ClearScreen(NCURSES_CH_T blank);
111
static void ClrUpdate(void);
112
static void DelChar(int count);
113
static void InsStr(NCURSES_CH_T * line, int count);
114
static void TransformLine(int const lineno);
115
116
#ifdef POSITION_DEBUG
117
/****************************************************************************
118
 *
119
 * Debugging code.  Only works on ANSI-standard terminals.
120
 *
121
 ****************************************************************************/
122
123
static void
124
position_check(int expected_y, int expected_x, char *legend)
125
/* check to see if the real cursor position matches the virtual */
126
{
127
    char buf[20];
128
    char *s;
129
    int y, x;
130
131
    if (!_nc_tracing || (expected_y < 0 && expected_x < 0))
132
	return;
133
134
    _nc_flush();
135
    memset(buf, '\0', sizeof(buf));
136
    putp("\033[6n");		/* only works on ANSI-compatibles */
137
    _nc_flush();
138
    *(s = buf) = 0;
139
    do {
140
	int ask = sizeof(buf) - 1 - (s - buf);
141
	int got = read(0, s, ask);
142
	if (got == 0)
143
	    break;
144
	s += got;
145
    } while (strchr(buf, 'R') == 0);
146
    _tracef("probe returned %s", _nc_visbuf(buf));
147
148
    /* try to interpret as a position report */
149
    if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) {
150
	_tracef("position probe failed in %s", legend);
151
    } else {
152
	if (expected_x < 0)
153
	    expected_x = x - 1;
154
	if (expected_y < 0)
155
	    expected_y = y - 1;
156
	if (y - 1 != expected_y || x - 1 != expected_x) {
157
	    beep();
158
	    tputs(tparm("\033[%d;%dH", expected_y + 1, expected_x + 1), 1, _nc_outch);
159
	    _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s",
160
		    y - 1, x - 1, expected_y, expected_x, legend);
161
	} else {
162
	    _tracef("position matches OK in %s", legend);
163
	}
164
    }
165
}
166
#else
167
#define position_check(expected_y, expected_x, legend)	/* nothing */
168
#endif /* POSITION_DEBUG */
169
170
/****************************************************************************
171
 *
172
 * Optimized update code
173
 *
174
 ****************************************************************************/
175
176
static NCURSES_INLINE void
177
GoTo(int const row, int const col)
178
{
179
    TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)",
180
		    row, col, SP->_cursrow, SP->_curscol));
181
182
    position_check(SP->_cursrow, SP->_curscol, "GoTo");
183
184
    mvcur(SP->_cursrow, SP->_curscol, row, col);
185
    position_check(SP->_cursrow, SP->_curscol, "GoTo2");
186
}
187
188
static NCURSES_INLINE void
189
PutAttrChar(CARG_CH_T ch)
190
{
191
    int chlen = 1;
192
    NCURSES_CH_T my_ch;
193
    PUTC_DATA;
194
    NCURSES_CH_T tilde;
195
    NCURSES_CH_T attr = CHDEREF(ch);
196
197
    TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)",
198
		       _tracech_t(ch),
199
		       SP->_cursrow, SP->_curscol));
200
#if USE_WIDEC_SUPPORT
201
    /*
202
     * If this is not a valid character, there is nothing more to do.
203
     */
204
    if (isWidecExt(CHDEREF(ch))) {
205
	TR(TRACE_CHARPUT, ("...skip"));
206
	return;
207
    }
208
    /*
209
     * Determine the number of character cells which the 'ch' value will use
210
     * on the screen.  It should be at least one.
211
     */
212
    if ((chlen = wcwidth(CharOf(CHDEREF(ch)))) <= 0) {
213
	static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
214
215
	/*
216
	 * If the character falls into any of these special cases, do
217
	 * not force the result to a blank:
218
	 *
219
	 * a) it is printable (this works around a bug in wcwidth()).
220
	 * b) use_legacy_coding() has been called to modify the treatment
221
	 *    of codes 128-255.
222
	 * c) the acs_map[] has been initialized to allow codes 0-31
223
	 *    to be rendered.  This supports Linux console's "PC"
224
	 *    characters.  Codes 128-255 are allowed though this is
225
	 *    not checked.
226
	 */
227
	if (is8bits(CharOf(CHDEREF(ch)))
228
	    && (isprint(CharOf(CHDEREF(ch)))
229
		|| (SP->_legacy_coding > 0 && CharOf(CHDEREF(ch)) >= 160)
230
		|| (SP->_legacy_coding > 1 && CharOf(CHDEREF(ch)) >= 128)
231
		|| (AttrOf(attr) & A_ALTCHARSET
232
		    && ((CharOfD(ch) < ACS_LEN
233
			 && SP->_acs_map != 0
234
			 && SP->_acs_map[CharOfD(ch)] != 0)
235
			|| (CharOfD(ch) >= 128))))) {
236
	    ;
237
	} else {
238
	    ch = CHREF(blank);
239
	    TR(TRACE_CHARPUT, ("forced to blank"));
240
	}
241
	chlen = 1;
242
    }
243
#endif
244
245
    if ((AttrOf(attr) & A_ALTCHARSET)
246
	&& SP->_acs_map != 0
247
	&& CharOfD(ch) < ACS_LEN) {
248
	my_ch = CHDEREF(ch);	/* work around const param */
249
#if USE_WIDEC_SUPPORT
250
	/*
251
	 * This is crude & ugly, but works most of the time.  It checks if the
252
	 * acs_chars string specified that we have a mapping for this
253
	 * character, and uses the wide-character mapping when we expect the
254
	 * normal one to be broken (by mis-design ;-).
255
	 */
256
	if (SP->_screen_acs_fix
257
	    && SP->_screen_acs_map[CharOf(my_ch)]) {
258
	    RemAttr(attr, A_ALTCHARSET);
259
	    my_ch = _nc_wacs[CharOf(my_ch)];
260
	}
261
#endif
262
	/*
263
	 * If we (still) have alternate character set, it is the normal 8bit
264
	 * flavor.  The _screen_acs_map[] array tells if the character was
265
	 * really in acs_chars, needed because of the way wide/normal line
266
	 * drawing flavors are integrated.
267
	 */
268
	if (AttrOf(attr) & A_ALTCHARSET) {
269
	    int j = CharOfD(ch);
270
	    chtype temp = UChar(SP->_acs_map[j]);
271
272
	    if (!(SP->_screen_acs_map[j])) {
273
		RemAttr(attr, A_ALTCHARSET);
274
		if (temp == 0)
275
		    temp = ' ';
276
	    }
277
	    if (temp != 0)
278
		SetChar(my_ch, temp, AttrOf(attr));
279
	}
280
	ch = CHREF(my_ch);
281
    }
282
    if (tilde_glitch && (CharOfD(ch) == L('~'))) {
283
	SetChar(tilde, L('`'), AttrOf(attr));
284
	ch = CHREF(tilde);
285
    }
286
287
    UpdateAttrs(attr);
288
#if !USE_WIDEC_SUPPORT
289
    /* FIXME - we do this special case for signal handling, should see how to
290
     * make it work for wide characters.
291
     */
292
    if (SP->_outch != 0) {
293
	SP->_outch(UChar(ch));
294
    } else
295
#endif
296
    {
297
	PUTC(CHDEREF(ch), SP->_ofp);	/* macro's fastest... */
298
	COUNT_OUTCHARS(1);
299
    }
300
    SP->_curscol += chlen;
301
    if (char_padding) {
302
	TPUTS_TRACE("char_padding");
303
	putp(char_padding);
304
    }
305
}
306
307
static bool
308
check_pending(void)
309
/* check for pending input */
310
{
311
    bool have_pending = FALSE;
312
313
    /*
314
     * Only carry out this check when the flag is zero, otherwise we'll
315
     * have the refreshing slow down drastically (or stop) if there's an
316
     * unread character available.
317
     */
318
    if (SP->_fifohold != 0)
319
	return FALSE;
320
321
    if (SP->_checkfd >= 0) {
322
#if USE_FUNC_POLL
323
	struct pollfd fds[1];
324
	fds[0].fd = SP->_checkfd;
325
	fds[0].events = POLLIN;
326
	if (poll(fds, 1, 0) > 0) {
327
	    have_pending = TRUE;
328
	}
329
#elif defined(__BEOS__)
330
	/*
331
	 * BeOS's select() is declared in socket.h, so the configure script does
332
	 * not see it.  That's just as well, since that function works only for
333
	 * sockets.  This (using snooze and ioctl) was distilled from Be's patch
334
	 * for ncurses which uses a separate thread to simulate select().
335
	 *
336
	 * FIXME: the return values from the ioctl aren't very clear if we get
337
	 * interrupted.
338
	 */
339
	int n = 0;
340
	int howmany = ioctl(0, 'ichr', &n);
341
	if (howmany >= 0 && n > 0) {
342
	    have_pending = TRUE;
343
	}
344
#elif HAVE_SELECT
345
	fd_set fdset;
346
	struct timeval ktimeout;
347
348
	ktimeout.tv_sec =
349
	    ktimeout.tv_usec = 0;
350
351
	FD_ZERO(&fdset);
352
	FD_SET(SP->_checkfd, &fdset);
353
	if (select(SP->_checkfd + 1, &fdset, NULL, NULL, &ktimeout) != 0) {
354
	    have_pending = TRUE;
355
	}
356
#endif
357
    }
358
    if (have_pending) {
359
	SP->_fifohold = 5;
360
	_nc_flush();
361
    }
362
    return FALSE;
363
}
364
365
/* put char at lower right corner */
366
static void
367
PutCharLR(const ARG_CH_T ch)
368
{
369
    if (!auto_right_margin) {
370
	/* we can put the char directly */
371
	PutAttrChar(ch);
372
    } else if (enter_am_mode && exit_am_mode) {
373
	/* we can suppress automargin */
374
	TPUTS_TRACE("exit_am_mode");
375
	putp(exit_am_mode);
376
377
	PutAttrChar(ch);
378
	SP->_curscol--;
379
	position_check(SP->_cursrow, SP->_curscol, "exit_am_mode");
380
381
	TPUTS_TRACE("enter_am_mode");
382
	putp(enter_am_mode);
383
    } else if ((enter_insert_mode && exit_insert_mode)
384
	       || insert_character || parm_ich) {
385
	GoTo(screen_lines - 1, screen_columns - 2);
386
	PutAttrChar(ch);
387
	GoTo(screen_lines - 1, screen_columns - 2);
388
	InsStr(newscr->_line[screen_lines - 1].text + screen_columns - 2, 1);
389
    }
390
}
391
392
/*
393
 * Wrap the cursor position, i.e., advance to the beginning of the next line.
394
 */
395
static void
396
wrap_cursor(void)
397
{
398
    if (eat_newline_glitch) {
399
	/*
400
	 * xenl can manifest two different ways.  The vt100 way is that, when
401
	 * you'd expect the cursor to wrap, it stays hung at the right margin
402
	 * (on top of the character just emitted) and doesn't wrap until the
403
	 * *next* graphic char is emitted.  The c100 way is to ignore LF
404
	 * received just after an am wrap.
405
	 *
406
	 * An aggressive way to handle this would be to emit CR/LF after the
407
	 * char and then assume the wrap is done, you're on the first position
408
	 * of the next line, and the terminal out of its weird state.  Here
409
	 * it's safe to just tell the code that the cursor is in hyperspace and
410
	 * let the next mvcur() call straighten things out.
411
	 */
412
	SP->_curscol = -1;
413
	SP->_cursrow = -1;
414
    } else if (auto_right_margin) {
415
	SP->_curscol = 0;
416
	SP->_cursrow++;
417
	/*
418
	 * We've actually moved - but may have to work around problems with
419
	 * video attributes not working.
420
	 */
421
	if (!move_standout_mode && AttrOf(SCREEN_ATTRS(SP))) {
422
	    TR(TRACE_CHARPUT, ("turning off (%#lx) %s before wrapping",
423
			       (unsigned long) AttrOf(SCREEN_ATTRS(SP)),
424
			       _traceattr(AttrOf(SCREEN_ATTRS(SP)))));
425
	    (void) VIDATTR(A_NORMAL, 0);
426
	}
427
    } else {
428
	SP->_curscol--;
429
    }
430
    position_check(SP->_cursrow, SP->_curscol, "wrap_cursor");
431
}
432
433
static NCURSES_INLINE void
434
PutChar(const ARG_CH_T ch)
435
/* insert character, handling automargin stuff */
436
{
437
    if (SP->_cursrow == screen_lines - 1 && SP->_curscol == screen_columns - 1)
438
	PutCharLR(ch);
439
    else
440
	PutAttrChar(ch);
441
442
    if (SP->_curscol >= screen_columns)
443
	wrap_cursor();
444
445
    position_check(SP->_cursrow, SP->_curscol, "PutChar");
446
}
447
448
/*
449
 * Check whether the given character can be output by clearing commands.  This
450
 * includes test for being a space and not including any 'bad' attributes, such
451
 * as A_REVERSE.  All attribute flags which don't affect appearance of a space
452
 * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded.
453
 */
454
static NCURSES_INLINE bool
455
can_clear_with(ARG_CH_T ch)
456
{
457
    if (!back_color_erase && SP->_coloron) {
458
#if NCURSES_EXT_FUNCS
459
	int pair;
460
461
	if (!SP->_default_color)
462
	    return FALSE;
463
	if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK)
464
	    return FALSE;
465
	if ((pair = GetPair(CHDEREF(ch))) != 0) {
466
	    short fg, bg;
467
	    pair_content(pair, &fg, &bg);
468
	    if (fg != C_MASK || bg != C_MASK)
469
		return FALSE;
470
	}
471
#else
472
	if (AttrOfD(ch) & A_COLOR)
473
	    return FALSE;
474
#endif
475
    }
476
    return (ISBLANK(CHDEREF(ch)) &&
477
	    (AttrOfD(ch) & ~(NONBLANK_ATTR | A_COLOR)) == BLANK_ATTR);
478
}
479
480
/*
481
 * Issue a given span of characters from an array.
482
 * Must be functionally equivalent to:
483
 *	for (i = 0; i < num; i++)
484
 *	    PutChar(ntext[i]);
485
 * but can leave the cursor positioned at the middle of the interval.
486
 *
487
 * Returns: 0 - cursor is at the end of interval
488
 *	    1 - cursor is somewhere in the middle
489
 *
490
 * This code is optimized using ech and rep.
491
 */
492
static int
493
EmitRange(const NCURSES_CH_T * ntext, int num)
494
{
495
    int i;
496
497
    TR(TRACE_CHARPUT, ("EmitRange %d:%s", num, _nc_viscbuf(ntext, num)));
498
499
    if (erase_chars || repeat_char) {
500
	while (num > 0) {
501
	    int runcount;
502
	    NCURSES_CH_T ntext0;
503
504
	    while (num > 1 && !CharEq(ntext[0], ntext[1])) {
505
		PutChar(CHREF(ntext[0]));
506
		ntext++;
507
		num--;
508
	    }
509
	    ntext0 = ntext[0];
510
	    if (num == 1) {
511
		PutChar(CHREF(ntext0));
512
		return 0;
513
	    }
514
	    runcount = 2;
515
516
	    while (runcount < num && CharEq(ntext[runcount], ntext0))
517
		runcount++;
518
519
	    /*
520
	     * The cost expression in the middle isn't exactly right.
521
	     * _cup_ch_cost is an upper bound on the cost for moving to the
522
	     * end of the erased area, but not the cost itself (which we
523
	     * can't compute without emitting the move).  This may result
524
	     * in erase_chars not getting used in some situations for
525
	     * which it would be marginally advantageous.
526
	     */
527
	    if (erase_chars
528
		&& runcount > SP->_ech_cost + SP->_cup_ch_cost
529
		&& can_clear_with(CHREF(ntext0))) {
530
		UpdateAttrs(ntext0);
531
		putp(TPARM_1(erase_chars, runcount));
532
533
		/*
534
		 * If this is the last part of the given interval,
535
		 * don't bother moving cursor, since it can be the
536
		 * last update on the line.
537
		 */
538
		if (runcount < num) {
539
		    GoTo(SP->_cursrow, SP->_curscol + runcount);
540
		} else {
541
		    return 1;	/* cursor stays in the middle */
542
		}
543
	    } else if (repeat_char && runcount > SP->_rep_cost) {
544
		bool wrap_possible = (SP->_curscol + runcount >= screen_columns);
545
		int rep_count = runcount;
546
547
		if (wrap_possible)
548
		    rep_count--;
549
550
		UpdateAttrs(ntext0);
551
		tputs(TPARM_2(repeat_char, CharOf(ntext0), rep_count),
552
		      rep_count, _nc_outch);
553
		SP->_curscol += rep_count;
554
555
		if (wrap_possible)
556
		    PutChar(CHREF(ntext0));
557
	    } else {
558
		for (i = 0; i < runcount; i++)
559
		    PutChar(CHREF(ntext[i]));
560
	    }
561
	    ntext += runcount;
562
	    num -= runcount;
563
	}
564
	return 0;
565
    }
566
567
    for (i = 0; i < num; i++)
568
	PutChar(CHREF(ntext[i]));
569
    return 0;
570
}
571
572
/*
573
 * Output the line in the given range [first .. last]
574
 *
575
 * If there's a run of identical characters that's long enough to justify
576
 * cursor movement, use that also.
577
 *
578
 * Returns: same as EmitRange
579
 */
580
static int
581
PutRange(const NCURSES_CH_T * otext,
582
	 const NCURSES_CH_T * ntext,
583
	 int row,
584
	 int first, int last)
585
{
586
    int i, j, same;
587
588
    TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)",
589
		       otext, ntext, row, first, last));
590
591
    if (otext != ntext
592
	&& (last - first + 1) > SP->_inline_cost) {
593
	for (j = first, same = 0; j <= last; j++) {
594
	    if (!same && isWidecExt(otext[j]))
595
		continue;
596
	    if (CharEq(otext[j], ntext[j])) {
597
		same++;
598
	    } else {
599
		if (same > SP->_inline_cost) {
600
		    EmitRange(ntext + first, j - same - first);
601
		    GoTo(row, first = j);
602
		}
603
		same = 0;
604
	    }
605
	}
606
	i = EmitRange(ntext + first, j - same - first);
607
	/*
608
	 * Always return 1 for the next GoTo() after a PutRange() if we found
609
	 * identical characters at end of interval
610
	 */
611
	return (same == 0 ? i : 1);
612
    }
613
    return EmitRange(ntext + first, last - first + 1);
614
}
615
616
/* leave unbracketed here so 'indent' works */
617
#define MARK_NOCHANGE(win,row) \
618
		win->_line[row].firstchar = _NOCHANGE; \
619
		win->_line[row].lastchar = _NOCHANGE; \
620
		if_USE_SCROLL_HINTS(win->_line[row].oldindex = row)
621
622
NCURSES_EXPORT(int)
623
doupdate(void)
624
{
625
    int i;
626
    int nonempty;
627
#if USE_TRACE_TIMES
628
    struct tms before, after;
629
#endif /* USE_TRACE_TIMES */
630
631
    T((T_CALLED("doupdate()")));
632
633
    if (curscr == 0
634
	|| newscr == 0)
635
	returnCode(ERR);
636
637
#ifdef TRACE
638
    if (USE_TRACEF(TRACE_UPDATE)) {
639
	if (curscr->_clear)
640
	    _tracef("curscr is clear");
641
	else
642
	    _tracedump("curscr", curscr);
643
	_tracedump("newscr", newscr);
644
	_nc_unlock_global(tracef);
645
    }
646
#endif /* TRACE */
647
648
    _nc_signal_handler(FALSE);
649
650
    if (SP->_fifohold)
651
	SP->_fifohold--;
652
653
#if USE_SIZECHANGE
654
    if (SP->_endwin || _nc_handle_sigwinch(SP)) {
655
	/*
656
	 * This is a transparent extension:  XSI does not address it,
657
	 * and applications need not know that ncurses can do it.
658
	 *
659
	 * Check if the terminal size has changed while curses was off
660
	 * (this can happen in an xterm, for example), and resize the
661
	 * ncurses data structures accordingly.
662
	 */
663
	_nc_update_screensize(SP);
664
    }
665
#endif
666
667
    if (SP->_endwin) {
668
669
	T(("coming back from shell mode"));
670
	reset_prog_mode();
671
672
	_nc_mvcur_resume();
673
	_nc_screen_resume();
674
	SP->_mouse_resume(SP);
675
676
	SP->_endwin = FALSE;
677
    }
678
#if USE_TRACE_TIMES
679
    /* zero the metering machinery */
680
    RESET_OUTCHARS();
681
    (void) times(&before);
682
#endif /* USE_TRACE_TIMES */
683
684
    /*
685
     * This is the support for magic-cookie terminals.  The theory:  we scan
686
     * the virtual screen looking for attribute turnons.  Where we find one,
687
     * check to make sure it's realizable by seeing if the required number of
688
     * un-attributed blanks are present before and after the attributed range;
689
     * try to shift the range boundaries over blanks (not changing the screen
690
     * display) so this becomes true.  If it is, shift the beginning attribute
691
     * change appropriately (the end one, if we've gotten this far, is
692
     * guaranteed room for its cookie).  If not, nuke the added attributes out
693
     * of the span.
694
     */
695
#if USE_XMC_SUPPORT
696
    if (magic_cookie_glitch > 0) {
697
	int j, k;
698
	attr_t rattr = A_NORMAL;
699
700
	for (i = 0; i < screen_lines; i++) {
701
	    for (j = 0; j < screen_columns; j++) {
702
		bool failed = FALSE;
703
		NCURSES_CH_T *thisline = newscr->_line[i].text;
704
		attr_t thisattr = AttrOf(thisline[j]) & SP->_xmc_triggers;
705
		attr_t turnon = thisattr & ~rattr;
706
707
		/* is an attribute turned on here? */
708
		if (turnon == 0) {
709
		    rattr = thisattr;
710
		    continue;
711
		}
712
713
		TR(TRACE_ATTRS, ("At (%d, %d): from %s...", i, j, _traceattr(rattr)));
714
		TR(TRACE_ATTRS, ("...to %s", _traceattr(turnon)));
715
716
		/*
717
		 * If the attribute change location is a blank with a "safe"
718
		 * attribute, undo the attribute turnon.  This may ensure
719
		 * there's enough room to set the attribute before the first
720
		 * non-blank in the run.
721
		 */
722
#define SAFE(a)	(!((a) & SP->_xmc_triggers))
723
		if (ISBLANK(thisline[j]) && SAFE(turnon)) {
724
		    RemAttr(thisline[j], turnon);
725
		    continue;
726
		}
727
728
		/* check that there's enough room at start of span */
729
		for (k = 1; k <= magic_cookie_glitch; k++) {
730
		    if (j - k < 0
731
			|| !ISBLANK(thisline[j - k])
732
			|| !SAFE(AttrOf(thisline[j - k]))) {
733
			failed = TRUE;
734
			TR(TRACE_ATTRS, ("No room at start in %d,%d%s%s",
735
					 i, j - k,
736
					 (ISBLANK(thisline[j - k])
737
					  ? ""
738
					  : ":nonblank"),
739
					 (SAFE(AttrOf(thisline[j - k]))
740
					  ? ""
741
					  : ":unsafe")));
742
			break;
743
		    }
744
		}
745
		if (!failed) {
746
		    bool end_onscreen = FALSE;
747
		    int m, n = j;
748
749
		    /* find end of span, if it's onscreen */
750
		    for (m = i; m < screen_lines; m++) {
751
			for (; n < screen_columns; n++) {
752
			    attr_t testattr = AttrOf(newscr->_line[m].text[n]);
753
			    if ((testattr & SP->_xmc_triggers) == rattr) {
754
				end_onscreen = TRUE;
755
				TR(TRACE_ATTRS,
756
				   ("Range attributed with %s ends at (%d, %d)",
757
				    _traceattr(turnon), m, n));
758
				goto foundit;
759
			    }
760
			}
761
			n = 0;
762
		    }
763
		    TR(TRACE_ATTRS,
764
		       ("Range attributed with %s ends offscreen",
765
			_traceattr(turnon)));
766
		  foundit:;
767
768
		    if (end_onscreen) {
769
			NCURSES_CH_T *lastline = newscr->_line[m].text;
770
771
			/*
772
			 * If there are safely-attributed blanks at the end of
773
			 * the range, shorten the range.  This will help ensure
774
			 * that there is enough room at end of span.
775
			 */
776
			while (n >= 0
777
			       && ISBLANK(lastline[n])
778
			       && SAFE(AttrOf(lastline[n]))) {
779
			    RemAttr(lastline[n--], turnon);
780
			}
781
782
			/* check that there's enough room at end of span */
783
			for (k = 1; k <= magic_cookie_glitch; k++) {
784
			    if (n + k >= screen_columns
785
				|| !ISBLANK(lastline[n + k])
786
				|| !SAFE(AttrOf(lastline[n + k]))) {
787
				failed = TRUE;
788
				TR(TRACE_ATTRS,
789
				   ("No room at end in %d,%d%s%s",
790
				    i, j - k,
791
				    (ISBLANK(lastline[n + k])
792
				     ? ""
793
				     : ":nonblank"),
794
				    (SAFE(AttrOf(lastline[n + k]))
795
				     ? ""
796
				     : ":unsafe")));
797
				break;
798
			    }
799
			}
800
		    }
801
		}
802
803
		if (failed) {
804
		    int p, q = j;
805
806
		    TR(TRACE_ATTRS,
807
		       ("Clearing %s beginning at (%d, %d)",
808
			_traceattr(turnon), i, j));
809
810
		    /* turn off new attributes over span */
811
		    for (p = i; p < screen_lines; p++) {
812
			for (; q < screen_columns; q++) {
813
			    attr_t testattr = AttrOf(newscr->_line[p].text[q]);
814
			    if ((testattr & SP->_xmc_triggers) == rattr)
815
				goto foundend;
816
			    RemAttr(newscr->_line[p].text[q], turnon);
817
			}
818
			q = 0;
819
		    }
820
		  foundend:;
821
		} else {
822
		    TR(TRACE_ATTRS,
823
		       ("Cookie space for %s found before (%d, %d)",
824
			_traceattr(turnon), i, j));
825
826
		    /*
827
		     * Back up the start of range so there's room for cookies
828
		     * before the first nonblank character.
829
		     */
830
		    for (k = 1; k <= magic_cookie_glitch; k++)
831
			AddAttr(thisline[j - k], turnon);
832
		}
833
834
		rattr = thisattr;
835
	    }
836
	}
837
838
#ifdef TRACE
839
	/* show altered highlights after magic-cookie check */
840
	if (USE_TRACEF(TRACE_UPDATE)) {
841
	    _tracef("After magic-cookie check...");
842
	    _tracedump("newscr", newscr);
843
	    _nc_unlock_global(tracef);
844
	}
845
#endif /* TRACE */
846
    }
847
#endif /* USE_XMC_SUPPORT */
848
849
    nonempty = 0;
850
    if (curscr->_clear || newscr->_clear) {	/* force refresh ? */
851
	ClrUpdate();
852
	curscr->_clear = FALSE;	/* reset flag */
853
	newscr->_clear = FALSE;	/* reset flag */
854
    } else {
855
	int changedlines = CHECK_INTERVAL;
856
857
	if (check_pending())
858
	    goto cleanup;
859
860
	nonempty = min(screen_lines, newscr->_maxy + 1);
861
862
	if (SP->_scrolling) {
863
	    _nc_scroll_optimize();
864
	}
865
866
	nonempty = ClrBottom(nonempty);
867
868
	TR(TRACE_UPDATE, ("Transforming lines, nonempty %d", nonempty));
869
	for (i = 0; i < nonempty; i++) {
870
	    /*
871
	     * Here is our line-breakout optimization.
872
	     */
873
	    if (changedlines == CHECK_INTERVAL) {
874
		if (check_pending())
875
		    goto cleanup;
876
		changedlines = 0;
877
	    }
878
879
	    /*
880
	     * newscr->line[i].firstchar is normally set
881
	     * by wnoutrefresh.  curscr->line[i].firstchar
882
	     * is normally set by _nc_scroll_window in the
883
	     * vertical-movement optimization code,
884
	     */
885
	    if (newscr->_line[i].firstchar != _NOCHANGE
886
		|| curscr->_line[i].firstchar != _NOCHANGE) {
887
		TransformLine(i);
888
		changedlines++;
889
	    }
890
891
	    /* mark line changed successfully */
892
	    if (i <= newscr->_maxy) {
893
		MARK_NOCHANGE(newscr, i);
894
	    }
895
	    if (i <= curscr->_maxy) {
896
		MARK_NOCHANGE(curscr, i);
897
	    }
898
	}
899
    }
900
901
    /* put everything back in sync */
902
    for (i = nonempty; i <= newscr->_maxy; i++) {
903
	MARK_NOCHANGE(newscr, i);
904
    }
905
    for (i = nonempty; i <= curscr->_maxy; i++) {
906
	MARK_NOCHANGE(curscr, i);
907
    }
908
909
    if (!newscr->_leaveok) {
910
	curscr->_curx = newscr->_curx;
911
	curscr->_cury = newscr->_cury;
912
913
	GoTo(curscr->_cury, curscr->_curx);
914
    }
915
916
  cleanup:
917
    /*
918
     * We would like to keep the physical screen in normal mode in case we get
919
     * other processes writing to the screen.  This goal cannot be met for
920
     * magic cookies since it interferes with attributes that may propagate
921
     * past the current position.
922
     */
923
#if USE_XMC_SUPPORT
924
    if (magic_cookie_glitch != 0)
925
#endif
926
	UpdateAttrs(normal);
927
928
    _nc_flush();
929
    WINDOW_ATTRS(curscr) = WINDOW_ATTRS(newscr);
930
931
#if USE_TRACE_TIMES
932
    (void) times(&after);
933
    TR(TRACE_TIMES,
934
       ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time",
935
	_nc_outchars,
936
	(long) (after.tms_stime - before.tms_stime),
937
	(long) (after.tms_utime - before.tms_utime)));
938
#endif /* USE_TRACE_TIMES */
939
940
    _nc_signal_handler(TRUE);
941
942
    returnCode(OK);
943
}
944
945
/*
946
 *	ClrBlank(win)
947
 *
948
 *	Returns the attributed character that corresponds to the "cleared"
949
 *	screen.  If the terminal has the back-color-erase feature, this will be
950
 *	colored according to the wbkgd() call.
951
 *
952
 *	We treat 'curscr' specially because it isn't supposed to be set directly
953
 *	in the wbkgd() call.  Assume 'stdscr' for this case.
954
 */
955
#define BCE_ATTRS (A_NORMAL|A_COLOR)
956
#define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_nc_bkgd)
957
958
static NCURSES_INLINE NCURSES_CH_T
959
ClrBlank(WINDOW *win)
960
{
961
    NCURSES_CH_T blank = blankchar;
962
    if (back_color_erase)
963
	AddAttr(blank, (AttrOf(BCE_BKGD(win)) & BCE_ATTRS));
964
    return blank;
965
}
966
967
/*
968
**	ClrUpdate()
969
**
970
**	Update by clearing and redrawing the entire screen.
971
**
972
*/
973
974
static void
975
ClrUpdate(void)
976
{
977
    int i;
978
    NCURSES_CH_T blank = ClrBlank(stdscr);
979
    int nonempty = min(screen_lines, newscr->_maxy + 1);
980
981
    TR(TRACE_UPDATE, (T_CALLED("ClrUpdate")));
982
983
    ClearScreen(blank);
984
985
    TR(TRACE_UPDATE, ("updating screen from scratch"));
986
987
    nonempty = ClrBottom(nonempty);
988
989
    for (i = 0; i < nonempty; i++)
990
	TransformLine(i);
991
992
    TR(TRACE_UPDATE, (T_RETURN("")));
993
}
994
995
/*
996
**	ClrToEOL(blank)
997
**
998
**	Clear to end of current line, starting at the cursor position
999
*/
1000
1001
static void
1002
ClrToEOL(NCURSES_CH_T blank, bool needclear)
1003
{
1004
    int j;
1005
1006
    if (curscr != 0
1007
	&& SP->_cursrow >= 0) {
1008
	for (j = SP->_curscol; j < screen_columns; j++) {
1009
	    if (j >= 0) {
1010
		NCURSES_CH_T *cp = &(curscr->_line[SP->_cursrow].text[j]);
1011
1012
		if (!CharEq(*cp, blank)) {
1013
		    *cp = blank;
1014
		    needclear = TRUE;
1015
		}
1016
	    }
1017
	}
1018
    } else {
1019
	needclear = TRUE;
1020
    }
1021
1022
    if (needclear) {
1023
	UpdateAttrs(blank);
1024
	TPUTS_TRACE("clr_eol");
1025
	if (clr_eol && SP->_el_cost <= (screen_columns - SP->_curscol)) {
1026
	    putp(clr_eol);
1027
	} else {
1028
	    int count = (screen_columns - SP->_curscol);
1029
	    while (count-- > 0)
1030
		PutChar(CHREF(blank));
1031
	}
1032
    }
1033
}
1034
1035
/*
1036
**	ClrToEOS(blank)
1037
**
1038
**	Clear to end of screen, starting at the cursor position
1039
*/
1040
1041
static void
1042
ClrToEOS(NCURSES_CH_T blank)
1043
{
1044
    int row, col;
1045
1046
    row = SP->_cursrow;
1047
    col = SP->_curscol;
1048
1049
    UpdateAttrs(blank);
1050
    TPUTS_TRACE("clr_eos");
1051
    tputs(clr_eos, screen_lines - row, _nc_outch);
1052
1053
    while (col < screen_columns)
1054
	curscr->_line[row].text[col++] = blank;
1055
1056
    for (row++; row < screen_lines; row++) {
1057
	for (col = 0; col < screen_columns; col++)
1058
	    curscr->_line[row].text[col] = blank;
1059
    }
1060
}
1061
1062
/*
1063
 *	ClrBottom(total)
1064
 *
1065
 *	Test if clearing the end of the screen would satisfy part of the
1066
 *	screen-update.  Do this by scanning backwards through the lines in the
1067
 *	screen, checking if each is blank, and one or more are changed.
1068
 */
1069
static int
1070
ClrBottom(int total)
1071
{
1072
    int row;
1073
    int col;
1074
    int top = total;
1075
    int last = min(screen_columns, newscr->_maxx + 1);
1076
    NCURSES_CH_T blank = newscr->_line[total - 1].text[last - 1];
1077
    bool ok;
1078
1079
    if (clr_eos && can_clear_with(CHREF(blank))) {
1080
1081
	for (row = total - 1; row >= 0; row--) {
1082
	    for (col = 0, ok = TRUE; ok && col < last; col++) {
1083
		ok = (CharEq(newscr->_line[row].text[col], blank));
1084
	    }
1085
	    if (!ok)
1086
		break;
1087
1088
	    for (col = 0; ok && col < last; col++) {
1089
		ok = (CharEq(curscr->_line[row].text[col], blank));
1090
	    }
1091
	    if (!ok)
1092
		top = row;
1093
	}
1094
1095
	/* don't use clr_eos for just one line if clr_eol available */
1096
	if (top < total) {
1097
	    GoTo(top, 0);
1098
	    ClrToEOS(blank);
1099
	    if (SP->oldhash && SP->newhash) {
1100
		for (row = top; row < screen_lines; row++)
1101
		    SP->oldhash[row] = SP->newhash[row];
1102
	    }
1103
	}
1104
    }
1105
    return top;
1106
}
1107
1108
#if USE_XMC_SUPPORT
1109
#if USE_WIDEC_SUPPORT
1110
#define check_xmc_transition(a, b) \
1111
    ((((a)->attr ^ (b)->attr) & ~((a)->attr) & SP->_xmc_triggers) != 0)
1112
#define xmc_turn_on(a,b) check_xmc_transition(&(a), &(b))
1113
#else
1114
#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0)
1115
#endif
1116
1117
#define xmc_new(r,c) newscr->_line[r].text[c]
1118
#define xmc_turn_off(a,b) xmc_turn_on(b,a)
1119
#endif /* USE_XMC_SUPPORT */
1120
1121
/*
1122
**	TransformLine(lineno)
1123
**
1124
**	Transform the given line in curscr to the one in newscr, using
1125
**	Insert/Delete Character if _nc_idcok && has_ic().
1126
**
1127
**		firstChar = position of first different character in line
1128
**		oLastChar = position of last different character in old line
1129
**		nLastChar = position of last different character in new line
1130
**
1131
**		move to firstChar
1132
**		overwrite chars up to min(oLastChar, nLastChar)
1133
**		if oLastChar < nLastChar
1134
**			insert newLine[oLastChar+1..nLastChar]
1135
**		else
1136
**			delete oLastChar - nLastChar spaces
1137
*/
1138
1139
static void
1140
TransformLine(int const lineno)
1141
{
1142
    int firstChar, oLastChar, nLastChar;
1143
    NCURSES_CH_T *newLine = newscr->_line[lineno].text;
1144
    NCURSES_CH_T *oldLine = curscr->_line[lineno].text;
1145
    int n;
1146
    bool attrchanged = FALSE;
1147
1148
    TR(TRACE_UPDATE, (T_CALLED("TransformLine(%d)"), lineno));
1149
1150
    /* copy new hash value to old one */
1151
    if (SP->oldhash && SP->newhash)
1152
	SP->oldhash[lineno] = SP->newhash[lineno];
1153
1154
    /*
1155
     * If we have colors, there is the possibility of having two color pairs
1156
     * that display as the same colors.  For instance, Lynx does this.  Check
1157
     * for this case, and update the old line with the new line's colors when
1158
     * they are equivalent.
1159
     */
1160
    if (SP->_coloron) {
1161
	int oldPair;
1162
	int newPair;
1163
1164
	for (n = 0; n < screen_columns; n++) {
1165
	    if (!CharEq(newLine[n], oldLine[n])) {
1166
		oldPair = GetPair(oldLine[n]);
1167
		newPair = GetPair(newLine[n]);
1168
		if (oldPair != newPair
1169
		    && unColor(oldLine[n]) == unColor(newLine[n])) {
1170
		    if (oldPair < COLOR_PAIRS
1171
			&& newPair < COLOR_PAIRS
1172
			&& SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) {
1173
			SetPair(oldLine[n], GetPair(newLine[n]));
1174
		    }
1175
		}
1176
	    }
1177
	}
1178
    }
1179
1180
    if (ceol_standout_glitch && clr_eol) {
1181
	firstChar = 0;
1182
	while (firstChar < screen_columns) {
1183
	    if (!SameAttrOf(newLine[firstChar], oldLine[firstChar])) {
1184
		attrchanged = TRUE;
1185
		break;
1186
	    }
1187
	    firstChar++;
1188
	}
1189
    }
1190
1191
    firstChar = 0;
1192
1193
    if (attrchanged) {		/* we may have to disregard the whole line */
1194
	GoTo(lineno, firstChar);
1195
	ClrToEOL(ClrBlank(curscr), FALSE);
1196
	PutRange(oldLine, newLine, lineno, 0, (screen_columns - 1));
1197
#if USE_XMC_SUPPORT
1198
1199
	/*
1200
	 * This is a very simple loop to paint characters which may have the
1201
	 * magic cookie glitch embedded.  It doesn't know much about video
1202
	 * attributes which are continued from one line to the next.  It
1203
	 * assumes that we have filtered out requests for attribute changes
1204
	 * that do not get mapped to blank positions.
1205
	 *
1206
	 * FIXME: we are not keeping track of where we put the cookies, so this
1207
	 * will work properly only once, since we may overwrite a cookie in a
1208
	 * following operation.
1209
	 */
1210
    } else if (magic_cookie_glitch > 0) {
1211
	GoTo(lineno, firstChar);
1212
	for (n = 0; n < screen_columns; n++) {
1213
	    int m = n + magic_cookie_glitch;
1214
1215
	    /* check for turn-on:
1216
	     * If we are writing an attributed blank, where the
1217
	     * previous cell is not attributed.
1218
	     */
1219
	    if (ISBLANK(newLine[n])
1220
		&& ((n > 0
1221
		     && xmc_turn_on(newLine[n - 1], newLine[n]))
1222
		    || (n == 0
1223
			&& lineno > 0
1224
			&& xmc_turn_on(xmc_new(lineno - 1, screen_columns - 1),
1225
				       newLine[n])))) {
1226
		n = m;
1227
	    }
1228
1229
	    PutChar(CHREF(newLine[n]));
1230
1231
	    /* check for turn-off:
1232
	     * If we are writing an attributed non-blank, where the
1233
	     * next cell is blank, and not attributed.
1234
	     */
1235
	    if (!ISBLANK(newLine[n])
1236
		&& ((n + 1 < screen_columns
1237
		     && xmc_turn_off(newLine[n], newLine[n + 1]))
1238
		    || (n + 1 >= screen_columns
1239
			&& lineno + 1 < screen_lines
1240
			&& xmc_turn_off(newLine[n], xmc_new(lineno + 1, 0))))) {
1241
		n = m;
1242
	    }
1243
1244
	}
1245
#endif
1246
    } else {
1247
	NCURSES_CH_T blank;
1248
1249
	/* it may be cheap to clear leading whitespace with clr_bol */
1250
	blank = newLine[0];
1251
	if (clr_bol && can_clear_with(CHREF(blank))) {
1252
	    int oFirstChar, nFirstChar;
1253
1254
	    for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++)
1255
		if (!CharEq(oldLine[oFirstChar], blank))
1256
		    break;
1257
	    for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++)
1258
		if (!CharEq(newLine[nFirstChar], blank))
1259
		    break;
1260
1261
	    if (nFirstChar == oFirstChar) {
1262
		firstChar = nFirstChar;
1263
		/* find the first differing character */
1264
		while (firstChar < screen_columns
1265
		       && CharEq(newLine[firstChar], oldLine[firstChar]))
1266
		    firstChar++;
1267
	    } else if (oFirstChar > nFirstChar) {
1268
		firstChar = nFirstChar;
1269
	    } else {		/* oFirstChar < nFirstChar */
1270
		firstChar = oFirstChar;
1271
		if (SP->_el1_cost < nFirstChar - oFirstChar) {
1272
		    if (nFirstChar >= screen_columns
1273
			&& SP->_el_cost <= SP->_el1_cost) {
1274
			GoTo(lineno, 0);
1275
			UpdateAttrs(blank);
1276
			TPUTS_TRACE("clr_eol");
1277
			putp(clr_eol);
1278
		    } else {
1279
			GoTo(lineno, nFirstChar - 1);
1280
			UpdateAttrs(blank);
1281
			TPUTS_TRACE("clr_bol");
1282
			putp(clr_bol);
1283
		    }
1284
1285
		    while (firstChar < nFirstChar)
1286
			oldLine[firstChar++] = blank;
1287
		}
1288
	    }
1289
	} else {
1290
	    /* find the first differing character */
1291
	    while (firstChar < screen_columns
1292
		   && CharEq(newLine[firstChar], oldLine[firstChar]))
1293
		firstChar++;
1294
	}
1295
	/* if there wasn't one, we're done */
1296
	if (firstChar >= screen_columns) {
1297
	    TR(TRACE_UPDATE, (T_RETURN("")));
1298
	    return;
1299
	}
1300
1301
	blank = newLine[screen_columns - 1];
1302
1303
	if (!can_clear_with(CHREF(blank))) {
1304
	    /* find the last differing character */
1305
	    nLastChar = screen_columns - 1;
1306
1307
	    while (nLastChar > firstChar
1308
		   && CharEq(newLine[nLastChar], oldLine[nLastChar]))
1309
		nLastChar--;
1310
1311
	    if (nLastChar >= firstChar) {
1312
		GoTo(lineno, firstChar);
1313
		PutRange(oldLine, newLine, lineno, firstChar, nLastChar);
1314
		memcpy(oldLine + firstChar,
1315
		       newLine + firstChar,
1316
		       (nLastChar - firstChar + 1) * sizeof(NCURSES_CH_T));
1317
	    }
1318
	    TR(TRACE_UPDATE, (T_RETURN("")));
1319
	    return;
1320
	}
1321
1322
	/* find last non-blank character on old line */
1323
	oLastChar = screen_columns - 1;
1324
	while (oLastChar > firstChar && CharEq(oldLine[oLastChar], blank))
1325
	    oLastChar--;
1326
1327
	/* find last non-blank character on new line */
1328
	nLastChar = screen_columns - 1;
1329
	while (nLastChar > firstChar && CharEq(newLine[nLastChar], blank))
1330
	    nLastChar--;
1331
1332
	if ((nLastChar == firstChar)
1333
	    && (SP->_el_cost < (oLastChar - nLastChar))) {
1334
	    GoTo(lineno, firstChar);
1335
	    if (!CharEq(newLine[firstChar], blank))
1336
		PutChar(CHREF(newLine[firstChar]));
1337
	    ClrToEOL(blank, FALSE);
1338
	} else if ((nLastChar != oLastChar)
1339
		   && (!CharEq(newLine[nLastChar], oldLine[oLastChar])
1340
		       || !(_nc_idcok && has_ic()))) {
1341
	    GoTo(lineno, firstChar);
1342
	    if ((oLastChar - nLastChar) > SP->_el_cost) {
1343
		if (PutRange(oldLine, newLine, lineno, firstChar, nLastChar))
1344
		    GoTo(lineno, nLastChar + 1);
1345
		ClrToEOL(blank, FALSE);
1346
	    } else {
1347
		n = max(nLastChar, oLastChar);
1348
		PutRange(oldLine, newLine, lineno, firstChar, n);
1349
	    }
1350
	} else {
1351
	    int nLastNonblank = nLastChar;
1352
	    int oLastNonblank = oLastChar;
1353
1354
	    /* find the last characters that really differ */
1355
	    /* can be -1 if no characters differ */
1356
	    while (CharEq(newLine[nLastChar], oldLine[oLastChar])) {
1357
		/* don't split a wide char */
1358
		if (isWidecExt(newLine[nLastChar]) &&
1359
		    !CharEq(newLine[nLastChar - 1], oldLine[oLastChar - 1]))
1360
		    break;
1361
		nLastChar--;
1362
		oLastChar--;
1363
		if (nLastChar == -1 || oLastChar == -1)
1364
		    break;
1365
	    }
1366
1367
	    n = min(oLastChar, nLastChar);
1368
	    if (n >= firstChar) {
1369
		GoTo(lineno, firstChar);
1370
		PutRange(oldLine, newLine, lineno, firstChar, n);
1371
	    }
1372
1373
	    if (oLastChar < nLastChar) {
1374
		int m = max(nLastNonblank, oLastNonblank);
1375
#if USE_WIDEC_SUPPORT
1376
		while (isWidecExt(newLine[n + 1]) && n) {
1377
		    --n;
1378
		    --oLastChar;
1379
		}
1380
#endif
1381
		GoTo(lineno, n + 1);
1382
		if ((nLastChar < nLastNonblank)
1383
		    || InsCharCost(nLastChar - oLastChar) > (m - n)) {
1384
		    PutRange(oldLine, newLine, lineno, n + 1, m);
1385
		} else {
1386
		    InsStr(&newLine[n + 1], nLastChar - oLastChar);
1387
		}
1388
	    } else if (oLastChar > nLastChar) {
1389
		GoTo(lineno, n + 1);
1390
		if (DelCharCost(oLastChar - nLastChar)
1391
		    > SP->_el_cost + nLastNonblank - (n + 1)) {
1392
		    if (PutRange(oldLine, newLine, lineno,
1393
				 n + 1, nLastNonblank))
1394
			GoTo(lineno, nLastNonblank + 1);
1395
		    ClrToEOL(blank, FALSE);
1396
		} else {
1397
		    /*
1398
		     * The delete-char sequence will
1399
		     * effectively shift in blanks from the
1400
		     * right margin of the screen.  Ensure
1401
		     * that they are the right color by
1402
		     * setting the video attributes from
1403
		     * the last character on the row.
1404
		     */
1405
		    UpdateAttrs(blank);
1406
		    DelChar(oLastChar - nLastChar);
1407
		}
1408
	    }
1409
	}
1410
    }
1411
1412
    /* update the code's internal representation */
1413
    if (screen_columns > firstChar)
1414
	memcpy(oldLine + firstChar,
1415
	       newLine + firstChar,
1416
	       (screen_columns - firstChar) * sizeof(NCURSES_CH_T));
1417
    TR(TRACE_UPDATE, (T_RETURN("")));
1418
    return;
1419
}
1420
1421
/*
1422
**	ClearScreen(blank)
1423
**
1424
**	Clear the physical screen and put cursor at home
1425
**
1426
*/
1427
1428
static void
1429
ClearScreen(NCURSES_CH_T blank)
1430
{
1431
    int i, j;
1432
    bool fast_clear = (clear_screen || clr_eos || clr_eol);
1433
1434
    TR(TRACE_UPDATE, ("ClearScreen() called"));
1435
1436
#if NCURSES_EXT_FUNCS
1437
    if (SP->_coloron
1438
	&& !SP->_default_color) {
1439
	_nc_do_color(GET_SCREEN_PAIR(SP), 0, FALSE, _nc_outch);
1440
	if (!back_color_erase) {
1441
	    fast_clear = FALSE;
1442
	}
1443
    }
1444
#endif
1445
1446
    if (fast_clear) {
1447
	if (clear_screen) {
1448
	    UpdateAttrs(blank);
1449
	    TPUTS_TRACE("clear_screen");
1450
	    putp(clear_screen);
1451
	    SP->_cursrow = SP->_curscol = 0;
1452
	    position_check(SP->_cursrow, SP->_curscol, "ClearScreen");
1453
	} else if (clr_eos) {
1454
	    SP->_cursrow = SP->_curscol = -1;
1455
	    GoTo(0, 0);
1456
1457
	    UpdateAttrs(blank);
1458
	    TPUTS_TRACE("clr_eos");
1459
	    tputs(clr_eos, screen_lines, _nc_outch);
1460
	} else if (clr_eol) {
1461
	    SP->_cursrow = SP->_curscol = -1;
1462
1463
	    UpdateAttrs(blank);
1464
	    for (i = 0; i < screen_lines; i++) {
1465
		GoTo(i, 0);
1466
		TPUTS_TRACE("clr_eol");
1467
		putp(clr_eol);
1468
	    }
1469
	    GoTo(0, 0);
1470
	}
1471
    } else {
1472
	UpdateAttrs(blank);
1473
	for (i = 0; i < screen_lines; i++) {
1474
	    GoTo(i, 0);
1475
	    for (j = 0; j < screen_columns; j++)
1476
		PutChar(CHREF(blank));
1477
	}
1478
	GoTo(0, 0);
1479
    }
1480
1481
    for (i = 0; i < screen_lines; i++) {
1482
	for (j = 0; j < screen_columns; j++)
1483
	    curscr->_line[i].text[j] = blank;
1484
    }
1485
1486
    TR(TRACE_UPDATE, ("screen cleared"));
1487
}
1488
1489
/*
1490
**	InsStr(line, count)
1491
**
1492
**	Insert the count characters pointed to by line.
1493
**
1494
*/
1495
1496
static void
1497
InsStr(NCURSES_CH_T * line, int count)
1498
{
1499
    TR(TRACE_UPDATE, ("InsStr(%p,%d) called", line, count));
1500
1501
    /* Prefer parm_ich as it has the smallest cost - no need to shift
1502
     * the whole line on each character. */
1503
    /* The order must match that of InsCharCost. */
1504
    if (parm_ich) {
1505
	TPUTS_TRACE("parm_ich");
1506
	tputs(TPARM_1(parm_ich, count), count, _nc_outch);
1507
	while (count) {
1508
	    PutAttrChar(CHREF(*line));
1509
	    line++;
1510
	    count--;
1511
	}
1512
    } else if (enter_insert_mode && exit_insert_mode) {
1513
	TPUTS_TRACE("enter_insert_mode");
1514
	putp(enter_insert_mode);
1515
	while (count) {
1516
	    PutAttrChar(CHREF(*line));
1517
	    if (insert_padding) {
1518
		TPUTS_TRACE("insert_padding");
1519
		putp(insert_padding);
1520
	    }
1521
	    line++;
1522
	    count--;
1523
	}
1524
	TPUTS_TRACE("exit_insert_mode");
1525
	putp(exit_insert_mode);
1526
    } else {
1527
	while (count) {
1528
	    TPUTS_TRACE("insert_character");
1529
	    putp(insert_character);
1530
	    PutAttrChar(CHREF(*line));
1531
	    if (insert_padding) {
1532
		TPUTS_TRACE("insert_padding");
1533
		putp(insert_padding);
1534
	    }
1535
	    line++;
1536
	    count--;
1537
	}
1538
    }
1539
    position_check(SP->_cursrow, SP->_curscol, "InsStr");
1540
}
1541
1542
/*
1543
**	DelChar(count)
1544
**
1545
**	Delete count characters at current position
1546
**
1547
*/
1548
1549
static void
1550
DelChar(int count)
1551
{
1552
    int n;
1553
1554
    TR(TRACE_UPDATE, ("DelChar(%d) called, position = (%ld,%ld)",
1555
		      count,
1556
		      (long) newscr->_cury,
1557
		      (long) newscr->_curx));
1558
1559
    if (parm_dch) {
1560
	TPUTS_TRACE("parm_dch");
1561
	tputs(TPARM_1(parm_dch, count), count, _nc_outch);
1562
    } else {
1563
	for (n = 0; n < count; n++) {
1564
	    TPUTS_TRACE("delete_character");
1565
	    putp(delete_character);
1566
	}
1567
    }
1568
}
1569
1570
/*
1571
 * Physical-scrolling support
1572
 *
1573
 * This code was adapted from Keith Bostic's hardware scrolling
1574
 * support for 4.4BSD curses.  I (esr) translated it to use terminfo
1575
 * capabilities, narrowed the call interface slightly, and cleaned
1576
 * up some convoluted tests.  I also added support for the memory_above
1577
 * memory_below, and non_dest_scroll_region capabilities.
1578
 *
1579
 * For this code to work, we must have either
1580
 * change_scroll_region and scroll forward/reverse commands, or
1581
 * insert and delete line capabilities.
1582
 * When the scrolling region has been set, the cursor has to
1583
 * be at the last line of the region to make the scroll up
1584
 * happen, or on the first line of region to scroll down.
1585
 *
1586
 * This code makes one aesthetic decision in the opposite way from
1587
 * BSD curses.  BSD curses preferred pairs of il/dl operations
1588
 * over scrolls, allegedly because il/dl looked faster.  We, on
1589
 * the other hand, prefer scrolls because (a) they're just as fast
1590
 * on many terminals and (b) using them avoids bouncing an
1591
 * unchanged bottom section of the screen up and down, which is
1592
 * visually nasty.
1593
 *
1594
 * (lav): added more cases, used dl/il when bot==maxy and in csr case.
1595
 *
1596
 * I used assumption that capabilities il/il1/dl/dl1 work inside
1597
 * changed scroll region not shifting screen contents outside of it.
1598
 * If there are any terminals behaving different way, it would be
1599
 * necessary to add some conditions to scroll_csr_forward/backward.
1600
 */
1601
1602
/* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */
1603
static int
1604
scroll_csr_forward(int n, int top, int bot, int miny, int maxy, NCURSES_CH_T blank)
1605
{
1606
    int i;
1607
1608
    if (n == 1 && scroll_forward && top == miny && bot == maxy) {
1609
	GoTo(bot, 0);
1610
	UpdateAttrs(blank);
1611
	TPUTS_TRACE("scroll_forward");
1612
	putp(scroll_forward);
1613
    } else if (n == 1 && delete_line && bot == maxy) {
1614
	GoTo(top, 0);
1615
	UpdateAttrs(blank);
1616
	TPUTS_TRACE("delete_line");
1617
	putp(delete_line);
1618
    } else if (parm_index && top == miny && bot == maxy) {
1619
	GoTo(bot, 0);
1620
	UpdateAttrs(blank);
1621
	TPUTS_TRACE("parm_index");
1622
	tputs(TPARM_2(parm_index, n, 0), n, _nc_outch);
1623
    } else if (parm_delete_line && bot == maxy) {
1624
	GoTo(top, 0);
1625
	UpdateAttrs(blank);
1626
	TPUTS_TRACE("parm_delete_line");
1627
	tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch);
1628
    } else if (scroll_forward && top == miny && bot == maxy) {
1629
	GoTo(bot, 0);
1630
	UpdateAttrs(blank);
1631
	for (i = 0; i < n; i++) {
1632
	    TPUTS_TRACE("scroll_forward");
1633
	    putp(scroll_forward);
1634
	}
1635
    } else if (delete_line && bot == maxy) {
1636
	GoTo(top, 0);
1637
	UpdateAttrs(blank);
1638
	for (i = 0; i < n; i++) {
1639
	    TPUTS_TRACE("delete_line");
1640
	    putp(delete_line);
1641
	}
1642
    } else
1643
	return ERR;
1644
1645
#if NCURSES_EXT_FUNCS
1646
    if (FILL_BCE()) {
1647
	int j;
1648
	for (i = 0; i < n; i++) {
1649
	    GoTo(bot - i, 0);
1650
	    for (j = 0; j < screen_columns; j++)
1651
		PutChar(CHREF(blank));
1652
	}
1653
    }
1654
#endif
1655
    return OK;
1656
}
1657
1658
/* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */
1659
/* n > 0 */
1660
static int
1661
scroll_csr_backward(int n, int top, int bot, int miny, int maxy,
1662
		    NCURSES_CH_T blank)
1663
{
1664
    int i;
1665
1666
    if (n == 1 && scroll_reverse && top == miny && bot == maxy) {
1667
	GoTo(top, 0);
1668
	UpdateAttrs(blank);
1669
	TPUTS_TRACE("scroll_reverse");
1670
	putp(scroll_reverse);
1671
    } else if (n == 1 && insert_line && bot == maxy) {
1672
	GoTo(top, 0);
1673
	UpdateAttrs(blank);
1674
	TPUTS_TRACE("insert_line");
1675
	putp(insert_line);
1676
    } else if (parm_rindex && top == miny && bot == maxy) {
1677
	GoTo(top, 0);
1678
	UpdateAttrs(blank);
1679
	TPUTS_TRACE("parm_rindex");
1680
	tputs(TPARM_2(parm_rindex, n, 0), n, _nc_outch);
1681
    } else if (parm_insert_line && bot == maxy) {
1682
	GoTo(top, 0);
1683
	UpdateAttrs(blank);
1684
	TPUTS_TRACE("parm_insert_line");
1685
	tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch);
1686
    } else if (scroll_reverse && top == miny && bot == maxy) {
1687
	GoTo(top, 0);
1688
	UpdateAttrs(blank);
1689
	for (i = 0; i < n; i++) {
1690
	    TPUTS_TRACE("scroll_reverse");
1691
	    putp(scroll_reverse);
1692
	}
1693
    } else if (insert_line && bot == maxy) {
1694
	GoTo(top, 0);
1695
	UpdateAttrs(blank);
1696
	for (i = 0; i < n; i++) {
1697
	    TPUTS_TRACE("insert_line");
1698
	    putp(insert_line);
1699
	}
1700
    } else
1701
	return ERR;
1702
1703
#if NCURSES_EXT_FUNCS
1704
    if (FILL_BCE()) {
1705
	int j;
1706
	for (i = 0; i < n; i++) {
1707
	    GoTo(top + i, 0);
1708
	    for (j = 0; j < screen_columns; j++)
1709
		PutChar(CHREF(blank));
1710
	}
1711
    }
1712
#endif
1713
    return OK;
1714
}
1715
1716
/* scroll by using delete_line at del and insert_line at ins */
1717
/* n > 0 */
1718
static int
1719
scroll_idl(int n, int del, int ins, NCURSES_CH_T blank)
1720
{
1721
    int i;
1722
1723
    if (!((parm_delete_line || delete_line) && (parm_insert_line || insert_line)))
1724
	return ERR;
1725
1726
    GoTo(del, 0);
1727
    UpdateAttrs(blank);
1728
    if (n == 1 && delete_line) {
1729
	TPUTS_TRACE("delete_line");
1730
	putp(delete_line);
1731
    } else if (parm_delete_line) {
1732
	TPUTS_TRACE("parm_delete_line");
1733
	tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch);
1734
    } else {			/* if (delete_line) */
1735
	for (i = 0; i < n; i++) {
1736
	    TPUTS_TRACE("delete_line");
1737
	    putp(delete_line);
1738
	}
1739
    }
1740
1741
    GoTo(ins, 0);
1742
    UpdateAttrs(blank);
1743
    if (n == 1 && insert_line) {
1744
	TPUTS_TRACE("insert_line");
1745
	putp(insert_line);
1746
    } else if (parm_insert_line) {
1747
	TPUTS_TRACE("parm_insert_line");
1748
	tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch);
1749
    } else {			/* if (insert_line) */
1750
	for (i = 0; i < n; i++) {
1751
	    TPUTS_TRACE("insert_line");
1752
	    putp(insert_line);
1753
	}
1754
    }
1755
1756
    return OK;
1757
}
1758
1759
/*
1760
 * Note:  some terminals require the cursor to be within the scrolling margins
1761
 * before setting them.  Generally, the cursor must be at the appropriate end
1762
 * of the scrolling margins when issuing an indexing operation (it is not
1763
 * apparent whether it must also be at the left margin; we do this just to be
1764
 * safe).  To make the related cursor movement a little faster, we use the
1765
 * save/restore cursor capabilities if the terminal has them.
1766
 */
1767
NCURSES_EXPORT(int)
1768
_nc_scrolln(int n, int top, int bot, int maxy)
1769
/* scroll region from top to bot by n lines */
1770
{
1771
    NCURSES_CH_T blank = ClrBlank(stdscr);
1772
    int i;
1773
    bool cursor_saved = FALSE;
1774
    int res;
1775
1776
    TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy));
1777
1778
#if USE_XMC_SUPPORT
1779
    /*
1780
     * If we scroll, we might remove a cookie.
1781
     */
1782
    if (magic_cookie_glitch > 0) {
1783
	return (ERR);
1784
    }
1785
#endif
1786
1787
    if (n > 0) {		/* scroll up (forward) */
1788
	/*
1789
	 * Explicitly clear if stuff pushed off top of region might
1790
	 * be saved by the terminal.
1791
	 */
1792
	res = scroll_csr_forward(n, top, bot, 0, maxy, blank);
1793
1794
	if (res == ERR && change_scroll_region) {
1795
	    if ((((n == 1 && scroll_forward) || parm_index)
1796
		 && (SP->_cursrow == bot || SP->_cursrow == bot - 1))
1797
		&& save_cursor && restore_cursor) {
1798
		cursor_saved = TRUE;
1799
		TPUTS_TRACE("save_cursor");
1800
		putp(save_cursor);
1801
	    }
1802
	    TPUTS_TRACE("change_scroll_region");
1803
	    putp(TPARM_2(change_scroll_region, top, bot));
1804
	    if (cursor_saved) {
1805
		TPUTS_TRACE("restore_cursor");
1806
		putp(restore_cursor);
1807
	    } else {
1808
		SP->_cursrow = SP->_curscol = -1;
1809
	    }
1810
1811
	    res = scroll_csr_forward(n, top, bot, top, bot, blank);
1812
1813
	    TPUTS_TRACE("change_scroll_region");
1814
	    putp(TPARM_2(change_scroll_region, 0, maxy));
1815
	    SP->_cursrow = SP->_curscol = -1;
1816
	}
1817
1818
	if (res == ERR && _nc_idlok)
1819
	    res = scroll_idl(n, top, bot - n + 1, blank);
1820
1821
	/*
1822
	 * Clear the newly shifted-in text.
1823
	 */
1824
	if (res != ERR
1825
	    && (non_dest_scroll_region || (memory_below && bot == maxy))) {
1826
	    static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT);
1827
	    if (bot == maxy && clr_eos) {
1828
		GoTo(bot - n + 1, 0);
1829
		ClrToEOS(blank2);
1830
	    } else {
1831
		for (i = 0; i < n; i++) {
1832
		    GoTo(bot - i, 0);
1833
		    ClrToEOL(blank2, FALSE);
1834
		}
1835
	    }
1836
	}
1837
1838
    } else {			/* (n < 0) - scroll down (backward) */
1839
	res = scroll_csr_backward(-n, top, bot, 0, maxy, blank);
1840
1841
	if (res == ERR && change_scroll_region) {
1842
	    if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top - 1)
1843
		&& save_cursor && restore_cursor) {
1844
		cursor_saved = TRUE;
1845
		TPUTS_TRACE("save_cursor");
1846
		putp(save_cursor);
1847
	    }
1848
	    TPUTS_TRACE("change_scroll_region");
1849
	    putp(TPARM_2(change_scroll_region, top, bot));
1850
	    if (cursor_saved) {
1851
		TPUTS_TRACE("restore_cursor");
1852
		putp(restore_cursor);
1853
	    } else {
1854
		SP->_cursrow = SP->_curscol = -1;
1855
	    }
1856
1857
	    res = scroll_csr_backward(-n, top, bot, top, bot, blank);
1858
1859
	    TPUTS_TRACE("change_scroll_region");
1860
	    putp(TPARM_2(change_scroll_region, 0, maxy));
1861
	    SP->_cursrow = SP->_curscol = -1;
1862
	}
1863
1864
	if (res == ERR && _nc_idlok)
1865
	    res = scroll_idl(-n, bot + n + 1, top, blank);
1866
1867
	/*
1868
	 * Clear the newly shifted-in text.
1869
	 */
1870
	if (res != ERR
1871
	    && (non_dest_scroll_region || (memory_above && top == 0))) {
1872
	    static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT);
1873
	    for (i = 0; i < -n; i++) {
1874
		GoTo(i + top, 0);
1875
		ClrToEOL(blank2, FALSE);
1876
	    }
1877
	}
1878
    }
1879
1880
    if (res == ERR)
1881
	return (ERR);
1882
1883
    _nc_scroll_window(curscr, n, top, bot, blank);
1884
1885
    /* shift hash values too - they can be reused */
1886
    _nc_scroll_oldhash(n, top, bot);
1887
1888
    return (OK);
1889
}
1890
1891
NCURSES_EXPORT(void)
1892
_nc_screen_resume(void)
1893
{
1894
    /* make sure terminal is in a sane known state */
1895
    SetAttr(SCREEN_ATTRS(SP), A_NORMAL);
1896
    newscr->_clear = TRUE;
1897
1898
    /* reset color pairs and definitions */
1899
    if (SP->_coloron || SP->_color_defs)
1900
	_nc_reset_colors();
1901
1902
    /* restore user-defined colors, if any */
1903
    if (SP->_color_defs < 0) {
1904
	int n;
1905
	SP->_color_defs = -(SP->_color_defs);
1906
	for (n = 0; n < SP->_color_defs; ++n) {
1907
	    if (SP->_color_table[n].init) {
1908
		init_color(n,
1909
			   SP->_color_table[n].r,
1910
			   SP->_color_table[n].g,
1911
			   SP->_color_table[n].b);
1912
	    }
1913
	}
1914
    }
1915
1916
    if (exit_attribute_mode)
1917
	putp(exit_attribute_mode);
1918
    else {
1919
	/* turn off attributes */
1920
	if (exit_alt_charset_mode)
1921
	    putp(exit_alt_charset_mode);
1922
	if (exit_standout_mode)
1923
	    putp(exit_standout_mode);
1924
	if (exit_underline_mode)
1925
	    putp(exit_underline_mode);
1926
    }
1927
    if (exit_insert_mode)
1928
	putp(exit_insert_mode);
1929
    if (enter_am_mode && exit_am_mode)
1930
	putp(auto_right_margin ? enter_am_mode : exit_am_mode);
1931
}
1932
1933
NCURSES_EXPORT(void)
1934
_nc_screen_init(void)
1935
{
1936
    _nc_screen_resume();
1937
}
1938
1939
/* wrap up screen handling */
1940
NCURSES_EXPORT(void)
1941
_nc_screen_wrap(void)
1942
{
1943
    UpdateAttrs(normal);
1944
#if NCURSES_EXT_FUNCS
1945
    if (SP->_coloron
1946
	&& !SP->_default_color) {
1947
	static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
1948
	SP->_default_color = TRUE;
1949
	_nc_do_color(-1, 0, FALSE, _nc_outch);
1950
	SP->_default_color = FALSE;
1951
1952
	mvcur(SP->_cursrow, SP->_curscol, screen_lines - 1, 0);
1953
1954
	ClrToEOL(blank, TRUE);
1955
    }
1956
#endif
1957
    if (SP->_color_defs) {
1958
	_nc_reset_colors();
1959
    }
1960
}
1961
1962
#if USE_XMC_SUPPORT
1963
NCURSES_EXPORT(void)
1964
_nc_do_xmc_glitch(attr_t previous)
1965
{
1966
    attr_t chg = XMC_CHANGES(previous ^ AttrOf(SCREEN_ATTRS(SP)));
1967
1968
    while (chg != 0) {
1969
	if (chg & 1) {
1970
	    SP->_curscol += magic_cookie_glitch;
1971
	    if (SP->_curscol >= SP->_columns)
1972
		wrap_cursor();
1973
	    TR(TRACE_UPDATE, ("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol));
1974
	}
1975
	chg >>= 1;
1976
    }
1977
}
1978
#endif /* USE_XMC_SUPPORT */