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authorPeter Wemm <peter@FreeBSD.org>1999-08-24 01:06:48 +0000
committerPeter Wemm <peter@FreeBSD.org>1999-08-24 01:06:48 +0000
commit0e3d540892016a47f6a68ec9ba2879d35ce5f7c2 (patch)
treead214c5b2c8142ad6dc6d2ce3a9c83e6317d7f77 /contrib/ncurses/ncurses/tty/tty_update.c
downloadsrc-0e3d540892016a47f6a68ec9ba2879d35ce5f7c2.tar.gz
src-0e3d540892016a47f6a68ec9ba2879d35ce5f7c2.zip
Import unmodified (but trimmed) ncurses 5.0 prerelease 990821.vendor/ncurses/5.0-19990821
This contains the full eti (panel, form, menu) extensions. bmake glue to follow. Obtained from: ftp://ftp.clark.net/pub/dickey/ncurses
Notes
Notes: svn path=/vendor/ncurses/dist/; revision=50276 svn path=/vendor/ncurses/5.0-19990821/; revision=50278; tag=vendor/ncurses/5.0-19990821
Diffstat (limited to 'contrib/ncurses/ncurses/tty/tty_update.c')
-rw-r--r--contrib/ncurses/ncurses/tty/tty_update.c1738
1 files changed, 1738 insertions, 0 deletions
diff --git a/contrib/ncurses/ncurses/tty/tty_update.c b/contrib/ncurses/ncurses/tty/tty_update.c
new file mode 100644
index 000000000000..4118d357f561
--- /dev/null
+++ b/contrib/ncurses/ncurses/tty/tty_update.c
@@ -0,0 +1,1738 @@
+/****************************************************************************
+ * Copyright (c) 1998 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> *
+ ****************************************************************************/
+
+
+/*-----------------------------------------------------------------
+ *
+ * lib_doupdate.c
+ *
+ * The routine doupdate() and its dependents. Also _nc_outstr(),
+ * so all physical output is concentrated here (except _nc_outch()
+ * in lib_tputs.c).
+ *
+ *-----------------------------------------------------------------*/
+
+#include <curses.priv.h>
+
+#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
+#include <stropts.h>
+#include <poll.h>
+#elif HAVE_SELECT
+#if HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#endif
+
+#ifdef __BEOS__
+/* BeOS select() only works on sockets. Use the tty hack instead */
+#include <socket.h>
+#define select check_select
+#endif
+
+#include <term.h>
+
+MODULE_ID("$Id: tty_update.c,v 1.111 1999/02/27 20:07:56 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
+
+/*
+ * 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 inline chtype ClrBlank ( WINDOW *win );
+static int ClrBottom(int total);
+static int InsStr( chtype *line, int count );
+static void ClearScreen( chtype blank );
+static void ClrUpdate( void );
+static void DelChar( int count );
+static void TransformLine( int const lineno );
+
+#ifdef POSITION_DEBUG
+/****************************************************************************
+ *
+ * Debugging code. Only works on ANSI-standard terminals.
+ *
+ ****************************************************************************/
+
+void position_check(int expected_y, int expected_x, char *legend)
+/* check to see if the real cursor position matches the virtual */
+{
+ static char buf[9];
+ int y, x;
+
+ if (_nc_tracing)
+ return;
+
+ memset(buf, '\0', sizeof(buf));
+ (void) write(1, "\033[6n", 4); /* only works on ANSI-compatibles */
+ (void) read(0, (void *)buf, 8);
+ _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 (y - 1 != expected_y || x - 1 != expected_x)
+ _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);
+}
+#endif /* POSITION_DEBUG */
+
+/****************************************************************************
+ *
+ * Optimized update code
+ *
+ ****************************************************************************/
+
+static inline void GoTo(int const row, int const col)
+{
+ chtype oldattr = SP->_current_attr;
+
+ TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)",
+ row, col, SP->_cursrow, SP->_curscol));
+
+#ifdef POSITION_DEBUG
+ position_check(SP->_cursrow, SP->_curscol, "GoTo");
+#endif /* POSITION_DEBUG */
+
+ /*
+ * Force restore even if msgr is on when we're in an alternate
+ * character set -- these have a strong tendency to screw up the
+ * CR & LF used for local character motions!
+ */
+ if ((oldattr & A_ALTCHARSET)
+ || (oldattr && !move_standout_mode))
+ {
+ TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move",
+ oldattr, _traceattr(oldattr)));
+ vidattr(A_NORMAL);
+ }
+
+ mvcur(SP->_cursrow, SP->_curscol, row, col);
+ SP->_cursrow = row;
+ SP->_curscol = col;
+}
+
+static inline void PutAttrChar(chtype ch)
+{
+ if (tilde_glitch && (TextOf(ch) == '~'))
+ ch = ('`' | AttrOf(ch));
+
+ TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)",
+ _tracechtype(ch),
+ SP->_cursrow, SP->_curscol));
+ UpdateAttrs(ch);
+ putc((int)TextOf(ch), SP->_ofp);
+#ifdef TRACE
+ _nc_outchars++;
+#endif /* TRACE */
+ SP->_curscol++;
+ 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 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;
+ fflush(SP->_ofp);
+ }
+ return FALSE;
+}
+
+/*
+ * No one supports recursive inline functions. However, gcc is quieter if we
+ * instantiate the recursive part separately.
+ */
+#if CC_HAS_INLINE_FUNCS
+static void callPutChar(chtype const);
+#else
+#define callPutChar(ch) PutChar(ch)
+#endif
+
+static inline void PutChar(chtype const ch); /* forward declaration */
+
+/* put char at lower right corner */
+static void PutCharLR(chtype const 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);
+
+ 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);
+ callPutChar(ch);
+ GoTo(screen_lines-1,screen_columns-2);
+ InsStr(newscr->_line[screen_lines-1].text+screen_columns-2,1);
+ }
+}
+
+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++;
+ }
+ else
+ {
+ SP->_curscol--;
+ }
+}
+
+static inline void PutChar(chtype const 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();
+
+#ifdef POSITION_DEBUG
+ position_check(SP->_cursrow, SP->_curscol, "PutChar");
+#endif /* POSITION_DEBUG */
+}
+
+/*
+ * 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 chtype *ntext, int num)
+{
+ int i;
+
+ if (erase_chars || repeat_char)
+ {
+ while (num > 0)
+ {
+ int runcount;
+ chtype ntext0;
+
+ while (num>1 && ntext[0]!=ntext[1])
+ {
+ PutChar(ntext[0]);
+ ntext++;
+ num--;
+ }
+ ntext0 = ntext[0];
+ if (num==1)
+ {
+ PutChar(ntext0);
+ return 0;
+ }
+ runcount = 2;
+
+ while (runcount < num && ntext[runcount] == ntext0)
+ runcount++;
+
+ /*
+ * The cost expression in the middle isn't exactly right.
+ * _cup_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_cost
+ && can_clear_with(ntext0))
+ {
+ UpdateAttrs(ntext0);
+ putp(tparm(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);
+ putp(tparm(repeat_char, TextOf(ntext0), rep_count));
+ SP->_curscol += rep_count;
+
+ if (wrap_possible)
+ PutChar(ntext0);
+ }
+ else
+ {
+ for (i = 0; i < runcount; i++)
+ PutChar(ntext[i]);
+ }
+ ntext += runcount;
+ num -= runcount;
+ }
+ return 0;
+ }
+
+ for (i = 0; i < num; i++)
+ PutChar(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 chtype *otext,
+ const chtype *ntext,
+ int row,
+ int first, int last)
+{
+ int j, run;
+ int cost = min(SP->_cup_ch_cost, SP->_hpa_ch_cost);
+
+ TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)",
+ otext, ntext, row, first, last));
+
+ if (otext != ntext
+ && (last-first+1) > cost) {
+ for (j = first, run = 0; j <= last; j++) {
+ if (otext[j] == ntext[j]) {
+ run++;
+ } else {
+ if (run > cost) {
+ int before_run = (j - run);
+ EmitRange(ntext+first, before_run-first);
+ GoTo(row, first = j);
+ }
+ run = 0;
+ }
+ }
+ }
+ return EmitRange(ntext + first, last-first+1);
+}
+
+#if CC_HAS_INLINE_FUNCS
+static void callPutChar(chtype const ch)
+{
+ PutChar(ch);
+}
+#endif
+
+#define MARK_NOCHANGE(win,row) \
+ { \
+ win->_line[row].firstchar = _NOCHANGE; \
+ win->_line[row].lastchar = _NOCHANGE; \
+ if_USE_SCROLL_HINTS(win->_line[row].oldindex = row); \
+ }
+
+int doupdate(void)
+{
+int i;
+int nonempty;
+#if USE_TRACE_TIMES
+struct tms before, after;
+#endif /* USE_TRACE_TIMES */
+
+ T((T_CALLED("doupdate()")));
+
+#ifdef TRACE
+ if (_nc_tracing & TRACE_UPDATE)
+ {
+ if (curscr->_clear)
+ _tracef("curscr is clear");
+ else
+ _tracedump("curscr", curscr);
+ _tracedump("newscr", newscr);
+ }
+#endif /* TRACE */
+
+ _nc_signal_handler(FALSE);
+
+ if (SP->_fifohold)
+ SP->_fifohold--;
+
+#if USE_SIZECHANGE
+ if (SP->_endwin || SP->_sig_winch)
+ {
+ /*
+ * 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();
+ }
+#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 */
+ _nc_outchars = 0;
+ (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;
+ chtype turnon = AttrOf(newscr->_line[i].text[j]) & ~rattr;
+
+ /* is an attribute turned on here? */
+ if (turnon == 0) {
+ rattr = AttrOf(newscr->_line[i].text[j]);
+ continue;
+ }
+
+ T(("At (%d, %d): from %s...", i, j, _traceattr(rattr)));
+ T(("...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) & (chtype)~NONBLANK_ATTR)
+ if (TextOf(newscr->_line[i].text[j])==' ' && SAFE(turnon))
+ {
+ newscr->_line[i].text[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
+ || TextOf(newscr->_line[i].text[j-k]) != ' '
+ || !SAFE(AttrOf(newscr->_line[i].text[j-k])))
+ failed = TRUE;
+ 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++)
+ {
+ if (AttrOf(newscr->_line[m].text[n]) == rattr)
+ {
+ end_onscreen = TRUE;
+ T(("Range attributed with %s ends at (%d, %d)",
+ _traceattr(turnon),m,n));
+ goto foundit;
+ }
+ }
+ n = 0;
+ }
+ T(("Range attributed with %s ends offscreen",
+ _traceattr(turnon)));
+ foundit:;
+
+ if (end_onscreen)
+ {
+ chtype *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
+ && TextOf(lastline[n]) == ' '
+ && SAFE(AttrOf(lastline[n])))
+ 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
+ || TextOf(lastline[n + k]) != ' '
+ || !SAFE(AttrOf(lastline[n+k])))
+ failed = TRUE;
+ }
+ }
+
+ if (failed)
+ {
+ int p, q = j;
+
+ T(("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++)
+ {
+ if (AttrOf(newscr->_line[p].text[q]) == rattr)
+ goto foundend;
+ newscr->_line[p].text[q] &= ~turnon;
+ }
+ q = 0;
+ }
+ foundend:;
+ }
+ else
+ {
+ T(("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++)
+ newscr->_line[i].text[j-k] |= turnon;
+ }
+
+ rattr = AttrOf(newscr->_line[i].text[j]);
+ }
+
+#ifdef TRACE
+ /* show altered highlights after magic-cookie check */
+ if (_nc_tracing & TRACE_UPDATE)
+ {
+ _tracef("After magic-cookie check...");
+ _tracedump("newscr", newscr);
+ }
+#endif /* TRACE */
+ }
+#endif /* USE_XMC_SUPPORT */
+
+ nonempty = 0;
+ if (curscr->_clear || newscr->_clear) { /* force refresh ? */
+ T(("clearing and updating from scratch"));
+ 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);
+
+ T(("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:
+ /*
+ * Keep the physical screen in normal mode in case we get other
+ * processes writing to the screen.
+ */
+ UpdateAttrs(A_NORMAL);
+
+ fflush(SP->_ofp);
+ curscr->_attrs = newscr->_attrs;
+/* curscr->_bkgd = newscr->_bkgd; */
+
+#if USE_TRACE_TIMES
+ (void) times(&after);
+ TR(TRACE_TIMES, ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time",
+ _nc_outchars,
+ after.tms_stime-before.tms_stime,
+ 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))->_bkgd)
+
+static inline chtype ClrBlank (WINDOW *win)
+{
+chtype blank = BLANK;
+ if (back_color_erase)
+ blank |= (BCE_BKGD(win) & BCE_ATTRS);
+ return blank;
+}
+
+/*
+** ClrUpdate()
+**
+** Update by clearing and redrawing the entire screen.
+**
+*/
+
+static void ClrUpdate(void)
+{
+ int i;
+ chtype blank = ClrBlank(stdscr);
+ int nonempty = min(screen_lines, newscr->_maxy+1);
+
+ T(("ClrUpdate() called"));
+
+ ClearScreen(blank);
+
+ T(("updating screen from scratch"));
+
+ nonempty = ClrBottom(nonempty);
+
+ for (i = 0; i < nonempty; i++)
+ TransformLine(i);
+}
+
+/*
+** ClrToEOL(blank)
+**
+** Clear to end of current line, starting at the cursor position
+*/
+
+static void ClrToEOL(chtype blank)
+{
+int j;
+bool needclear = FALSE;
+
+ for (j = SP->_curscol; j < screen_columns; j++)
+ {
+ chtype *cp = &(curscr->_line[SP->_cursrow].text[j]);
+
+ if (*cp != blank)
+ {
+ *cp = blank;
+ needclear = TRUE;
+ }
+ }
+
+ if (needclear)
+ {
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eol");
+ if (SP->_el_cost > (screen_columns - SP->_curscol))
+ {
+ int count = (screen_columns - SP->_curscol);
+ while (count-- > 0)
+ PutChar(blank);
+ }
+ else
+ putp(clr_eol);
+ }
+}
+
+/*
+** ClrToEOS(blank)
+**
+** Clear to end of screen, starting at the cursor position
+*/
+
+static void ClrToEOS(chtype blank)
+{
+int row, col;
+
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eos");
+ row = SP->_cursrow;
+ tputs(clr_eos, screen_lines-row, _nc_outch);
+
+ for (col = SP->_curscol; col < screen_columns; col++)
+ 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)
+{
+static chtype *tstLine;
+static size_t lenLine;
+
+int row, col;
+int top = total;
+int last = min(screen_columns, newscr->_maxx+1);
+size_t length = sizeof(chtype) * last;
+chtype blank = newscr->_line[total-1].text[last-1]; /* lower right char */
+
+ if(!clr_eos || !can_clear_with(blank))
+ return total;
+
+ if ((tstLine == 0) || (last > (int)lenLine)) {
+ tstLine = typeRealloc(chtype, last, tstLine);
+ }
+
+ if (tstLine != 0) {
+ lenLine = last;
+ for (col = 0; col < last; col++)
+ tstLine[col] = blank;
+
+ for (row = total-1; row >= 0; row--) {
+ if (memcmp(tstLine, newscr->_line[row].text, length))
+ break;
+ if (memcmp(tstLine, curscr->_line[row].text, length))
+ top = row;
+ }
+
+ /* don't use clr_eos for just one line if clr_eol available */
+ if (top < total-1 || (top < total && !clr_eol && !clr_bol)) {
+ GoTo(top,0);
+ ClrToEOS(blank);
+ total = top;
+ if (SP->oldhash && SP->newhash)
+ {
+ for (row = top; row < screen_lines; row++)
+ SP->oldhash[row] = SP->newhash[row];
+ }
+ }
+ }
+#if NO_LEAKS
+ if (tstLine != 0)
+ FreeAndNull(tstLine);
+#endif
+ return total;
+}
+
+
+/*
+** 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;
+chtype *newLine = newscr->_line[lineno].text;
+chtype *oldLine = curscr->_line[lineno].text;
+int n;
+bool attrchanged = FALSE;
+
+ T(("TransformLine(%d) called", lineno));
+
+ /* copy new hash value to old one */
+ if (SP->oldhash && SP->newhash)
+ SP->oldhash[lineno] = SP->newhash[lineno];
+
+ if(ceol_standout_glitch && clr_eol) {
+ firstChar = 0;
+ while(firstChar < screen_columns) {
+ if(AttrOf(newLine[firstChar]) != AttrOf(oldLine[firstChar]))
+ attrchanged = TRUE;
+ firstChar++;
+ }
+ }
+
+ firstChar = 0;
+
+ if (attrchanged) { /* we may have to disregard the whole line */
+ GoTo(lineno, firstChar);
+ ClrToEOL(ClrBlank(curscr));
+ PutRange(oldLine, newLine, lineno, 0, (screen_columns-1));
+#if USE_XMC_SUPPORT
+
+#define NEW(r,c) newscr->_line[r].text[c]
+#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0)
+#define xmc_turn_off(a,b) xmc_turn_on(b,a)
+
+ /*
+ * 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 (TextOf(newLine[n]) == ' '
+ && ((n > 0
+ && xmc_turn_on(newLine[n-1], newLine[n]))
+ || (n == 0
+ && lineno > 0
+ && xmc_turn_on(NEW(lineno-1,screen_columns-1), newLine[n])))) {
+ n = m;
+ }
+
+ PutChar(newLine[n]);
+
+ /* check for turn-off:
+ * If we are writing an attributed non-blank, where the
+ * next cell is blank, and not attributed.
+ */
+ if (TextOf(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], NEW(lineno+1,0))))) {
+ n = m;
+ }
+
+ }
+#undef NEW
+#endif
+ } else {
+ chtype blank;
+
+ /* find the first differing character */
+ while (firstChar < screen_columns &&
+ newLine[firstChar] == oldLine[firstChar])
+ firstChar++;
+
+ /* if there wasn't one, we're done */
+ if (firstChar >= screen_columns)
+ return;
+
+ /* it may be cheap to clear leading whitespace with clr_bol */
+ if (clr_bol && can_clear_with(blank=newLine[0]))
+ {
+ int oFirstChar, nFirstChar;
+
+ for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++)
+ if (oldLine[oFirstChar] != blank)
+ break;
+ for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++)
+ if (newLine[nFirstChar] != blank)
+ break;
+
+ if (nFirstChar > oFirstChar + SP->_el1_cost)
+ {
+ 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;
+
+ if (firstChar >= screen_columns)
+ return;
+ }
+ }
+
+ blank = newLine[screen_columns-1];
+
+ if(!can_clear_with(blank))
+ {
+ /* find the last differing character */
+ nLastChar = screen_columns - 1;
+
+ while (nLastChar > firstChar
+ && 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(chtype));
+ }
+ return;
+ }
+
+ /* find last non-blank character on old line */
+ oLastChar = screen_columns - 1;
+ while (oLastChar > firstChar && oldLine[oLastChar] == blank)
+ oLastChar--;
+
+ /* find last non-blank character on new line */
+ nLastChar = screen_columns - 1;
+ while (nLastChar > firstChar && newLine[nLastChar] == blank)
+ nLastChar--;
+
+ if((nLastChar == firstChar)
+ && (SP->_el_cost < (oLastChar - nLastChar))) {
+ GoTo(lineno, firstChar);
+ if(newLine[firstChar] != blank )
+ PutChar(newLine[firstChar]);
+ ClrToEOL(blank);
+ } else if( (nLastChar != oLastChar)
+ && (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);
+ } 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 */
+ while (newLine[nLastChar] == oldLine[oLastChar]) {
+ if (nLastChar != 0
+ && oLastChar != 0) {
+ nLastChar--;
+ oLastChar--;
+ } else {
+ 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);
+ GoTo(lineno, n+1);
+ if (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);
+ } 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(chtype));
+}
+
+/*
+** ClearScreen(blank)
+**
+** Clear the physical screen and put cursor at home
+**
+*/
+
+static void ClearScreen(chtype blank)
+{
+ int i, j;
+
+ T(("ClearScreen() called"));
+
+ if (clear_screen) {
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clear_screen");
+ putp(clear_screen);
+ SP->_cursrow = SP->_curscol = 0;
+#ifdef POSITION_DEBUG
+ position_check(SP->_cursrow, SP->_curscol, "ClearScreen");
+#endif /* POSITION_DEBUG */
+ } else if (clr_eos) {
+ SP->_cursrow = SP->_curscol = -1;
+ GoTo(0,0);
+
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eos");
+ putp(clr_eos);
+ } else if (clr_eol) {
+ SP->_cursrow = SP->_curscol = -1;
+
+ for (i = 0; i < screen_lines; i++) {
+ GoTo(i, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("clr_eol");
+ putp(clr_eol);
+ }
+ GoTo(0,0);
+ } else {
+ T(("cannot clear screen"));
+ return;
+ }
+
+ for (i = 0; i < screen_lines; i++) {
+ for (j = 0; j < screen_columns; j++)
+ curscr->_line[i].text[j] = blank;
+ }
+
+ T(("screen cleared"));
+}
+
+/*
+** InsStr(line, count)
+**
+** Insert the count characters pointed to by line.
+**
+*/
+
+static int InsStr(chtype *line, int count)
+{
+ T(("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(parm_ich, count), count, _nc_outch);
+ while (count) {
+ PutAttrChar(*line);
+ line++;
+ count--;
+ }
+ return(OK);
+ } else if (enter_insert_mode && exit_insert_mode) {
+ TPUTS_TRACE("enter_insert_mode");
+ putp(enter_insert_mode);
+ while (count) {
+ PutAttrChar(*line);
+ if (insert_padding)
+ {
+ TPUTS_TRACE("insert_padding");
+ putp(insert_padding);
+ }
+ line++;
+ count--;
+ }
+ TPUTS_TRACE("exit_insert_mode");
+ putp(exit_insert_mode);
+ return(OK);
+ } else {
+ while (count) {
+ TPUTS_TRACE("insert_character");
+ putp(insert_character);
+ PutAttrChar(*line);
+ if (insert_padding)
+ {
+ TPUTS_TRACE("insert_padding");
+ putp(insert_padding);
+ }
+ line++;
+ count--;
+ }
+ return(OK);
+ }
+}
+
+/*
+** DelChar(count)
+**
+** Delete count characters at current position
+**
+*/
+
+static void DelChar(int count)
+{
+ T(("DelChar(%d) called, position = (%d,%d)", count, newscr->_cury, newscr->_curx));
+
+ if (parm_dch) {
+ TPUTS_TRACE("parm_dch");
+ tputs(tparm(parm_dch, count), count, _nc_outch);
+ } else {
+ while (count--)
+ {
+ TPUTS_TRACE("delete_character");
+ putp(delete_character);
+ }
+ }
+}
+
+/*
+** _nc_outstr(char *str)
+**
+** Emit a string without waiting for update.
+*/
+
+void _nc_outstr(const char *str)
+{
+ FILE *ofp = SP ? SP->_ofp : stdout;
+
+ (void) fputs(str, ofp);
+ (void) fflush(ofp);
+
+#ifdef TRACE
+ _nc_outchars += strlen(str);
+#endif /* TRACE */
+}
+
+/*
+ * 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, chtype blank)
+{
+ int i;
+
+ if (n == 1 && scroll_forward && top == miny && bot == maxy)
+ {
+ GoTo(bot, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("scroll_forward");
+ tputs(scroll_forward, 0, _nc_outch);
+ }
+ else if (n == 1 && delete_line && bot == maxy)
+ {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("delete_line");
+ tputs(delete_line, 0, _nc_outch);
+ }
+ else if (parm_index && top == miny && bot == maxy)
+ {
+ GoTo(bot, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("parm_index");
+ tputs(tparm(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(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");
+ tputs(scroll_forward, 0, _nc_outch);
+ }
+ }
+ else if (delete_line && bot == maxy)
+ {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ for (i = 0; i < n; i++)
+ {
+ TPUTS_TRACE("delete_line");
+ tputs(delete_line, 0, _nc_outch);
+ }
+ }
+ else
+ return ERR;
+
+ 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, chtype blank)
+{
+ int i;
+
+ if (n == 1 && scroll_reverse && top == miny && bot == maxy)
+ {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("scroll_reverse");
+ tputs(scroll_reverse, 0, _nc_outch);
+ }
+ else if (n == 1 && insert_line && bot == maxy)
+ {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("insert_line");
+ tputs(insert_line, 0, _nc_outch);
+ }
+ else if (parm_rindex && top == miny && bot == maxy)
+ {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ TPUTS_TRACE("parm_rindex");
+ tputs(tparm(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(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");
+ tputs(scroll_reverse, 0, _nc_outch);
+ }
+ }
+ else if (insert_line && bot == maxy)
+ {
+ GoTo(top, 0);
+ UpdateAttrs(blank);
+ for (i = 0; i < n; i++)
+ {
+ TPUTS_TRACE("insert_line");
+ tputs(insert_line, 0, _nc_outch);
+ }
+ }
+ else
+ return ERR;
+
+ 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, chtype 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");
+ tputs(delete_line, 0, _nc_outch);
+ }
+ else if (parm_delete_line)
+ {
+ TPUTS_TRACE("parm_delete_line");
+ tputs(tparm(parm_delete_line, n, 0), n, _nc_outch);
+ }
+ else /* if (delete_line) */
+ {
+ for (i = 0; i < n; i++)
+ {
+ TPUTS_TRACE("delete_line");
+ tputs(delete_line, 0, _nc_outch);
+ }
+ }
+
+ GoTo(ins, 0);
+ UpdateAttrs(blank);
+ if (n == 1 && insert_line)
+ {
+ TPUTS_TRACE("insert_line");
+ tputs(insert_line, 0, _nc_outch);
+ }
+ else if (parm_insert_line)
+ {
+ TPUTS_TRACE("parm_insert_line");
+ tputs(tparm(parm_insert_line, n, 0), n, _nc_outch);
+ }
+ else /* if (insert_line) */
+ {
+ for (i = 0; i < n; i++)
+ {
+ TPUTS_TRACE("insert_line");
+ tputs(insert_line, 0, _nc_outch);
+ }
+ }
+
+ return OK;
+}
+
+int _nc_scrolln(int n, int top, int bot, int maxy)
+/* scroll region from top to bot by n lines */
+{
+ chtype 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.
+ */
+ if (non_dest_scroll_region || (memory_above && top == 0)) {
+ for (i = 0; i < n; i++)
+ {
+ GoTo(i, 0);
+ ClrToEOL(BLANK);
+ }
+ }
+
+ 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");
+ tputs(save_cursor, 0, _nc_outch);
+ }
+ TPUTS_TRACE("change_scroll_region");
+ tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch);
+ if (cursor_saved)
+ {
+ TPUTS_TRACE("restore_cursor");
+ tputs(restore_cursor, 0, _nc_outch);
+ }
+ else
+ {
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ res = scroll_csr_forward(n, top, bot, top, bot, blank);
+
+ TPUTS_TRACE("change_scroll_region");
+ tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch);
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ if (res == ERR && _nc_idlok)
+ res = scroll_idl(n, top, bot-n+1, blank);
+ }
+ else /* (n < 0) - scroll down (backward) */
+ {
+ /*
+ * Do explicit clear to end of region if it's possible that the
+ * terminal might hold on to stuff we push off the end.
+ */
+ if (non_dest_scroll_region || (memory_below && bot == maxy))
+ {
+ if (bot == maxy && clr_eos)
+ {
+ GoTo(maxy + n, 0);
+ ClrToEOS(BLANK);
+ }
+ else if (clr_eol)
+ {
+ for (i = 0; i < -n; i++)
+ {
+ GoTo(maxy + n + i, 0);
+ ClrToEOL(BLANK);
+ }
+ }
+ }
+
+ 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");
+ tputs(save_cursor, 0, _nc_outch);
+ }
+ TPUTS_TRACE("change_scroll_region");
+ tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch);
+ if (cursor_saved)
+ {
+ TPUTS_TRACE("restore_cursor");
+ tputs(restore_cursor, 0, _nc_outch);
+ }
+ else
+ {
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ res = scroll_csr_backward(-n, top, bot, top, bot, blank);
+
+ TPUTS_TRACE("change_scroll_region");
+ tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch);
+ SP->_cursrow = SP->_curscol = -1;
+ }
+
+ if (res == ERR && _nc_idlok)
+ res = scroll_idl(-n, bot+n+1, top, blank);
+ }
+
+ 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);
+}
+
+
+void _nc_screen_resume()
+{
+ /* make sure terminal is in a sane known state */
+ SP->_current_attr = A_NORMAL;
+ newscr->_clear = TRUE;
+
+ if (SP->_coloron == TRUE && orig_pair)
+ putp(orig_pair);
+ 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);
+}
+
+void _nc_screen_init()
+{
+ _nc_screen_resume();
+}
+
+/* wrap up screen handling */
+void _nc_screen_wrap()
+{
+ UpdateAttrs(A_NORMAL);
+}
+
+#if USE_XMC_SUPPORT
+void _nc_do_xmc_glitch(attr_t previous)
+{
+ attr_t chg = XMC_CHANGES(previous ^ SP->_current_attr);
+
+ while (chg != 0) {
+ if (chg & 1) {
+ SP->_curscol += magic_cookie_glitch;
+ if (SP->_curscol >= SP->_columns)
+ wrap_cursor();
+ T(("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol));
+ }
+ chg >>= 1;
+ }
+}
+#endif /* USE_XMC_SUPPORT */