+++ /dev/null
-/* $NetBSD: wwupdate.c,v 1.4 1997/11/21 08:37:59 lukem Exp $ */
-
-/*
- * Copyright (c) 1983, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Edward Wang at The University of California, Berkeley.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-#ifndef lint
-#if 0
-static char sccsid[] = "@(#)wwupdate.c 8.1 (Berkeley) 6/6/93";
-#else
-__RCSID("$NetBSD: wwupdate.c,v 1.4 1997/11/21 08:37:59 lukem Exp $");
-#endif
-#endif /* not lint */
-
-#include "ww.h"
-#include "tt.h"
-#include "xx.h"
-
-void
-wwupdate1(top, bot)
- int top, bot;
-{
- int i;
- int j;
- char *touched;
- struct ww_update *upd;
- char check_clreos = 0;
- int scan_top, scan_bot;
-
- wwnupdate++;
- {
- char *t1 = wwtouched + top, *t2 = wwtouched + bot;
- int n;
-
- while (!*t1++)
- if (t1 == t2)
- return;
- while (!*--t2)
- ;
- scan_top = top = t1 - wwtouched - 1;
- scan_bot = bot = t2 - wwtouched + 1;
- if (scan_bot - scan_top > 1 &&
- (tt.tt_clreos != 0 || tt.tt_clear != 0)) {
- int st = tt.tt_clreos != 0 ? scan_top : 0;
-
- /*
- * t1 is one past the first touched row,
- * t2 is on the last touched row.
- */
- for (t1--, n = 1; t1 < t2;)
- if (*t1++)
- n++;
- /*
- * If we can't clreos then we try for clearing
- * the whole screen.
- */
- if ((check_clreos = n * 10 > (wwnrow - st) * 9)) {
- scan_top = st;
- scan_bot = wwnrow;
- }
- }
- }
- if (tt.tt_clreol == 0 && !check_clreos)
- goto simple;
- for (i = scan_top, touched = &wwtouched[i], upd = &wwupd[i];
- i < scan_bot;
- i++, touched++, upd++) {
- int gain = 0;
- int best_gain = 0;
- int best_col = 0;
- union ww_char *ns, *os;
-
- if (wwinterrupt())
- return;
- if (!check_clreos && !*touched)
- continue;
- wwnupdscan++;
- j = wwncol;
- ns = &wwns[i][j];
- os = &wwos[i][j];
- while (--j >= 0) {
- /*
- * The cost of clearing is:
- * ncol - nblank + X
- * The cost of straight update is, more or less:
- * ncol - nsame
- * We clear if nblank - nsame > X
- * X is the clreol overhead.
- * So we make gain = nblank - nsame.
- */
- if ((--ns)->c_w == (--os)->c_w)
- gain--;
- else
- best_gain--;
- if (ns->c_w == ' ')
- gain++;
- if (gain > best_gain) {
- best_col = j;
- best_gain = gain;
- }
- }
- upd->best_gain = best_gain;
- upd->best_col = best_col;
- upd->gain = gain;
- }
- if (check_clreos) {
- struct ww_update *u;
- int gain = 0;
- int best_gain = 0;
- int best_row = 0;
- int simple_gain = 0;
- char didit = 0;
-
- /*
- * gain is the advantage of clearing all the lines.
- * best_gain is the advantage of clearing to eos
- * at best_row and u->best_col.
- * simple_gain is the advantage of using only clreol.
- * We use g > best_gain because u->best_col can be
- * undefined when u->best_gain is 0 so we can't use it.
- */
- for (j = scan_bot - 1, u = wwupd + j; j >= top; j--, u--) {
- int g = gain + u->best_gain;
-
- if (g > best_gain) {
- best_gain = g;
- best_row = j;
- }
- gain += u->gain;
- if (tt.tt_clreol != 0 && u->best_gain > 4)
- simple_gain += u->best_gain - 4;
- }
- if (tt.tt_clreos == 0) {
- if (gain > simple_gain && gain > 4) {
- xxclear();
- i = top = scan_top;
- bot = scan_bot;
- j = 0;
- didit = 1;
- }
- } else
- if (best_gain > simple_gain && best_gain > 4) {
- i = best_row;
- xxclreos(i, j = wwupd[i].best_col);
- bot = scan_bot;
- didit = 1;
- }
- if (didit) {
- wwnupdclreos++;
- wwnupdclreosline += wwnrow - i;
- u = wwupd + i;
- while (i < scan_bot) {
- union ww_char *os = &wwos[i][j];
-
- for (j = wwncol - j; --j >= 0;)
- os++->c_w = ' ';
- wwtouched[i++] |= WWU_TOUCHED;
- u++->best_gain = 0;
- j = 0;
- }
- } else
- wwnupdclreosmiss++;
- }
-simple:
- for (i = top, touched = &wwtouched[i], upd = &wwupd[i]; i < bot;
- i++, touched++, upd++) {
- union ww_char *os, *ns;
- char didit;
-
- if (!*touched)
- continue;
- *touched = 0;
- wwnupdline++;
- didit = 0;
- if (tt.tt_clreol != 0 && upd->best_gain > 4) {
- wwnupdclreol++;
- xxclreol(i, j = upd->best_col);
- for (os = &wwos[i][j], j = wwncol - j; --j >= 0;)
- os++->c_w = ' ';
- didit = 1;
- }
- ns = wwns[i];
- os = wwos[i];
- for (j = 0; j < wwncol;) {
- char *p, *q;
- char m;
- int c;
- int n;
- char buf[512]; /* > wwncol */
- union ww_char lastc;
-
- for (; j++ < wwncol && ns++->c_w == os++->c_w;)
- ;
- if (j > wwncol)
- break;
- p = buf;
- m = ns[-1].c_m;
- c = j - 1;
- os[-1] = ns[-1];
- *p++ = ns[-1].c_c;
- n = 5;
- q = p;
- while (j < wwncol && ns->c_m == m) {
- *p++ = ns->c_c;
- if (ns->c_w == os->c_w) {
- if (--n <= 0)
- break;
- os++;
- ns++;
- } else {
- n = 5;
- q = p;
- lastc = *os;
- *os++ = *ns++;
- }
- j++;
- }
- n = q - buf;
- if (!wwwrap || i != wwnrow - 1 || c + n != wwncol)
- xxwrite(i, c, buf, n, m);
- else if (tt.tt_inschar || tt.tt_insspace) {
- if (n > 1) {
- q[-2] = q[-1];
- n--;
- } else
- c--;
- xxwrite(i, c, buf, n, m);
- c += n - 1;
- if (tt.tt_inschar)
- xxinschar(i, c, ns[-2].c_c,
- ns[-2].c_m);
- else {
- xxinsspace(i, c);
- xxwrite(i, c, &ns[-2].c_c, 1,
- ns[-2].c_m);
- }
- } else {
- if (--n)
- xxwrite(i, c, buf, n, m);
- os[-1] = lastc;
- *touched = WWU_TOUCHED;
- }
- didit = 1;
- }
- if (!didit)
- wwnupdmiss++;
- }
-}
projects / apple / shell_cmds.git / blobdiff