1 /****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
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: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
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. *
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 *
27 ****************************************************************************/
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 ****************************************************************************/
35 /*-----------------------------------------------------------------
39 * The routine doupdate() and its dependents.
40 * All physical output is concentrated here (except _nc_outch()
43 *-----------------------------------------------------------------*/
45 #include <curses.priv.h>
53 #if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES
54 #define USE_TRACE_TIMES 1
56 #define USE_TRACE_TIMES 0
59 #if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
64 #include <sys/times.h>
70 #include <sys/select.h>
77 MODULE_ID("$Id: tty_update.c,v 1.245 2008/05/03 22:43:04 tom Exp $")
80 * This define controls the line-breakout optimization. Every once in a
81 * while during screen refresh, we want to check for input and abort the
82 * update if there's some waiting. CHECK_INTERVAL controls the number of
83 * changed lines to be emitted between input checks.
85 * Note: Input-check-and-abort is no longer done if the screen is being
86 * updated from scratch. This is a feature, not a bug.
88 #define CHECK_INTERVAL 5
90 #define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase)
92 static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT);
93 static NCURSES_CH_T normal = NewChar(BLANK_TEXT);
96 * Enable checking to see if doupdate and friends are tracking the true
97 * cursor position correctly. NOTE: this is a debugging hack which will
98 * work ONLY on ANSI-compatible terminals!
100 /* #define POSITION_DEBUG */
102 static NCURSES_INLINE NCURSES_CH_T ClrBlank(WINDOW *win);
103 static int ClrBottom(int total);
104 static void ClearScreen(NCURSES_CH_T blank);
105 static void ClrUpdate(void);
106 static void DelChar(int count);
107 static void InsStr(NCURSES_CH_T * line, int count);
108 static void TransformLine(int const lineno);
110 #ifdef POSITION_DEBUG
111 /****************************************************************************
113 * Debugging code. Only works on ANSI-standard terminals.
115 ****************************************************************************/
118 position_check(int expected_y, int expected_x, char *legend)
119 /* check to see if the real cursor position matches the virtual */
125 if (!_nc_tracing || (expected_y < 0 && expected_x < 0))
129 memset(buf, '\0', sizeof(buf));
130 putp("\033[6n"); /* only works on ANSI-compatibles */
134 int ask = sizeof(buf) - 1 - (s - buf);
135 int got = read(0, s, ask);
139 } while (strchr(buf, 'R') == 0);
140 _tracef("probe returned %s", _nc_visbuf(buf));
142 /* try to interpret as a position report */
143 if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) {
144 _tracef("position probe failed in %s", legend);
150 if (y - 1 != expected_y || x - 1 != expected_x) {
152 tputs(tparm("\033[%d;%dH", expected_y + 1, expected_x + 1), 1, _nc_outch);
153 _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s",
154 y - 1, x - 1, expected_y, expected_x, legend);
156 _tracef("position matches OK in %s", legend);
161 #define position_check(expected_y, expected_x, legend) /* nothing */
162 #endif /* POSITION_DEBUG */
164 /****************************************************************************
166 * Optimized update code
168 ****************************************************************************/
170 static NCURSES_INLINE void
171 GoTo(int const row, int const col)
173 TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)",
174 row, col, SP->_cursrow, SP->_curscol));
176 position_check(SP->_cursrow, SP->_curscol, "GoTo");
178 mvcur(SP->_cursrow, SP->_curscol, row, col);
179 position_check(SP->_cursrow, SP->_curscol, "GoTo2");
182 static NCURSES_INLINE void
183 PutAttrChar(CARG_CH_T ch)
189 NCURSES_CH_T attr = CHDEREF(ch);
191 TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)",
193 SP->_cursrow, SP->_curscol));
194 #if USE_WIDEC_SUPPORT
196 * If this is not a valid character, there is nothing more to do.
198 if (isWidecExt(CHDEREF(ch))) {
199 TR(TRACE_CHARPUT, ("...skip"));
203 * Determine the number of character cells which the 'ch' value will use
204 * on the screen. It should be at least one.
206 if ((chlen = wcwidth(CharOf(CHDEREF(ch)))) <= 0) {
207 static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
210 * If the character falls into any of these special cases, do
211 * not force the result to a blank:
213 * a) it is printable (this works around a bug in wcwidth()).
214 * b) use_legacy_coding() has been called to modify the treatment
216 * c) the acs_map[] has been initialized to allow codes 0-31
217 * to be rendered. This supports Linux console's "PC"
218 * characters. Codes 128-255 are allowed though this is
221 if (is8bits(CharOf(CHDEREF(ch)))
222 && (isprint(CharOf(CHDEREF(ch)))
223 || (SP->_legacy_coding > 0 && CharOf(CHDEREF(ch)) >= 160)
224 || (SP->_legacy_coding > 1 && CharOf(CHDEREF(ch)) >= 128)
225 || (AttrOf(attr) & A_ALTCHARSET
226 && ((CharOfD(ch) < ACS_LEN
228 && SP->_acs_map[CharOfD(ch)] != 0)
229 || (CharOfD(ch) >= 128))))) {
233 TR(TRACE_CHARPUT, ("forced to blank"));
239 if ((AttrOf(attr) & A_ALTCHARSET)
241 && CharOfD(ch) < ACS_LEN) {
242 my_ch = CHDEREF(ch); /* work around const param */
243 #if USE_WIDEC_SUPPORT
245 * This is crude & ugly, but works most of the time. It checks if the
246 * acs_chars string specified that we have a mapping for this
247 * character, and uses the wide-character mapping when we expect the
248 * normal one to be broken (by mis-design ;-).
250 if (SP->_screen_acs_fix
251 && SP->_screen_acs_map[CharOf(my_ch)]) {
252 RemAttr(attr, A_ALTCHARSET);
253 my_ch = _nc_wacs[CharOf(my_ch)];
257 * If we (still) have alternate character set, it is the normal 8bit
258 * flavor. The _screen_acs_map[] array tells if the character was
259 * really in acs_chars, needed because of the way wide/normal line
260 * drawing flavors are integrated.
262 if (AttrOf(attr) & A_ALTCHARSET) {
264 chtype temp = UChar(SP->_acs_map[j]);
266 if (!(SP->_screen_acs_map[j])) {
267 RemAttr(attr, A_ALTCHARSET);
272 SetChar(my_ch, temp, AttrOf(attr));
276 if (tilde_glitch && (CharOfD(ch) == L('~'))) {
277 SetChar(tilde, L('`'), AttrOf(attr));
282 #if !USE_WIDEC_SUPPORT
283 /* FIXME - we do this special case for signal handling, should see how to
284 * make it work for wide characters.
286 if (SP->_outch != 0) {
287 SP->_outch(UChar(ch));
291 PUTC(CHDEREF(ch), SP->_ofp); /* macro's fastest... */
294 SP->_curscol += chlen;
296 TPUTS_TRACE("char_padding");
303 /* check for pending input */
305 bool have_pending = FALSE;
308 * Only carry out this check when the flag is zero, otherwise we'll
309 * have the refreshing slow down drastically (or stop) if there's an
310 * unread character available.
312 if (SP->_fifohold != 0)
315 if (SP->_checkfd >= 0) {
317 struct pollfd fds[1];
318 fds[0].fd = SP->_checkfd;
319 fds[0].events = POLLIN;
320 if (poll(fds, 1, 0) > 0) {
323 #elif defined(__BEOS__)
325 * BeOS's select() is declared in socket.h, so the configure script does
326 * not see it. That's just as well, since that function works only for
327 * sockets. This (using snooze and ioctl) was distilled from Be's patch
328 * for ncurses which uses a separate thread to simulate select().
330 * FIXME: the return values from the ioctl aren't very clear if we get
334 int howmany = ioctl(0, 'ichr', &n);
335 if (howmany >= 0 && n > 0) {
340 struct timeval ktimeout;
343 ktimeout.tv_usec = 0;
346 FD_SET(SP->_checkfd, &fdset);
347 if (select(SP->_checkfd + 1, &fdset, NULL, NULL, &ktimeout) != 0) {
359 /* put char at lower right corner */
361 PutCharLR(const ARG_CH_T ch)
363 if (!auto_right_margin) {
364 /* we can put the char directly */
366 } else if (enter_am_mode && exit_am_mode) {
367 /* we can suppress automargin */
368 TPUTS_TRACE("exit_am_mode");
373 position_check(SP->_cursrow, SP->_curscol, "exit_am_mode");
375 TPUTS_TRACE("enter_am_mode");
377 } else if ((enter_insert_mode && exit_insert_mode)
378 || insert_character || parm_ich) {
379 GoTo(screen_lines - 1, screen_columns - 2);
381 GoTo(screen_lines - 1, screen_columns - 2);
382 InsStr(newscr->_line[screen_lines - 1].text + screen_columns - 2, 1);
387 * Wrap the cursor position, i.e., advance to the beginning of the next line.
392 if (eat_newline_glitch) {
394 * xenl can manifest two different ways. The vt100 way is that, when
395 * you'd expect the cursor to wrap, it stays hung at the right margin
396 * (on top of the character just emitted) and doesn't wrap until the
397 * *next* graphic char is emitted. The c100 way is to ignore LF
398 * received just after an am wrap.
400 * An aggressive way to handle this would be to emit CR/LF after the
401 * char and then assume the wrap is done, you're on the first position
402 * of the next line, and the terminal out of its weird state. Here
403 * it's safe to just tell the code that the cursor is in hyperspace and
404 * let the next mvcur() call straighten things out.
408 } else if (auto_right_margin) {
412 * We've actually moved - but may have to work around problems with
413 * video attributes not working.
415 if (!move_standout_mode && AttrOf(SCREEN_ATTRS(SP))) {
416 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before wrapping",
417 (unsigned long) AttrOf(SCREEN_ATTRS(SP)),
418 _traceattr(AttrOf(SCREEN_ATTRS(SP)))));
419 (void) VIDATTR(A_NORMAL, 0);
424 position_check(SP->_cursrow, SP->_curscol, "wrap_cursor");
427 static NCURSES_INLINE void
428 PutChar(const ARG_CH_T ch)
429 /* insert character, handling automargin stuff */
431 if (SP->_cursrow == screen_lines - 1 && SP->_curscol == screen_columns - 1)
436 if (SP->_curscol >= screen_columns)
439 position_check(SP->_cursrow, SP->_curscol, "PutChar");
443 * Check whether the given character can be output by clearing commands. This
444 * includes test for being a space and not including any 'bad' attributes, such
445 * as A_REVERSE. All attribute flags which don't affect appearance of a space
446 * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded.
448 static NCURSES_INLINE bool
449 can_clear_with(ARG_CH_T ch)
451 if (!back_color_erase && SP->_coloron) {
452 #if NCURSES_EXT_FUNCS
455 if (!SP->_default_color)
457 if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK)
459 if ((pair = GetPair(CHDEREF(ch))) != 0) {
461 pair_content(pair, &fg, &bg);
462 if (fg != C_MASK || bg != C_MASK)
466 if (AttrOfD(ch) & A_COLOR)
470 return (ISBLANK(CHDEREF(ch)) &&
471 (AttrOfD(ch) & ~(NONBLANK_ATTR | A_COLOR)) == BLANK_ATTR);
475 * Issue a given span of characters from an array.
476 * Must be functionally equivalent to:
477 * for (i = 0; i < num; i++)
479 * but can leave the cursor positioned at the middle of the interval.
481 * Returns: 0 - cursor is at the end of interval
482 * 1 - cursor is somewhere in the middle
484 * This code is optimized using ech and rep.
487 EmitRange(const NCURSES_CH_T * ntext, int num)
491 TR(TRACE_CHARPUT, ("EmitRange %d:%s", num, _nc_viscbuf(ntext, num)));
493 if (erase_chars || repeat_char) {
498 while (num > 1 && !CharEq(ntext[0], ntext[1])) {
499 PutChar(CHREF(ntext[0]));
505 PutChar(CHREF(ntext0));
510 while (runcount < num && CharEq(ntext[runcount], ntext0))
514 * The cost expression in the middle isn't exactly right.
515 * _cup_ch_cost is an upper bound on the cost for moving to the
516 * end of the erased area, but not the cost itself (which we
517 * can't compute without emitting the move). This may result
518 * in erase_chars not getting used in some situations for
519 * which it would be marginally advantageous.
522 && runcount > SP->_ech_cost + SP->_cup_ch_cost
523 && can_clear_with(CHREF(ntext0))) {
525 putp(TPARM_1(erase_chars, runcount));
528 * If this is the last part of the given interval,
529 * don't bother moving cursor, since it can be the
530 * last update on the line.
532 if (runcount < num) {
533 GoTo(SP->_cursrow, SP->_curscol + runcount);
535 return 1; /* cursor stays in the middle */
537 } else if (repeat_char && runcount > SP->_rep_cost) {
538 bool wrap_possible = (SP->_curscol + runcount >= screen_columns);
539 int rep_count = runcount;
545 tputs(TPARM_2(repeat_char, CharOf(ntext0), rep_count),
546 rep_count, _nc_outch);
547 SP->_curscol += rep_count;
550 PutChar(CHREF(ntext0));
552 for (i = 0; i < runcount; i++)
553 PutChar(CHREF(ntext[i]));
561 for (i = 0; i < num; i++)
562 PutChar(CHREF(ntext[i]));
567 * Output the line in the given range [first .. last]
569 * If there's a run of identical characters that's long enough to justify
570 * cursor movement, use that also.
572 * Returns: same as EmitRange
575 PutRange(const NCURSES_CH_T * otext,
576 const NCURSES_CH_T * ntext,
582 TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)",
583 otext, ntext, row, first, last));
586 && (last - first + 1) > SP->_inline_cost) {
587 for (j = first, same = 0; j <= last; j++) {
588 if (!same && isWidecExt(otext[j]))
590 if (CharEq(otext[j], ntext[j])) {
593 if (same > SP->_inline_cost) {
594 EmitRange(ntext + first, j - same - first);
595 GoTo(row, first = j);
600 i = EmitRange(ntext + first, j - same - first);
602 * Always return 1 for the next GoTo() after a PutRange() if we found
603 * identical characters at end of interval
605 return (same == 0 ? i : 1);
607 return EmitRange(ntext + first, last - first + 1);
610 /* leave unbracketed here so 'indent' works */
611 #define MARK_NOCHANGE(win,row) \
612 win->_line[row].firstchar = _NOCHANGE; \
613 win->_line[row].lastchar = _NOCHANGE; \
614 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row)
622 struct tms before, after;
623 #endif /* USE_TRACE_TIMES */
625 T((T_CALLED("doupdate()")));
632 if (USE_TRACEF(TRACE_UPDATE)) {
634 _tracef("curscr is clear");
636 _tracedump("curscr", curscr);
637 _tracedump("newscr", newscr);
638 _nc_unlock_global(tracef);
642 _nc_signal_handler(FALSE);
648 if (SP->_endwin || _nc_handle_sigwinch(SP)) {
650 * This is a transparent extension: XSI does not address it,
651 * and applications need not know that ncurses can do it.
653 * Check if the terminal size has changed while curses was off
654 * (this can happen in an xterm, for example), and resize the
655 * ncurses data structures accordingly.
657 _nc_update_screensize(SP);
663 T(("coming back from shell mode"));
668 SP->_mouse_resume(SP);
673 /* zero the metering machinery */
675 (void) times(&before);
676 #endif /* USE_TRACE_TIMES */
679 * This is the support for magic-cookie terminals. The theory: we scan
680 * the virtual screen looking for attribute turnons. Where we find one,
681 * check to make sure it's realizable by seeing if the required number of
682 * un-attributed blanks are present before and after the attributed range;
683 * try to shift the range boundaries over blanks (not changing the screen
684 * display) so this becomes true. If it is, shift the beginning attribute
685 * change appropriately (the end one, if we've gotten this far, is
686 * guaranteed room for its cookie). If not, nuke the added attributes out
690 if (magic_cookie_glitch > 0) {
692 attr_t rattr = A_NORMAL;
694 for (i = 0; i < screen_lines; i++) {
695 for (j = 0; j < screen_columns; j++) {
697 NCURSES_CH_T *thisline = newscr->_line[i].text;
698 attr_t thisattr = AttrOf(thisline[j]) & SP->_xmc_triggers;
699 attr_t turnon = thisattr & ~rattr;
701 /* is an attribute turned on here? */
707 TR(TRACE_ATTRS, ("At (%d, %d): from %s...", i, j, _traceattr(rattr)));
708 TR(TRACE_ATTRS, ("...to %s", _traceattr(turnon)));
711 * If the attribute change location is a blank with a "safe"
712 * attribute, undo the attribute turnon. This may ensure
713 * there's enough room to set the attribute before the first
714 * non-blank in the run.
716 #define SAFE(a) (!((a) & SP->_xmc_triggers))
717 if (ISBLANK(thisline[j]) && SAFE(turnon)) {
718 RemAttr(thisline[j], turnon);
722 /* check that there's enough room at start of span */
723 for (k = 1; k <= magic_cookie_glitch; k++) {
725 || !ISBLANK(thisline[j - k])
726 || !SAFE(AttrOf(thisline[j - k]))) {
728 TR(TRACE_ATTRS, ("No room at start in %d,%d%s%s",
730 (ISBLANK(thisline[j - k])
733 (SAFE(AttrOf(thisline[j - k]))
740 bool end_onscreen = FALSE;
743 /* find end of span, if it's onscreen */
744 for (m = i; m < screen_lines; m++) {
745 for (; n < screen_columns; n++) {
746 attr_t testattr = AttrOf(newscr->_line[m].text[n]);
747 if ((testattr & SP->_xmc_triggers) == rattr) {
750 ("Range attributed with %s ends at (%d, %d)",
751 _traceattr(turnon), m, n));
758 ("Range attributed with %s ends offscreen",
759 _traceattr(turnon)));
763 NCURSES_CH_T *lastline = newscr->_line[m].text;
766 * If there are safely-attributed blanks at the end of
767 * the range, shorten the range. This will help ensure
768 * that there is enough room at end of span.
771 && ISBLANK(lastline[n])
772 && SAFE(AttrOf(lastline[n]))) {
773 RemAttr(lastline[n--], turnon);
776 /* check that there's enough room at end of span */
777 for (k = 1; k <= magic_cookie_glitch; k++) {
778 if (n + k >= screen_columns
779 || !ISBLANK(lastline[n + k])
780 || !SAFE(AttrOf(lastline[n + k]))) {
783 ("No room at end in %d,%d%s%s",
785 (ISBLANK(lastline[n + k])
788 (SAFE(AttrOf(lastline[n + k]))
801 ("Clearing %s beginning at (%d, %d)",
802 _traceattr(turnon), i, j));
804 /* turn off new attributes over span */
805 for (p = i; p < screen_lines; p++) {
806 for (; q < screen_columns; q++) {
807 attr_t testattr = AttrOf(newscr->_line[p].text[q]);
808 if ((testattr & SP->_xmc_triggers) == rattr)
810 RemAttr(newscr->_line[p].text[q], turnon);
817 ("Cookie space for %s found before (%d, %d)",
818 _traceattr(turnon), i, j));
821 * Back up the start of range so there's room for cookies
822 * before the first nonblank character.
824 for (k = 1; k <= magic_cookie_glitch; k++)
825 AddAttr(thisline[j - k], turnon);
833 /* show altered highlights after magic-cookie check */
834 if (USE_TRACEF(TRACE_UPDATE)) {
835 _tracef("After magic-cookie check...");
836 _tracedump("newscr", newscr);
837 _nc_unlock_global(tracef);
841 #endif /* USE_XMC_SUPPORT */
844 if (curscr->_clear || newscr->_clear) { /* force refresh ? */
846 curscr->_clear = FALSE; /* reset flag */
847 newscr->_clear = FALSE; /* reset flag */
849 int changedlines = CHECK_INTERVAL;
854 nonempty = min(screen_lines, newscr->_maxy + 1);
856 if (SP->_scrolling) {
857 _nc_scroll_optimize();
860 nonempty = ClrBottom(nonempty);
862 TR(TRACE_UPDATE, ("Transforming lines, nonempty %d", nonempty));
863 for (i = 0; i < nonempty; i++) {
865 * Here is our line-breakout optimization.
867 if (changedlines == CHECK_INTERVAL) {
874 * newscr->line[i].firstchar is normally set
875 * by wnoutrefresh. curscr->line[i].firstchar
876 * is normally set by _nc_scroll_window in the
877 * vertical-movement optimization code,
879 if (newscr->_line[i].firstchar != _NOCHANGE
880 || curscr->_line[i].firstchar != _NOCHANGE) {
885 /* mark line changed successfully */
886 if (i <= newscr->_maxy) {
887 MARK_NOCHANGE(newscr, i);
889 if (i <= curscr->_maxy) {
890 MARK_NOCHANGE(curscr, i);
895 /* put everything back in sync */
896 for (i = nonempty; i <= newscr->_maxy; i++) {
897 MARK_NOCHANGE(newscr, i);
899 for (i = nonempty; i <= curscr->_maxy; i++) {
900 MARK_NOCHANGE(curscr, i);
903 if (!newscr->_leaveok) {
904 curscr->_curx = newscr->_curx;
905 curscr->_cury = newscr->_cury;
907 GoTo(curscr->_cury, curscr->_curx);
912 * We would like to keep the physical screen in normal mode in case we get
913 * other processes writing to the screen. This goal cannot be met for
914 * magic cookies since it interferes with attributes that may propagate
915 * past the current position.
918 if (magic_cookie_glitch != 0)
923 WINDOW_ATTRS(curscr) = WINDOW_ATTRS(newscr);
926 (void) times(&after);
928 ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time",
930 (long) (after.tms_stime - before.tms_stime),
931 (long) (after.tms_utime - before.tms_utime)));
932 #endif /* USE_TRACE_TIMES */
934 _nc_signal_handler(TRUE);
942 * Returns the attributed character that corresponds to the "cleared"
943 * screen. If the terminal has the back-color-erase feature, this will be
944 * colored according to the wbkgd() call.
946 * We treat 'curscr' specially because it isn't supposed to be set directly
947 * in the wbkgd() call. Assume 'stdscr' for this case.
949 #define BCE_ATTRS (A_NORMAL|A_COLOR)
950 #define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_nc_bkgd)
952 static NCURSES_INLINE NCURSES_CH_T
953 ClrBlank(WINDOW *win)
955 NCURSES_CH_T blank = blankchar;
956 if (back_color_erase)
957 AddAttr(blank, (AttrOf(BCE_BKGD(win)) & BCE_ATTRS));
964 ** Update by clearing and redrawing the entire screen.
972 NCURSES_CH_T blank = ClrBlank(stdscr);
973 int nonempty = min(screen_lines, newscr->_maxy + 1);
975 TR(TRACE_UPDATE, (T_CALLED("ClrUpdate")));
979 TR(TRACE_UPDATE, ("updating screen from scratch"));
981 nonempty = ClrBottom(nonempty);
983 for (i = 0; i < nonempty; i++)
986 TR(TRACE_UPDATE, (T_RETURN("")));
992 ** Clear to end of current line, starting at the cursor position
996 ClrToEOL(NCURSES_CH_T blank, bool needclear)
1001 && SP->_cursrow >= 0) {
1002 for (j = SP->_curscol; j < screen_columns; j++) {
1004 NCURSES_CH_T *cp = &(curscr->_line[SP->_cursrow].text[j]);
1006 if (!CharEq(*cp, blank)) {
1018 TPUTS_TRACE("clr_eol");
1019 if (clr_eol && SP->_el_cost <= (screen_columns - SP->_curscol)) {
1022 int count = (screen_columns - SP->_curscol);
1024 PutChar(CHREF(blank));
1032 ** Clear to end of screen, starting at the cursor position
1036 ClrToEOS(NCURSES_CH_T blank)
1044 TPUTS_TRACE("clr_eos");
1045 tputs(clr_eos, screen_lines - row, _nc_outch);
1047 while (col < screen_columns)
1048 curscr->_line[row].text[col++] = blank;
1050 for (row++; row < screen_lines; row++) {
1051 for (col = 0; col < screen_columns; col++)
1052 curscr->_line[row].text[col] = blank;
1059 * Test if clearing the end of the screen would satisfy part of the
1060 * screen-update. Do this by scanning backwards through the lines in the
1061 * screen, checking if each is blank, and one or more are changed.
1064 ClrBottom(int total)
1069 int last = min(screen_columns, newscr->_maxx + 1);
1070 NCURSES_CH_T blank = newscr->_line[total - 1].text[last - 1];
1073 if (clr_eos && can_clear_with(CHREF(blank))) {
1075 for (row = total - 1; row >= 0; row--) {
1076 for (col = 0, ok = TRUE; ok && col < last; col++) {
1077 ok = (CharEq(newscr->_line[row].text[col], blank));
1082 for (col = 0; ok && col < last; col++) {
1083 ok = (CharEq(curscr->_line[row].text[col], blank));
1089 /* don't use clr_eos for just one line if clr_eol available */
1093 if (SP->oldhash && SP->newhash) {
1094 for (row = top; row < screen_lines; row++)
1095 SP->oldhash[row] = SP->newhash[row];
1103 #if USE_WIDEC_SUPPORT
1104 #define check_xmc_transition(a, b) \
1105 ((((a)->attr ^ (b)->attr) & ~((a)->attr) & SP->_xmc_triggers) != 0)
1106 #define xmc_turn_on(a,b) check_xmc_transition(&(a), &(b))
1108 #define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0)
1111 #define xmc_new(r,c) newscr->_line[r].text[c]
1112 #define xmc_turn_off(a,b) xmc_turn_on(b,a)
1113 #endif /* USE_XMC_SUPPORT */
1116 ** TransformLine(lineno)
1118 ** Transform the given line in curscr to the one in newscr, using
1119 ** Insert/Delete Character if _nc_idcok && has_ic().
1121 ** firstChar = position of first different character in line
1122 ** oLastChar = position of last different character in old line
1123 ** nLastChar = position of last different character in new line
1125 ** move to firstChar
1126 ** overwrite chars up to min(oLastChar, nLastChar)
1127 ** if oLastChar < nLastChar
1128 ** insert newLine[oLastChar+1..nLastChar]
1130 ** delete oLastChar - nLastChar spaces
1134 TransformLine(int const lineno)
1136 int firstChar, oLastChar, nLastChar;
1137 NCURSES_CH_T *newLine = newscr->_line[lineno].text;
1138 NCURSES_CH_T *oldLine = curscr->_line[lineno].text;
1140 bool attrchanged = FALSE;
1142 TR(TRACE_UPDATE, (T_CALLED("TransformLine(%d)"), lineno));
1144 /* copy new hash value to old one */
1145 if (SP->oldhash && SP->newhash)
1146 SP->oldhash[lineno] = SP->newhash[lineno];
1149 * If we have colors, there is the possibility of having two color pairs
1150 * that display as the same colors. For instance, Lynx does this. Check
1151 * for this case, and update the old line with the new line's colors when
1152 * they are equivalent.
1158 for (n = 0; n < screen_columns; n++) {
1159 if (!CharEq(newLine[n], oldLine[n])) {
1160 oldPair = GetPair(oldLine[n]);
1161 newPair = GetPair(newLine[n]);
1162 if (oldPair != newPair
1163 && unColor(oldLine[n]) == unColor(newLine[n])) {
1164 if (oldPair < COLOR_PAIRS
1165 && newPair < COLOR_PAIRS
1166 && SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) {
1167 SetPair(oldLine[n], GetPair(newLine[n]));
1174 if (ceol_standout_glitch && clr_eol) {
1176 while (firstChar < screen_columns) {
1177 if (!SameAttrOf(newLine[firstChar], oldLine[firstChar])) {
1187 if (attrchanged) { /* we may have to disregard the whole line */
1188 GoTo(lineno, firstChar);
1189 ClrToEOL(ClrBlank(curscr), FALSE);
1190 PutRange(oldLine, newLine, lineno, 0, (screen_columns - 1));
1194 * This is a very simple loop to paint characters which may have the
1195 * magic cookie glitch embedded. It doesn't know much about video
1196 * attributes which are continued from one line to the next. It
1197 * assumes that we have filtered out requests for attribute changes
1198 * that do not get mapped to blank positions.
1200 * FIXME: we are not keeping track of where we put the cookies, so this
1201 * will work properly only once, since we may overwrite a cookie in a
1202 * following operation.
1204 } else if (magic_cookie_glitch > 0) {
1205 GoTo(lineno, firstChar);
1206 for (n = 0; n < screen_columns; n++) {
1207 int m = n + magic_cookie_glitch;
1209 /* check for turn-on:
1210 * If we are writing an attributed blank, where the
1211 * previous cell is not attributed.
1213 if (ISBLANK(newLine[n])
1215 && xmc_turn_on(newLine[n - 1], newLine[n]))
1218 && xmc_turn_on(xmc_new(lineno - 1, screen_columns - 1),
1223 PutChar(CHREF(newLine[n]));
1225 /* check for turn-off:
1226 * If we are writing an attributed non-blank, where the
1227 * next cell is blank, and not attributed.
1229 if (!ISBLANK(newLine[n])
1230 && ((n + 1 < screen_columns
1231 && xmc_turn_off(newLine[n], newLine[n + 1]))
1232 || (n + 1 >= screen_columns
1233 && lineno + 1 < screen_lines
1234 && xmc_turn_off(newLine[n], xmc_new(lineno + 1, 0))))) {
1243 /* it may be cheap to clear leading whitespace with clr_bol */
1245 if (clr_bol && can_clear_with(CHREF(blank))) {
1246 int oFirstChar, nFirstChar;
1248 for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++)
1249 if (!CharEq(oldLine[oFirstChar], blank))
1251 for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++)
1252 if (!CharEq(newLine[nFirstChar], blank))
1255 if (nFirstChar == oFirstChar) {
1256 firstChar = nFirstChar;
1257 /* find the first differing character */
1258 while (firstChar < screen_columns
1259 && CharEq(newLine[firstChar], oldLine[firstChar]))
1261 } else if (oFirstChar > nFirstChar) {
1262 firstChar = nFirstChar;
1263 } else { /* oFirstChar < nFirstChar */
1264 firstChar = oFirstChar;
1265 if (SP->_el1_cost < nFirstChar - oFirstChar) {
1266 if (nFirstChar >= screen_columns
1267 && SP->_el_cost <= SP->_el1_cost) {
1270 TPUTS_TRACE("clr_eol");
1273 GoTo(lineno, nFirstChar - 1);
1275 TPUTS_TRACE("clr_bol");
1279 while (firstChar < nFirstChar)
1280 oldLine[firstChar++] = blank;
1284 /* find the first differing character */
1285 while (firstChar < screen_columns
1286 && CharEq(newLine[firstChar], oldLine[firstChar]))
1289 /* if there wasn't one, we're done */
1290 if (firstChar >= screen_columns) {
1291 TR(TRACE_UPDATE, (T_RETURN("")));
1295 blank = newLine[screen_columns - 1];
1297 if (!can_clear_with(CHREF(blank))) {
1298 /* find the last differing character */
1299 nLastChar = screen_columns - 1;
1301 while (nLastChar > firstChar
1302 && CharEq(newLine[nLastChar], oldLine[nLastChar]))
1305 if (nLastChar >= firstChar) {
1306 GoTo(lineno, firstChar);
1307 PutRange(oldLine, newLine, lineno, firstChar, nLastChar);
1308 memcpy(oldLine + firstChar,
1309 newLine + firstChar,
1310 (nLastChar - firstChar + 1) * sizeof(NCURSES_CH_T));
1312 TR(TRACE_UPDATE, (T_RETURN("")));
1316 /* find last non-blank character on old line */
1317 oLastChar = screen_columns - 1;
1318 while (oLastChar > firstChar && CharEq(oldLine[oLastChar], blank))
1321 /* find last non-blank character on new line */
1322 nLastChar = screen_columns - 1;
1323 while (nLastChar > firstChar && CharEq(newLine[nLastChar], blank))
1326 if ((nLastChar == firstChar)
1327 && (SP->_el_cost < (oLastChar - nLastChar))) {
1328 GoTo(lineno, firstChar);
1329 if (!CharEq(newLine[firstChar], blank))
1330 PutChar(CHREF(newLine[firstChar]));
1331 ClrToEOL(blank, FALSE);
1332 } else if ((nLastChar != oLastChar)
1333 && (!CharEq(newLine[nLastChar], oldLine[oLastChar])
1334 || !(_nc_idcok && has_ic()))) {
1335 GoTo(lineno, firstChar);
1336 if ((oLastChar - nLastChar) > SP->_el_cost) {
1337 if (PutRange(oldLine, newLine, lineno, firstChar, nLastChar))
1338 GoTo(lineno, nLastChar + 1);
1339 ClrToEOL(blank, FALSE);
1341 n = max(nLastChar, oLastChar);
1342 PutRange(oldLine, newLine, lineno, firstChar, n);
1345 int nLastNonblank = nLastChar;
1346 int oLastNonblank = oLastChar;
1348 /* find the last characters that really differ */
1349 /* can be -1 if no characters differ */
1350 while (CharEq(newLine[nLastChar], oldLine[oLastChar])) {
1351 /* don't split a wide char */
1352 if (isWidecExt(newLine[nLastChar]) &&
1353 !CharEq(newLine[nLastChar - 1], oldLine[oLastChar - 1]))
1357 if (nLastChar == -1 || oLastChar == -1)
1361 n = min(oLastChar, nLastChar);
1362 if (n >= firstChar) {
1363 GoTo(lineno, firstChar);
1364 PutRange(oldLine, newLine, lineno, firstChar, n);
1367 if (oLastChar < nLastChar) {
1368 int m = max(nLastNonblank, oLastNonblank);
1369 #if USE_WIDEC_SUPPORT
1370 while (isWidecExt(newLine[n + 1]) && n) {
1375 GoTo(lineno, n + 1);
1376 if ((nLastChar < nLastNonblank)
1377 || InsCharCost(nLastChar - oLastChar) > (m - n)) {
1378 PutRange(oldLine, newLine, lineno, n + 1, m);
1380 InsStr(&newLine[n + 1], nLastChar - oLastChar);
1382 } else if (oLastChar > nLastChar) {
1383 GoTo(lineno, n + 1);
1384 if (DelCharCost(oLastChar - nLastChar)
1385 > SP->_el_cost + nLastNonblank - (n + 1)) {
1386 if (PutRange(oldLine, newLine, lineno,
1387 n + 1, nLastNonblank))
1388 GoTo(lineno, nLastNonblank + 1);
1389 ClrToEOL(blank, FALSE);
1392 * The delete-char sequence will
1393 * effectively shift in blanks from the
1394 * right margin of the screen. Ensure
1395 * that they are the right color by
1396 * setting the video attributes from
1397 * the last character on the row.
1400 DelChar(oLastChar - nLastChar);
1406 /* update the code's internal representation */
1407 if (screen_columns > firstChar)
1408 memcpy(oldLine + firstChar,
1409 newLine + firstChar,
1410 (screen_columns - firstChar) * sizeof(NCURSES_CH_T));
1411 TR(TRACE_UPDATE, (T_RETURN("")));
1416 ** ClearScreen(blank)
1418 ** Clear the physical screen and put cursor at home
1423 ClearScreen(NCURSES_CH_T blank)
1426 bool fast_clear = (clear_screen || clr_eos || clr_eol);
1428 TR(TRACE_UPDATE, ("ClearScreen() called"));
1430 #if NCURSES_EXT_FUNCS
1432 && !SP->_default_color) {
1433 _nc_do_color(GET_SCREEN_PAIR(SP), 0, FALSE, _nc_outch);
1434 if (!back_color_erase) {
1443 TPUTS_TRACE("clear_screen");
1445 SP->_cursrow = SP->_curscol = 0;
1446 position_check(SP->_cursrow, SP->_curscol, "ClearScreen");
1447 } else if (clr_eos) {
1448 SP->_cursrow = SP->_curscol = -1;
1452 TPUTS_TRACE("clr_eos");
1453 tputs(clr_eos, screen_lines, _nc_outch);
1454 } else if (clr_eol) {
1455 SP->_cursrow = SP->_curscol = -1;
1458 for (i = 0; i < screen_lines; i++) {
1460 TPUTS_TRACE("clr_eol");
1467 for (i = 0; i < screen_lines; i++) {
1469 for (j = 0; j < screen_columns; j++)
1470 PutChar(CHREF(blank));
1475 for (i = 0; i < screen_lines; i++) {
1476 for (j = 0; j < screen_columns; j++)
1477 curscr->_line[i].text[j] = blank;
1480 TR(TRACE_UPDATE, ("screen cleared"));
1484 ** InsStr(line, count)
1486 ** Insert the count characters pointed to by line.
1491 InsStr(NCURSES_CH_T * line, int count)
1493 TR(TRACE_UPDATE, ("InsStr(%p,%d) called", line, count));
1495 /* Prefer parm_ich as it has the smallest cost - no need to shift
1496 * the whole line on each character. */
1497 /* The order must match that of InsCharCost. */
1499 TPUTS_TRACE("parm_ich");
1500 tputs(TPARM_1(parm_ich, count), count, _nc_outch);
1502 PutAttrChar(CHREF(*line));
1506 } else if (enter_insert_mode && exit_insert_mode) {
1507 TPUTS_TRACE("enter_insert_mode");
1508 putp(enter_insert_mode);
1510 PutAttrChar(CHREF(*line));
1511 if (insert_padding) {
1512 TPUTS_TRACE("insert_padding");
1513 putp(insert_padding);
1518 TPUTS_TRACE("exit_insert_mode");
1519 putp(exit_insert_mode);
1522 TPUTS_TRACE("insert_character");
1523 putp(insert_character);
1524 PutAttrChar(CHREF(*line));
1525 if (insert_padding) {
1526 TPUTS_TRACE("insert_padding");
1527 putp(insert_padding);
1533 position_check(SP->_cursrow, SP->_curscol, "InsStr");
1539 ** Delete count characters at current position
1548 TR(TRACE_UPDATE, ("DelChar(%d) called, position = (%ld,%ld)",
1550 (long) newscr->_cury,
1551 (long) newscr->_curx));
1554 TPUTS_TRACE("parm_dch");
1555 tputs(TPARM_1(parm_dch, count), count, _nc_outch);
1557 for (n = 0; n < count; n++) {
1558 TPUTS_TRACE("delete_character");
1559 putp(delete_character);
1565 * Physical-scrolling support
1567 * This code was adapted from Keith Bostic's hardware scrolling
1568 * support for 4.4BSD curses. I (esr) translated it to use terminfo
1569 * capabilities, narrowed the call interface slightly, and cleaned
1570 * up some convoluted tests. I also added support for the memory_above
1571 * memory_below, and non_dest_scroll_region capabilities.
1573 * For this code to work, we must have either
1574 * change_scroll_region and scroll forward/reverse commands, or
1575 * insert and delete line capabilities.
1576 * When the scrolling region has been set, the cursor has to
1577 * be at the last line of the region to make the scroll up
1578 * happen, or on the first line of region to scroll down.
1580 * This code makes one aesthetic decision in the opposite way from
1581 * BSD curses. BSD curses preferred pairs of il/dl operations
1582 * over scrolls, allegedly because il/dl looked faster. We, on
1583 * the other hand, prefer scrolls because (a) they're just as fast
1584 * on many terminals and (b) using them avoids bouncing an
1585 * unchanged bottom section of the screen up and down, which is
1588 * (lav): added more cases, used dl/il when bot==maxy and in csr case.
1590 * I used assumption that capabilities il/il1/dl/dl1 work inside
1591 * changed scroll region not shifting screen contents outside of it.
1592 * If there are any terminals behaving different way, it would be
1593 * necessary to add some conditions to scroll_csr_forward/backward.
1596 /* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */
1598 scroll_csr_forward(int n, int top, int bot, int miny, int maxy, NCURSES_CH_T blank)
1602 if (n == 1 && scroll_forward && top == miny && bot == maxy) {
1605 TPUTS_TRACE("scroll_forward");
1606 putp(scroll_forward);
1607 } else if (n == 1 && delete_line && bot == maxy) {
1610 TPUTS_TRACE("delete_line");
1612 } else if (parm_index && top == miny && bot == maxy) {
1615 TPUTS_TRACE("parm_index");
1616 tputs(TPARM_2(parm_index, n, 0), n, _nc_outch);
1617 } else if (parm_delete_line && bot == maxy) {
1620 TPUTS_TRACE("parm_delete_line");
1621 tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch);
1622 } else if (scroll_forward && top == miny && bot == maxy) {
1625 for (i = 0; i < n; i++) {
1626 TPUTS_TRACE("scroll_forward");
1627 putp(scroll_forward);
1629 } else if (delete_line && bot == maxy) {
1632 for (i = 0; i < n; i++) {
1633 TPUTS_TRACE("delete_line");
1639 #if NCURSES_EXT_FUNCS
1642 for (i = 0; i < n; i++) {
1644 for (j = 0; j < screen_columns; j++)
1645 PutChar(CHREF(blank));
1652 /* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */
1655 scroll_csr_backward(int n, int top, int bot, int miny, int maxy,
1660 if (n == 1 && scroll_reverse && top == miny && bot == maxy) {
1663 TPUTS_TRACE("scroll_reverse");
1664 putp(scroll_reverse);
1665 } else if (n == 1 && insert_line && bot == maxy) {
1668 TPUTS_TRACE("insert_line");
1670 } else if (parm_rindex && top == miny && bot == maxy) {
1673 TPUTS_TRACE("parm_rindex");
1674 tputs(TPARM_2(parm_rindex, n, 0), n, _nc_outch);
1675 } else if (parm_insert_line && bot == maxy) {
1678 TPUTS_TRACE("parm_insert_line");
1679 tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch);
1680 } else if (scroll_reverse && top == miny && bot == maxy) {
1683 for (i = 0; i < n; i++) {
1684 TPUTS_TRACE("scroll_reverse");
1685 putp(scroll_reverse);
1687 } else if (insert_line && bot == maxy) {
1690 for (i = 0; i < n; i++) {
1691 TPUTS_TRACE("insert_line");
1697 #if NCURSES_EXT_FUNCS
1700 for (i = 0; i < n; i++) {
1702 for (j = 0; j < screen_columns; j++)
1703 PutChar(CHREF(blank));
1710 /* scroll by using delete_line at del and insert_line at ins */
1713 scroll_idl(int n, int del, int ins, NCURSES_CH_T blank)
1717 if (!((parm_delete_line || delete_line) && (parm_insert_line || insert_line)))
1722 if (n == 1 && delete_line) {
1723 TPUTS_TRACE("delete_line");
1725 } else if (parm_delete_line) {
1726 TPUTS_TRACE("parm_delete_line");
1727 tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch);
1728 } else { /* if (delete_line) */
1729 for (i = 0; i < n; i++) {
1730 TPUTS_TRACE("delete_line");
1737 if (n == 1 && insert_line) {
1738 TPUTS_TRACE("insert_line");
1740 } else if (parm_insert_line) {
1741 TPUTS_TRACE("parm_insert_line");
1742 tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch);
1743 } else { /* if (insert_line) */
1744 for (i = 0; i < n; i++) {
1745 TPUTS_TRACE("insert_line");
1754 * Note: some terminals require the cursor to be within the scrolling margins
1755 * before setting them. Generally, the cursor must be at the appropriate end
1756 * of the scrolling margins when issuing an indexing operation (it is not
1757 * apparent whether it must also be at the left margin; we do this just to be
1758 * safe). To make the related cursor movement a little faster, we use the
1759 * save/restore cursor capabilities if the terminal has them.
1762 _nc_scrolln(int n, int top, int bot, int maxy)
1763 /* scroll region from top to bot by n lines */
1765 NCURSES_CH_T blank = ClrBlank(stdscr);
1767 bool cursor_saved = FALSE;
1770 TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy));
1774 * If we scroll, we might remove a cookie.
1776 if (magic_cookie_glitch > 0) {
1781 if (n > 0) { /* scroll up (forward) */
1783 * Explicitly clear if stuff pushed off top of region might
1784 * be saved by the terminal.
1786 res = scroll_csr_forward(n, top, bot, 0, maxy, blank);
1788 if (res == ERR && change_scroll_region) {
1789 if ((((n == 1 && scroll_forward) || parm_index)
1790 && (SP->_cursrow == bot || SP->_cursrow == bot - 1))
1791 && save_cursor && restore_cursor) {
1792 cursor_saved = TRUE;
1793 TPUTS_TRACE("save_cursor");
1796 TPUTS_TRACE("change_scroll_region");
1797 putp(TPARM_2(change_scroll_region, top, bot));
1799 TPUTS_TRACE("restore_cursor");
1800 putp(restore_cursor);
1802 SP->_cursrow = SP->_curscol = -1;
1805 res = scroll_csr_forward(n, top, bot, top, bot, blank);
1807 TPUTS_TRACE("change_scroll_region");
1808 putp(TPARM_2(change_scroll_region, 0, maxy));
1809 SP->_cursrow = SP->_curscol = -1;
1812 if (res == ERR && _nc_idlok)
1813 res = scroll_idl(n, top, bot - n + 1, blank);
1816 * Clear the newly shifted-in text.
1819 && (non_dest_scroll_region || (memory_below && bot == maxy))) {
1820 static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT);
1821 if (bot == maxy && clr_eos) {
1822 GoTo(bot - n + 1, 0);
1825 for (i = 0; i < n; i++) {
1827 ClrToEOL(blank2, FALSE);
1832 } else { /* (n < 0) - scroll down (backward) */
1833 res = scroll_csr_backward(-n, top, bot, 0, maxy, blank);
1835 if (res == ERR && change_scroll_region) {
1836 if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top - 1)
1837 && save_cursor && restore_cursor) {
1838 cursor_saved = TRUE;
1839 TPUTS_TRACE("save_cursor");
1842 TPUTS_TRACE("change_scroll_region");
1843 putp(TPARM_2(change_scroll_region, top, bot));
1845 TPUTS_TRACE("restore_cursor");
1846 putp(restore_cursor);
1848 SP->_cursrow = SP->_curscol = -1;
1851 res = scroll_csr_backward(-n, top, bot, top, bot, blank);
1853 TPUTS_TRACE("change_scroll_region");
1854 putp(TPARM_2(change_scroll_region, 0, maxy));
1855 SP->_cursrow = SP->_curscol = -1;
1858 if (res == ERR && _nc_idlok)
1859 res = scroll_idl(-n, bot + n + 1, top, blank);
1862 * Clear the newly shifted-in text.
1865 && (non_dest_scroll_region || (memory_above && top == 0))) {
1866 static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT);
1867 for (i = 0; i < -n; i++) {
1869 ClrToEOL(blank2, FALSE);
1877 _nc_scroll_window(curscr, n, top, bot, blank);
1879 /* shift hash values too - they can be reused */
1880 _nc_scroll_oldhash(n, top, bot);
1885 NCURSES_EXPORT(void)
1886 _nc_screen_resume(void)
1888 /* make sure terminal is in a sane known state */
1889 SetAttr(SCREEN_ATTRS(SP), A_NORMAL);
1890 newscr->_clear = TRUE;
1892 /* reset color pairs and definitions */
1893 if (SP->_coloron || SP->_color_defs)
1896 /* restore user-defined colors, if any */
1897 if (SP->_color_defs < 0) {
1899 SP->_color_defs = -(SP->_color_defs);
1900 for (n = 0; n < SP->_color_defs; ++n) {
1901 if (SP->_color_table[n].init) {
1903 SP->_color_table[n].r,
1904 SP->_color_table[n].g,
1905 SP->_color_table[n].b);
1910 if (exit_attribute_mode)
1911 putp(exit_attribute_mode);
1913 /* turn off attributes */
1914 if (exit_alt_charset_mode)
1915 putp(exit_alt_charset_mode);
1916 if (exit_standout_mode)
1917 putp(exit_standout_mode);
1918 if (exit_underline_mode)
1919 putp(exit_underline_mode);
1921 if (exit_insert_mode)
1922 putp(exit_insert_mode);
1923 if (enter_am_mode && exit_am_mode)
1924 putp(auto_right_margin ? enter_am_mode : exit_am_mode);
1927 NCURSES_EXPORT(void)
1928 _nc_screen_init(void)
1930 _nc_screen_resume();
1933 /* wrap up screen handling */
1934 NCURSES_EXPORT(void)
1935 _nc_screen_wrap(void)
1937 UpdateAttrs(normal);
1938 #if NCURSES_EXT_FUNCS
1940 && !SP->_default_color) {
1941 static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
1942 SP->_default_color = TRUE;
1943 _nc_do_color(-1, 0, FALSE, _nc_outch);
1944 SP->_default_color = FALSE;
1946 mvcur(SP->_cursrow, SP->_curscol, screen_lines - 1, 0);
1948 ClrToEOL(blank, TRUE);
1951 if (SP->_color_defs) {
1957 NCURSES_EXPORT(void)
1958 _nc_do_xmc_glitch(attr_t previous)
1960 attr_t chg = XMC_CHANGES(previous ^ AttrOf(SCREEN_ATTRS(SP)));
1964 SP->_curscol += magic_cookie_glitch;
1965 if (SP->_curscol >= SP->_columns)
1967 TR(TRACE_UPDATE, ("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol));
1972 #endif /* USE_XMC_SUPPORT */