1/**************************************************************************** 2 * Copyright (c) 1998-2012,2013 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 * and: Juergen Pfeifer 2009 * 34 ****************************************************************************/ 35 36/* 37** lib_mvcur.c 38** 39** The routines for moving the physical cursor and scrolling: 40** 41** void _nc_mvcur_init(void) 42** 43** void _nc_mvcur_resume(void) 44** 45** int mvcur(int old_y, int old_x, int new_y, int new_x) 46** 47** void _nc_mvcur_wrap(void) 48** 49** Comparisons with older movement optimizers: 50** SVr3 curses mvcur() can't use cursor_to_ll or auto_left_margin. 51** 4.4BSD curses can't use cuu/cud/cuf/cub/hpa/vpa/tab/cbt for local 52** motions. It doesn't use tactics based on auto_left_margin. Weirdly 53** enough, it doesn't use its own hardware-scrolling routine to scroll up 54** destination lines for out-of-bounds addresses! 55** old ncurses optimizer: less accurate cost computations (in fact, 56** it was broken and had to be commented out!). 57** 58** Compile with -DMAIN to build an interactive tester/timer for the movement 59** optimizer. You can use it to investigate the optimizer's behavior. 60** You can also use it for tuning the formulas used to determine whether 61** or not full optimization is attempted. 62** 63** This code has a nasty tendency to find bugs in terminfo entries, because it 64** exercises the non-cup movement capabilities heavily. If you think you've 65** found a bug, try deleting subsets of the following capabilities (arranged 66** in decreasing order of suspiciousness): it, tab, cbt, hpa, vpa, cuu, cud, 67** cuf, cub, cuu1, cud1, cuf1, cub1. It may be that one or more are wrong. 68** 69** Note: you should expect this code to look like a resource hog in a profile. 70** That's because it does a lot of I/O, through the tputs() calls. The I/O 71** cost swamps the computation overhead (and as machines get faster, this 72** will become even more true). Comments in the test exerciser at the end 73** go into detail about tuning and how you can gauge the optimizer's 74** effectiveness. 75**/ 76 77/**************************************************************************** 78 * 79 * Constants and macros for optimizer tuning. 80 * 81 ****************************************************************************/ 82 83/* 84 * The average overhead of a full optimization computation in character 85 * transmission times. If it's too high, the algorithm will be a bit 86 * over-biased toward using cup rather than local motions; if it's too 87 * low, the algorithm may spend more time than is strictly optimal 88 * looking for non-cup motions. Profile the optimizer using the `t' 89 * command of the exerciser (see below), and round to the nearest integer. 90 * 91 * Yes, I (esr) thought about computing expected overhead dynamically, say 92 * by derivation from a running average of optimizer times. But the 93 * whole point of this optimization is to *decrease* the frequency of 94 * system calls. :-) 95 */ 96#define COMPUTE_OVERHEAD 1 /* I use a 90MHz Pentium @ 9.6Kbps */ 97 98/* 99 * LONG_DIST is the distance we consider to be just as costly to move over as a 100 * cup sequence is to emit. In other words, it's the length of a cup sequence 101 * adjusted for average computation overhead. The magic number is the length 102 * of "\033[yy;xxH", the typical cup sequence these days. 103 */ 104#define LONG_DIST (8 - COMPUTE_OVERHEAD) 105 106/* 107 * Tell whether a motion is optimizable by local motions. Needs to be cheap to 108 * compute. In general, all the fast moves go to either the right or left edge 109 * of the screen. So any motion to a location that is (a) further away than 110 * LONG_DIST and (b) further inward from the right or left edge than LONG_DIST, 111 * we'll consider nonlocal. 112 */ 113#define NOT_LOCAL(sp, fy, fx, ty, tx) ((tx > LONG_DIST) \ 114 && (tx < screen_columns(sp) - 1 - LONG_DIST) \ 115 && (abs(ty-fy) + abs(tx-fx) > LONG_DIST)) 116 117/**************************************************************************** 118 * 119 * External interfaces 120 * 121 ****************************************************************************/ 122 123/* 124 * For this code to work OK, the following components must live in the 125 * screen structure: 126 * 127 * int _char_padding; // cost of character put 128 * int _cr_cost; // cost of (carriage_return) 129 * int _cup_cost; // cost of (cursor_address) 130 * int _home_cost; // cost of (cursor_home) 131 * int _ll_cost; // cost of (cursor_to_ll) 132 *#if USE_HARD_TABS 133 * int _ht_cost; // cost of (tab) 134 * int _cbt_cost; // cost of (back_tab) 135 *#endif USE_HARD_TABS 136 * int _cub1_cost; // cost of (cursor_left) 137 * int _cuf1_cost; // cost of (cursor_right) 138 * int _cud1_cost; // cost of (cursor_down) 139 * int _cuu1_cost; // cost of (cursor_up) 140 * int _cub_cost; // cost of (parm_cursor_left) 141 * int _cuf_cost; // cost of (parm_cursor_right) 142 * int _cud_cost; // cost of (parm_cursor_down) 143 * int _cuu_cost; // cost of (parm_cursor_up) 144 * int _hpa_cost; // cost of (column_address) 145 * int _vpa_cost; // cost of (row_address) 146 * int _ech_cost; // cost of (erase_chars) 147 * int _rep_cost; // cost of (repeat_char) 148 * 149 * The USE_HARD_TABS switch controls whether it is reliable to use tab/backtabs 150 * for local motions. On many systems, it's not, due to uncertainties about 151 * tab delays and whether or not tabs will be expanded in raw mode. If you 152 * have parm_right_cursor, tab motions don't win you a lot anyhow. 153 */ 154 155#include <curses.priv.h> 156#include <ctype.h> 157 158#ifndef CUR 159#define CUR SP_TERMTYPE 160#endif 161 162MODULE_ID("$Id: lib_mvcur.c,v 1.133 2013/05/25 23:59:41 tom Exp $") 163 164#define WANT_CHAR(sp, y, x) NewScreen(sp)->_line[y].text[x] /* desired state */ 165 166#if NCURSES_SP_FUNCS 167#define BAUDRATE(sp) sp->_term->_baudrate /* bits per second */ 168#else 169#define BAUDRATE(sp) cur_term->_baudrate /* bits per second */ 170#endif 171 172#if defined(MAIN) || defined(NCURSES_TEST) 173#include <sys/time.h> 174 175static bool profiling = FALSE; 176static float diff; 177#endif /* MAIN */ 178 179#undef NCURSES_OUTC_FUNC 180#define NCURSES_OUTC_FUNC myOutCh 181 182#define OPT_SIZE 512 183 184static int normalized_cost(NCURSES_SP_DCLx const char *const cap, int affcnt); 185 186/**************************************************************************** 187 * 188 * Initialization/wrapup (including cost pre-computation) 189 * 190 ****************************************************************************/ 191 192#ifdef TRACE 193static int 194trace_cost_of(NCURSES_SP_DCLx const char *capname, const char *cap, int affcnt) 195{ 196 int result = NCURSES_SP_NAME(_nc_msec_cost) (NCURSES_SP_ARGx cap, affcnt); 197 TR(TRACE_CHARPUT | TRACE_MOVE, 198 ("CostOf %s %d %s", capname, result, _nc_visbuf(cap))); 199 return result; 200} 201#define CostOf(cap,affcnt) trace_cost_of(NCURSES_SP_ARGx #cap, cap, affcnt) 202 203static int 204trace_normalized_cost(NCURSES_SP_DCLx const char *capname, const char *cap, int affcnt) 205{ 206 int result = normalized_cost(NCURSES_SP_ARGx cap, affcnt); 207 TR(TRACE_CHARPUT | TRACE_MOVE, 208 ("NormalizedCost %s %d %s", capname, result, _nc_visbuf(cap))); 209 return result; 210} 211#define NormalizedCost(cap,affcnt) trace_normalized_cost(NCURSES_SP_ARGx #cap, cap, affcnt) 212 213#else 214 215#define CostOf(cap,affcnt) NCURSES_SP_NAME(_nc_msec_cost)(NCURSES_SP_ARGx cap, affcnt) 216#define NormalizedCost(cap,affcnt) normalized_cost(NCURSES_SP_ARGx cap, affcnt) 217 218#endif 219 220NCURSES_EXPORT(int) 221NCURSES_SP_NAME(_nc_msec_cost) (NCURSES_SP_DCLx const char *const cap, int affcnt) 222/* compute the cost of a given operation */ 223{ 224 if (cap == 0) 225 return (INFINITY); 226 else { 227 const char *cp; 228 float cum_cost = 0.0; 229 230 for (cp = cap; *cp; cp++) { 231 /* extract padding, either mandatory or required */ 232 if (cp[0] == '$' && cp[1] == '<' && strchr(cp, '>')) { 233 float number = 0.0; 234 235 for (cp += 2; *cp != '>'; cp++) { 236 if (isdigit(UChar(*cp))) 237 number = number * 10 + (float) (*cp - '0'); 238 else if (*cp == '*') 239 number *= (float) affcnt; 240 else if (*cp == '.' && (*++cp != '>') && isdigit(UChar(*cp))) 241 number += (float) ((*cp - '0') / 10.0); 242 } 243 244#if NCURSES_NO_PADDING 245 if (!GetNoPadding(SP_PARM)) 246#endif 247 cum_cost += number * 10; 248 } else if (SP_PARM) { 249 cum_cost += (float) SP_PARM->_char_padding; 250 } 251 } 252 253 return ((int) cum_cost); 254 } 255} 256 257#if NCURSES_SP_FUNCS 258NCURSES_EXPORT(int) 259_nc_msec_cost(const char *const cap, int affcnt) 260{ 261 return NCURSES_SP_NAME(_nc_msec_cost) (CURRENT_SCREEN, cap, affcnt); 262} 263#endif 264 265static int 266normalized_cost(NCURSES_SP_DCLx const char *const cap, int affcnt) 267/* compute the effective character-count for an operation (round up) */ 268{ 269 int cost = NCURSES_SP_NAME(_nc_msec_cost) (NCURSES_SP_ARGx cap, affcnt); 270 if (cost != INFINITY) 271 cost = (cost + SP_PARM->_char_padding - 1) / SP_PARM->_char_padding; 272 return cost; 273} 274 275static void 276reset_scroll_region(NCURSES_SP_DCL0) 277/* Set the scroll-region to a known state (the default) */ 278{ 279 if (change_scroll_region) { 280 NCURSES_PUTP2("change_scroll_region", 281 TPARM_2(change_scroll_region, 282 0, screen_lines(SP_PARM) - 1)); 283 } 284} 285 286NCURSES_EXPORT(void) 287NCURSES_SP_NAME(_nc_mvcur_resume) (NCURSES_SP_DCL0) 288/* what to do at initialization time and after each shellout */ 289{ 290 if (!SP_PARM || !IsTermInfo(SP_PARM)) 291 return; 292 293 /* initialize screen for cursor access */ 294 if (enter_ca_mode) { 295 NCURSES_PUTP2("enter_ca_mode", enter_ca_mode); 296 } 297 298 /* 299 * Doing this here rather than in _nc_mvcur_wrap() ensures that 300 * ncurses programs will see a reset scroll region even if a 301 * program that messed with it died ungracefully. 302 * 303 * This also undoes the effects of terminal init strings that assume 304 * they know the screen size. This is useful when you're running 305 * a vt100 emulation through xterm. 306 */ 307 reset_scroll_region(NCURSES_SP_ARG); 308 SP_PARM->_cursrow = SP_PARM->_curscol = -1; 309 310 /* restore cursor shape */ 311 if (SP_PARM->_cursor != -1) { 312 int cursor = SP_PARM->_cursor; 313 SP_PARM->_cursor = -1; 314 NCURSES_SP_NAME(curs_set) (NCURSES_SP_ARGx cursor); 315 } 316} 317 318#if NCURSES_SP_FUNCS 319NCURSES_EXPORT(void) 320_nc_mvcur_resume(void) 321{ 322 NCURSES_SP_NAME(_nc_mvcur_resume) (CURRENT_SCREEN); 323} 324#endif 325 326NCURSES_EXPORT(void) 327NCURSES_SP_NAME(_nc_mvcur_init) (NCURSES_SP_DCL0) 328/* initialize the cost structure */ 329{ 330 if (SP_PARM->_ofp && isatty(fileno(SP_PARM->_ofp))) { 331 SP_PARM->_char_padding = ((BAUDBYTE * 1000 * 10) 332 / (BAUDRATE(SP_PARM) > 0 333 ? BAUDRATE(SP_PARM) 334 : 9600)); 335 } else { 336 SP_PARM->_char_padding = 1; /* must be nonzero */ 337 } 338 if (SP_PARM->_char_padding <= 0) 339 SP_PARM->_char_padding = 1; /* must be nonzero */ 340 TR(TRACE_CHARPUT | TRACE_MOVE, ("char_padding %d msecs", SP_PARM->_char_padding)); 341 342 /* non-parameterized local-motion strings */ 343 SP_PARM->_cr_cost = CostOf(carriage_return, 0); 344 SP_PARM->_home_cost = CostOf(cursor_home, 0); 345 SP_PARM->_ll_cost = CostOf(cursor_to_ll, 0); 346#if USE_HARD_TABS 347 if (getenv("NCURSES_NO_HARD_TABS") == 0) { 348 SP_PARM->_ht_cost = CostOf(tab, 0); 349 SP_PARM->_cbt_cost = CostOf(back_tab, 0); 350 } else { 351 SP_PARM->_ht_cost = INFINITY; 352 SP_PARM->_cbt_cost = INFINITY; 353 } 354#endif /* USE_HARD_TABS */ 355 SP_PARM->_cub1_cost = CostOf(cursor_left, 0); 356 SP_PARM->_cuf1_cost = CostOf(cursor_right, 0); 357 SP_PARM->_cud1_cost = CostOf(cursor_down, 0); 358 SP_PARM->_cuu1_cost = CostOf(cursor_up, 0); 359 360 SP_PARM->_smir_cost = CostOf(enter_insert_mode, 0); 361 SP_PARM->_rmir_cost = CostOf(exit_insert_mode, 0); 362 SP_PARM->_ip_cost = 0; 363 if (insert_padding) { 364 SP_PARM->_ip_cost = CostOf(insert_padding, 0); 365 } 366 367 /* 368 * Assumption: if the terminal has memory_relative addressing, the 369 * initialization strings or smcup will set single-page mode so we 370 * can treat it like absolute screen addressing. This seems to be true 371 * for all cursor_mem_address terminal types in the terminfo database. 372 */ 373 SP_PARM->_address_cursor = cursor_address ? cursor_address : cursor_mem_address; 374 375 /* 376 * Parametrized local-motion strings. This static cost computation 377 * depends on the following assumptions: 378 * 379 * (1) They never have * padding. In the entire master terminfo database 380 * as of March 1995, only the obsolete Zenith Z-100 pc violates this. 381 * (Proportional padding is found mainly in insert, delete and scroll 382 * capabilities). 383 * 384 * (2) The average case of cup has two two-digit parameters. Strictly, 385 * the average case for a 24 * 80 screen has ((10*10*(1 + 1)) + 386 * (14*10*(1 + 2)) + (10*70*(2 + 1)) + (14*70*4)) / (24*80) = 3.458 387 * digits of parameters. On a 25x80 screen the average is 3.6197. 388 * On larger screens the value gets much closer to 4. 389 * 390 * (3) The average case of cub/cuf/hpa/ech/rep has 2 digits of parameters 391 * (strictly, (((10 * 1) + (70 * 2)) / 80) = 1.8750). 392 * 393 * (4) The average case of cud/cuu/vpa has 2 digits of parameters 394 * (strictly, (((10 * 1) + (14 * 2)) / 24) = 1.5833). 395 * 396 * All these averages depend on the assumption that all parameter values 397 * are equally probable. 398 */ 399 SP_PARM->_cup_cost = CostOf(TPARM_2(SP_PARM->_address_cursor, 23, 23), 1); 400 SP_PARM->_cub_cost = CostOf(TPARM_1(parm_left_cursor, 23), 1); 401 SP_PARM->_cuf_cost = CostOf(TPARM_1(parm_right_cursor, 23), 1); 402 SP_PARM->_cud_cost = CostOf(TPARM_1(parm_down_cursor, 23), 1); 403 SP_PARM->_cuu_cost = CostOf(TPARM_1(parm_up_cursor, 23), 1); 404 SP_PARM->_hpa_cost = CostOf(TPARM_1(column_address, 23), 1); 405 SP_PARM->_vpa_cost = CostOf(TPARM_1(row_address, 23), 1); 406 407 /* non-parameterized screen-update strings */ 408 SP_PARM->_ed_cost = NormalizedCost(clr_eos, 1); 409 SP_PARM->_el_cost = NormalizedCost(clr_eol, 1); 410 SP_PARM->_el1_cost = NormalizedCost(clr_bol, 1); 411 SP_PARM->_dch1_cost = NormalizedCost(delete_character, 1); 412 SP_PARM->_ich1_cost = NormalizedCost(insert_character, 1); 413 414 /* 415 * If this is a bce-terminal, we want to bias the choice so we use clr_eol 416 * rather than spaces at the end of a line. 417 */ 418 if (back_color_erase) 419 SP_PARM->_el_cost = 0; 420 421 /* parameterized screen-update strings */ 422 SP_PARM->_dch_cost = NormalizedCost(TPARM_1(parm_dch, 23), 1); 423 SP_PARM->_ich_cost = NormalizedCost(TPARM_1(parm_ich, 23), 1); 424 SP_PARM->_ech_cost = NormalizedCost(TPARM_1(erase_chars, 23), 1); 425 SP_PARM->_rep_cost = NormalizedCost(TPARM_2(repeat_char, ' ', 23), 1); 426 427 SP_PARM->_cup_ch_cost = NormalizedCost( 428 TPARM_2(SP_PARM->_address_cursor, 429 23, 23), 430 1); 431 SP_PARM->_hpa_ch_cost = NormalizedCost(TPARM_1(column_address, 23), 1); 432 SP_PARM->_cuf_ch_cost = NormalizedCost(TPARM_1(parm_right_cursor, 23), 1); 433 SP_PARM->_inline_cost = min(SP_PARM->_cup_ch_cost, 434 min(SP_PARM->_hpa_ch_cost, 435 SP_PARM->_cuf_ch_cost)); 436 437 /* 438 * If save_cursor is used within enter_ca_mode, we should not use it for 439 * scrolling optimization, since the corresponding restore_cursor is not 440 * nested on the various terminals (vt100, xterm, etc.) which use this 441 * feature. 442 */ 443 if (save_cursor != 0 444 && enter_ca_mode != 0 445 && strstr(enter_ca_mode, save_cursor) != 0) { 446 T(("...suppressed sc/rc capability due to conflict with smcup/rmcup")); 447 save_cursor = 0; 448 restore_cursor = 0; 449 } 450 451 /* 452 * A different, possibly better way to arrange this would be to set the 453 * SCREEN's _endwin to TRUE at window initialization time and let this be 454 * called by doupdate's return-from-shellout code. 455 */ 456 NCURSES_SP_NAME(_nc_mvcur_resume) (NCURSES_SP_ARG); 457} 458 459#if NCURSES_SP_FUNCS 460NCURSES_EXPORT(void) 461_nc_mvcur_init(void) 462{ 463 NCURSES_SP_NAME(_nc_mvcur_init) (CURRENT_SCREEN); 464} 465#endif 466 467NCURSES_EXPORT(void) 468NCURSES_SP_NAME(_nc_mvcur_wrap) (NCURSES_SP_DCL0) 469/* wrap up cursor-addressing mode */ 470{ 471 /* leave cursor at screen bottom */ 472 TINFO_MVCUR(NCURSES_SP_ARGx -1, -1, screen_lines(SP_PARM) - 1, 0); 473 474 if (!SP_PARM || !IsTermInfo(SP_PARM)) 475 return; 476 477 /* set cursor to normal mode */ 478 if (SP_PARM->_cursor != -1) { 479 int cursor = SP_PARM->_cursor; 480 NCURSES_SP_NAME(curs_set) (NCURSES_SP_ARGx 1); 481 SP_PARM->_cursor = cursor; 482 } 483 484 if (exit_ca_mode) { 485 NCURSES_PUTP2("exit_ca_mode", exit_ca_mode); 486 } 487 /* 488 * Reset terminal's tab counter. There's a long-time bug that 489 * if you exit a "curses" program such as vi or more, tab 490 * forward, and then backspace, the cursor doesn't go to the 491 * right place. The problem is that the kernel counts the 492 * escape sequences that reset things as column positions. 493 * Utter a \r to reset this invisibly. 494 */ 495 NCURSES_SP_NAME(_nc_outch) (NCURSES_SP_ARGx '\r'); 496} 497 498#if NCURSES_SP_FUNCS 499NCURSES_EXPORT(void) 500_nc_mvcur_wrap(void) 501{ 502 NCURSES_SP_NAME(_nc_mvcur_wrap) (CURRENT_SCREEN); 503} 504#endif 505 506/**************************************************************************** 507 * 508 * Optimized cursor movement 509 * 510 ****************************************************************************/ 511 512/* 513 * Perform repeated-append, returning cost 514 */ 515static NCURSES_INLINE int 516repeated_append(string_desc * target, int total, int num, int repeat, const char *src) 517{ 518 size_t need = (size_t) repeat * strlen(src); 519 520 if (need < target->s_size) { 521 while (repeat-- > 0) { 522 if (_nc_safe_strcat(target, src)) { 523 total += num; 524 } else { 525 total = INFINITY; 526 break; 527 } 528 } 529 } else { 530 total = INFINITY; 531 } 532 return total; 533} 534 535#ifndef NO_OPTIMIZE 536#define NEXTTAB(fr) (fr + init_tabs - (fr % init_tabs)) 537 538/* 539 * Assume back_tab (CBT) does not wrap backwards at the left margin, return 540 * a negative value at that point to simplify the loop. 541 */ 542#define LASTTAB(fr) ((fr > 0) ? ((fr - 1) / init_tabs) * init_tabs : -1) 543 544static int 545relative_move(NCURSES_SP_DCLx 546 string_desc * target, 547 int from_y, 548 int from_x, 549 int to_y, 550 int to_x, 551 int ovw) 552/* move via local motions (cuu/cuu1/cud/cud1/cub1/cub/cuf1/cuf/vpa/hpa) */ 553{ 554 string_desc save; 555 int n, vcost = 0, hcost = 0; 556 557 (void) _nc_str_copy(&save, target); 558 559 if (to_y != from_y) { 560 vcost = INFINITY; 561 562 if (row_address != 0 563 && _nc_safe_strcat(target, TPARM_1(row_address, to_y))) { 564 vcost = SP_PARM->_vpa_cost; 565 } 566 567 if (to_y > from_y) { 568 n = (to_y - from_y); 569 570 if (parm_down_cursor 571 && SP_PARM->_cud_cost < vcost 572 && _nc_safe_strcat(_nc_str_copy(target, &save), 573 TPARM_1(parm_down_cursor, n))) { 574 vcost = SP_PARM->_cud_cost; 575 } 576 577 if (cursor_down 578 && (*cursor_down != '\n' || SP_PARM->_nl) 579 && (n * SP_PARM->_cud1_cost < vcost)) { 580 vcost = repeated_append(_nc_str_copy(target, &save), 0, 581 SP_PARM->_cud1_cost, n, cursor_down); 582 } 583 } else { /* (to_y < from_y) */ 584 n = (from_y - to_y); 585 586 if (parm_up_cursor 587 && SP_PARM->_cuu_cost < vcost 588 && _nc_safe_strcat(_nc_str_copy(target, &save), 589 TPARM_1(parm_up_cursor, n))) { 590 vcost = SP_PARM->_cuu_cost; 591 } 592 593 if (cursor_up && (n * SP_PARM->_cuu1_cost < vcost)) { 594 vcost = repeated_append(_nc_str_copy(target, &save), 0, 595 SP_PARM->_cuu1_cost, n, cursor_up); 596 } 597 } 598 599 if (vcost == INFINITY) 600 return (INFINITY); 601 } 602 603 save = *target; 604 605 if (to_x != from_x) { 606 char str[OPT_SIZE]; 607 string_desc check; 608 609 hcost = INFINITY; 610 611 if (column_address 612 && _nc_safe_strcat(_nc_str_copy(target, &save), 613 TPARM_1(column_address, to_x))) { 614 hcost = SP_PARM->_hpa_cost; 615 } 616 617 if (to_x > from_x) { 618 n = to_x - from_x; 619 620 if (parm_right_cursor 621 && SP_PARM->_cuf_cost < hcost 622 && _nc_safe_strcat(_nc_str_copy(target, &save), 623 TPARM_1(parm_right_cursor, n))) { 624 hcost = SP_PARM->_cuf_cost; 625 } 626 627 if (cursor_right) { 628 int lhcost = 0; 629 630 (void) _nc_str_init(&check, str, sizeof(str)); 631 632#if USE_HARD_TABS 633 /* use hard tabs, if we have them, to do as much as possible */ 634 if (init_tabs > 0 && tab) { 635 int nxt, fr; 636 637 for (fr = from_x; (nxt = NEXTTAB(fr)) <= to_x; fr = nxt) { 638 lhcost = repeated_append(&check, lhcost, 639 SP_PARM->_ht_cost, 1, tab); 640 if (lhcost == INFINITY) 641 break; 642 } 643 644 n = to_x - fr; 645 from_x = fr; 646 } 647#endif /* USE_HARD_TABS */ 648 649 if (n <= 0 || n >= (int) check.s_size) 650 ovw = FALSE; 651#if BSD_TPUTS 652 /* 653 * If we're allowing BSD-style padding in tputs, don't generate 654 * a string with a leading digit. Otherwise, that will be 655 * interpreted as a padding value rather than sent to the 656 * screen. 657 */ 658 if (ovw 659 && n > 0 660 && n < (int) check.s_size 661 && vcost == 0 662 && str[0] == '\0') { 663 int wanted = CharOf(WANT_CHAR(SP_PARM, to_y, from_x)); 664 if (is8bits(wanted) && isdigit(wanted)) 665 ovw = FALSE; 666 } 667#endif 668 /* 669 * If we have no attribute changes, overwrite is cheaper. 670 * Note: must suppress this by passing in ovw = FALSE whenever 671 * WANT_CHAR would return invalid data. In particular, this 672 * is true between the time a hardware scroll has been done 673 * and the time the structure WANT_CHAR would access has been 674 * updated. 675 */ 676 if (ovw) { 677 int i; 678 679 for (i = 0; i < n; i++) { 680 NCURSES_CH_T ch = WANT_CHAR(SP_PARM, to_y, from_x + i); 681 if (!SameAttrOf(ch, SCREEN_ATTRS(SP_PARM)) 682#if USE_WIDEC_SUPPORT 683 || !Charable(ch) 684#endif 685 ) { 686 ovw = FALSE; 687 break; 688 } 689 } 690 } 691 if (ovw) { 692 int i; 693 694 for (i = 0; i < n; i++) 695 *check.s_tail++ = (char) CharOf(WANT_CHAR(SP_PARM, to_y, 696 from_x + i)); 697 *check.s_tail = '\0'; 698 check.s_size -= (size_t) n; 699 lhcost += n * SP_PARM->_char_padding; 700 } else { 701 lhcost = repeated_append(&check, lhcost, SP_PARM->_cuf1_cost, 702 n, cursor_right); 703 } 704 705 if (lhcost < hcost 706 && _nc_safe_strcat(_nc_str_copy(target, &save), str)) { 707 hcost = lhcost; 708 } 709 } 710 } else { /* (to_x < from_x) */ 711 n = from_x - to_x; 712 713 if (parm_left_cursor 714 && SP_PARM->_cub_cost < hcost 715 && _nc_safe_strcat(_nc_str_copy(target, &save), 716 TPARM_1(parm_left_cursor, n))) { 717 hcost = SP_PARM->_cub_cost; 718 } 719 720 if (cursor_left) { 721 int lhcost = 0; 722 723 (void) _nc_str_init(&check, str, sizeof(str)); 724 725#if USE_HARD_TABS 726 if (init_tabs > 0 && back_tab) { 727 int nxt, fr; 728 729 for (fr = from_x; (nxt = LASTTAB(fr)) >= to_x; fr = nxt) { 730 lhcost = repeated_append(&check, lhcost, 731 SP_PARM->_cbt_cost, 732 1, back_tab); 733 if (lhcost == INFINITY) 734 break; 735 } 736 737 n = fr - to_x; 738 } 739#endif /* USE_HARD_TABS */ 740 741 lhcost = repeated_append(&check, lhcost, 742 SP_PARM->_cub1_cost, 743 n, cursor_left); 744 745 if (lhcost < hcost 746 && _nc_safe_strcat(_nc_str_copy(target, &save), str)) { 747 hcost = lhcost; 748 } 749 } 750 } 751 752 if (hcost == INFINITY) 753 return (INFINITY); 754 } 755 756 return (vcost + hcost); 757} 758#endif /* !NO_OPTIMIZE */ 759 760/* 761 * With the machinery set up above, it's conceivable that 762 * onscreen_mvcur could be modified into a recursive function that does 763 * an alpha-beta search of motion space, as though it were a chess 764 * move tree, with the weight function being boolean and the search 765 * depth equated to length of string. However, this would jack up the 766 * computation cost a lot, especially on terminals without a cup 767 * capability constraining the search tree depth. So we settle for 768 * the simpler method below. 769 */ 770 771static NCURSES_INLINE int 772onscreen_mvcur(NCURSES_SP_DCLx 773 int yold, int xold, 774 int ynew, int xnew, int ovw, 775 NCURSES_SP_OUTC myOutCh) 776/* onscreen move from (yold, xold) to (ynew, xnew) */ 777{ 778 string_desc result; 779 char buffer[OPT_SIZE]; 780 int tactic = 0, newcost, usecost = INFINITY; 781 int t5_cr_cost; 782 783#if defined(MAIN) || defined(NCURSES_TEST) 784 struct timeval before, after; 785 786 gettimeofday(&before, NULL); 787#endif /* MAIN */ 788 789#define NullResult _nc_str_null(&result, sizeof(buffer)) 790#define InitResult _nc_str_init(&result, buffer, sizeof(buffer)) 791 792 /* tactic #0: use direct cursor addressing */ 793 if (_nc_safe_strcpy(InitResult, TPARM_2(SP_PARM->_address_cursor, ynew, xnew))) { 794 tactic = 0; 795 usecost = SP_PARM->_cup_cost; 796 797#if defined(TRACE) || defined(NCURSES_TEST) 798 if (!(_nc_optimize_enable & OPTIMIZE_MVCUR)) 799 goto nonlocal; 800#endif /* TRACE */ 801 802 /* 803 * We may be able to tell in advance that the full optimization 804 * will probably not be worth its overhead. Also, don't try to 805 * use local movement if the current attribute is anything but 806 * A_NORMAL...there are just too many ways this can screw up 807 * (like, say, local-movement \n getting mapped to some obscure 808 * character because A_ALTCHARSET is on). 809 */ 810 if (yold == -1 || xold == -1 || NOT_LOCAL(SP_PARM, yold, xold, ynew, xnew)) { 811#if defined(MAIN) || defined(NCURSES_TEST) 812 if (!profiling) { 813 (void) fputs("nonlocal\n", stderr); 814 goto nonlocal; /* always run the optimizer if profiling */ 815 } 816#else 817 goto nonlocal; 818#endif /* MAIN */ 819 } 820 } 821#ifndef NO_OPTIMIZE 822 /* tactic #1: use local movement */ 823 if (yold != -1 && xold != -1 824 && ((newcost = relative_move(NCURSES_SP_ARGx 825 NullResult, 826 yold, xold, 827 ynew, xnew, ovw)) != INFINITY) 828 && newcost < usecost) { 829 tactic = 1; 830 usecost = newcost; 831 } 832 833 /* tactic #2: use carriage-return + local movement */ 834 if (yold != -1 && carriage_return 835 && ((newcost = relative_move(NCURSES_SP_ARGx 836 NullResult, 837 yold, 0, 838 ynew, xnew, ovw)) != INFINITY) 839 && SP_PARM->_cr_cost + newcost < usecost) { 840 tactic = 2; 841 usecost = SP_PARM->_cr_cost + newcost; 842 } 843 844 /* tactic #3: use home-cursor + local movement */ 845 if (cursor_home 846 && ((newcost = relative_move(NCURSES_SP_ARGx 847 NullResult, 848 0, 0, 849 ynew, xnew, ovw)) != INFINITY) 850 && SP_PARM->_home_cost + newcost < usecost) { 851 tactic = 3; 852 usecost = SP_PARM->_home_cost + newcost; 853 } 854 855 /* tactic #4: use home-down + local movement */ 856 if (cursor_to_ll 857 && ((newcost = relative_move(NCURSES_SP_ARGx 858 NullResult, 859 screen_lines(SP_PARM) - 1, 0, 860 ynew, xnew, ovw)) != INFINITY) 861 && SP_PARM->_ll_cost + newcost < usecost) { 862 tactic = 4; 863 usecost = SP_PARM->_ll_cost + newcost; 864 } 865 866 /* 867 * tactic #5: use left margin for wrap to right-hand side, 868 * unless strange wrap behavior indicated by xenl might hose us. 869 */ 870 t5_cr_cost = (xold > 0 ? SP_PARM->_cr_cost : 0); 871 if (auto_left_margin && !eat_newline_glitch 872 && yold > 0 && cursor_left 873 && ((newcost = relative_move(NCURSES_SP_ARGx 874 NullResult, 875 yold - 1, screen_columns(SP_PARM) - 1, 876 ynew, xnew, ovw)) != INFINITY) 877 && t5_cr_cost + SP_PARM->_cub1_cost + newcost < usecost) { 878 tactic = 5; 879 usecost = t5_cr_cost + SP_PARM->_cub1_cost + newcost; 880 } 881 882 /* 883 * These cases are ordered by estimated relative frequency. 884 */ 885 if (tactic) 886 InitResult; 887 switch (tactic) { 888 case 1: 889 (void) relative_move(NCURSES_SP_ARGx 890 &result, 891 yold, xold, 892 ynew, xnew, ovw); 893 break; 894 case 2: 895 (void) _nc_safe_strcpy(&result, carriage_return); 896 (void) relative_move(NCURSES_SP_ARGx 897 &result, 898 yold, 0, 899 ynew, xnew, ovw); 900 break; 901 case 3: 902 (void) _nc_safe_strcpy(&result, cursor_home); 903 (void) relative_move(NCURSES_SP_ARGx 904 &result, 0, 0, 905 ynew, xnew, ovw); 906 break; 907 case 4: 908 (void) _nc_safe_strcpy(&result, cursor_to_ll); 909 (void) relative_move(NCURSES_SP_ARGx 910 &result, 911 screen_lines(SP_PARM) - 1, 0, 912 ynew, xnew, ovw); 913 break; 914 case 5: 915 if (xold > 0) 916 (void) _nc_safe_strcat(&result, carriage_return); 917 (void) _nc_safe_strcat(&result, cursor_left); 918 (void) relative_move(NCURSES_SP_ARGx 919 &result, 920 yold - 1, screen_columns(SP_PARM) - 1, 921 ynew, xnew, ovw); 922 break; 923 } 924#endif /* !NO_OPTIMIZE */ 925 926 nonlocal: 927#if defined(MAIN) || defined(NCURSES_TEST) 928 gettimeofday(&after, NULL); 929 diff = after.tv_usec - before.tv_usec 930 + (after.tv_sec - before.tv_sec) * 1000000; 931 if (!profiling) 932 (void) fprintf(stderr, 933 "onscreen: %d microsec, %f 28.8Kbps char-equivalents\n", 934 (int) diff, diff / 288); 935#endif /* MAIN */ 936 937 if (usecost != INFINITY) { 938 TPUTS_TRACE("mvcur"); 939 NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx 940 buffer, 1, myOutCh); 941 SP_PARM->_cursrow = ynew; 942 SP_PARM->_curscol = xnew; 943 return (OK); 944 } else 945 return (ERR); 946} 947 948/* 949 * optimized cursor move from (yold, xold) to (ynew, xnew) 950 */ 951static int 952_nc_real_mvcur(NCURSES_SP_DCLx 953 int yold, int xold, 954 int ynew, int xnew, 955 NCURSES_SP_OUTC myOutCh, 956 int ovw) 957{ 958 NCURSES_CH_T oldattr; 959 int code; 960 961 TR(TRACE_CALLS | TRACE_MOVE, (T_CALLED("_nc_tinfo_mvcur(%p,%d,%d,%d,%d)"), 962 (void *) SP_PARM, yold, xold, ynew, xnew)); 963 964 if (SP_PARM == 0) { 965 code = ERR; 966 } else if (yold == ynew && xold == xnew) { 967 code = OK; 968 } else { 969 970 /* 971 * Most work here is rounding for terminal boundaries getting the 972 * column position implied by wraparound or the lack thereof and 973 * rolling up the screen to get ynew on the screen. 974 */ 975 if (xnew >= screen_columns(SP_PARM)) { 976 ynew += xnew / screen_columns(SP_PARM); 977 xnew %= screen_columns(SP_PARM); 978 } 979 980 /* 981 * Force restore even if msgr is on when we're in an alternate 982 * character set -- these have a strong tendency to screw up the CR & 983 * LF used for local character motions! 984 */ 985 oldattr = SCREEN_ATTRS(SP_PARM); 986 if ((AttrOf(oldattr) & A_ALTCHARSET) 987 || (AttrOf(oldattr) && !move_standout_mode)) { 988 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move", 989 (unsigned long) AttrOf(oldattr), 990 _traceattr(AttrOf(oldattr)))); 991 (void) VIDATTR(SP_PARM, A_NORMAL, 0); 992 } 993 994 if (xold >= screen_columns(SP_PARM)) { 995 int l; 996 997 if (SP_PARM->_nl) { 998 l = (xold + 1) / screen_columns(SP_PARM); 999 yold += l; 1000 if (yold >= screen_lines(SP_PARM)) 1001 l -= (yold - screen_lines(SP_PARM) - 1); 1002 1003 if (l > 0) { 1004 if (carriage_return) { 1005 NCURSES_PUTP2("carriage_return", carriage_return); 1006 } else { 1007 myOutCh(NCURSES_SP_ARGx '\r'); 1008 } 1009 xold = 0; 1010 1011 while (l > 0) { 1012 if (newline) { 1013 NCURSES_PUTP2("newline", newline); 1014 } else { 1015 myOutCh(NCURSES_SP_ARGx '\n'); 1016 } 1017 l--; 1018 } 1019 } 1020 } else { 1021 /* 1022 * If caller set nonl(), we cannot really use newlines to 1023 * position to the next row. 1024 */ 1025 xold = -1; 1026 yold = -1; 1027 } 1028 } 1029 1030 if (yold > screen_lines(SP_PARM) - 1) 1031 yold = screen_lines(SP_PARM) - 1; 1032 if (ynew > screen_lines(SP_PARM) - 1) 1033 ynew = screen_lines(SP_PARM) - 1; 1034 1035 /* destination location is on screen now */ 1036 code = onscreen_mvcur(NCURSES_SP_ARGx yold, xold, ynew, xnew, ovw, myOutCh); 1037 1038 /* 1039 * Restore attributes if we disabled them before moving. 1040 */ 1041 if (!SameAttrOf(oldattr, SCREEN_ATTRS(SP_PARM))) { 1042 TR(TRACE_CHARPUT, ("turning on (%#lx) %s after move", 1043 (unsigned long) AttrOf(oldattr), 1044 _traceattr(AttrOf(oldattr)))); 1045 (void) VIDATTR(SP_PARM, AttrOf(oldattr), GetPair(oldattr)); 1046 } 1047 } 1048 returnCode(code); 1049} 1050 1051/* 1052 * These entrypoints are used within the library. 1053 */ 1054NCURSES_EXPORT(int) 1055NCURSES_SP_NAME(_nc_mvcur) (NCURSES_SP_DCLx 1056 int yold, int xold, 1057 int ynew, int xnew) 1058{ 1059 return _nc_real_mvcur(NCURSES_SP_ARGx yold, xold, ynew, xnew, 1060 NCURSES_SP_NAME(_nc_outch), 1061 TRUE); 1062} 1063 1064#if NCURSES_SP_FUNCS 1065NCURSES_EXPORT(int) 1066_nc_mvcur(int yold, int xold, 1067 int ynew, int xnew) 1068{ 1069 return NCURSES_SP_NAME(_nc_mvcur) (CURRENT_SCREEN, yold, xold, ynew, xnew); 1070} 1071#endif 1072 1073#if defined(USE_TERM_DRIVER) 1074/* 1075 * The terminal driver does not support the external "mvcur()". 1076 */ 1077NCURSES_EXPORT(int) 1078TINFO_MVCUR(NCURSES_SP_DCLx int yold, int xold, int ynew, int xnew) 1079{ 1080 return _nc_real_mvcur(NCURSES_SP_ARGx 1081 yold, xold, 1082 ynew, xnew, 1083 NCURSES_SP_NAME(_nc_outch), 1084 TRUE); 1085} 1086 1087#else /* !USE_TERM_DRIVER */ 1088 1089/* 1090 * These entrypoints support users of the library. 1091 */ 1092NCURSES_EXPORT(int) 1093NCURSES_SP_NAME(mvcur) (NCURSES_SP_DCLx int yold, int xold, int ynew, 1094 int xnew) 1095{ 1096 return _nc_real_mvcur(NCURSES_SP_ARGx 1097 yold, xold, 1098 ynew, xnew, 1099 NCURSES_SP_NAME(_nc_putchar), 1100 FALSE); 1101} 1102 1103#if NCURSES_SP_FUNCS 1104NCURSES_EXPORT(int) 1105mvcur(int yold, int xold, int ynew, int xnew) 1106{ 1107 return NCURSES_SP_NAME(mvcur) (CURRENT_SCREEN, yold, xold, ynew, xnew); 1108} 1109#endif 1110#endif /* USE_TERM_DRIVER */ 1111 1112#if defined(TRACE) || defined(NCURSES_TEST) 1113NCURSES_EXPORT_VAR(int) _nc_optimize_enable = OPTIMIZE_ALL; 1114#endif 1115 1116#if defined(MAIN) || defined(NCURSES_TEST) 1117/**************************************************************************** 1118 * 1119 * Movement optimizer test code 1120 * 1121 ****************************************************************************/ 1122 1123#include <tic.h> 1124#include <dump_entry.h> 1125#include <time.h> 1126 1127NCURSES_EXPORT_VAR(const char *) _nc_progname = "mvcur"; 1128 1129static unsigned long xmits; 1130 1131/* these override lib_tputs.c */ 1132NCURSES_EXPORT(int) 1133tputs(const char *string, int affcnt GCC_UNUSED, int (*outc) (int) GCC_UNUSED) 1134/* stub tputs() that dumps sequences in a visible form */ 1135{ 1136 if (profiling) 1137 xmits += strlen(string); 1138 else 1139 (void) fputs(_nc_visbuf(string), stdout); 1140 return (OK); 1141} 1142 1143NCURSES_EXPORT(int) 1144putp(const char *string) 1145{ 1146 return (tputs(string, 1, _nc_outch)); 1147} 1148 1149NCURSES_EXPORT(int) 1150_nc_outch(int ch) 1151{ 1152 putc(ch, stdout); 1153 return OK; 1154} 1155 1156NCURSES_EXPORT(int) 1157delay_output(int ms GCC_UNUSED) 1158{ 1159 return OK; 1160} 1161 1162static char tname[PATH_MAX]; 1163 1164static void 1165load_term(void) 1166{ 1167 (void) setupterm(tname, STDOUT_FILENO, NULL); 1168} 1169 1170static int 1171roll(int n) 1172{ 1173 int i, j; 1174 1175 i = (RAND_MAX / n) * n; 1176 while ((j = rand()) >= i) 1177 continue; 1178 return (j % n); 1179} 1180 1181int 1182main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED) 1183{ 1184 strcpy(tname, getenv("TERM")); 1185 load_term(); 1186 _nc_setupscreen(lines, columns, stdout, FALSE, 0); 1187 baudrate(); 1188 1189 _nc_mvcur_init(); 1190 NC_BUFFERED(FALSE); 1191 1192 (void) puts("The mvcur tester. Type ? for help"); 1193 1194 fputs("smcup:", stdout); 1195 putchar('\n'); 1196 1197 for (;;) { 1198 int fy, fx, ty, tx, n, i; 1199 char buf[BUFSIZ], capname[BUFSIZ]; 1200 1201 (void) fputs("> ", stdout); 1202 (void) fgets(buf, sizeof(buf), stdin); 1203 1204 if (buf[0] == '?') { 1205 (void) puts("? -- display this help message"); 1206 (void) 1207 puts("fy fx ty tx -- (4 numbers) display (fy,fx)->(ty,tx) move"); 1208 (void) puts("s[croll] n t b m -- display scrolling sequence"); 1209 (void) 1210 printf("r[eload] -- reload terminal info for %s\n", 1211 termname()); 1212 (void) 1213 puts("l[oad] <term> -- load terminal info for type <term>"); 1214 (void) puts("d[elete] <cap> -- delete named capability"); 1215 (void) puts("i[nspect] -- display terminal capabilities"); 1216 (void) 1217 puts("c[ost] -- dump cursor-optimization cost table"); 1218 (void) puts("o[optimize] -- toggle movement optimization"); 1219 (void) 1220 puts("t[orture] <num> -- torture-test with <num> random moves"); 1221 (void) puts("q[uit] -- quit the program"); 1222 } else if (sscanf(buf, "%d %d %d %d", &fy, &fx, &ty, &tx) == 4) { 1223 struct timeval before, after; 1224 1225 putchar('"'); 1226 1227 gettimeofday(&before, NULL); 1228 mvcur(fy, fx, ty, tx); 1229 gettimeofday(&after, NULL); 1230 1231 printf("\" (%ld msec)\n", 1232 (long) (after.tv_usec - before.tv_usec 1233 + (after.tv_sec - before.tv_sec) 1234 * 1000000)); 1235 } else if (sscanf(buf, "s %d %d %d %d", &fy, &fx, &ty, &tx) == 4) { 1236 struct timeval before, after; 1237 1238 putchar('"'); 1239 1240 gettimeofday(&before, NULL); 1241 _nc_scrolln(fy, fx, ty, tx); 1242 gettimeofday(&after, NULL); 1243 1244 printf("\" (%ld msec)\n", 1245 (long) (after.tv_usec - before.tv_usec + (after.tv_sec - 1246 before.tv_sec) 1247 * 1000000)); 1248 } else if (buf[0] == 'r') { 1249 (void) strcpy(tname, termname()); 1250 load_term(); 1251 } else if (sscanf(buf, "l %s", tname) == 1) { 1252 load_term(); 1253 } else if (sscanf(buf, "d %s", capname) == 1) { 1254 struct name_table_entry const *np = _nc_find_entry(capname, 1255 _nc_get_hash_table(FALSE)); 1256 1257 if (np == NULL) 1258 (void) printf("No such capability as \"%s\"\n", capname); 1259 else { 1260 switch (np->nte_type) { 1261 case BOOLEAN: 1262 cur_term->type.Booleans[np->nte_index] = FALSE; 1263 (void) 1264 printf("Boolean capability `%s' (%d) turned off.\n", 1265 np->nte_name, np->nte_index); 1266 break; 1267 1268 case NUMBER: 1269 cur_term->type.Numbers[np->nte_index] = ABSENT_NUMERIC; 1270 (void) printf("Number capability `%s' (%d) set to -1.\n", 1271 np->nte_name, np->nte_index); 1272 break; 1273 1274 case STRING: 1275 cur_term->type.Strings[np->nte_index] = ABSENT_STRING; 1276 (void) printf("String capability `%s' (%d) deleted.\n", 1277 np->nte_name, np->nte_index); 1278 break; 1279 } 1280 } 1281 } else if (buf[0] == 'i') { 1282 dump_init((char *) NULL, F_TERMINFO, S_TERMINFO, 70, 0, FALSE); 1283 dump_entry(&cur_term->type, FALSE, TRUE, 0, 0); 1284 putchar('\n'); 1285 } else if (buf[0] == 'o') { 1286 if (_nc_optimize_enable & OPTIMIZE_MVCUR) { 1287 _nc_optimize_enable &= ~OPTIMIZE_MVCUR; 1288 (void) puts("Optimization is now off."); 1289 } else { 1290 _nc_optimize_enable |= OPTIMIZE_MVCUR; 1291 (void) puts("Optimization is now on."); 1292 } 1293 } 1294 /* 1295 * You can use the `t' test to profile and tune the movement 1296 * optimizer. Use iteration values in three digits or more. 1297 * At above 5000 iterations the profile timing averages are stable 1298 * to within a millisecond or three. 1299 * 1300 * The `overhead' field of the report will help you pick a 1301 * COMPUTE_OVERHEAD figure appropriate for your processor and 1302 * expected line speed. The `total estimated time' is 1303 * computation time plus a character-transmission time 1304 * estimate computed from the number of transmits and the baud 1305 * rate. 1306 * 1307 * Use this together with the `o' command to get a read on the 1308 * optimizer's effectiveness. Compare the total estimated times 1309 * for `t' runs of the same length in both optimized and un-optimized 1310 * modes. As long as the optimized times are less, the optimizer 1311 * is winning. 1312 */ 1313 else if (sscanf(buf, "t %d", &n) == 1) { 1314 float cumtime = 0.0, perchar; 1315 int speeds[] = 1316 {2400, 9600, 14400, 19200, 28800, 38400, 0}; 1317 1318 srand((unsigned) (getpid() + time((time_t *) 0))); 1319 profiling = TRUE; 1320 xmits = 0; 1321 for (i = 0; i < n; i++) { 1322 /* 1323 * This does a move test between two random locations, 1324 * Random moves probably short-change the optimizer, 1325 * which will work better on the short moves probably 1326 * typical of doupdate()'s usage pattern. Still, 1327 * until we have better data... 1328 */ 1329#ifdef FIND_COREDUMP 1330 int from_y = roll(lines); 1331 int to_y = roll(lines); 1332 int from_x = roll(columns); 1333 int to_x = roll(columns); 1334 1335 printf("(%d,%d) -> (%d,%d)\n", from_y, from_x, to_y, to_x); 1336 mvcur(from_y, from_x, to_y, to_x); 1337#else 1338 mvcur(roll(lines), roll(columns), roll(lines), roll(columns)); 1339#endif /* FIND_COREDUMP */ 1340 if (diff) 1341 cumtime += diff; 1342 } 1343 profiling = FALSE; 1344 1345 /* 1346 * Average milliseconds per character optimization time. 1347 * This is the key figure to watch when tuning the optimizer. 1348 */ 1349 perchar = cumtime / n; 1350 1351 (void) printf("%d moves (%ld chars) in %d msec, %f msec each:\n", 1352 n, xmits, (int) cumtime, perchar); 1353 1354 for (i = 0; speeds[i]; i++) { 1355 /* 1356 * Total estimated time for the moves, computation and 1357 * transmission both. Transmission time is an estimate 1358 * assuming 9 bits/char, 8 bits + 1 stop bit. 1359 */ 1360 float totalest = cumtime + xmits * 9 * 1e6 / speeds[i]; 1361 1362 /* 1363 * Per-character optimization overhead in character transmits 1364 * at the current speed. Round this to the nearest integer 1365 * to figure COMPUTE_OVERHEAD for the speed. 1366 */ 1367 float overhead = speeds[i] * perchar / 1e6; 1368 1369 (void) 1370 printf("%6d bps: %3.2f char-xmits overhead; total estimated time %15.2f\n", 1371 speeds[i], overhead, totalest); 1372 } 1373 } else if (buf[0] == 'c') { 1374 (void) printf("char padding: %d\n", CURRENT_SCREEN->_char_padding); 1375 (void) printf("cr cost: %d\n", CURRENT_SCREEN->_cr_cost); 1376 (void) printf("cup cost: %d\n", CURRENT_SCREEN->_cup_cost); 1377 (void) printf("home cost: %d\n", CURRENT_SCREEN->_home_cost); 1378 (void) printf("ll cost: %d\n", CURRENT_SCREEN->_ll_cost); 1379#if USE_HARD_TABS 1380 (void) printf("ht cost: %d\n", CURRENT_SCREEN->_ht_cost); 1381 (void) printf("cbt cost: %d\n", CURRENT_SCREEN->_cbt_cost); 1382#endif /* USE_HARD_TABS */ 1383 (void) printf("cub1 cost: %d\n", CURRENT_SCREEN->_cub1_cost); 1384 (void) printf("cuf1 cost: %d\n", CURRENT_SCREEN->_cuf1_cost); 1385 (void) printf("cud1 cost: %d\n", CURRENT_SCREEN->_cud1_cost); 1386 (void) printf("cuu1 cost: %d\n", CURRENT_SCREEN->_cuu1_cost); 1387 (void) printf("cub cost: %d\n", CURRENT_SCREEN->_cub_cost); 1388 (void) printf("cuf cost: %d\n", CURRENT_SCREEN->_cuf_cost); 1389 (void) printf("cud cost: %d\n", CURRENT_SCREEN->_cud_cost); 1390 (void) printf("cuu cost: %d\n", CURRENT_SCREEN->_cuu_cost); 1391 (void) printf("hpa cost: %d\n", CURRENT_SCREEN->_hpa_cost); 1392 (void) printf("vpa cost: %d\n", CURRENT_SCREEN->_vpa_cost); 1393 } else if (buf[0] == 'x' || buf[0] == 'q') 1394 break; 1395 else 1396 (void) puts("Invalid command."); 1397 } 1398 1399 (void) fputs("rmcup:", stdout); 1400 _nc_mvcur_wrap(); 1401 putchar('\n'); 1402 1403 return (0); 1404} 1405 1406#endif /* MAIN */ 1407 1408/* lib_mvcur.c ends here */ 1409