tty_update.c revision 56639
1/**************************************************************************** 2 * Copyright (c) 1998 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 ****************************************************************************/ 33 34 35/*----------------------------------------------------------------- 36 * 37 * lib_doupdate.c 38 * 39 * The routine doupdate() and its dependents. Also _nc_outstr(), 40 * so all physical output is concentrated here (except _nc_outch() 41 * in lib_tputs.c). 42 * 43 *-----------------------------------------------------------------*/ 44 45#ifdef __BEOS__ 46#include <OS.h> 47#endif 48 49#include <curses.priv.h> 50 51#if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES 52#define USE_TRACE_TIMES 1 53#else 54#define USE_TRACE_TIMES 0 55#endif 56 57#if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT 58#include <sys/time.h> 59#endif 60 61#if USE_TRACE_TIMES 62#include <sys/times.h> 63#endif 64 65#if USE_FUNC_POLL 66#include <stropts.h> 67#include <poll.h> 68#elif HAVE_SELECT 69#if HAVE_SYS_SELECT_H 70#include <sys/select.h> 71#endif 72#endif 73 74#include <term.h> 75 76MODULE_ID("$Id: tty_update.c,v 1.117 1999/10/22 23:28:46 tom Exp $") 77 78/* 79 * This define controls the line-breakout optimization. Every once in a 80 * while during screen refresh, we want to check for input and abort the 81 * update if there's some waiting. CHECK_INTERVAL controls the number of 82 * changed lines to be emitted between input checks. 83 * 84 * Note: Input-check-and-abort is no longer done if the screen is being 85 * updated from scratch. This is a feature, not a bug. 86 */ 87#define CHECK_INTERVAL 5 88 89/* 90 * Enable checking to see if doupdate and friends are tracking the true 91 * cursor position correctly. NOTE: this is a debugging hack which will 92 * work ONLY on ANSI-compatible terminals! 93 */ 94/* #define POSITION_DEBUG */ 95 96static inline chtype ClrBlank ( WINDOW *win ); 97static int ClrBottom(int total); 98static void ClearScreen( chtype blank ); 99static void ClrUpdate( void ); 100static void DelChar( int count ); 101static void InsStr( chtype *line, int count ); 102static void TransformLine( int const lineno ); 103 104#ifdef POSITION_DEBUG 105/**************************************************************************** 106 * 107 * Debugging code. Only works on ANSI-standard terminals. 108 * 109 ****************************************************************************/ 110 111static void position_check(int expected_y, int expected_x, char *legend) 112/* check to see if the real cursor position matches the virtual */ 113{ 114 char buf[20]; 115 int y, x; 116 117 if (!_nc_tracing || (expected_y < 0 && expected_x < 0)) 118 return; 119 120 memset(buf, '\0', sizeof(buf)); 121 putp("\033[6n"); /* only works on ANSI-compatibles */ 122 _nc_flush(); 123 (void) read(0, buf, sizeof(buf)-1); 124 _tracef("probe returned %s", _nc_visbuf(buf)); 125 126 /* try to interpret as a position report */ 127 if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) { 128 _tracef("position probe failed in %s", legend); 129 } else { 130 if (expected_x < 0) 131 expected_x = x - 1; 132 if (expected_y < 0) 133 expected_y = y - 1; 134 if (y - 1 != expected_y || x - 1 != expected_x) { 135 beep(); 136 _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s", 137 y-1, x-1, expected_y, expected_x, legend); 138 } else { 139 _tracef("position matches OK in %s", legend); 140 } 141 } 142} 143#else 144#define position_check(expected_y, expected_x, legend) /* nothing */ 145#endif /* POSITION_DEBUG */ 146 147/**************************************************************************** 148 * 149 * Optimized update code 150 * 151 ****************************************************************************/ 152 153static inline void GoTo(int const row, int const col) 154{ 155 chtype oldattr = SP->_current_attr; 156 157 TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)", 158 row, col, SP->_cursrow, SP->_curscol)); 159 160 position_check(SP->_cursrow, SP->_curscol, "GoTo"); 161 162 /* 163 * Force restore even if msgr is on when we're in an alternate 164 * character set -- these have a strong tendency to screw up the 165 * CR & LF used for local character motions! 166 */ 167 if ((oldattr & A_ALTCHARSET) 168 || (oldattr && !move_standout_mode)) 169 { 170 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move", 171 oldattr, _traceattr(oldattr))); 172 vidattr(A_NORMAL); 173 } 174 175 mvcur(SP->_cursrow, SP->_curscol, row, col); 176 SP->_cursrow = row; 177 SP->_curscol = col; 178 position_check(SP->_cursrow, SP->_curscol, "GoTo2"); 179} 180 181static inline void PutAttrChar(chtype ch) 182{ 183 if (tilde_glitch && (TextOf(ch) == '~')) 184 ch = ('`' | AttrOf(ch)); 185 186 TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)", 187 _tracechtype(ch), 188 SP->_cursrow, SP->_curscol)); 189 UpdateAttrs(ch); 190 if (SP->_cleanup) { 191 _nc_outch((int)TextOf(ch)); 192 } else { 193 putc((int)TextOf(ch), SP->_ofp); /* macro's fastest... */ 194#ifdef TRACE 195 _nc_outchars++; 196#endif /* TRACE */ 197 } 198 SP->_curscol++; 199 if (char_padding) { 200 TPUTS_TRACE("char_padding"); 201 putp(char_padding); 202 } 203} 204 205static bool check_pending(void) 206/* check for pending input */ 207{ 208 bool have_pending = FALSE; 209 210 /* 211 * Only carry out this check when the flag is zero, otherwise we'll 212 * have the refreshing slow down drastically (or stop) if there's an 213 * unread character available. 214 */ 215 if(SP->_fifohold != 0) 216 return FALSE; 217 218 if (SP->_checkfd >= 0) { 219#if USE_FUNC_POLL 220 struct pollfd fds[1]; 221 fds[0].fd = SP->_checkfd; 222 fds[0].events = POLLIN; 223 if (poll(fds, 1, 0) > 0) 224 { 225 have_pending = TRUE; 226 } 227#elif defined(__BEOS__) 228 /* 229 * BeOS's select() is declared in socket.h, so the configure script does 230 * not see it. That's just as well, since that function works only for 231 * sockets. This (using snooze and ioctl) was distilled from Be's patch 232 * for ncurses which uses a separate thread to simulate select(). 233 * 234 * FIXME: the return values from the ioctl aren't very clear if we get 235 * interrupted. 236 */ 237 int n = 0; 238 int howmany = ioctl(0, 'ichr', &n); 239 if (howmany >= 0 && n > 0) { 240 have_pending = TRUE; 241 } 242#elif HAVE_SELECT 243 fd_set fdset; 244 struct timeval ktimeout; 245 246 ktimeout.tv_sec = 247 ktimeout.tv_usec = 0; 248 249 FD_ZERO(&fdset); 250 FD_SET(SP->_checkfd, &fdset); 251 if (select(SP->_checkfd+1, &fdset, NULL, NULL, &ktimeout) != 0) 252 { 253 have_pending = TRUE; 254 } 255#endif 256 } 257 if (have_pending) { 258 SP->_fifohold = 5; 259 _nc_flush(); 260 } 261 return FALSE; 262} 263 264/* 265 * No one supports recursive inline functions. However, gcc is quieter if we 266 * instantiate the recursive part separately. 267 */ 268#if CC_HAS_INLINE_FUNCS 269static void callPutChar(chtype const); 270#else 271#define callPutChar(ch) PutChar(ch) 272#endif 273 274static inline void PutChar(chtype const ch); /* forward declaration */ 275 276/* put char at lower right corner */ 277static void PutCharLR(chtype const ch) 278{ 279 if (!auto_right_margin) 280 { 281 /* we can put the char directly */ 282 PutAttrChar(ch); 283 } 284 else if (enter_am_mode && exit_am_mode) 285 { 286 /* we can suppress automargin */ 287 TPUTS_TRACE("exit_am_mode"); 288 putp(exit_am_mode); 289 290 PutAttrChar(ch); 291 SP->_curscol--; 292 position_check(SP->_cursrow, SP->_curscol, "exit_am_mode"); 293 294 TPUTS_TRACE("enter_am_mode"); 295 putp(enter_am_mode); 296 } 297 else if ((enter_insert_mode && exit_insert_mode) 298 || insert_character || parm_ich) 299 { 300 GoTo(screen_lines-1,screen_columns-2); 301 callPutChar(ch); 302 GoTo(screen_lines-1,screen_columns-2); 303 InsStr(newscr->_line[screen_lines-1].text+screen_columns-2,1); 304 } 305} 306 307static void wrap_cursor(void) 308{ 309 if (eat_newline_glitch) 310 { 311 /* 312 * xenl can manifest two different ways. The vt100 313 * way is that, when you'd expect the cursor to wrap, 314 * it stays hung at the right margin (on top of the 315 * character just emitted) and doesn't wrap until the 316 * *next* graphic char is emitted. The c100 way is 317 * to ignore LF received just after an am wrap. 318 * 319 * An aggressive way to handle this would be to 320 * emit CR/LF after the char and then assume the wrap 321 * is done, you're on the first position of the next 322 * line, and the terminal out of its weird state. 323 * Here it's safe to just tell the code that the 324 * cursor is in hyperspace and let the next mvcur() 325 * call straighten things out. 326 */ 327 SP->_curscol = -1; 328 SP->_cursrow = -1; 329 } 330 else if (auto_right_margin) 331 { 332 SP->_curscol = 0; 333 SP->_cursrow++; 334 } 335 else 336 { 337 SP->_curscol--; 338 } 339 position_check(SP->_cursrow, SP->_curscol, "wrap_cursor"); 340} 341 342static inline void PutChar(chtype const ch) 343/* insert character, handling automargin stuff */ 344{ 345 if (SP->_cursrow == screen_lines-1 && SP->_curscol == screen_columns-1) 346 PutCharLR(ch); 347 else 348 PutAttrChar(ch); 349 350 if (SP->_curscol >= screen_columns) 351 wrap_cursor(); 352 353 position_check(SP->_cursrow, SP->_curscol, "PutChar"); 354} 355 356/* 357 * Issue a given span of characters from an array. 358 * Must be functionally equivalent to: 359 * for (i = 0; i < num; i++) 360 * PutChar(ntext[i]); 361 * but can leave the cursor positioned at the middle of the interval. 362 * 363 * Returns: 0 - cursor is at the end of interval 364 * 1 - cursor is somewhere in the middle 365 * 366 * This code is optimized using ech and rep. 367 */ 368static int EmitRange(const chtype *ntext, int num) 369{ 370 int i; 371 372 if (erase_chars || repeat_char) 373 { 374 while (num > 0) 375 { 376 int runcount; 377 chtype ntext0; 378 379 while (num>1 && ntext[0]!=ntext[1]) 380 { 381 PutChar(ntext[0]); 382 ntext++; 383 num--; 384 } 385 ntext0 = ntext[0]; 386 if (num==1) 387 { 388 PutChar(ntext0); 389 return 0; 390 } 391 runcount = 2; 392 393 while (runcount < num && ntext[runcount] == ntext0) 394 runcount++; 395 396 /* 397 * The cost expression in the middle isn't exactly right. 398 * _cup_cost is an upper bound on the cost for moving to the 399 * end of the erased area, but not the cost itself (which we 400 * can't compute without emitting the move). This may result 401 * in erase_chars not getting used in some situations for 402 * which it would be marginally advantageous. 403 */ 404 if (erase_chars 405 && runcount > SP->_ech_cost + SP->_cup_cost 406 && can_clear_with(ntext0)) 407 { 408 UpdateAttrs(ntext0); 409 putp(tparm(erase_chars, runcount)); 410 411 /* 412 * If this is the last part of the given interval, 413 * don't bother moving cursor, since it can be the 414 * last update on the line. 415 */ 416 if (runcount < num) 417 GoTo(SP->_cursrow, SP->_curscol + runcount); 418 else 419 return 1; /* cursor stays in the middle */ 420 } 421 else if (repeat_char && runcount > SP->_rep_cost) 422 { 423 bool wrap_possible = (SP->_curscol + runcount >= screen_columns); 424 int rep_count = runcount; 425 426 if (wrap_possible) 427 rep_count--; 428 429 UpdateAttrs(ntext0); 430 putp(tparm(repeat_char, TextOf(ntext0), rep_count)); 431 SP->_curscol += rep_count; 432 433 if (wrap_possible) 434 PutChar(ntext0); 435 } 436 else 437 { 438 for (i = 0; i < runcount; i++) 439 PutChar(ntext[i]); 440 } 441 ntext += runcount; 442 num -= runcount; 443 } 444 return 0; 445 } 446 447 for (i = 0; i < num; i++) 448 PutChar(ntext[i]); 449 return 0; 450} 451 452/* 453 * Output the line in the given range [first .. last] 454 * 455 * If there's a run of identical characters that's long enough to justify 456 * cursor movement, use that also. 457 * 458 * Returns: same as EmitRange 459 */ 460static int PutRange( 461 const chtype *otext, 462 const chtype *ntext, 463 int row, 464 int first, int last) 465{ 466 int j, run; 467 int cost = min(SP->_cup_ch_cost, SP->_hpa_ch_cost); 468 469 TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)", 470 otext, ntext, row, first, last)); 471 472 if (otext != ntext 473 && (last-first+1) > cost) { 474 for (j = first, run = 0; j <= last; j++) { 475 if (otext[j] == ntext[j]) { 476 run++; 477 } else { 478 if (run > cost) { 479 int before_run = (j - run); 480 EmitRange(ntext+first, before_run-first); 481 GoTo(row, first = j); 482 } 483 run = 0; 484 } 485 } 486 } 487 return EmitRange(ntext + first, last-first+1); 488} 489 490#if CC_HAS_INLINE_FUNCS 491static void callPutChar(chtype const ch) 492{ 493 PutChar(ch); 494} 495#endif 496 497#define MARK_NOCHANGE(win,row) \ 498 { \ 499 win->_line[row].firstchar = _NOCHANGE; \ 500 win->_line[row].lastchar = _NOCHANGE; \ 501 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row); \ 502 } 503 504int doupdate(void) 505{ 506int i; 507int nonempty; 508#if USE_TRACE_TIMES 509struct tms before, after; 510#endif /* USE_TRACE_TIMES */ 511 512 T((T_CALLED("doupdate()"))); 513 514#ifdef TRACE 515 if (_nc_tracing & TRACE_UPDATE) 516 { 517 if (curscr->_clear) 518 _tracef("curscr is clear"); 519 else 520 _tracedump("curscr", curscr); 521 _tracedump("newscr", newscr); 522 } 523#endif /* TRACE */ 524 525 _nc_signal_handler(FALSE); 526 527 if (SP->_fifohold) 528 SP->_fifohold--; 529 530#if USE_SIZECHANGE 531 if (SP->_endwin || SP->_sig_winch) 532 { 533 /* 534 * This is a transparent extension: XSI does not address it, 535 * and applications need not know that ncurses can do it. 536 * 537 * Check if the terminal size has changed while curses was off 538 * (this can happen in an xterm, for example), and resize the 539 * ncurses data structures accordingly. 540 */ 541 _nc_update_screensize(); 542 } 543#endif 544 545 if (SP->_endwin) { 546 547 T(("coming back from shell mode")); 548 reset_prog_mode(); 549 550 _nc_mvcur_resume(); 551 _nc_screen_resume(); 552 SP->_mouse_resume(SP); 553 554 SP->_endwin = FALSE; 555 } 556 557#if USE_TRACE_TIMES 558 /* zero the metering machinery */ 559 _nc_outchars = 0; 560 (void) times(&before); 561#endif /* USE_TRACE_TIMES */ 562 563 /* 564 * This is the support for magic-cookie terminals. The 565 * theory: we scan the virtual screen looking for attribute 566 * turnons. Where we find one, check to make sure it's 567 * realizable by seeing if the required number of 568 * un-attributed blanks are present before and after the 569 * attributed range; try to shift the range boundaries over 570 * blanks (not changing the screen display) so this becomes 571 * true. If it is, shift the beginning attribute change 572 * appropriately (the end one, if we've gotten this far, is 573 * guaranteed room for its cookie). If not, nuke the added 574 * attributes out of the span. 575 */ 576#if USE_XMC_SUPPORT 577 if (magic_cookie_glitch > 0) { 578 int j, k; 579 attr_t rattr = A_NORMAL; 580 581 for (i = 0; i < screen_lines; i++) 582 for (j = 0; j < screen_columns; j++) 583 { 584 bool failed = FALSE; 585 chtype turnon = AttrOf(newscr->_line[i].text[j]) & ~rattr; 586 587 /* is an attribute turned on here? */ 588 if (turnon == 0) { 589 rattr = AttrOf(newscr->_line[i].text[j]); 590 continue; 591 } 592 593 T(("At (%d, %d): from %s...", i, j, _traceattr(rattr))); 594 T(("...to %s",_traceattr(turnon))); 595 596 /* 597 * If the attribute change location is a blank with a 598 * "safe" attribute, undo the attribute turnon. This may 599 * ensure there's enough room to set the attribute before 600 * the first non-blank in the run. 601 */ 602#define SAFE(a) !((a) & (chtype)~NONBLANK_ATTR) 603 if (TextOf(newscr->_line[i].text[j])==' ' && SAFE(turnon)) 604 { 605 newscr->_line[i].text[j] &= ~turnon; 606 continue; 607 } 608 609 /* check that there's enough room at start of span */ 610 for (k = 1; k <= magic_cookie_glitch; k++) 611 if (j-k < 0 612 || TextOf(newscr->_line[i].text[j-k]) != ' ' 613 || !SAFE(AttrOf(newscr->_line[i].text[j-k]))) 614 failed = TRUE; 615 if (!failed) 616 { 617 bool end_onscreen = FALSE; 618 int m, n = j; 619 620 /* find end of span, if it's onscreen */ 621 for (m = i; m < screen_lines; m++) 622 { 623 for ( ; n < screen_columns; n++) 624 { 625 if (AttrOf(newscr->_line[m].text[n]) == rattr) 626 { 627 end_onscreen = TRUE; 628 T(("Range attributed with %s ends at (%d, %d)", 629 _traceattr(turnon),m,n)); 630 goto foundit; 631 } 632 } 633 n = 0; 634 } 635 T(("Range attributed with %s ends offscreen", 636 _traceattr(turnon))); 637 foundit:; 638 639 if (end_onscreen) 640 { 641 chtype *lastline = newscr->_line[m].text; 642 643 /* 644 * If there are safely-attributed blanks at the 645 * end of the range, shorten the range. This will 646 * help ensure that there is enough room at end 647 * of span. 648 */ 649 while (n >= 0 650 && TextOf(lastline[n]) == ' ' 651 && SAFE(AttrOf(lastline[n]))) 652 lastline[n--] &= ~turnon; 653 654 /* check that there's enough room at end of span */ 655 for (k = 1; k <= magic_cookie_glitch; k++) 656 if (n + k >= screen_columns 657 || TextOf(lastline[n + k]) != ' ' 658 || !SAFE(AttrOf(lastline[n+k]))) 659 failed = TRUE; 660 } 661 } 662 663 if (failed) 664 { 665 int p, q = j; 666 667 T(("Clearing %s beginning at (%d, %d)", 668 _traceattr(turnon), i, j)); 669 670 /* turn off new attributes over span */ 671 for (p = i; p < screen_lines; p++) 672 { 673 for ( ; q < screen_columns; q++) 674 { 675 if (AttrOf(newscr->_line[p].text[q]) == rattr) 676 goto foundend; 677 newscr->_line[p].text[q] &= ~turnon; 678 } 679 q = 0; 680 } 681 foundend:; 682 } 683 else 684 { 685 T(("Cookie space for %s found before (%d, %d)", 686 _traceattr(turnon), i, j)); 687 688 /* 689 * back up the start of range so there's room 690 * for cookies before the first nonblank character 691 */ 692 for (k = 1; k <= magic_cookie_glitch; k++) 693 newscr->_line[i].text[j-k] |= turnon; 694 } 695 696 rattr = AttrOf(newscr->_line[i].text[j]); 697 } 698 699#ifdef TRACE 700 /* show altered highlights after magic-cookie check */ 701 if (_nc_tracing & TRACE_UPDATE) 702 { 703 _tracef("After magic-cookie check..."); 704 _tracedump("newscr", newscr); 705 } 706#endif /* TRACE */ 707 } 708#endif /* USE_XMC_SUPPORT */ 709 710 nonempty = 0; 711 if (curscr->_clear || newscr->_clear) { /* force refresh ? */ 712 T(("clearing and updating from scratch")); 713 ClrUpdate(); 714 curscr->_clear = FALSE; /* reset flag */ 715 newscr->_clear = FALSE; /* reset flag */ 716 } else { 717 int changedlines = CHECK_INTERVAL; 718 719 if(check_pending()) 720 goto cleanup; 721 722 nonempty = min(screen_lines, newscr->_maxy+1); 723 724 if (SP->_scrolling) { 725 _nc_scroll_optimize(); 726 } 727 728 nonempty = ClrBottom(nonempty); 729 730 T(("Transforming lines, nonempty %d", nonempty)); 731 for (i = 0; i < nonempty; i++) { 732 /* 733 * Here is our line-breakout optimization. 734 */ 735 if (changedlines == CHECK_INTERVAL) 736 { 737 if (check_pending()) 738 goto cleanup; 739 changedlines = 0; 740 } 741 742 /* 743 * newscr->line[i].firstchar is normally set 744 * by wnoutrefresh. curscr->line[i].firstchar 745 * is normally set by _nc_scroll_window in the 746 * vertical-movement optimization code, 747 */ 748 if (newscr->_line[i].firstchar != _NOCHANGE 749 || curscr->_line[i].firstchar != _NOCHANGE) 750 { 751 TransformLine(i); 752 changedlines++; 753 } 754 755 /* mark line changed successfully */ 756 if (i <= newscr->_maxy) 757 MARK_NOCHANGE(newscr,i) 758 if (i <= curscr->_maxy) 759 MARK_NOCHANGE(curscr,i) 760 } 761 } 762 763 /* put everything back in sync */ 764 for (i = nonempty; i <= newscr->_maxy; i++) 765 MARK_NOCHANGE(newscr,i) 766 for (i = nonempty; i <= curscr->_maxy; i++) 767 MARK_NOCHANGE(curscr,i) 768 769 if (!newscr->_leaveok) 770 { 771 curscr->_curx = newscr->_curx; 772 curscr->_cury = newscr->_cury; 773 774 GoTo(curscr->_cury, curscr->_curx); 775 } 776 777 cleanup: 778 /* 779 * Keep the physical screen in normal mode in case we get other 780 * processes writing to the screen. 781 */ 782 UpdateAttrs(A_NORMAL); 783 784 _nc_flush(); 785 curscr->_attrs = newscr->_attrs; 786/* curscr->_bkgd = newscr->_bkgd; */ 787 788#if USE_TRACE_TIMES 789 (void) times(&after); 790 TR(TRACE_TIMES, ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time", 791 _nc_outchars, 792 after.tms_stime-before.tms_stime, 793 after.tms_utime-before.tms_utime)); 794#endif /* USE_TRACE_TIMES */ 795 796 _nc_signal_handler(TRUE); 797 798 returnCode(OK); 799} 800 801/* 802 * ClrBlank(win) 803 * 804 * Returns the attributed character that corresponds to the "cleared" 805 * screen. If the terminal has the back-color-erase feature, this will be 806 * colored according to the wbkgd() call. 807 * 808 * We treat 'curscr' specially because it isn't supposed to be set directly 809 * in the wbkgd() call. Assume 'stdscr' for this case. 810 */ 811#define BCE_ATTRS (A_NORMAL|A_COLOR) 812#define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_bkgd) 813 814static inline chtype ClrBlank (WINDOW *win) 815{ 816chtype blank = BLANK; 817 if (back_color_erase) 818 blank |= (BCE_BKGD(win) & BCE_ATTRS); 819 return blank; 820} 821 822/* 823** ClrUpdate() 824** 825** Update by clearing and redrawing the entire screen. 826** 827*/ 828 829static void ClrUpdate(void) 830{ 831 int i; 832 chtype blank = ClrBlank(stdscr); 833 int nonempty = min(screen_lines, newscr->_maxy+1); 834 835 T(("ClrUpdate() called")); 836 837 ClearScreen(blank); 838 839 T(("updating screen from scratch")); 840 841 nonempty = ClrBottom(nonempty); 842 843 for (i = 0; i < nonempty; i++) 844 TransformLine(i); 845} 846 847/* 848** ClrToEOL(blank) 849** 850** Clear to end of current line, starting at the cursor position 851*/ 852 853static void ClrToEOL(chtype blank) 854{ 855int j; 856bool needclear = FALSE; 857 858 for (j = SP->_curscol; j < screen_columns; j++) 859 { 860 chtype *cp = &(curscr->_line[SP->_cursrow].text[j]); 861 862 if (*cp != blank) 863 { 864 *cp = blank; 865 needclear = TRUE; 866 } 867 } 868 869 if (needclear) 870 { 871 UpdateAttrs(blank); 872 TPUTS_TRACE("clr_eol"); 873 if (SP->_el_cost > (screen_columns - SP->_curscol)) 874 { 875 int count = (screen_columns - SP->_curscol); 876 while (count-- > 0) 877 PutChar(blank); 878 } 879 else 880 putp(clr_eol); 881 } 882} 883 884/* 885** ClrToEOS(blank) 886** 887** Clear to end of screen, starting at the cursor position 888*/ 889 890static void ClrToEOS(chtype blank) 891{ 892int row, col; 893 894 UpdateAttrs(blank); 895 TPUTS_TRACE("clr_eos"); 896 row = SP->_cursrow; 897 tputs(clr_eos, screen_lines-row, _nc_outch); 898 899 for (col = SP->_curscol; col < screen_columns; col++) 900 curscr->_line[row].text[col] = blank; 901 902 for (row++; row < screen_lines; row++) 903 { 904 for (col = 0; col < screen_columns; col++) 905 curscr->_line[row].text[col] = blank; 906 } 907} 908 909/* 910 * ClrBottom(total) 911 * 912 * Test if clearing the end of the screen would satisfy part of the 913 * screen-update. Do this by scanning backwards through the lines in the 914 * screen, checking if each is blank, and one or more are changed. 915 */ 916static int ClrBottom(int total) 917{ 918static chtype *tstLine; 919static size_t lenLine; 920 921int row, col; 922int top = total; 923int last = min(screen_columns, newscr->_maxx+1); 924size_t length = sizeof(chtype) * last; 925chtype blank = newscr->_line[total-1].text[last-1]; /* lower right char */ 926 927 if(!clr_eos || !can_clear_with(blank)) 928 return total; 929 930 if ((tstLine == 0) || (last > (int)lenLine)) { 931 tstLine = typeRealloc(chtype, last, tstLine); 932 if (tstLine != 0) { 933 lenLine = last; 934 for (col = 0; col < last; col++) 935 tstLine[col] = blank; 936 } 937 } 938 939 if (tstLine != 0) { 940 for (row = total-1; row >= 0; row--) { 941 if (memcmp(tstLine, newscr->_line[row].text, length)) 942 break; 943 if (memcmp(tstLine, curscr->_line[row].text, length)) 944 top = row; 945 } 946 947 /* don't use clr_eos for just one line if clr_eol available */ 948 if (top < total-1 || (top < total && !clr_eol && !clr_bol)) { 949 GoTo(top,0); 950 ClrToEOS(blank); 951 total = top; 952 if (SP->oldhash && SP->newhash) 953 { 954 for (row = top; row < screen_lines; row++) 955 SP->oldhash[row] = SP->newhash[row]; 956 } 957 } 958 } 959#if NO_LEAKS 960 if (tstLine != 0) 961 FreeAndNull(tstLine); 962#endif 963 return total; 964} 965 966 967/* 968** TransformLine(lineno) 969** 970** Transform the given line in curscr to the one in newscr, using 971** Insert/Delete Character if _nc_idcok && has_ic(). 972** 973** firstChar = position of first different character in line 974** oLastChar = position of last different character in old line 975** nLastChar = position of last different character in new line 976** 977** move to firstChar 978** overwrite chars up to min(oLastChar, nLastChar) 979** if oLastChar < nLastChar 980** insert newLine[oLastChar+1..nLastChar] 981** else 982** delete oLastChar - nLastChar spaces 983*/ 984 985static void TransformLine(int const lineno) 986{ 987int firstChar, oLastChar, nLastChar; 988chtype *newLine = newscr->_line[lineno].text; 989chtype *oldLine = curscr->_line[lineno].text; 990int n; 991bool attrchanged = FALSE; 992 993 T(("TransformLine(%d) called", lineno)); 994 995 /* copy new hash value to old one */ 996 if (SP->oldhash && SP->newhash) 997 SP->oldhash[lineno] = SP->newhash[lineno]; 998 999 if(ceol_standout_glitch && clr_eol) { 1000 firstChar = 0; 1001 while(firstChar < screen_columns) { 1002 if(AttrOf(newLine[firstChar]) != AttrOf(oldLine[firstChar])) 1003 attrchanged = TRUE; 1004 firstChar++; 1005 } 1006 } 1007 1008 firstChar = 0; 1009 1010 if (attrchanged) { /* we may have to disregard the whole line */ 1011 GoTo(lineno, firstChar); 1012 ClrToEOL(ClrBlank(curscr)); 1013 PutRange(oldLine, newLine, lineno, 0, (screen_columns-1)); 1014#if USE_XMC_SUPPORT 1015 1016#define NEW(r,c) newscr->_line[r].text[c] 1017#define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0) 1018#define xmc_turn_off(a,b) xmc_turn_on(b,a) 1019 1020 /* 1021 * This is a very simple loop to paint characters which may have the 1022 * magic cookie glitch embedded. It doesn't know much about video 1023 * attributes which are continued from one line to the next. It 1024 * assumes that we have filtered out requests for attribute changes 1025 * that do not get mapped to blank positions. 1026 * 1027 * FIXME: we are not keeping track of where we put the cookies, so this 1028 * will work properly only once, since we may overwrite a cookie in a 1029 * following operation. 1030 */ 1031 } else if (magic_cookie_glitch > 0) { 1032 GoTo(lineno, firstChar); 1033 for (n = 0; n < screen_columns; n++) { 1034 int m = n + magic_cookie_glitch; 1035 1036 /* check for turn-on: 1037 * If we are writing an attributed blank, where the 1038 * previous cell is not attributed. 1039 */ 1040 if (TextOf(newLine[n]) == ' ' 1041 && ((n > 0 1042 && xmc_turn_on(newLine[n-1], newLine[n])) 1043 || (n == 0 1044 && lineno > 0 1045 && xmc_turn_on(NEW(lineno-1,screen_columns-1), newLine[n])))) { 1046 n = m; 1047 } 1048 1049 PutChar(newLine[n]); 1050 1051 /* check for turn-off: 1052 * If we are writing an attributed non-blank, where the 1053 * next cell is blank, and not attributed. 1054 */ 1055 if (TextOf(newLine[n]) != ' ' 1056 && ((n+1 < screen_columns 1057 && xmc_turn_off(newLine[n], newLine[n+1])) 1058 || (n+1 >= screen_columns 1059 && lineno+1 < screen_lines 1060 && xmc_turn_off(newLine[n], NEW(lineno+1,0))))) { 1061 n = m; 1062 } 1063 1064 } 1065#undef NEW 1066#endif 1067 } else { 1068 chtype blank; 1069 1070 /* find the first differing character */ 1071 while (firstChar < screen_columns && 1072 newLine[firstChar] == oldLine[firstChar]) 1073 firstChar++; 1074 1075 /* if there wasn't one, we're done */ 1076 if (firstChar >= screen_columns) 1077 return; 1078 1079 /* it may be cheap to clear leading whitespace with clr_bol */ 1080 if (clr_bol && can_clear_with(blank=newLine[0])) 1081 { 1082 int oFirstChar, nFirstChar; 1083 1084 for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++) 1085 if (oldLine[oFirstChar] != blank) 1086 break; 1087 for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++) 1088 if (newLine[nFirstChar] != blank) 1089 break; 1090 1091 if (nFirstChar > oFirstChar + SP->_el1_cost) 1092 { 1093 if (nFirstChar >= screen_columns && SP->_el_cost <= SP->_el1_cost) 1094 { 1095 GoTo(lineno, 0); 1096 UpdateAttrs(blank); 1097 TPUTS_TRACE("clr_eol"); 1098 putp(clr_eol); 1099 } 1100 else 1101 { 1102 GoTo(lineno, nFirstChar - 1); 1103 UpdateAttrs(blank); 1104 TPUTS_TRACE("clr_bol"); 1105 putp(clr_bol); 1106 } 1107 1108 while (firstChar < nFirstChar) 1109 oldLine[firstChar++] = blank; 1110 1111 if (firstChar >= screen_columns) 1112 return; 1113 } 1114 } 1115 1116 blank = newLine[screen_columns-1]; 1117 1118 if(!can_clear_with(blank)) 1119 { 1120 /* find the last differing character */ 1121 nLastChar = screen_columns - 1; 1122 1123 while (nLastChar > firstChar 1124 && newLine[nLastChar] == oldLine[nLastChar]) 1125 nLastChar--; 1126 1127 if (nLastChar >= firstChar) { 1128 GoTo(lineno, firstChar); 1129 PutRange(oldLine, newLine, lineno, firstChar, nLastChar); 1130 memcpy( oldLine + firstChar, 1131 newLine + firstChar, 1132 (nLastChar - firstChar + 1) * sizeof(chtype)); 1133 } 1134 return; 1135 } 1136 1137 /* find last non-blank character on old line */ 1138 oLastChar = screen_columns - 1; 1139 while (oLastChar > firstChar && oldLine[oLastChar] == blank) 1140 oLastChar--; 1141 1142 /* find last non-blank character on new line */ 1143 nLastChar = screen_columns - 1; 1144 while (nLastChar > firstChar && newLine[nLastChar] == blank) 1145 nLastChar--; 1146 1147 if((nLastChar == firstChar) 1148 && (SP->_el_cost < (oLastChar - nLastChar))) { 1149 GoTo(lineno, firstChar); 1150 if(newLine[firstChar] != blank ) 1151 PutChar(newLine[firstChar]); 1152 ClrToEOL(blank); 1153 } else if( (nLastChar != oLastChar) 1154 && (newLine[nLastChar] != oldLine[oLastChar] 1155 || !(_nc_idcok && has_ic())) ) { 1156 GoTo(lineno, firstChar); 1157 if ((oLastChar - nLastChar) > SP->_el_cost) { 1158 if(PutRange(oldLine, newLine, lineno, firstChar, nLastChar)) 1159 GoTo(lineno, nLastChar+1); 1160 ClrToEOL(blank); 1161 } else { 1162 n = max( nLastChar , oLastChar ); 1163 PutRange(oldLine, newLine, lineno, firstChar, n); 1164 } 1165 } else { 1166 int nLastNonblank = nLastChar; 1167 int oLastNonblank = oLastChar; 1168 1169 /* find the last characters that really differ */ 1170 while (newLine[nLastChar] == oldLine[oLastChar]) { 1171 if (nLastChar != 0 1172 && oLastChar != 0) { 1173 nLastChar--; 1174 oLastChar--; 1175 } else { 1176 break; 1177 } 1178 } 1179 1180 n = min(oLastChar, nLastChar); 1181 if (n >= firstChar) { 1182 GoTo(lineno, firstChar); 1183 PutRange(oldLine, newLine, lineno, firstChar, n); 1184 } 1185 1186 if (oLastChar < nLastChar) { 1187 int m = max(nLastNonblank, oLastNonblank); 1188 GoTo(lineno, n+1); 1189 if (InsCharCost(nLastChar - oLastChar) 1190 > (m - n)) { 1191 PutRange(oldLine, newLine, lineno, n+1, m); 1192 } else { 1193 InsStr(&newLine[n+1], nLastChar - oLastChar); 1194 } 1195 } else if (oLastChar > nLastChar ) { 1196 GoTo(lineno, n+1); 1197 if (DelCharCost(oLastChar - nLastChar) 1198 > SP->_el_cost + nLastNonblank - (n+1)) { 1199 if(PutRange(oldLine, newLine, lineno, 1200 n+1, nLastNonblank)) 1201 GoTo(lineno, nLastNonblank+1); 1202 ClrToEOL(blank); 1203 } else { 1204 /* 1205 * The delete-char sequence will 1206 * effectively shift in blanks from the 1207 * right margin of the screen. Ensure 1208 * that they are the right color by 1209 * setting the video attributes from 1210 * the last character on the row. 1211 */ 1212 UpdateAttrs(blank); 1213 DelChar(oLastChar - nLastChar); 1214 } 1215 } 1216 } 1217 } 1218 1219 /* update the code's internal representation */ 1220 if (screen_columns > firstChar) 1221 memcpy( oldLine + firstChar, 1222 newLine + firstChar, 1223 (screen_columns - firstChar) * sizeof(chtype)); 1224} 1225 1226/* 1227** ClearScreen(blank) 1228** 1229** Clear the physical screen and put cursor at home 1230** 1231*/ 1232 1233static void ClearScreen(chtype blank) 1234{ 1235 int i, j; 1236 1237 T(("ClearScreen() called")); 1238 1239 if (clear_screen) { 1240 UpdateAttrs(blank); 1241 TPUTS_TRACE("clear_screen"); 1242 putp(clear_screen); 1243 SP->_cursrow = SP->_curscol = 0; 1244 position_check(SP->_cursrow, SP->_curscol, "ClearScreen"); 1245 } else if (clr_eos) { 1246 SP->_cursrow = SP->_curscol = -1; 1247 GoTo(0,0); 1248 1249 UpdateAttrs(blank); 1250 TPUTS_TRACE("clr_eos"); 1251 putp(clr_eos); 1252 } else if (clr_eol) { 1253 SP->_cursrow = SP->_curscol = -1; 1254 1255 for (i = 0; i < screen_lines; i++) { 1256 GoTo(i, 0); 1257 UpdateAttrs(blank); 1258 TPUTS_TRACE("clr_eol"); 1259 putp(clr_eol); 1260 } 1261 GoTo(0,0); 1262 } else { 1263 T(("cannot clear screen")); 1264 return; 1265 } 1266 1267 for (i = 0; i < screen_lines; i++) { 1268 for (j = 0; j < screen_columns; j++) 1269 curscr->_line[i].text[j] = blank; 1270 } 1271 1272 T(("screen cleared")); 1273} 1274 1275/* 1276** InsStr(line, count) 1277** 1278** Insert the count characters pointed to by line. 1279** 1280*/ 1281 1282static void InsStr(chtype *line, int count) 1283{ 1284 T(("InsStr(%p,%d) called", line, count)); 1285 1286 /* Prefer parm_ich as it has the smallest cost - no need to shift 1287 * the whole line on each character. */ 1288 /* The order must match that of InsCharCost. */ 1289 if (parm_ich) { 1290 TPUTS_TRACE("parm_ich"); 1291 tputs(tparm(parm_ich, count), count, _nc_outch); 1292 while (count) { 1293 PutAttrChar(*line); 1294 line++; 1295 count--; 1296 } 1297 } else if (enter_insert_mode && exit_insert_mode) { 1298 TPUTS_TRACE("enter_insert_mode"); 1299 putp(enter_insert_mode); 1300 while (count) { 1301 PutAttrChar(*line); 1302 if (insert_padding) 1303 { 1304 TPUTS_TRACE("insert_padding"); 1305 putp(insert_padding); 1306 } 1307 line++; 1308 count--; 1309 } 1310 TPUTS_TRACE("exit_insert_mode"); 1311 putp(exit_insert_mode); 1312 } else { 1313 while (count) { 1314 TPUTS_TRACE("insert_character"); 1315 putp(insert_character); 1316 PutAttrChar(*line); 1317 if (insert_padding) 1318 { 1319 TPUTS_TRACE("insert_padding"); 1320 putp(insert_padding); 1321 } 1322 line++; 1323 count--; 1324 } 1325 } 1326 position_check(SP->_cursrow, SP->_curscol, "InsStr"); 1327} 1328 1329/* 1330** DelChar(count) 1331** 1332** Delete count characters at current position 1333** 1334*/ 1335 1336static void DelChar(int count) 1337{ 1338 T(("DelChar(%d) called, position = (%d,%d)", count, newscr->_cury, newscr->_curx)); 1339 1340 if (parm_dch) { 1341 TPUTS_TRACE("parm_dch"); 1342 tputs(tparm(parm_dch, count), count, _nc_outch); 1343 } else { 1344 while (count--) 1345 { 1346 TPUTS_TRACE("delete_character"); 1347 putp(delete_character); 1348 } 1349 } 1350} 1351 1352/* 1353** _nc_outstr(char *str) 1354** 1355** Emit a string without waiting for update. 1356*/ 1357 1358void _nc_outstr(const char *str) 1359{ 1360 (void) putp(str); 1361 _nc_flush(); 1362} 1363 1364/* 1365 * Physical-scrolling support 1366 * 1367 * This code was adapted from Keith Bostic's hardware scrolling 1368 * support for 4.4BSD curses. I (esr) translated it to use terminfo 1369 * capabilities, narrowed the call interface slightly, and cleaned 1370 * up some convoluted tests. I also added support for the memory_above 1371 * memory_below, and non_dest_scroll_region capabilities. 1372 * 1373 * For this code to work, we must have either 1374 * change_scroll_region and scroll forward/reverse commands, or 1375 * insert and delete line capabilities. 1376 * When the scrolling region has been set, the cursor has to 1377 * be at the last line of the region to make the scroll up 1378 * happen, or on the first line of region to scroll down. 1379 * 1380 * This code makes one aesthetic decision in the opposite way from 1381 * BSD curses. BSD curses preferred pairs of il/dl operations 1382 * over scrolls, allegedly because il/dl looked faster. We, on 1383 * the other hand, prefer scrolls because (a) they're just as fast 1384 * on many terminals and (b) using them avoids bouncing an 1385 * unchanged bottom section of the screen up and down, which is 1386 * visually nasty. 1387 * 1388 * (lav): added more cases, used dl/il when bot==maxy and in csr case. 1389 * 1390 * I used assumption that capabilities il/il1/dl/dl1 work inside 1391 * changed scroll region not shifting screen contents outside of it. 1392 * If there are any terminals behaving different way, it would be 1393 * necessary to add some conditions to scroll_csr_forward/backward. 1394 */ 1395 1396/* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */ 1397static int scroll_csr_forward(int n, int top, int bot, int miny, int maxy, chtype blank) 1398{ 1399 int i; 1400 1401 if (n == 1 && scroll_forward && top == miny && bot == maxy) 1402 { 1403 GoTo(bot, 0); 1404 UpdateAttrs(blank); 1405 TPUTS_TRACE("scroll_forward"); 1406 tputs(scroll_forward, 0, _nc_outch); 1407 } 1408 else if (n == 1 && delete_line && bot == maxy) 1409 { 1410 GoTo(top, 0); 1411 UpdateAttrs(blank); 1412 TPUTS_TRACE("delete_line"); 1413 tputs(delete_line, 0, _nc_outch); 1414 } 1415 else if (parm_index && top == miny && bot == maxy) 1416 { 1417 GoTo(bot, 0); 1418 UpdateAttrs(blank); 1419 TPUTS_TRACE("parm_index"); 1420 tputs(tparm(parm_index, n, 0), n, _nc_outch); 1421 } 1422 else if (parm_delete_line && bot == maxy) 1423 { 1424 GoTo(top, 0); 1425 UpdateAttrs(blank); 1426 TPUTS_TRACE("parm_delete_line"); 1427 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1428 } 1429 else if (scroll_forward && top == miny && bot == maxy) 1430 { 1431 GoTo(bot, 0); 1432 UpdateAttrs(blank); 1433 for (i = 0; i < n; i++) 1434 { 1435 TPUTS_TRACE("scroll_forward"); 1436 tputs(scroll_forward, 0, _nc_outch); 1437 } 1438 } 1439 else if (delete_line && bot == maxy) 1440 { 1441 GoTo(top, 0); 1442 UpdateAttrs(blank); 1443 for (i = 0; i < n; i++) 1444 { 1445 TPUTS_TRACE("delete_line"); 1446 tputs(delete_line, 0, _nc_outch); 1447 } 1448 } 1449 else 1450 return ERR; 1451 1452 return OK; 1453} 1454 1455/* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */ 1456/* n > 0 */ 1457static int scroll_csr_backward(int n, int top, int bot, int miny, int maxy, chtype blank) 1458{ 1459 int i; 1460 1461 if (n == 1 && scroll_reverse && top == miny && bot == maxy) 1462 { 1463 GoTo(top, 0); 1464 UpdateAttrs(blank); 1465 TPUTS_TRACE("scroll_reverse"); 1466 tputs(scroll_reverse, 0, _nc_outch); 1467 } 1468 else if (n == 1 && insert_line && bot == maxy) 1469 { 1470 GoTo(top, 0); 1471 UpdateAttrs(blank); 1472 TPUTS_TRACE("insert_line"); 1473 tputs(insert_line, 0, _nc_outch); 1474 } 1475 else if (parm_rindex && top == miny && bot == maxy) 1476 { 1477 GoTo(top, 0); 1478 UpdateAttrs(blank); 1479 TPUTS_TRACE("parm_rindex"); 1480 tputs(tparm(parm_rindex, n, 0), n, _nc_outch); 1481 } 1482 else if (parm_insert_line && bot == maxy) 1483 { 1484 GoTo(top, 0); 1485 UpdateAttrs(blank); 1486 TPUTS_TRACE("parm_insert_line"); 1487 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1488 } 1489 else if (scroll_reverse && top == miny && bot == maxy) 1490 { 1491 GoTo(top, 0); 1492 UpdateAttrs(blank); 1493 for (i = 0; i < n; i++) 1494 { 1495 TPUTS_TRACE("scroll_reverse"); 1496 tputs(scroll_reverse, 0, _nc_outch); 1497 } 1498 } 1499 else if (insert_line && bot == maxy) 1500 { 1501 GoTo(top, 0); 1502 UpdateAttrs(blank); 1503 for (i = 0; i < n; i++) 1504 { 1505 TPUTS_TRACE("insert_line"); 1506 tputs(insert_line, 0, _nc_outch); 1507 } 1508 } 1509 else 1510 return ERR; 1511 1512 return OK; 1513} 1514 1515/* scroll by using delete_line at del and insert_line at ins */ 1516/* n > 0 */ 1517static int scroll_idl(int n, int del, int ins, chtype blank) 1518{ 1519 int i; 1520 1521 if(!((parm_delete_line || delete_line) && (parm_insert_line || insert_line))) 1522 return ERR; 1523 1524 GoTo(del, 0); 1525 UpdateAttrs(blank); 1526 if (n == 1 && delete_line) 1527 { 1528 TPUTS_TRACE("delete_line"); 1529 tputs(delete_line, 0, _nc_outch); 1530 } 1531 else if (parm_delete_line) 1532 { 1533 TPUTS_TRACE("parm_delete_line"); 1534 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1535 } 1536 else /* if (delete_line) */ 1537 { 1538 for (i = 0; i < n; i++) 1539 { 1540 TPUTS_TRACE("delete_line"); 1541 tputs(delete_line, 0, _nc_outch); 1542 } 1543 } 1544 1545 GoTo(ins, 0); 1546 UpdateAttrs(blank); 1547 if (n == 1 && insert_line) 1548 { 1549 TPUTS_TRACE("insert_line"); 1550 tputs(insert_line, 0, _nc_outch); 1551 } 1552 else if (parm_insert_line) 1553 { 1554 TPUTS_TRACE("parm_insert_line"); 1555 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1556 } 1557 else /* if (insert_line) */ 1558 { 1559 for (i = 0; i < n; i++) 1560 { 1561 TPUTS_TRACE("insert_line"); 1562 tputs(insert_line, 0, _nc_outch); 1563 } 1564 } 1565 1566 return OK; 1567} 1568 1569int _nc_scrolln(int n, int top, int bot, int maxy) 1570/* scroll region from top to bot by n lines */ 1571{ 1572 chtype blank=ClrBlank(stdscr); 1573 int i; 1574 bool cursor_saved=FALSE; 1575 int res; 1576 1577 TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy)); 1578 1579#if USE_XMC_SUPPORT 1580 /* 1581 * If we scroll, we might remove a cookie. 1582 */ 1583 if (magic_cookie_glitch > 0) { 1584 return (ERR); 1585 } 1586#endif 1587 1588 if (n > 0) /* scroll up (forward) */ 1589 { 1590 /* 1591 * Explicitly clear if stuff pushed off top of region might 1592 * be saved by the terminal. 1593 */ 1594 if (non_dest_scroll_region || (memory_above && top == 0)) { 1595 for (i = 0; i < n; i++) 1596 { 1597 GoTo(i, 0); 1598 ClrToEOL(BLANK); 1599 } 1600 } 1601 1602 res = scroll_csr_forward(n, top, bot, 0, maxy, blank); 1603 1604 if (res == ERR && change_scroll_region) 1605 { 1606 if ((((n==1 && scroll_forward) || parm_index) 1607 && (SP->_cursrow == bot || SP->_cursrow == bot-1)) 1608 && save_cursor && restore_cursor) 1609 { 1610 cursor_saved=TRUE; 1611 TPUTS_TRACE("save_cursor"); 1612 tputs(save_cursor, 0, _nc_outch); 1613 } 1614 TPUTS_TRACE("change_scroll_region"); 1615 tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch); 1616 if (cursor_saved) 1617 { 1618 TPUTS_TRACE("restore_cursor"); 1619 tputs(restore_cursor, 0, _nc_outch); 1620 } 1621 else 1622 { 1623 SP->_cursrow = SP->_curscol = -1; 1624 } 1625 1626 res = scroll_csr_forward(n, top, bot, top, bot, blank); 1627 1628 TPUTS_TRACE("change_scroll_region"); 1629 tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch); 1630 SP->_cursrow = SP->_curscol = -1; 1631 } 1632 1633 if (res == ERR && _nc_idlok) 1634 res = scroll_idl(n, top, bot-n+1, blank); 1635 } 1636 else /* (n < 0) - scroll down (backward) */ 1637 { 1638 /* 1639 * Do explicit clear to end of region if it's possible that the 1640 * terminal might hold on to stuff we push off the end. 1641 */ 1642 if (non_dest_scroll_region || (memory_below && bot == maxy)) 1643 { 1644 if (bot == maxy && clr_eos) 1645 { 1646 GoTo(maxy + n, 0); 1647 ClrToEOS(BLANK); 1648 } 1649 else if (clr_eol) 1650 { 1651 for (i = 0; i < -n; i++) 1652 { 1653 GoTo(maxy + n + i, 0); 1654 ClrToEOL(BLANK); 1655 } 1656 } 1657 } 1658 1659 res = scroll_csr_backward(-n, top, bot, 0, maxy, blank); 1660 1661 if (res == ERR && change_scroll_region) 1662 { 1663 if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top-1) 1664 && save_cursor && restore_cursor) 1665 { 1666 cursor_saved=TRUE; 1667 TPUTS_TRACE("save_cursor"); 1668 tputs(save_cursor, 0, _nc_outch); 1669 } 1670 TPUTS_TRACE("change_scroll_region"); 1671 tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch); 1672 if (cursor_saved) 1673 { 1674 TPUTS_TRACE("restore_cursor"); 1675 tputs(restore_cursor, 0, _nc_outch); 1676 } 1677 else 1678 { 1679 SP->_cursrow = SP->_curscol = -1; 1680 } 1681 1682 res = scroll_csr_backward(-n, top, bot, top, bot, blank); 1683 1684 TPUTS_TRACE("change_scroll_region"); 1685 tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch); 1686 SP->_cursrow = SP->_curscol = -1; 1687 } 1688 1689 if (res == ERR && _nc_idlok) 1690 res = scroll_idl(-n, bot+n+1, top, blank); 1691 } 1692 1693 if (res == ERR) 1694 return(ERR); 1695 1696 _nc_scroll_window(curscr, n, top, bot, blank); 1697 1698 /* shift hash values too - they can be reused */ 1699 _nc_scroll_oldhash(n, top, bot); 1700 1701 return(OK); 1702} 1703 1704 1705void _nc_screen_resume() 1706{ 1707 /* make sure terminal is in a sane known state */ 1708 SP->_current_attr = A_NORMAL; 1709 newscr->_clear = TRUE; 1710 1711 if (SP->_coloron == TRUE && orig_pair) 1712 putp(orig_pair); 1713 if (exit_attribute_mode) 1714 putp(exit_attribute_mode); 1715 else 1716 { 1717 /* turn off attributes */ 1718 if (exit_alt_charset_mode) 1719 putp(exit_alt_charset_mode); 1720 if (exit_standout_mode) 1721 putp(exit_standout_mode); 1722 if (exit_underline_mode) 1723 putp(exit_underline_mode); 1724 } 1725 if (exit_insert_mode) 1726 putp(exit_insert_mode); 1727 if (enter_am_mode && exit_am_mode) 1728 putp(auto_right_margin ? enter_am_mode : exit_am_mode); 1729} 1730 1731void _nc_screen_init() 1732{ 1733 _nc_screen_resume(); 1734} 1735 1736/* wrap up screen handling */ 1737void _nc_screen_wrap() 1738{ 1739 UpdateAttrs(A_NORMAL); 1740} 1741 1742#if USE_XMC_SUPPORT 1743void _nc_do_xmc_glitch(attr_t previous) 1744{ 1745 attr_t chg = XMC_CHANGES(previous ^ SP->_current_attr); 1746 1747 while (chg != 0) { 1748 if (chg & 1) { 1749 SP->_curscol += magic_cookie_glitch; 1750 if (SP->_curscol >= SP->_columns) 1751 wrap_cursor(); 1752 T(("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol)); 1753 } 1754 chg >>= 1; 1755 } 1756} 1757#endif /* USE_XMC_SUPPORT */ 1758