Base version of ncurses-5.7 library
diff --git a/ncurses/tty/tty_update.c b/ncurses/tty/tty_update.c
new file mode 100644
index 0000000..6a3a0c8
--- /dev/null
+++ b/ncurses/tty/tty_update.c
@@ -0,0 +1,1976 @@
+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
+ * and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ * and: Thomas E. Dickey 1996-on *
+ ****************************************************************************/
+
+/*-----------------------------------------------------------------
+ *
+ * lib_doupdate.c
+ *
+ * The routine doupdate() and its dependents.
+ * All physical output is concentrated here (except _nc_outch()
+ * in lib_tputs.c).
+ *
+ *-----------------------------------------------------------------*/
+
+#include <curses.priv.h>
+
+#if defined __HAIKU__ && defined __BEOS__
+#undef __BEOS__
+#endif
+
+#ifdef __BEOS__
+#undef false
+#undef true
+#include <OS.h>
+#endif
+
+#if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES
+#define USE_TRACE_TIMES 1
+#else
+#define USE_TRACE_TIMES 0
+#endif
+
+#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
+#include <sys/time.h>
+#endif
+
+#if USE_TRACE_TIMES
+#include <sys/times.h>
+#endif
+
+#if USE_FUNC_POLL
+#elif HAVE_SELECT
+#if HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#endif
+
+#include <ctype.h>
+#include <term.h>
+
+MODULE_ID("$Id: tty_update.c,v 1.246 2008/08/30 20:08:19 tom Exp $")
+
+/*
+ * This define controls the line-breakout optimization. Every once in a
+ * while during screen refresh, we want to check for input and abort the
+ * update if there's some waiting. CHECK_INTERVAL controls the number of
+ * changed lines to be emitted between input checks.
+ *
+ * Note: Input-check-and-abort is no longer done if the screen is being
+ * updated from scratch. This is a feature, not a bug.
+ */
+#define CHECK_INTERVAL 5
+
+#define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase)
+
+static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT);
+static NCURSES_CH_T normal = NewChar(BLANK_TEXT);
+
+/*
+ * Enable checking to see if doupdate and friends are tracking the true
+ * cursor position correctly. NOTE: this is a debugging hack which will
+ * work ONLY on ANSI-compatible terminals!
+ */
+/* #define POSITION_DEBUG */
+
+static NCURSES_INLINE NCURSES_CH_T ClrBlank(WINDOW *win);
+static int ClrBottom(int total);
+static void ClearScreen(NCURSES_CH_T blank);
+static void ClrUpdate(void);
+static void DelChar(int count);
+static void InsStr(NCURSES_CH_T * line, int count);
+static void TransformLine(int const lineno);
+
+#ifdef POSITION_DEBUG
+/****************************************************************************
+ *
+ * Debugging code. Only works on ANSI-standard terminals.
+ *
+ ****************************************************************************/
+
+static void
+position_check(int expected_y, int expected_x, char *legend)
+/* check to see if the real cursor position matches the virtual */
+{
+ char buf[20];
+ char *s;
+ int y, x;
+
+ if (!_nc_tracing || (expected_y < 0 && expected_x < 0))
+ return;
+
+ _nc_flush();
+ memset(buf, '\0', sizeof(buf));
+ putp("\033[6n"); /* only works on ANSI-compatibles */
+ _nc_flush();
+ *(s = buf) = 0;
+ do {
+ int ask = sizeof(buf) - 1 - (s - buf);
+ int got = read(0, s, ask);
+ if (got == 0)
+ break;
+ s += got;
+ } while (strchr(buf, 'R') == 0);
+ _tracef("probe returned %s", _nc_visbuf(buf));
+
+ /* try to interpret as a position report */
+ if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) {
+ _tracef("position probe failed in %s", legend);
+ } else {
+ if (expected_x < 0)
+ expected_x = x - 1;
+ if (expected_y < 0)
+ expected_y = y - 1;
+ if (y - 1 != expected_y || x - 1 != expected_x) {
+ beep();
+ tputs(tparm("\033[%d;%dH", expected_y + 1, expected_x + 1), 1, _nc_outch);
+ _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s",
+ y - 1, x - 1, expected_y, expected_x, legend);
+ } else {
+ _tracef("position matches OK in %s", legend);
+ }
+ }
+}
+#else
+#define position_check(expected_y, expected_x, legend) /* nothing */
+#endif /* POSITION_DEBUG */
+
+/****************************************************************************
+ *
+ * Optimized update code
+ *
+ ****************************************************************************/
+
+static NCURSES_INLINE void
+GoTo(int const row, int const col)
+{
+ TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)",
+ row, col, SP->_cursrow, SP->_curscol));
+
+ position_check(SP->_cursrow, SP->_curscol, "GoTo");
+
+ mvcur(SP->_cursrow, SP->_curscol, row, col);
+ position_check(SP->_cursrow, SP->_curscol, "GoTo2");
+}
+
+static NCURSES_INLINE void
+PutAttrChar(CARG_CH_T ch)
+{
+ int chlen = 1;
+ NCURSES_CH_T my_ch;
+ PUTC_DATA;
+ NCURSES_CH_T tilde;
+ NCURSES_CH_T attr = CHDEREF(ch);
+
+ TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)",
+ _tracech_t(ch),
+ SP->_cursrow, SP->_curscol));
+#if USE_WIDEC_SUPPORT
+ /*
+ * If this is not a valid character, there is nothing more to do.
+ */
+ if (isWidecExt(CHDEREF(ch))) {
+ TR(TRACE_CHARPUT, ("...skip"));
+ return;
+ }
+ /*
+ * Determine the number of character cells which the 'ch' value will use
+ * on the screen. It should be at least one.
+ */
+ if ((chlen = wcwidth(CharOf(CHDEREF(ch)))) <= 0) {
+ static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
+
+ /*
+ * If the character falls into any of these special cases, do
+ * not force the result to a blank:
+ *
+ * a) it is printable (this works around a bug in wcwidth()).
+ * b) use_legacy_coding() has been called to modify the treatment
+ * of codes 128-255.
+ * c) the acs_map[] has been initialized to allow codes 0-31
+ * to be rendered. This supports Linux console's "PC"
+ * characters. Codes 128-255 are allowed though this is
+ * not checked.
+ */
+ if (is8bits(CharOf(CHDEREF(ch)))
+ && (isprint(CharOf(CHDEREF(ch)))
+ || (SP->_legacy_coding > 0 && CharOf(CHDEREF(ch)) >= 160)
+ || (SP->_legacy_coding > 1 && CharOf(CHDEREF(ch)) >= 128)
+ || (AttrOf(attr) & A_ALTCHARSET
+ && ((CharOfD(ch) < ACS_LEN
+ && SP->_acs_map != 0
+ && SP->_acs_map[CharOfD(ch)] != 0)
+ || (CharOfD(ch) >= 128))))) {
+ ;
+ } else {
+ ch = CHREF(blank);
+ TR(TRACE_CHARPUT, ("forced to blank"));
+ }
+ chlen = 1;
+ }
+#endif
+
+ if ((AttrOf(attr) & A_ALTCHARSET)
+ && SP->_acs_map != 0
+ && CharOfD(ch) < ACS_LEN) {
+ my_ch = CHDEREF(ch); /* work around const param */
+#if USE_WIDEC_SUPPORT
+ /*
+ * This is crude & ugly, but works most of the time. It checks if the
+ * acs_chars string specified that we have a mapping for this
+ * character, and uses the wide-character mapping when we expect the
+ * normal one to be broken (by mis-design ;-).
+ */
+ if (SP->_screen_acs_fix
+ && SP->_screen_acs_map[CharOf(my_ch)]) {
+ RemAttr(attr, A_ALTCHARSET);
+ my_ch = _nc_wacs[CharOf(my_ch)];
+ }
+#endif
+ /*
+ * If we (still) have alternate character set, it is the normal 8bit
+ * flavor. The _screen_acs_map[] array tells if the character was
+ * really in acs_chars, needed because of the way wide/normal line
+ * drawing flavors are integrated.
+ */
+ if (AttrOf(attr) & A_ALTCHARSET) {
+ int j = CharOfD(ch);
+ chtype temp = UChar(SP->_acs_map[j]);
+
+ if (!(SP->_screen_acs_map[j])) {
+ RemAttr(attr, A_ALTCHARSET);
+ if (temp == 0)
+ temp = ' ';
+ }
+ if (temp != 0)
+ SetChar(my_ch, temp, AttrOf(attr));
+ }
+ ch = CHREF(my_ch);
+ }
+ if (tilde_glitch && (CharOfD(ch) == L('~'))) {
+ SetChar(tilde, L('`'), AttrOf(attr));
+ ch = CHREF(tilde);
+ }
+
+ UpdateAttrs(attr);
+#if !USE_WIDEC_SUPPORT
+ /* FIXME - we do this special case for signal handling, should see how to
+ * make it work for wide characters.
+ */
+ if (SP->_outch != 0) {
+ SP->_outch(UChar(ch));
+ } else
+#endif
+ {
+ PUTC(CHDEREF(ch), SP->_ofp); /* macro's fastest... */
+ COUNT_OUTCHARS(1);
+ }
+ SP->_curscol += chlen;
+ if (char_padding) {
+ TPUTS_TRACE("char_padding");
+ putp(char_padding);
+ }
+}
+
+static bool
+check_pending(void)
+/* check for pending input */
+{
+ bool have_pending = FALSE;
+
+ /*
+ * Only carry out this check when the flag is zero, otherwise we'll
+ * have the refreshing slow down drastically (or stop) if there's an
+ * unread character available.
+ */
+ if (SP->_fifohold != 0)
+ return FALSE;
+
+ if (SP->_checkfd >= 0) {
+#if USE_FUNC_POLL
+ struct pollfd fds[1];
+ fds[0].fd = SP->_checkfd;
+ fds[0].events = POLLIN;
+ if (poll(fds, 1, 0) > 0) {
+ have_pending = TRUE;
+ }
+#elif defined(__BEOS__)
+ /*
+ * BeOS's select() is declared in socket.h, so the configure script does
+ * not see it. That's just as well, since that function works only for
+ * sockets. This (using snooze and ioctl) was distilled from Be's patch
+ * for ncurses which uses a separate thread to simulate select().
+ *
+ * FIXME: the return values from the ioctl aren't very clear if we get
+ * interrupted.
+ */
+ int n = 0;
+ int howmany = ioctl(0, 'ichr', &n);
+ if (howmany >= 0 && n > 0) {
+ have_pending = TRUE;
+ }
+#elif HAVE_SELECT
+ fd_set fdset;
+ struct timeval ktimeout;
+
+ ktimeout.tv_sec =
+ ktimeout.tv_usec = 0;
+
+ FD_ZERO(&fdset);
+ FD_SET(SP->_checkfd, &fdset);
+ if (select(SP->_checkfd + 1, &fdset, NULL, NULL, &ktimeout) != 0) {
+ have_pending = TRUE;
+ }
+#endif
+ }
+ if (have_pending) {
+ SP->_fifohold = 5;
+ _nc_flush();
+ }
+ return FALSE;
+}
+
+/* put char at lower right corner */
+static void
+PutCharLR(const ARG_CH_T ch)
+{
+ if (!auto_right_margin) {
+ /* we can put the char directly */
+ PutAttrChar(ch);
+ } else if (enter_am_mode && exit_am_mode) {
+ /* we can suppress automargin */
+ TPUTS_TRACE("exit_am_mode");
+ putp(exit_am_mode);
+
+ PutAttrChar(ch);
+ SP->_curscol--;
+ position_check(SP->_cursrow, SP->_curscol, "exit_am_mode");
+
+ TPUTS_TRACE("enter_am_mode");
+ putp(enter_am_mode);
+ } else if ((enter_insert_mode && exit_insert_mode)
+ || insert_character || parm_ich) {
+ GoTo(screen_lines - 1, screen_columns - 2);
+ PutAttrChar(ch);
+ GoTo(screen_lines - 1, screen_columns - 2);
+ InsStr(newscr->_line[screen_lines - 1].text + screen_columns - 2, 1);
+ }
+}
+
+/*
+ * Wrap the cursor position, i.e., advance to the beginning of the next line.
+ */
+static void
+wrap_cursor(void)
+{
+ if (eat_newline_glitch) {
+ /*
+ * xenl can manifest two different ways. The vt100 way is that, when
+ * you'd expect the cursor to wrap, it stays hung at the right margin
+ * (on top of the character just emitted) and doesn't wrap until the
+ * *next* graphic char is emitted. The c100 way is to ignore LF
+ * received just after an am wrap.
+ *
+ * An aggressive way to handle this would be to emit CR/LF after the
+ * char and then assume the wrap is done, you're on the first position
+ * of the next line, and the terminal out of its weird state. Here
+ * it's safe to just tell the code that the cursor is in hyperspace and
+ * let the next mvcur() call straighten things out.
+ */
+ SP->_curscol = -1;
+ SP->_cursrow = -1;
+ } else if (auto_right_margin) {
+ SP->_curscol = 0;
+ SP->_cursrow++;
+ /*
+ * We've actually moved - but may have to work around problems with
+ * video attributes not working.
+ */
+ if (!move_standout_mode && AttrOf(SCREEN_ATTRS(SP))) {
+ TR(TRACE_CHARPUT, ("turning off (%#lx) %s before wrapping",
+ (unsigned long) AttrOf(SCREEN_ATTRS(SP)),
+ _traceattr(AttrOf(SCREEN_ATTRS(SP)))));
+ (void) VIDATTR(A_NORMAL, 0);
+ }
+ } else {
+ SP->_curscol--;
+ }
+ position_check(SP->_cursrow, SP->_curscol, "wrap_cursor");
+}
+
+static NCURSES_INLINE void
+PutChar(const ARG_CH_T ch)
+/* insert character, handling automargin stuff */
+{
+ if (SP->_cursrow == screen_lines - 1 && SP->_curscol == screen_columns - 1)
+ PutCharLR(ch);
+ else
+ PutAttrChar(ch);
+
+ if (SP->_curscol >= screen_columns)
+ wrap_cursor();
+
+ position_check(SP->_cursrow, SP->_curscol, "PutChar");
+}
+
+/*
+ * Check whether the given character can be output by clearing commands. This
+ * includes test for being a space and not including any 'bad' attributes, such
+ * as A_REVERSE. All attribute flags which don't affect appearance of a space
+ * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded.
+ */
+static NCURSES_INLINE bool
+can_clear_with(ARG_CH_T ch)
+{
+ if (!back_color_erase && SP->_coloron) {
+#if NCURSES_EXT_FUNCS
+ int pair;
+
+ if (!SP->_default_color)
+ return FALSE;
+ if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK)
+ return FALSE;
+ if ((pair = GetPair(CHDEREF(ch))) != 0) {
+ short fg, bg;
+ pair_content(pair, &fg, &bg);
+ if (fg != C_MASK || bg != C_MASK)
+ return FALSE;
+ }
+#else
+ if (AttrOfD(ch) & A_COLOR)
+ return FALSE;
+#endif
+ }
+ return (ISBLANK(CHDEREF(ch)) &&
+ (AttrOfD(ch) & ~(NONBLANK_ATTR | A_COLOR)) == BLANK_ATTR);
+}
+
+/*
+ * Issue a given span of characters from an array.
+ * Must be functionally equivalent to:
+ * for (i = 0; i < num; i++)
+ * PutChar(ntext[i]);
+ * but can leave the cursor positioned at the middle of the interval.
+ *
+ * Returns: 0 - cursor is at the end of interval
+ * 1 - cursor is somewhere in the middle
+ *
+ * This code is optimized using ech and rep.
+ */
+static int
+EmitRange(const NCURSES_CH_T * ntext, int num)
+{
+ int i;
+
+ TR(TRACE_CHARPUT, ("EmitRange %d:%s", num, _nc_viscbuf(ntext, num)));
+
+ if (erase_chars || repeat_char) {
+ while (num > 0) {
+ int runcount;
+ NCURSES_CH_T ntext0;
+
+ while (num > 1 && !CharEq(ntext[0], ntext[1])) {
+ PutChar(CHREF(ntext[0]));
+ ntext++;
+ num--;
+ }
+ ntext0 = ntext[0];
+ if (num == 1) {
+ PutChar(CHREF(ntext0));
+ return 0;
+ }
+ runcount = 2;
+
+ while (runcount < num && CharEq(ntext[runcount], ntext0))
+ runcount++;
+
+ /*
+ * The cost expression in the middle isn't exactly right.
+ * _cup_ch_cost is an upper bound on the cost for moving to the
+ * end of the erased area, but not the cost itself (which we
+ * can't compute without emitting the move). This may result
+ * in erase_chars not getting used in some situations for
+ * which it would be marginally advantageous.
+ */
+ if (erase_chars
+ && runcount > SP->_ech_cost + SP->_cup_ch_cost
+ && can_clear_with(CHREF(ntext0))) {
+ UpdateAttrs(ntext0);
+ putp(TPARM_1(erase_chars, runcount));
+
+ /*
+ * If this is the last part of the given interval,
+ * don't bother moving cursor, since it can be the
+ * last update on the line.
+ */
+ if (runcount < num) {
+ GoTo(SP->_cursrow, SP->_curscol + runcount);
+ } else {
+ return 1; /* cursor stays in the middle */
+ }
+ } else if (repeat_char && runcount > SP->_rep_cost) {
+ bool wrap_possible = (SP->_curscol + runcount >= screen_columns);
+ int rep_count = runcount;
+
+ if (wrap_possible)
+ rep_count--;
+
+ UpdateAttrs(ntext0);
+ tputs(TPARM_2(repeat_char, CharOf(ntext0), rep_count),
+ rep_count, _nc_outch);
+ SP->_curscol += rep_count;
+
+ if (wrap_possible)
+ PutChar(CHREF(ntext0));
+ } else {
+ for (i = 0; i < runcount; i++)
+ PutChar(CHREF(ntext[i]));
+ }
+ ntext += runcount;
+ num -= runcount;
+ }
+ return 0;
+ }
+
+ for (i = 0; i < num; i++)
+ PutChar(CHREF(ntext[i]));
+ return 0;
+}
+
+/*
+ * Output the line in the given range [first .. last]
+ *
+ * If there's a run of identical characters that's long enough to justify
+ * cursor movement, use that also.
+ *
+ * Returns: same as EmitRange
+ */
+static int
+PutRange(const NCURSES_CH_T * otext,
+ const NCURSES_CH_T * ntext,
+ int row,
+ int first, int last)
+{
+ int i, j, same;
+
+ TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)",
+ otext, ntext, row, first, last));
+
+ if (otext != ntext
+ && (last - first + 1) > SP->_inline_cost) {
+ for (j = first, same = 0; j <= last; j++) {
+ if (!same && isWidecExt(otext[j]))
+ continue;
+ if (CharEq(otext[j], ntext[j])) {
+ same++;
+ } else {
+ if (same > SP->_inline_cost) {
+ EmitRange(ntext + first, j - same - first);
+ GoTo(row, first = j);
+ }
+ same = 0;
+ }
+ }
+ i = EmitRange(ntext + first, j - same - first);
+ /*
+ * Always return 1 for the next GoTo() after a PutRange() if we found
+ * identical characters at end of interval
+ */
+ return (same == 0 ? i : 1);
+ }
+ return EmitRange(ntext + first, last - first + 1);
+}
+
+/* leave unbracketed here so 'indent' works */
+#define MARK_NOCHANGE(win,row) \
+ win->_line[row].firstchar = _NOCHANGE; \
+ win->_line[row].lastchar = _NOCHANGE; \
+ if_USE_SCROLL_HINTS(win->_line[row].oldindex = row)
+
+NCURSES_EXPORT(int)
+doupdate(void)
+{
+ int i;
+ int nonempty;
+#if USE_TRACE_TIMES
+ struct tms before, after;
+#endif /* USE_TRACE_TIMES */
+
+ T((T_CALLED("doupdate()")));
+
+ if (curscr == 0
+ || newscr == 0)
+ returnCode(ERR);
+
+#ifdef TRACE
+ if (USE_TRACEF(TRACE_UPDATE)) {
+ if (curscr->_clear)
+ _tracef("curscr is clear");
+ else
+ _tracedump("curscr", curscr);
+ _tracedump("newscr", newscr);
+ _nc_unlock_global(tracef);
+ }
+#endif /* TRACE */
+
+ _nc_signal_handler(FALSE);
+
+ if (SP->_fifohold)
+ SP->_fifohold--;
+
+#if USE_SIZECHANGE
+ if (SP->_endwin || _nc_handle_sigwinch(SP)) {
+ /*
+ * This is a transparent extension: XSI does not address it,
+ * and applications need not know that ncurses can do it.
+ *
+ * Check if the terminal size has changed while curses was off
+ * (this can happen in an xterm, for example), and resize the
+ * ncurses data structures accordingly.
+ */
+ _nc_update_screensize(SP);
+ }
+#endif
+
+ if (SP->_endwin) {
+
+ T(("coming back from shell mode"));
+ reset_prog_mode();
+
+ _nc_mvcur_resume();
+ _nc_screen_resume();
+ SP->_mouse_resume(SP);
+
+ SP->_endwin = FALSE;
+ }
+#if USE_TRACE_TIMES
+ /* zero the metering machinery */
+ RESET_OUTCHARS();
+ (void) times(&before);
+#endif /* USE_TRACE_TIMES */
+
+ /*
+ * This is the support for magic-cookie terminals. The theory: we scan
+ * the virtual screen looking for attribute turnons. Where we find one,
+ * check to make sure it's realizable by seeing if the required number of
+ * un-attributed blanks are present before and after the attributed range;
+ * try to shift the range boundaries over blanks (not changing the screen
+ * display) so this becomes true. If it is, shift the beginning attribute
+ * change appropriately (the end one, if we've gotten this far, is
+ * guaranteed room for its cookie). If not, nuke the added attributes out
+ * of the span.
+ */
+#if USE_XMC_SUPPORT
+ if (magic_cookie_glitch > 0) {
+ int j, k;
+ attr_t rattr = A_NORMAL;
+
+ for (i = 0; i < screen_lines; i++) {
+ for (j = 0; j < screen_columns; j++) {
+ bool failed = FALSE;
+ NCURSES_CH_T *thisline = newscr->_line[i].text;
+ attr_t thisattr = AttrOf(thisline[j]) & SP->_xmc_triggers;
+ attr_t turnon = thisattr & ~rattr;
+
+ /* is an attribute turned on here? */
+ if (turnon == 0) {
+ rattr = thisattr;
+ continue;
+ }
+
+ TR(TRACE_ATTRS, ("At (%d, %d): from %s...", i, j, _traceattr(rattr)));
+ TR(TRACE_ATTRS, ("...to %s", _traceattr(turnon)));
+
+ /*
+ * If the attribute change location is a blank with a "safe"
+ * attribute, undo the attribute turnon. This may ensure
+ * there's enough room to set the attribute before the first
+ * non-blank in the run.
+ */
+#define SAFE(a) (!((a) & SP->_xmc_triggers))
+ if (ISBLANK(thisline[j]) && SAFE(turnon)) {
+ RemAttr(thisline[j], turnon);
+ continue;
+ }
+
+ /* check that there's enough room at start of span */
+ for (k = 1; k <= magic_cookie_glitch; k++) {
+ if (j - k < 0
+ || !ISBLANK(thisline[j - k])
+ || !SAFE(AttrOf(thisline[j - k]))) {
+ failed = TRUE;
+ TR(TRACE_ATTRS, ("No room at start in %d,%d%s%s",
+ i, j - k,
+ (ISBLANK(thisline[j - k])
+ ? ""
+ : ":nonblank"),
+ (SAFE(AttrOf(thisline[j - k]))
+ ? ""
+ : ":unsafe")));
+ break;
+ }
+ }
+ if (!failed) {
+ bool end_onscreen = FALSE;
+ int m, n = j;
+
+ /* find end of span, if it's onscreen */
+ for (m = i; m < screen_lines; m++) {
+ for (; n < screen_columns; n++) {
+ attr_t testattr = AttrOf(newscr->_line[m].text[n]);
+ if ((testattr & SP->_xmc_triggers) == rattr) {
+ end_onscreen = TRUE;
+ TR(TRACE_ATTRS,
+ ("Range attributed with %s ends at (%d, %d)",
+ _traceattr(turnon), m, n));
+ goto foundit;
+ }
+ }
+ n = 0;
+ }
+ TR(TRACE_ATTRS,
+ ("Range attributed with %s ends offscreen",
+ _traceattr(turnon)));
+ foundit:;
+
+ if (end_onscreen) {
+ NCURSES_CH_T *lastline = newscr->_line[m].text;
+
+ /*
+ * If there are safely-attributed blanks at the end of
+ * the range, shorten the range. This will help ensure
+ * that there is enough room at end of span.
+ */
+ while (n >= 0
+ && ISBLANK(lastline[n])
+ && SAFE(AttrOf(lastline[n]))) {
+ RemAttr(lastline[n--], turnon);
+ }
+
+ /* check that there's enough room at end of span */
+ for (k = 1; k <= magic_cookie_glitch; k++) {
+ if (n + k >= screen_columns
+ || !ISBLANK(lastline[n + k])
+ || !SAFE(AttrOf(lastline[n + k]))) {
+ failed = TRUE;
+ TR(TRACE_ATTRS,
+ ("No room at end in %d,%d%s%s",
+ i, j - k,
+ (ISBLANK(lastline[n + k])
+ ? ""
+ : ":nonblank"),
+ (SAFE(AttrOf(lastline[n + k]))
+ ? ""
+ : ":unsafe")));
+ break;
+ }
+ }
+ }
+ }
+
+ if (failed) {
+ int p, q = j;
+
+ TR(TRACE_ATTRS,
+ ("Clearing %s beginning at (%d, %d)",
+ _traceattr(turnon), i, j));
+
+ /* turn off new attributes over span */
+ for (p = i; p < screen_lines; p++) {
+ for (; q < screen_columns; q++) {
+ attr_t testattr = AttrOf(newscr->_line[p].text[q]);
+ if ((testattr & SP->_xmc_triggers) == rattr)
+ goto foundend;
+ RemAttr(newscr->_line[p].text[q], turnon);
+ }
+ q = 0;
+ }
+ foundend:;
+ } else {
+ TR(TRACE_ATTRS,
+ ("Cookie space for %s found before (%d, %d)",
+ _traceattr(turnon), i, j));
+
+ /*
+ * Back up the start of range so there's room for cookies
+ * before the first nonblank character.
+ */
+ for (k = 1; k <= magic_cookie_glitch; k++)
+ AddAttr(thisline[j - k], turnon);
+ }
+
+ rattr = thisattr;
+ }
+ }
+
+#ifdef TRACE
+ /* show altered highlights after magic-cookie check */
+ if (USE_TRACEF(TRACE_UPDATE)) {
+ _tracef("After magic-cookie check...");
+ _tracedump("newscr", newscr);
+ _nc_unlock_global(tracef);
+ }
+#endif /* TRACE */
+ }
+#endif /* USE_XMC_SUPPORT */
+
+ nonempty = 0;
+ if (curscr->_clear || newscr->_clear) { /* force refresh ? */
+ ClrUpdate();
+ curscr->_clear = FALSE; /* reset flag */
+ newscr->_clear = FALSE; /* reset flag */
+ } else {
+ int changedlines = CHECK_INTERVAL;
+
+ if (check_pending())
+ goto cleanup;
+
+ nonempty = min(screen_lines, newscr->_maxy + 1);
+
+ if (SP->_scrolling) {
+ _nc_scroll_optimize();
+ }
+
+ nonempty = ClrBottom(nonempty);
+
+ TR(TRACE_UPDATE, ("Transforming lines, nonempty %d", nonempty));
+ for (i = 0; i < nonempty; i++) {
+ /*
+ * Here is our line-breakout optimization.
+ */
+ if (changedlines == CHECK_INTERVAL) {
+ if (check_pending())
+ goto cleanup;
+ changedlines = 0;
+ }
+
+ /*
+ * newscr->line[i].firstchar is normally set
+ * by wnoutrefresh. curscr->line[i].firstchar
+ * is normally set by _nc_scroll_window in the
+ * vertical-movement optimization code,
+ */
+ if (newscr->_line[i].firstchar != _NOCHANGE
+ || curscr->_line[i].firstchar != _NOCHANGE) {
+ TransformLine(i);
+ changedlines++;
+ }
+
+ /* mark line changed successfully */
+ if (i <= newscr->_maxy) {
+ MARK_NOCHANGE(newscr, i);
+ }
+ if (i <= curscr->_maxy) {
+ MARK_NOCHANGE(curscr, i);
+ }
+ }
+ }
+
+ /* put everything back in sync */
+ for (i = nonempty; i <= newscr->_maxy; i++) {
+ MARK_NOCHANGE(newscr, i);
+ }
+ for (i = nonempty; i <= curscr->_maxy; i++) {
+ MARK_NOCHANGE(curscr, i);
+ }
+
+ if (!newscr->_leaveok) {
+ curscr->_curx = newscr->_curx;
+ curscr->_cury = newscr->_cury;
+
+ GoTo(curscr->_cury, curscr->_curx);
+ }
+
+ cleanup:
+ /*
+ * We would like to keep the physical screen in normal mode in case we get
+ * other processes writing to the screen. This goal cannot be met for
+ * magic cookies since it interferes with attributes that may propagate
+ * past the current position.
+ */
+#if USE_XMC_SUPPORT
+ if (magic_cookie_glitch != 0)
+#endif
+ UpdateAttrs(normal);
+
+ _nc_flush();
+ WINDOW_ATTRS(curscr) = WINDOW_ATTRS(newscr);
+
+#if USE_TRACE_TIMES
+ (void) times(&after);
+ TR(TRACE_TIMES,
+ ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time",
+ _nc_outchars,
+ (long) (after.tms_stime - before.tms_stime),
+ (long) (after.tms_utime - before.tms_utime)));
+#endif /* USE_TRACE_TIMES */
+
+ _nc_signal_handler(TRUE);
+
+ returnCode(OK);
+}
+
+/*
+ * ClrBlank(win)
+ *
+ * Returns the attributed character that corresponds to the "cleared"
+ * screen. If the terminal has the back-color-erase feature, this will be
+ * colored according to the wbkgd() call.
+ *
+ * We treat 'curscr' specially because it isn't supposed to be set directly
+ * in the wbkgd() call. Assume 'stdscr' for this case.
+ */
+#define BCE_ATTRS (A_NORMAL|A_COLOR)
+#define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_nc_bkgd)
+
+static NCURSES_INLINE NCURSES_CH_T
+ClrBlank(WINDOW *win)
+{
+ NCURSES_CH_T blank = blankchar;
+ if (back_color_erase)
+ AddAttr(blank, (AttrOf(BCE_BKGD(win)) & BCE_ATTRS));
+ return blank;
+}
+
+/*
+** ClrUpdate()
+**
+** Update by clearing and redrawing the entire screen.
+**
+*/
+
+static void
+ClrUpdate(void)
+{
+ int i;
+ NCURSES_CH_T blank = ClrBlank(stdscr);
+ int nonempty = min(screen_lines, newscr->_maxy + 1);
+
+ TR(TRACE_UPDATE, (T_CALLED("ClrUpdate")));
+
+ ClearScreen(blank);
+
+ TR(TRACE_UPDATE, ("updating screen from scratch"));
+
+ nonempty = ClrBottom(nonempty);
+
+ for (i = 0; i < nonempty; i++)
+ TransformLine(i);
+
+ TR(TRACE_UPDATE, (T_RETURN("")));
+}
+
+/*
+** ClrToEOL(blank)
+**
+** Clear to end of current line, starting at the cursor position
+*/
+
+static void
+ClrToEOL(NCURSES_CH_T blank, bool needclear)
+{
+ int j;
+
+ if (curscr != 0
+ && SP->_cursrow >= 0) {
+ for (j = SP->_curscol; j < screen_columns; j++) {
+ if (j >= 0) {
+ NCURSES_CH_T *cp = &(curscr->_line[SP->_cursrow].text[j]);
+
+ if (!CharEq(*cp, blank)) {
+ *cp = blank;
+ needclear = TRUE;
+ }
+ }
+ }
+ } else {
+ needclear = TRUE;
+ }
+
+ if (needclear) {
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eol");
+ if (clr_eol && SP->_el_cost <= (screen_columns - SP->_curscol)) {
+ putp(clr_eol);
+ } else {
+ int count = (screen_columns - SP->_curscol);
+ while (count-- > 0)
+ PutChar(CHREF(blank));
+ }
+ }
+}
+
+/*
+** ClrToEOS(blank)
+**
+** Clear to end of screen, starting at the cursor position
+*/
+
+static void
+ClrToEOS(NCURSES_CH_T blank)
+{
+ int row, col;
+
+ row = SP->_cursrow;
+ col = SP->_curscol;
+
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eos");
+ tputs(clr_eos, screen_lines - row, _nc_outch);
+
+ while (col < screen_columns)
+ curscr->_line[row].text[col++] = blank;
+
+ for (row++; row < screen_lines; row++) {
+ for (col = 0; col < screen_columns; col++)
+ curscr->_line[row].text[col] = blank;
+ }
+}
+
+/*
+ * ClrBottom(total)
+ *
+ * Test if clearing the end of the screen would satisfy part of the
+ * screen-update. Do this by scanning backwards through the lines in the
+ * screen, checking if each is blank, and one or more are changed.
+ */
+static int
+ClrBottom(int total)
+{
+ int row;
+ int col;
+ int top = total;
+ int last = min(screen_columns, newscr->_maxx + 1);
+ NCURSES_CH_T blank = newscr->_line[total - 1].text[last - 1];
+ bool ok;
+
+ if (clr_eos && can_clear_with(CHREF(blank))) {
+
+ for (row = total - 1; row >= 0; row--) {
+ for (col = 0, ok = TRUE; ok && col < last; col++) {
+ ok = (CharEq(newscr->_line[row].text[col], blank));
+ }
+ if (!ok)
+ break;
+
+ for (col = 0; ok && col < last; col++) {
+ ok = (CharEq(curscr->_line[row].text[col], blank));
+ }
+ if (!ok)
+ top = row;
+ }
+
+ /* don't use clr_eos for just one line if clr_eol available */
+ if (top < total) {
+ GoTo(top, 0);
+ ClrToEOS(blank);
+ if (SP->oldhash && SP->newhash) {
+ for (row = top; row < screen_lines; row++)
+ SP->oldhash[row] = SP->newhash[row];
+ }
+ }
+ }
+ return top;
+}
+
+#if USE_XMC_SUPPORT
+#if USE_WIDEC_SUPPORT
+#define check_xmc_transition(a, b) \
+ ((((a)->attr ^ (b)->attr) & ~((a)->attr) & SP->_xmc_triggers) != 0)
+#define xmc_turn_on(a,b) check_xmc_transition(&(a), &(b))
+#else
+#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0)
+#endif
+
+#define xmc_new(r,c) newscr->_line[r].text[c]
+#define xmc_turn_off(a,b) xmc_turn_on(b,a)
+#endif /* USE_XMC_SUPPORT */
+
+/*
+** TransformLine(lineno)
+**
+** Transform the given line in curscr to the one in newscr, using
+** Insert/Delete Character if _nc_idcok && has_ic().
+**
+** firstChar = position of first different character in line
+** oLastChar = position of last different character in old line
+** nLastChar = position of last different character in new line
+**
+** move to firstChar
+** overwrite chars up to min(oLastChar, nLastChar)
+** if oLastChar < nLastChar
+** insert newLine[oLastChar+1..nLastChar]
+** else
+** delete oLastChar - nLastChar spaces
+*/
+
+static void
+TransformLine(int const lineno)
+{
+ int firstChar, oLastChar, nLastChar;
+ NCURSES_CH_T *newLine = newscr->_line[lineno].text;
+ NCURSES_CH_T *oldLine = curscr->_line[lineno].text;
+ int n;
+ bool attrchanged = FALSE;
+
+ TR(TRACE_UPDATE, (T_CALLED("TransformLine(%d)"), lineno));
+
+ /* copy new hash value to old one */
+ if (SP->oldhash && SP->newhash)
+ SP->oldhash[lineno] = SP->newhash[lineno];
+
+ /*
+ * If we have colors, there is the possibility of having two color pairs
+ * that display as the same colors. For instance, Lynx does this. Check
+ * for this case, and update the old line with the new line's colors when
+ * they are equivalent.
+ */
+ if (SP->_coloron) {
+ int oldPair;
+ int newPair;
+
+ for (n = 0; n < screen_columns; n++) {
+ if (!CharEq(newLine[n], oldLine[n])) {
+ oldPair = GetPair(oldLine[n]);
+ newPair = GetPair(newLine[n]);
+ if (oldPair != newPair
+ && unColor(oldLine[n]) == unColor(newLine[n])) {
+ if (oldPair < COLOR_PAIRS
+ && newPair < COLOR_PAIRS
+ && SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) {
+ SetPair(oldLine[n], GetPair(newLine[n]));
+ }
+ }
+ }
+ }
+ }
+
+ if (ceol_standout_glitch && clr_eol) {
+ firstChar = 0;
+ while (firstChar < screen_columns) {
+ if (!SameAttrOf(newLine[firstChar], oldLine[firstChar])) {
+ attrchanged = TRUE;
+ break;
+ }
+ firstChar++;
+ }
+ }
+
+ firstChar = 0;
+
+ if (attrchanged) { /* we may have to disregard the whole line */
+ GoTo(lineno, firstChar);
+ ClrToEOL(ClrBlank(curscr), FALSE);
+ PutRange(oldLine, newLine, lineno, 0, (screen_columns - 1));
+#if USE_XMC_SUPPORT
+
+ /*
+ * This is a very simple loop to paint characters which may have the
+ * magic cookie glitch embedded. It doesn't know much about video
+ * attributes which are continued from one line to the next. It
+ * assumes that we have filtered out requests for attribute changes
+ * that do not get mapped to blank positions.
+ *
+ * FIXME: we are not keeping track of where we put the cookies, so this
+ * will work properly only once, since we may overwrite a cookie in a
+ * following operation.
+ */
+ } else if (magic_cookie_glitch > 0) {
+ GoTo(lineno, firstChar);
+ for (n = 0; n < screen_columns; n++) {
+ int m = n + magic_cookie_glitch;
+
+ /* check for turn-on:
+ * If we are writing an attributed blank, where the
+ * previous cell is not attributed.
+ */
+ if (ISBLANK(newLine[n])
+ && ((n > 0
+ && xmc_turn_on(newLine[n - 1], newLine[n]))
+ || (n == 0
+ && lineno > 0
+ && xmc_turn_on(xmc_new(lineno - 1, screen_columns - 1),
+ newLine[n])))) {
+ n = m;
+ }
+
+ PutChar(CHREF(newLine[n]));
+
+ /* check for turn-off:
+ * If we are writing an attributed non-blank, where the
+ * next cell is blank, and not attributed.
+ */
+ if (!ISBLANK(newLine[n])
+ && ((n + 1 < screen_columns
+ && xmc_turn_off(newLine[n], newLine[n + 1]))
+ || (n + 1 >= screen_columns
+ && lineno + 1 < screen_lines
+ && xmc_turn_off(newLine[n], xmc_new(lineno + 1, 0))))) {
+ n = m;
+ }
+
+ }
+#endif
+ } else {
+ NCURSES_CH_T blank;
+
+ /* it may be cheap to clear leading whitespace with clr_bol */
+ blank = newLine[0];
+ if (clr_bol && can_clear_with(CHREF(blank))) {
+ int oFirstChar, nFirstChar;
+
+ for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++)
+ if (!CharEq(oldLine[oFirstChar], blank))
+ break;
+ for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++)
+ if (!CharEq(newLine[nFirstChar], blank))
+ break;
+
+ if (nFirstChar == oFirstChar) {
+ firstChar = nFirstChar;
+ /* find the first differing character */
+ while (firstChar < screen_columns
+ && CharEq(newLine[firstChar], oldLine[firstChar]))
+ firstChar++;
+ } else if (oFirstChar > nFirstChar) {
+ firstChar = nFirstChar;
+ } else { /* oFirstChar < nFirstChar */
+ firstChar = oFirstChar;
+ if (SP->_el1_cost < nFirstChar - oFirstChar) {
+ if (nFirstChar >= screen_columns
+ && SP->_el_cost <= SP->_el1_cost) {
+ GoTo(lineno, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eol");
+ putp(clr_eol);
+ } else {
+ GoTo(lineno, nFirstChar - 1);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_bol");
+ putp(clr_bol);
+ }
+
+ while (firstChar < nFirstChar)
+ oldLine[firstChar++] = blank;
+ }
+ }
+ } else {
+ /* find the first differing character */
+ while (firstChar < screen_columns
+ && CharEq(newLine[firstChar], oldLine[firstChar]))
+ firstChar++;
+ }
+ /* if there wasn't one, we're done */
+ if (firstChar >= screen_columns) {
+ TR(TRACE_UPDATE, (T_RETURN("")));
+ return;
+ }
+
+ blank = newLine[screen_columns - 1];
+
+ if (!can_clear_with(CHREF(blank))) {
+ /* find the last differing character */
+ nLastChar = screen_columns - 1;
+
+ while (nLastChar > firstChar
+ && CharEq(newLine[nLastChar], oldLine[nLastChar]))
+ nLastChar--;
+
+ if (nLastChar >= firstChar) {
+ GoTo(lineno, firstChar);
+ PutRange(oldLine, newLine, lineno, firstChar, nLastChar);
+ memcpy(oldLine + firstChar,
+ newLine + firstChar,
+ (nLastChar - firstChar + 1) * sizeof(NCURSES_CH_T));
+ }
+ TR(TRACE_UPDATE, (T_RETURN("")));
+ return;
+ }
+
+ /* find last non-blank character on old line */
+ oLastChar = screen_columns - 1;
+ while (oLastChar > firstChar && CharEq(oldLine[oLastChar], blank))
+ oLastChar--;
+
+ /* find last non-blank character on new line */
+ nLastChar = screen_columns - 1;
+ while (nLastChar > firstChar && CharEq(newLine[nLastChar], blank))
+ nLastChar--;
+
+ if ((nLastChar == firstChar)
+ && (SP->_el_cost < (oLastChar - nLastChar))) {
+ GoTo(lineno, firstChar);
+ if (!CharEq(newLine[firstChar], blank))
+ PutChar(CHREF(newLine[firstChar]));
+ ClrToEOL(blank, FALSE);
+ } else if ((nLastChar != oLastChar)
+ && (!CharEq(newLine[nLastChar], oldLine[oLastChar])
+ || !(_nc_idcok && has_ic()))) {
+ GoTo(lineno, firstChar);
+ if ((oLastChar - nLastChar) > SP->_el_cost) {
+ if (PutRange(oldLine, newLine, lineno, firstChar, nLastChar))
+ GoTo(lineno, nLastChar + 1);
+ ClrToEOL(blank, FALSE);
+ } else {
+ n = max(nLastChar, oLastChar);
+ PutRange(oldLine, newLine, lineno, firstChar, n);
+ }
+ } else {
+ int nLastNonblank = nLastChar;
+ int oLastNonblank = oLastChar;
+
+ /* find the last characters that really differ */
+ /* can be -1 if no characters differ */
+ while (CharEq(newLine[nLastChar], oldLine[oLastChar])) {
+ /* don't split a wide char */
+ if (isWidecExt(newLine[nLastChar]) &&
+ !CharEq(newLine[nLastChar - 1], oldLine[oLastChar - 1]))
+ break;
+ nLastChar--;
+ oLastChar--;
+ if (nLastChar == -1 || oLastChar == -1)
+ break;
+ }
+
+ n = min(oLastChar, nLastChar);
+ if (n >= firstChar) {
+ GoTo(lineno, firstChar);
+ PutRange(oldLine, newLine, lineno, firstChar, n);
+ }
+
+ if (oLastChar < nLastChar) {
+ int m = max(nLastNonblank, oLastNonblank);
+#if USE_WIDEC_SUPPORT
+ while (isWidecExt(newLine[n + 1]) && n) {
+ --n;
+ --oLastChar;
+ }
+#endif
+ GoTo(lineno, n + 1);
+ if ((nLastChar < nLastNonblank)
+ || InsCharCost(nLastChar - oLastChar) > (m - n)) {
+ PutRange(oldLine, newLine, lineno, n + 1, m);
+ } else {
+ InsStr(&newLine[n + 1], nLastChar - oLastChar);
+ }
+ } else if (oLastChar > nLastChar) {
+ GoTo(lineno, n + 1);
+ if (DelCharCost(oLastChar - nLastChar)
+ > SP->_el_cost + nLastNonblank - (n + 1)) {
+ if (PutRange(oldLine, newLine, lineno,
+ n + 1, nLastNonblank))
+ GoTo(lineno, nLastNonblank + 1);
+ ClrToEOL(blank, FALSE);
+ } else {
+ /*
+ * The delete-char sequence will
+ * effectively shift in blanks from the
+ * right margin of the screen. Ensure
+ * that they are the right color by
+ * setting the video attributes from
+ * the last character on the row.
+ */
+ UpdateAttrs(blank);
+ DelChar(oLastChar - nLastChar);
+ }
+ }
+ }
+ }
+
+ /* update the code's internal representation */
+ if (screen_columns > firstChar)
+ memcpy(oldLine + firstChar,
+ newLine + firstChar,
+ (screen_columns - firstChar) * sizeof(NCURSES_CH_T));
+ TR(TRACE_UPDATE, (T_RETURN("")));
+ return;
+}
+
+/*
+** ClearScreen(blank)
+**
+** Clear the physical screen and put cursor at home
+**
+*/
+
+static void
+ClearScreen(NCURSES_CH_T blank)
+{
+ int i, j;
+ bool fast_clear = (clear_screen || clr_eos || clr_eol);
+
+ TR(TRACE_UPDATE, ("ClearScreen() called"));
+
+#if NCURSES_EXT_FUNCS
+ if (SP->_coloron
+ && !SP->_default_color) {
+ _nc_do_color(GET_SCREEN_PAIR(SP), 0, FALSE, _nc_outch);
+ if (!back_color_erase) {
+ fast_clear = FALSE;
+ }
+ }
+#endif
+
+ if (fast_clear) {
+ if (clear_screen) {
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clear_screen");
+ putp(clear_screen);
+ SP->_cursrow = SP->_curscol = 0;
+ position_check(SP->_cursrow, SP->_curscol, "ClearScreen");
+ } else if (clr_eos) {
+ SP->_cursrow = SP->_curscol = -1;
+ GoTo(0, 0);
+
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eos");
+ tputs(clr_eos, screen_lines, _nc_outch);
+ } else if (clr_eol) {
+ SP->_cursrow = SP->_curscol = -1;
+
+ UpdateAttrs(blank);
+ for (i = 0; i < screen_lines; i++) {
+ GoTo(i, 0);
+ TPUTS_TRACE("clr_eol");
+ putp(clr_eol);
+ }
+ GoTo(0, 0);
+ }
+ } else {
+ UpdateAttrs(blank);
+ for (i = 0; i < screen_lines; i++) {
+ GoTo(i, 0);
+ for (j = 0; j < screen_columns; j++)
+ PutChar(CHREF(blank));
+ }
+ GoTo(0, 0);
+ }
+
+ for (i = 0; i < screen_lines; i++) {
+ for (j = 0; j < screen_columns; j++)
+ curscr->_line[i].text[j] = blank;
+ }
+
+ TR(TRACE_UPDATE, ("screen cleared"));
+}
+
+/*
+** InsStr(line, count)
+**
+** Insert the count characters pointed to by line.
+**
+*/
+
+static void
+InsStr(NCURSES_CH_T * line, int count)
+{
+ TR(TRACE_UPDATE, ("InsStr(%p,%d) called", line, count));
+
+ /* Prefer parm_ich as it has the smallest cost - no need to shift
+ * the whole line on each character. */
+ /* The order must match that of InsCharCost. */
+ if (parm_ich) {
+ TPUTS_TRACE("parm_ich");
+ tputs(TPARM_1(parm_ich, count), count, _nc_outch);
+ while (count) {
+ PutAttrChar(CHREF(*line));
+ line++;
+ count--;
+ }
+ } else if (enter_insert_mode && exit_insert_mode) {
+ TPUTS_TRACE("enter_insert_mode");
+ putp(enter_insert_mode);
+ while (count) {
+ PutAttrChar(CHREF(*line));
+ if (insert_padding) {
+ TPUTS_TRACE("insert_padding");
+ putp(insert_padding);
+ }
+ line++;
+ count--;
+ }
+ TPUTS_TRACE("exit_insert_mode");
+ putp(exit_insert_mode);
+ } else {
+ while (count) {
+ TPUTS_TRACE("insert_character");
+ putp(insert_character);
+ PutAttrChar(CHREF(*line));
+ if (insert_padding) {
+ TPUTS_TRACE("insert_padding");
+ putp(insert_padding);
+ }
+ line++;
+ count--;
+ }
+ }
+ position_check(SP->_cursrow, SP->_curscol, "InsStr");
+}
+
+/*
+** DelChar(count)
+**
+** Delete count characters at current position
+**
+*/
+
+static void
+DelChar(int count)
+{
+ int n;
+
+ TR(TRACE_UPDATE, ("DelChar(%d) called, position = (%ld,%ld)",
+ count,
+ (long) newscr->_cury,
+ (long) newscr->_curx));
+
+ if (parm_dch) {
+ TPUTS_TRACE("parm_dch");
+ tputs(TPARM_1(parm_dch, count), count, _nc_outch);
+ } else {
+ for (n = 0; n < count; n++) {
+ TPUTS_TRACE("delete_character");
+ putp(delete_character);
+ }
+ }
+}
+
+/*
+ * Physical-scrolling support
+ *
+ * This code was adapted from Keith Bostic's hardware scrolling
+ * support for 4.4BSD curses. I (esr) translated it to use terminfo
+ * capabilities, narrowed the call interface slightly, and cleaned
+ * up some convoluted tests. I also added support for the memory_above
+ * memory_below, and non_dest_scroll_region capabilities.
+ *
+ * For this code to work, we must have either
+ * change_scroll_region and scroll forward/reverse commands, or
+ * insert and delete line capabilities.
+ * When the scrolling region has been set, the cursor has to
+ * be at the last line of the region to make the scroll up
+ * happen, or on the first line of region to scroll down.
+ *
+ * This code makes one aesthetic decision in the opposite way from
+ * BSD curses. BSD curses preferred pairs of il/dl operations
+ * over scrolls, allegedly because il/dl looked faster. We, on
+ * the other hand, prefer scrolls because (a) they're just as fast
+ * on many terminals and (b) using them avoids bouncing an
+ * unchanged bottom section of the screen up and down, which is
+ * visually nasty.
+ *
+ * (lav): added more cases, used dl/il when bot==maxy and in csr case.
+ *
+ * I used assumption that capabilities il/il1/dl/dl1 work inside
+ * changed scroll region not shifting screen contents outside of it.
+ * If there are any terminals behaving different way, it would be
+ * necessary to add some conditions to scroll_csr_forward/backward.
+ */
+
+/* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */
+static int
+scroll_csr_forward(int n, int top, int bot, int miny, int maxy, NCURSES_CH_T blank)
+{
+ int i;
+
+ if (n == 1 && scroll_forward && top == miny && bot == maxy) {
+ GoTo(bot, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("scroll_forward");
+ putp(scroll_forward);
+ } else if (n == 1 && delete_line && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("delete_line");
+ putp(delete_line);
+ } else if (parm_index && top == miny && bot == maxy) {
+ GoTo(bot, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("parm_index");
+ tputs(TPARM_2(parm_index, n, 0), n, _nc_outch);
+ } else if (parm_delete_line && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("parm_delete_line");
+ tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch);
+ } else if (scroll_forward && top == miny && bot == maxy) {
+ GoTo(bot, 0);
+ UpdateAttrs(blank);
+ for (i = 0; i < n; i++) {
+ TPUTS_TRACE("scroll_forward");
+ putp(scroll_forward);
+ }
+ } else if (delete_line && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ for (i = 0; i < n; i++) {
+ TPUTS_TRACE("delete_line");
+ putp(delete_line);
+ }
+ } else
+ return ERR;
+
+#if NCURSES_EXT_FUNCS
+ if (FILL_BCE()) {
+ int j;
+ for (i = 0; i < n; i++) {
+ GoTo(bot - i, 0);
+ for (j = 0; j < screen_columns; j++)
+ PutChar(CHREF(blank));
+ }
+ }
+#endif
+ return OK;
+}
+
+/* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */
+/* n > 0 */
+static int
+scroll_csr_backward(int n, int top, int bot, int miny, int maxy,
+ NCURSES_CH_T blank)
+{
+ int i;
+
+ if (n == 1 && scroll_reverse && top == miny && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("scroll_reverse");
+ putp(scroll_reverse);
+ } else if (n == 1 && insert_line && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("insert_line");
+ putp(insert_line);
+ } else if (parm_rindex && top == miny && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("parm_rindex");
+ tputs(TPARM_2(parm_rindex, n, 0), n, _nc_outch);
+ } else if (parm_insert_line && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("parm_insert_line");
+ tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch);
+ } else if (scroll_reverse && top == miny && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ for (i = 0; i < n; i++) {
+ TPUTS_TRACE("scroll_reverse");
+ putp(scroll_reverse);
+ }
+ } else if (insert_line && bot == maxy) {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ for (i = 0; i < n; i++) {
+ TPUTS_TRACE("insert_line");
+ putp(insert_line);
+ }
+ } else
+ return ERR;
+
+#if NCURSES_EXT_FUNCS
+ if (FILL_BCE()) {
+ int j;
+ for (i = 0; i < n; i++) {
+ GoTo(top + i, 0);
+ for (j = 0; j < screen_columns; j++)
+ PutChar(CHREF(blank));
+ }
+ }
+#endif
+ return OK;
+}
+
+/* scroll by using delete_line at del and insert_line at ins */
+/* n > 0 */
+static int
+scroll_idl(int n, int del, int ins, NCURSES_CH_T blank)
+{
+ int i;
+
+ if (!((parm_delete_line || delete_line) && (parm_insert_line || insert_line)))
+ return ERR;
+
+ GoTo(del, 0);
+ UpdateAttrs(blank);
+ if (n == 1 && delete_line) {
+ TPUTS_TRACE("delete_line");
+ putp(delete_line);
+ } else if (parm_delete_line) {
+ TPUTS_TRACE("parm_delete_line");
+ tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch);
+ } else { /* if (delete_line) */
+ for (i = 0; i < n; i++) {
+ TPUTS_TRACE("delete_line");
+ putp(delete_line);
+ }
+ }
+
+ GoTo(ins, 0);
+ UpdateAttrs(blank);
+ if (n == 1 && insert_line) {
+ TPUTS_TRACE("insert_line");
+ putp(insert_line);
+ } else if (parm_insert_line) {
+ TPUTS_TRACE("parm_insert_line");
+ tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch);
+ } else { /* if (insert_line) */
+ for (i = 0; i < n; i++) {
+ TPUTS_TRACE("insert_line");
+ putp(insert_line);
+ }
+ }
+
+ return OK;
+}
+
+/*
+ * Note: some terminals require the cursor to be within the scrolling margins
+ * before setting them. Generally, the cursor must be at the appropriate end
+ * of the scrolling margins when issuing an indexing operation (it is not
+ * apparent whether it must also be at the left margin; we do this just to be
+ * safe). To make the related cursor movement a little faster, we use the
+ * save/restore cursor capabilities if the terminal has them.
+ */
+NCURSES_EXPORT(int)
+_nc_scrolln(int n, int top, int bot, int maxy)
+/* scroll region from top to bot by n lines */
+{
+ NCURSES_CH_T blank = ClrBlank(stdscr);
+ int i;
+ bool cursor_saved = FALSE;
+ int res;
+
+ TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy));
+
+#if USE_XMC_SUPPORT
+ /*
+ * If we scroll, we might remove a cookie.
+ */
+ if (magic_cookie_glitch > 0) {
+ return (ERR);
+ }
+#endif
+
+ if (n > 0) { /* scroll up (forward) */
+ /*
+ * Explicitly clear if stuff pushed off top of region might
+ * be saved by the terminal.
+ */
+ res = scroll_csr_forward(n, top, bot, 0, maxy, blank);
+
+ if (res == ERR && change_scroll_region) {
+ if ((((n == 1 && scroll_forward) || parm_index)
+ && (SP->_cursrow == bot || SP->_cursrow == bot - 1))
+ && save_cursor && restore_cursor) {
+ cursor_saved = TRUE;
+ TPUTS_TRACE("save_cursor");
+ putp(save_cursor);
+ }
+ TPUTS_TRACE("change_scroll_region");
+ putp(TPARM_2(change_scroll_region, top, bot));
+ if (cursor_saved) {
+ TPUTS_TRACE("restore_cursor");
+ putp(restore_cursor);
+ } else {
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ res = scroll_csr_forward(n, top, bot, top, bot, blank);
+
+ TPUTS_TRACE("change_scroll_region");
+ putp(TPARM_2(change_scroll_region, 0, maxy));
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ if (res == ERR && _nc_idlok)
+ res = scroll_idl(n, top, bot - n + 1, blank);
+
+ /*
+ * Clear the newly shifted-in text.
+ */
+ if (res != ERR
+ && (non_dest_scroll_region || (memory_below && bot == maxy))) {
+ static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT);
+ if (bot == maxy && clr_eos) {
+ GoTo(bot - n + 1, 0);
+ ClrToEOS(blank2);
+ } else {
+ for (i = 0; i < n; i++) {
+ GoTo(bot - i, 0);
+ ClrToEOL(blank2, FALSE);
+ }
+ }
+ }
+
+ } else { /* (n < 0) - scroll down (backward) */
+ res = scroll_csr_backward(-n, top, bot, 0, maxy, blank);
+
+ if (res == ERR && change_scroll_region) {
+ if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top - 1)
+ && save_cursor && restore_cursor) {
+ cursor_saved = TRUE;
+ TPUTS_TRACE("save_cursor");
+ putp(save_cursor);
+ }
+ TPUTS_TRACE("change_scroll_region");
+ putp(TPARM_2(change_scroll_region, top, bot));
+ if (cursor_saved) {
+ TPUTS_TRACE("restore_cursor");
+ putp(restore_cursor);
+ } else {
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ res = scroll_csr_backward(-n, top, bot, top, bot, blank);
+
+ TPUTS_TRACE("change_scroll_region");
+ putp(TPARM_2(change_scroll_region, 0, maxy));
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ if (res == ERR && _nc_idlok)
+ res = scroll_idl(-n, bot + n + 1, top, blank);
+
+ /*
+ * Clear the newly shifted-in text.
+ */
+ if (res != ERR
+ && (non_dest_scroll_region || (memory_above && top == 0))) {
+ static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT);
+ for (i = 0; i < -n; i++) {
+ GoTo(i + top, 0);
+ ClrToEOL(blank2, FALSE);
+ }
+ }
+ }
+
+ if (res == ERR)
+ return (ERR);
+
+ _nc_scroll_window(curscr, n, top, bot, blank);
+
+ /* shift hash values too - they can be reused */
+ _nc_scroll_oldhash(n, top, bot);
+
+ return (OK);
+}
+
+NCURSES_EXPORT(void)
+_nc_screen_resume(void)
+{
+ /* make sure terminal is in a sane known state */
+ SetAttr(SCREEN_ATTRS(SP), A_NORMAL);
+ newscr->_clear = TRUE;
+
+ /* reset color pairs and definitions */
+ if (SP->_coloron || SP->_color_defs)
+ _nc_reset_colors();
+
+ /* restore user-defined colors, if any */
+ if (SP->_color_defs < 0) {
+ int n;
+ SP->_color_defs = -(SP->_color_defs);
+ for (n = 0; n < SP->_color_defs; ++n) {
+ if (SP->_color_table[n].init) {
+ init_color(n,
+ SP->_color_table[n].r,
+ SP->_color_table[n].g,
+ SP->_color_table[n].b);
+ }
+ }
+ }
+
+ if (exit_attribute_mode)
+ putp(exit_attribute_mode);
+ else {
+ /* turn off attributes */
+ if (exit_alt_charset_mode)
+ putp(exit_alt_charset_mode);
+ if (exit_standout_mode)
+ putp(exit_standout_mode);
+ if (exit_underline_mode)
+ putp(exit_underline_mode);
+ }
+ if (exit_insert_mode)
+ putp(exit_insert_mode);
+ if (enter_am_mode && exit_am_mode)
+ putp(auto_right_margin ? enter_am_mode : exit_am_mode);
+}
+
+NCURSES_EXPORT(void)
+_nc_screen_init(void)
+{
+ _nc_screen_resume();
+}
+
+/* wrap up screen handling */
+NCURSES_EXPORT(void)
+_nc_screen_wrap(void)
+{
+ UpdateAttrs(normal);
+#if NCURSES_EXT_FUNCS
+ if (SP->_coloron
+ && !SP->_default_color) {
+ static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
+ SP->_default_color = TRUE;
+ _nc_do_color(-1, 0, FALSE, _nc_outch);
+ SP->_default_color = FALSE;
+
+ mvcur(SP->_cursrow, SP->_curscol, screen_lines - 1, 0);
+
+ ClrToEOL(blank, TRUE);
+ }
+#endif
+ if (SP->_color_defs) {
+ _nc_reset_colors();
+ }
+}
+
+#if USE_XMC_SUPPORT
+NCURSES_EXPORT(void)
+_nc_do_xmc_glitch(attr_t previous)
+{
+ attr_t chg = XMC_CHANGES(previous ^ AttrOf(SCREEN_ATTRS(SP)));
+
+ while (chg != 0) {
+ if (chg & 1) {
+ SP->_curscol += magic_cookie_glitch;
+ if (SP->_curscol >= SP->_columns)
+ wrap_cursor();
+ TR(TRACE_UPDATE, ("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol));
+ }
+ chg >>= 1;
+ }
+}
+#endif /* USE_XMC_SUPPORT */