1 /**************************************************************************** 2 * Copyright (c) 1998,1999,2000 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 * lib_doupdate.c 37 * 38 * The routine doupdate() and its dependents. Also _nc_outstr(), 39 * so all physical output is concentrated here (except _nc_outch() 40 * in lib_tputs.c). 41 * 42 *-----------------------------------------------------------------*/ 43 44 #ifdef __BEOS__ 45 #include <OS.h> 46 #endif 47 48 #include <curses.priv.h> 49 50 #if defined(TRACE) && HAVE_SYS_TIMES_H && HAVE_TIMES 51 #define USE_TRACE_TIMES 1 52 #else 53 #define USE_TRACE_TIMES 0 54 #endif 55 56 #if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT 57 #include <sys/time.h> 58 #endif 59 60 #if USE_TRACE_TIMES 61 #include <sys/times.h> 62 #endif 63 64 #if USE_FUNC_POLL 65 #elif HAVE_SELECT 66 #if HAVE_SYS_SELECT_H 67 #include <sys/select.h> 68 #endif 69 #endif 70 71 #include <term.h> 72 73 MODULE_ID("$Id: tty_update.c,v 1.146 2000/10/07 01:11:44 tom Exp $") 74 75 /* 76 * This define controls the line-breakout optimization. Every once in a 77 * while during screen refresh, we want to check for input and abort the 78 * update if there's some waiting. CHECK_INTERVAL controls the number of 79 * changed lines to be emitted between input checks. 80 * 81 * Note: Input-check-and-abort is no longer done if the screen is being 82 * updated from scratch. This is a feature, not a bug. 83 */ 84 #define CHECK_INTERVAL 5 85 86 #define FILL_BCE() (SP->_coloron && !SP->_default_color && !back_color_erase) 87 88 /* 89 * Enable checking to see if doupdate and friends are tracking the true 90 * cursor position correctly. NOTE: this is a debugging hack which will 91 * work ONLY on ANSI-compatible terminals! 92 */ 93 /* #define POSITION_DEBUG */ 94 95 static inline chtype ClrBlank(WINDOW *win); 96 static int ClrBottom(int total); 97 static void ClearScreen(chtype blank); 98 static void ClrUpdate(void); 99 static void DelChar(int count); 100 static void InsStr(chtype * line, int count); 101 static void TransformLine(int const lineno); 102 103 #ifdef POSITION_DEBUG 104 /**************************************************************************** 105 * 106 * Debugging code. Only works on ANSI-standard terminals. 107 * 108 ****************************************************************************/ 109 110 static void 111 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 char *s; 116 int y, x; 117 118 if (!_nc_tracing || (expected_y < 0 && expected_x < 0)) 119 return; 120 121 _nc_flush(); 122 memset(buf, '\0', sizeof(buf)); 123 putp("\033[6n"); /* only works on ANSI-compatibles */ 124 _nc_flush(); 125 *(s = buf) = 0; 126 do { 127 int ask = sizeof(buf) - 1 - (s - buf); 128 int got = read(0, s, ask); 129 if (got == 0) 130 break; 131 s += got; 132 } while (strchr(buf, 'R') == 0); 133 _tracef("probe returned %s", _nc_visbuf(buf)); 134 135 /* try to interpret as a position report */ 136 if (sscanf(buf, "\033[%d;%dR", &y, &x) != 2) { 137 _tracef("position probe failed in %s", legend); 138 } else { 139 if (expected_x < 0) 140 expected_x = x - 1; 141 if (expected_y < 0) 142 expected_y = y - 1; 143 if (y - 1 != expected_y || x - 1 != expected_x) { 144 beep(); 145 tputs(tparm("\033[%d;%dH", expected_y + 1, expected_x + 1), 1, _nc_outch); 146 _tracef("position seen (%d, %d) doesn't match expected one (%d, %d) in %s", 147 y - 1, x - 1, expected_y, expected_x, legend); 148 } else { 149 _tracef("position matches OK in %s", legend); 150 } 151 } 152 } 153 #else 154 #define position_check(expected_y, expected_x, legend) /* nothing */ 155 #endif /* POSITION_DEBUG */ 156 157 /**************************************************************************** 158 * 159 * Optimized update code 160 * 161 ****************************************************************************/ 162 163 static inline void 164 GoTo(int const row, int const col) 165 { 166 chtype oldattr = SP->_current_attr; 167 168 TR(TRACE_MOVE, ("GoTo(%d, %d) from (%d, %d)", 169 row, col, SP->_cursrow, SP->_curscol)); 170 171 position_check(SP->_cursrow, SP->_curscol, "GoTo"); 172 173 /* 174 * Force restore even if msgr is on when we're in an alternate 175 * character set -- these have a strong tendency to screw up the 176 * CR & LF used for local character motions! 177 */ 178 if ((oldattr & A_ALTCHARSET) 179 || (oldattr && !move_standout_mode)) { 180 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move", 181 oldattr, _traceattr(oldattr))); 182 vidattr(A_NORMAL); 183 } 184 185 mvcur(SP->_cursrow, SP->_curscol, row, col); 186 SP->_cursrow = row; 187 SP->_curscol = col; 188 position_check(SP->_cursrow, SP->_curscol, "GoTo2"); 189 } 190 191 static inline void 192 PutAttrChar(chtype ch) 193 { 194 int data; 195 196 if (tilde_glitch && (TextOf(ch) == '~')) 197 ch = ('`' | AttrOf(ch)); 198 199 TR(TRACE_CHARPUT, ("PutAttrChar(%s) at (%d, %d)", 200 _tracechtype(ch), 201 SP->_cursrow, SP->_curscol)); 202 UpdateAttrs(ch); 203 data = TextOf(ch); 204 if (SP->_outch != 0) { 205 SP->_outch(data); 206 } else { 207 putc(data, SP->_ofp); /* macro's fastest... */ 208 #ifdef TRACE 209 _nc_outchars++; 210 #endif /* TRACE */ 211 } 212 SP->_curscol++; 213 if (char_padding) { 214 TPUTS_TRACE("char_padding"); 215 putp(char_padding); 216 } 217 } 218 219 static bool 220 check_pending(void) 221 /* check for pending input */ 222 { 223 bool have_pending = FALSE; 224 225 /* 226 * Only carry out this check when the flag is zero, otherwise we'll 227 * have the refreshing slow down drastically (or stop) if there's an 228 * unread character available. 229 */ 230 if (SP->_fifohold != 0) 231 return FALSE; 232 233 if (SP->_checkfd >= 0) { 234 #if USE_FUNC_POLL 235 struct pollfd fds[1]; 236 fds[0].fd = SP->_checkfd; 237 fds[0].events = POLLIN; 238 if (poll(fds, 1, 0) > 0) { 239 have_pending = TRUE; 240 } 241 #elif defined(__BEOS__) 242 /* 243 * BeOS's select() is declared in socket.h, so the configure script does 244 * not see it. That's just as well, since that function works only for 245 * sockets. This (using snooze and ioctl) was distilled from Be's patch 246 * for ncurses which uses a separate thread to simulate select(). 247 * 248 * FIXME: the return values from the ioctl aren't very clear if we get 249 * interrupted. 250 */ 251 int n = 0; 252 int howmany = ioctl(0, 'ichr', &n); 253 if (howmany >= 0 && n > 0) { 254 have_pending = TRUE; 255 } 256 #elif HAVE_SELECT 257 fd_set fdset; 258 struct timeval ktimeout; 259 260 ktimeout.tv_sec = 261 ktimeout.tv_usec = 0; 262 263 FD_ZERO(&fdset); 264 FD_SET(SP->_checkfd, &fdset); 265 if (select(SP->_checkfd + 1, &fdset, NULL, NULL, &ktimeout) != 0) { 266 have_pending = TRUE; 267 } 268 #endif 269 } 270 if (have_pending) { 271 SP->_fifohold = 5; 272 _nc_flush(); 273 } 274 return FALSE; 275 } 276 277 /* 278 * No one supports recursive inline functions. However, gcc is quieter if we 279 * instantiate the recursive part separately. 280 */ 281 #if CC_HAS_INLINE_FUNCS 282 static void callPutChar(chtype const); 283 #else 284 #define callPutChar(ch) PutChar(ch) 285 #endif 286 287 static inline void PutChar(chtype const ch); /* forward declaration */ 288 289 /* put char at lower right corner */ 290 static void 291 PutCharLR(chtype const ch) 292 { 293 if (!auto_right_margin) { 294 /* we can put the char directly */ 295 PutAttrChar(ch); 296 } else if (enter_am_mode && exit_am_mode) { 297 /* we can suppress automargin */ 298 TPUTS_TRACE("exit_am_mode"); 299 putp(exit_am_mode); 300 301 PutAttrChar(ch); 302 SP->_curscol--; 303 position_check(SP->_cursrow, SP->_curscol, "exit_am_mode"); 304 305 TPUTS_TRACE("enter_am_mode"); 306 putp(enter_am_mode); 307 } else if ((enter_insert_mode && exit_insert_mode) 308 || insert_character || parm_ich) { 309 GoTo(screen_lines - 1, screen_columns - 2); 310 callPutChar(ch); 311 GoTo(screen_lines - 1, screen_columns - 2); 312 InsStr(newscr->_line[screen_lines - 1].text + screen_columns - 2, 1); 313 } 314 } 315 316 static void 317 wrap_cursor(void) 318 { 319 if (eat_newline_glitch) { 320 /* 321 * xenl can manifest two different ways. The vt100 322 * way is that, when you'd expect the cursor to wrap, 323 * it stays hung at the right margin (on top of the 324 * character just emitted) and doesn't wrap until the 325 * *next* graphic char is emitted. The c100 way is 326 * to ignore LF received just after an am wrap. 327 * 328 * An aggressive way to handle this would be to 329 * emit CR/LF after the char and then assume the wrap 330 * is done, you're on the first position of the next 331 * line, and the terminal out of its weird state. 332 * Here it's safe to just tell the code that the 333 * cursor is in hyperspace and let the next mvcur() 334 * call straighten things out. 335 */ 336 SP->_curscol = -1; 337 SP->_cursrow = -1; 338 } else if (auto_right_margin) { 339 SP->_curscol = 0; 340 SP->_cursrow++; 341 } else { 342 SP->_curscol--; 343 } 344 position_check(SP->_cursrow, SP->_curscol, "wrap_cursor"); 345 } 346 347 static inline void 348 PutChar(chtype const ch) 349 /* insert character, handling automargin stuff */ 350 { 351 if (SP->_cursrow == screen_lines - 1 && SP->_curscol == screen_columns - 1) 352 PutCharLR(ch); 353 else 354 PutAttrChar(ch); 355 356 if (SP->_curscol >= screen_columns) 357 wrap_cursor(); 358 359 position_check(SP->_cursrow, SP->_curscol, "PutChar"); 360 } 361 362 /* 363 * Check whether the given character can be output by clearing commands. This 364 * includes test for being a space and not including any 'bad' attributes, such 365 * as A_REVERSE. All attribute flags which don't affect appearance of a space 366 * or can be output by clearing (A_COLOR in case of bce-terminal) are excluded. 367 */ 368 static inline bool 369 can_clear_with(chtype ch) 370 { 371 if (!back_color_erase && SP->_coloron) { 372 if (ch & A_COLOR) 373 return FALSE; 374 #if NCURSES_EXT_FUNCS 375 if (!SP->_default_color) 376 return FALSE; 377 if (SP->_default_fg != C_MASK || SP->_default_bg != C_MASK) 378 return FALSE; 379 #endif 380 } 381 return ((ch & ~(NONBLANK_ATTR | A_COLOR)) == BLANK); 382 } 383 384 /* 385 * Issue a given span of characters from an array. 386 * Must be functionally equivalent to: 387 * for (i = 0; i < num; i++) 388 * PutChar(ntext[i]); 389 * but can leave the cursor positioned at the middle of the interval. 390 * 391 * Returns: 0 - cursor is at the end of interval 392 * 1 - cursor is somewhere in the middle 393 * 394 * This code is optimized using ech and rep. 395 */ 396 static int 397 EmitRange(const chtype * ntext, int num) 398 { 399 int i; 400 401 if (erase_chars || repeat_char) { 402 while (num > 0) { 403 int runcount; 404 chtype ntext0; 405 406 while (num > 1 && ntext[0] != ntext[1]) { 407 PutChar(ntext[0]); 408 ntext++; 409 num--; 410 } 411 ntext0 = ntext[0]; 412 if (num == 1) { 413 PutChar(ntext0); 414 return 0; 415 } 416 runcount = 2; 417 418 while (runcount < num && ntext[runcount] == ntext0) 419 runcount++; 420 421 /* 422 * The cost expression in the middle isn't exactly right. 423 * _cup_ch_cost is an upper bound on the cost for moving to the 424 * end of the erased area, but not the cost itself (which we 425 * can't compute without emitting the move). This may result 426 * in erase_chars not getting used in some situations for 427 * which it would be marginally advantageous. 428 */ 429 if (erase_chars 430 && runcount > SP->_ech_cost + SP->_cup_ch_cost 431 && can_clear_with(ntext0)) { 432 UpdateAttrs(ntext0); 433 putp(tparm(erase_chars, runcount)); 434 435 /* 436 * If this is the last part of the given interval, 437 * don't bother moving cursor, since it can be the 438 * last update on the line. 439 */ 440 if (runcount < num) { 441 GoTo(SP->_cursrow, SP->_curscol + runcount); 442 } else { 443 return 1; /* cursor stays in the middle */ 444 } 445 } else if (repeat_char && runcount > SP->_rep_cost) { 446 bool wrap_possible = (SP->_curscol + runcount >= screen_columns); 447 int rep_count = runcount; 448 449 if (wrap_possible) 450 rep_count--; 451 452 UpdateAttrs(ntext0); 453 putp(tparm(repeat_char, TextOf(ntext0), rep_count)); 454 SP->_curscol += rep_count; 455 456 if (wrap_possible) 457 PutChar(ntext0); 458 } else { 459 for (i = 0; i < runcount; i++) 460 PutChar(ntext[i]); 461 } 462 ntext += runcount; 463 num -= runcount; 464 } 465 return 0; 466 } 467 468 for (i = 0; i < num; i++) 469 PutChar(ntext[i]); 470 return 0; 471 } 472 473 /* 474 * Output the line in the given range [first .. last] 475 * 476 * If there's a run of identical characters that's long enough to justify 477 * cursor movement, use that also. 478 * 479 * Returns: same as EmitRange 480 */ 481 static int 482 PutRange( 483 const chtype * otext, 484 const chtype * ntext, 485 int row, 486 int first, int last) 487 { 488 int j, run; 489 490 TR(TRACE_CHARPUT, ("PutRange(%p, %p, %d, %d, %d)", 491 otext, ntext, row, first, last)); 492 493 if (otext != ntext 494 && (last - first + 1) > SP->_inline_cost) { 495 for (j = first, run = 0; j <= last; j++) { 496 if (otext[j] == ntext[j]) { 497 run++; 498 } else { 499 if (run > SP->_inline_cost) { 500 int before_run = (j - run); 501 EmitRange(ntext + first, before_run - first); 502 GoTo(row, first = j); 503 } 504 run = 0; 505 } 506 } 507 } 508 return EmitRange(ntext + first, last - first + 1); 509 } 510 511 #if CC_HAS_INLINE_FUNCS 512 static void 513 callPutChar(chtype const ch) 514 { 515 PutChar(ch); 516 } 517 #endif 518 519 /* leave unbracketed here so 'indent' works */ 520 #define MARK_NOCHANGE(win,row) \ 521 win->_line[row].firstchar = _NOCHANGE; \ 522 win->_line[row].lastchar = _NOCHANGE; \ 523 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row) 524 525 int 526 doupdate(void) 527 { 528 int i; 529 int nonempty; 530 #if USE_TRACE_TIMES 531 struct tms before, after; 532 #endif /* USE_TRACE_TIMES */ 533 534 T((T_CALLED("doupdate()"))); 535 536 #ifdef TRACE 537 if (_nc_tracing & TRACE_UPDATE) { 538 if (curscr->_clear) 539 _tracef("curscr is clear"); 540 else 541 _tracedump("curscr", curscr); 542 _tracedump("newscr", newscr); 543 } 544 #endif /* TRACE */ 545 546 _nc_signal_handler(FALSE); 547 548 if (SP->_fifohold) 549 SP->_fifohold--; 550 551 #if USE_SIZECHANGE 552 if (SP->_endwin || SP->_sig_winch) { 553 /* 554 * This is a transparent extension: XSI does not address it, 555 * and applications need not know that ncurses can do it. 556 * 557 * Check if the terminal size has changed while curses was off 558 * (this can happen in an xterm, for example), and resize the 559 * ncurses data structures accordingly. 560 */ 561 _nc_update_screensize(); 562 } 563 #endif 564 565 if (SP->_endwin) { 566 567 T(("coming back from shell mode")); 568 reset_prog_mode(); 569 570 _nc_mvcur_resume(); 571 _nc_screen_resume(); 572 SP->_mouse_resume(SP); 573 574 SP->_endwin = FALSE; 575 } 576 #if USE_TRACE_TIMES 577 /* zero the metering machinery */ 578 _nc_outchars = 0; 579 (void) times(&before); 580 #endif /* USE_TRACE_TIMES */ 581 582 /* 583 * This is the support for magic-cookie terminals. The 584 * theory: we scan the virtual screen looking for attribute 585 * turnons. Where we find one, check to make sure it's 586 * realizable by seeing if the required number of 587 * un-attributed blanks are present before and after the 588 * attributed range; try to shift the range boundaries over 589 * blanks (not changing the screen display) so this becomes 590 * true. If it is, shift the beginning attribute change 591 * appropriately (the end one, if we've gotten this far, is 592 * guaranteed room for its cookie). If not, nuke the added 593 * attributes out of the span. 594 */ 595 #if USE_XMC_SUPPORT 596 if (magic_cookie_glitch > 0) { 597 int j, k; 598 attr_t rattr = A_NORMAL; 599 600 for (i = 0; i < screen_lines; i++) { 601 for (j = 0; j < screen_columns; j++) { 602 bool failed = FALSE; 603 chtype turnon = AttrOf(newscr->_line[i].text[j]) & ~rattr; 604 605 /* is an attribute turned on here? */ 606 if (turnon == 0) { 607 rattr = AttrOf(newscr->_line[i].text[j]); 608 continue; 609 } 610 611 TR(TRACE_ATTRS, ("At (%d, %d): from %s...", i, j, _traceattr(rattr))); 612 TR(TRACE_ATTRS, ("...to %s", _traceattr(turnon))); 613 614 /* 615 * If the attribute change location is a blank with a 616 * "safe" attribute, undo the attribute turnon. This may 617 * ensure there's enough room to set the attribute before 618 * the first non-blank in the run. 619 */ 620 #define SAFE(a) (!((a) & (chtype)~NONBLANK_ATTR)) 621 if (TextOf(newscr->_line[i].text[j]) == ' ' && SAFE(turnon)) { 622 newscr->_line[i].text[j] &= ~turnon; 623 continue; 624 } 625 626 /* check that there's enough room at start of span */ 627 for (k = 1; k <= magic_cookie_glitch; k++) { 628 if (j - k < 0 629 || TextOf(newscr->_line[i].text[j - k]) != ' ' 630 || !SAFE(AttrOf(newscr->_line[i].text[j - k]))) 631 failed = TRUE; 632 } 633 if (!failed) { 634 bool end_onscreen = FALSE; 635 int m, n = j; 636 637 /* find end of span, if it's onscreen */ 638 for (m = i; m < screen_lines; m++) { 639 for (; n < screen_columns; n++) { 640 if (AttrOf(newscr->_line[m].text[n]) == rattr) { 641 end_onscreen = TRUE; 642 TR(TRACE_ATTRS, 643 ("Range attributed with %s ends at (%d, %d)", 644 _traceattr(turnon), m, n)); 645 goto foundit; 646 } 647 } 648 n = 0; 649 } 650 TR(TRACE_ATTRS, 651 ("Range attributed with %s ends offscreen", 652 _traceattr(turnon))); 653 foundit:; 654 655 if (end_onscreen) { 656 chtype *lastline = newscr->_line[m].text; 657 658 /* 659 * If there are safely-attributed blanks at the 660 * end of the range, shorten the range. This will 661 * help ensure that there is enough room at end 662 * of span. 663 */ 664 while (n >= 0 665 && TextOf(lastline[n]) == ' ' 666 && SAFE(AttrOf(lastline[n]))) 667 lastline[n--] &= ~turnon; 668 669 /* check that there's enough room at end of span */ 670 for (k = 1; k <= magic_cookie_glitch; k++) 671 if (n + k >= screen_columns 672 || TextOf(lastline[n + k]) != ' ' 673 || !SAFE(AttrOf(lastline[n + k]))) 674 failed = TRUE; 675 } 676 } 677 678 if (failed) { 679 int p, q = j; 680 681 TR(TRACE_ATTRS, 682 ("Clearing %s beginning at (%d, %d)", 683 _traceattr(turnon), i, j)); 684 685 /* turn off new attributes over span */ 686 for (p = i; p < screen_lines; p++) { 687 for (; q < screen_columns; q++) { 688 if (AttrOf(newscr->_line[p].text[q]) == rattr) 689 goto foundend; 690 newscr->_line[p].text[q] &= ~turnon; 691 } 692 q = 0; 693 } 694 foundend:; 695 } else { 696 TR(TRACE_ATTRS, 697 ("Cookie space for %s found before (%d, %d)", 698 _traceattr(turnon), i, j)); 699 700 /* 701 * back up the start of range so there's room 702 * for cookies before the first nonblank character 703 */ 704 for (k = 1; k <= magic_cookie_glitch; k++) 705 newscr->_line[i].text[j - k] |= turnon; 706 } 707 708 rattr = AttrOf(newscr->_line[i].text[j]); 709 } 710 } 711 712 #ifdef TRACE 713 /* show altered highlights after magic-cookie check */ 714 if (_nc_tracing & TRACE_UPDATE) { 715 _tracef("After magic-cookie check..."); 716 _tracedump("newscr", newscr); 717 } 718 #endif /* TRACE */ 719 } 720 #endif /* USE_XMC_SUPPORT */ 721 722 nonempty = 0; 723 if (curscr->_clear || newscr->_clear) { /* force refresh ? */ 724 TR(TRACE_UPDATE, ("clearing and updating from scratch")); 725 ClrUpdate(); 726 curscr->_clear = FALSE; /* reset flag */ 727 newscr->_clear = FALSE; /* reset flag */ 728 } else { 729 int changedlines = CHECK_INTERVAL; 730 731 if (check_pending()) 732 goto cleanup; 733 734 nonempty = min(screen_lines, newscr->_maxy + 1); 735 736 if (SP->_scrolling) { 737 _nc_scroll_optimize(); 738 } 739 740 nonempty = ClrBottom(nonempty); 741 742 TR(TRACE_UPDATE, ("Transforming lines, nonempty %d", nonempty)); 743 for (i = 0; i < nonempty; i++) { 744 /* 745 * Here is our line-breakout optimization. 746 */ 747 if (changedlines == CHECK_INTERVAL) { 748 if (check_pending()) 749 goto cleanup; 750 changedlines = 0; 751 } 752 753 /* 754 * newscr->line[i].firstchar is normally set 755 * by wnoutrefresh. curscr->line[i].firstchar 756 * is normally set by _nc_scroll_window in the 757 * vertical-movement optimization code, 758 */ 759 if (newscr->_line[i].firstchar != _NOCHANGE 760 || curscr->_line[i].firstchar != _NOCHANGE) { 761 TransformLine(i); 762 changedlines++; 763 } 764 765 /* mark line changed successfully */ 766 if (i <= newscr->_maxy) { 767 MARK_NOCHANGE(newscr, i) 768 } 769 if (i <= curscr->_maxy) { 770 MARK_NOCHANGE(curscr, i) 771 } 772 } 773 } 774 775 /* put everything back in sync */ 776 for (i = nonempty; i <= newscr->_maxy; i++) { 777 MARK_NOCHANGE(newscr, i) 778 } 779 for (i = nonempty; i <= curscr->_maxy; i++) { 780 MARK_NOCHANGE(curscr, i) 781 } 782 783 if (!newscr->_leaveok) { 784 curscr->_curx = newscr->_curx; 785 curscr->_cury = newscr->_cury; 786 787 GoTo(curscr->_cury, curscr->_curx); 788 } 789 790 cleanup: 791 /* 792 * Keep the physical screen in normal mode in case we get other 793 * processes writing to the screen. 794 */ 795 UpdateAttrs(A_NORMAL); 796 797 _nc_flush(); 798 curscr->_attrs = newscr->_attrs; 799 800 #if USE_TRACE_TIMES 801 (void) times(&after); 802 TR(TRACE_TIMES, 803 ("Update cost: %ld chars, %ld clocks system time, %ld clocks user time", 804 _nc_outchars, 805 after.tms_stime - before.tms_stime, 806 after.tms_utime - before.tms_utime)); 807 #endif /* USE_TRACE_TIMES */ 808 809 _nc_signal_handler(TRUE); 810 811 returnCode(OK); 812 } 813 814 /* 815 * ClrBlank(win) 816 * 817 * Returns the attributed character that corresponds to the "cleared" 818 * screen. If the terminal has the back-color-erase feature, this will be 819 * colored according to the wbkgd() call. 820 * 821 * We treat 'curscr' specially because it isn't supposed to be set directly 822 * in the wbkgd() call. Assume 'stdscr' for this case. 823 */ 824 #define BCE_ATTRS (A_NORMAL|A_COLOR) 825 #define BCE_BKGD(win) (((win) == curscr ? stdscr : (win))->_bkgd) 826 827 static inline chtype 828 ClrBlank(WINDOW *win) 829 { 830 chtype blank = BLANK; 831 if (back_color_erase) 832 blank |= (BCE_BKGD(win) & BCE_ATTRS); 833 return blank; 834 } 835 836 /* 837 ** ClrUpdate() 838 ** 839 ** Update by clearing and redrawing the entire screen. 840 ** 841 */ 842 843 static void 844 ClrUpdate(void) 845 { 846 int i; 847 chtype blank = ClrBlank(stdscr); 848 int nonempty = min(screen_lines, newscr->_maxy + 1); 849 850 TR(TRACE_UPDATE, ("ClrUpdate() called")); 851 852 ClearScreen(blank); 853 854 TR(TRACE_UPDATE, ("updating screen from scratch")); 855 856 nonempty = ClrBottom(nonempty); 857 858 for (i = 0; i < nonempty; i++) 859 TransformLine(i); 860 } 861 862 /* 863 ** ClrToEOL(blank) 864 ** 865 ** Clear to end of current line, starting at the cursor position 866 */ 867 868 static void 869 ClrToEOL(chtype blank, bool needclear) 870 { 871 int j; 872 873 if (curscr != 0 874 && SP->_cursrow >= 0) { 875 for (j = SP->_curscol; j < screen_columns; j++) { 876 if (j >= 0) { 877 chtype *cp = &(curscr->_line[SP->_cursrow].text[j]); 878 879 if (*cp != blank) { 880 *cp = blank; 881 needclear = TRUE; 882 } 883 } 884 } 885 } else { 886 needclear = TRUE; 887 } 888 889 if (needclear) { 890 UpdateAttrs(blank); 891 TPUTS_TRACE("clr_eol"); 892 if (SP->_el_cost > (screen_columns - SP->_curscol)) { 893 int count = (screen_columns - SP->_curscol); 894 while (count-- > 0) 895 PutChar(blank); 896 } else { 897 putp(clr_eol); 898 } 899 } 900 } 901 902 /* 903 ** ClrToEOS(blank) 904 ** 905 ** Clear to end of screen, starting at the cursor position 906 */ 907 908 static void 909 ClrToEOS(chtype blank) 910 { 911 int row, col; 912 913 row = SP->_cursrow; 914 col = SP->_curscol; 915 916 UpdateAttrs(blank); 917 TPUTS_TRACE("clr_eos"); 918 tputs(clr_eos, screen_lines - row, _nc_outch); 919 920 while (col < screen_columns) 921 curscr->_line[row].text[col++] = blank; 922 923 for (row++; row < screen_lines; row++) { 924 for (col = 0; col < screen_columns; col++) 925 curscr->_line[row].text[col] = blank; 926 } 927 } 928 929 /* 930 * ClrBottom(total) 931 * 932 * Test if clearing the end of the screen would satisfy part of the 933 * screen-update. Do this by scanning backwards through the lines in the 934 * screen, checking if each is blank, and one or more are changed. 935 */ 936 static int 937 ClrBottom(int total) 938 { 939 int row; 940 int col; 941 int top = total; 942 int last = min(screen_columns, newscr->_maxx + 1); 943 chtype blank = ClrBlank(stdscr); 944 bool ok; 945 946 if (clr_eos && can_clear_with(blank)) { 947 948 for (row = total - 1; row >= 0; row--) { 949 for (col = 0, ok = TRUE; ok && col < last; col++) { 950 ok = (newscr->_line[row].text[col] == blank); 951 } 952 if (!ok) 953 break; 954 955 for (col = 0; ok && col < last; col++) { 956 ok = (curscr->_line[row].text[col] == blank); 957 } 958 if (!ok) 959 top = row; 960 } 961 962 /* don't use clr_eos for just one line if clr_eol available */ 963 if (top < total - 1 || (top < total && !clr_eol && !clr_bol)) { 964 GoTo(top, 0); 965 ClrToEOS(blank); 966 total = top; 967 if (SP->oldhash && SP->newhash) { 968 for (row = top; row < screen_lines; row++) 969 SP->oldhash[row] = SP->newhash[row]; 970 } 971 } 972 } 973 return total; 974 } 975 976 /* 977 ** TransformLine(lineno) 978 ** 979 ** Transform the given line in curscr to the one in newscr, using 980 ** Insert/Delete Character if _nc_idcok && has_ic(). 981 ** 982 ** firstChar = position of first different character in line 983 ** oLastChar = position of last different character in old line 984 ** nLastChar = position of last different character in new line 985 ** 986 ** move to firstChar 987 ** overwrite chars up to min(oLastChar, nLastChar) 988 ** if oLastChar < nLastChar 989 ** insert newLine[oLastChar+1..nLastChar] 990 ** else 991 ** delete oLastChar - nLastChar spaces 992 */ 993 994 static void 995 TransformLine(int const lineno) 996 { 997 int firstChar, oLastChar, nLastChar; 998 chtype *newLine = newscr->_line[lineno].text; 999 chtype *oldLine = curscr->_line[lineno].text; 1000 int n; 1001 bool attrchanged = FALSE; 1002 1003 TR(TRACE_UPDATE, ("TransformLine(%d) called", lineno)); 1004 1005 /* copy new hash value to old one */ 1006 if (SP->oldhash && SP->newhash) 1007 SP->oldhash[lineno] = SP->newhash[lineno]; 1008 1009 #define ColorOf(n) ((n) & A_COLOR) 1010 #define unColor(n) ((n) & ALL_BUT_COLOR) 1011 /* 1012 * If we have colors, there is the possibility of having two color pairs 1013 * that display as the same colors. For instance, Lynx does this. Check 1014 * for this case, and update the old line with the new line's colors when 1015 * they are equivalent. 1016 */ 1017 if (SP->_coloron) { 1018 chtype oldColor; 1019 chtype newColor; 1020 int oldPair; 1021 int newPair; 1022 1023 for (n = 0; n < screen_columns; n++) { 1024 if (newLine[n] != oldLine[n]) { 1025 oldColor = ColorOf(oldLine[n]); 1026 newColor = ColorOf(newLine[n]); 1027 if (oldColor != newColor 1028 && unColor(oldLine[n]) == unColor(newLine[n])) { 1029 oldPair = PAIR_NUMBER(oldColor); 1030 newPair = PAIR_NUMBER(newColor); 1031 if (oldPair < COLOR_PAIRS 1032 && newPair < COLOR_PAIRS 1033 && SP->_color_pairs[oldPair] == SP->_color_pairs[newPair]) { 1034 oldLine[n] &= ~A_COLOR; 1035 oldLine[n] |= ColorOf(newLine[n]); 1036 } 1037 } 1038 } 1039 } 1040 } 1041 1042 if (ceol_standout_glitch && clr_eol) { 1043 firstChar = 0; 1044 while (firstChar < screen_columns) { 1045 if (AttrOf(newLine[firstChar]) != AttrOf(oldLine[firstChar])) 1046 attrchanged = TRUE; 1047 firstChar++; 1048 } 1049 } 1050 1051 firstChar = 0; 1052 1053 if (attrchanged) { /* we may have to disregard the whole line */ 1054 GoTo(lineno, firstChar); 1055 ClrToEOL(ClrBlank(curscr), FALSE); 1056 PutRange(oldLine, newLine, lineno, 0, (screen_columns - 1)); 1057 #if USE_XMC_SUPPORT 1058 1059 #define NEW(r,c) newscr->_line[r].text[c] 1060 #define xmc_turn_on(a,b) ((((a)^(b)) & ~(a) & SP->_xmc_triggers) != 0) 1061 #define xmc_turn_off(a,b) xmc_turn_on(b,a) 1062 1063 /* 1064 * This is a very simple loop to paint characters which may have the 1065 * magic cookie glitch embedded. It doesn't know much about video 1066 * attributes which are continued from one line to the next. It 1067 * assumes that we have filtered out requests for attribute changes 1068 * that do not get mapped to blank positions. 1069 * 1070 * FIXME: we are not keeping track of where we put the cookies, so this 1071 * will work properly only once, since we may overwrite a cookie in a 1072 * following operation. 1073 */ 1074 } else if (magic_cookie_glitch > 0) { 1075 GoTo(lineno, firstChar); 1076 for (n = 0; n < screen_columns; n++) { 1077 int m = n + magic_cookie_glitch; 1078 1079 /* check for turn-on: 1080 * If we are writing an attributed blank, where the 1081 * previous cell is not attributed. 1082 */ 1083 if (TextOf(newLine[n]) == ' ' 1084 && ((n > 0 1085 && xmc_turn_on(newLine[n - 1], newLine[n])) 1086 || (n == 0 1087 && lineno > 0 1088 && xmc_turn_on(NEW(lineno - 1, screen_columns - 1), 1089 newLine[n])))) { 1090 n = m; 1091 } 1092 1093 PutChar(newLine[n]); 1094 1095 /* check for turn-off: 1096 * If we are writing an attributed non-blank, where the 1097 * next cell is blank, and not attributed. 1098 */ 1099 if (TextOf(newLine[n]) != ' ' 1100 && ((n + 1 < screen_columns 1101 && xmc_turn_off(newLine[n], newLine[n + 1])) 1102 || (n + 1 >= screen_columns 1103 && lineno + 1 < screen_lines 1104 && xmc_turn_off(newLine[n], NEW(lineno + 1, 0))))) { 1105 n = m; 1106 } 1107 1108 } 1109 #undef NEW 1110 #endif 1111 } else { 1112 chtype blank; 1113 1114 /* find the first differing character */ 1115 while (firstChar < screen_columns && 1116 newLine[firstChar] == oldLine[firstChar]) 1117 firstChar++; 1118 1119 /* if there wasn't one, we're done */ 1120 if (firstChar >= screen_columns) 1121 return; 1122 1123 /* it may be cheap to clear leading whitespace with clr_bol */ 1124 if (clr_bol && can_clear_with(blank = newLine[0])) { 1125 int oFirstChar, nFirstChar; 1126 1127 for (oFirstChar = 0; oFirstChar < screen_columns; oFirstChar++) 1128 if (oldLine[oFirstChar] != blank) 1129 break; 1130 for (nFirstChar = 0; nFirstChar < screen_columns; nFirstChar++) 1131 if (newLine[nFirstChar] != blank) 1132 break; 1133 1134 if (nFirstChar > oFirstChar + SP->_el1_cost) { 1135 if (nFirstChar >= screen_columns && SP->_el_cost <= SP->_el1_cost) { 1136 GoTo(lineno, 0); 1137 UpdateAttrs(blank); 1138 TPUTS_TRACE("clr_eol"); 1139 putp(clr_eol); 1140 } else { 1141 GoTo(lineno, nFirstChar - 1); 1142 UpdateAttrs(blank); 1143 TPUTS_TRACE("clr_bol"); 1144 putp(clr_bol); 1145 } 1146 1147 while (firstChar < nFirstChar) 1148 oldLine[firstChar++] = blank; 1149 1150 if (firstChar >= screen_columns) 1151 return; 1152 } 1153 } 1154 1155 blank = newLine[screen_columns - 1]; 1156 1157 if (!can_clear_with(blank)) { 1158 /* find the last differing character */ 1159 nLastChar = screen_columns - 1; 1160 1161 while (nLastChar > firstChar 1162 && newLine[nLastChar] == oldLine[nLastChar]) 1163 nLastChar--; 1164 1165 if (nLastChar >= firstChar) { 1166 GoTo(lineno, firstChar); 1167 PutRange(oldLine, newLine, lineno, firstChar, nLastChar); 1168 memcpy(oldLine + firstChar, 1169 newLine + firstChar, 1170 (nLastChar - firstChar + 1) * sizeof(chtype)); 1171 } 1172 return; 1173 } 1174 1175 /* find last non-blank character on old line */ 1176 oLastChar = screen_columns - 1; 1177 while (oLastChar > firstChar && oldLine[oLastChar] == blank) 1178 oLastChar--; 1179 1180 /* find last non-blank character on new line */ 1181 nLastChar = screen_columns - 1; 1182 while (nLastChar > firstChar && newLine[nLastChar] == blank) 1183 nLastChar--; 1184 1185 if ((nLastChar == firstChar) 1186 && (SP->_el_cost < (oLastChar - nLastChar))) { 1187 GoTo(lineno, firstChar); 1188 if (newLine[firstChar] != blank) 1189 PutChar(newLine[firstChar]); 1190 ClrToEOL(blank, FALSE); 1191 } else if ((nLastChar != oLastChar) 1192 && (newLine[nLastChar] != oldLine[oLastChar] 1193 || !(_nc_idcok && has_ic()))) { 1194 GoTo(lineno, firstChar); 1195 if ((oLastChar - nLastChar) > SP->_el_cost) { 1196 if (PutRange(oldLine, newLine, lineno, firstChar, nLastChar)) 1197 GoTo(lineno, nLastChar + 1); 1198 ClrToEOL(blank, FALSE); 1199 } else { 1200 n = max(nLastChar, oLastChar); 1201 PutRange(oldLine, newLine, lineno, firstChar, n); 1202 } 1203 } else { 1204 int nLastNonblank = nLastChar; 1205 int oLastNonblank = oLastChar; 1206 1207 /* find the last characters that really differ */ 1208 while (newLine[nLastChar] == oldLine[oLastChar]) { 1209 if (nLastChar != 0 1210 && oLastChar != 0) { 1211 nLastChar--; 1212 oLastChar--; 1213 } else { 1214 break; 1215 } 1216 } 1217 1218 n = min(oLastChar, nLastChar); 1219 if (n >= firstChar) { 1220 GoTo(lineno, firstChar); 1221 PutRange(oldLine, newLine, lineno, firstChar, n); 1222 } 1223 1224 if (oLastChar < nLastChar) { 1225 int m = max(nLastNonblank, oLastNonblank); 1226 GoTo(lineno, n + 1); 1227 if (InsCharCost(nLastChar - oLastChar) 1228 > (m - n)) { 1229 PutRange(oldLine, newLine, lineno, n + 1, m); 1230 } else { 1231 InsStr(&newLine[n + 1], nLastChar - oLastChar); 1232 } 1233 } else if (oLastChar > nLastChar) { 1234 GoTo(lineno, n + 1); 1235 if (DelCharCost(oLastChar - nLastChar) 1236 > SP->_el_cost + nLastNonblank - (n + 1)) { 1237 if (PutRange(oldLine, newLine, lineno, 1238 n + 1, nLastNonblank)) 1239 GoTo(lineno, nLastNonblank + 1); 1240 ClrToEOL(blank, FALSE); 1241 } else { 1242 /* 1243 * The delete-char sequence will 1244 * effectively shift in blanks from the 1245 * right margin of the screen. Ensure 1246 * that they are the right color by 1247 * setting the video attributes from 1248 * the last character on the row. 1249 */ 1250 UpdateAttrs(blank); 1251 DelChar(oLastChar - nLastChar); 1252 } 1253 } 1254 } 1255 } 1256 1257 /* update the code's internal representation */ 1258 if (screen_columns > firstChar) 1259 memcpy(oldLine + firstChar, 1260 newLine + firstChar, 1261 (screen_columns - firstChar) * sizeof(chtype)); 1262 } 1263 1264 /* 1265 ** ClearScreen(blank) 1266 ** 1267 ** Clear the physical screen and put cursor at home 1268 ** 1269 */ 1270 1271 static void 1272 ClearScreen(chtype blank) 1273 { 1274 int i, j; 1275 bool fast_clear = (clear_screen || clr_eos || clr_eol); 1276 1277 TR(TRACE_UPDATE, ("ClearScreen() called")); 1278 1279 #if NCURSES_EXT_FUNCS 1280 if (SP->_coloron 1281 && !SP->_default_color) { 1282 _nc_do_color(COLOR_PAIR(SP->_current_attr), 0, FALSE, _nc_outch); 1283 if (!back_color_erase) { 1284 fast_clear = FALSE; 1285 } 1286 } 1287 #endif 1288 1289 if (fast_clear) { 1290 if (clear_screen) { 1291 UpdateAttrs(blank); 1292 TPUTS_TRACE("clear_screen"); 1293 putp(clear_screen); 1294 SP->_cursrow = SP->_curscol = 0; 1295 position_check(SP->_cursrow, SP->_curscol, "ClearScreen"); 1296 } else if (clr_eos) { 1297 SP->_cursrow = SP->_curscol = -1; 1298 GoTo(0, 0); 1299 1300 UpdateAttrs(blank); 1301 TPUTS_TRACE("clr_eos"); 1302 putp(clr_eos); 1303 } else if (clr_eol) { 1304 SP->_cursrow = SP->_curscol = -1; 1305 1306 UpdateAttrs(blank); 1307 for (i = 0; i < screen_lines; i++) { 1308 GoTo(i, 0); 1309 TPUTS_TRACE("clr_eol"); 1310 putp(clr_eol); 1311 } 1312 GoTo(0, 0); 1313 } 1314 } else { 1315 UpdateAttrs(blank); 1316 for (i = 0; i < screen_lines; i++) { 1317 GoTo(i, 0); 1318 for (j = 0; j < screen_columns; j++) 1319 PutChar(blank); 1320 } 1321 GoTo(0, 0); 1322 } 1323 1324 for (i = 0; i < screen_lines; i++) { 1325 for (j = 0; j < screen_columns; j++) 1326 curscr->_line[i].text[j] = blank; 1327 } 1328 1329 TR(TRACE_UPDATE, ("screen cleared")); 1330 } 1331 1332 /* 1333 ** InsStr(line, count) 1334 ** 1335 ** Insert the count characters pointed to by line. 1336 ** 1337 */ 1338 1339 static void 1340 InsStr(chtype * line, int count) 1341 { 1342 TR(TRACE_UPDATE, ("InsStr(%p,%d) called", line, count)); 1343 1344 /* Prefer parm_ich as it has the smallest cost - no need to shift 1345 * the whole line on each character. */ 1346 /* The order must match that of InsCharCost. */ 1347 if (parm_ich) { 1348 TPUTS_TRACE("parm_ich"); 1349 tputs(tparm(parm_ich, count), count, _nc_outch); 1350 while (count) { 1351 PutAttrChar(*line); 1352 line++; 1353 count--; 1354 } 1355 } else if (enter_insert_mode && exit_insert_mode) { 1356 TPUTS_TRACE("enter_insert_mode"); 1357 putp(enter_insert_mode); 1358 while (count) { 1359 PutAttrChar(*line); 1360 if (insert_padding) { 1361 TPUTS_TRACE("insert_padding"); 1362 putp(insert_padding); 1363 } 1364 line++; 1365 count--; 1366 } 1367 TPUTS_TRACE("exit_insert_mode"); 1368 putp(exit_insert_mode); 1369 } else { 1370 while (count) { 1371 TPUTS_TRACE("insert_character"); 1372 putp(insert_character); 1373 PutAttrChar(*line); 1374 if (insert_padding) { 1375 TPUTS_TRACE("insert_padding"); 1376 putp(insert_padding); 1377 } 1378 line++; 1379 count--; 1380 } 1381 } 1382 position_check(SP->_cursrow, SP->_curscol, "InsStr"); 1383 } 1384 1385 /* 1386 ** DelChar(count) 1387 ** 1388 ** Delete count characters at current position 1389 ** 1390 */ 1391 1392 static void 1393 DelChar(int count) 1394 { 1395 int n; 1396 1397 TR(TRACE_UPDATE, ("DelChar(%d) called, position = (%d,%d)", count, 1398 newscr->_cury, newscr->_curx)); 1399 1400 if (parm_dch) { 1401 TPUTS_TRACE("parm_dch"); 1402 tputs(tparm(parm_dch, count), count, _nc_outch); 1403 } else { 1404 for (n = 0; n < count; n++) { 1405 TPUTS_TRACE("delete_character"); 1406 putp(delete_character); 1407 } 1408 } 1409 } 1410 1411 /* 1412 ** _nc_outstr(char *str) 1413 ** 1414 ** Emit a string without waiting for update. 1415 */ 1416 1417 void 1418 _nc_outstr(const char *str) 1419 { 1420 (void) putp(str); 1421 _nc_flush(); 1422 } 1423 1424 /* 1425 * Physical-scrolling support 1426 * 1427 * This code was adapted from Keith Bostic's hardware scrolling 1428 * support for 4.4BSD curses. I (esr) translated it to use terminfo 1429 * capabilities, narrowed the call interface slightly, and cleaned 1430 * up some convoluted tests. I also added support for the memory_above 1431 * memory_below, and non_dest_scroll_region capabilities. 1432 * 1433 * For this code to work, we must have either 1434 * change_scroll_region and scroll forward/reverse commands, or 1435 * insert and delete line capabilities. 1436 * When the scrolling region has been set, the cursor has to 1437 * be at the last line of the region to make the scroll up 1438 * happen, or on the first line of region to scroll down. 1439 * 1440 * This code makes one aesthetic decision in the opposite way from 1441 * BSD curses. BSD curses preferred pairs of il/dl operations 1442 * over scrolls, allegedly because il/dl looked faster. We, on 1443 * the other hand, prefer scrolls because (a) they're just as fast 1444 * on many terminals and (b) using them avoids bouncing an 1445 * unchanged bottom section of the screen up and down, which is 1446 * visually nasty. 1447 * 1448 * (lav): added more cases, used dl/il when bot==maxy and in csr case. 1449 * 1450 * I used assumption that capabilities il/il1/dl/dl1 work inside 1451 * changed scroll region not shifting screen contents outside of it. 1452 * If there are any terminals behaving different way, it would be 1453 * necessary to add some conditions to scroll_csr_forward/backward. 1454 */ 1455 1456 /* Try to scroll up assuming given csr (miny, maxy). Returns ERR on failure */ 1457 static int 1458 scroll_csr_forward(int n, int top, int bot, int miny, int maxy, chtype blank) 1459 { 1460 int i, j; 1461 1462 if (n == 1 && scroll_forward && top == miny && bot == maxy) { 1463 GoTo(bot, 0); 1464 UpdateAttrs(blank); 1465 TPUTS_TRACE("scroll_forward"); 1466 tputs(scroll_forward, 0, _nc_outch); 1467 } else if (n == 1 && delete_line && bot == maxy) { 1468 GoTo(top, 0); 1469 UpdateAttrs(blank); 1470 TPUTS_TRACE("delete_line"); 1471 tputs(delete_line, 0, _nc_outch); 1472 } else if (parm_index && top == miny && bot == maxy) { 1473 GoTo(bot, 0); 1474 UpdateAttrs(blank); 1475 TPUTS_TRACE("parm_index"); 1476 tputs(tparm(parm_index, n, 0), n, _nc_outch); 1477 } else if (parm_delete_line && bot == maxy) { 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 } else if (scroll_forward && top == miny && bot == maxy) { 1483 GoTo(bot, 0); 1484 UpdateAttrs(blank); 1485 for (i = 0; i < n; i++) { 1486 TPUTS_TRACE("scroll_forward"); 1487 tputs(scroll_forward, 0, _nc_outch); 1488 } 1489 } else if (delete_line && bot == maxy) { 1490 GoTo(top, 0); 1491 UpdateAttrs(blank); 1492 for (i = 0; i < n; i++) { 1493 TPUTS_TRACE("delete_line"); 1494 tputs(delete_line, 0, _nc_outch); 1495 } 1496 } else 1497 return ERR; 1498 1499 #if NCURSES_EXT_FUNCS 1500 if (FILL_BCE()) { 1501 for (i = 0; i < n; i++) { 1502 GoTo(bot - i, 0); 1503 for (j = 0; j < screen_columns; j++) 1504 PutChar(blank); 1505 } 1506 } 1507 #endif 1508 return OK; 1509 } 1510 1511 /* Try to scroll down assuming given csr (miny, maxy). Returns ERR on failure */ 1512 /* n > 0 */ 1513 static int 1514 scroll_csr_backward(int n, int top, int bot, int miny, int maxy, chtype blank) 1515 { 1516 int i, j; 1517 1518 if (n == 1 && scroll_reverse && top == miny && bot == maxy) { 1519 GoTo(top, 0); 1520 UpdateAttrs(blank); 1521 TPUTS_TRACE("scroll_reverse"); 1522 tputs(scroll_reverse, 0, _nc_outch); 1523 } else if (n == 1 && insert_line && bot == maxy) { 1524 GoTo(top, 0); 1525 UpdateAttrs(blank); 1526 TPUTS_TRACE("insert_line"); 1527 tputs(insert_line, 0, _nc_outch); 1528 } else if (parm_rindex && top == miny && bot == maxy) { 1529 GoTo(top, 0); 1530 UpdateAttrs(blank); 1531 TPUTS_TRACE("parm_rindex"); 1532 tputs(tparm(parm_rindex, n, 0), n, _nc_outch); 1533 } else if (parm_insert_line && bot == maxy) { 1534 GoTo(top, 0); 1535 UpdateAttrs(blank); 1536 TPUTS_TRACE("parm_insert_line"); 1537 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1538 } else if (scroll_reverse && top == miny && bot == maxy) { 1539 GoTo(top, 0); 1540 UpdateAttrs(blank); 1541 for (i = 0; i < n; i++) { 1542 TPUTS_TRACE("scroll_reverse"); 1543 tputs(scroll_reverse, 0, _nc_outch); 1544 } 1545 } else if (insert_line && bot == maxy) { 1546 GoTo(top, 0); 1547 UpdateAttrs(blank); 1548 for (i = 0; i < n; i++) { 1549 TPUTS_TRACE("insert_line"); 1550 tputs(insert_line, 0, _nc_outch); 1551 } 1552 } else 1553 return ERR; 1554 1555 #if NCURSES_EXT_FUNCS 1556 if (FILL_BCE()) { 1557 for (i = 0; i < n; i++) { 1558 GoTo(top + i, 0); 1559 for (j = 0; j < screen_columns; j++) 1560 PutChar(blank); 1561 } 1562 } 1563 #endif 1564 return OK; 1565 } 1566 1567 /* scroll by using delete_line at del and insert_line at ins */ 1568 /* n > 0 */ 1569 static int 1570 scroll_idl(int n, int del, int ins, chtype blank) 1571 { 1572 int i; 1573 1574 if (!((parm_delete_line || delete_line) && (parm_insert_line || insert_line))) 1575 return ERR; 1576 1577 GoTo(del, 0); 1578 UpdateAttrs(blank); 1579 if (n == 1 && delete_line) { 1580 TPUTS_TRACE("delete_line"); 1581 tputs(delete_line, 0, _nc_outch); 1582 } else if (parm_delete_line) { 1583 TPUTS_TRACE("parm_delete_line"); 1584 tputs(tparm(parm_delete_line, n, 0), n, _nc_outch); 1585 } else { /* if (delete_line) */ 1586 for (i = 0; i < n; i++) { 1587 TPUTS_TRACE("delete_line"); 1588 tputs(delete_line, 0, _nc_outch); 1589 } 1590 } 1591 1592 GoTo(ins, 0); 1593 UpdateAttrs(blank); 1594 if (n == 1 && insert_line) { 1595 TPUTS_TRACE("insert_line"); 1596 tputs(insert_line, 0, _nc_outch); 1597 } else if (parm_insert_line) { 1598 TPUTS_TRACE("parm_insert_line"); 1599 tputs(tparm(parm_insert_line, n, 0), n, _nc_outch); 1600 } else { /* if (insert_line) */ 1601 for (i = 0; i < n; i++) { 1602 TPUTS_TRACE("insert_line"); 1603 tputs(insert_line, 0, _nc_outch); 1604 } 1605 } 1606 1607 return OK; 1608 } 1609 1610 int 1611 _nc_scrolln(int n, int top, int bot, int maxy) 1612 /* scroll region from top to bot by n lines */ 1613 { 1614 chtype blank = ClrBlank(stdscr); 1615 int i; 1616 bool cursor_saved = FALSE; 1617 int res; 1618 1619 TR(TRACE_MOVE, ("mvcur_scrolln(%d, %d, %d, %d)", n, top, bot, maxy)); 1620 1621 #if USE_XMC_SUPPORT 1622 /* 1623 * If we scroll, we might remove a cookie. 1624 */ 1625 if (magic_cookie_glitch > 0) { 1626 return (ERR); 1627 } 1628 #endif 1629 1630 if (n > 0) { /* scroll up (forward) */ 1631 /* 1632 * Explicitly clear if stuff pushed off top of region might 1633 * be saved by the terminal. 1634 */ 1635 res = scroll_csr_forward(n, top, bot, 0, maxy, blank); 1636 1637 if (res == ERR && change_scroll_region) { 1638 if ((((n == 1 && scroll_forward) || parm_index) 1639 && (SP->_cursrow == bot || SP->_cursrow == bot - 1)) 1640 && save_cursor && restore_cursor) { 1641 cursor_saved = TRUE; 1642 TPUTS_TRACE("save_cursor"); 1643 tputs(save_cursor, 0, _nc_outch); 1644 } 1645 TPUTS_TRACE("change_scroll_region"); 1646 tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch); 1647 if (cursor_saved) { 1648 TPUTS_TRACE("restore_cursor"); 1649 tputs(restore_cursor, 0, _nc_outch); 1650 } else { 1651 SP->_cursrow = SP->_curscol = -1; 1652 } 1653 1654 res = scroll_csr_forward(n, top, bot, top, bot, blank); 1655 1656 TPUTS_TRACE("change_scroll_region"); 1657 tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch); 1658 SP->_cursrow = SP->_curscol = -1; 1659 } 1660 1661 if (res == ERR && _nc_idlok) 1662 res = scroll_idl(n, top, bot - n + 1, blank); 1663 1664 /* 1665 * Clear the newly shifted-in text. 1666 */ 1667 if (res != ERR 1668 && (non_dest_scroll_region || (memory_below && bot == maxy))) { 1669 if (bot == maxy && clr_eos) { 1670 GoTo(bot - n, 0); 1671 ClrToEOS(BLANK); 1672 } else { 1673 for (i = 0; i < n; i++) { 1674 GoTo(bot - i, 0); 1675 ClrToEOL(BLANK, FALSE); 1676 } 1677 } 1678 } 1679 1680 } else { /* (n < 0) - scroll down (backward) */ 1681 res = scroll_csr_backward(-n, top, bot, 0, maxy, blank); 1682 1683 if (res == ERR && change_scroll_region) { 1684 if (top != 0 && (SP->_cursrow == top || SP->_cursrow == top - 1) 1685 && save_cursor && restore_cursor) { 1686 cursor_saved = TRUE; 1687 TPUTS_TRACE("save_cursor"); 1688 tputs(save_cursor, 0, _nc_outch); 1689 } 1690 TPUTS_TRACE("change_scroll_region"); 1691 tputs(tparm(change_scroll_region, top, bot), 0, _nc_outch); 1692 if (cursor_saved) { 1693 TPUTS_TRACE("restore_cursor"); 1694 tputs(restore_cursor, 0, _nc_outch); 1695 } else { 1696 SP->_cursrow = SP->_curscol = -1; 1697 } 1698 1699 res = scroll_csr_backward(-n, top, bot, top, bot, blank); 1700 1701 TPUTS_TRACE("change_scroll_region"); 1702 tputs(tparm(change_scroll_region, 0, maxy), 0, _nc_outch); 1703 SP->_cursrow = SP->_curscol = -1; 1704 } 1705 1706 if (res == ERR && _nc_idlok) 1707 res = scroll_idl(-n, bot + n + 1, top, blank); 1708 1709 /* 1710 * Clear the newly shifted-in text. 1711 */ 1712 if (res != ERR 1713 && (non_dest_scroll_region || (memory_above && top == 0))) { 1714 for (i = 0; i < -n; i++) { 1715 GoTo(i + top, 0); 1716 ClrToEOL(BLANK, FALSE); 1717 } 1718 } 1719 } 1720 1721 if (res == ERR) 1722 return (ERR); 1723 1724 _nc_scroll_window(curscr, n, top, bot, blank); 1725 1726 /* shift hash values too - they can be reused */ 1727 _nc_scroll_oldhash(n, top, bot); 1728 1729 return (OK); 1730 } 1731 1732 void 1733 _nc_screen_resume(void) 1734 { 1735 /* make sure terminal is in a sane known state */ 1736 SP->_current_attr = A_NORMAL; 1737 newscr->_clear = TRUE; 1738 1739 if (SP->_coloron == TRUE && orig_pair) 1740 putp(orig_pair); 1741 if (exit_attribute_mode) 1742 putp(exit_attribute_mode); 1743 else { 1744 /* turn off attributes */ 1745 if (exit_alt_charset_mode) 1746 putp(exit_alt_charset_mode); 1747 if (exit_standout_mode) 1748 putp(exit_standout_mode); 1749 if (exit_underline_mode) 1750 putp(exit_underline_mode); 1751 } 1752 if (exit_insert_mode) 1753 putp(exit_insert_mode); 1754 if (enter_am_mode && exit_am_mode) 1755 putp(auto_right_margin ? enter_am_mode : exit_am_mode); 1756 } 1757 1758 void 1759 _nc_screen_init(void) 1760 { 1761 _nc_screen_resume(); 1762 } 1763 1764 /* wrap up screen handling */ 1765 void 1766 _nc_screen_wrap(void) 1767 { 1768 UpdateAttrs(A_NORMAL); 1769 #if NCURSES_EXT_FUNCS 1770 if (SP->_coloron 1771 && !SP->_default_color) { 1772 SP->_default_color = TRUE; 1773 _nc_do_color(-1, 0, FALSE, _nc_outch); 1774 SP->_default_color = FALSE; 1775 1776 mvcur(SP->_cursrow, SP->_curscol, screen_lines - 1, 0); 1777 SP->_cursrow = screen_lines - 1; 1778 SP->_curscol = 0; 1779 1780 ClrToEOL(BLANK, TRUE); 1781 } 1782 #endif 1783 } 1784 1785 #if USE_XMC_SUPPORT 1786 void 1787 _nc_do_xmc_glitch(attr_t previous) 1788 { 1789 attr_t chg = XMC_CHANGES(previous ^ SP->_current_attr); 1790 1791 while (chg != 0) { 1792 if (chg & 1) { 1793 SP->_curscol += magic_cookie_glitch; 1794 if (SP->_curscol >= SP->_columns) 1795 wrap_cursor(); 1796 TR(TRACE_UPDATE, ("bumped to %d,%d after cookie", SP->_cursrow, SP->_curscol)); 1797 } 1798 chg >>= 1; 1799 } 1800 } 1801 #endif /* USE_XMC_SUPPORT */ 1802