1 /****************************************************************************
2 * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc. *
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5 * copy of this software and associated documentation files (the *
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9 * copies of the Software, and to permit persons to whom the Software is *
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12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
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. *
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 *
27 ****************************************************************************/
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 ****************************************************************************/
39 ** The routines for moving the physical cursor and scrolling:
41 ** void _nc_mvcur_init(void)
43 ** void _nc_mvcur_resume(void)
45 ** int mvcur(int old_y, int old_x, int new_y, int new_x)
47 ** void _nc_mvcur_wrap(void)
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!).
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.
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.
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
77 /****************************************************************************
79 * Constants and macros for optimizer tuning.
81 ****************************************************************************/
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.
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
96 #define COMPUTE_OVERHEAD 1 /* I use a 90MHz Pentium @ 9.6Kbps */
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.
104 #define LONG_DIST (8 - COMPUTE_OVERHEAD)
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.
113 #define NOT_LOCAL(fy, fx, ty, tx) ((tx > LONG_DIST) \
114 && (tx < screen_columns(CURRENT_SCREEN) - 1 - LONG_DIST) \
115 && (abs(ty-fy) + abs(tx-fx) > LONG_DIST))
117 /****************************************************************************
119 * External interfaces
121 ****************************************************************************/
124 * For this code to work OK, the following components must live in the
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)
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)
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.
155 #include <curses.priv.h>
159 MODULE_ID("$Id: lib_mvcur.c,v 1.115 2009/04/18 19:03:05 tom Exp $")
161 #define WANT_CHAR(y, x) SP->_newscr->_line[y].text[x] /* desired state */
162 #define BAUDRATE cur_term->_baudrate /* bits per second */
164 #if defined(MAIN) || defined(NCURSES_TEST)
165 #include <sys/time.h>
167 static bool profiling = FALSE;
173 static int normalized_cost(const char *const cap, int affcnt);
175 /****************************************************************************
177 * Initialization/wrapup (including cost pre-computation)
179 ****************************************************************************/
183 trace_cost_of(const char *capname, const char *cap, int affcnt)
185 int result = _nc_msec_cost(cap, affcnt);
186 TR(TRACE_CHARPUT | TRACE_MOVE,
187 ("CostOf %s %d %s", capname, result, _nc_visbuf(cap)));
190 #define CostOf(cap,affcnt) trace_cost_of(#cap,cap,affcnt);
193 trace_normalized_cost(const char *capname, const char *cap, int affcnt)
195 int result = normalized_cost(cap, affcnt);
196 TR(TRACE_CHARPUT | TRACE_MOVE,
197 ("NormalizedCost %s %d %s", capname, result, _nc_visbuf(cap)));
200 #define NormalizedCost(cap,affcnt) trace_normalized_cost(#cap,cap,affcnt);
204 #define CostOf(cap,affcnt) _nc_msec_cost(cap,affcnt);
205 #define NormalizedCost(cap,affcnt) normalized_cost(cap,affcnt);
210 _nc_msec_cost(const char *const cap, int affcnt)
211 /* compute the cost of a given operation */
217 float cum_cost = 0.0;
219 for (cp = cap; *cp; cp++) {
220 /* extract padding, either mandatory or required */
221 if (cp[0] == '$' && cp[1] == '<' && strchr(cp, '>')) {
224 for (cp += 2; *cp != '>'; cp++) {
225 if (isdigit(UChar(*cp)))
226 number = number * 10 + (*cp - '0');
229 else if (*cp == '.' && (*++cp != '>') && isdigit(UChar(*cp)))
230 number += (*cp - '0') / 10.0;
233 #if NCURSES_NO_PADDING
234 if (!GetNoPadding(SP))
236 cum_cost += number * 10;
238 cum_cost += SP->_char_padding;
241 return ((int) cum_cost);
246 normalized_cost(const char *const cap, int affcnt)
247 /* compute the effective character-count for an operation (round up) */
249 int cost = _nc_msec_cost(cap, affcnt);
250 if (cost != INFINITY)
251 cost = (cost + SP->_char_padding - 1) / SP->_char_padding;
256 reset_scroll_region(void)
257 /* Set the scroll-region to a known state (the default) */
259 if (change_scroll_region) {
260 TPUTS_TRACE("change_scroll_region");
261 putp(TPARM_2(change_scroll_region, 0, screen_lines(CURRENT_SCREEN) - 1));
266 _nc_mvcur_resume(void)
267 /* what to do at initialization time and after each shellout */
269 /* initialize screen for cursor access */
271 TPUTS_TRACE("enter_ca_mode");
276 * Doing this here rather than in _nc_mvcur_wrap() ensures that
277 * ncurses programs will see a reset scroll region even if a
278 * program that messed with it died ungracefully.
280 * This also undoes the effects of terminal init strings that assume
281 * they know the screen size. This is useful when you're running
282 * a vt100 emulation through xterm.
284 reset_scroll_region();
285 SP->_cursrow = SP->_curscol = -1;
287 /* restore cursor shape */
288 if (SP->_cursor != -1) {
289 int cursor = SP->_cursor;
297 /* initialize the cost structure */
299 if (isatty(fileno(SP->_ofp)))
300 SP->_char_padding = ((BAUDBYTE * 1000 * 10)
301 / (BAUDRATE > 0 ? BAUDRATE : 9600));
303 SP->_char_padding = 1; /* must be nonzero */
304 if (SP->_char_padding <= 0)
305 SP->_char_padding = 1; /* must be nonzero */
306 TR(TRACE_CHARPUT | TRACE_MOVE, ("char_padding %d msecs", SP->_char_padding));
308 /* non-parameterized local-motion strings */
309 SP->_cr_cost = CostOf(carriage_return, 0);
310 SP->_home_cost = CostOf(cursor_home, 0);
311 SP->_ll_cost = CostOf(cursor_to_ll, 0);
313 if (getenv("NCURSES_NO_HARD_TABS") == 0) {
314 SP->_ht_cost = CostOf(tab, 0);
315 SP->_cbt_cost = CostOf(back_tab, 0);
317 SP->_ht_cost = INFINITY;
318 SP->_cbt_cost = INFINITY;
320 #endif /* USE_HARD_TABS */
321 SP->_cub1_cost = CostOf(cursor_left, 0);
322 SP->_cuf1_cost = CostOf(cursor_right, 0);
323 SP->_cud1_cost = CostOf(cursor_down, 0);
324 SP->_cuu1_cost = CostOf(cursor_up, 0);
326 SP->_smir_cost = CostOf(enter_insert_mode, 0);
327 SP->_rmir_cost = CostOf(exit_insert_mode, 0);
329 if (insert_padding) {
330 SP->_ip_cost = CostOf(insert_padding, 0);
334 * Assumption: if the terminal has memory_relative addressing, the
335 * initialization strings or smcup will set single-page mode so we
336 * can treat it like absolute screen addressing. This seems to be true
337 * for all cursor_mem_address terminal types in the terminfo database.
339 SP->_address_cursor = cursor_address ? cursor_address : cursor_mem_address;
342 * Parametrized local-motion strings. This static cost computation
343 * depends on the following assumptions:
345 * (1) They never have * padding. In the entire master terminfo database
346 * as of March 1995, only the obsolete Zenith Z-100 pc violates this.
347 * (Proportional padding is found mainly in insert, delete and scroll
350 * (2) The average case of cup has two two-digit parameters. Strictly,
351 * the average case for a 24 * 80 screen has ((10*10*(1 + 1)) +
352 * (14*10*(1 + 2)) + (10*70*(2 + 1)) + (14*70*4)) / (24*80) = 3.458
353 * digits of parameters. On a 25x80 screen the average is 3.6197.
354 * On larger screens the value gets much closer to 4.
356 * (3) The average case of cub/cuf/hpa/ech/rep has 2 digits of parameters
357 * (strictly, (((10 * 1) + (70 * 2)) / 80) = 1.8750).
359 * (4) The average case of cud/cuu/vpa has 2 digits of parameters
360 * (strictly, (((10 * 1) + (14 * 2)) / 24) = 1.5833).
362 * All these averages depend on the assumption that all parameter values
363 * are equally probable.
365 SP->_cup_cost = CostOf(TPARM_2(SP->_address_cursor, 23, 23), 1);
366 SP->_cub_cost = CostOf(TPARM_1(parm_left_cursor, 23), 1);
367 SP->_cuf_cost = CostOf(TPARM_1(parm_right_cursor, 23), 1);
368 SP->_cud_cost = CostOf(TPARM_1(parm_down_cursor, 23), 1);
369 SP->_cuu_cost = CostOf(TPARM_1(parm_up_cursor, 23), 1);
370 SP->_hpa_cost = CostOf(TPARM_1(column_address, 23), 1);
371 SP->_vpa_cost = CostOf(TPARM_1(row_address, 23), 1);
373 /* non-parameterized screen-update strings */
374 SP->_ed_cost = NormalizedCost(clr_eos, 1);
375 SP->_el_cost = NormalizedCost(clr_eol, 1);
376 SP->_el1_cost = NormalizedCost(clr_bol, 1);
377 SP->_dch1_cost = NormalizedCost(delete_character, 1);
378 SP->_ich1_cost = NormalizedCost(insert_character, 1);
381 * If this is a bce-terminal, we want to bias the choice so we use clr_eol
382 * rather than spaces at the end of a line.
384 if (back_color_erase)
387 /* parameterized screen-update strings */
388 SP->_dch_cost = NormalizedCost(TPARM_1(parm_dch, 23), 1);
389 SP->_ich_cost = NormalizedCost(TPARM_1(parm_ich, 23), 1);
390 SP->_ech_cost = NormalizedCost(TPARM_1(erase_chars, 23), 1);
391 SP->_rep_cost = NormalizedCost(TPARM_2(repeat_char, ' ', 23), 1);
393 SP->_cup_ch_cost = NormalizedCost(TPARM_2(SP->_address_cursor, 23, 23), 1);
394 SP->_hpa_ch_cost = NormalizedCost(TPARM_1(column_address, 23), 1);
395 SP->_cuf_ch_cost = NormalizedCost(TPARM_1(parm_right_cursor, 23), 1);
396 SP->_inline_cost = min(SP->_cup_ch_cost,
397 min(SP->_hpa_ch_cost,
401 * If save_cursor is used within enter_ca_mode, we should not use it for
402 * scrolling optimization, since the corresponding restore_cursor is not
403 * nested on the various terminals (vt100, xterm, etc.) which use this
407 && enter_ca_mode != 0
408 && strstr(enter_ca_mode, save_cursor) != 0) {
409 T(("...suppressed sc/rc capability due to conflict with smcup/rmcup"));
415 * A different, possibly better way to arrange this would be to set
416 * SP->_endwin = TRUE at window initialization time and let this be
417 * called by doupdate's return-from-shellout code.
424 /* wrap up cursor-addressing mode */
426 /* leave cursor at screen bottom */
427 mvcur(-1, -1, screen_lines(CURRENT_SCREEN) - 1, 0);
429 /* set cursor to normal mode */
430 if (SP->_cursor != -1) {
431 int cursor = SP->_cursor;
433 SP->_cursor = cursor;
437 TPUTS_TRACE("exit_ca_mode");
441 * Reset terminal's tab counter. There's a long-time bug that
442 * if you exit a "curses" program such as vi or more, tab
443 * forward, and then backspace, the cursor doesn't go to the
444 * right place. The problem is that the kernel counts the
445 * escape sequences that reset things as column positions.
446 * Utter a \r to reset this invisibly.
451 /****************************************************************************
453 * Optimized cursor movement
455 ****************************************************************************/
458 * Perform repeated-append, returning cost
460 static NCURSES_INLINE int
461 repeated_append(string_desc * target, int total, int num, int repeat, const char *src)
463 size_t need = repeat * strlen(src);
465 if (need < target->s_size) {
466 while (repeat-- > 0) {
467 if (_nc_safe_strcat(target, src)) {
481 #define NEXTTAB(fr) (fr + init_tabs - (fr % init_tabs))
484 * Assume back_tab (CBT) does not wrap backwards at the left margin, return
485 * a negative value at that point to simplify the loop.
487 #define LASTTAB(fr) ((fr > 0) ? ((fr - 1) / init_tabs) * init_tabs : -1)
490 relative_move(string_desc * target, int from_y, int from_x, int to_y, int
492 /* move via local motions (cuu/cuu1/cud/cud1/cub1/cub/cuf1/cuf/vpa/hpa) */
495 int n, vcost = 0, hcost = 0;
497 (void) _nc_str_copy(&save, target);
499 if (to_y != from_y) {
503 && _nc_safe_strcat(target, TPARM_1(row_address, to_y))) {
504 vcost = SP->_vpa_cost;
511 && SP->_cud_cost < vcost
512 && _nc_safe_strcat(_nc_str_copy(target, &save),
513 TPARM_1(parm_down_cursor, n))) {
514 vcost = SP->_cud_cost;
518 && (*cursor_down != '\n' || SP->_nl)
519 && (n * SP->_cud1_cost < vcost)) {
520 vcost = repeated_append(_nc_str_copy(target, &save), 0,
521 SP->_cud1_cost, n, cursor_down);
523 } else { /* (to_y < from_y) */
527 && SP->_cuu_cost < vcost
528 && _nc_safe_strcat(_nc_str_copy(target, &save),
529 TPARM_1(parm_up_cursor, n))) {
530 vcost = SP->_cuu_cost;
533 if (cursor_up && (n * SP->_cuu1_cost < vcost)) {
534 vcost = repeated_append(_nc_str_copy(target, &save), 0,
535 SP->_cuu1_cost, n, cursor_up);
539 if (vcost == INFINITY)
545 if (to_x != from_x) {
552 && _nc_safe_strcat(_nc_str_copy(target, &save),
553 TPARM_1(column_address, to_x))) {
554 hcost = SP->_hpa_cost;
560 if (parm_right_cursor
561 && SP->_cuf_cost < hcost
562 && _nc_safe_strcat(_nc_str_copy(target, &save),
563 TPARM_1(parm_right_cursor, n))) {
564 hcost = SP->_cuf_cost;
570 (void) _nc_str_init(&check, str, sizeof(str));
573 /* use hard tabs, if we have them, to do as much as possible */
574 if (init_tabs > 0 && tab) {
577 for (fr = from_x; (nxt = NEXTTAB(fr)) <= to_x; fr = nxt) {
578 lhcost = repeated_append(&check, lhcost,
579 SP->_ht_cost, 1, tab);
580 if (lhcost == INFINITY)
587 #endif /* USE_HARD_TABS */
589 if (n <= 0 || n >= (int) check.s_size)
593 * If we're allowing BSD-style padding in tputs, don't generate
594 * a string with a leading digit. Otherwise, that will be
595 * interpreted as a padding value rather than sent to the
600 && n < (int) check.s_size
603 int wanted = CharOf(WANT_CHAR(to_y, from_x));
604 if (is8bits(wanted) && isdigit(wanted))
609 * If we have no attribute changes, overwrite is cheaper.
610 * Note: must suppress this by passing in ovw = FALSE whenever
611 * WANT_CHAR would return invalid data. In particular, this
612 * is true between the time a hardware scroll has been done
613 * and the time the structure WANT_CHAR would access has been
619 for (i = 0; i < n; i++) {
620 NCURSES_CH_T ch = WANT_CHAR(to_y, from_x + i);
621 if (!SameAttrOf(ch, SCREEN_ATTRS(SP))
622 #if USE_WIDEC_SUPPORT
634 for (i = 0; i < n; i++)
635 *check.s_tail++ = (char) CharOf(WANT_CHAR(to_y,
637 *check.s_tail = '\0';
639 lhcost += n * SP->_char_padding;
641 lhcost = repeated_append(&check, lhcost, SP->_cuf1_cost,
646 && _nc_safe_strcat(_nc_str_copy(target, &save), str)) {
650 } else { /* (to_x < from_x) */
654 && SP->_cub_cost < hcost
655 && _nc_safe_strcat(_nc_str_copy(target, &save),
656 TPARM_1(parm_left_cursor, n))) {
657 hcost = SP->_cub_cost;
663 (void) _nc_str_init(&check, str, sizeof(str));
666 if (init_tabs > 0 && back_tab) {
669 for (fr = from_x; (nxt = LASTTAB(fr)) >= to_x; fr = nxt) {
670 lhcost = repeated_append(&check, lhcost,
671 SP->_cbt_cost, 1, back_tab);
672 if (lhcost == INFINITY)
678 #endif /* USE_HARD_TABS */
680 lhcost = repeated_append(&check, lhcost, SP->_cub1_cost, n, cursor_left);
683 && _nc_safe_strcat(_nc_str_copy(target, &save), str)) {
689 if (hcost == INFINITY)
693 return (vcost + hcost);
695 #endif /* !NO_OPTIMIZE */
698 * With the machinery set up above, it's conceivable that
699 * onscreen_mvcur could be modified into a recursive function that does
700 * an alpha-beta search of motion space, as though it were a chess
701 * move tree, with the weight function being boolean and the search
702 * depth equated to length of string. However, this would jack up the
703 * computation cost a lot, especially on terminals without a cup
704 * capability constraining the search tree depth. So we settle for
705 * the simpler method below.
708 static NCURSES_INLINE int
709 onscreen_mvcur(int yold, int xold, int ynew, int xnew, bool ovw)
710 /* onscreen move from (yold, xold) to (ynew, xnew) */
713 char buffer[OPT_SIZE];
714 int tactic = 0, newcost, usecost = INFINITY;
717 #if defined(MAIN) || defined(NCURSES_TEST)
718 struct timeval before, after;
720 gettimeofday(&before, NULL);
723 #define NullResult _nc_str_null(&result, sizeof(buffer))
724 #define InitResult _nc_str_init(&result, buffer, sizeof(buffer))
726 /* tactic #0: use direct cursor addressing */
727 if (_nc_safe_strcpy(InitResult, TPARM_2(SP->_address_cursor, ynew, xnew))) {
729 usecost = SP->_cup_cost;
731 #if defined(TRACE) || defined(NCURSES_TEST)
732 if (!(_nc_optimize_enable & OPTIMIZE_MVCUR))
737 * We may be able to tell in advance that the full optimization
738 * will probably not be worth its overhead. Also, don't try to
739 * use local movement if the current attribute is anything but
740 * A_NORMAL...there are just too many ways this can screw up
741 * (like, say, local-movement \n getting mapped to some obscure
742 * character because A_ALTCHARSET is on).
744 if (yold == -1 || xold == -1 || NOT_LOCAL(yold, xold, ynew, xnew)) {
745 #if defined(MAIN) || defined(NCURSES_TEST)
747 (void) fputs("nonlocal\n", stderr);
748 goto nonlocal; /* always run the optimizer if profiling */
756 /* tactic #1: use local movement */
757 if (yold != -1 && xold != -1
758 && ((newcost = relative_move(NullResult, yold, xold, ynew, xnew,
760 && newcost < usecost) {
765 /* tactic #2: use carriage-return + local movement */
766 if (yold != -1 && carriage_return
767 && ((newcost = relative_move(NullResult, yold, 0, ynew, xnew, ovw))
769 && SP->_cr_cost + newcost < usecost) {
771 usecost = SP->_cr_cost + newcost;
774 /* tactic #3: use home-cursor + local movement */
776 && ((newcost = relative_move(NullResult, 0, 0, ynew, xnew, ovw)) != INFINITY)
777 && SP->_home_cost + newcost < usecost) {
779 usecost = SP->_home_cost + newcost;
782 /* tactic #4: use home-down + local movement */
784 && ((newcost = relative_move(NullResult,
785 screen_lines(CURRENT_SCREEN) - 1, 0, ynew,
786 xnew, ovw)) != INFINITY)
787 && SP->_ll_cost + newcost < usecost) {
789 usecost = SP->_ll_cost + newcost;
793 * tactic #5: use left margin for wrap to right-hand side,
794 * unless strange wrap behavior indicated by xenl might hose us.
796 t5_cr_cost = (xold > 0 ? SP->_cr_cost : 0);
797 if (auto_left_margin && !eat_newline_glitch
798 && yold > 0 && cursor_left
799 && ((newcost = relative_move(NullResult,
801 screen_columns(CURRENT_SCREEN) - 1,
805 && t5_cr_cost + SP->_cub1_cost + newcost < usecost) {
807 usecost = t5_cr_cost + SP->_cub1_cost + newcost;
811 * These cases are ordered by estimated relative frequency.
817 (void) relative_move(&result, yold, xold, ynew, xnew, ovw);
820 (void) _nc_safe_strcpy(&result, carriage_return);
821 (void) relative_move(&result, yold, 0, ynew, xnew, ovw);
824 (void) _nc_safe_strcpy(&result, cursor_home);
825 (void) relative_move(&result, 0, 0, ynew, xnew, ovw);
828 (void) _nc_safe_strcpy(&result, cursor_to_ll);
829 (void) relative_move(&result,
830 screen_lines(CURRENT_SCREEN) - 1,
838 (void) _nc_safe_strcat(&result, carriage_return);
839 (void) _nc_safe_strcat(&result, cursor_left);
840 (void) relative_move(&result,
842 screen_columns(CURRENT_SCREEN) - 1,
848 #endif /* !NO_OPTIMIZE */
851 #if defined(MAIN) || defined(NCURSES_TEST)
852 gettimeofday(&after, NULL);
853 diff = after.tv_usec - before.tv_usec
854 + (after.tv_sec - before.tv_sec) * 1000000;
856 (void) fprintf(stderr,
857 "onscreen: %d microsec, %f 28.8Kbps char-equivalents\n",
858 (int) diff, diff / 288);
861 if (usecost != INFINITY) {
862 TPUTS_TRACE("mvcur");
863 tputs(buffer, 1, _nc_outch);
871 /* optimized cursor move from (yold, xold) to (ynew, xnew) */
873 NCURSES_SP_NAME(mvcur) (NCURSES_SP_DCLx
874 int yold, int xold, int ynew, int xnew)
876 NCURSES_CH_T oldattr;
879 TR(TRACE_CALLS | TRACE_MOVE, (T_CALLED("mvcur(%d,%d,%d,%d)"),
880 yold, xold, ynew, xnew));
884 } else if (yold == ynew && xold == xnew) {
889 * Most work here is rounding for terminal boundaries getting the
890 * column position implied by wraparound or the lack thereof and
891 * rolling up the screen to get ynew on the screen.
893 if (xnew >= screen_columns(CURRENT_SCREEN)) {
894 ynew += xnew / screen_columns(CURRENT_SCREEN);
895 xnew %= screen_columns(CURRENT_SCREEN);
899 * Force restore even if msgr is on when we're in an alternate
900 * character set -- these have a strong tendency to screw up the CR &
901 * LF used for local character motions!
903 oldattr = SCREEN_ATTRS(SP_PARM);
904 if ((AttrOf(oldattr) & A_ALTCHARSET)
905 || (AttrOf(oldattr) && !move_standout_mode)) {
906 TR(TRACE_CHARPUT, ("turning off (%#lx) %s before move",
907 (unsigned long) AttrOf(oldattr),
908 _traceattr(AttrOf(oldattr))));
909 (void) VIDATTR(A_NORMAL, 0);
912 if (xold >= screen_columns(CURRENT_SCREEN)) {
916 l = (xold + 1) / screen_columns(CURRENT_SCREEN);
918 if (yold >= screen_lines(CURRENT_SCREEN))
919 l -= (yold - screen_lines(CURRENT_SCREEN) - 1);
922 if (carriage_return) {
923 TPUTS_TRACE("carriage_return");
924 putp(carriage_return);
931 TPUTS_TRACE("newline");
940 * If caller set nonl(), we cannot really use newlines to
941 * position to the next row.
948 if (yold > screen_lines(CURRENT_SCREEN) - 1)
949 yold = screen_lines(CURRENT_SCREEN) - 1;
950 if (ynew > screen_lines(CURRENT_SCREEN) - 1)
951 ynew = screen_lines(CURRENT_SCREEN) - 1;
953 /* destination location is on screen now */
954 code = onscreen_mvcur(yold, xold, ynew, xnew, TRUE);
957 * Restore attributes if we disabled them before moving.
959 if (!SameAttrOf(oldattr, SCREEN_ATTRS(SP_PARM))) {
960 TR(TRACE_CHARPUT, ("turning on (%#lx) %s after move",
961 (unsigned long) AttrOf(oldattr),
962 _traceattr(AttrOf(oldattr))));
963 (void) VIDATTR(AttrOf(oldattr), GetPair(oldattr));
971 mvcur(int yold, int xold, int ynew, int xnew)
973 return NCURSES_SP_NAME(mvcur) (CURRENT_SCREEN, yold, xold, ynew, xnew);
977 #if defined(TRACE) || defined(NCURSES_TEST)
978 NCURSES_EXPORT_VAR(int) _nc_optimize_enable = OPTIMIZE_ALL;
981 #if defined(MAIN) || defined(NCURSES_TEST)
982 /****************************************************************************
984 * Movement optimizer test code
986 ****************************************************************************/
989 #include <dump_entry.h>
992 NCURSES_EXPORT_VAR(const char *) _nc_progname = "mvcur";
994 static unsigned long xmits;
996 /* these override lib_tputs.c */
998 tputs(const char *string, int affcnt GCC_UNUSED, int (*outc) (int) GCC_UNUSED)
999 /* stub tputs() that dumps sequences in a visible form */
1002 xmits += strlen(string);
1004 (void) fputs(_nc_visbuf(string), stdout);
1009 putp(const char *string)
1011 return (tputs(string, 1, _nc_outch));
1022 delay_output(int ms GCC_UNUSED)
1027 static char tname[PATH_MAX];
1032 (void) setupterm(tname, STDOUT_FILENO, NULL);
1040 i = (RAND_MAX / n) * n;
1041 while ((j = rand()) >= i)
1047 main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
1049 strcpy(tname, getenv("TERM"));
1051 _nc_setupscreen(lines, columns, stdout, FALSE, 0);
1057 (void) puts("The mvcur tester. Type ? for help");
1059 fputs("smcup:", stdout);
1063 int fy, fx, ty, tx, n, i;
1064 char buf[BUFSIZ], capname[BUFSIZ];
1066 (void) fputs("> ", stdout);
1067 (void) fgets(buf, sizeof(buf), stdin);
1069 if (buf[0] == '?') {
1070 (void) puts("? -- display this help message");
1072 puts("fy fx ty tx -- (4 numbers) display (fy,fx)->(ty,tx) move");
1073 (void) puts("s[croll] n t b m -- display scrolling sequence");
1075 printf("r[eload] -- reload terminal info for %s\n",
1078 puts("l[oad] <term> -- load terminal info for type <term>");
1079 (void) puts("d[elete] <cap> -- delete named capability");
1080 (void) puts("i[nspect] -- display terminal capabilities");
1082 puts("c[ost] -- dump cursor-optimization cost table");
1083 (void) puts("o[optimize] -- toggle movement optimization");
1085 puts("t[orture] <num> -- torture-test with <num> random moves");
1086 (void) puts("q[uit] -- quit the program");
1087 } else if (sscanf(buf, "%d %d %d %d", &fy, &fx, &ty, &tx) == 4) {
1088 struct timeval before, after;
1092 gettimeofday(&before, NULL);
1093 mvcur(fy, fx, ty, tx);
1094 gettimeofday(&after, NULL);
1096 printf("\" (%ld msec)\n",
1097 (long) (after.tv_usec - before.tv_usec
1098 + (after.tv_sec - before.tv_sec)
1100 } else if (sscanf(buf, "s %d %d %d %d", &fy, &fx, &ty, &tx) == 4) {
1101 struct timeval before, after;
1105 gettimeofday(&before, NULL);
1106 _nc_scrolln(fy, fx, ty, tx);
1107 gettimeofday(&after, NULL);
1109 printf("\" (%ld msec)\n",
1110 (long) (after.tv_usec - before.tv_usec + (after.tv_sec -
1113 } else if (buf[0] == 'r') {
1114 (void) strcpy(tname, termname());
1116 } else if (sscanf(buf, "l %s", tname) == 1) {
1118 } else if (sscanf(buf, "d %s", capname) == 1) {
1119 struct name_table_entry const *np = _nc_find_entry(capname,
1120 _nc_get_hash_table(FALSE));
1123 (void) printf("No such capability as \"%s\"\n", capname);
1125 switch (np->nte_type) {
1127 cur_term->type.Booleans[np->nte_index] = FALSE;
1129 printf("Boolean capability `%s' (%d) turned off.\n",
1130 np->nte_name, np->nte_index);
1134 cur_term->type.Numbers[np->nte_index] = ABSENT_NUMERIC;
1135 (void) printf("Number capability `%s' (%d) set to -1.\n",
1136 np->nte_name, np->nte_index);
1140 cur_term->type.Strings[np->nte_index] = ABSENT_STRING;
1141 (void) printf("String capability `%s' (%d) deleted.\n",
1142 np->nte_name, np->nte_index);
1146 } else if (buf[0] == 'i') {
1147 dump_init((char *) NULL, F_TERMINFO, S_TERMINFO, 70, 0, FALSE);
1148 dump_entry(&cur_term->type, FALSE, TRUE, 0, 0);
1150 } else if (buf[0] == 'o') {
1151 if (_nc_optimize_enable & OPTIMIZE_MVCUR) {
1152 _nc_optimize_enable &= ~OPTIMIZE_MVCUR;
1153 (void) puts("Optimization is now off.");
1155 _nc_optimize_enable |= OPTIMIZE_MVCUR;
1156 (void) puts("Optimization is now on.");
1160 * You can use the `t' test to profile and tune the movement
1161 * optimizer. Use iteration values in three digits or more.
1162 * At above 5000 iterations the profile timing averages are stable
1163 * to within a millisecond or three.
1165 * The `overhead' field of the report will help you pick a
1166 * COMPUTE_OVERHEAD figure appropriate for your processor and
1167 * expected line speed. The `total estimated time' is
1168 * computation time plus a character-transmission time
1169 * estimate computed from the number of transmits and the baud
1172 * Use this together with the `o' command to get a read on the
1173 * optimizer's effectiveness. Compare the total estimated times
1174 * for `t' runs of the same length in both optimized and un-optimized
1175 * modes. As long as the optimized times are less, the optimizer
1178 else if (sscanf(buf, "t %d", &n) == 1) {
1179 float cumtime = 0.0, perchar;
1181 {2400, 9600, 14400, 19200, 28800, 38400, 0};
1183 srand((unsigned) (getpid() + time((time_t *) 0)));
1186 for (i = 0; i < n; i++) {
1188 * This does a move test between two random locations,
1189 * Random moves probably short-change the optimizer,
1190 * which will work better on the short moves probably
1191 * typical of doupdate()'s usage pattern. Still,
1192 * until we have better data...
1194 #ifdef FIND_COREDUMP
1195 int from_y = roll(lines);
1196 int to_y = roll(lines);
1197 int from_x = roll(columns);
1198 int to_x = roll(columns);
1200 printf("(%d,%d) -> (%d,%d)\n", from_y, from_x, to_y, to_x);
1201 mvcur(from_y, from_x, to_y, to_x);
1203 mvcur(roll(lines), roll(columns), roll(lines), roll(columns));
1204 #endif /* FIND_COREDUMP */
1211 * Average milliseconds per character optimization time.
1212 * This is the key figure to watch when tuning the optimizer.
1214 perchar = cumtime / n;
1216 (void) printf("%d moves (%ld chars) in %d msec, %f msec each:\n",
1217 n, xmits, (int) cumtime, perchar);
1219 for (i = 0; speeds[i]; i++) {
1221 * Total estimated time for the moves, computation and
1222 * transmission both. Transmission time is an estimate
1223 * assuming 9 bits/char, 8 bits + 1 stop bit.
1225 float totalest = cumtime + xmits * 9 * 1e6 / speeds[i];
1228 * Per-character optimization overhead in character transmits
1229 * at the current speed. Round this to the nearest integer
1230 * to figure COMPUTE_OVERHEAD for the speed.
1232 float overhead = speeds[i] * perchar / 1e6;
1235 printf("%6d bps: %3.2f char-xmits overhead; total estimated time %15.2f\n",
1236 speeds[i], overhead, totalest);
1238 } else if (buf[0] == 'c') {
1239 (void) printf("char padding: %d\n", SP->_char_padding);
1240 (void) printf("cr cost: %d\n", SP->_cr_cost);
1241 (void) printf("cup cost: %d\n", SP->_cup_cost);
1242 (void) printf("home cost: %d\n", SP->_home_cost);
1243 (void) printf("ll cost: %d\n", SP->_ll_cost);
1245 (void) printf("ht cost: %d\n", SP->_ht_cost);
1246 (void) printf("cbt cost: %d\n", SP->_cbt_cost);
1247 #endif /* USE_HARD_TABS */
1248 (void) printf("cub1 cost: %d\n", SP->_cub1_cost);
1249 (void) printf("cuf1 cost: %d\n", SP->_cuf1_cost);
1250 (void) printf("cud1 cost: %d\n", SP->_cud1_cost);
1251 (void) printf("cuu1 cost: %d\n", SP->_cuu1_cost);
1252 (void) printf("cub cost: %d\n", SP->_cub_cost);
1253 (void) printf("cuf cost: %d\n", SP->_cuf_cost);
1254 (void) printf("cud cost: %d\n", SP->_cud_cost);
1255 (void) printf("cuu cost: %d\n", SP->_cuu_cost);
1256 (void) printf("hpa cost: %d\n", SP->_hpa_cost);
1257 (void) printf("vpa cost: %d\n", SP->_vpa_cost);
1258 } else if (buf[0] == 'x' || buf[0] == 'q')
1261 (void) puts("Invalid command.");
1264 (void) fputs("rmcup:", stdout);
1273 /* lib_mvcur.c ends here */