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199 lines
6.0 KiB
C
199 lines
6.0 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)xxflush.c 8.1 (Berkeley) 6/6/93";
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static char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include "ww.h"
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#include "xx.h"
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#include "tt.h"
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xxflush(intr)
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register intr;
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{
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register struct xx *xp, *xq;
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for (xp = xx_head; xp != 0 && !(intr && wwinterrupt()); xp = xq) {
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switch (xp->cmd) {
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case xc_move:
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if (xp->link == 0)
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(*tt.tt_move)(xp->arg0, xp->arg1);
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break;
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case xc_scroll:
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xxflush_scroll(xp);
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break;
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case xc_inschar:
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(*tt.tt_move)(xp->arg0, xp->arg1);
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tt.tt_nmodes = xp->arg3;
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(*tt.tt_inschar)(xp->arg2);
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break;
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case xc_insspace:
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(*tt.tt_move)(xp->arg0, xp->arg1);
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(*tt.tt_insspace)(xp->arg2);
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break;
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case xc_delchar:
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(*tt.tt_move)(xp->arg0, xp->arg1);
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(*tt.tt_delchar)(xp->arg2);
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break;
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case xc_clear:
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(*tt.tt_clear)();
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break;
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case xc_clreos:
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(*tt.tt_move)(xp->arg0, xp->arg1);
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(*tt.tt_clreos)();
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break;
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case xc_clreol:
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(*tt.tt_move)(xp->arg0, xp->arg1);
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(*tt.tt_clreol)();
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break;
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case xc_write:
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(*tt.tt_move)(xp->arg0, xp->arg1);
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tt.tt_nmodes = xp->arg3;
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(*tt.tt_write)(xp->buf, xp->arg2);
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break;
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}
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xq = xp->link;
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xxfree(xp);
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}
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if ((xx_head = xp) == 0) {
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xx_tail = 0;
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xxbufp = xxbuf;
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}
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ttflush();
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}
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xxflush_scroll(xp)
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register struct xx *xp;
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{
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register struct xx *xq;
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top:
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if (xp->arg0 == 0)
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return;
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/*
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* We handle retain (da and db) by putting the burden on scrolling up,
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* which is the less common operation. It must ensure that
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* text is not pushed below the screen, so scrolling down doesn't
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* have to worry about it.
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*
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* Try scrolling region (or scrolling the whole screen) first.
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* Can we assume "sr" doesn't push text below the screen
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* so we don't have to worry about retain below?
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* What about scrolling down with a newline? It probably does
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* push text above (with da). Scrolling up would then have
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* to take care of that.
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* It's easy to be fool proof, but that slows things down.
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* The current solution is to disallow tt_scroll_up if da or db is true
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* but cs (scrolling region) is not. Again, we sacrifice scrolling
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* up in favor of scrolling down. The idea is having scrolling regions
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* probably means we can scroll (even the whole screen) with impunity.
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* This lets us work efficiently on simple terminals (use newline
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* on the bottom to scroll), on any terminal without retain, and
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* on vt100 style scrolling regions (I think).
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*/
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if (xp->arg0 > 0) {
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if ((xq = xp->link) != 0 && xq->cmd == xc_scroll &&
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xp->arg2 == xq->arg2 && xq->arg0 < 0) {
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if (xp->arg1 < xq->arg1) {
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if (xp->arg2 - xp->arg0 <= xq->arg1) {
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xq->arg0 = xp->arg0;
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xq->arg1 = xp->arg1;
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xq->arg2 = xp->arg2;
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return;
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}
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xp->arg2 = xq->arg1 + xp->arg0;
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xq->arg0 += xp->arg0;
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xq->arg1 = xp->arg2;
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if (xq->arg0 > 0)
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xq->arg1 -= xq->arg0;
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goto top;
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} else {
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if (xp->arg1 - xq->arg0 >= xp->arg2)
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return;
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xq->arg2 = xp->arg1 - xq->arg0;
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xp->arg0 += xq->arg0;
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xp->arg1 = xq->arg2;
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if (xp->arg0 < 0)
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xp->arg1 += xp->arg0;
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goto top;
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}
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}
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if (xp->arg0 > xp->arg2 - xp->arg1)
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xp->arg0 = xp->arg2 - xp->arg1;
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if (tt.tt_scroll_down) {
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if (tt.tt_scroll_top != xp->arg1 ||
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tt.tt_scroll_bot != xp->arg2 - 1) {
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if (tt.tt_setscroll == 0)
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goto down;
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(*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
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}
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tt.tt_scroll_down(xp->arg0);
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} else {
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down:
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(*tt.tt_move)(xp->arg1, 0);
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(*tt.tt_delline)(xp->arg0);
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if (xp->arg2 < tt.tt_nrow) {
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(*tt.tt_move)(xp->arg2 - xp->arg0, 0);
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(*tt.tt_insline)(xp->arg0);
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}
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}
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} else {
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xp->arg0 = - xp->arg0;
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if (xp->arg0 > xp->arg2 - xp->arg1)
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xp->arg0 = xp->arg2 - xp->arg1;
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if (tt.tt_scroll_up) {
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if (tt.tt_scroll_top != xp->arg1 ||
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tt.tt_scroll_bot != xp->arg2 - 1) {
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if (tt.tt_setscroll == 0)
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goto up;
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(*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
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}
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tt.tt_scroll_up(xp->arg0);
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} else {
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up:
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if (tt.tt_retain || xp->arg2 != tt.tt_nrow) {
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(*tt.tt_move)(xp->arg2 - xp->arg0, 0);
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(*tt.tt_delline)(xp->arg0);
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}
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(*tt.tt_move)(xp->arg1, 0);
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(*tt.tt_insline)(xp->arg0);
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}
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}
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}
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