1 /* $OpenBSD: tty_update.c,v 1.5 2000/01/16 01:35:18 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998-2000 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 33 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 34 ****************************************************************************/ 35 36 37 /*----------------------------------------------------------------- 38 * 39 * lib_doupdate.c 40 * 41 * The routine doupdate() and its dependents. Also _nc_outstr(), 42 * so all physical output is concentrated here (except _nc_outch() 43 * in lib_tputs.c). 44 * 45 *-----------------------------------------------------------------*/ 46 47 #ifdef __BEOS__ 48 #include <OS.h> 49 #endif 50 51 #include <curses.priv.h> 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 #include <stropts.h> 69 #include <poll.h> 70 #elif HAVE_SELECT 71 #if HAVE_SYS_SELECT_H 72 #include <sys/select.h> 73 #endif 74 #endif 75 76 #include <term.h> 77 78 MODULE_ID("$From: tty_update.c,v 1.123 2000/01/15 23:49:36 tom Exp $") 79 80 /* 81 * This define controls the line-breakout optimization. Every once in a 82 * while during screen refresh, we want to check for input and abort the 83 * update if there's some waiting. CHECK_INTERVAL controls the number of 84 * changed lines to be emitted between input checks. 85 * 86 * Note: Input-check-and-abort is no longer done if the screen is being 87 * updated from scratch. This is a feature, not a bug. 88 */ 89 #define CHECK_INTERVAL 5 90 91 #define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase) 92 /* 93 * Enable checking to see if doupdate and friends are tracking the true 94 * cursor position correctly. NOTE: this is a debugging hack which will 95 * work ONLY on ANSI-compatible terminals! 96 */ 97 /* #define POSITION_DEBUG */ 98 99 static inline chtype ClrBlank ( WINDOW *win ); 100 static int ClrBottom(int total); 101 static void ClearScreen( chtype blank ); 102 static void ClrUpdate( void ); 103 static void DelChar( int count ); 104 static void InsStr( chtype *line, int count ); 105 static void TransformLine( int const lineno ); 106 107 #ifdef POSITION_DEBUG 108 /**************************************************************************** 109 * 110 * Debugging code. Only works on ANSI-standard terminals. 111 * 112 ****************************************************************************/ 113 114 static void position_check(int expected_y, int expected_x, char *legend) 115 /* check to see if the real cursor position matches the virtual */ 116 { 117 char buf[20]; 118 int y, x; 119 120 if (!_nc_tracing || (expected_y < 0 && expected_x < 0)) 121 return; 122 123 memset(buf, '\0', sizeof(buf)); 124 putp("\033[6n"); /* only works on ANSI-compatibles */ 125 _nc_flush(); 126 (void) read(0, buf, sizeof(buf)-1); 127 _tracef("probe returned %s", _nc_visbuf(buf)); 128 129 /* try to interpret as a position report */ 130 if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) { 131 _tracef("position probe failed in %s", legend); 132 } else { 133 if (expected_x < 0) 134 expected_x = x - 1; 135 if (expected_y < 0) 136 expected_y = y - 1; 137 if (y - 1 != expected_y || x - 1 != expected_x) { 138 beep(); 139 _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s", 140 y-1, x-1, expected_y, expected_x, legend); 141 } else { 142 _tracef("position matches OK in %s", legend); 143 } 144 } 145 } 146 #else 147 #define position_check(expected_y, expected_x, legend) /* nothing */ 148 #endif /* POSITION_DEBUG */ 149 150 /**************************************************************************** 151 * 152 * Optimized update code 153 * 154 ****************************************************************************/ 155 156 static inline void GoTo(int const row, int const col) 157 { 158 chtype oldattr = SP->_current_attr; 159 160 TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)", 161 row, col, SP->_cursrow, SP->_curscol)); 162 163 position_check(SP->_cursrow, SP->_curscol, "GoTo"); 164 165 /* 166 * Force restore even if msgr is on when we're in an alternate 167 * character set -- these have a strong tendency to screw up the 168 * CR & LF used for local character motions! 169 */ 170 if ((oldattr & A_ALTCHARSET) 171 || (oldattr && !move_standout_mode)) 172 { 173 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move", 174 oldattr, _traceattr(oldattr))); 175 vidattr(A_NORMAL); 176 } 177 178 mvcur(SP->_cursrow, SP->_curscol, row, col); 179 SP->_cursrow = row; 180 SP->_curscol = col; 181 position_check(SP->_cursrow, SP->_curscol, "GoTo2"); 182 } 183 184 static inline void PutAttrChar(chtype ch) 185 { 186 if (tilde_glitch && (TextOf(ch) == '~')) 187 ch = ('`' | AttrOf(ch)); 188 189 TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)", 190 _tracechtype(ch), 191 SP->_cursrow, SP->_curscol)); 192 UpdateAttrs(ch); 193 if (SP->_cleanup) { 194 _nc_outch((int)TextOf(ch)); 195 } else { 196 putc((int)TextOf(ch), SP->_ofp); /* macro's fastest... */ 197 #ifdef TRACE 198 _nc_outchars++; 199 #endif /* TRACE */ 200 } 201 SP->_curscol++; 202 if (char_padding) { 203 TPUTS_TRACE("char_padding"); 204 putp(char_padding); 205 } 206 } 207 208 static bool check_pending(void) 209 /* check for pending input */ 210 { 211 bool have_pending = FALSE; 212 213 /* 214 * Only carry out this check when the flag is zero, otherwise we'll 215 * have the refreshing slow down drastically (or stop) if there's an 216 * unread character available. 217 */ 218 if(SP->_fifohold != 0) 219 return FALSE; 220 221 if (SP->_checkfd >= 0) { 222 #if USE_FUNC_POLL 223 struct pollfd fds[1]; 224 fds[0].fd = SP->_checkfd; 225 fds[0].events = POLLIN; 226 if (poll(fds, 1, 0) > 0) 227 { 228 have_pending = TRUE; 229 } 230 #elif defined(__BEOS__) 231 /* 232 * BeOS's select() is declared in socket.h, so the configure script does 233 * not see it. That's just as well, since that function works only for 234 * sockets. This (using snooze and ioctl) was distilled from Be's patch 235 * for ncurses which uses a separate thread to simulate select(). 236 * 237 * FIXME: the return values from the ioctl aren't very clear if we get 238 * interrupted. 239 */ 240 int n = 0; 241 int howmany = ioctl(0, 'ichr', &n); 242 if (howmany >= 0 && n > 0) { 243 have_pending = TRUE; 244 } 245 #elif HAVE_SELECT 246 fd_set fdset; 247 struct timeval ktimeout; 248 249 ktimeout.tv_sec = 250 ktimeout.tv_usec = 0; 251 252 FD_ZERO(&fdset); 253 FD_SET(SP->_checkfd, &fdset); 254 if (select(SP->_checkfd+1, &fdset, NULL, NULL, &ktimeout) != 0) 255 { 256 have_pending = TRUE; 257 } 258 #endif 259 } 260 if (have_pending) { 261 SP->_fifohold = 5; 262 _nc_flush(); 263 } 264 return FALSE; 265 } 266 267 /* 268 * No one supports recursive inline functions. However, gcc is quieter if we 269 * instantiate the recursive part separately. 270 */ 271 #if CC_HAS_INLINE_FUNCS 272 static void callPutChar(chtype const); 273 #else 274 #define callPutChar(ch) PutChar(ch) 275 #endif 276 277 static inline void PutChar(chtype const ch); /* forward declaration */ 278 279 /* put char at lower right corner */ 280 static void PutCharLR(chtype const ch) 281 { 282 if (!auto_right_margin) 283 { 284 /* we can put the char directly */ 285 PutAttrChar(ch); 286 } 287 else if (enter_am_mode && exit_am_mode) 288 { 289 /* we can suppress automargin */ 290 TPUTS_TRACE("exit_am_mode"); 291 putp(exit_am_mode); 292 293 PutAttrChar(ch); 294 SP->_curscol--; 295 position_check(SP->_cursrow, SP->_curscol, "exit_am_mode"); 296 297 TPUTS_TRACE("enter_am_mode"); 298 putp(enter_am_mode); 299 } 300 else if ((enter_insert_mode && exit_insert_mode) 301 || insert_character || parm_ich) 302 { 303 GoTo(screen_lines-1,screen_columns-2); 304 callPutChar(ch); 305 GoTo(screen_lines-1,screen_columns-2); 306 InsStr(newscr->_line[screen_lines-1].text+screen_columns-2,1); 307 } 308 } 309 310 static void wrap_cursor(void) 311 { 312 if (eat_newline_glitch) 313 { 314 /* 315 * xenl can manifest two different ways. The vt100 316 * way is that, when you'd expect the cursor to wrap, 317 * it stays hung at the right margin (on top of the 318 * character just emitted) and doesn't wrap until the 319 * *next* graphic char is emitted. The c100 way is 320 * to ignore LF received just after an am wrap. 321 * 322 * An aggressive way to handle this would be to 323 * emit CR/LF after the char and then assume the wrap 324 * is done, you're on the first position of the next 325 * line, and the terminal out of its weird state. 326 * Here it's safe to just tell the code that the 327 * cursor is in hyperspace and let the next mvcur() 328 * call straighten things out. 329 */ 330 SP->_curscol = -1; 331 SP->_cursrow = -1; 332 } 333 else if (auto_right_margin) 334 { 335 SP->_curscol = 0; 336 SP->_cursrow++; 337 } 338 else 339 { 340 SP->_curscol--; 341 } 342 position_check(SP->_cursrow, SP->_curscol, "wrap_cursor"); 343 } 344 345 static inline void PutChar(chtype const ch) 346 /* insert character, handling automargin stuff */ 347 { 348 if (SP->_cursrow == screen_lines-1 && SP->_curscol == screen_columns-1) 349 PutCharLR(ch); 350 else 351 PutAttrChar(ch); 352 353 if (SP->_curscol >= screen_columns) 354 wrap_cursor(); 355 356 position_check(SP->_cursrow, SP->_curscol, "PutChar"); 357 } 358 359 /* 360 * Issue a given span of characters from an array. 361 * Must be functionally equivalent to: 362 * for (i = 0; i < num; i++) 363 * PutChar(ntext[i]); 364 * but can leave the cursor positioned at the middle of the interval. 365 * 366 * Returns: 0 - cursor is at the end of interval 367 * 1 - cursor is somewhere in the middle 368 * 369 * This code is optimized using ech and rep. 370 */ 371 static int EmitRange(const chtype *ntext, int num) 372 { 373 int i; 374 375 if (erase_chars || repeat_char) 376 { 377 while (num > 0) 378 { 379 int runcount; 380 chtype ntext0; 381 382 while (num>1 && ntext[0]!=ntext[1]) 383 { 384 PutChar(ntext[0]); 385 ntext++; 386 num--; 387 } 388 ntext0 = ntext[0]; 389 if (num==1) 390 { 391 PutChar(ntext0); 392 return 0; 393 } 394 runcount = 2; 395 396 while (runcount < num && ntext[runcount] == ntext0) 397 runcount++; 398 399 /* 400 * The cost expression in the middle isn't exactly right. 401 * _cup_cost is an upper bound on the cost for moving to the 402 * end of the erased area, but not the cost itself (which we 403 * can't compute without emitting the move). This may result 404 * in erase_chars not getting used in some situations for 405 * which it would be marginally advantageous. 406 */ 407 if (erase_chars 408 && runcount > SP->_ech_cost + SP->_cup_cost 409 && can_clear_with(ntext0)) 410 { 411 UpdateAttrs(ntext0); 412 putp(tparm(erase_chars, runcount)); 413 414 /* 415 * If this is the last part of the given interval, 416 * don't bother moving cursor, since it can be the 417 * last update on the line. 418 */ 419 if (runcount < num) 420 GoTo(SP->_cursrow, SP->_curscol + runcount); 421 else 422 return 1; /* cursor stays in the middle */ 423 } 424 else if (repeat_char && runcount > SP->_rep_cost) 425 { 426 bool wrap_possible = (SP->_curscol + runcount >= screen_columns); 427 int rep_count = runcount; 428 429 if (wrap_possible) 430 rep_count--; 431 432 UpdateAttrs(ntext0); 433 putp(tparm(repeat_char, TextOf(ntext0), rep_count)); 434 SP->_curscol += rep_count; 435 436 if (wrap_possible) 437 PutChar(ntext0); 438 } 439 else 440 { 441 for (i = 0; i < runcount; i++) 442 PutChar(ntext[i]); 443 } 444 ntext += runcount; 445 num -= runcount; 446 } 447 return 0; 448 } 449 450 for (i = 0; i < num; i++) 451 PutChar(ntext[i]); 452 return 0; 453 } 454 455 /* 456 * Output the line in the given range [first .. last] 457 * 458 * If there's a run of identical characters that's long enough to justify 459 * cursor movement, use that also. 460 * 461 * Returns: same as EmitRange 462 */ 463 static int PutRange( 464 const chtype *otext, 465 const chtype *ntext, 466 int row, 467 int first, int last) 468 { 469 int j, run; 470 int cost = min(SP->_cup_ch_cost, SP->_hpa_ch_cost); 471 472 TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)", 473 otext, ntext, row, first, last)); 474 475 if (otext != ntext 476 && (last-first+1) > cost) { 477 for (j = first, run = 0; j <= last; j++) { 478 if (otext[j] == ntext[j]) { 479 run++; 480 } else { 481 if (run > cost) { 482 int before_run = (j - run); 483 EmitRange(ntext+first, before_run-first); 484 GoTo(row, first = j); 485 } 486 run = 0; 487 } 488 } 489 } 490 return EmitRange(ntext + first, last-first+1); 491 } 492 493 #if CC_HAS_INLINE_FUNCS 494 static void callPutChar(chtype const ch) 495 { 496 PutChar(ch); 497 } 498 #endif 499 500 #define MARK_NOCHANGE(win,row) \ 501 { \ 502 win->_line[row].firstchar = _NOCHANGE; \ 503 win->_line[row].lastchar = _NOCHANGE; \ 504 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row); \ 505 } 506 507 int doupdate(void) 508 { 509 int i; 510 int nonempty; 511 #if USE_TRACE_TIMES 512 struct tms before, after; 513 #endif /* USE_TRACE_TIMES */ 514 515 T((T_CALLED("doupdate()"))); 516 517 #ifdef TRACE 518 if (_nc_tracing & TRACE_UPDATE) 519 { 520 if (curscr->_clear) 521 _tracef("curscr is clear"); 522 else 523 _tracedump("curscr", curscr); 524 _tracedump("newscr", newscr); 525 } 526 #endif /* TRACE */ 527 528 _nc_signal_handler(FALSE); 529 530 if (SP->_fifohold) 531 SP->_fifohold--; 532 533 #if USE_SIZECHANGE 534 if (SP->_endwin || SP->_sig_winch) 535 { 536 /* 537 * This is a transparent extension: XSI does not address it, 538 * and applications need not know that ncurses can do it. 539 * 540 * Check if the terminal size has changed while curses was off 541 * (this can happen in an xterm, for example), and resize the 542 * ncurses data structures accordingly. 543 */ 544 _nc_update_screensize(); 545 } 546 #endif 547 548 if (SP->_endwin) { 549 550 T(("coming back from shell mode")); 551 reset_prog_mode(); 552 553 _nc_mvcur_resume(); 554 _nc_screen_resume(); 555 SP->_mouse_resume(SP); 556 557 SP->_endwin = FALSE; 558 } 559 560 #if USE_TRACE_TIMES 561 /* zero the metering machinery */ 562 _nc_outchars = 0; 563 (void) times(&before); 564 #endif /* USE_TRACE_TIMES */ 565 566 /* 567 * This is the support for magic-cookie terminals. The 568 * theory: we scan the virtual screen looking for attribute 569 * turnons. Where we find one, check to make sure it's 570 * realizable by seeing if the required number of 571 * un-attributed blanks are present before and after the 572 * attributed range; try to shift the range boundaries over 573 * blanks (not changing the screen display) so this becomes 574 * true. If it is, shift the beginning attribute change 575 * appropriately (the end one, if we've gotten this far, is 576 * guaranteed room for its cookie). If not, nuke the added 577 * attributes out of the span. 578 */ 579 #if USE_XMC_SUPPORT 580 if (magic_cookie_glitch > 0) { 581 int j, k; 582 attr_t rattr = A_NORMAL; 583 584 for (i = 0; i < screen_lines; i++) 585 for (j = 0; j < screen_columns; j++) 586 { 587 bool failed = FALSE; 588 chtype turnon = AttrOf(newscr->_line[i].text[j]) & ~rattr; 589 590 /* is an attribute turned on here? */ 591 if (turnon == 0) { 592 rattr = AttrOf(newscr->_line[i].text[j]); 593 continue; 594 } 595 596 T(("At (%d, %d): from %s...", i, j, _traceattr(rattr))); 597 T(("...to %s",_traceattr(turnon))); 598 599 /* 600 * If the attribute change location is a blank with a 601 * "safe" attribute, undo the attribute turnon. This may 602 * ensure there's enough room to set the attribute before 603 * the first non-blank in the run. 604 */ 605 #define SAFE(a) !((a) & (chtype)~NONBLANK_ATTR) 606 if (TextOf(newscr->_line[i].text[j])==' ' && SAFE(turnon)) 607 { 608 newscr->_line[i].text[j] &= ~turnon; 609 continue; 610 } 611 612 /* check that there's enough room at start of span */ 613 for (k = 1; k <= magic_cookie_glitch; k++) 614 if (j-k < 0 615 || TextOf(newscr->_line[i].text[j-k]) != ' ' 616 || !SAFE(AttrOf(newscr->_line[i].text[j-k]))) 617 failed = TRUE; 618 if (!failed) 619 { 620 bool end_onscreen = FALSE; 621 int m, n = j; 622 623 /* find end of span, if it's onscreen */ 624 for (m = i; m < screen_lines; m++) 625 { 626 for ( ; n < screen_columns; n++) 627 { 628 if (AttrOf(newscr->_line[m].text[n]) == rattr) 629 { 630 end_onscreen = TRUE; 631 T(("Range attributed with %s ends at (%d, %d)", 632 _traceattr(turnon),m,n)); 633 goto foundit; 634 } 635 } 636 n = 0; 637 } 638 T(("Range attributed with %s ends offscreen", 639 _traceattr(turnon))); 640 foundit:; 641 642 if (end_onscreen) 643 { 644 chtype *lastline = newscr->_line[m].text; 645 646 /* 647 * If there are safely-attributed blanks at the 648 * end of the range, shorten the range. This will 649 * help ensure that there is enough room at end 650 * of span. 651 */ 652 while (n >= 0 653 && TextOf(lastline[n]) == ' ' 654 && SAFE(AttrOf(lastline[n]))) 655 lastline[n--] &= ~turnon; 656 657 /* check that there's enough room at end of span */ 658 for (k = 1; k <= magic_cookie_glitch; k++) 659 if (n + k >= screen_columns 660 || TextOf(lastline[n + k]) != ' ' 661 || !SAFE(AttrOf(lastline[n+k]))) 662 failed = TRUE; 663 } 664 } 665 666 if (failed) 667 { 668 int p, q = j; 669 670 T(("Clearing %s beginning at (%d, %d)", 671 _traceattr(turnon), i, j)); 672 673 /* turn off new attributes over span */ 674 for (p = i; p < screen_lines; p++) 675 { 676 for ( ; q < screen_columns; q++) 677 { 678 if (AttrOf(newscr->_line[p].text[q]) == rattr) 679 goto foundend; 680 newscr->_line[p].text[q] &= ~turnon; 681 } 682 q = 0; 683 } 684 foundend:; 685 } 686 else 687 { 688 T(("Cookie space for %s found before (%d, %d)", 689 _traceattr(turnon), i, j)); 690 691 /* 692 * back up the start of range so there's room 693 * for cookies before the first nonblank character 694 */ 695 for (k = 1; k <= magic_cookie_glitch; k++) 696 newscr->_line[i].text[j-k] |= turnon; 697 } 698 699 rattr = AttrOf(newscr->_line[i].text[j]); 700 } 701 702 #ifdef TRACE 703 /* show altered highlights after magic-cookie check */ 704 if (_nc_tracing & TRACE_UPDATE) 705 { 706 _tracef("After magic-cookie check..."); 707 _tracedump("newscr", newscr); 708 } 709 #endif /* TRACE */ 710 } 711 #endif /* USE_XMC_SUPPORT */ 712 713 nonempty = 0; 714 if (curscr->_clear || newscr->_clear) { /* force refresh ? */ 715 T(("clearing and updating from scratch")); 716 ClrUpdate(); 717 curscr->_clear = FALSE; /* reset flag */ 718 newscr->_clear = FALSE; /* reset flag */ 719 } else { 720 int changedlines = CHECK_INTERVAL; 721 722 if(check_pending()) 723 goto cleanup; 724 725 nonempty = min(screen_lines, newscr->_maxy+1); 726 727 if (SP->_scrolling) { 728 _nc_scroll_optimize(); 729 } 730 731 nonempty = ClrBottom(nonempty); 732 733 T(("Transforming lines, nonempty %d", nonempty)); 734 for (i = 0; i < nonempty; i++) { 735 /* 736 * Here is our line-breakout optimization. 737 */ 738 if (changedlines == CHECK_INTERVAL) 739 { 740 if (check_pending()) 741 goto cleanup; 742 changedlines = 0; 743 } 744 745 /* 746 * newscr->line[i].firstchar is normally set 747 * by wnoutrefresh. curscr->line[i].firstchar 748 * is normally set by _nc_scroll_window in the 749 * vertical-movement optimization code, 750 */ 751 if (newscr->_line[i].firstchar != _NOCHANGE 752 || curscr->_line[i].firstchar != _NOCHANGE) 753 { 754 TransformLine(i); 755 changedlines++; 756 } 757 758 /* mark line changed successfully */ 759 if (i <= newscr->_maxy) 760 MARK_NOCHANGE(newscr,i) 761 if (i <= curscr->_maxy) 762 MARK_NOCHANGE(curscr,i) 763 } 764 } 765 766 /* put everything back in sync */ 767 for (i = nonempty; i <= newscr->_maxy; i++) 768 MARK_NOCHANGE(newscr,i) 769 for (i = nonempty; i <= curscr->_maxy; i++) 770 MARK_NOCHANGE(curscr,i) 771 772 if (!newscr->_leaveok) 773 { 774 curscr->_curx = newscr->_curx; 775 curscr->_cury = newscr->_cury; 776 777 GoTo(curscr->_cury, curscr->_curx); 778 } 779 780 cleanup: 781 /* 782 * Keep the physical screen in normal mode in case we get other 783 * processes writing to the screen. 784 */ 785 UpdateAttrs(A_NORMAL); 786 787 _nc_flush(); 788 curscr->_attrs = newscr->_attrs; 789 /* curscr->_bkgd = newscr->_bkgd; */ 790 791 #if USE_TRACE_TIMES 792 (void) times(&after); 793 TR(TRACE_TIMES, ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time", 794 _nc_outchars, 795 after.tms_stime-before.tms_stime, 796 after.tms_utime-before.tms_utime)); 797 #endif /* USE_TRACE_TIMES */ 798 799 _nc_signal_handler(TRUE); 800 801 returnCode(OK); 802 } 803 804 /* 805 * ClrBlank(win) 806 * 807 * Returns the attributed character that corresponds to the "cleared" 808 * screen. If the terminal has the back-color-erase feature, this will be 809 * colored according to the wbkgd() call. 810 * 811 * We treat 'curscr' specially because it isn't supposed to be set directly 812 * in the wbkgd() call. Assume 'stdscr' for this case. 813 */ 814 #define BCE_ATTRS (A_NORMAL|A_COLOR) 815 #define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_bkgd) 816 817 static inline chtype ClrBlank (WINDOW *win) 818 { 819 chtype blank = BLANK; 820 if (back_color_erase) 821 blank |= (BCE_BKGD(win) & BCE_ATTRS); 822 return blank; 823 } 824 825 /* 826 ** ClrUpdate() 827 ** 828 ** Update by clearing and redrawing the entire screen. 829 ** 830 */ 831 832 static void ClrUpdate(void) 833 { 834 int i; 835 chtype blank = ClrBlank(stdscr); 836 int nonempty = min(screen_lines, newscr->_maxy+1); 837 838 T(("ClrUpdate() called")); 839 840 ClearScreen(blank); 841 842 T(("updating screen from scratch")); 843 844 nonempty = ClrBottom(nonempty); 845 846 for (i = 0; i < nonempty; i++) 847 TransformLine(i); 848 } 849 850 /* 851 ** ClrToEOL(blank) 852 ** 853 ** Clear to end of current line, starting at the cursor position 854 */ 855 856 static void ClrToEOL(chtype blank) 857 { 858 int j; 859 bool needclear = FALSE; 860 861 for (j = SP->_curscol; j < screen_columns; j++) 862 { 863 chtype *cp = &(curscr->_line[SP->_cursrow].text[j]); 864 865 if (*cp != blank) 866 { 867 *cp = blank; 868 needclear = TRUE; 869 } 870 } 871 872 if (needclear) 873 { 874 UpdateAttrs(blank); 875 TPUTS_TRACE("clr_eol"); 876 if (SP->_el_cost > (screen_columns - SP->_curscol) 877 #ifdef NCURSES_EXT_FUNCS 878 || FILL_BCE() 879 #endif 880 ) 881 { 882 int count = (screen_columns - SP->_curscol); 883 while (count-- > 0) 884 PutChar(blank); 885 } 886 else 887 putp(clr_eol); 888 } 889 } 890 891 /* 892 ** ClrToEOS(blank) 893 ** 894 ** Clear to end of screen, starting at the cursor position 895 */ 896 897 static void ClrToEOS(chtype blank) 898 { 899 int row, col; 900 901 row = SP->_cursrow; 902 col = SP->_curscol; 903 904 #ifdef NCURSES_EXT_FUNCS 905 if (FILL_BCE()) { 906 int i, j, k = col; 907 for (i = row; i < screen_lines; i++) { 908 GoTo(i, k); 909 UpdateAttrs(blank); 910 for (j = k; j < screen_columns; j++) 911 PutChar(blank); 912 k = 0; 913 } 914 GoTo(row, col); 915 } else 916 #endif 917 { 918 UpdateAttrs(blank); 919 TPUTS_TRACE("clr_eos"); 920 tputs(clr_eos, screen_lines-row, _nc_outch); 921 } 922 923 while (col < screen_columns) 924 curscr->_line[row].text[col++] = blank; 925 926 for (row++; row < screen_lines; row++) 927 { 928 for (col = 0; col < screen_columns; col++) 929 curscr->_line[row].text[col] = blank; 930 } 931 } 932 933 /* 934 * ClrBottom(total) 935 * 936 * Test if clearing the end of the screen would satisfy part of the 937 * screen-update. Do this by scanning backwards through the lines in the 938 * screen, checking if each is blank, and one or more are changed. 939 */ 940 static int ClrBottom(int total) 941 { 942 static chtype *tstLine; 943 static size_t lenLine; 944 945 int row, col; 946 int top = total; 947 int last = min(screen_columns, newscr->_maxx+1); 948 size_t length = sizeof(chtype) * last; 949 chtype blank = newscr->_line[total-1].text[last-1]; /* lower right char */ 950 951 if(!clr_eos || !can_clear_with(blank)) 952 return total; 953 954 if ((tstLine == 0) || (last > (int)lenLine)) { 955 tstLine = typeRealloc(chtype, last, tstLine); 956 if (tstLine != 0) { 957 lenLine = last; 958 for (col = 0; col < last; col++) 959 tstLine[col] = blank; 960 } 961 } 962 963 if (tstLine != 0) { 964 for (row = total-1; row >= 0; row--) { 965 if (memcmp(tstLine, newscr->_line[row].text, length)) 966 break; 967 if (memcmp(tstLine, curscr->_line[row].text, length)) 968 top = row; 969 } 970 971 /* don't use clr_eos for just one line if clr_eol available */ 972 if (top < total-1 || (top < total && !clr_eol && !clr_bol)) { 973 GoTo(top,0); 974 ClrToEOS(blank); 975 total = top; 976 if (SP->oldhash && SP->newhash) 977 { 978 for (row = top; row < screen_lines; row++) 979 SP->oldhash[row] = SP->newhash[row]; 980 } 981 } 982 } 983 #if NO_LEAKS 984 if (tstLine != 0) { 985 FreeAndNull(tstLine); 986 } 987 #endif 988 return total; 989 } 990 991 992 /* 993 ** TransformLine(lineno) 994 ** 995 ** Transform the given line in curscr to the one in newscr, using 996 ** Insert/Delete Character if _nc_idcok && has_ic(). 997 ** 998 ** firstChar = position of first different character in line 999 ** oLastChar = position of last different character in old line 1000 ** nLastChar = position of last different character in new line 1001 ** 1002 ** move to firstChar 1003 ** overwrite chars up to min(oLastChar, nLastChar) 1004 ** if oLastChar < nLastChar 1005 ** insert newLine[oLastChar+1..nLastChar] 1006 ** else 1007 ** delete oLastChar - nLastChar spaces 1008 */ 1009 1010 static void TransformLine(int const lineno) 1011 { 1012 int firstChar, oLastChar, nLastChar; 1013 chtype *newLine = newscr->_line[lineno].text; 1014 chtype *oldLine = curscr->_line[lineno].text; 1015 int n; 1016 bool attrchanged = FALSE; 1017 1018 T(("TransformLine(%d) called", lineno)); 1019 1020 /* copy new hash value to old one */ 1021 if (SP->oldhash && SP->newhash) 1022 SP->oldhash[lineno] = SP->newhash[lineno]; 1023 1024 if(ceol_standout_glitch && clr_eol) { 1025 firstChar = 0; 1026 while(firstChar < screen_columns) { 1027 if(AttrOf(newLine[firstChar]) != AttrOf(oldLine[firstChar])) 1028 attrchanged = TRUE; 1029 firstChar++; 1030 } 1031 } 1032 1033 firstChar = 0; 1034 1035 if (attrchanged) { /* we may have to disregard the whole line */ 1036 GoTo(lineno, firstChar); 1037 ClrToEOL(ClrBlank(curscr)); 1038 PutRange(oldLine, newLine, lineno, 0, (screen_columns-1)); 1039 #if USE_XMC_SUPPORT 1040 1041 #define NEW(r,c) newscr->_line[r].text[c] 1042 #define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0) 1043 #define xmc_turn_off(a,b) xmc_turn_on(b,a) 1044 1045 /* 1046 * This is a very simple loop to paint characters which may have the 1047 * magic cookie glitch embedded. It doesn't know much about video 1048 * attributes which are continued from one line to the next. It 1049 * assumes that we have filtered out requests for attribute changes 1050 * that do not get mapped to blank positions. 1051 * 1052 * FIXME: we are not keeping track of where we put the cookies, so this 1053 * will work properly only once, since we may overwrite a cookie in a 1054 * following operation. 1055 */ 1056 } else if (magic_cookie_glitch > 0) { 1057 GoTo(lineno, firstChar); 1058 for (n = 0; n < screen_columns; n++) { 1059 int m = n + magic_cookie_glitch; 1060 1061 /* check for turn-on: 1062 * If we are writing an attributed blank, where the 1063 * previous cell is not attributed. 1064 */ 1065 if (TextOf(newLine[n]) == ' ' 1066 && ((n > 0 1067 && xmc_turn_on(newLine[n-1], newLine[n])) 1068 || (n == 0 1069 && lineno > 0 1070 && xmc_turn_on(NEW(lineno-1,screen_columns-1), newLine[n])))) { 1071 n = m; 1072 } 1073 1074 PutChar(newLine[n]); 1075 1076 /* check for turn-off: 1077 * If we are writing an attributed non-blank, where the 1078 * next cell is blank, and not attributed. 1079 */ 1080 if (TextOf(newLine[n]) != ' ' 1081 && ((n+1 < screen_columns 1082 && xmc_turn_off(newLine[n], newLine[n+1])) 1083 || (n+1 >= screen_columns 1084 && lineno+1 < screen_lines 1085 && xmc_turn_off(newLine[n], NEW(lineno+1,0))))) { 1086 n = m; 1087 } 1088 1089 } 1090 #undef NEW 1091 #endif 1092 } else { 1093 chtype blank; 1094 1095 /* find the first differing character */ 1096 while (firstChar < screen_columns && 1097 newLine[firstChar] == oldLine[firstChar]) 1098 firstChar++; 1099 1100 /* if there wasn't one, we're done */ 1101 if (firstChar >= screen_columns) 1102 return; 1103 1104 /* it may be cheap to clear leading whitespace with clr_bol */ 1105 if (clr_bol && can_clear_with(blank=newLine[0])) 1106 { 1107 int oFirstChar, nFirstChar; 1108 1109 for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++) 1110 if (oldLine[oFirstChar] != blank) 1111 break; 1112 for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++) 1113 if (newLine[nFirstChar] != blank) 1114 break; 1115 1116 if (nFirstChar > oFirstChar + SP->_el1_cost) 1117 { 1118 if (nFirstChar >= screen_columns && SP->_el_cost <= SP->_el1_cost) 1119 { 1120 GoTo(lineno, 0); 1121 UpdateAttrs(blank); 1122 TPUTS_TRACE("clr_eol"); 1123 putp(clr_eol); 1124 } 1125 else 1126 { 1127 GoTo(lineno, nFirstChar - 1); 1128 UpdateAttrs(blank); 1129 TPUTS_TRACE("clr_bol"); 1130 putp(clr_bol); 1131 } 1132 1133 while (firstChar < nFirstChar) 1134 oldLine[firstChar++] = blank; 1135 1136 if (firstChar >= screen_columns) 1137 return; 1138 } 1139 } 1140 1141 blank = newLine[screen_columns-1]; 1142 1143 if(!can_clear_with(blank)) 1144 { 1145 /* find the last differing character */ 1146 nLastChar = screen_columns - 1; 1147 1148 while (nLastChar > firstChar 1149 && newLine[nLastChar] == oldLine[nLastChar]) 1150 nLastChar--; 1151 1152 if (nLastChar >= firstChar) { 1153 GoTo(lineno, firstChar); 1154 PutRange(oldLine, newLine, lineno, firstChar, nLastChar); 1155 memcpy( oldLine + firstChar, 1156 newLine + firstChar, 1157 (nLastChar - firstChar + 1) * sizeof(chtype)); 1158 } 1159 return; 1160 } 1161 1162 /* find last non-blank character on old line */ 1163 oLastChar = screen_columns - 1; 1164 while (oLastChar > firstChar && oldLine[oLastChar] == blank) 1165 oLastChar--; 1166 1167 /* find last non-blank character on new line */ 1168 nLastChar = screen_columns - 1; 1169 while (nLastChar > firstChar && newLine[nLastChar] == blank) 1170 nLastChar--; 1171 1172 if((nLastChar == firstChar) 1173 && (SP->_el_cost < (oLastChar - nLastChar))) { 1174 GoTo(lineno, firstChar); 1175 if(newLine[firstChar] != blank ) 1176 PutChar(newLine[firstChar]); 1177 ClrToEOL(blank); 1178 } else if( (nLastChar != oLastChar) 1179 && (newLine[nLastChar] != oldLine[oLastChar] 1180 || !(_nc_idcok && has_ic())) ) { 1181 GoTo(lineno, firstChar); 1182 if ((oLastChar - nLastChar) > SP->_el_cost) { 1183 if(PutRange(oldLine, newLine, lineno, firstChar, nLastChar)) 1184 GoTo(lineno, nLastChar+1); 1185 ClrToEOL(blank); 1186 } else { 1187 n = max( nLastChar , oLastChar ); 1188 PutRange(oldLine, newLine, lineno, firstChar, n); 1189 } 1190 } else { 1191 int nLastNonblank = nLastChar; 1192 int oLastNonblank = oLastChar; 1193 1194 /* find the last characters that really differ */ 1195 while (newLine[nLastChar] == oldLine[oLastChar]) { 1196 if (nLastChar != 0 1197 && oLastChar != 0) { 1198 nLastChar--; 1199 oLastChar--; 1200 } else { 1201 break; 1202 } 1203 } 1204 1205 n = min(oLastChar, nLastChar); 1206 if (n >= firstChar) { 1207 GoTo(lineno, firstChar); 1208 PutRange(oldLine, newLine, lineno, firstChar, n); 1209 } 1210 1211 if (oLastChar < nLastChar) { 1212 int m = max(nLastNonblank, oLastNonblank); 1213 GoTo(lineno, n+1); 1214 if (InsCharCost(nLastChar - oLastChar) 1215 > (m - n)) { 1216 PutRange(oldLine, newLine, lineno, n+1, m); 1217 } else { 1218 InsStr(&newLine[n+1], nLastChar - oLastChar); 1219 } 1220 } else if (oLastChar > nLastChar ) { 1221 GoTo(lineno, n+1); 1222 if (DelCharCost(oLastChar - nLastChar) 1223 > SP->_el_cost + nLastNonblank - (n+1)) { 1224 if(PutRange(oldLine, newLine, lineno, 1225 n+1, nLastNonblank)) 1226 GoTo(lineno, nLastNonblank+1); 1227 ClrToEOL(blank); 1228 } else { 1229 /* 1230 * The delete-char sequence will 1231 * effectively shift in blanks from the 1232 * right margin of the screen. Ensure 1233 * that they are the right color by 1234 * setting the video attributes from 1235 * the last character on the row. 1236 */ 1237 UpdateAttrs(blank); 1238 DelChar(oLastChar - nLastChar); 1239 } 1240 } 1241 } 1242 } 1243 1244 /* update the code's internal representation */ 1245 if (screen_columns > firstChar) 1246 memcpy( oldLine + firstChar, 1247 newLine + firstChar, 1248 (screen_columns - firstChar) * sizeof(chtype)); 1249 } 1250 1251 /* 1252 ** ClearScreen(blank) 1253 ** 1254 ** Clear the physical screen and put cursor at home 1255 ** 1256 */ 1257 1258 static void ClearScreen(chtype blank) 1259 { 1260 int i, j; 1261 bool fast_clear = (clear_screen || clr_eos || clr_eol); 1262 1263 T(("ClearScreen() called")); 1264 1265 #ifdef NCURSES_EXT_FUNCS 1266 if (SP->_coloron 1267 && !SP->_default_color) { 1268 _nc_do_color(0, FALSE, _nc_outch); 1269 if (!back_color_erase) { 1270 fast_clear = FALSE; 1271 } 1272 } 1273 #endif 1274 1275 if (fast_clear) { 1276 if (clear_screen) { 1277 UpdateAttrs(blank); 1278 TPUTS_TRACE("clear_screen"); 1279 putp(clear_screen); 1280 SP->_cursrow = SP->_curscol = 0; 1281 position_check(SP->_cursrow, SP->_curscol, "ClearScreen"); 1282 } else if (clr_eos) { 1283 SP->_cursrow = SP->_curscol = -1; 1284 GoTo(0,0); 1285 1286 UpdateAttrs(blank); 1287 TPUTS_TRACE("clr_eos"); 1288 putp(clr_eos); 1289 } else if (clr_eol) { 1290 SP->_cursrow = SP->_curscol = -1; 1291 1292 for (i = 0; i < screen_lines; i++) { 1293 GoTo(i, 0); 1294 UpdateAttrs(blank); 1295 TPUTS_TRACE("clr_eol"); 1296 putp(clr_eol); 1297 } 1298 GoTo(0,0); 1299 } 1300 } else { 1301 for (i = 0; i < screen_lines; i++) { 1302 GoTo(i, 0); 1303 UpdateAttrs(blank); 1304 for (j = 0; j < screen_columns; j++) 1305 PutChar(blank); 1306 } 1307 GoTo(0,0); 1308 } 1309 1310 for (i = 0; i < screen_lines; i++) { 1311 for (j = 0; j < screen_columns; j++) 1312 curscr->_line[i].text[j] = blank; 1313 } 1314 1315 T(("screen cleared")); 1316 } 1317 1318 /* 1319 ** InsStr(line, count) 1320 ** 1321 ** Insert the count characters pointed to by line. 1322 ** 1323 */ 1324 1325 static void InsStr(chtype *line, int count) 1326 { 1327 T(("InsStr(%p,%d) called", line, count)); 1328 1329 /* Prefer parm_ich as it has the smallest cost - no need to shift 1330 * the whole line on each character. */ 1331 /* The order must match that of InsCharCost. */ 1332 if (parm_ich) { 1333 TPUTS_TRACE("parm_ich"); 1334 tputs(tparm(parm_ich, count), count, _nc_outch); 1335 while (count) { 1336 PutAttrChar(*line); 1337 line++; 1338 count--; 1339 } 1340 } else if (enter_insert_mode && exit_insert_mode) { 1341 TPUTS_TRACE("enter_insert_mode"); 1342 putp(enter_insert_mode); 1343 while (count) { 1344 PutAttrChar(*line); 1345 if (insert_padding) 1346 { 1347 TPUTS_TRACE("insert_padding"); 1348 putp(insert_padding); 1349 } 1350 line++; 1351 count--; 1352 } 1353 TPUTS_TRACE("exit_insert_mode"); 1354 putp(exit_insert_mode); 1355 } else { 1356 while (count) { 1357 TPUTS_TRACE("insert_character"); 1358 putp(insert_character); 1359 PutAttrChar(*line); 1360 if (insert_padding) 1361 { 1362 TPUTS_TRACE("insert_padding"); 1363 putp(insert_padding); 1364 } 1365 line++; 1366 count--; 1367 } 1368 } 1369 position_check(SP->_cursrow, SP->_curscol, "InsStr"); 1370 } 1371 1372 /* 1373 ** DelChar(count) 1374 ** 1375 ** Delete count characters at current position 1376 ** 1377 */ 1378 1379 static void DelChar(int count) 1380 { 1381 int n; 1382 1383 T(("DelChar(%d) called, position = (%d,%d)", count, newscr->_cury, newscr->_curx)); 1384 1385 if (parm_dch) { 1386 TPUTS_TRACE("parm_dch"); 1387 tputs(tparm(parm_dch, count), count, _nc_outch); 1388 } else { 1389 for (n = 0; n < count; n++) { 1390 TPUTS_TRACE("delete_character"); 1391 putp(delete_character); 1392 } 1393 } 1394 #ifdef NCURSES_EXT_FUNCS 1395 if (FILL_BCE()) { 1396 chtype blank = ClrBlank(stdscr); 1397 GoTo(SP->_cursrow, screen_columns - count); 1398 UpdateAttrs(blank); 1399 for (n = 0; n < count; n++) { 1400 PutChar(blank); 1401 } 1402 } 1403 #endif 1404 } 1405 1406 /* 1407 ** _nc_outstr(char *str) 1408 ** 1409 ** Emit a string without waiting for update. 1410 */ 1411 1412 void _nc_outstr(const char *str) 1413 { 1414 (void) putp(str); 1415 _nc_flush(); 1416 } 1417 1418 /* 1419 * Physical-scrolling support 1420 * 1421 * This code was adapted from Keith Bostic's hardware scrolling 1422 * support for 4.4BSD curses. I (esr) translated it to use terminfo 1423 * capabilities, narrowed the call interface slightly, and cleaned 1424 * up some convoluted tests. I also added support for the memory_above 1425 * memory_below, and non_dest_scroll_region capabilities. 1426 * 1427 * For this code to work, we must have either 1428 * change_scroll_region and scroll forward/reverse commands, or 1429 * insert and delete line capabilities. 1430 * When the scrolling region has been set, the cursor has to 1431 * be at the last line of the region to make the scroll up 1432 * happen, or on the first line of region to scroll down. 1433 * 1434 * This code makes one aesthetic decision in the opposite way from 1435 * BSD curses. BSD curses preferred pairs of il/dl operations 1436 * over scrolls, allegedly because il/dl looked faster. We, on 1437 * the other hand, prefer scrolls because (a) they're just as fast 1438 * on many terminals and (b) using them avoids bouncing an 1439 * unchanged bottom section of the screen up and down, which is 1440 * visually nasty. 1441 * 1442 * (lav): added more cases, used dl/il when bot==maxy and in csr case. 1443 * 1444 * I used assumption that capabilities il/il1/dl/dl1 work inside 1445 * changed scroll region not shifting screen contents outside of it. 1446 * If there are any terminals behaving different way, it would be 1447 * necessary to add some conditions to scroll_csr_forward/backward. 1448 */ 1449 1450 /* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */ 1451 static int scroll_csr_forward(int n, int top, int bot, int miny, int maxy, chtype blank) 1452 { 1453 int i, j; 1454 1455 if (n == 1 && scroll_forward && top == miny && bot == maxy) 1456 { 1457 GoTo(bot, 0); 1458 UpdateAttrs(blank); 1459 TPUTS_TRACE("scroll_forward"); 1460 tputs(scroll_forward, 0, _nc_outch); 1461 } 1462 else if (n == 1 && delete_line && bot == maxy) 1463 { 1464 GoTo(top, 0); 1465 UpdateAttrs(blank); 1466 TPUTS_TRACE("delete_line"); 1467 tputs(delete_line, 0, _nc_outch); 1468 } 1469 else if (parm_index && top == miny && bot == maxy) 1470 { 1471 GoTo(bot, 0); 1472 UpdateAttrs(blank); 1473 TPUTS_TRACE("parm_index"); 1474 tputs(tparm(parm_index, n, 0), n, _nc_outch); 1475 } 1476 else if (parm_delete_line && bot == maxy) 1477 { 1478 GoTo(top, 0); 1479 UpdateAttrs(blank); 1480 TPUTS_TRACE("parm_delete_line"); 1481 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1482 } 1483 else if (scroll_forward && top == miny && bot == maxy) 1484 { 1485 GoTo(bot, 0); 1486 UpdateAttrs(blank); 1487 for (i = 0; i < n; i++) 1488 { 1489 TPUTS_TRACE("scroll_forward"); 1490 tputs(scroll_forward, 0, _nc_outch); 1491 } 1492 } 1493 else if (delete_line && bot == maxy) 1494 { 1495 GoTo(top, 0); 1496 UpdateAttrs(blank); 1497 for (i = 0; i < n; i++) 1498 { 1499 TPUTS_TRACE("delete_line"); 1500 tputs(delete_line, 0, _nc_outch); 1501 } 1502 } 1503 else 1504 return ERR; 1505 1506 #ifdef NCURSES_EXT_FUNCS 1507 if (FILL_BCE()) { 1508 for (i = 0; i < n; i++) { 1509 GoTo(bot-i, 0); 1510 for (j = 0; j < screen_columns; j++) 1511 PutChar(blank); 1512 } 1513 } 1514 #endif 1515 return OK; 1516 } 1517 1518 /* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */ 1519 /* n > 0 */ 1520 static int scroll_csr_backward(int n, int top, int bot, int miny, int maxy, chtype blank) 1521 { 1522 int i, j; 1523 1524 if (n == 1 && scroll_reverse && top == miny && bot == maxy) 1525 { 1526 GoTo(top, 0); 1527 UpdateAttrs(blank); 1528 TPUTS_TRACE("scroll_reverse"); 1529 tputs(scroll_reverse, 0, _nc_outch); 1530 } 1531 else if (n == 1 && insert_line && bot == maxy) 1532 { 1533 GoTo(top, 0); 1534 UpdateAttrs(blank); 1535 TPUTS_TRACE("insert_line"); 1536 tputs(insert_line, 0, _nc_outch); 1537 } 1538 else if (parm_rindex && top == miny && bot == maxy) 1539 { 1540 GoTo(top, 0); 1541 UpdateAttrs(blank); 1542 TPUTS_TRACE("parm_rindex"); 1543 tputs(tparm(parm_rindex, n, 0), n, _nc_outch); 1544 } 1545 else if (parm_insert_line && bot == maxy) 1546 { 1547 GoTo(top, 0); 1548 UpdateAttrs(blank); 1549 TPUTS_TRACE("parm_insert_line"); 1550 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1551 } 1552 else if (scroll_reverse && top == miny && bot == maxy) 1553 { 1554 GoTo(top, 0); 1555 UpdateAttrs(blank); 1556 for (i = 0; i < n; i++) 1557 { 1558 TPUTS_TRACE("scroll_reverse"); 1559 tputs(scroll_reverse, 0, _nc_outch); 1560 } 1561 } 1562 else if (insert_line && bot == maxy) 1563 { 1564 GoTo(top, 0); 1565 UpdateAttrs(blank); 1566 for (i = 0; i < n; i++) 1567 { 1568 TPUTS_TRACE("insert_line"); 1569 tputs(insert_line, 0, _nc_outch); 1570 } 1571 } 1572 else 1573 return ERR; 1574 1575 #ifdef NCURSES_EXT_FUNCS 1576 if (FILL_BCE()) { 1577 for (i = 0; i < n; i++) { 1578 GoTo(top+i, 0); 1579 for (j = 0; j < screen_columns; j++) 1580 PutChar(blank); 1581 } 1582 } 1583 #endif 1584 return OK; 1585 } 1586 1587 /* scroll by using delete_line at del and insert_line at ins */ 1588 /* n > 0 */ 1589 static int scroll_idl(int n, int del, int ins, chtype blank) 1590 { 1591 int i; 1592 1593 if(!((parm_delete_line || delete_line) && (parm_insert_line || insert_line))) 1594 return ERR; 1595 1596 GoTo(del, 0); 1597 UpdateAttrs(blank); 1598 if (n == 1 && delete_line) 1599 { 1600 TPUTS_TRACE("delete_line"); 1601 tputs(delete_line, 0, _nc_outch); 1602 } 1603 else if (parm_delete_line) 1604 { 1605 TPUTS_TRACE("parm_delete_line"); 1606 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1607 } 1608 else /* if (delete_line) */ 1609 { 1610 for (i = 0; i < n; i++) 1611 { 1612 TPUTS_TRACE("delete_line"); 1613 tputs(delete_line, 0, _nc_outch); 1614 } 1615 } 1616 1617 GoTo(ins, 0); 1618 UpdateAttrs(blank); 1619 if (n == 1 && insert_line) 1620 { 1621 TPUTS_TRACE("insert_line"); 1622 tputs(insert_line, 0, _nc_outch); 1623 } 1624 else if (parm_insert_line) 1625 { 1626 TPUTS_TRACE("parm_insert_line"); 1627 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1628 } 1629 else /* if (insert_line) */ 1630 { 1631 for (i = 0; i < n; i++) 1632 { 1633 TPUTS_TRACE("insert_line"); 1634 tputs(insert_line, 0, _nc_outch); 1635 } 1636 } 1637 1638 return OK; 1639 } 1640 1641 int _nc_scrolln(int n, int top, int bot, int maxy) 1642 /* scroll region from top to bot by n lines */ 1643 { 1644 chtype blank=ClrBlank(stdscr); 1645 int i; 1646 bool cursor_saved=FALSE; 1647 int res; 1648 1649 TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy)); 1650 1651 #if USE_XMC_SUPPORT 1652 /* 1653 * If we scroll, we might remove a cookie. 1654 */ 1655 if (magic_cookie_glitch > 0) { 1656 return (ERR); 1657 } 1658 #endif 1659 1660 if (n > 0) /* scroll up (forward) */ 1661 { 1662 /* 1663 * Explicitly clear if stuff pushed off top of region might 1664 * be saved by the terminal. 1665 */ 1666 if (non_dest_scroll_region || (memory_above && top == 0)) { 1667 for (i = 0; i < n; i++) 1668 { 1669 GoTo(i, 0); 1670 ClrToEOL(BLANK); 1671 } 1672 } 1673 1674 res = scroll_csr_forward(n, top, bot, 0, maxy, blank); 1675 1676 if (res == ERR && change_scroll_region) 1677 { 1678 if ((((n==1 && scroll_forward) || parm_index) 1679 && (SP->_cursrow == bot || SP->_cursrow == bot-1)) 1680 && save_cursor && restore_cursor) 1681 { 1682 cursor_saved=TRUE; 1683 TPUTS_TRACE("save_cursor"); 1684 tputs(save_cursor, 0, _nc_outch); 1685 } 1686 TPUTS_TRACE("change_scroll_region"); 1687 tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch); 1688 if (cursor_saved) 1689 { 1690 TPUTS_TRACE("restore_cursor"); 1691 tputs(restore_cursor, 0, _nc_outch); 1692 } 1693 else 1694 { 1695 SP->_cursrow = SP->_curscol = -1; 1696 } 1697 1698 res = scroll_csr_forward(n, top, bot, top, bot, blank); 1699 1700 TPUTS_TRACE("change_scroll_region"); 1701 tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch); 1702 SP->_cursrow = SP->_curscol = -1; 1703 } 1704 1705 if (res == ERR && _nc_idlok) 1706 res = scroll_idl(n, top, bot-n+1, blank); 1707 } 1708 else /* (n < 0) - scroll down (backward) */ 1709 { 1710 /* 1711 * Do explicit clear to end of region if it's possible that the 1712 * terminal might hold on to stuff we push off the end. 1713 */ 1714 if (non_dest_scroll_region || (memory_below && bot == maxy)) 1715 { 1716 if (bot == maxy && clr_eos) 1717 { 1718 GoTo(maxy + n, 0); 1719 ClrToEOS(BLANK); 1720 } 1721 else if (clr_eol) 1722 { 1723 for (i = 0; i < -n; i++) 1724 { 1725 GoTo(maxy + n + i, 0); 1726 ClrToEOL(BLANK); 1727 } 1728 } 1729 } 1730 1731 res = scroll_csr_backward(-n, top, bot, 0, maxy, blank); 1732 1733 if (res == ERR && change_scroll_region) 1734 { 1735 if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top-1) 1736 && save_cursor && restore_cursor) 1737 { 1738 cursor_saved=TRUE; 1739 TPUTS_TRACE("save_cursor"); 1740 tputs(save_cursor, 0, _nc_outch); 1741 } 1742 TPUTS_TRACE("change_scroll_region"); 1743 tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch); 1744 if (cursor_saved) 1745 { 1746 TPUTS_TRACE("restore_cursor"); 1747 tputs(restore_cursor, 0, _nc_outch); 1748 } 1749 else 1750 { 1751 SP->_cursrow = SP->_curscol = -1; 1752 } 1753 1754 res = scroll_csr_backward(-n, top, bot, top, bot, blank); 1755 1756 TPUTS_TRACE("change_scroll_region"); 1757 tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch); 1758 SP->_cursrow = SP->_curscol = -1; 1759 } 1760 1761 if (res == ERR && _nc_idlok) 1762 res = scroll_idl(-n, bot+n+1, top, blank); 1763 } 1764 1765 if (res == ERR) 1766 return(ERR); 1767 1768 _nc_scroll_window(curscr, n, top, bot, blank); 1769 1770 /* shift hash values too - they can be reused */ 1771 _nc_scroll_oldhash(n, top, bot); 1772 1773 return(OK); 1774 } 1775 1776 1777 void _nc_screen_resume() 1778 { 1779 /* make sure terminal is in a sane known state */ 1780 SP->_current_attr = A_NORMAL; 1781 newscr->_clear = TRUE; 1782 1783 if (SP->_coloron == TRUE && orig_pair) 1784 putp(orig_pair); 1785 if (exit_attribute_mode) 1786 putp(exit_attribute_mode); 1787 else 1788 { 1789 /* turn off attributes */ 1790 if (exit_alt_charset_mode) 1791 putp(exit_alt_charset_mode); 1792 if (exit_standout_mode) 1793 putp(exit_standout_mode); 1794 if (exit_underline_mode) 1795 putp(exit_underline_mode); 1796 } 1797 if (exit_insert_mode) 1798 putp(exit_insert_mode); 1799 if (enter_am_mode && exit_am_mode) 1800 putp(auto_right_margin ? enter_am_mode : exit_am_mode); 1801 } 1802 1803 void _nc_screen_init() 1804 { 1805 _nc_screen_resume(); 1806 } 1807 1808 /* wrap up screen handling */ 1809 void _nc_screen_wrap() 1810 { 1811 UpdateAttrs(A_NORMAL); 1812 #ifdef NCURSES_EXT_FUNCS 1813 if (SP->_coloron 1814 && !SP->_default_color) { 1815 SP->_default_color = TRUE; 1816 _nc_do_color(0, FALSE, _nc_outch); 1817 SP->_default_color = FALSE; 1818 } 1819 #endif 1820 } 1821 1822 #if USE_XMC_SUPPORT 1823 void _nc_do_xmc_glitch(attr_t previous) 1824 { 1825 attr_t chg = XMC_CHANGES(previous ^ SP->_current_attr); 1826 1827 while (chg != 0) { 1828 if (chg & 1) { 1829 SP->_curscol += magic_cookie_glitch; 1830 if (SP->_curscol >= SP->_columns) 1831 wrap_cursor(); 1832 T(("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol)); 1833 } 1834 chg >>= 1; 1835 } 1836 } 1837 #endif /* USE_XMC_SUPPORT */ 1838