lib_mvcur.c revision 166124
1/**************************************************************************** 2 * Copyright (c) 1998-2005,2006 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29/**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 * and: Thomas E. Dickey 1996-on * 33 ****************************************************************************/ 34 35/* 36** lib_mvcur.c 37** 38** The routines for moving the physical cursor and scrolling: 39** 40** void _nc_mvcur_init(void) 41** 42** void _nc_mvcur_resume(void) 43** 44** int mvcur(int old_y, int old_x, int new_y, int new_x) 45** 46** void _nc_mvcur_wrap(void) 47** 48** Comparisons with older movement optimizers: 49** SVr3 curses mvcur() can't use cursor_to_ll or auto_left_margin. 50** 4.4BSD curses can't use cuu/cud/cuf/cub/hpa/vpa/tab/cbt for local 51** motions. It doesn't use tactics based on auto_left_margin. Weirdly 52** enough, it doesn't use its own hardware-scrolling routine to scroll up 53** destination lines for out-of-bounds addresses! 54** old ncurses optimizer: less accurate cost computations (in fact, 55** it was broken and had to be commented out!). 56** 57** Compile with -DMAIN to build an interactive tester/timer for the movement 58** optimizer. You can use it to investigate the optimizer's behavior. 59** You can also use it for tuning the formulas used to determine whether 60** or not full optimization is attempted. 61** 62** This code has a nasty tendency to find bugs in terminfo entries, because it 63** exercises the non-cup movement capabilities heavily. If you think you've 64** found a bug, try deleting subsets of the following capabilities (arranged 65** in decreasing order of suspiciousness): it, tab, cbt, hpa, vpa, cuu, cud, 66** cuf, cub, cuu1, cud1, cuf1, cub1. It may be that one or more are wrong. 67** 68** Note: you should expect this code to look like a resource hog in a profile. 69** That's because it does a lot of I/O, through the tputs() calls. The I/O 70** cost swamps the computation overhead (and as machines get faster, this 71** will become even more true). Comments in the test exerciser at the end 72** go into detail about tuning and how you can gauge the optimizer's 73** effectiveness. 74**/ 75 76/**************************************************************************** 77 * 78 * Constants and macros for optimizer tuning. 79 * 80 ****************************************************************************/ 81 82/* 83 * The average overhead of a full optimization computation in character 84 * transmission times. If it's too high, the algorithm will be a bit 85 * over-biased toward using cup rather than local motions; if it's too 86 * low, the algorithm may spend more time than is strictly optimal 87 * looking for non-cup motions. Profile the optimizer using the `t' 88 * command of the exerciser (see below), and round to the nearest integer. 89 * 90 * Yes, I (esr) thought about computing expected overhead dynamically, say 91 * by derivation from a running average of optimizer times. But the 92 * whole point of this optimization is to *decrease* the frequency of 93 * system calls. :-) 94 */ 95#define COMPUTE_OVERHEAD 1 /* I use a 90MHz Pentium @ 9.6Kbps */ 96 97/* 98 * LONG_DIST is the distance we consider to be just as costly to move over as a 99 * cup sequence is to emit. In other words, it's the length of a cup sequence 100 * adjusted for average computation overhead. The magic number is the length 101 * of "\033[yy;xxH", the typical cup sequence these days. 102 */ 103#define LONG_DIST (8 - COMPUTE_OVERHEAD) 104 105/* 106 * Tell whether a motion is optimizable by local motions. Needs to be cheap to 107 * compute. In general, all the fast moves go to either the right or left edge 108 * of the screen. So any motion to a location that is (a) further away than 109 * LONG_DIST and (b) further inward from the right or left edge than LONG_DIST, 110 * we'll consider nonlocal. 111 */ 112#define NOT_LOCAL(fy, fx, ty, tx) ((tx > LONG_DIST) \ 113 && (tx < screen_columns - 1 - LONG_DIST) \ 114 && (abs(ty-fy) + abs(tx-fx) > LONG_DIST)) 115 116/**************************************************************************** 117 * 118 * External interfaces 119 * 120 ****************************************************************************/ 121 122/* 123 * For this code to work OK, the following components must live in the 124 * screen structure: 125 * 126 * int _char_padding; // cost of character put 127 * int _cr_cost; // cost of (carriage_return) 128 * int _cup_cost; // cost of (cursor_address) 129 * int _home_cost; // cost of (cursor_home) 130 * int _ll_cost; // cost of (cursor_to_ll) 131 *#if USE_HARD_TABS 132 * int _ht_cost; // cost of (tab) 133 * int _cbt_cost; // cost of (back_tab) 134 *#endif USE_HARD_TABS 135 * int _cub1_cost; // cost of (cursor_left) 136 * int _cuf1_cost; // cost of (cursor_right) 137 * int _cud1_cost; // cost of (cursor_down) 138 * int _cuu1_cost; // cost of (cursor_up) 139 * int _cub_cost; // cost of (parm_cursor_left) 140 * int _cuf_cost; // cost of (parm_cursor_right) 141 * int _cud_cost; // cost of (parm_cursor_down) 142 * int _cuu_cost; // cost of (parm_cursor_up) 143 * int _hpa_cost; // cost of (column_address) 144 * int _vpa_cost; // cost of (row_address) 145 * int _ech_cost; // cost of (erase_chars) 146 * int _rep_cost; // cost of (repeat_char) 147 * 148 * The USE_HARD_TABS switch controls whether it is reliable to use tab/backtabs 149 * for local motions. On many systems, it's not, due to uncertainties about 150 * tab delays and whether or not tabs will be expanded in raw mode. If you 151 * have parm_right_cursor, tab motions don't win you a lot anyhow. 152 */ 153 154#include <curses.priv.h> 155#include <term.h> 156#include <ctype.h> 157 158MODULE_ID("$Id: lib_mvcur.c,v 1.107 2006/11/25 22:31:59 tom Exp $") 159 160#define WANT_CHAR(y, x) SP->_newscr->_line[y].text[x] /* desired state */ 161#define BAUDRATE cur_term->_baudrate /* bits per second */ 162 163#if defined(MAIN) || defined(NCURSES_TEST) 164#include <sys/time.h> 165 166static bool profiling = FALSE; 167static float diff; 168#endif /* MAIN */ 169 170#define OPT_SIZE 512 171 172static int normalized_cost(const char *const cap, int affcnt); 173 174/**************************************************************************** 175 * 176 * Initialization/wrapup (including cost pre-computation) 177 * 178 ****************************************************************************/ 179 180#ifdef TRACE 181static int 182trace_cost_of(const char *capname, const char *cap, int affcnt) 183{ 184 int result = _nc_msec_cost(cap, affcnt); 185 TR(TRACE_CHARPUT | TRACE_MOVE, 186 ("CostOf %s %d %s", capname, result, _nc_visbuf(cap))); 187 return result; 188} 189#define CostOf(cap,affcnt) trace_cost_of(#cap,cap,affcnt); 190 191static int 192trace_normalized_cost(const char *capname, const char *cap, int affcnt) 193{ 194 int result = normalized_cost(cap, affcnt); 195 TR(TRACE_CHARPUT | TRACE_MOVE, 196 ("NormalizedCost %s %d %s", capname, result, _nc_visbuf(cap))); 197 return result; 198} 199#define NormalizedCost(cap,affcnt) trace_normalized_cost(#cap,cap,affcnt); 200 201#else 202 203#define CostOf(cap,affcnt) _nc_msec_cost(cap,affcnt); 204#define NormalizedCost(cap,affcnt) normalized_cost(cap,affcnt); 205 206#endif 207 208NCURSES_EXPORT(int) 209_nc_msec_cost(const char *const cap, int affcnt) 210/* compute the cost of a given operation */ 211{ 212 if (cap == 0) 213 return (INFINITY); 214 else { 215 const char *cp; 216 float cum_cost = 0.0; 217 218 for (cp = cap; *cp; cp++) { 219 /* extract padding, either mandatory or required */ 220 if (cp[0] == '$' && cp[1] == '<' && strchr(cp, '>')) { 221 float number = 0.0; 222 223 for (cp += 2; *cp != '>'; cp++) { 224 if (isdigit(UChar(*cp))) 225 number = number * 10 + (*cp - '0'); 226 else if (*cp == '*') 227 number *= affcnt; 228 else if (*cp == '.' && (*++cp != '>') && isdigit(UChar(*cp))) 229 number += (*cp - '0') / 10.0; 230 } 231 232#if NCURSES_NO_PADDING 233 if (!(SP->_no_padding)) 234#endif 235 cum_cost += number * 10; 236 } else 237 cum_cost += SP->_char_padding; 238 } 239 240 return ((int) cum_cost); 241 } 242} 243 244static int 245normalized_cost(const char *const cap, int affcnt) 246/* compute the effective character-count for an operation (round up) */ 247{ 248 int cost = _nc_msec_cost(cap, affcnt); 249 if (cost != INFINITY) 250 cost = (cost + SP->_char_padding - 1) / SP->_char_padding; 251 return cost; 252} 253 254static void 255reset_scroll_region(void) 256/* Set the scroll-region to a known state (the default) */ 257{ 258 if (change_scroll_region) { 259 TPUTS_TRACE("change_scroll_region"); 260 putp(TPARM_2(change_scroll_region, 0, screen_lines - 1)); 261 } 262} 263 264NCURSES_EXPORT(void) 265_nc_mvcur_resume(void) 266/* what to do at initialization time and after each shellout */ 267{ 268 /* initialize screen for cursor access */ 269 if (enter_ca_mode) { 270 TPUTS_TRACE("enter_ca_mode"); 271 putp(enter_ca_mode); 272 } 273 274 /* 275 * Doing this here rather than in _nc_mvcur_wrap() ensures that 276 * ncurses programs will see a reset scroll region even if a 277 * program that messed with it died ungracefully. 278 * 279 * This also undoes the effects of terminal init strings that assume 280 * they know the screen size. This is useful when you're running 281 * a vt100 emulation through xterm. 282 */ 283 reset_scroll_region(); 284 SP->_cursrow = SP->_curscol = -1; 285 286 /* restore cursor shape */ 287 if (SP->_cursor != -1) { 288 int cursor = SP->_cursor; 289 SP->_cursor = -1; 290 curs_set(cursor); 291 } 292} 293 294NCURSES_EXPORT(void) 295_nc_mvcur_init(void) 296/* initialize the cost structure */ 297{ 298 if (isatty(fileno(SP->_ofp))) 299 SP->_char_padding = ((BAUDBYTE * 1000 * 10) 300 / (BAUDRATE > 0 ? BAUDRATE : 9600)); 301 else 302 SP->_char_padding = 1; /* must be nonzero */ 303 if (SP->_char_padding <= 0) 304 SP->_char_padding = 1; /* must be nonzero */ 305 TR(TRACE_CHARPUT | TRACE_MOVE, ("char_padding %d msecs", SP->_char_padding)); 306 307 /* non-parameterized local-motion strings */ 308 SP->_cr_cost = CostOf(carriage_return, 0); 309 SP->_home_cost = CostOf(cursor_home, 0); 310 SP->_ll_cost = CostOf(cursor_to_ll, 0); 311#if USE_HARD_TABS 312 if (getenv("NCURSES_NO_HARD_TABS") == 0) { 313 SP->_ht_cost = CostOf(tab, 0); 314 SP->_cbt_cost = CostOf(back_tab, 0); 315 } else { 316 SP->_ht_cost = INFINITY; 317 SP->_cbt_cost = INFINITY; 318 } 319#endif /* USE_HARD_TABS */ 320 SP->_cub1_cost = CostOf(cursor_left, 0); 321 SP->_cuf1_cost = CostOf(cursor_right, 0); 322 SP->_cud1_cost = CostOf(cursor_down, 0); 323 SP->_cuu1_cost = CostOf(cursor_up, 0); 324 325 SP->_smir_cost = CostOf(enter_insert_mode, 0); 326 SP->_rmir_cost = CostOf(exit_insert_mode, 0); 327 SP->_ip_cost = 0; 328 if (insert_padding) { 329 SP->_ip_cost = CostOf(insert_padding, 0); 330 } 331 332 /* 333 * Assumption: if the terminal has memory_relative addressing, the 334 * initialization strings or smcup will set single-page mode so we 335 * can treat it like absolute screen addressing. This seems to be true 336 * for all cursor_mem_address terminal types in the terminfo database. 337 */ 338 SP->_address_cursor = cursor_address ? cursor_address : cursor_mem_address; 339 340 /* 341 * Parametrized local-motion strings. This static cost computation 342 * depends on the following assumptions: 343 * 344 * (1) They never have * padding. In the entire master terminfo database 345 * as of March 1995, only the obsolete Zenith Z-100 pc violates this. 346 * (Proportional padding is found mainly in insert, delete and scroll 347 * capabilities). 348 * 349 * (2) The average case of cup has two two-digit parameters. Strictly, 350 * the average case for a 24 * 80 screen has ((10*10*(1 + 1)) + 351 * (14*10*(1 + 2)) + (10*70*(2 + 1)) + (14*70*4)) / (24*80) = 3.458 352 * digits of parameters. On a 25x80 screen the average is 3.6197. 353 * On larger screens the value gets much closer to 4. 354 * 355 * (3) The average case of cub/cuf/hpa/ech/rep has 2 digits of parameters 356 * (strictly, (((10 * 1) + (70 * 2)) / 80) = 1.8750). 357 * 358 * (4) The average case of cud/cuu/vpa has 2 digits of parameters 359 * (strictly, (((10 * 1) + (14 * 2)) / 24) = 1.5833). 360 * 361 * All these averages depend on the assumption that all parameter values 362 * are equally probable. 363 */ 364 SP->_cup_cost = CostOf(TPARM_2(SP->_address_cursor, 23, 23), 1); 365 SP->_cub_cost = CostOf(TPARM_1(parm_left_cursor, 23), 1); 366 SP->_cuf_cost = CostOf(TPARM_1(parm_right_cursor, 23), 1); 367 SP->_cud_cost = CostOf(TPARM_1(parm_down_cursor, 23), 1); 368 SP->_cuu_cost = CostOf(TPARM_1(parm_up_cursor, 23), 1); 369 SP->_hpa_cost = CostOf(TPARM_1(column_address, 23), 1); 370 SP->_vpa_cost = CostOf(TPARM_1(row_address, 23), 1); 371 372 /* non-parameterized screen-update strings */ 373 SP->_ed_cost = NormalizedCost(clr_eos, 1); 374 SP->_el_cost = NormalizedCost(clr_eol, 1); 375 SP->_el1_cost = NormalizedCost(clr_bol, 1); 376 SP->_dch1_cost = NormalizedCost(delete_character, 1); 377 SP->_ich1_cost = NormalizedCost(insert_character, 1); 378 379 /* 380 * If this is a bce-terminal, we want to bias the choice so we use clr_eol 381 * rather than spaces at the end of a line. 382 */ 383 if (back_color_erase) 384 SP->_el_cost = 0; 385 386 /* parameterized screen-update strings */ 387 SP->_dch_cost = NormalizedCost(TPARM_1(parm_dch, 23), 1); 388 SP->_ich_cost = NormalizedCost(TPARM_1(parm_ich, 23), 1); 389 SP->_ech_cost = NormalizedCost(TPARM_1(erase_chars, 23), 1); 390 SP->_rep_cost = NormalizedCost(TPARM_2(repeat_char, ' ', 23), 1); 391 392 SP->_cup_ch_cost = NormalizedCost(TPARM_2(SP->_address_cursor, 23, 23), 1); 393 SP->_hpa_ch_cost = NormalizedCost(TPARM_1(column_address, 23), 1); 394 SP->_cuf_ch_cost = NormalizedCost(TPARM_1(parm_right_cursor, 23), 1); 395 SP->_inline_cost = min(SP->_cup_ch_cost, 396 min(SP->_hpa_ch_cost, 397 SP->_cuf_ch_cost)); 398 399 /* 400 * If save_cursor is used within enter_ca_mode, we should not use it for 401 * scrolling optimization, since the corresponding restore_cursor is not 402 * nested on the various terminals (vt100, xterm, etc.) which use this 403 * feature. 404 */ 405 if (save_cursor != 0 406 && enter_ca_mode != 0 407 && strstr(enter_ca_mode, save_cursor) != 0) { 408 T(("...suppressed sc/rc capability due to conflict with smcup/rmcup")); 409 save_cursor = 0; 410 restore_cursor = 0; 411 } 412 413 /* 414 * A different, possibly better way to arrange this would be to set 415 * SP->_endwin = TRUE at window initialization time and let this be 416 * called by doupdate's return-from-shellout code. 417 */ 418 _nc_mvcur_resume(); 419} 420 421NCURSES_EXPORT(void) 422_nc_mvcur_wrap(void) 423/* wrap up cursor-addressing mode */ 424{ 425 /* leave cursor at screen bottom */ 426 mvcur(-1, -1, screen_lines - 1, 0); 427 428 /* set cursor to normal mode */ 429 if (SP->_cursor != -1) 430 curs_set(1); 431 432 if (exit_ca_mode) { 433 TPUTS_TRACE("exit_ca_mode"); 434 putp(exit_ca_mode); 435 } 436 /* 437 * Reset terminal's tab counter. There's a long-time bug that 438 * if you exit a "curses" program such as vi or more, tab 439 * forward, and then backspace, the cursor doesn't go to the 440 * right place. The problem is that the kernel counts the 441 * escape sequences that reset things as column positions. 442 * Utter a \r to reset this invisibly. 443 */ 444 _nc_outch('\r'); 445} 446 447/**************************************************************************** 448 * 449 * Optimized cursor movement 450 * 451 ****************************************************************************/ 452 453/* 454 * Perform repeated-append, returning cost 455 */ 456static NCURSES_INLINE int 457repeated_append(string_desc * target, int total, int num, int repeat, const char *src) 458{ 459 size_t need = repeat * strlen(src); 460 461 if (need < target->s_size) { 462 while (repeat-- > 0) { 463 if (_nc_safe_strcat(target, src)) { 464 total += num; 465 } else { 466 total = INFINITY; 467 break; 468 } 469 } 470 } else { 471 total = INFINITY; 472 } 473 return total; 474} 475 476#ifndef NO_OPTIMIZE 477#define NEXTTAB(fr) (fr + init_tabs - (fr % init_tabs)) 478 479/* 480 * Assume back_tab (CBT) does not wrap backwards at the left margin, return 481 * a negative value at that point to simplify the loop. 482 */ 483#define LASTTAB(fr) ((fr > 0) ? ((fr - 1) / init_tabs) * init_tabs : -1) 484 485static int 486relative_move(string_desc * target, int from_y, int from_x, int to_y, int 487 to_x, bool ovw) 488/* move via local motions (cuu/cuu1/cud/cud1/cub1/cub/cuf1/cuf/vpa/hpa) */ 489{ 490 string_desc save; 491 int n, vcost = 0, hcost = 0; 492 493 (void) _nc_str_copy(&save, target); 494 495 if (to_y != from_y) { 496 vcost = INFINITY; 497 498 if (row_address != 0 499 && _nc_safe_strcat(target, TPARM_1(row_address, to_y))) { 500 vcost = SP->_vpa_cost; 501 } 502 503 if (to_y > from_y) { 504 n = (to_y - from_y); 505 506 if (parm_down_cursor 507 && SP->_cud_cost < vcost 508 && _nc_safe_strcat(_nc_str_copy(target, &save), 509 TPARM_1(parm_down_cursor, n))) { 510 vcost = SP->_cud_cost; 511 } 512 513 if (cursor_down 514 && (*cursor_down != '\n' || SP->_nl) 515 && (n * SP->_cud1_cost < vcost)) { 516 vcost = repeated_append(_nc_str_copy(target, &save), 0, 517 SP->_cud1_cost, n, cursor_down); 518 } 519 } else { /* (to_y < from_y) */ 520 n = (from_y - to_y); 521 522 if (parm_up_cursor 523 && SP->_cuu_cost < vcost 524 && _nc_safe_strcat(_nc_str_copy(target, &save), 525 TPARM_1(parm_up_cursor, n))) { 526 vcost = SP->_cuu_cost; 527 } 528 529 if (cursor_up && (n * SP->_cuu1_cost < vcost)) { 530 vcost = repeated_append(_nc_str_copy(target, &save), 0, 531 SP->_cuu1_cost, n, cursor_up); 532 } 533 } 534 535 if (vcost == INFINITY) 536 return (INFINITY); 537 } 538 539 save = *target; 540 541 if (to_x != from_x) { 542 char str[OPT_SIZE]; 543 string_desc check; 544 545 hcost = INFINITY; 546 547 if (column_address 548 && _nc_safe_strcat(_nc_str_copy(target, &save), 549 TPARM_1(column_address, to_x))) { 550 hcost = SP->_hpa_cost; 551 } 552 553 if (to_x > from_x) { 554 n = to_x - from_x; 555 556 if (parm_right_cursor 557 && SP->_cuf_cost < hcost 558 && _nc_safe_strcat(_nc_str_copy(target, &save), 559 TPARM_1(parm_right_cursor, n))) { 560 hcost = SP->_cuf_cost; 561 } 562 563 if (cursor_right) { 564 int lhcost = 0; 565 566 (void) _nc_str_init(&check, str, sizeof(str)); 567 568#if USE_HARD_TABS 569 /* use hard tabs, if we have them, to do as much as possible */ 570 if (init_tabs > 0 && tab) { 571 int nxt, fr; 572 573 for (fr = from_x; (nxt = NEXTTAB(fr)) <= to_x; fr = nxt) { 574 lhcost = repeated_append(&check, lhcost, 575 SP->_ht_cost, 1, tab); 576 if (lhcost == INFINITY) 577 break; 578 } 579 580 n = to_x - fr; 581 from_x = fr; 582 } 583#endif /* USE_HARD_TABS */ 584 585 if (n <= 0 || n >= (int) check.s_size) 586 ovw = FALSE; 587#if BSD_TPUTS 588 /* 589 * If we're allowing BSD-style padding in tputs, don't generate 590 * a string with a leading digit. Otherwise, that will be 591 * interpreted as a padding value rather than sent to the 592 * screen. 593 */ 594 if (ovw 595 && n > 0 596 && n < (int) check.s_size 597 && vcost == 0 598 && str[0] == '\0') { 599 int wanted = CharOf(WANT_CHAR(to_y, from_x)); 600 if (is8bits(wanted) && isdigit(wanted)) 601 ovw = FALSE; 602 } 603#endif 604 /* 605 * If we have no attribute changes, overwrite is cheaper. 606 * Note: must suppress this by passing in ovw = FALSE whenever 607 * WANT_CHAR would return invalid data. In particular, this 608 * is true between the time a hardware scroll has been done 609 * and the time the structure WANT_CHAR would access has been 610 * updated. 611 */ 612 if (ovw) { 613 int i; 614 615 for (i = 0; i < n; i++) { 616 NCURSES_CH_T ch = WANT_CHAR(to_y, from_x + i); 617 if (!SameAttrOf(ch, SCREEN_ATTRS(SP)) 618#if USE_WIDEC_SUPPORT 619 || !Charable(ch) 620#endif 621 ) { 622 ovw = FALSE; 623 break; 624 } 625 } 626 } 627 if (ovw) { 628 int i; 629 630 for (i = 0; i < n; i++) 631 *check.s_tail++ = CharOf(WANT_CHAR(to_y, from_x + i)); 632 *check.s_tail = '\0'; 633 check.s_size -= n; 634 lhcost += n * SP->_char_padding; 635 } else { 636 lhcost = repeated_append(&check, lhcost, SP->_cuf1_cost, 637 n, cursor_right); 638 } 639 640 if (lhcost < hcost 641 && _nc_safe_strcat(_nc_str_copy(target, &save), str)) { 642 hcost = lhcost; 643 } 644 } 645 } else { /* (to_x < from_x) */ 646 n = from_x - to_x; 647 648 if (parm_left_cursor 649 && SP->_cub_cost < hcost 650 && _nc_safe_strcat(_nc_str_copy(target, &save), 651 TPARM_1(parm_left_cursor, n))) { 652 hcost = SP->_cub_cost; 653 } 654 655 if (cursor_left) { 656 int lhcost = 0; 657 658 (void) _nc_str_init(&check, str, sizeof(str)); 659 660#if USE_HARD_TABS 661 if (init_tabs > 0 && back_tab) { 662 int nxt, fr; 663 664 for (fr = from_x; (nxt = LASTTAB(fr)) >= to_x; fr = nxt) { 665 lhcost = repeated_append(&check, lhcost, 666 SP->_cbt_cost, 1, back_tab); 667 if (lhcost == INFINITY) 668 break; 669 } 670 671 n = fr - to_x; 672 } 673#endif /* USE_HARD_TABS */ 674 675 lhcost = repeated_append(&check, lhcost, SP->_cub1_cost, n, cursor_left); 676 677 if (lhcost < hcost 678 && _nc_safe_strcat(_nc_str_copy(target, &save), str)) { 679 hcost = lhcost; 680 } 681 } 682 } 683 684 if (hcost == INFINITY) 685 return (INFINITY); 686 } 687 688 return (vcost + hcost); 689} 690#endif /* !NO_OPTIMIZE */ 691 692/* 693 * With the machinery set up above, it's conceivable that 694 * onscreen_mvcur could be modified into a recursive function that does 695 * an alpha-beta search of motion space, as though it were a chess 696 * move tree, with the weight function being boolean and the search 697 * depth equated to length of string. However, this would jack up the 698 * computation cost a lot, especially on terminals without a cup 699 * capability constraining the search tree depth. So we settle for 700 * the simpler method below. 701 */ 702 703static NCURSES_INLINE int 704onscreen_mvcur(int yold, int xold, int ynew, int xnew, bool ovw) 705/* onscreen move from (yold, xold) to (ynew, xnew) */ 706{ 707 string_desc result; 708 char buffer[OPT_SIZE]; 709 int tactic = 0, newcost, usecost = INFINITY; 710 int t5_cr_cost; 711 712#if defined(MAIN) || defined(NCURSES_TEST) 713 struct timeval before, after; 714 715 gettimeofday(&before, NULL); 716#endif /* MAIN */ 717 718#define NullResult _nc_str_null(&result, sizeof(buffer)) 719#define InitResult _nc_str_init(&result, buffer, sizeof(buffer)) 720 721 /* tactic #0: use direct cursor addressing */ 722 if (_nc_safe_strcpy(InitResult, TPARM_2(SP->_address_cursor, ynew, xnew))) { 723 tactic = 0; 724 usecost = SP->_cup_cost; 725 726#if defined(TRACE) || defined(NCURSES_TEST) 727 if (!(_nc_optimize_enable & OPTIMIZE_MVCUR)) 728 goto nonlocal; 729#endif /* TRACE */ 730 731 /* 732 * We may be able to tell in advance that the full optimization 733 * will probably not be worth its overhead. Also, don't try to 734 * use local movement if the current attribute is anything but 735 * A_NORMAL...there are just too many ways this can screw up 736 * (like, say, local-movement \n getting mapped to some obscure 737 * character because A_ALTCHARSET is on). 738 */ 739 if (yold == -1 || xold == -1 || NOT_LOCAL(yold, xold, ynew, xnew)) { 740#if defined(MAIN) || defined(NCURSES_TEST) 741 if (!profiling) { 742 (void) fputs("nonlocal\n", stderr); 743 goto nonlocal; /* always run the optimizer if profiling */ 744 } 745#else 746 goto nonlocal; 747#endif /* MAIN */ 748 } 749 } 750#ifndef NO_OPTIMIZE 751 /* tactic #1: use local movement */ 752 if (yold != -1 && xold != -1 753 && ((newcost = relative_move(NullResult, yold, xold, ynew, xnew, 754 ovw)) != INFINITY) 755 && newcost < usecost) { 756 tactic = 1; 757 usecost = newcost; 758 } 759 760 /* tactic #2: use carriage-return + local movement */ 761 if (yold != -1 && carriage_return 762 && ((newcost = relative_move(NullResult, yold, 0, ynew, xnew, ovw)) 763 != INFINITY) 764 && SP->_cr_cost + newcost < usecost) { 765 tactic = 2; 766 usecost = SP->_cr_cost + newcost; 767 } 768 769 /* tactic #3: use home-cursor + local movement */ 770 if (cursor_home 771 && ((newcost = relative_move(NullResult, 0, 0, ynew, xnew, ovw)) != INFINITY) 772 && SP->_home_cost + newcost < usecost) { 773 tactic = 3; 774 usecost = SP->_home_cost + newcost; 775 } 776 777 /* tactic #4: use home-down + local movement */ 778 if (cursor_to_ll 779 && ((newcost = relative_move(NullResult, screen_lines - 1, 0, ynew, 780 xnew, ovw)) != INFINITY) 781 && SP->_ll_cost + newcost < usecost) { 782 tactic = 4; 783 usecost = SP->_ll_cost + newcost; 784 } 785 786 /* 787 * tactic #5: use left margin for wrap to right-hand side, 788 * unless strange wrap behavior indicated by xenl might hose us. 789 */ 790 t5_cr_cost = (xold > 0 ? SP->_cr_cost : 0); 791 if (auto_left_margin && !eat_newline_glitch 792 && yold > 0 && cursor_left 793 && ((newcost = relative_move(NullResult, yold - 1, screen_columns - 794 1, ynew, xnew, ovw)) != INFINITY) 795 && t5_cr_cost + SP->_cub1_cost + newcost < usecost) { 796 tactic = 5; 797 usecost = t5_cr_cost + SP->_cub1_cost + newcost; 798 } 799 800 /* 801 * These cases are ordered by estimated relative frequency. 802 */ 803 if (tactic) 804 InitResult; 805 switch (tactic) { 806 case 1: 807 (void) relative_move(&result, yold, xold, ynew, xnew, ovw); 808 break; 809 case 2: 810 (void) _nc_safe_strcpy(&result, carriage_return); 811 (void) relative_move(&result, yold, 0, ynew, xnew, ovw); 812 break; 813 case 3: 814 (void) _nc_safe_strcpy(&result, cursor_home); 815 (void) relative_move(&result, 0, 0, ynew, xnew, ovw); 816 break; 817 case 4: 818 (void) _nc_safe_strcpy(&result, cursor_to_ll); 819 (void) relative_move(&result, screen_lines - 1, 0, ynew, xnew, ovw); 820 break; 821 case 5: 822 if (xold > 0) 823 (void) _nc_safe_strcat(&result, carriage_return); 824 (void) _nc_safe_strcat(&result, cursor_left); 825 (void) relative_move(&result, yold - 1, screen_columns - 1, ynew, 826 xnew, ovw); 827 break; 828 } 829#endif /* !NO_OPTIMIZE */ 830 831 nonlocal: 832#if defined(MAIN) || defined(NCURSES_TEST) 833 gettimeofday(&after, NULL); 834 diff = after.tv_usec - before.tv_usec 835 + (after.tv_sec - before.tv_sec) * 1000000; 836 if (!profiling) 837 (void) fprintf(stderr, 838 "onscreen: %d microsec, %f 28.8Kbps char-equivalents\n", 839 (int) diff, diff / 288); 840#endif /* MAIN */ 841 842 if (usecost != INFINITY) { 843 TPUTS_TRACE("mvcur"); 844 tputs(buffer, 1, _nc_outch); 845 SP->_cursrow = ynew; 846 SP->_curscol = xnew; 847 return (OK); 848 } else 849 return (ERR); 850} 851 852NCURSES_EXPORT(int) 853mvcur(int yold, int xold, int ynew, int xnew) 854/* optimized cursor move from (yold, xold) to (ynew, xnew) */ 855{ 856 NCURSES_CH_T oldattr; 857 int code; 858 859 TR(TRACE_CALLS | TRACE_MOVE, (T_CALLED("mvcur(%d,%d,%d,%d)"), 860 yold, xold, ynew, xnew)); 861 862 if (SP == 0) { 863 code = ERR; 864 } else if (yold == ynew && xold == xnew) { 865 code = OK; 866 } else { 867 868 /* 869 * Most work here is rounding for terminal boundaries getting the 870 * column position implied by wraparound or the lack thereof and 871 * rolling up the screen to get ynew on the screen. 872 */ 873 if (xnew >= screen_columns) { 874 ynew += xnew / screen_columns; 875 xnew %= screen_columns; 876 } 877 878 /* 879 * Force restore even if msgr is on when we're in an alternate 880 * character set -- these have a strong tendency to screw up the CR & 881 * LF used for local character motions! 882 */ 883 oldattr = SCREEN_ATTRS(SP); 884 if ((AttrOf(oldattr) & A_ALTCHARSET) 885 || (AttrOf(oldattr) && !move_standout_mode)) { 886 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move", 887 (unsigned long) AttrOf(oldattr), 888 _traceattr(AttrOf(oldattr)))); 889 (void) VIDATTR(A_NORMAL, 0); 890 } 891 892 if (xold >= screen_columns) { 893 int l; 894 895 if (SP->_nl) { 896 l = (xold + 1) / screen_columns; 897 yold += l; 898 if (yold >= screen_lines) 899 l -= (yold - screen_lines - 1); 900 901 if (l > 0) { 902 if (carriage_return) { 903 TPUTS_TRACE("carriage_return"); 904 putp(carriage_return); 905 } else 906 _nc_outch('\r'); 907 xold = 0; 908 909 while (l > 0) { 910 if (newline) { 911 TPUTS_TRACE("newline"); 912 putp(newline); 913 } else 914 _nc_outch('\n'); 915 l--; 916 } 917 } 918 } else { 919 /* 920 * If caller set nonl(), we cannot really use newlines to 921 * position to the next row. 922 */ 923 xold = -1; 924 yold = -1; 925 } 926 } 927 928 if (yold > screen_lines - 1) 929 yold = screen_lines - 1; 930 if (ynew > screen_lines - 1) 931 ynew = screen_lines - 1; 932 933 /* destination location is on screen now */ 934 code = onscreen_mvcur(yold, xold, ynew, xnew, TRUE); 935 936 /* 937 * Restore attributes if we disabled them before moving. 938 */ 939 if (!SameAttrOf(oldattr, SCREEN_ATTRS(SP))) { 940 TR(TRACE_CHARPUT, ("turning on (%#lx) %s after move", 941 (unsigned long) AttrOf(oldattr), 942 _traceattr(AttrOf(oldattr)))); 943 (void) VIDATTR(AttrOf(oldattr), GetPair(oldattr)); 944 } 945 } 946 returnCode(code); 947} 948 949#if defined(TRACE) || defined(NCURSES_TEST) 950NCURSES_EXPORT_VAR(int) _nc_optimize_enable = OPTIMIZE_ALL; 951#endif 952 953#if defined(MAIN) || defined(NCURSES_TEST) 954/**************************************************************************** 955 * 956 * Movement optimizer test code 957 * 958 ****************************************************************************/ 959 960#include <tic.h> 961#include <dump_entry.h> 962 963NCURSES_EXPORT_VAR(const char *) _nc_progname = "mvcur"; 964 965static unsigned long xmits; 966 967/* these override lib_tputs.c */ 968NCURSES_EXPORT(int) 969tputs(const char *string, int affcnt GCC_UNUSED, int (*outc) (int) GCC_UNUSED) 970/* stub tputs() that dumps sequences in a visible form */ 971{ 972 if (profiling) 973 xmits += strlen(string); 974 else 975 (void) fputs(_nc_visbuf(string), stdout); 976 return (OK); 977} 978 979NCURSES_EXPORT(int) 980putp(const char *string) 981{ 982 return (tputs(string, 1, _nc_outch)); 983} 984 985NCURSES_EXPORT(int) 986_nc_outch(int ch) 987{ 988 putc(ch, stdout); 989 return OK; 990} 991 992NCURSES_EXPORT(int) 993delay_output(int ms GCC_UNUSED) 994{ 995 return OK; 996} 997 998static char tname[PATH_MAX]; 999 1000static void 1001load_term(void) 1002{ 1003 (void) setupterm(tname, STDOUT_FILENO, NULL); 1004} 1005 1006static int 1007roll(int n) 1008{ 1009 int i, j; 1010 1011 i = (RAND_MAX / n) * n; 1012 while ((j = rand()) >= i) 1013 continue; 1014 return (j % n); 1015} 1016 1017int 1018main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED) 1019{ 1020 (void) strcpy(tname, termname()); 1021 load_term(); 1022 _nc_setupscreen(lines, columns, stdout, FALSE, 0); 1023 baudrate(); 1024 1025 _nc_mvcur_init(); 1026 NC_BUFFERED(FALSE); 1027 1028 (void) puts("The mvcur tester. Type ? for help"); 1029 1030 fputs("smcup:", stdout); 1031 putchar('\n'); 1032 1033 for (;;) { 1034 int fy, fx, ty, tx, n, i; 1035 char buf[BUFSIZ], capname[BUFSIZ]; 1036 1037 (void) fputs("> ", stdout); 1038 (void) fgets(buf, sizeof(buf), stdin); 1039 1040 if (buf[0] == '?') { 1041 (void) puts("? -- display this help message"); 1042 (void) 1043 puts("fy fx ty tx -- (4 numbers) display (fy,fx)->(ty,tx) move"); 1044 (void) puts("s[croll] n t b m -- display scrolling sequence"); 1045 (void) 1046 printf("r[eload] -- reload terminal info for %s\n", 1047 termname()); 1048 (void) 1049 puts("l[oad] <term> -- load terminal info for type <term>"); 1050 (void) puts("d[elete] <cap> -- delete named capability"); 1051 (void) puts("i[nspect] -- display terminal capabilities"); 1052 (void) 1053 puts("c[ost] -- dump cursor-optimization cost table"); 1054 (void) puts("o[optimize] -- toggle movement optimization"); 1055 (void) 1056 puts("t[orture] <num> -- torture-test with <num> random moves"); 1057 (void) puts("q[uit] -- quit the program"); 1058 } else if (sscanf(buf, "%d %d %d %d", &fy, &fx, &ty, &tx) == 4) { 1059 struct timeval before, after; 1060 1061 putchar('"'); 1062 1063 gettimeofday(&before, NULL); 1064 mvcur(fy, fx, ty, tx); 1065 gettimeofday(&after, NULL); 1066 1067 printf("\" (%ld msec)\n", 1068 (long) (after.tv_usec - before.tv_usec 1069 + (after.tv_sec - before.tv_sec) 1070 * 1000000)); 1071 } else if (sscanf(buf, "s %d %d %d %d", &fy, &fx, &ty, &tx) == 4) { 1072 struct timeval before, after; 1073 1074 putchar('"'); 1075 1076 gettimeofday(&before, NULL); 1077 _nc_scrolln(fy, fx, ty, tx); 1078 gettimeofday(&after, NULL); 1079 1080 printf("\" (%ld msec)\n", 1081 (long) (after.tv_usec - before.tv_usec + (after.tv_sec - 1082 before.tv_sec) 1083 * 1000000)); 1084 } else if (buf[0] == 'r') { 1085 (void) strcpy(tname, termname()); 1086 load_term(); 1087 } else if (sscanf(buf, "l %s", tname) == 1) { 1088 load_term(); 1089 } else if (sscanf(buf, "d %s", capname) == 1) { 1090 struct name_table_entry const *np = _nc_find_entry(capname, 1091 _nc_info_hash_table); 1092 1093 if (np == NULL) 1094 (void) printf("No such capability as \"%s\"\n", capname); 1095 else { 1096 switch (np->nte_type) { 1097 case BOOLEAN: 1098 cur_term->type.Booleans[np->nte_index] = FALSE; 1099 (void) 1100 printf("Boolean capability `%s' (%d) turned off.\n", 1101 np->nte_name, np->nte_index); 1102 break; 1103 1104 case NUMBER: 1105 cur_term->type.Numbers[np->nte_index] = ABSENT_NUMERIC; 1106 (void) printf("Number capability `%s' (%d) set to -1.\n", 1107 np->nte_name, np->nte_index); 1108 break; 1109 1110 case STRING: 1111 cur_term->type.Strings[np->nte_index] = ABSENT_STRING; 1112 (void) printf("String capability `%s' (%d) deleted.\n", 1113 np->nte_name, np->nte_index); 1114 break; 1115 } 1116 } 1117 } else if (buf[0] == 'i') { 1118 dump_init((char *) NULL, F_TERMINFO, S_TERMINFO, 70, 0, FALSE); 1119 dump_entry(&cur_term->type, FALSE, TRUE, 0, 0, 0); 1120 putchar('\n'); 1121 } else if (buf[0] == 'o') { 1122 if (_nc_optimize_enable & OPTIMIZE_MVCUR) { 1123 _nc_optimize_enable &= ~OPTIMIZE_MVCUR; 1124 (void) puts("Optimization is now off."); 1125 } else { 1126 _nc_optimize_enable |= OPTIMIZE_MVCUR; 1127 (void) puts("Optimization is now on."); 1128 } 1129 } 1130 /* 1131 * You can use the `t' test to profile and tune the movement 1132 * optimizer. Use iteration values in three digits or more. 1133 * At above 5000 iterations the profile timing averages are stable 1134 * to within a millisecond or three. 1135 * 1136 * The `overhead' field of the report will help you pick a 1137 * COMPUTE_OVERHEAD figure appropriate for your processor and 1138 * expected line speed. The `total estimated time' is 1139 * computation time plus a character-transmission time 1140 * estimate computed from the number of transmits and the baud 1141 * rate. 1142 * 1143 * Use this together with the `o' command to get a read on the 1144 * optimizer's effectiveness. Compare the total estimated times 1145 * for `t' runs of the same length in both optimized and un-optimized 1146 * modes. As long as the optimized times are less, the optimizer 1147 * is winning. 1148 */ 1149 else if (sscanf(buf, "t %d", &n) == 1) { 1150 float cumtime = 0.0, perchar; 1151 int speeds[] = 1152 {2400, 9600, 14400, 19200, 28800, 38400, 0}; 1153 1154 srand((unsigned) (getpid() + time((time_t *) 0))); 1155 profiling = TRUE; 1156 xmits = 0; 1157 for (i = 0; i < n; i++) { 1158 /* 1159 * This does a move test between two random locations, 1160 * Random moves probably short-change the optimizer, 1161 * which will work better on the short moves probably 1162 * typical of doupdate()'s usage pattern. Still, 1163 * until we have better data... 1164 */ 1165#ifdef FIND_COREDUMP 1166 int from_y = roll(lines); 1167 int to_y = roll(lines); 1168 int from_x = roll(columns); 1169 int to_x = roll(columns); 1170 1171 printf("(%d,%d) -> (%d,%d)\n", from_y, from_x, to_y, to_x); 1172 mvcur(from_y, from_x, to_y, to_x); 1173#else 1174 mvcur(roll(lines), roll(columns), roll(lines), roll(columns)); 1175#endif /* FIND_COREDUMP */ 1176 if (diff) 1177 cumtime += diff; 1178 } 1179 profiling = FALSE; 1180 1181 /* 1182 * Average milliseconds per character optimization time. 1183 * This is the key figure to watch when tuning the optimizer. 1184 */ 1185 perchar = cumtime / n; 1186 1187 (void) printf("%d moves (%ld chars) in %d msec, %f msec each:\n", 1188 n, xmits, (int) cumtime, perchar); 1189 1190 for (i = 0; speeds[i]; i++) { 1191 /* 1192 * Total estimated time for the moves, computation and 1193 * transmission both. Transmission time is an estimate 1194 * assuming 9 bits/char, 8 bits + 1 stop bit. 1195 */ 1196 float totalest = cumtime + xmits * 9 * 1e6 / speeds[i]; 1197 1198 /* 1199 * Per-character optimization overhead in character transmits 1200 * at the current speed. Round this to the nearest integer 1201 * to figure COMPUTE_OVERHEAD for the speed. 1202 */ 1203 float overhead = speeds[i] * perchar / 1e6; 1204 1205 (void) 1206 printf("%6d bps: %3.2f char-xmits overhead; total estimated time %15.2f\n", 1207 speeds[i], overhead, totalest); 1208 } 1209 } else if (buf[0] == 'c') { 1210 (void) printf("char padding: %d\n", SP->_char_padding); 1211 (void) printf("cr cost: %d\n", SP->_cr_cost); 1212 (void) printf("cup cost: %d\n", SP->_cup_cost); 1213 (void) printf("home cost: %d\n", SP->_home_cost); 1214 (void) printf("ll cost: %d\n", SP->_ll_cost); 1215#if USE_HARD_TABS 1216 (void) printf("ht cost: %d\n", SP->_ht_cost); 1217 (void) printf("cbt cost: %d\n", SP->_cbt_cost); 1218#endif /* USE_HARD_TABS */ 1219 (void) printf("cub1 cost: %d\n", SP->_cub1_cost); 1220 (void) printf("cuf1 cost: %d\n", SP->_cuf1_cost); 1221 (void) printf("cud1 cost: %d\n", SP->_cud1_cost); 1222 (void) printf("cuu1 cost: %d\n", SP->_cuu1_cost); 1223 (void) printf("cub cost: %d\n", SP->_cub_cost); 1224 (void) printf("cuf cost: %d\n", SP->_cuf_cost); 1225 (void) printf("cud cost: %d\n", SP->_cud_cost); 1226 (void) printf("cuu cost: %d\n", SP->_cuu_cost); 1227 (void) printf("hpa cost: %d\n", SP->_hpa_cost); 1228 (void) printf("vpa cost: %d\n", SP->_vpa_cost); 1229 } else if (buf[0] == 'x' || buf[0] == 'q') 1230 break; 1231 else 1232 (void) puts("Invalid command."); 1233 } 1234 1235 (void) fputs("rmcup:", stdout); 1236 _nc_mvcur_wrap(); 1237 putchar('\n'); 1238 1239 return (0); 1240} 1241 1242#endif /* MAIN */ 1243 1244/* lib_mvcur.c ends here */ 1245