/* $OpenBSD: tty_update.c,v 1.17 2020/05/29 20:46:13 nicm Exp $ */ /**************************************************************************** * 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 1992,1995 * * and: Eric S. Raymond * * 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 #if defined __HAIKU__ && defined __BEOS__ #undef __BEOS__ #endif #ifdef __BEOS__ #undef false #undef true #include #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 #endif #if USE_TRACE_TIMES #include #endif #if USE_FUNC_POLL #elif HAVE_SELECT #if HAVE_SYS_SELECT_H #include #endif #endif #include #include MODULE_ID("$Id: tty_update.c,v 1.17 2020/05/29 20:46:13 nicm 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 && #if BSD_TPUTS !isdigit(UChar(CharOf(ntext0))) && #endif 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 */