diff options
Diffstat (limited to 'ncurses-5.3/ncurses/tty/tty_update.c')
| -rw-r--r-- | ncurses-5.3/ncurses/tty/tty_update.c | 1841 |
1 files changed, 1841 insertions, 0 deletions
diff --git a/ncurses-5.3/ncurses/tty/tty_update.c b/ncurses-5.3/ncurses/tty/tty_update.c new file mode 100644 index 0000000..ce0bbf4 --- /dev/null +++ b/ncurses-5.3/ncurses/tty/tty_update.c @@ -0,0 +1,1841 @@ +/**************************************************************************** + * Copyright (c) 1998-2001,2002 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> + +#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 <term.h> + +MODULE_ID("$Id$") + +/* + * 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) + +/* + * 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 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 inline void +GoTo(int const row, int const col) +{ + attr_t oldattr = SP->_current_attr; + + TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)", + row, col, SP->_cursrow, SP->_curscol)); + + position_check(SP->_cursrow, SP->_curscol, "GoTo"); + + /* + * 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; + position_check(SP->_cursrow, SP->_curscol, "GoTo2"); +} + +static inline void +PutAttrChar(CARG_CH_T ch) +{ + PUTC_DATA; + NCURSES_CH_T tilde; + + if (tilde_glitch && (CharOfD(ch) == L('~'))) { + SetChar(tilde, L('`'), AttrOfD(ch)); + ch = CHREF(tilde); + } + + TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)", + _tracech_t(ch), + SP->_cursrow, SP->_curscol)); + UpdateAttrs(AttrOfD(ch)); +#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((int) ch); + } else +#endif + { + PUTC(CHDEREF(ch), SP->_ofp); /* macro's fastest... */ +#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 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); + } +} + +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--; + } + position_check(SP->_cursrow, SP->_curscol, "wrap_cursor"); +} + +static 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 inline bool +can_clear_with(ARG_CH_T ch) +{ + if (!back_color_erase && SP->_coloron) { +#if NCURSES_EXT_FUNCS + if (!SP->_default_color) + return FALSE; + if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK) + return FALSE; + if (AttrOfD(ch) & A_COLOR) { + short fg, bg; + pair_content(PAIR_NUMBER(AttrOfD(ch)), &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; + + 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(AttrOf(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(AttrOf(ntext0)); + putp(tparm(repeat_char, CharOf(ntext0), rep_count)); + 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 j, run; + + 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, run = 0; j <= last; j++) { + if (!run && isnac(otext[j])) + continue; + if (CharEq(otext[j], ntext[j])) { + run++; + } else { + if (run > SP->_inline_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); +} + +/* 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()"))); + +#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; + attr_t 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; + } + + 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) & (attr_t)~NONBLANK_ATTR)) + if (ISBLANK(newscr->_line[i].text[j]) && SAFE(turnon)) { + RemAttr(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 + || !ISBLANK(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; + 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; + } + } + + 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++) { + if (AttrOf(newscr->_line[p].text[q]) == 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(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 ? */ + TR(TRACE_UPDATE, ("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); + + 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: + /* + * Keep the physical screen in normal mode in case we get other + * processes writing to the screen. + */ + UpdateAttrs(A_NORMAL); + + _nc_flush(); + curscr->_attrs = newscr->_attrs; + +#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 inline NCURSES_CH_T +ClrBlank(WINDOW *win) +{ + NCURSES_CH_T blank = NewChar(BLANK_TEXT); + 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, ("ClrUpdate() called")); + + ClearScreen(blank); + + TR(TRACE_UPDATE, ("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(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(AttrOf(blank)); + TPUTS_TRACE("clr_eol"); + if (SP->_el_cost > (screen_columns - SP->_curscol)) { + int count = (screen_columns - SP->_curscol); + while (count-- > 0) + PutChar(CHREF(blank)); + } else { + putp(clr_eol); + } + } +} + +/* +** 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(AttrOf(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 = ClrBlank(stdscr); + 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 - 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]; + } + } + } + return total; +} + +#if USE_XMC_SUPPORT +#if USE_WIDEC_SUPPORT +static inline bool +check_xmc_transition(NCURSES_CH_T * a, NCURSES_CH_T * b) +{ + if (((a->attr ^ b->attr) & ~(a->attr) & SP->_xmc_triggers) != 0) { + return TRUE; + } + return FALSE; +} +#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, ("TransformLine(%d) called", lineno)); + + /* copy new hash value to old one */ + if (SP->oldhash && SP->newhash) + SP->oldhash[lineno] = SP->newhash[lineno]; + +#define ColorOf(n) (AttrOf(n) & A_COLOR) +#define unColor(n) (AttrOf(n) & ALL_BUT_COLOR) + /* + * 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) { + attr_t oldColor; + attr_t newColor; + int oldPair; + int newPair; + + for (n = 0; n < screen_columns; n++) { + if (!CharEq(newLine[n], oldLine[n])) { + oldColor = ColorOf(oldLine[n]); + newColor = ColorOf(newLine[n]); + if (oldColor != newColor + && unColor(oldLine[n]) == unColor(newLine[n])) { + oldPair = PAIR_NUMBER(oldColor); + newPair = PAIR_NUMBER(newColor); + if (oldPair < COLOR_PAIRS + && newPair < COLOR_PAIRS + && SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) { + RemAttr(oldLine[n], A_COLOR); + AddAttr(oldLine[n], ColorOf(newLine[n])); + } + } + } + } + } + + 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), 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; + + /* 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) + return; + + /* it may be cheap to clear leading whitespace with clr_bol */ + if (clr_bol && (blank = newLine[0], 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 + SP->_el1_cost) { + if (nFirstChar >= screen_columns && SP->_el_cost <= SP->_el1_cost) { + GoTo(lineno, 0); + UpdateAttrs(AttrOf(blank)); + TPUTS_TRACE("clr_eol"); + putp(clr_eol); + } else { + GoTo(lineno, nFirstChar - 1); + UpdateAttrs(AttrOf(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(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)); + } + 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 (isnac(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); + 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, 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(AttrOf(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)); +} + +/* +** 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((int) COLOR_PAIR(SP->_current_attr), 0, FALSE, _nc_outch); + if (!back_color_erase) { + fast_clear = FALSE; + } + } +#endif + + if (fast_clear) { + if (clear_screen) { + UpdateAttrs(AttrOf(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(AttrOf(blank)); + TPUTS_TRACE("clr_eos"); + putp(clr_eos); + } else if (clr_eol) { + SP->_cursrow = SP->_curscol = -1; + + UpdateAttrs(AttrOf(blank)); + for (i = 0; i < screen_lines; i++) { + GoTo(i, 0); + TPUTS_TRACE("clr_eol"); + putp(clr_eol); + } + GoTo(0, 0); + } + } else { + UpdateAttrs(AttrOf(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(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 = (%d,%d)", count, + newscr->_cury, newscr->_curx)); + + if (parm_dch) { + TPUTS_TRACE("parm_dch"); + tputs(tparm(parm_dch, count), count, _nc_outch); + } else { + for (n = 0; n < count; n++) { + TPUTS_TRACE("delete_character"); + putp(delete_character); + } + } +} + +/* +** _nc_outstr(char *str) +** +** Emit a string without waiting for update. +*/ + +NCURSES_EXPORT(void) +_nc_outstr(const char *str) +{ + (void) putp(str); + _nc_flush(); +} + +/* + * 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(AttrOf(blank)); + TPUTS_TRACE("scroll_forward"); + tputs(scroll_forward, 0, _nc_outch); + } else if (n == 1 && delete_line && bot == maxy) { + GoTo(top, 0); + UpdateAttrs(AttrOf(blank)); + TPUTS_TRACE("delete_line"); + tputs(delete_line, 0, _nc_outch); + } else if (parm_index && top == miny && bot == maxy) { + GoTo(bot, 0); + UpdateAttrs(AttrOf(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(AttrOf(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(AttrOf(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(AttrOf(blank)); + for (i = 0; i < n; i++) { + TPUTS_TRACE("delete_line"); + tputs(delete_line, 0, _nc_outch); + } + } 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(AttrOf(blank)); + TPUTS_TRACE("scroll_reverse"); + tputs(scroll_reverse, 0, _nc_outch); + } else if (n == 1 && insert_line && bot == maxy) { + GoTo(top, 0); + UpdateAttrs(AttrOf(blank)); + TPUTS_TRACE("insert_line"); + tputs(insert_line, 0, _nc_outch); + } else if (parm_rindex && top == miny && bot == maxy) { + GoTo(top, 0); + UpdateAttrs(AttrOf(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(AttrOf(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(AttrOf(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(AttrOf(blank)); + for (i = 0; i < n; i++) { + TPUTS_TRACE("insert_line"); + tputs(insert_line, 0, _nc_outch); + } + } 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(AttrOf(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(AttrOf(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; +} + +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"); + 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); + + /* + * Clear the newly shifted-in text. + */ + if (res != ERR + && (non_dest_scroll_region || (memory_below && bot == maxy))) { + NCURSES_CH_T blank2 = NewChar(BLANK_TEXT); + if (bot == maxy && clr_eos) { + GoTo(bot - n, 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"); + 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); + + /* + * Clear the newly shifted-in text. + */ + if (res != ERR + && (non_dest_scroll_region || (memory_above && top == 0))) { + 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 */ + SP->_current_attr = 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(A_NORMAL); +#if NCURSES_EXT_FUNCS + if (SP->_coloron + && !SP->_default_color) { + 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); + SP->_cursrow = screen_lines - 1; + SP->_curscol = 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 ^ SP->_current_attr); + + 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 */ |