1/**************************************************************************** 2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29/**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 * and: Thomas E. Dickey 1996-on * 33 ****************************************************************************/ 34 35/*----------------------------------------------------------------- 36 * 37 * lib_doupdate.c 38 * 39 * The routine doupdate() and its dependents. 40 * All physical output is concentrated here (except _nc_outch() 41 * in lib_tputs.c). 42 * 43 *-----------------------------------------------------------------*/ 44 45#include <curses.priv.h> 46 47#if defined __HAIKU__ && defined __BEOS__ 48#undef __BEOS__ 49#endif 50 51#ifdef __BEOS__ 52#undef false 53#undef true 54#include <OS.h> 55#endif 56 57#if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES 58#define USE_TRACE_TIMES 1 59#else 60#define USE_TRACE_TIMES 0 61#endif 62 63#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT 64#include <sys/time.h> 65#endif 66 67#if USE_TRACE_TIMES 68#include <sys/times.h> 69#endif 70 71#if USE_FUNC_POLL 72#elif HAVE_SELECT 73#if HAVE_SYS_SELECT_H 74#include <sys/select.h> 75#endif 76#endif 77 78#include <ctype.h> 79#include <term.h> 80 81MODULE_ID("$Id: tty_update.c,v 1.246 2008/08/30 20:08:19 tom Exp $") 82 83/* 84 * This define controls the line-breakout optimization. Every once in a 85 * while during screen refresh, we want to check for input and abort the 86 * update if there's some waiting. CHECK_INTERVAL controls the number of 87 * changed lines to be emitted between input checks. 88 * 89 * Note: Input-check-and-abort is no longer done if the screen is being 90 * updated from scratch. This is a feature, not a bug. 91 */ 92#define CHECK_INTERVAL 5 93 94#define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase) 95 96static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT); 97static NCURSES_CH_T normal = NewChar(BLANK_TEXT); 98 99/* 100 * Enable checking to see if doupdate and friends are tracking the true 101 * cursor position correctly. NOTE: this is a debugging hack which will 102 * work ONLY on ANSI-compatible terminals! 103 */ 104/* #define POSITION_DEBUG */ 105 106static NCURSES_INLINE NCURSES_CH_T ClrBlank(WINDOW *win); 107static int ClrBottom(int total); 108static void ClearScreen(NCURSES_CH_T blank); 109static void ClrUpdate(void); 110static void DelChar(int count); 111static void InsStr(NCURSES_CH_T * line, int count); 112static void TransformLine(int const lineno); 113 114#ifdef POSITION_DEBUG 115/**************************************************************************** 116 * 117 * Debugging code. Only works on ANSI-standard terminals. 118 * 119 ****************************************************************************/ 120 121static void 122position_check(int expected_y, int expected_x, char *legend) 123/* check to see if the real cursor position matches the virtual */ 124{ 125 char buf[20]; 126 char *s; 127 int y, x; 128 129 if (!_nc_tracing || (expected_y < 0 && expected_x < 0)) 130 return; 131 132 _nc_flush(); 133 memset(buf, '\0', sizeof(buf)); 134 putp("\033[6n"); /* only works on ANSI-compatibles */ 135 _nc_flush(); 136 *(s = buf) = 0; 137 do { 138 int ask = sizeof(buf) - 1 - (s - buf); 139 int got = read(0, s, ask); 140 if (got == 0) 141 break; 142 s += got; 143 } while (strchr(buf, 'R') == 0); 144 _tracef("probe returned %s", _nc_visbuf(buf)); 145 146 /* try to interpret as a position report */ 147 if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) { 148 _tracef("position probe failed in %s", legend); 149 } else { 150 if (expected_x < 0) 151 expected_x = x - 1; 152 if (expected_y < 0) 153 expected_y = y - 1; 154 if (y - 1 != expected_y || x - 1 != expected_x) { 155 beep(); 156 tputs(tparm("\033[%d;%dH", expected_y + 1, expected_x + 1), 1, _nc_outch); 157 _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s", 158 y - 1, x - 1, expected_y, expected_x, legend); 159 } else { 160 _tracef("position matches OK in %s", legend); 161 } 162 } 163} 164#else 165#define position_check(expected_y, expected_x, legend) /* nothing */ 166#endif /* POSITION_DEBUG */ 167 168/**************************************************************************** 169 * 170 * Optimized update code 171 * 172 ****************************************************************************/ 173 174static NCURSES_INLINE void 175GoTo(int const row, int const col) 176{ 177 TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)", 178 row, col, SP->_cursrow, SP->_curscol)); 179 180 position_check(SP->_cursrow, SP->_curscol, "GoTo"); 181 182 mvcur(SP->_cursrow, SP->_curscol, row, col); 183 position_check(SP->_cursrow, SP->_curscol, "GoTo2"); 184} 185 186static NCURSES_INLINE void 187PutAttrChar(CARG_CH_T ch) 188{ 189 int chlen = 1; 190 NCURSES_CH_T my_ch; 191 PUTC_DATA; 192 NCURSES_CH_T tilde; 193 NCURSES_CH_T attr = CHDEREF(ch); 194 195 TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)", 196 _tracech_t(ch), 197 SP->_cursrow, SP->_curscol)); 198#if USE_WIDEC_SUPPORT 199 /* 200 * If this is not a valid character, there is nothing more to do. 201 */ 202 if (isWidecExt(CHDEREF(ch))) { 203 TR(TRACE_CHARPUT, ("...skip")); 204 return; 205 } 206 /* 207 * Determine the number of character cells which the 'ch' value will use 208 * on the screen. It should be at least one. 209 */ 210 if ((chlen = wcwidth(CharOf(CHDEREF(ch)))) <= 0) { 211 static const NCURSES_CH_T blank = NewChar(BLANK_TEXT); 212 213 /* 214 * If the character falls into any of these special cases, do 215 * not force the result to a blank: 216 * 217 * a) it is printable (this works around a bug in wcwidth()). 218 * b) use_legacy_coding() has been called to modify the treatment 219 * of codes 128-255. 220 * c) the acs_map[] has been initialized to allow codes 0-31 221 * to be rendered. This supports Linux console's "PC" 222 * characters. Codes 128-255 are allowed though this is 223 * not checked. 224 */ 225 if (is8bits(CharOf(CHDEREF(ch))) 226 && (isprint(CharOf(CHDEREF(ch))) 227 || (SP->_legacy_coding > 0 && CharOf(CHDEREF(ch)) >= 160) 228 || (SP->_legacy_coding > 1 && CharOf(CHDEREF(ch)) >= 128) 229 || (AttrOf(attr) & A_ALTCHARSET 230 && ((CharOfD(ch) < ACS_LEN 231 && SP->_acs_map != 0 232 && SP->_acs_map[CharOfD(ch)] != 0) 233 || (CharOfD(ch) >= 128))))) { 234 ; 235 } else { 236 ch = CHREF(blank); 237 TR(TRACE_CHARPUT, ("forced to blank")); 238 } 239 chlen = 1; 240 } 241#endif 242 243 if ((AttrOf(attr) & A_ALTCHARSET) 244 && SP->_acs_map != 0 245 && CharOfD(ch) < ACS_LEN) { 246 my_ch = CHDEREF(ch); /* work around const param */ 247#if USE_WIDEC_SUPPORT 248 /* 249 * This is crude & ugly, but works most of the time. It checks if the 250 * acs_chars string specified that we have a mapping for this 251 * character, and uses the wide-character mapping when we expect the 252 * normal one to be broken (by mis-design ;-). 253 */ 254 if (SP->_screen_acs_fix 255 && SP->_screen_acs_map[CharOf(my_ch)]) { 256 RemAttr(attr, A_ALTCHARSET); 257 my_ch = _nc_wacs[CharOf(my_ch)]; 258 } 259#endif 260 /* 261 * If we (still) have alternate character set, it is the normal 8bit 262 * flavor. The _screen_acs_map[] array tells if the character was 263 * really in acs_chars, needed because of the way wide/normal line 264 * drawing flavors are integrated. 265 */ 266 if (AttrOf(attr) & A_ALTCHARSET) { 267 int j = CharOfD(ch); 268 chtype temp = UChar(SP->_acs_map[j]); 269 270 if (!(SP->_screen_acs_map[j])) { 271 RemAttr(attr, A_ALTCHARSET); 272 if (temp == 0) 273 temp = ' '; 274 } 275 if (temp != 0) 276 SetChar(my_ch, temp, AttrOf(attr)); 277 } 278 ch = CHREF(my_ch); 279 } 280 if (tilde_glitch && (CharOfD(ch) == L('~'))) { 281 SetChar(tilde, L('`'), AttrOf(attr)); 282 ch = CHREF(tilde); 283 } 284 285 UpdateAttrs(attr); 286#if !USE_WIDEC_SUPPORT 287 /* FIXME - we do this special case for signal handling, should see how to 288 * make it work for wide characters. 289 */ 290 if (SP->_outch != 0) { 291 SP->_outch(UChar(ch)); 292 } else 293#endif 294 { 295 PUTC(CHDEREF(ch), SP->_ofp); /* macro's fastest... */ 296 COUNT_OUTCHARS(1); 297 } 298 SP->_curscol += chlen; 299 if (char_padding) { 300 TPUTS_TRACE("char_padding"); 301 putp(char_padding); 302 } 303} 304 305static bool 306check_pending(void) 307/* check for pending input */ 308{ 309 bool have_pending = FALSE; 310 311 /* 312 * Only carry out this check when the flag is zero, otherwise we'll 313 * have the refreshing slow down drastically (or stop) if there's an 314 * unread character available. 315 */ 316 if (SP->_fifohold != 0) 317 return FALSE; 318 319 if (SP->_checkfd >= 0) { 320#if USE_FUNC_POLL 321 struct pollfd fds[1]; 322 fds[0].fd = SP->_checkfd; 323 fds[0].events = POLLIN; 324 if (poll(fds, 1, 0) > 0) { 325 have_pending = TRUE; 326 } 327#elif defined(__BEOS__) 328 /* 329 * BeOS's select() is declared in socket.h, so the configure script does 330 * not see it. That's just as well, since that function works only for 331 * sockets. This (using snooze and ioctl) was distilled from Be's patch 332 * for ncurses which uses a separate thread to simulate select(). 333 * 334 * FIXME: the return values from the ioctl aren't very clear if we get 335 * interrupted. 336 */ 337 int n = 0; 338 int howmany = ioctl(0, 'ichr', &n); 339 if (howmany >= 0 && n > 0) { 340 have_pending = TRUE; 341 } 342#elif HAVE_SELECT 343 fd_set fdset; 344 struct timeval ktimeout; 345 346 ktimeout.tv_sec = 347 ktimeout.tv_usec = 0; 348 349 FD_ZERO(&fdset); 350 FD_SET(SP->_checkfd, &fdset); 351 if (select(SP->_checkfd + 1, &fdset, NULL, NULL, &ktimeout) != 0) { 352 have_pending = TRUE; 353 } 354#endif 355 } 356 if (have_pending) { 357 SP->_fifohold = 5; 358 _nc_flush(); 359 } 360 return FALSE; 361} 362 363/* put char at lower right corner */ 364static void 365PutCharLR(const ARG_CH_T ch) 366{ 367 if (!auto_right_margin) { 368 /* we can put the char directly */ 369 PutAttrChar(ch); 370 } else if (enter_am_mode && exit_am_mode) { 371 /* we can suppress automargin */ 372 TPUTS_TRACE("exit_am_mode"); 373 putp(exit_am_mode); 374 375 PutAttrChar(ch); 376 SP->_curscol--; 377 position_check(SP->_cursrow, SP->_curscol, "exit_am_mode"); 378 379 TPUTS_TRACE("enter_am_mode"); 380 putp(enter_am_mode); 381 } else if ((enter_insert_mode && exit_insert_mode) 382 || insert_character || parm_ich) { 383 GoTo(screen_lines - 1, screen_columns - 2); 384 PutAttrChar(ch); 385 GoTo(screen_lines - 1, screen_columns - 2); 386 InsStr(newscr->_line[screen_lines - 1].text + screen_columns - 2, 1); 387 } 388} 389 390/* 391 * Wrap the cursor position, i.e., advance to the beginning of the next line. 392 */ 393static void 394wrap_cursor(void) 395{ 396 if (eat_newline_glitch) { 397 /* 398 * xenl can manifest two different ways. The vt100 way is that, when 399 * you'd expect the cursor to wrap, it stays hung at the right margin 400 * (on top of the character just emitted) and doesn't wrap until the 401 * *next* graphic char is emitted. The c100 way is to ignore LF 402 * received just after an am wrap. 403 * 404 * An aggressive way to handle this would be to emit CR/LF after the 405 * char and then assume the wrap is done, you're on the first position 406 * of the next line, and the terminal out of its weird state. Here 407 * it's safe to just tell the code that the cursor is in hyperspace and 408 * let the next mvcur() call straighten things out. 409 */ 410 SP->_curscol = -1; 411 SP->_cursrow = -1; 412 } else if (auto_right_margin) { 413 SP->_curscol = 0; 414 SP->_cursrow++; 415 /* 416 * We've actually moved - but may have to work around problems with 417 * video attributes not working. 418 */ 419 if (!move_standout_mode && AttrOf(SCREEN_ATTRS(SP))) { 420 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before wrapping", 421 (unsigned long) AttrOf(SCREEN_ATTRS(SP)), 422 _traceattr(AttrOf(SCREEN_ATTRS(SP))))); 423 (void) VIDATTR(A_NORMAL, 0); 424 } 425 } else { 426 SP->_curscol--; 427 } 428 position_check(SP->_cursrow, SP->_curscol, "wrap_cursor"); 429} 430 431static NCURSES_INLINE void 432PutChar(const ARG_CH_T ch) 433/* insert character, handling automargin stuff */ 434{ 435 if (SP->_cursrow == screen_lines - 1 && SP->_curscol == screen_columns - 1) 436 PutCharLR(ch); 437 else 438 PutAttrChar(ch); 439 440 if (SP->_curscol >= screen_columns) 441 wrap_cursor(); 442 443 position_check(SP->_cursrow, SP->_curscol, "PutChar"); 444} 445 446/* 447 * Check whether the given character can be output by clearing commands. This 448 * includes test for being a space and not including any 'bad' attributes, such 449 * as A_REVERSE. All attribute flags which don't affect appearance of a space 450 * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded. 451 */ 452static NCURSES_INLINE bool 453can_clear_with(ARG_CH_T ch) 454{ 455 if (!back_color_erase && SP->_coloron) { 456#if NCURSES_EXT_FUNCS 457 int pair; 458 459 if (!SP->_default_color) 460 return FALSE; 461 if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK) 462 return FALSE; 463 if ((pair = GetPair(CHDEREF(ch))) != 0) { 464 short fg, bg; 465 pair_content(pair, &fg, &bg); 466 if (fg != C_MASK || bg != C_MASK) 467 return FALSE; 468 } 469#else 470 if (AttrOfD(ch) & A_COLOR) 471 return FALSE; 472#endif 473 } 474 return (ISBLANK(CHDEREF(ch)) && 475 (AttrOfD(ch) & ~(NONBLANK_ATTR | A_COLOR)) == BLANK_ATTR); 476} 477 478/* 479 * Issue a given span of characters from an array. 480 * Must be functionally equivalent to: 481 * for (i = 0; i < num; i++) 482 * PutChar(ntext[i]); 483 * but can leave the cursor positioned at the middle of the interval. 484 * 485 * Returns: 0 - cursor is at the end of interval 486 * 1 - cursor is somewhere in the middle 487 * 488 * This code is optimized using ech and rep. 489 */ 490static int 491EmitRange(const NCURSES_CH_T * ntext, int num) 492{ 493 int i; 494 495 TR(TRACE_CHARPUT, ("EmitRange %d:%s", num, _nc_viscbuf(ntext, num))); 496 497 if (erase_chars || repeat_char) { 498 while (num > 0) { 499 int runcount; 500 NCURSES_CH_T ntext0; 501 502 while (num > 1 && !CharEq(ntext[0], ntext[1])) { 503 PutChar(CHREF(ntext[0])); 504 ntext++; 505 num--; 506 } 507 ntext0 = ntext[0]; 508 if (num == 1) { 509 PutChar(CHREF(ntext0)); 510 return 0; 511 } 512 runcount = 2; 513 514 while (runcount < num && CharEq(ntext[runcount], ntext0)) 515 runcount++; 516 517 /* 518 * The cost expression in the middle isn't exactly right. 519 * _cup_ch_cost is an upper bound on the cost for moving to the 520 * end of the erased area, but not the cost itself (which we 521 * can't compute without emitting the move). This may result 522 * in erase_chars not getting used in some situations for 523 * which it would be marginally advantageous. 524 */ 525 if (erase_chars 526 && runcount > SP->_ech_cost + SP->_cup_ch_cost 527 && can_clear_with(CHREF(ntext0))) { 528 UpdateAttrs(ntext0); 529 putp(TPARM_1(erase_chars, runcount)); 530 531 /* 532 * If this is the last part of the given interval, 533 * don't bother moving cursor, since it can be the 534 * last update on the line. 535 */ 536 if (runcount < num) { 537 GoTo(SP->_cursrow, SP->_curscol + runcount); 538 } else { 539 return 1; /* cursor stays in the middle */ 540 } 541 } else if (repeat_char && runcount > SP->_rep_cost) { 542 bool wrap_possible = (SP->_curscol + runcount >= screen_columns); 543 int rep_count = runcount; 544 545 if (wrap_possible) 546 rep_count--; 547 548 UpdateAttrs(ntext0); 549 tputs(TPARM_2(repeat_char, CharOf(ntext0), rep_count), 550 rep_count, _nc_outch); 551 SP->_curscol += rep_count; 552 553 if (wrap_possible) 554 PutChar(CHREF(ntext0)); 555 } else { 556 for (i = 0; i < runcount; i++) 557 PutChar(CHREF(ntext[i])); 558 } 559 ntext += runcount; 560 num -= runcount; 561 } 562 return 0; 563 } 564 565 for (i = 0; i < num; i++) 566 PutChar(CHREF(ntext[i])); 567 return 0; 568} 569 570/* 571 * Output the line in the given range [first .. last] 572 * 573 * If there's a run of identical characters that's long enough to justify 574 * cursor movement, use that also. 575 * 576 * Returns: same as EmitRange 577 */ 578static int 579PutRange(const NCURSES_CH_T * otext, 580 const NCURSES_CH_T * ntext, 581 int row, 582 int first, int last) 583{ 584 int i, j, same; 585 586 TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)", 587 otext, ntext, row, first, last)); 588 589 if (otext != ntext 590 && (last - first + 1) > SP->_inline_cost) { 591 for (j = first, same = 0; j <= last; j++) { 592 if (!same && isWidecExt(otext[j])) 593 continue; 594 if (CharEq(otext[j], ntext[j])) { 595 same++; 596 } else { 597 if (same > SP->_inline_cost) { 598 EmitRange(ntext + first, j - same - first); 599 GoTo(row, first = j); 600 } 601 same = 0; 602 } 603 } 604 i = EmitRange(ntext + first, j - same - first); 605 /* 606 * Always return 1 for the next GoTo() after a PutRange() if we found 607 * identical characters at end of interval 608 */ 609 return (same == 0 ? i : 1); 610 } 611 return EmitRange(ntext + first, last - first + 1); 612} 613 614/* leave unbracketed here so 'indent' works */ 615#define MARK_NOCHANGE(win,row) \ 616 win->_line[row].firstchar = _NOCHANGE; \ 617 win->_line[row].lastchar = _NOCHANGE; \ 618 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row) 619 620NCURSES_EXPORT(int) 621doupdate(void) 622{ 623 int i; 624 int nonempty; 625#if USE_TRACE_TIMES 626 struct tms before, after; 627#endif /* USE_TRACE_TIMES */ 628 629 T((T_CALLED("doupdate()"))); 630 631 if (curscr == 0 632 || newscr == 0) 633 returnCode(ERR); 634 635#ifdef TRACE 636 if (USE_TRACEF(TRACE_UPDATE)) { 637 if (curscr->_clear) 638 _tracef("curscr is clear"); 639 else 640 _tracedump("curscr", curscr); 641 _tracedump("newscr", newscr); 642 _nc_unlock_global(tracef); 643 } 644#endif /* TRACE */ 645 646 _nc_signal_handler(FALSE); 647 648 if (SP->_fifohold) 649 SP->_fifohold--; 650 651#if USE_SIZECHANGE 652 if (SP->_endwin || _nc_handle_sigwinch(SP)) { 653 /* 654 * This is a transparent extension: XSI does not address it, 655 * and applications need not know that ncurses can do it. 656 * 657 * Check if the terminal size has changed while curses was off 658 * (this can happen in an xterm, for example), and resize the 659 * ncurses data structures accordingly. 660 */ 661 _nc_update_screensize(SP); 662 } 663#endif 664 665 if (SP->_endwin) { 666 667 T(("coming back from shell mode")); 668 reset_prog_mode(); 669 670 _nc_mvcur_resume(); 671 _nc_screen_resume(); 672 SP->_mouse_resume(SP); 673 674 SP->_endwin = FALSE; 675 } 676#if USE_TRACE_TIMES 677 /* zero the metering machinery */ 678 RESET_OUTCHARS(); 679 (void) times(&before); 680#endif /* USE_TRACE_TIMES */ 681 682 /* 683 * This is the support for magic-cookie terminals. The theory: we scan 684 * the virtual screen looking for attribute turnons. Where we find one, 685 * check to make sure it's realizable by seeing if the required number of 686 * un-attributed blanks are present before and after the attributed range; 687 * try to shift the range boundaries over blanks (not changing the screen 688 * display) so this becomes true. If it is, shift the beginning attribute 689 * change appropriately (the end one, if we've gotten this far, is 690 * guaranteed room for its cookie). If not, nuke the added attributes out 691 * of the span. 692 */ 693#if USE_XMC_SUPPORT 694 if (magic_cookie_glitch > 0) { 695 int j, k; 696 attr_t rattr = A_NORMAL; 697 698 for (i = 0; i < screen_lines; i++) { 699 for (j = 0; j < screen_columns; j++) { 700 bool failed = FALSE; 701 NCURSES_CH_T *thisline = newscr->_line[i].text; 702 attr_t thisattr = AttrOf(thisline[j]) & SP->_xmc_triggers; 703 attr_t turnon = thisattr & ~rattr; 704 705 /* is an attribute turned on here? */ 706 if (turnon == 0) { 707 rattr = thisattr; 708 continue; 709 } 710 711 TR(TRACE_ATTRS, ("At (%d, %d): from %s...", i, j, _traceattr(rattr))); 712 TR(TRACE_ATTRS, ("...to %s", _traceattr(turnon))); 713 714 /* 715 * If the attribute change location is a blank with a "safe" 716 * attribute, undo the attribute turnon. This may ensure 717 * there's enough room to set the attribute before the first 718 * non-blank in the run. 719 */ 720#define SAFE(a) (!((a) & SP->_xmc_triggers)) 721 if (ISBLANK(thisline[j]) && SAFE(turnon)) { 722 RemAttr(thisline[j], turnon); 723 continue; 724 } 725 726 /* check that there's enough room at start of span */ 727 for (k = 1; k <= magic_cookie_glitch; k++) { 728 if (j - k < 0 729 || !ISBLANK(thisline[j - k]) 730 || !SAFE(AttrOf(thisline[j - k]))) { 731 failed = TRUE; 732 TR(TRACE_ATTRS, ("No room at start in %d,%d%s%s", 733 i, j - k, 734 (ISBLANK(thisline[j - k]) 735 ? "" 736 : ":nonblank"), 737 (SAFE(AttrOf(thisline[j - k])) 738 ? "" 739 : ":unsafe"))); 740 break; 741 } 742 } 743 if (!failed) { 744 bool end_onscreen = FALSE; 745 int m, n = j; 746 747 /* find end of span, if it's onscreen */ 748 for (m = i; m < screen_lines; m++) { 749 for (; n < screen_columns; n++) { 750 attr_t testattr = AttrOf(newscr->_line[m].text[n]); 751 if ((testattr & SP->_xmc_triggers) == rattr) { 752 end_onscreen = TRUE; 753 TR(TRACE_ATTRS, 754 ("Range attributed with %s ends at (%d, %d)", 755 _traceattr(turnon), m, n)); 756 goto foundit; 757 } 758 } 759 n = 0; 760 } 761 TR(TRACE_ATTRS, 762 ("Range attributed with %s ends offscreen", 763 _traceattr(turnon))); 764 foundit:; 765 766 if (end_onscreen) { 767 NCURSES_CH_T *lastline = newscr->_line[m].text; 768 769 /* 770 * If there are safely-attributed blanks at the end of 771 * the range, shorten the range. This will help ensure 772 * that there is enough room at end of span. 773 */ 774 while (n >= 0 775 && ISBLANK(lastline[n]) 776 && SAFE(AttrOf(lastline[n]))) { 777 RemAttr(lastline[n--], turnon); 778 } 779 780 /* check that there's enough room at end of span */ 781 for (k = 1; k <= magic_cookie_glitch; k++) { 782 if (n + k >= screen_columns 783 || !ISBLANK(lastline[n + k]) 784 || !SAFE(AttrOf(lastline[n + k]))) { 785 failed = TRUE; 786 TR(TRACE_ATTRS, 787 ("No room at end in %d,%d%s%s", 788 i, j - k, 789 (ISBLANK(lastline[n + k]) 790 ? "" 791 : ":nonblank"), 792 (SAFE(AttrOf(lastline[n + k])) 793 ? "" 794 : ":unsafe"))); 795 break; 796 } 797 } 798 } 799 } 800 801 if (failed) { 802 int p, q = j; 803 804 TR(TRACE_ATTRS, 805 ("Clearing %s beginning at (%d, %d)", 806 _traceattr(turnon), i, j)); 807 808 /* turn off new attributes over span */ 809 for (p = i; p < screen_lines; p++) { 810 for (; q < screen_columns; q++) { 811 attr_t testattr = AttrOf(newscr->_line[p].text[q]); 812 if ((testattr & SP->_xmc_triggers) == rattr) 813 goto foundend; 814 RemAttr(newscr->_line[p].text[q], turnon); 815 } 816 q = 0; 817 } 818 foundend:; 819 } else { 820 TR(TRACE_ATTRS, 821 ("Cookie space for %s found before (%d, %d)", 822 _traceattr(turnon), i, j)); 823 824 /* 825 * Back up the start of range so there's room for cookies 826 * before the first nonblank character. 827 */ 828 for (k = 1; k <= magic_cookie_glitch; k++) 829 AddAttr(thisline[j - k], turnon); 830 } 831 832 rattr = thisattr; 833 } 834 } 835 836#ifdef TRACE 837 /* show altered highlights after magic-cookie check */ 838 if (USE_TRACEF(TRACE_UPDATE)) { 839 _tracef("After magic-cookie check..."); 840 _tracedump("newscr", newscr); 841 _nc_unlock_global(tracef); 842 } 843#endif /* TRACE */ 844 } 845#endif /* USE_XMC_SUPPORT */ 846 847 nonempty = 0; 848 if (curscr->_clear || newscr->_clear) { /* force refresh ? */ 849 ClrUpdate(); 850 curscr->_clear = FALSE; /* reset flag */ 851 newscr->_clear = FALSE; /* reset flag */ 852 } else { 853 int changedlines = CHECK_INTERVAL; 854 855 if (check_pending()) 856 goto cleanup; 857 858 nonempty = min(screen_lines, newscr->_maxy + 1); 859 860 if (SP->_scrolling) { 861 _nc_scroll_optimize(); 862 } 863 864 nonempty = ClrBottom(nonempty); 865 866 TR(TRACE_UPDATE, ("Transforming lines, nonempty %d", nonempty)); 867 for (i = 0; i < nonempty; i++) { 868 /* 869 * Here is our line-breakout optimization. 870 */ 871 if (changedlines == CHECK_INTERVAL) { 872 if (check_pending()) 873 goto cleanup; 874 changedlines = 0; 875 } 876 877 /* 878 * newscr->line[i].firstchar is normally set 879 * by wnoutrefresh. curscr->line[i].firstchar 880 * is normally set by _nc_scroll_window in the 881 * vertical-movement optimization code, 882 */ 883 if (newscr->_line[i].firstchar != _NOCHANGE 884 || curscr->_line[i].firstchar != _NOCHANGE) { 885 TransformLine(i); 886 changedlines++; 887 } 888 889 /* mark line changed successfully */ 890 if (i <= newscr->_maxy) { 891 MARK_NOCHANGE(newscr, i); 892 } 893 if (i <= curscr->_maxy) { 894 MARK_NOCHANGE(curscr, i); 895 } 896 } 897 } 898 899 /* put everything back in sync */ 900 for (i = nonempty; i <= newscr->_maxy; i++) { 901 MARK_NOCHANGE(newscr, i); 902 } 903 for (i = nonempty; i <= curscr->_maxy; i++) { 904 MARK_NOCHANGE(curscr, i); 905 } 906 907 if (!newscr->_leaveok) { 908 curscr->_curx = newscr->_curx; 909 curscr->_cury = newscr->_cury; 910 911 GoTo(curscr->_cury, curscr->_curx); 912 } 913 914 cleanup: 915 /* 916 * We would like to keep the physical screen in normal mode in case we get 917 * other processes writing to the screen. This goal cannot be met for 918 * magic cookies since it interferes with attributes that may propagate 919 * past the current position. 920 */ 921#if USE_XMC_SUPPORT 922 if (magic_cookie_glitch != 0) 923#endif 924 UpdateAttrs(normal); 925 926 _nc_flush(); 927 WINDOW_ATTRS(curscr) = WINDOW_ATTRS(newscr); 928 929#if USE_TRACE_TIMES 930 (void) times(&after); 931 TR(TRACE_TIMES, 932 ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time", 933 _nc_outchars, 934 (long) (after.tms_stime - before.tms_stime), 935 (long) (after.tms_utime - before.tms_utime))); 936#endif /* USE_TRACE_TIMES */ 937 938 _nc_signal_handler(TRUE); 939 940 returnCode(OK); 941} 942 943/* 944 * ClrBlank(win) 945 * 946 * Returns the attributed character that corresponds to the "cleared" 947 * screen. If the terminal has the back-color-erase feature, this will be 948 * colored according to the wbkgd() call. 949 * 950 * We treat 'curscr' specially because it isn't supposed to be set directly 951 * in the wbkgd() call. Assume 'stdscr' for this case. 952 */ 953#define BCE_ATTRS (A_NORMAL|A_COLOR) 954#define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_nc_bkgd) 955 956static NCURSES_INLINE NCURSES_CH_T 957ClrBlank(WINDOW *win) 958{ 959 NCURSES_CH_T blank = blankchar; 960 if (back_color_erase) 961 AddAttr(blank, (AttrOf(BCE_BKGD(win)) & BCE_ATTRS)); 962 return blank; 963} 964 965/* 966** ClrUpdate() 967** 968** Update by clearing and redrawing the entire screen. 969** 970*/ 971 972static void 973ClrUpdate(void) 974{ 975 int i; 976 NCURSES_CH_T blank = ClrBlank(stdscr); 977 int nonempty = min(screen_lines, newscr->_maxy + 1); 978 979 TR(TRACE_UPDATE, (T_CALLED("ClrUpdate"))); 980 981 ClearScreen(blank); 982 983 TR(TRACE_UPDATE, ("updating screen from scratch")); 984 985 nonempty = ClrBottom(nonempty); 986 987 for (i = 0; i < nonempty; i++) 988 TransformLine(i); 989 990 TR(TRACE_UPDATE, (T_RETURN(""))); 991} 992 993/* 994** ClrToEOL(blank) 995** 996** Clear to end of current line, starting at the cursor position 997*/ 998 999static void 1000ClrToEOL(NCURSES_CH_T blank, bool needclear) 1001{ 1002 int j; 1003 1004 if (curscr != 0 1005 && SP->_cursrow >= 0) { 1006 for (j = SP->_curscol; j < screen_columns; j++) { 1007 if (j >= 0) { 1008 NCURSES_CH_T *cp = &(curscr->_line[SP->_cursrow].text[j]); 1009 1010 if (!CharEq(*cp, blank)) { 1011 *cp = blank; 1012 needclear = TRUE; 1013 } 1014 } 1015 } 1016 } else { 1017 needclear = TRUE; 1018 } 1019 1020 if (needclear) { 1021 UpdateAttrs(blank); 1022 TPUTS_TRACE("clr_eol"); 1023 if (clr_eol && SP->_el_cost <= (screen_columns - SP->_curscol)) { 1024 putp(clr_eol); 1025 } else { 1026 int count = (screen_columns - SP->_curscol); 1027 while (count-- > 0) 1028 PutChar(CHREF(blank)); 1029 } 1030 } 1031} 1032 1033/* 1034** ClrToEOS(blank) 1035** 1036** Clear to end of screen, starting at the cursor position 1037*/ 1038 1039static void 1040ClrToEOS(NCURSES_CH_T blank) 1041{ 1042 int row, col; 1043 1044 row = SP->_cursrow; 1045 col = SP->_curscol; 1046 1047 UpdateAttrs(blank); 1048 TPUTS_TRACE("clr_eos"); 1049 tputs(clr_eos, screen_lines - row, _nc_outch); 1050 1051 while (col < screen_columns) 1052 curscr->_line[row].text[col++] = blank; 1053 1054 for (row++; row < screen_lines; row++) { 1055 for (col = 0; col < screen_columns; col++) 1056 curscr->_line[row].text[col] = blank; 1057 } 1058} 1059 1060/* 1061 * ClrBottom(total) 1062 * 1063 * Test if clearing the end of the screen would satisfy part of the 1064 * screen-update. Do this by scanning backwards through the lines in the 1065 * screen, checking if each is blank, and one or more are changed. 1066 */ 1067static int 1068ClrBottom(int total) 1069{ 1070 int row; 1071 int col; 1072 int top = total; 1073 int last = min(screen_columns, newscr->_maxx + 1); 1074 NCURSES_CH_T blank = newscr->_line[total - 1].text[last - 1]; 1075 bool ok; 1076 1077 if (clr_eos && can_clear_with(CHREF(blank))) { 1078 1079 for (row = total - 1; row >= 0; row--) { 1080 for (col = 0, ok = TRUE; ok && col < last; col++) { 1081 ok = (CharEq(newscr->_line[row].text[col], blank)); 1082 } 1083 if (!ok) 1084 break; 1085 1086 for (col = 0; ok && col < last; col++) { 1087 ok = (CharEq(curscr->_line[row].text[col], blank)); 1088 } 1089 if (!ok) 1090 top = row; 1091 } 1092 1093 /* don't use clr_eos for just one line if clr_eol available */ 1094 if (top < total) { 1095 GoTo(top, 0); 1096 ClrToEOS(blank); 1097 if (SP->oldhash && SP->newhash) { 1098 for (row = top; row < screen_lines; row++) 1099 SP->oldhash[row] = SP->newhash[row]; 1100 } 1101 } 1102 } 1103 return top; 1104} 1105 1106#if USE_XMC_SUPPORT 1107#if USE_WIDEC_SUPPORT 1108#define check_xmc_transition(a, b) \ 1109 ((((a)->attr ^ (b)->attr) & ~((a)->attr) & SP->_xmc_triggers) != 0) 1110#define xmc_turn_on(a,b) check_xmc_transition(&(a), &(b)) 1111#else 1112#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0) 1113#endif 1114 1115#define xmc_new(r,c) newscr->_line[r].text[c] 1116#define xmc_turn_off(a,b) xmc_turn_on(b,a) 1117#endif /* USE_XMC_SUPPORT */ 1118 1119/* 1120** TransformLine(lineno) 1121** 1122** Transform the given line in curscr to the one in newscr, using 1123** Insert/Delete Character if _nc_idcok && has_ic(). 1124** 1125** firstChar = position of first different character in line 1126** oLastChar = position of last different character in old line 1127** nLastChar = position of last different character in new line 1128** 1129** move to firstChar 1130** overwrite chars up to min(oLastChar, nLastChar) 1131** if oLastChar < nLastChar 1132** insert newLine[oLastChar+1..nLastChar] 1133** else 1134** delete oLastChar - nLastChar spaces 1135*/ 1136 1137static void 1138TransformLine(int const lineno) 1139{ 1140 int firstChar, oLastChar, nLastChar; 1141 NCURSES_CH_T *newLine = newscr->_line[lineno].text; 1142 NCURSES_CH_T *oldLine = curscr->_line[lineno].text; 1143 int n; 1144 bool attrchanged = FALSE; 1145 1146 TR(TRACE_UPDATE, (T_CALLED("TransformLine(%d)"), lineno)); 1147 1148 /* copy new hash value to old one */ 1149 if (SP->oldhash && SP->newhash) 1150 SP->oldhash[lineno] = SP->newhash[lineno]; 1151 1152 /* 1153 * If we have colors, there is the possibility of having two color pairs 1154 * that display as the same colors. For instance, Lynx does this. Check 1155 * for this case, and update the old line with the new line's colors when 1156 * they are equivalent. 1157 */ 1158 if (SP->_coloron) { 1159 int oldPair; 1160 int newPair; 1161 1162 for (n = 0; n < screen_columns; n++) { 1163 if (!CharEq(newLine[n], oldLine[n])) { 1164 oldPair = GetPair(oldLine[n]); 1165 newPair = GetPair(newLine[n]); 1166 if (oldPair != newPair 1167 && unColor(oldLine[n]) == unColor(newLine[n])) { 1168 if (oldPair < COLOR_PAIRS 1169 && newPair < COLOR_PAIRS 1170 && SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) { 1171 SetPair(oldLine[n], GetPair(newLine[n])); 1172 } 1173 } 1174 } 1175 } 1176 } 1177 1178 if (ceol_standout_glitch && clr_eol) { 1179 firstChar = 0; 1180 while (firstChar < screen_columns) { 1181 if (!SameAttrOf(newLine[firstChar], oldLine[firstChar])) { 1182 attrchanged = TRUE; 1183 break; 1184 } 1185 firstChar++; 1186 } 1187 } 1188 1189 firstChar = 0; 1190 1191 if (attrchanged) { /* we may have to disregard the whole line */ 1192 GoTo(lineno, firstChar); 1193 ClrToEOL(ClrBlank(curscr), FALSE); 1194 PutRange(oldLine, newLine, lineno, 0, (screen_columns - 1)); 1195#if USE_XMC_SUPPORT 1196 1197 /* 1198 * This is a very simple loop to paint characters which may have the 1199 * magic cookie glitch embedded. It doesn't know much about video 1200 * attributes which are continued from one line to the next. It 1201 * assumes that we have filtered out requests for attribute changes 1202 * that do not get mapped to blank positions. 1203 * 1204 * FIXME: we are not keeping track of where we put the cookies, so this 1205 * will work properly only once, since we may overwrite a cookie in a 1206 * following operation. 1207 */ 1208 } else if (magic_cookie_glitch > 0) { 1209 GoTo(lineno, firstChar); 1210 for (n = 0; n < screen_columns; n++) { 1211 int m = n + magic_cookie_glitch; 1212 1213 /* check for turn-on: 1214 * If we are writing an attributed blank, where the 1215 * previous cell is not attributed. 1216 */ 1217 if (ISBLANK(newLine[n]) 1218 && ((n > 0 1219 && xmc_turn_on(newLine[n - 1], newLine[n])) 1220 || (n == 0 1221 && lineno > 0 1222 && xmc_turn_on(xmc_new(lineno - 1, screen_columns - 1), 1223 newLine[n])))) { 1224 n = m; 1225 } 1226 1227 PutChar(CHREF(newLine[n])); 1228 1229 /* check for turn-off: 1230 * If we are writing an attributed non-blank, where the 1231 * next cell is blank, and not attributed. 1232 */ 1233 if (!ISBLANK(newLine[n]) 1234 && ((n + 1 < screen_columns 1235 && xmc_turn_off(newLine[n], newLine[n + 1])) 1236 || (n + 1 >= screen_columns 1237 && lineno + 1 < screen_lines 1238 && xmc_turn_off(newLine[n], xmc_new(lineno + 1, 0))))) { 1239 n = m; 1240 } 1241 1242 } 1243#endif 1244 } else { 1245 NCURSES_CH_T blank; 1246 1247 /* it may be cheap to clear leading whitespace with clr_bol */ 1248 blank = newLine[0]; 1249 if (clr_bol && can_clear_with(CHREF(blank))) { 1250 int oFirstChar, nFirstChar; 1251 1252 for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++) 1253 if (!CharEq(oldLine[oFirstChar], blank)) 1254 break; 1255 for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++) 1256 if (!CharEq(newLine[nFirstChar], blank)) 1257 break; 1258 1259 if (nFirstChar == oFirstChar) { 1260 firstChar = nFirstChar; 1261 /* find the first differing character */ 1262 while (firstChar < screen_columns 1263 && CharEq(newLine[firstChar], oldLine[firstChar])) 1264 firstChar++; 1265 } else if (oFirstChar > nFirstChar) { 1266 firstChar = nFirstChar; 1267 } else { /* oFirstChar < nFirstChar */ 1268 firstChar = oFirstChar; 1269 if (SP->_el1_cost < nFirstChar - oFirstChar) { 1270 if (nFirstChar >= screen_columns 1271 && SP->_el_cost <= SP->_el1_cost) { 1272 GoTo(lineno, 0); 1273 UpdateAttrs(blank); 1274 TPUTS_TRACE("clr_eol"); 1275 putp(clr_eol); 1276 } else { 1277 GoTo(lineno, nFirstChar - 1); 1278 UpdateAttrs(blank); 1279 TPUTS_TRACE("clr_bol"); 1280 putp(clr_bol); 1281 } 1282 1283 while (firstChar < nFirstChar) 1284 oldLine[firstChar++] = blank; 1285 } 1286 } 1287 } else { 1288 /* find the first differing character */ 1289 while (firstChar < screen_columns 1290 && CharEq(newLine[firstChar], oldLine[firstChar])) 1291 firstChar++; 1292 } 1293 /* if there wasn't one, we're done */ 1294 if (firstChar >= screen_columns) { 1295 TR(TRACE_UPDATE, (T_RETURN(""))); 1296 return; 1297 } 1298 1299 blank = newLine[screen_columns - 1]; 1300 1301 if (!can_clear_with(CHREF(blank))) { 1302 /* find the last differing character */ 1303 nLastChar = screen_columns - 1; 1304 1305 while (nLastChar > firstChar 1306 && CharEq(newLine[nLastChar], oldLine[nLastChar])) 1307 nLastChar--; 1308 1309 if (nLastChar >= firstChar) { 1310 GoTo(lineno, firstChar); 1311 PutRange(oldLine, newLine, lineno, firstChar, nLastChar); 1312 memcpy(oldLine + firstChar, 1313 newLine + firstChar, 1314 (nLastChar - firstChar + 1) * sizeof(NCURSES_CH_T)); 1315 } 1316 TR(TRACE_UPDATE, (T_RETURN(""))); 1317 return; 1318 } 1319 1320 /* find last non-blank character on old line */ 1321 oLastChar = screen_columns - 1; 1322 while (oLastChar > firstChar && CharEq(oldLine[oLastChar], blank)) 1323 oLastChar--; 1324 1325 /* find last non-blank character on new line */ 1326 nLastChar = screen_columns - 1; 1327 while (nLastChar > firstChar && CharEq(newLine[nLastChar], blank)) 1328 nLastChar--; 1329 1330 if ((nLastChar == firstChar) 1331 && (SP->_el_cost < (oLastChar - nLastChar))) { 1332 GoTo(lineno, firstChar); 1333 if (!CharEq(newLine[firstChar], blank)) 1334 PutChar(CHREF(newLine[firstChar])); 1335 ClrToEOL(blank, FALSE); 1336 } else if ((nLastChar != oLastChar) 1337 && (!CharEq(newLine[nLastChar], oldLine[oLastChar]) 1338 || !(_nc_idcok && has_ic()))) { 1339 GoTo(lineno, firstChar); 1340 if ((oLastChar - nLastChar) > SP->_el_cost) { 1341 if (PutRange(oldLine, newLine, lineno, firstChar, nLastChar)) 1342 GoTo(lineno, nLastChar + 1); 1343 ClrToEOL(blank, FALSE); 1344 } else { 1345 n = max(nLastChar, oLastChar); 1346 PutRange(oldLine, newLine, lineno, firstChar, n); 1347 } 1348 } else { 1349 int nLastNonblank = nLastChar; 1350 int oLastNonblank = oLastChar; 1351 1352 /* find the last characters that really differ */ 1353 /* can be -1 if no characters differ */ 1354 while (CharEq(newLine[nLastChar], oldLine[oLastChar])) { 1355 /* don't split a wide char */ 1356 if (isWidecExt(newLine[nLastChar]) && 1357 !CharEq(newLine[nLastChar - 1], oldLine[oLastChar - 1])) 1358 break; 1359 nLastChar--; 1360 oLastChar--; 1361 if (nLastChar == -1 || oLastChar == -1) 1362 break; 1363 } 1364 1365 n = min(oLastChar, nLastChar); 1366 if (n >= firstChar) { 1367 GoTo(lineno, firstChar); 1368 PutRange(oldLine, newLine, lineno, firstChar, n); 1369 } 1370 1371 if (oLastChar < nLastChar) { 1372 int m = max(nLastNonblank, oLastNonblank); 1373#if USE_WIDEC_SUPPORT 1374 while (isWidecExt(newLine[n + 1]) && n) { 1375 --n; 1376 --oLastChar; 1377 } 1378#endif 1379 GoTo(lineno, n + 1); 1380 if ((nLastChar < nLastNonblank) 1381 || InsCharCost(nLastChar - oLastChar) > (m - n)) { 1382 PutRange(oldLine, newLine, lineno, n + 1, m); 1383 } else { 1384 InsStr(&newLine[n + 1], nLastChar - oLastChar); 1385 } 1386 } else if (oLastChar > nLastChar) { 1387 GoTo(lineno, n + 1); 1388 if (DelCharCost(oLastChar - nLastChar) 1389 > SP->_el_cost + nLastNonblank - (n + 1)) { 1390 if (PutRange(oldLine, newLine, lineno, 1391 n + 1, nLastNonblank)) 1392 GoTo(lineno, nLastNonblank + 1); 1393 ClrToEOL(blank, FALSE); 1394 } else { 1395 /* 1396 * The delete-char sequence will 1397 * effectively shift in blanks from the 1398 * right margin of the screen. Ensure 1399 * that they are the right color by 1400 * setting the video attributes from 1401 * the last character on the row. 1402 */ 1403 UpdateAttrs(blank); 1404 DelChar(oLastChar - nLastChar); 1405 } 1406 } 1407 } 1408 } 1409 1410 /* update the code's internal representation */ 1411 if (screen_columns > firstChar) 1412 memcpy(oldLine + firstChar, 1413 newLine + firstChar, 1414 (screen_columns - firstChar) * sizeof(NCURSES_CH_T)); 1415 TR(TRACE_UPDATE, (T_RETURN(""))); 1416 return; 1417} 1418 1419/* 1420** ClearScreen(blank) 1421** 1422** Clear the physical screen and put cursor at home 1423** 1424*/ 1425 1426static void 1427ClearScreen(NCURSES_CH_T blank) 1428{ 1429 int i, j; 1430 bool fast_clear = (clear_screen || clr_eos || clr_eol); 1431 1432 TR(TRACE_UPDATE, ("ClearScreen() called")); 1433 1434#if NCURSES_EXT_FUNCS 1435 if (SP->_coloron 1436 && !SP->_default_color) { 1437 _nc_do_color(GET_SCREEN_PAIR(SP), 0, FALSE, _nc_outch); 1438 if (!back_color_erase) { 1439 fast_clear = FALSE; 1440 } 1441 } 1442#endif 1443 1444 if (fast_clear) { 1445 if (clear_screen) { 1446 UpdateAttrs(blank); 1447 TPUTS_TRACE("clear_screen"); 1448 putp(clear_screen); 1449 SP->_cursrow = SP->_curscol = 0; 1450 position_check(SP->_cursrow, SP->_curscol, "ClearScreen"); 1451 } else if (clr_eos) { 1452 SP->_cursrow = SP->_curscol = -1; 1453 GoTo(0, 0); 1454 1455 UpdateAttrs(blank); 1456 TPUTS_TRACE("clr_eos"); 1457 tputs(clr_eos, screen_lines, _nc_outch); 1458 } else if (clr_eol) { 1459 SP->_cursrow = SP->_curscol = -1; 1460 1461 UpdateAttrs(blank); 1462 for (i = 0; i < screen_lines; i++) { 1463 GoTo(i, 0); 1464 TPUTS_TRACE("clr_eol"); 1465 putp(clr_eol); 1466 } 1467 GoTo(0, 0); 1468 } 1469 } else { 1470 UpdateAttrs(blank); 1471 for (i = 0; i < screen_lines; i++) { 1472 GoTo(i, 0); 1473 for (j = 0; j < screen_columns; j++) 1474 PutChar(CHREF(blank)); 1475 } 1476 GoTo(0, 0); 1477 } 1478 1479 for (i = 0; i < screen_lines; i++) { 1480 for (j = 0; j < screen_columns; j++) 1481 curscr->_line[i].text[j] = blank; 1482 } 1483 1484 TR(TRACE_UPDATE, ("screen cleared")); 1485} 1486 1487/* 1488** InsStr(line, count) 1489** 1490** Insert the count characters pointed to by line. 1491** 1492*/ 1493 1494static void 1495InsStr(NCURSES_CH_T * line, int count) 1496{ 1497 TR(TRACE_UPDATE, ("InsStr(%p,%d) called", line, count)); 1498 1499 /* Prefer parm_ich as it has the smallest cost - no need to shift 1500 * the whole line on each character. */ 1501 /* The order must match that of InsCharCost. */ 1502 if (parm_ich) { 1503 TPUTS_TRACE("parm_ich"); 1504 tputs(TPARM_1(parm_ich, count), count, _nc_outch); 1505 while (count) { 1506 PutAttrChar(CHREF(*line)); 1507 line++; 1508 count--; 1509 } 1510 } else if (enter_insert_mode && exit_insert_mode) { 1511 TPUTS_TRACE("enter_insert_mode"); 1512 putp(enter_insert_mode); 1513 while (count) { 1514 PutAttrChar(CHREF(*line)); 1515 if (insert_padding) { 1516 TPUTS_TRACE("insert_padding"); 1517 putp(insert_padding); 1518 } 1519 line++; 1520 count--; 1521 } 1522 TPUTS_TRACE("exit_insert_mode"); 1523 putp(exit_insert_mode); 1524 } else { 1525 while (count) { 1526 TPUTS_TRACE("insert_character"); 1527 putp(insert_character); 1528 PutAttrChar(CHREF(*line)); 1529 if (insert_padding) { 1530 TPUTS_TRACE("insert_padding"); 1531 putp(insert_padding); 1532 } 1533 line++; 1534 count--; 1535 } 1536 } 1537 position_check(SP->_cursrow, SP->_curscol, "InsStr"); 1538} 1539 1540/* 1541** DelChar(count) 1542** 1543** Delete count characters at current position 1544** 1545*/ 1546 1547static void 1548DelChar(int count) 1549{ 1550 int n; 1551 1552 TR(TRACE_UPDATE, ("DelChar(%d) called, position = (%ld,%ld)", 1553 count, 1554 (long) newscr->_cury, 1555 (long) newscr->_curx)); 1556 1557 if (parm_dch) { 1558 TPUTS_TRACE("parm_dch"); 1559 tputs(TPARM_1(parm_dch, count), count, _nc_outch); 1560 } else { 1561 for (n = 0; n < count; n++) { 1562 TPUTS_TRACE("delete_character"); 1563 putp(delete_character); 1564 } 1565 } 1566} 1567 1568/* 1569 * Physical-scrolling support 1570 * 1571 * This code was adapted from Keith Bostic's hardware scrolling 1572 * support for 4.4BSD curses. I (esr) translated it to use terminfo 1573 * capabilities, narrowed the call interface slightly, and cleaned 1574 * up some convoluted tests. I also added support for the memory_above 1575 * memory_below, and non_dest_scroll_region capabilities. 1576 * 1577 * For this code to work, we must have either 1578 * change_scroll_region and scroll forward/reverse commands, or 1579 * insert and delete line capabilities. 1580 * When the scrolling region has been set, the cursor has to 1581 * be at the last line of the region to make the scroll up 1582 * happen, or on the first line of region to scroll down. 1583 * 1584 * This code makes one aesthetic decision in the opposite way from 1585 * BSD curses. BSD curses preferred pairs of il/dl operations 1586 * over scrolls, allegedly because il/dl looked faster. We, on 1587 * the other hand, prefer scrolls because (a) they're just as fast 1588 * on many terminals and (b) using them avoids bouncing an 1589 * unchanged bottom section of the screen up and down, which is 1590 * visually nasty. 1591 * 1592 * (lav): added more cases, used dl/il when bot==maxy and in csr case. 1593 * 1594 * I used assumption that capabilities il/il1/dl/dl1 work inside 1595 * changed scroll region not shifting screen contents outside of it. 1596 * If there are any terminals behaving different way, it would be 1597 * necessary to add some conditions to scroll_csr_forward/backward. 1598 */ 1599 1600/* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */ 1601static int 1602scroll_csr_forward(int n, int top, int bot, int miny, int maxy, NCURSES_CH_T blank) 1603{ 1604 int i; 1605 1606 if (n == 1 && scroll_forward && top == miny && bot == maxy) { 1607 GoTo(bot, 0); 1608 UpdateAttrs(blank); 1609 TPUTS_TRACE("scroll_forward"); 1610 putp(scroll_forward); 1611 } else if (n == 1 && delete_line && bot == maxy) { 1612 GoTo(top, 0); 1613 UpdateAttrs(blank); 1614 TPUTS_TRACE("delete_line"); 1615 putp(delete_line); 1616 } else if (parm_index && top == miny && bot == maxy) { 1617 GoTo(bot, 0); 1618 UpdateAttrs(blank); 1619 TPUTS_TRACE("parm_index"); 1620 tputs(TPARM_2(parm_index, n, 0), n, _nc_outch); 1621 } else if (parm_delete_line && bot == maxy) { 1622 GoTo(top, 0); 1623 UpdateAttrs(blank); 1624 TPUTS_TRACE("parm_delete_line"); 1625 tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch); 1626 } else if (scroll_forward && top == miny && bot == maxy) { 1627 GoTo(bot, 0); 1628 UpdateAttrs(blank); 1629 for (i = 0; i < n; i++) { 1630 TPUTS_TRACE("scroll_forward"); 1631 putp(scroll_forward); 1632 } 1633 } else if (delete_line && bot == maxy) { 1634 GoTo(top, 0); 1635 UpdateAttrs(blank); 1636 for (i = 0; i < n; i++) { 1637 TPUTS_TRACE("delete_line"); 1638 putp(delete_line); 1639 } 1640 } else 1641 return ERR; 1642 1643#if NCURSES_EXT_FUNCS 1644 if (FILL_BCE()) { 1645 int j; 1646 for (i = 0; i < n; i++) { 1647 GoTo(bot - i, 0); 1648 for (j = 0; j < screen_columns; j++) 1649 PutChar(CHREF(blank)); 1650 } 1651 } 1652#endif 1653 return OK; 1654} 1655 1656/* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */ 1657/* n > 0 */ 1658static int 1659scroll_csr_backward(int n, int top, int bot, int miny, int maxy, 1660 NCURSES_CH_T blank) 1661{ 1662 int i; 1663 1664 if (n == 1 && scroll_reverse && top == miny && bot == maxy) { 1665 GoTo(top, 0); 1666 UpdateAttrs(blank); 1667 TPUTS_TRACE("scroll_reverse"); 1668 putp(scroll_reverse); 1669 } else if (n == 1 && insert_line && bot == maxy) { 1670 GoTo(top, 0); 1671 UpdateAttrs(blank); 1672 TPUTS_TRACE("insert_line"); 1673 putp(insert_line); 1674 } else if (parm_rindex && top == miny && bot == maxy) { 1675 GoTo(top, 0); 1676 UpdateAttrs(blank); 1677 TPUTS_TRACE("parm_rindex"); 1678 tputs(TPARM_2(parm_rindex, n, 0), n, _nc_outch); 1679 } else if (parm_insert_line && bot == maxy) { 1680 GoTo(top, 0); 1681 UpdateAttrs(blank); 1682 TPUTS_TRACE("parm_insert_line"); 1683 tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch); 1684 } else if (scroll_reverse && top == miny && bot == maxy) { 1685 GoTo(top, 0); 1686 UpdateAttrs(blank); 1687 for (i = 0; i < n; i++) { 1688 TPUTS_TRACE("scroll_reverse"); 1689 putp(scroll_reverse); 1690 } 1691 } else if (insert_line && bot == maxy) { 1692 GoTo(top, 0); 1693 UpdateAttrs(blank); 1694 for (i = 0; i < n; i++) { 1695 TPUTS_TRACE("insert_line"); 1696 putp(insert_line); 1697 } 1698 } else 1699 return ERR; 1700 1701#if NCURSES_EXT_FUNCS 1702 if (FILL_BCE()) { 1703 int j; 1704 for (i = 0; i < n; i++) { 1705 GoTo(top + i, 0); 1706 for (j = 0; j < screen_columns; j++) 1707 PutChar(CHREF(blank)); 1708 } 1709 } 1710#endif 1711 return OK; 1712} 1713 1714/* scroll by using delete_line at del and insert_line at ins */ 1715/* n > 0 */ 1716static int 1717scroll_idl(int n, int del, int ins, NCURSES_CH_T blank) 1718{ 1719 int i; 1720 1721 if (!((parm_delete_line || delete_line) && (parm_insert_line || insert_line))) 1722 return ERR; 1723 1724 GoTo(del, 0); 1725 UpdateAttrs(blank); 1726 if (n == 1 && delete_line) { 1727 TPUTS_TRACE("delete_line"); 1728 putp(delete_line); 1729 } else if (parm_delete_line) { 1730 TPUTS_TRACE("parm_delete_line"); 1731 tputs(TPARM_2(parm_delete_line, n, 0), n, _nc_outch); 1732 } else { /* if (delete_line) */ 1733 for (i = 0; i < n; i++) { 1734 TPUTS_TRACE("delete_line"); 1735 putp(delete_line); 1736 } 1737 } 1738 1739 GoTo(ins, 0); 1740 UpdateAttrs(blank); 1741 if (n == 1 && insert_line) { 1742 TPUTS_TRACE("insert_line"); 1743 putp(insert_line); 1744 } else if (parm_insert_line) { 1745 TPUTS_TRACE("parm_insert_line"); 1746 tputs(TPARM_2(parm_insert_line, n, 0), n, _nc_outch); 1747 } else { /* if (insert_line) */ 1748 for (i = 0; i < n; i++) { 1749 TPUTS_TRACE("insert_line"); 1750 putp(insert_line); 1751 } 1752 } 1753 1754 return OK; 1755} 1756 1757/* 1758 * Note: some terminals require the cursor to be within the scrolling margins 1759 * before setting them. Generally, the cursor must be at the appropriate end 1760 * of the scrolling margins when issuing an indexing operation (it is not 1761 * apparent whether it must also be at the left margin; we do this just to be 1762 * safe). To make the related cursor movement a little faster, we use the 1763 * save/restore cursor capabilities if the terminal has them. 1764 */ 1765NCURSES_EXPORT(int) 1766_nc_scrolln(int n, int top, int bot, int maxy) 1767/* scroll region from top to bot by n lines */ 1768{ 1769 NCURSES_CH_T blank = ClrBlank(stdscr); 1770 int i; 1771 bool cursor_saved = FALSE; 1772 int res; 1773 1774 TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy)); 1775 1776#if USE_XMC_SUPPORT 1777 /* 1778 * If we scroll, we might remove a cookie. 1779 */ 1780 if (magic_cookie_glitch > 0) { 1781 return (ERR); 1782 } 1783#endif 1784 1785 if (n > 0) { /* scroll up (forward) */ 1786 /* 1787 * Explicitly clear if stuff pushed off top of region might 1788 * be saved by the terminal. 1789 */ 1790 res = scroll_csr_forward(n, top, bot, 0, maxy, blank); 1791 1792 if (res == ERR && change_scroll_region) { 1793 if ((((n == 1 && scroll_forward) || parm_index) 1794 && (SP->_cursrow == bot || SP->_cursrow == bot - 1)) 1795 && save_cursor && restore_cursor) { 1796 cursor_saved = TRUE; 1797 TPUTS_TRACE("save_cursor"); 1798 putp(save_cursor); 1799 } 1800 TPUTS_TRACE("change_scroll_region"); 1801 putp(TPARM_2(change_scroll_region, top, bot)); 1802 if (cursor_saved) { 1803 TPUTS_TRACE("restore_cursor"); 1804 putp(restore_cursor); 1805 } else { 1806 SP->_cursrow = SP->_curscol = -1; 1807 } 1808 1809 res = scroll_csr_forward(n, top, bot, top, bot, blank); 1810 1811 TPUTS_TRACE("change_scroll_region"); 1812 putp(TPARM_2(change_scroll_region, 0, maxy)); 1813 SP->_cursrow = SP->_curscol = -1; 1814 } 1815 1816 if (res == ERR && _nc_idlok) 1817 res = scroll_idl(n, top, bot - n + 1, blank); 1818 1819 /* 1820 * Clear the newly shifted-in text. 1821 */ 1822 if (res != ERR 1823 && (non_dest_scroll_region || (memory_below && bot == maxy))) { 1824 static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT); 1825 if (bot == maxy && clr_eos) { 1826 GoTo(bot - n + 1, 0); 1827 ClrToEOS(blank2); 1828 } else { 1829 for (i = 0; i < n; i++) { 1830 GoTo(bot - i, 0); 1831 ClrToEOL(blank2, FALSE); 1832 } 1833 } 1834 } 1835 1836 } else { /* (n < 0) - scroll down (backward) */ 1837 res = scroll_csr_backward(-n, top, bot, 0, maxy, blank); 1838 1839 if (res == ERR && change_scroll_region) { 1840 if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top - 1) 1841 && save_cursor && restore_cursor) { 1842 cursor_saved = TRUE; 1843 TPUTS_TRACE("save_cursor"); 1844 putp(save_cursor); 1845 } 1846 TPUTS_TRACE("change_scroll_region"); 1847 putp(TPARM_2(change_scroll_region, top, bot)); 1848 if (cursor_saved) { 1849 TPUTS_TRACE("restore_cursor"); 1850 putp(restore_cursor); 1851 } else { 1852 SP->_cursrow = SP->_curscol = -1; 1853 } 1854 1855 res = scroll_csr_backward(-n, top, bot, top, bot, blank); 1856 1857 TPUTS_TRACE("change_scroll_region"); 1858 putp(TPARM_2(change_scroll_region, 0, maxy)); 1859 SP->_cursrow = SP->_curscol = -1; 1860 } 1861 1862 if (res == ERR && _nc_idlok) 1863 res = scroll_idl(-n, bot + n + 1, top, blank); 1864 1865 /* 1866 * Clear the newly shifted-in text. 1867 */ 1868 if (res != ERR 1869 && (non_dest_scroll_region || (memory_above && top == 0))) { 1870 static const NCURSES_CH_T blank2 = NewChar(BLANK_TEXT); 1871 for (i = 0; i < -n; i++) { 1872 GoTo(i + top, 0); 1873 ClrToEOL(blank2, FALSE); 1874 } 1875 } 1876 } 1877 1878 if (res == ERR) 1879 return (ERR); 1880 1881 _nc_scroll_window(curscr, n, top, bot, blank); 1882 1883 /* shift hash values too - they can be reused */ 1884 _nc_scroll_oldhash(n, top, bot); 1885 1886 return (OK); 1887} 1888 1889NCURSES_EXPORT(void) 1890_nc_screen_resume(void) 1891{ 1892 /* make sure terminal is in a sane known state */ 1893 SetAttr(SCREEN_ATTRS(SP), A_NORMAL); 1894 newscr->_clear = TRUE; 1895 1896 /* reset color pairs and definitions */ 1897 if (SP->_coloron || SP->_color_defs) 1898 _nc_reset_colors(); 1899 1900 /* restore user-defined colors, if any */ 1901 if (SP->_color_defs < 0) { 1902 int n; 1903 SP->_color_defs = -(SP->_color_defs); 1904 for (n = 0; n < SP->_color_defs; ++n) { 1905 if (SP->_color_table[n].init) { 1906 init_color(n, 1907 SP->_color_table[n].r, 1908 SP->_color_table[n].g, 1909 SP->_color_table[n].b); 1910 } 1911 } 1912 } 1913 1914 if (exit_attribute_mode) 1915 putp(exit_attribute_mode); 1916 else { 1917 /* turn off attributes */ 1918 if (exit_alt_charset_mode) 1919 putp(exit_alt_charset_mode); 1920 if (exit_standout_mode) 1921 putp(exit_standout_mode); 1922 if (exit_underline_mode) 1923 putp(exit_underline_mode); 1924 } 1925 if (exit_insert_mode) 1926 putp(exit_insert_mode); 1927 if (enter_am_mode && exit_am_mode) 1928 putp(auto_right_margin ? enter_am_mode : exit_am_mode); 1929} 1930 1931NCURSES_EXPORT(void) 1932_nc_screen_init(void) 1933{ 1934 _nc_screen_resume(); 1935} 1936 1937/* wrap up screen handling */ 1938NCURSES_EXPORT(void) 1939_nc_screen_wrap(void) 1940{ 1941 UpdateAttrs(normal); 1942#if NCURSES_EXT_FUNCS 1943 if (SP->_coloron 1944 && !SP->_default_color) { 1945 static const NCURSES_CH_T blank = NewChar(BLANK_TEXT); 1946 SP->_default_color = TRUE; 1947 _nc_do_color(-1, 0, FALSE, _nc_outch); 1948 SP->_default_color = FALSE; 1949 1950 mvcur(SP->_cursrow, SP->_curscol, screen_lines - 1, 0); 1951 1952 ClrToEOL(blank, TRUE); 1953 } 1954#endif 1955 if (SP->_color_defs) { 1956 _nc_reset_colors(); 1957 } 1958} 1959 1960#if USE_XMC_SUPPORT 1961NCURSES_EXPORT(void) 1962_nc_do_xmc_glitch(attr_t previous) 1963{ 1964 attr_t chg = XMC_CHANGES(previous ^ AttrOf(SCREEN_ATTRS(SP))); 1965 1966 while (chg != 0) { 1967 if (chg & 1) { 1968 SP->_curscol += magic_cookie_glitch; 1969 if (SP->_curscol >= SP->_columns) 1970 wrap_cursor(); 1971 TR(TRACE_UPDATE, ("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol)); 1972 } 1973 chg >>= 1; 1974 } 1975} 1976#endif /* USE_XMC_SUPPORT */ 1977