1/**************************************************************************** 2 * Copyright (c) 1998-2004,2005 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#ifdef __BEOS__ 48#undef false 49#undef true 50#include <OS.h> 51#endif 52 53#if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES 54#define USE_TRACE_TIMES 1 55#else 56#define USE_TRACE_TIMES 0 57#endif 58 59#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT 60#include <sys/time.h> 61#endif 62 63#if USE_TRACE_TIMES 64#include <sys/times.h> 65#endif 66 67#if USE_FUNC_POLL 68#elif HAVE_SELECT 69#if HAVE_SYS_SELECT_H 70#include <sys/select.h> 71#endif 72#endif 73 74#include <ctype.h> 75#include <term.h> 76 77MODULE_ID("$Id: tty_update.c,v 1.220 2005/08/13 17:12:32 tom Exp $") 78 79/* 80 * This define controls the line-breakout optimization. Every once in a 81 * while during screen refresh, we want to check for input and abort the 82 * update if there's some waiting. CHECK_INTERVAL controls the number of 83 * changed lines to be emitted between input checks. 84 * 85 * Note: Input-check-and-abort is no longer done if the screen is being 86 * updated from scratch. This is a feature, not a bug. 87 */ 88#define CHECK_INTERVAL 5 89 90#define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase) 91 92static const NCURSES_CH_T normal = NewChar2(BLANK_TEXT, BLANK_ATTR); 93 94/* 95 * Enable checking to see if doupdate and friends are tracking the true 96 * cursor position correctly. NOTE: this is a debugging hack which will 97 * work ONLY on ANSI-compatible terminals! 98 */ 99/* #define POSITION_DEBUG */ 100 101static inline NCURSES_CH_T ClrBlank(WINDOW *win); 102static int ClrBottom(int total); 103static void ClearScreen(NCURSES_CH_T blank); 104static void ClrUpdate(void); 105static void DelChar(int count); 106static void InsStr(NCURSES_CH_T * line, int count); 107static void TransformLine(int const lineno); 108 109#ifdef POSITION_DEBUG 110/**************************************************************************** 111 * 112 * Debugging code. Only works on ANSI-standard terminals. 113 * 114 ****************************************************************************/ 115 116static void 117position_check(int expected_y, int expected_x, char *legend) 118/* check to see if the real cursor position matches the virtual */ 119{ 120 char buf[20]; 121 char *s; 122 int y, x; 123 124 if (!_nc_tracing || (expected_y < 0 && expected_x < 0)) 125 return; 126 127 _nc_flush(); 128 memset(buf, '\0', sizeof(buf)); 129 putp("\033[6n"); /* only works on ANSI-compatibles */ 130 _nc_flush(); 131 *(s = buf) = 0; 132 do { 133 int ask = sizeof(buf) - 1 - (s - buf); 134 int got = read(0, s, ask); 135 if (got == 0) 136 break; 137 s += got; 138 } while (strchr(buf, 'R') == 0); 139 _tracef("probe returned %s", _nc_visbuf(buf)); 140 141 /* try to interpret as a position report */ 142 if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) { 143 _tracef("position probe failed in %s", legend); 144 } else { 145 if (expected_x < 0) 146 expected_x = x - 1; 147 if (expected_y < 0) 148 expected_y = y - 1; 149 if (y - 1 != expected_y || x - 1 != expected_x) { 150 beep(); 151 tputs(tparm("\033[%d;%dH", expected_y + 1, expected_x + 1), 1, _nc_outch); 152 _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s", 153 y - 1, x - 1, expected_y, expected_x, legend); 154 } else { 155 _tracef("position matches OK in %s", legend); 156 } 157 } 158} 159#else 160#define position_check(expected_y, expected_x, legend) /* nothing */ 161#endif /* POSITION_DEBUG */ 162 163/**************************************************************************** 164 * 165 * Optimized update code 166 * 167 ****************************************************************************/ 168 169static inline void 170GoTo(int const row, int const col) 171{ 172 TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)", 173 row, col, SP->_cursrow, SP->_curscol)); 174 175 position_check(SP->_cursrow, SP->_curscol, "GoTo"); 176 177 mvcur(SP->_cursrow, SP->_curscol, row, col); 178 position_check(SP->_cursrow, SP->_curscol, "GoTo2"); 179} 180 181static inline void 182PutAttrChar(CARG_CH_T ch) 183{ 184 int chlen = 1; 185 NCURSES_CH_T my_ch; 186 PUTC_DATA; 187 NCURSES_CH_T tilde; 188 NCURSES_CH_T attr = CHDEREF(ch); 189 190 TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)", 191 _tracech_t(ch), 192 SP->_cursrow, SP->_curscol)); 193#if USE_WIDEC_SUPPORT 194 /* 195 * If this is not a valid character, there is nothing more to do. 196 */ 197 if (isWidecExt(CHDEREF(ch))) { 198 TR(TRACE_CHARPUT, ("...skip")); 199 return; 200 } 201 /* 202 * Determine the number of character cells which the 'ch' value will use 203 * on the screen. It should be at least one. 204 */ 205 if ((chlen = wcwidth(CharOf(CHDEREF(ch)))) <= 0) { 206 static NCURSES_CH_T blank = NewChar(BLANK_TEXT); 207 208 if (is8bits(CharOf(CHDEREF(ch))) 209 && (isprint(CharOf(CHDEREF(ch))) 210 || (SP->_legacy_coding && CharOf(CHDEREF(ch)) >= 160))) { 211 ; 212 } else { 213 ch = CHREF(blank); 214 TR(TRACE_CHARPUT, ("forced to blank")); 215 } 216 chlen = 1; 217 } 218#endif 219 220 if ((AttrOf(attr) & A_ALTCHARSET) 221 && SP->_acs_map != 0 222 && CharOfD(ch) < ACS_LEN) { 223 my_ch = CHDEREF(ch); /* work around const param */ 224#if USE_WIDEC_SUPPORT 225 /* 226 * This is crude & ugly, but works most of the time. It checks if the 227 * acs_chars string specified that we have a mapping for this 228 * character, and uses the wide-character mapping when we expect the 229 * normal one to be broken (by mis-design ;-). 230 */ 231 if (SP->_screen_acs_fix 232 && SP->_screen_acs_map[CharOf(my_ch)]) { 233 RemAttr(attr, A_ALTCHARSET); 234 my_ch = _nc_wacs[CharOf(my_ch)]; 235 } 236#endif 237 /* 238 * If we (still) have alternate character set, it is the normal 8bit 239 * flavor. The _screen_acs_map[] array tells if the character was 240 * really in acs_chars, needed because of the way wide/normal line 241 * drawing flavors are integrated. 242 */ 243 if (AttrOf(attr) & A_ALTCHARSET) { 244 int j = CharOfD(ch); 245 chtype temp = UChar(SP->_acs_map[j]); 246 247 if (!(SP->_screen_acs_map[j])) 248 RemAttr(attr, A_ALTCHARSET); 249 if (temp != 0) 250 SetChar(my_ch, temp, AttrOf(attr)); 251 } 252 ch = CHREF(my_ch); 253 } 254 if (tilde_glitch && (CharOfD(ch) == L('~'))) { 255 SetChar(tilde, L('`'), AttrOf(attr)); 256 ch = CHREF(tilde); 257 } 258 259 UpdateAttrs(attr); 260#if !USE_WIDEC_SUPPORT 261 /* FIXME - we do this special case for signal handling, should see how to 262 * make it work for wide characters. 263 */ 264 if (SP->_outch != 0) { 265 SP->_outch(UChar(ch)); 266 } else 267#endif 268 { 269 PUTC(CHDEREF(ch), SP->_ofp); /* macro's fastest... */ 270 TRACE_OUTCHARS(1); 271 } 272 SP->_curscol += chlen; 273 if (char_padding) { 274 TPUTS_TRACE("char_padding"); 275 putp(char_padding); 276 } 277} 278 279static bool 280check_pending(void) 281/* check for pending input */ 282{ 283 bool have_pending = FALSE; 284 285 /* 286 * Only carry out this check when the flag is zero, otherwise we'll 287 * have the refreshing slow down drastically (or stop) if there's an 288 * unread character available. 289 */ 290 if (SP->_fifohold != 0) 291 return FALSE; 292 293 if (SP->_checkfd >= 0) { 294#if USE_FUNC_POLL 295 struct pollfd fds[1]; 296 fds[0].fd = SP->_checkfd; 297 fds[0].events = POLLIN; 298 if (poll(fds, 1, 0) > 0) { 299 have_pending = TRUE; 300 } 301#elif defined(__BEOS__) && !defined(__HAIKU__) 302 /* 303 * BeOS's select() is declared in socket.h, so the configure script does 304 * not see it. That's just as well, since that function works only for 305 * sockets. This (using snooze and ioctl) was distilled from Be's patch 306 * for ncurses which uses a separate thread to simulate select(). 307 * 308 * FIXME: the return values from the ioctl aren't very clear if we get 309 * interrupted. 310 */ 311 int n = 0; 312 int howmany = ioctl(0, 'ichr', &n); 313 if (howmany >= 0 && n > 0) { 314 have_pending = TRUE; 315 } 316#elif HAVE_SELECT 317 fd_set fdset; 318 struct timeval ktimeout; 319 320 ktimeout.tv_sec = 321 ktimeout.tv_usec = 0; 322 323 FD_ZERO(&fdset); 324 FD_SET(SP->_checkfd, &fdset); 325 if (select(SP->_checkfd + 1, &fdset, NULL, NULL, &ktimeout) != 0) { 326 have_pending = TRUE; 327 } 328#endif 329 } 330 if (have_pending) { 331 SP->_fifohold = 5; 332 _nc_flush(); 333 } 334 return FALSE; 335} 336 337/* put char at lower right corner */ 338static void 339PutCharLR(const ARG_CH_T ch) 340{ 341 if (!auto_right_margin) { 342 /* we can put the char directly */ 343 PutAttrChar(ch); 344 } else if (enter_am_mode && exit_am_mode) { 345 /* we can suppress automargin */ 346 TPUTS_TRACE("exit_am_mode"); 347 putp(exit_am_mode); 348 349 PutAttrChar(ch); 350 SP->_curscol--; 351 position_check(SP->_cursrow, SP->_curscol, "exit_am_mode"); 352 353 TPUTS_TRACE("enter_am_mode"); 354 putp(enter_am_mode); 355 } else if ((enter_insert_mode && exit_insert_mode) 356 || insert_character || parm_ich) { 357 GoTo(screen_lines - 1, screen_columns - 2); 358 PutAttrChar(ch); 359 GoTo(screen_lines - 1, screen_columns - 2); 360 InsStr(newscr->_line[screen_lines - 1].text + screen_columns - 2, 1); 361 } 362} 363 364static void 365wrap_cursor(void) 366{ 367 if (eat_newline_glitch) { 368 /* 369 * xenl can manifest two different ways. The vt100 370 * way is that, when you'd expect the cursor to wrap, 371 * it stays hung at the right margin (on top of the 372 * character just emitted) and doesn't wrap until the 373 * *next* graphic char is emitted. The c100 way is 374 * to ignore LF received just after an am wrap. 375 * 376 * An aggressive way to handle this would be to 377 * emit CR/LF after the char and then assume the wrap 378 * is done, you're on the first position of the next 379 * line, and the terminal out of its weird state. 380 * Here it's safe to just tell the code that the 381 * cursor is in hyperspace and let the next mvcur() 382 * call straighten things out. 383 */ 384 SP->_curscol = -1; 385 SP->_cursrow = -1; 386 } else if (auto_right_margin) { 387 SP->_curscol = 0; 388 SP->_cursrow++; 389 } else { 390 SP->_curscol--; 391 } 392 position_check(SP->_cursrow, SP->_curscol, "wrap_cursor"); 393} 394 395static inline void 396PutChar(const ARG_CH_T ch) 397/* insert character, handling automargin stuff */ 398{ 399 if (SP->_cursrow == screen_lines - 1 && SP->_curscol == screen_columns - 1) 400 PutCharLR(ch); 401 else 402 PutAttrChar(ch); 403 404 if (SP->_curscol >= screen_columns) 405 wrap_cursor(); 406 407 position_check(SP->_cursrow, SP->_curscol, "PutChar"); 408} 409 410/* 411 * Check whether the given character can be output by clearing commands. This 412 * includes test for being a space and not including any 'bad' attributes, such 413 * as A_REVERSE. All attribute flags which don't affect appearance of a space 414 * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded. 415 */ 416static inline bool 417can_clear_with(ARG_CH_T ch) 418{ 419 if (!back_color_erase && SP->_coloron) { 420#if NCURSES_EXT_FUNCS 421 int pair; 422 423 if (!SP->_default_color) 424 return FALSE; 425 if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK) 426 return FALSE; 427 if ((pair = GetPair(CHDEREF(ch))) != 0) { 428 short fg, bg; 429 pair_content(pair, &fg, &bg); 430 if (fg != C_MASK || bg != C_MASK) 431 return FALSE; 432 } 433#else 434 if (AttrOfD(ch) & A_COLOR) 435 return FALSE; 436#endif 437 } 438 return (ISBLANK(CHDEREF(ch)) && 439 (AttrOfD(ch) & ~(NONBLANK_ATTR | A_COLOR)) == BLANK_ATTR); 440} 441 442/* 443 * Issue a given span of characters from an array. 444 * Must be functionally equivalent to: 445 * for (i = 0; i < num; i++) 446 * PutChar(ntext[i]); 447 * but can leave the cursor positioned at the middle of the interval. 448 * 449 * Returns: 0 - cursor is at the end of interval 450 * 1 - cursor is somewhere in the middle 451 * 452 * This code is optimized using ech and rep. 453 */ 454static int 455EmitRange(const NCURSES_CH_T * ntext, int num) 456{ 457 int i; 458 459 if (erase_chars || repeat_char) { 460 while (num > 0) { 461 int runcount; 462 NCURSES_CH_T ntext0; 463 464 while (num > 1 && !CharEq(ntext[0], ntext[1])) { 465 PutChar(CHREF(ntext[0])); 466 ntext++; 467 num--; 468 } 469 ntext0 = ntext[0]; 470 if (num == 1) { 471 PutChar(CHREF(ntext0)); 472 return 0; 473 } 474 runcount = 2; 475 476 while (runcount < num && CharEq(ntext[runcount], ntext0)) 477 runcount++; 478 479 /* 480 * The cost expression in the middle isn't exactly right. 481 * _cup_ch_cost is an upper bound on the cost for moving to the 482 * end of the erased area, but not the cost itself (which we 483 * can't compute without emitting the move). This may result 484 * in erase_chars not getting used in some situations for 485 * which it would be marginally advantageous. 486 */ 487 if (erase_chars 488 && runcount > SP->_ech_cost + SP->_cup_ch_cost 489 && can_clear_with(CHREF(ntext0))) { 490 UpdateAttrs(ntext0); 491 putp(tparm(erase_chars, runcount)); 492 493 /* 494 * If this is the last part of the given interval, 495 * don't bother moving cursor, since it can be the 496 * last update on the line. 497 */ 498 if (runcount < num) { 499 GoTo(SP->_cursrow, SP->_curscol + runcount); 500 } else { 501 return 1; /* cursor stays in the middle */ 502 } 503 } else if (repeat_char && runcount > SP->_rep_cost) { 504 bool wrap_possible = (SP->_curscol + runcount >= screen_columns); 505 int rep_count = runcount; 506 507 if (wrap_possible) 508 rep_count--; 509 510 UpdateAttrs(ntext0); 511 tputs(tparm(repeat_char, CharOf(ntext0), rep_count), 512 rep_count, _nc_outch); 513 SP->_curscol += rep_count; 514 515 if (wrap_possible) 516 PutChar(CHREF(ntext0)); 517 } else { 518 for (i = 0; i < runcount; i++) 519 PutChar(CHREF(ntext[i])); 520 } 521 ntext += runcount; 522 num -= runcount; 523 } 524 return 0; 525 } 526 527 for (i = 0; i < num; i++) 528 PutChar(CHREF(ntext[i])); 529 return 0; 530} 531 532/* 533 * Output the line in the given range [first .. last] 534 * 535 * If there's a run of identical characters that's long enough to justify 536 * cursor movement, use that also. 537 * 538 * Returns: same as EmitRange 539 */ 540static int 541PutRange(const NCURSES_CH_T * otext, 542 const NCURSES_CH_T * ntext, 543 int row, 544 int first, int last) 545{ 546 int i, j, same; 547 548 TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)", 549 otext, ntext, row, first, last)); 550 551 if (otext != ntext 552 && (last - first + 1) > SP->_inline_cost) { 553 for (j = first, same = 0; j <= last; j++) { 554 if (!same && isWidecExt(otext[j])) 555 continue; 556 if (CharEq(otext[j], ntext[j])) { 557 same++; 558 } else { 559 if (same > SP->_inline_cost) { 560 EmitRange(ntext + first, j - same - first); 561 GoTo(row, first = j); 562 } 563 same = 0; 564 } 565 } 566 i = EmitRange(ntext + first, j - same - first); 567 /* 568 * Always return 1 for the next GoTo() after a PutRange() if we found 569 * identical characters at end of interval 570 */ 571 return (same == 0 ? i : 1); 572 } 573 return EmitRange(ntext + first, last - first + 1); 574} 575 576/* leave unbracketed here so 'indent' works */ 577#define MARK_NOCHANGE(win,row) \ 578 win->_line[row].firstchar = _NOCHANGE; \ 579 win->_line[row].lastchar = _NOCHANGE; \ 580 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row) 581 582NCURSES_EXPORT(int) 583doupdate(void) 584{ 585 int i; 586 int nonempty; 587#if USE_TRACE_TIMES 588 struct tms before, after; 589#endif /* USE_TRACE_TIMES */ 590 591 T((T_CALLED("doupdate()"))); 592 593#ifdef TRACE 594 if (_nc_tracing & TRACE_UPDATE) { 595 if (curscr->_clear) 596 _tracef("curscr is clear"); 597 else 598 _tracedump("curscr", curscr); 599 _tracedump("newscr", newscr); 600 } 601#endif /* TRACE */ 602 603 _nc_signal_handler(FALSE); 604 605 if (SP->_fifohold) 606 SP->_fifohold--; 607 608#if USE_SIZECHANGE 609 if (SP->_endwin || SP->_sig_winch) { 610 /* 611 * This is a transparent extension: XSI does not address it, 612 * and applications need not know that ncurses can do it. 613 * 614 * Check if the terminal size has changed while curses was off 615 * (this can happen in an xterm, for example), and resize the 616 * ncurses data structures accordingly. 617 */ 618 _nc_update_screensize(); 619 } 620#endif 621 622 if (SP->_endwin) { 623 624 T(("coming back from shell mode")); 625 reset_prog_mode(); 626 627 _nc_mvcur_resume(); 628 _nc_screen_resume(); 629 SP->_mouse_resume(SP); 630 631 SP->_endwin = FALSE; 632 } 633#if USE_TRACE_TIMES 634 /* zero the metering machinery */ 635 _nc_outchars = 0; 636 (void) times(&before); 637#endif /* USE_TRACE_TIMES */ 638 639 /* 640 * This is the support for magic-cookie terminals. The 641 * theory: we scan the virtual screen looking for attribute 642 * turnons. Where we find one, check to make sure it's 643 * realizable by seeing if the required number of 644 * un-attributed blanks are present before and after the 645 * attributed range; try to shift the range boundaries over 646 * blanks (not changing the screen display) so this becomes 647 * true. If it is, shift the beginning attribute change 648 * appropriately (the end one, if we've gotten this far, is 649 * guaranteed room for its cookie). If not, nuke the added 650 * attributes out of the span. 651 */ 652#if USE_XMC_SUPPORT 653 if (magic_cookie_glitch > 0) { 654 int j, k; 655 attr_t rattr = A_NORMAL; 656 657 for (i = 0; i < screen_lines; i++) { 658 for (j = 0; j < screen_columns; j++) { 659 bool failed = FALSE; 660 attr_t turnon = AttrOf(newscr->_line[i].text[j]) & ~rattr; 661 662 /* is an attribute turned on here? */ 663 if (turnon == 0) { 664 rattr = AttrOf(newscr->_line[i].text[j]); 665 continue; 666 } 667 668 TR(TRACE_ATTRS, ("At (%d, %d): from %s...", i, j, _traceattr(rattr))); 669 TR(TRACE_ATTRS, ("...to %s", _traceattr(turnon))); 670 671 /* 672 * If the attribute change location is a blank with a 673 * "safe" attribute, undo the attribute turnon. This may 674 * ensure there's enough room to set the attribute before 675 * the first non-blank in the run. 676 */ 677#define SAFE(a) (!((a) & (attr_t)~NONBLANK_ATTR)) 678 if (ISBLANK(newscr->_line[i].text[j]) && SAFE(turnon)) { 679 RemAttr(newscr->_line[i].text[j], turnon); 680 continue; 681 } 682 683 /* check that there's enough room at start of span */ 684 for (k = 1; k <= magic_cookie_glitch; k++) { 685 if (j - k < 0 686 || !ISBLANK(newscr->_line[i].text[j - k]) 687 || !SAFE(AttrOf(newscr->_line[i].text[j - k]))) 688 failed = TRUE; 689 } 690 if (!failed) { 691 bool end_onscreen = FALSE; 692 int m, n = j; 693 694 /* find end of span, if it's onscreen */ 695 for (m = i; m < screen_lines; m++) { 696 for (; n < screen_columns; n++) { 697 if (AttrOf(newscr->_line[m].text[n]) == rattr) { 698 end_onscreen = TRUE; 699 TR(TRACE_ATTRS, 700 ("Range attributed with %s ends at (%d, %d)", 701 _traceattr(turnon), m, n)); 702 goto foundit; 703 } 704 } 705 n = 0; 706 } 707 TR(TRACE_ATTRS, 708 ("Range attributed with %s ends offscreen", 709 _traceattr(turnon))); 710 foundit:; 711 712 if (end_onscreen) { 713 NCURSES_CH_T *lastline = newscr->_line[m].text; 714 715 /* 716 * If there are safely-attributed blanks at the 717 * end of the range, shorten the range. This will 718 * help ensure that there is enough room at end 719 * of span. 720 */ 721 while (n >= 0 722 && ISBLANK(lastline[n]) 723 && SAFE(AttrOf(lastline[n]))) 724 RemAttr(lastline[n--], turnon); 725 726 /* check that there's enough room at end of span */ 727 for (k = 1; k <= magic_cookie_glitch; k++) 728 if (n + k >= screen_columns 729 || !ISBLANK(lastline[n + k]) 730 || !SAFE(AttrOf(lastline[n + k]))) 731 failed = TRUE; 732 } 733 } 734 735 if (failed) { 736 int p, q = j; 737 738 TR(TRACE_ATTRS, 739 ("Clearing %s beginning at (%d, %d)", 740 _traceattr(turnon), i, j)); 741 742 /* turn off new attributes over span */ 743 for (p = i; p < screen_lines; p++) { 744 for (; q < screen_columns; q++) { 745 if (AttrOf(newscr->_line[p].text[q]) == rattr) 746 goto foundend; 747 RemAttr(newscr->_line[p].text[q], turnon); 748 } 749 q = 0; 750 } 751 foundend:; 752 } else { 753 TR(TRACE_ATTRS, 754 ("Cookie space for %s found before (%d, %d)", 755 _traceattr(turnon), i, j)); 756 757 /* 758 * back up the start of range so there's room 759 * for cookies before the first nonblank character 760 */ 761 for (k = 1; k <= magic_cookie_glitch; k++) 762 AddAttr(newscr->_line[i].text[j - k], turnon); 763 } 764 765 rattr = AttrOf(newscr->_line[i].text[j]); 766 } 767 } 768 769#ifdef TRACE 770 /* show altered highlights after magic-cookie check */ 771 if (_nc_tracing & TRACE_UPDATE) { 772 _tracef("After magic-cookie check..."); 773 _tracedump("newscr", newscr); 774 } 775#endif /* TRACE */ 776 } 777#endif /* USE_XMC_SUPPORT */ 778 779 nonempty = 0; 780 if (curscr->_clear || newscr->_clear) { /* force refresh ? */ 781 TR(TRACE_UPDATE, ("clearing and updating from scratch")); 782 ClrUpdate(); 783 curscr->_clear = FALSE; /* reset flag */ 784 newscr->_clear = FALSE; /* reset flag */ 785 } else { 786 int changedlines = CHECK_INTERVAL; 787 788 if (check_pending()) 789 goto cleanup; 790 791 nonempty = min(screen_lines, newscr->_maxy + 1); 792 793 if (SP->_scrolling) { 794 _nc_scroll_optimize(); 795 } 796 797 nonempty = ClrBottom(nonempty); 798 799 TR(TRACE_UPDATE, ("Transforming lines, nonempty %d", nonempty)); 800 for (i = 0; i < nonempty; i++) { 801 /* 802 * Here is our line-breakout optimization. 803 */ 804 if (changedlines == CHECK_INTERVAL) { 805 if (check_pending()) 806 goto cleanup; 807 changedlines = 0; 808 } 809 810 /* 811 * newscr->line[i].firstchar is normally set 812 * by wnoutrefresh. curscr->line[i].firstchar 813 * is normally set by _nc_scroll_window in the 814 * vertical-movement optimization code, 815 */ 816 if (newscr->_line[i].firstchar != _NOCHANGE 817 || curscr->_line[i].firstchar != _NOCHANGE) { 818 TransformLine(i); 819 changedlines++; 820 } 821 822 /* mark line changed successfully */ 823 if (i <= newscr->_maxy) { 824 MARK_NOCHANGE(newscr, i); 825 } 826 if (i <= curscr->_maxy) { 827 MARK_NOCHANGE(curscr, i); 828 } 829 } 830 } 831 832 /* put everything back in sync */ 833 for (i = nonempty; i <= newscr->_maxy; i++) { 834 MARK_NOCHANGE(newscr, i); 835 } 836 for (i = nonempty; i <= curscr->_maxy; i++) { 837 MARK_NOCHANGE(curscr, i); 838 } 839 840 if (!newscr->_leaveok) { 841 curscr->_curx = newscr->_curx; 842 curscr->_cury = newscr->_cury; 843 844 GoTo(curscr->_cury, curscr->_curx); 845 } 846 847 cleanup: 848 /* 849 * Keep the physical screen in normal mode in case we get other 850 * processes writing to the screen. 851 */ 852 UpdateAttrs(normal); 853 854 _nc_flush(); 855 curscr->_attrs = newscr->_attrs; 856 857#if USE_TRACE_TIMES 858 (void) times(&after); 859 TR(TRACE_TIMES, 860 ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time", 861 _nc_outchars, 862 (long) (after.tms_stime - before.tms_stime), 863 (long) (after.tms_utime - before.tms_utime))); 864#endif /* USE_TRACE_TIMES */ 865 866 _nc_signal_handler(TRUE); 867 868 returnCode(OK); 869} 870 871/* 872 * ClrBlank(win) 873 * 874 * Returns the attributed character that corresponds to the "cleared" 875 * screen. If the terminal has the back-color-erase feature, this will be 876 * colored according to the wbkgd() call. 877 * 878 * We treat 'curscr' specially because it isn't supposed to be set directly 879 * in the wbkgd() call. Assume 'stdscr' for this case. 880 */ 881#define BCE_ATTRS (A_NORMAL|A_COLOR) 882#define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_nc_bkgd) 883 884static inline NCURSES_CH_T 885ClrBlank(WINDOW *win) 886{ 887 NCURSES_CH_T blank = NewChar(BLANK_TEXT); 888 if (back_color_erase) 889 AddAttr(blank, (AttrOf(BCE_BKGD(win)) & BCE_ATTRS)); 890 return blank; 891} 892 893/* 894** ClrUpdate() 895** 896** Update by clearing and redrawing the entire screen. 897** 898*/ 899 900static void 901ClrUpdate(void) 902{ 903 int i; 904 NCURSES_CH_T blank = ClrBlank(stdscr); 905 int nonempty = min(screen_lines, newscr->_maxy + 1); 906 907 TR(TRACE_UPDATE, ("ClrUpdate() called")); 908 909 ClearScreen(blank); 910 911 TR(TRACE_UPDATE, ("updating screen from scratch")); 912 913 nonempty = ClrBottom(nonempty); 914 915 for (i = 0; i < nonempty; i++) 916 TransformLine(i); 917} 918 919/* 920** ClrToEOL(blank) 921** 922** Clear to end of current line, starting at the cursor position 923*/ 924 925static void 926ClrToEOL(NCURSES_CH_T blank, bool needclear) 927{ 928 int j; 929 930 if (curscr != 0 931 && SP->_cursrow >= 0) { 932 for (j = SP->_curscol; j < screen_columns; j++) { 933 if (j >= 0) { 934 NCURSES_CH_T *cp = &(curscr->_line[SP->_cursrow].text[j]); 935 936 if (!CharEq(*cp, blank)) { 937 *cp = blank; 938 needclear = TRUE; 939 } 940 } 941 } 942 } else { 943 needclear = TRUE; 944 } 945 946 if (needclear) { 947 UpdateAttrs(blank); 948 TPUTS_TRACE("clr_eol"); 949 if (clr_eol && SP->_el_cost <= (screen_columns - SP->_curscol)) { 950 putp(clr_eol); 951 } else { 952 int count = (screen_columns - SP->_curscol); 953 while (count-- > 0) 954 PutChar(CHREF(blank)); 955 } 956 } 957} 958 959/* 960** ClrToEOS(blank) 961** 962** Clear to end of screen, starting at the cursor position 963*/ 964 965static void 966ClrToEOS(NCURSES_CH_T blank) 967{ 968 int row, col; 969 970 row = SP->_cursrow; 971 col = SP->_curscol; 972 973 UpdateAttrs(blank); 974 TPUTS_TRACE("clr_eos"); 975 tputs(clr_eos, screen_lines - row, _nc_outch); 976 977 while (col < screen_columns) 978 curscr->_line[row].text[col++] = blank; 979 980 for (row++; row < screen_lines; row++) { 981 for (col = 0; col < screen_columns; col++) 982 curscr->_line[row].text[col] = blank; 983 } 984} 985 986/* 987 * ClrBottom(total) 988 * 989 * Test if clearing the end of the screen would satisfy part of the 990 * screen-update. Do this by scanning backwards through the lines in the 991 * screen, checking if each is blank, and one or more are changed. 992 */ 993static int 994ClrBottom(int total) 995{ 996 int row; 997 int col; 998 int top = total; 999 int last = min(screen_columns, newscr->_maxx + 1); 1000 NCURSES_CH_T blank = newscr->_line[total - 1].text[last - 1]; 1001 bool ok; 1002 1003 if (clr_eos && can_clear_with(CHREF(blank))) { 1004 1005 for (row = total - 1; row >= 0; row--) { 1006 for (col = 0, ok = TRUE; ok && col < last; col++) { 1007 ok = (CharEq(newscr->_line[row].text[col], blank)); 1008 } 1009 if (!ok) 1010 break; 1011 1012 for (col = 0; ok && col < last; col++) { 1013 ok = (CharEq(curscr->_line[row].text[col], blank)); 1014 } 1015 if (!ok) 1016 top = row; 1017 } 1018 1019 /* don't use clr_eos for just one line if clr_eol available */ 1020 if (top < total) { 1021 GoTo(top, 0); 1022 ClrToEOS(blank); 1023 if (SP->oldhash && SP->newhash) { 1024 for (row = top; row < screen_lines; row++) 1025 SP->oldhash[row] = SP->newhash[row]; 1026 } 1027 } 1028 } 1029 return top; 1030} 1031 1032#if USE_XMC_SUPPORT 1033#if USE_WIDEC_SUPPORT 1034static inline bool 1035check_xmc_transition(NCURSES_CH_T * a, NCURSES_CH_T * b) 1036{ 1037 if (((a->attr ^ b->attr) & ~(a->attr) & SP->_xmc_triggers) != 0) { 1038 return TRUE; 1039 } 1040 return FALSE; 1041} 1042#define xmc_turn_on(a,b) check_xmc_transition(&(a), &(b)) 1043#else 1044#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0) 1045#endif 1046 1047#define xmc_new(r,c) newscr->_line[r].text[c] 1048#define xmc_turn_off(a,b) xmc_turn_on(b,a) 1049#endif /* USE_XMC_SUPPORT */ 1050 1051/* 1052** TransformLine(lineno) 1053** 1054** Transform the given line in curscr to the one in newscr, using 1055** Insert/Delete Character if _nc_idcok && has_ic(). 1056** 1057** firstChar = position of first different character in line 1058** oLastChar = position of last different character in old line 1059** nLastChar = position of last different character in new line 1060** 1061** move to firstChar 1062** overwrite chars up to min(oLastChar, nLastChar) 1063** if oLastChar < nLastChar 1064** insert newLine[oLastChar+1..nLastChar] 1065** else 1066** delete oLastChar - nLastChar spaces 1067*/ 1068 1069static void 1070TransformLine(int const lineno) 1071{ 1072 int firstChar, oLastChar, nLastChar; 1073 NCURSES_CH_T *newLine = newscr->_line[lineno].text; 1074 NCURSES_CH_T *oldLine = curscr->_line[lineno].text; 1075 int n; 1076 bool attrchanged = FALSE; 1077 1078 TR(TRACE_UPDATE, (T_CALLED("TransformLine(%d)"), lineno)); 1079 1080 /* copy new hash value to old one */ 1081 if (SP->oldhash && SP->newhash) 1082 SP->oldhash[lineno] = SP->newhash[lineno]; 1083 1084 /* 1085 * If we have colors, there is the possibility of having two color pairs 1086 * that display as the same colors. For instance, Lynx does this. Check 1087 * for this case, and update the old line with the new line's colors when 1088 * they are equivalent. 1089 */ 1090 if (SP->_coloron) { 1091 int oldPair; 1092 int newPair; 1093 1094 for (n = 0; n < screen_columns; n++) { 1095 if (!CharEq(newLine[n], oldLine[n])) { 1096 oldPair = GetPair(oldLine[n]); 1097 newPair = GetPair(newLine[n]); 1098 if (oldPair != newPair 1099 && unColor(oldLine[n]) == unColor(newLine[n])) { 1100 if (oldPair < COLOR_PAIRS 1101 && newPair < COLOR_PAIRS 1102 && SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) { 1103 SetPair(oldLine[n], GetPair(newLine[n])); 1104 } 1105 } 1106 } 1107 } 1108 } 1109 1110 if (ceol_standout_glitch && clr_eol) { 1111 firstChar = 0; 1112 while (firstChar < screen_columns) { 1113 if (!SameAttrOf(newLine[firstChar], oldLine[firstChar])) { 1114 attrchanged = TRUE; 1115 break; 1116 } 1117 firstChar++; 1118 } 1119 } 1120 1121 firstChar = 0; 1122 1123 if (attrchanged) { /* we may have to disregard the whole line */ 1124 GoTo(lineno, firstChar); 1125 ClrToEOL(ClrBlank(curscr), FALSE); 1126 PutRange(oldLine, newLine, lineno, 0, (screen_columns - 1)); 1127#if USE_XMC_SUPPORT 1128 1129 /* 1130 * This is a very simple loop to paint characters which may have the 1131 * magic cookie glitch embedded. It doesn't know much about video 1132 * attributes which are continued from one line to the next. It 1133 * assumes that we have filtered out requests for attribute changes 1134 * that do not get mapped to blank positions. 1135 * 1136 * FIXME: we are not keeping track of where we put the cookies, so this 1137 * will work properly only once, since we may overwrite a cookie in a 1138 * following operation. 1139 */ 1140 } else if (magic_cookie_glitch > 0) { 1141 GoTo(lineno, firstChar); 1142 for (n = 0; n < screen_columns; n++) { 1143 int m = n + magic_cookie_glitch; 1144 1145 /* check for turn-on: 1146 * If we are writing an attributed blank, where the 1147 * previous cell is not attributed. 1148 */ 1149 if (ISBLANK(newLine[n]) 1150 && ((n > 0 1151 && xmc_turn_on(newLine[n - 1], newLine[n])) 1152 || (n == 0 1153 && lineno > 0 1154 && xmc_turn_on(xmc_new(lineno - 1, screen_columns - 1), 1155 newLine[n])))) { 1156 n = m; 1157 } 1158 1159 PutChar(CHREF(newLine[n])); 1160 1161 /* check for turn-off: 1162 * If we are writing an attributed non-blank, where the 1163 * next cell is blank, and not attributed. 1164 */ 1165 if (!ISBLANK(newLine[n]) 1166 && ((n + 1 < screen_columns 1167 && xmc_turn_off(newLine[n], newLine[n + 1])) 1168 || (n + 1 >= screen_columns 1169 && lineno + 1 < screen_lines 1170 && xmc_turn_off(newLine[n], xmc_new(lineno + 1, 0))))) { 1171 n = m; 1172 } 1173 1174 } 1175#endif 1176 } else { 1177 NCURSES_CH_T blank; 1178 1179 /* it may be cheap to clear leading whitespace with clr_bol */ 1180 blank = newLine[0]; 1181 if (clr_bol && can_clear_with(CHREF(blank))) { 1182 int oFirstChar, nFirstChar; 1183 1184 for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++) 1185 if (!CharEq(oldLine[oFirstChar], blank)) 1186 break; 1187 for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++) 1188 if (!CharEq(newLine[nFirstChar], blank)) 1189 break; 1190 1191 if (nFirstChar == oFirstChar) { 1192 firstChar = nFirstChar; 1193 /* find the first differing character */ 1194 while (firstChar < screen_columns 1195 && CharEq(newLine[firstChar], oldLine[firstChar])) 1196 firstChar++; 1197 } else if (oFirstChar > nFirstChar) { 1198 firstChar = nFirstChar; 1199 } else { /* oFirstChar < nFirstChar */ 1200 firstChar = oFirstChar; 1201 if (SP->_el1_cost < nFirstChar - oFirstChar) { 1202 if (nFirstChar >= screen_columns 1203 && SP->_el_cost <= SP->_el1_cost) { 1204 GoTo(lineno, 0); 1205 UpdateAttrs(blank); 1206 TPUTS_TRACE("clr_eol"); 1207 putp(clr_eol); 1208 } else { 1209 GoTo(lineno, nFirstChar - 1); 1210 UpdateAttrs(blank); 1211 TPUTS_TRACE("clr_bol"); 1212 putp(clr_bol); 1213 } 1214 1215 while (firstChar < nFirstChar) 1216 oldLine[firstChar++] = blank; 1217 } 1218 } 1219 } else { 1220 /* find the first differing character */ 1221 while (firstChar < screen_columns 1222 && CharEq(newLine[firstChar], oldLine[firstChar])) 1223 firstChar++; 1224 } 1225 /* if there wasn't one, we're done */ 1226 if (firstChar >= screen_columns) { 1227 TR(TRACE_UPDATE, (T_RETURN(""))); 1228 return; 1229 } 1230 1231 blank = newLine[screen_columns - 1]; 1232 1233 if (!can_clear_with(CHREF(blank))) { 1234 /* find the last differing character */ 1235 nLastChar = screen_columns - 1; 1236 1237 while (nLastChar > firstChar 1238 && CharEq(newLine[nLastChar], oldLine[nLastChar])) 1239 nLastChar--; 1240 1241 if (nLastChar >= firstChar) { 1242 GoTo(lineno, firstChar); 1243 PutRange(oldLine, newLine, lineno, firstChar, nLastChar); 1244 memcpy(oldLine + firstChar, 1245 newLine + firstChar, 1246 (nLastChar - firstChar + 1) * sizeof(NCURSES_CH_T)); 1247 } 1248 TR(TRACE_UPDATE, (T_RETURN(""))); 1249 return; 1250 } 1251 1252 /* find last non-blank character on old line */ 1253 oLastChar = screen_columns - 1; 1254 while (oLastChar > firstChar && CharEq(oldLine[oLastChar], blank)) 1255 oLastChar--; 1256 1257 /* find last non-blank character on new line */ 1258 nLastChar = screen_columns - 1; 1259 while (nLastChar > firstChar && CharEq(newLine[nLastChar], blank)) 1260 nLastChar--; 1261 1262 if ((nLastChar == firstChar) 1263 && (SP->_el_cost < (oLastChar - nLastChar))) { 1264 GoTo(lineno, firstChar); 1265 if (!CharEq(newLine[firstChar], blank)) 1266 PutChar(CHREF(newLine[firstChar])); 1267 ClrToEOL(blank, FALSE); 1268 } else if ((nLastChar != oLastChar) 1269 && (!CharEq(newLine[nLastChar], oldLine[oLastChar]) 1270 || !(_nc_idcok && has_ic()))) { 1271 GoTo(lineno, firstChar); 1272 if ((oLastChar - nLastChar) > SP->_el_cost) { 1273 if (PutRange(oldLine, newLine, lineno, firstChar, nLastChar)) 1274 GoTo(lineno, nLastChar + 1); 1275 ClrToEOL(blank, FALSE); 1276 } else { 1277 n = max(nLastChar, oLastChar); 1278 PutRange(oldLine, newLine, lineno, firstChar, n); 1279 } 1280 } else { 1281 int nLastNonblank = nLastChar; 1282 int oLastNonblank = oLastChar; 1283 1284 /* find the last characters that really differ */ 1285 /* can be -1 if no characters differ */ 1286 while (CharEq(newLine[nLastChar], oldLine[oLastChar])) { 1287 /* don't split a wide char */ 1288 if (isWidecExt(newLine[nLastChar]) && 1289 !CharEq(newLine[nLastChar - 1], oldLine[oLastChar - 1])) 1290 break; 1291 nLastChar--; 1292 oLastChar--; 1293 if (nLastChar == -1 || oLastChar == -1) 1294 break; 1295 } 1296 1297 n = min(oLastChar, nLastChar); 1298 if (n >= firstChar) { 1299 GoTo(lineno, firstChar); 1300 PutRange(oldLine, newLine, lineno, firstChar, n); 1301 } 1302 1303 if (oLastChar < nLastChar) { 1304 int m = max(nLastNonblank, oLastNonblank); 1305#if USE_WIDEC_SUPPORT 1306 while (isWidecExt(newLine[n + 1]) && n) { 1307 --n; 1308 --oLastChar; 1309 } 1310#endif 1311 GoTo(lineno, n + 1); 1312 if ((nLastChar < nLastNonblank) 1313 || InsCharCost(nLastChar - oLastChar) > (m - n)) { 1314 PutRange(oldLine, newLine, lineno, n + 1, m); 1315 } else { 1316 InsStr(&newLine[n + 1], nLastChar - oLastChar); 1317 } 1318 } else if (oLastChar > nLastChar) { 1319 GoTo(lineno, n + 1); 1320 if (DelCharCost(oLastChar - nLastChar) 1321 > SP->_el_cost + nLastNonblank - (n + 1)) { 1322 if (PutRange(oldLine, newLine, lineno, 1323 n + 1, nLastNonblank)) 1324 GoTo(lineno, nLastNonblank + 1); 1325 ClrToEOL(blank, FALSE); 1326 } else { 1327 /* 1328 * The delete-char sequence will 1329 * effectively shift in blanks from the 1330 * right margin of the screen. Ensure 1331 * that they are the right color by 1332 * setting the video attributes from 1333 * the last character on the row. 1334 */ 1335 UpdateAttrs(blank); 1336 DelChar(oLastChar - nLastChar); 1337 } 1338 } 1339 } 1340 } 1341 1342 /* update the code's internal representation */ 1343 if (screen_columns > firstChar) 1344 memcpy(oldLine + firstChar, 1345 newLine + firstChar, 1346 (screen_columns - firstChar) * sizeof(NCURSES_CH_T)); 1347 TR(TRACE_UPDATE, (T_RETURN(""))); 1348 return; 1349} 1350 1351/* 1352** ClearScreen(blank) 1353** 1354** Clear the physical screen and put cursor at home 1355** 1356*/ 1357 1358static void 1359ClearScreen(NCURSES_CH_T blank) 1360{ 1361 int i, j; 1362 bool fast_clear = (clear_screen || clr_eos || clr_eol); 1363 1364 TR(TRACE_UPDATE, ("ClearScreen() called")); 1365 1366#if NCURSES_EXT_FUNCS 1367 if (SP->_coloron 1368 && !SP->_default_color) { 1369 _nc_do_color(GET_SCREEN_PAIR(SP), 0, FALSE, _nc_outch); 1370 if (!back_color_erase) { 1371 fast_clear = FALSE; 1372 } 1373 } 1374#endif 1375 1376 if (fast_clear) { 1377 if (clear_screen) { 1378 UpdateAttrs(blank); 1379 TPUTS_TRACE("clear_screen"); 1380 putp(clear_screen); 1381 SP->_cursrow = SP->_curscol = 0; 1382 position_check(SP->_cursrow, SP->_curscol, "ClearScreen"); 1383 } else if (clr_eos) { 1384 SP->_cursrow = SP->_curscol = -1; 1385 GoTo(0, 0); 1386 1387 UpdateAttrs(blank); 1388 TPUTS_TRACE("clr_eos"); 1389 tputs(clr_eos, screen_lines, _nc_outch); 1390 } else if (clr_eol) { 1391 SP->_cursrow = SP->_curscol = -1; 1392 1393 UpdateAttrs(blank); 1394 for (i = 0; i < screen_lines; i++) { 1395 GoTo(i, 0); 1396 TPUTS_TRACE("clr_eol"); 1397 putp(clr_eol); 1398 } 1399 GoTo(0, 0); 1400 } 1401 } else { 1402 UpdateAttrs(blank); 1403 for (i = 0; i < screen_lines; i++) { 1404 GoTo(i, 0); 1405 for (j = 0; j < screen_columns; j++) 1406 PutChar(CHREF(blank)); 1407 } 1408 GoTo(0, 0); 1409 } 1410 1411 for (i = 0; i < screen_lines; i++) { 1412 for (j = 0; j < screen_columns; j++) 1413 curscr->_line[i].text[j] = blank; 1414 } 1415 1416 TR(TRACE_UPDATE, ("screen cleared")); 1417} 1418 1419/* 1420** InsStr(line, count) 1421** 1422** Insert the count characters pointed to by line. 1423** 1424*/ 1425 1426static void 1427InsStr(NCURSES_CH_T * line, int count) 1428{ 1429 TR(TRACE_UPDATE, ("InsStr(%p,%d) called", line, count)); 1430 1431 /* Prefer parm_ich as it has the smallest cost - no need to shift 1432 * the whole line on each character. */ 1433 /* The order must match that of InsCharCost. */ 1434 if (parm_ich) { 1435 TPUTS_TRACE("parm_ich"); 1436 tputs(tparm(parm_ich, count), count, _nc_outch); 1437 while (count) { 1438 PutAttrChar(CHREF(*line)); 1439 line++; 1440 count--; 1441 } 1442 } else if (enter_insert_mode && exit_insert_mode) { 1443 TPUTS_TRACE("enter_insert_mode"); 1444 putp(enter_insert_mode); 1445 while (count) { 1446 PutAttrChar(CHREF(*line)); 1447 if (insert_padding) { 1448 TPUTS_TRACE("insert_padding"); 1449 putp(insert_padding); 1450 } 1451 line++; 1452 count--; 1453 } 1454 TPUTS_TRACE("exit_insert_mode"); 1455 putp(exit_insert_mode); 1456 } else { 1457 while (count) { 1458 TPUTS_TRACE("insert_character"); 1459 putp(insert_character); 1460 PutAttrChar(CHREF(*line)); 1461 if (insert_padding) { 1462 TPUTS_TRACE("insert_padding"); 1463 putp(insert_padding); 1464 } 1465 line++; 1466 count--; 1467 } 1468 } 1469 position_check(SP->_cursrow, SP->_curscol, "InsStr"); 1470} 1471 1472/* 1473** DelChar(count) 1474** 1475** Delete count characters at current position 1476** 1477*/ 1478 1479static void 1480DelChar(int count) 1481{ 1482 int n; 1483 1484 TR(TRACE_UPDATE, ("DelChar(%d) called, position = (%d,%d)", count, 1485 newscr->_cury, newscr->_curx)); 1486 1487 if (parm_dch) { 1488 TPUTS_TRACE("parm_dch"); 1489 tputs(tparm(parm_dch, count), count, _nc_outch); 1490 } else { 1491 for (n = 0; n < count; n++) { 1492 TPUTS_TRACE("delete_character"); 1493 putp(delete_character); 1494 } 1495 } 1496} 1497 1498/* 1499 * Physical-scrolling support 1500 * 1501 * This code was adapted from Keith Bostic's hardware scrolling 1502 * support for 4.4BSD curses. I (esr) translated it to use terminfo 1503 * capabilities, narrowed the call interface slightly, and cleaned 1504 * up some convoluted tests. I also added support for the memory_above 1505 * memory_below, and non_dest_scroll_region capabilities. 1506 * 1507 * For this code to work, we must have either 1508 * change_scroll_region and scroll forward/reverse commands, or 1509 * insert and delete line capabilities. 1510 * When the scrolling region has been set, the cursor has to 1511 * be at the last line of the region to make the scroll up 1512 * happen, or on the first line of region to scroll down. 1513 * 1514 * This code makes one aesthetic decision in the opposite way from 1515 * BSD curses. BSD curses preferred pairs of il/dl operations 1516 * over scrolls, allegedly because il/dl looked faster. We, on 1517 * the other hand, prefer scrolls because (a) they're just as fast 1518 * on many terminals and (b) using them avoids bouncing an 1519 * unchanged bottom section of the screen up and down, which is 1520 * visually nasty. 1521 * 1522 * (lav): added more cases, used dl/il when bot==maxy and in csr case. 1523 * 1524 * I used assumption that capabilities il/il1/dl/dl1 work inside 1525 * changed scroll region not shifting screen contents outside of it. 1526 * If there are any terminals behaving different way, it would be 1527 * necessary to add some conditions to scroll_csr_forward/backward. 1528 */ 1529 1530/* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */ 1531static int 1532scroll_csr_forward(int n, int top, int bot, int miny, int maxy, NCURSES_CH_T blank) 1533{ 1534 int i; 1535 1536 if (n == 1 && scroll_forward && top == miny && bot == maxy) { 1537 GoTo(bot, 0); 1538 UpdateAttrs(blank); 1539 TPUTS_TRACE("scroll_forward"); 1540 putp(scroll_forward); 1541 } else if (n == 1 && delete_line && bot == maxy) { 1542 GoTo(top, 0); 1543 UpdateAttrs(blank); 1544 TPUTS_TRACE("delete_line"); 1545 putp(delete_line); 1546 } else if (parm_index && top == miny && bot == maxy) { 1547 GoTo(bot, 0); 1548 UpdateAttrs(blank); 1549 TPUTS_TRACE("parm_index"); 1550 tputs(tparm(parm_index, n, 0), n, _nc_outch); 1551 } else if (parm_delete_line && bot == maxy) { 1552 GoTo(top, 0); 1553 UpdateAttrs(blank); 1554 TPUTS_TRACE("parm_delete_line"); 1555 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1556 } else if (scroll_forward && top == miny && bot == maxy) { 1557 GoTo(bot, 0); 1558 UpdateAttrs(blank); 1559 for (i = 0; i < n; i++) { 1560 TPUTS_TRACE("scroll_forward"); 1561 putp(scroll_forward); 1562 } 1563 } else if (delete_line && bot == maxy) { 1564 GoTo(top, 0); 1565 UpdateAttrs(blank); 1566 for (i = 0; i < n; i++) { 1567 TPUTS_TRACE("delete_line"); 1568 putp(delete_line); 1569 } 1570 } else 1571 return ERR; 1572 1573#if NCURSES_EXT_FUNCS 1574 if (FILL_BCE()) { 1575 int j; 1576 for (i = 0; i < n; i++) { 1577 GoTo(bot - i, 0); 1578 for (j = 0; j < screen_columns; j++) 1579 PutChar(CHREF(blank)); 1580 } 1581 } 1582#endif 1583 return OK; 1584} 1585 1586/* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */ 1587/* n > 0 */ 1588static int 1589scroll_csr_backward(int n, int top, int bot, int miny, int maxy, 1590 NCURSES_CH_T blank) 1591{ 1592 int i; 1593 1594 if (n == 1 && scroll_reverse && top == miny && bot == maxy) { 1595 GoTo(top, 0); 1596 UpdateAttrs(blank); 1597 TPUTS_TRACE("scroll_reverse"); 1598 putp(scroll_reverse); 1599 } else if (n == 1 && insert_line && bot == maxy) { 1600 GoTo(top, 0); 1601 UpdateAttrs(blank); 1602 TPUTS_TRACE("insert_line"); 1603 putp(insert_line); 1604 } else if (parm_rindex && top == miny && bot == maxy) { 1605 GoTo(top, 0); 1606 UpdateAttrs(blank); 1607 TPUTS_TRACE("parm_rindex"); 1608 tputs(tparm(parm_rindex, n, 0), n, _nc_outch); 1609 } else if (parm_insert_line && bot == maxy) { 1610 GoTo(top, 0); 1611 UpdateAttrs(blank); 1612 TPUTS_TRACE("parm_insert_line"); 1613 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1614 } else if (scroll_reverse && top == miny && bot == maxy) { 1615 GoTo(top, 0); 1616 UpdateAttrs(blank); 1617 for (i = 0; i < n; i++) { 1618 TPUTS_TRACE("scroll_reverse"); 1619 putp(scroll_reverse); 1620 } 1621 } else if (insert_line && bot == maxy) { 1622 GoTo(top, 0); 1623 UpdateAttrs(blank); 1624 for (i = 0; i < n; i++) { 1625 TPUTS_TRACE("insert_line"); 1626 putp(insert_line); 1627 } 1628 } else 1629 return ERR; 1630 1631#if NCURSES_EXT_FUNCS 1632 if (FILL_BCE()) { 1633 int j; 1634 for (i = 0; i < n; i++) { 1635 GoTo(top + i, 0); 1636 for (j = 0; j < screen_columns; j++) 1637 PutChar(CHREF(blank)); 1638 } 1639 } 1640#endif 1641 return OK; 1642} 1643 1644/* scroll by using delete_line at del and insert_line at ins */ 1645/* n > 0 */ 1646static int 1647scroll_idl(int n, int del, int ins, NCURSES_CH_T blank) 1648{ 1649 int i; 1650 1651 if (!((parm_delete_line || delete_line) && (parm_insert_line || insert_line))) 1652 return ERR; 1653 1654 GoTo(del, 0); 1655 UpdateAttrs(blank); 1656 if (n == 1 && delete_line) { 1657 TPUTS_TRACE("delete_line"); 1658 putp(delete_line); 1659 } else if (parm_delete_line) { 1660 TPUTS_TRACE("parm_delete_line"); 1661 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1662 } else { /* if (delete_line) */ 1663 for (i = 0; i < n; i++) { 1664 TPUTS_TRACE("delete_line"); 1665 putp(delete_line); 1666 } 1667 } 1668 1669 GoTo(ins, 0); 1670 UpdateAttrs(blank); 1671 if (n == 1 && insert_line) { 1672 TPUTS_TRACE("insert_line"); 1673 putp(insert_line); 1674 } else if (parm_insert_line) { 1675 TPUTS_TRACE("parm_insert_line"); 1676 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1677 } else { /* if (insert_line) */ 1678 for (i = 0; i < n; i++) { 1679 TPUTS_TRACE("insert_line"); 1680 putp(insert_line); 1681 } 1682 } 1683 1684 return OK; 1685} 1686 1687/* 1688 * Note: some terminals require the cursor to be within the scrolling margins 1689 * before setting them. Generally, the cursor must be at the appropriate end 1690 * of the scrolling margins when issuing an indexing operation (it is not 1691 * apparent whether it must also be at the left margin; we do this just to be 1692 * safe). To make the related cursor movement a little faster, we use the 1693 * save/restore cursor capabilities if the terminal has them. 1694 */ 1695NCURSES_EXPORT(int) 1696_nc_scrolln(int n, int top, int bot, int maxy) 1697/* scroll region from top to bot by n lines */ 1698{ 1699 NCURSES_CH_T blank = ClrBlank(stdscr); 1700 int i; 1701 bool cursor_saved = FALSE; 1702 int res; 1703 1704 TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy)); 1705 1706#if USE_XMC_SUPPORT 1707 /* 1708 * If we scroll, we might remove a cookie. 1709 */ 1710 if (magic_cookie_glitch > 0) { 1711 return (ERR); 1712 } 1713#endif 1714 1715 if (n > 0) { /* scroll up (forward) */ 1716 /* 1717 * Explicitly clear if stuff pushed off top of region might 1718 * be saved by the terminal. 1719 */ 1720 res = scroll_csr_forward(n, top, bot, 0, maxy, blank); 1721 1722 if (res == ERR && change_scroll_region) { 1723 if ((((n == 1 && scroll_forward) || parm_index) 1724 && (SP->_cursrow == bot || SP->_cursrow == bot - 1)) 1725 && save_cursor && restore_cursor) { 1726 cursor_saved = TRUE; 1727 TPUTS_TRACE("save_cursor"); 1728 putp(save_cursor); 1729 } 1730 TPUTS_TRACE("change_scroll_region"); 1731 putp(tparm(change_scroll_region, top, bot)); 1732 if (cursor_saved) { 1733 TPUTS_TRACE("restore_cursor"); 1734 putp(restore_cursor); 1735 } else { 1736 SP->_cursrow = SP->_curscol = -1; 1737 } 1738 1739 res = scroll_csr_forward(n, top, bot, top, bot, blank); 1740 1741 TPUTS_TRACE("change_scroll_region"); 1742 putp(tparm(change_scroll_region, 0, maxy)); 1743 SP->_cursrow = SP->_curscol = -1; 1744 } 1745 1746 if (res == ERR && _nc_idlok) 1747 res = scroll_idl(n, top, bot - n + 1, blank); 1748 1749 /* 1750 * Clear the newly shifted-in text. 1751 */ 1752 if (res != ERR 1753 && (non_dest_scroll_region || (memory_below && bot == maxy))) { 1754 NCURSES_CH_T blank2 = NewChar(BLANK_TEXT); 1755 if (bot == maxy && clr_eos) { 1756 GoTo(bot - n + 1, 0); 1757 ClrToEOS(blank2); 1758 } else { 1759 for (i = 0; i < n; i++) { 1760 GoTo(bot - i, 0); 1761 ClrToEOL(blank2, FALSE); 1762 } 1763 } 1764 } 1765 1766 } else { /* (n < 0) - scroll down (backward) */ 1767 res = scroll_csr_backward(-n, top, bot, 0, maxy, blank); 1768 1769 if (res == ERR && change_scroll_region) { 1770 if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top - 1) 1771 && save_cursor && restore_cursor) { 1772 cursor_saved = TRUE; 1773 TPUTS_TRACE("save_cursor"); 1774 putp(save_cursor); 1775 } 1776 TPUTS_TRACE("change_scroll_region"); 1777 putp(tparm(change_scroll_region, top, bot)); 1778 if (cursor_saved) { 1779 TPUTS_TRACE("restore_cursor"); 1780 putp(restore_cursor); 1781 } else { 1782 SP->_cursrow = SP->_curscol = -1; 1783 } 1784 1785 res = scroll_csr_backward(-n, top, bot, top, bot, blank); 1786 1787 TPUTS_TRACE("change_scroll_region"); 1788 putp(tparm(change_scroll_region, 0, maxy)); 1789 SP->_cursrow = SP->_curscol = -1; 1790 } 1791 1792 if (res == ERR && _nc_idlok) 1793 res = scroll_idl(-n, bot + n + 1, top, blank); 1794 1795 /* 1796 * Clear the newly shifted-in text. 1797 */ 1798 if (res != ERR 1799 && (non_dest_scroll_region || (memory_above && top == 0))) { 1800 NCURSES_CH_T blank2 = NewChar(BLANK_TEXT); 1801 for (i = 0; i < -n; i++) { 1802 GoTo(i + top, 0); 1803 ClrToEOL(blank2, FALSE); 1804 } 1805 } 1806 } 1807 1808 if (res == ERR) 1809 return (ERR); 1810 1811 _nc_scroll_window(curscr, n, top, bot, blank); 1812 1813 /* shift hash values too - they can be reused */ 1814 _nc_scroll_oldhash(n, top, bot); 1815 1816 return (OK); 1817} 1818 1819NCURSES_EXPORT(void) 1820_nc_screen_resume(void) 1821{ 1822 /* make sure terminal is in a sane known state */ 1823 SetAttr(SCREEN_ATTRS(SP), A_NORMAL); 1824 newscr->_clear = TRUE; 1825 1826 /* reset color pairs and definitions */ 1827 if (SP->_coloron || SP->_color_defs) 1828 _nc_reset_colors(); 1829 1830 /* restore user-defined colors, if any */ 1831 if (SP->_color_defs < 0) { 1832 int n; 1833 SP->_color_defs = -(SP->_color_defs); 1834 for (n = 0; n < SP->_color_defs; ++n) { 1835 if (SP->_color_table[n].init) { 1836 init_color(n, 1837 SP->_color_table[n].r, 1838 SP->_color_table[n].g, 1839 SP->_color_table[n].b); 1840 } 1841 } 1842 } 1843 1844 if (exit_attribute_mode) 1845 putp(exit_attribute_mode); 1846 else { 1847 /* turn off attributes */ 1848 if (exit_alt_charset_mode) 1849 putp(exit_alt_charset_mode); 1850 if (exit_standout_mode) 1851 putp(exit_standout_mode); 1852 if (exit_underline_mode) 1853 putp(exit_underline_mode); 1854 } 1855 if (exit_insert_mode) 1856 putp(exit_insert_mode); 1857 if (enter_am_mode && exit_am_mode) 1858 putp(auto_right_margin ? enter_am_mode : exit_am_mode); 1859} 1860 1861NCURSES_EXPORT(void) 1862_nc_screen_init(void) 1863{ 1864 _nc_screen_resume(); 1865} 1866 1867/* wrap up screen handling */ 1868NCURSES_EXPORT(void) 1869_nc_screen_wrap(void) 1870{ 1871 UpdateAttrs(normal); 1872#if NCURSES_EXT_FUNCS 1873 if (SP->_coloron 1874 && !SP->_default_color) { 1875 NCURSES_CH_T blank = NewChar(BLANK_TEXT); 1876 SP->_default_color = TRUE; 1877 _nc_do_color(-1, 0, FALSE, _nc_outch); 1878 SP->_default_color = FALSE; 1879 1880 mvcur(SP->_cursrow, SP->_curscol, screen_lines - 1, 0); 1881 1882 ClrToEOL(blank, TRUE); 1883 } 1884#endif 1885 if (SP->_color_defs) { 1886 _nc_reset_colors(); 1887 } 1888} 1889 1890#if USE_XMC_SUPPORT 1891NCURSES_EXPORT(void) 1892_nc_do_xmc_glitch(attr_t previous) 1893{ 1894 attr_t chg = XMC_CHANGES(previous ^ AttrOf(SCREEN_ATTRS(SP))); 1895 1896 while (chg != 0) { 1897 if (chg & 1) { 1898 SP->_curscol += magic_cookie_glitch; 1899 if (SP->_curscol >= SP->_columns) 1900 wrap_cursor(); 1901 TR(TRACE_UPDATE, ("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol)); 1902 } 1903 chg >>= 1; 1904 } 1905} 1906#endif /* USE_XMC_SUPPORT */ 1907