mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-13 10:02:38 +00:00
273 lines
6.8 KiB
C
273 lines
6.8 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)wwupdate.c 8.1 (Berkeley) 6/6/93";
|
|
static char rcsid[] = "@(#)$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
#include "ww.h"
|
|
#include "tt.h"
|
|
|
|
wwupdate1(top, bot)
|
|
{
|
|
int i;
|
|
register j;
|
|
char *touched;
|
|
struct ww_update *upd;
|
|
char check_clreos = 0;
|
|
int scan_top, scan_bot;
|
|
|
|
wwnupdate++;
|
|
{
|
|
register char *t1 = wwtouched + top, *t2 = wwtouched + bot;
|
|
register 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++) {
|
|
register gain = 0;
|
|
register best_gain = 0;
|
|
register best_col;
|
|
register 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) {
|
|
register struct ww_update *u;
|
|
register gain = 0;
|
|
register best_gain = 0;
|
|
int best_row;
|
|
register 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--) {
|
|
register 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) {
|
|
register 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++) {
|
|
register 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;) {
|
|
register char *p, *q;
|
|
char m;
|
|
int c;
|
|
register 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++;
|
|
}
|
|
}
|