NetBSD/usr.bin/window/wwscroll.c

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/* $NetBSD: wwscroll.c,v 1.4 1997/11/21 08:37:48 lukem Exp $ */
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/*
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* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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>
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#ifndef lint
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#if 0
static char sccsid[] = "@(#)wwscroll.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: wwscroll.c,v 1.4 1997/11/21 08:37:48 lukem Exp $");
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#endif
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#endif /* not lint */
#include "ww.h"
#include "tt.h"
#include "xx.h"
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void
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wwscroll(w, n)
struct ww *w;
int n;
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{
int dir;
int top;
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if (n == 0)
return;
dir = n < 0 ? -1 : 1;
top = w->ww_b.t - n;
if (top > w->ww_w.t)
top = w->ww_w.t;
else if (top + w->ww_b.nr < w->ww_w.b)
top = w->ww_w.b - w->ww_b.nr;
n = abs(top - w->ww_b.t);
if (n < w->ww_i.nr) {
while (--n >= 0) {
(void) wwscroll1(w, w->ww_i.t, w->ww_i.b, dir, 0);
w->ww_buf += dir;
w->ww_b.t -= dir;
w->ww_b.b -= dir;
}
} else {
w->ww_buf -= top - w->ww_b.t;
w->ww_b.t = top;
w->ww_b.b = top + w->ww_b.nr;
wwredrawwin(w);
}
}
/*
* Scroll one line, between 'row1' and 'row2', in direction 'dir'.
* Don't adjust ww_scroll.
* And don't redraw 'leaveit' lines.
*/
int
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wwscroll1(w, row1, row2, dir, leaveit)
struct ww *w;
int row1, row2, dir;
int leaveit;
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{
int i;
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int row1x, row2x;
int nvis;
int nvismax;
int scrolled = 0;
/*
* See how many lines on the screen are affected.
* And calculate row1x, row2x, and left at the same time.
*/
for (i = row1; i < row2 && w->ww_nvis[i] == 0; i++)
;
if (i >= row2) /* can't do any fancy stuff */
goto out;
row1x = i;
for (i = row2 - 1; i >= row1 && w->ww_nvis[i] == 0; i--)
;
if (i <= row1x)
goto out; /* just one line is easy */
row2x = i + 1;
/*
* See how much of this window is visible.
*/
nvismax = wwncol * (row2x - row1x);
nvis = 0;
for (i = row1x; i < row2x; i++)
nvis += w->ww_nvis[i];
/*
* If it's a good idea to scroll and the terminal can, then do it.
*/
if (nvis < nvismax / 2)
goto no_scroll; /* not worth it */
if ((dir > 0 ? tt.tt_scroll_down == 0 : tt.tt_scroll_up == 0) ||
((tt.tt_scroll_top != row1x || tt.tt_scroll_bot != row2x - 1) &&
tt.tt_setscroll == 0))
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if (tt.tt_delline == 0 || tt.tt_insline == 0)
goto no_scroll;
xxscroll(dir, row1x, row2x);
scrolled = 1;
/*
* Fix up the old screen.
*/
{
union ww_char *tmp;
union ww_char **cpp, **cqq;
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if (dir > 0) {
cpp = &wwos[row1x];
cqq = cpp + 1;
tmp = *cpp;
for (i = row2x - row1x; --i > 0;)
*cpp++ = *cqq++;
*cpp = tmp;
} else {
cpp = &wwos[row2x];
cqq = cpp - 1;
tmp = *cqq;
for (i = row2x - row1x; --i > 0;)
*--cpp = *--cqq;
*cqq = tmp;
}
for (i = wwncol; --i >= 0;)
tmp++->c_w = ' ';
}
no_scroll:
/*
* Fix the new screen.
*/
if (nvis == nvismax) {
/*
* Can shift whole lines.
*/
if (dir > 0) {
{
union ww_char *tmp;
union ww_char **cpp, **cqq;
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cpp = &wwns[row1x];
cqq = cpp + 1;
tmp = *cpp;
for (i = row2x - row1x; --i > 0;)
*cpp++ = *cqq++;
*cpp = tmp;
}
if (scrolled) {
char *p, *q;
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p = &wwtouched[row1x];
q = p + 1;
for (i = row2x - row1x; --i > 0;)
*p++ = *q++;
*p |= WWU_TOUCHED;
} else {
char *p;
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p = &wwtouched[row1x];
for (i = row2x - row1x; --i >= 0;)
*p++ |= WWU_TOUCHED;
}
wwredrawwin1(w, row1, row1x, dir);
wwredrawwin1(w, row2x - 1, row2 - leaveit, dir);
} else {
{
union ww_char *tmp;
union ww_char **cpp, **cqq;
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cpp = &wwns[row2x];
cqq = cpp - 1;
tmp = *cqq;
for (i = row2x - row1x; --i > 0;)
*--cpp = *--cqq;
*cqq = tmp;
}
if (scrolled) {
char *p, *q;
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p = &wwtouched[row2x];
q = p - 1;
for (i = row2x - row1x; --i > 0;)
*--p = *--q;
*q |= WWU_TOUCHED;
} else {
char *p;
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p = &wwtouched[row1x];
for (i = row2x - row1x; --i >= 0;)
*p++ |= WWU_TOUCHED;
}
wwredrawwin1(w, row1 + leaveit, row1x + 1, dir);
wwredrawwin1(w, row2x, row2, dir);
}
} else {
if (scrolled) {
char *p;
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p = &wwtouched[row1x];
for (i = row2x - row1x; --i >= 0;)
*p++ |= WWU_TOUCHED;
}
out:
if (dir > 0)
wwredrawwin1(w, row1, row2 - leaveit, dir);
else
wwredrawwin1(w, row1 + leaveit, row2, dir);
}
return scrolled;
}