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-rw-r--r--usr.bin/window/xxflush.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/usr.bin/window/xxflush.c b/usr.bin/window/xxflush.c
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+++ b/usr.bin/window/xxflush.c
@@ -0,0 +1,196 @@
+/*
+ * Copyright (c) 1989, 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[] = "@(#)xxflush.c 8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+#include "ww.h"
+#include "xx.h"
+#include "tt.h"
+
+xxflush(intr)
+ register intr;
+{
+ register struct xx *xp, *xq;
+
+ for (xp = xx_head; xp != 0 && !(intr && wwinterrupt()); xp = xq) {
+ switch (xp->cmd) {
+ case xc_move:
+ if (xp->link == 0)
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ break;
+ case xc_scroll:
+ xxflush_scroll(xp);
+ break;
+ case xc_inschar:
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ tt.tt_nmodes = xp->arg3;
+ (*tt.tt_inschar)(xp->arg2);
+ break;
+ case xc_insspace:
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ (*tt.tt_insspace)(xp->arg2);
+ break;
+ case xc_delchar:
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ (*tt.tt_delchar)(xp->arg2);
+ break;
+ case xc_clear:
+ (*tt.tt_clear)();
+ break;
+ case xc_clreos:
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ (*tt.tt_clreos)();
+ break;
+ case xc_clreol:
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ (*tt.tt_clreol)();
+ break;
+ case xc_write:
+ (*tt.tt_move)(xp->arg0, xp->arg1);
+ tt.tt_nmodes = xp->arg3;
+ (*tt.tt_write)(xp->buf, xp->arg2);
+ break;
+ }
+ xq = xp->link;
+ xxfree(xp);
+ }
+ if ((xx_head = xp) == 0) {
+ xx_tail = 0;
+ xxbufp = xxbuf;
+ }
+ ttflush();
+}
+
+xxflush_scroll(xp)
+ register struct xx *xp;
+{
+ register struct xx *xq;
+
+ top:
+ if (xp->arg0 == 0)
+ return;
+ /*
+ * We handle retain (da and db) by putting the burden on scrolling up,
+ * which is the less common operation. It must ensure that
+ * text is not pushed below the screen, so scrolling down doesn't
+ * have to worry about it.
+ *
+ * Try scrolling region (or scrolling the whole screen) first.
+ * Can we assume "sr" doesn't push text below the screen
+ * so we don't have to worry about retain below?
+ * What about scrolling down with a newline? It probably does
+ * push text above (with da). Scrolling up would then have
+ * to take care of that.
+ * It's easy to be fool proof, but that slows things down.
+ * The current solution is to disallow tt_scroll_up if da or db is true
+ * but cs (scrolling region) is not. Again, we sacrifice scrolling
+ * up in favor of scrolling down. The idea is having scrolling regions
+ * probably means we can scroll (even the whole screen) with impunity.
+ * This lets us work efficiently on simple terminals (use newline
+ * on the bottom to scroll), on any terminal without retain, and
+ * on vt100 style scrolling regions (I think).
+ */
+ if (xp->arg0 > 0) {
+ if ((xq = xp->link) != 0 && xq->cmd == xc_scroll &&
+ xp->arg2 == xq->arg2 && xq->arg0 < 0) {
+ if (xp->arg1 < xq->arg1) {
+ if (xp->arg2 - xp->arg0 <= xq->arg1) {
+ xq->arg0 = xp->arg0;
+ xq->arg1 = xp->arg1;
+ xq->arg2 = xp->arg2;
+ return;
+ }
+ xp->arg2 = xq->arg1 + xp->arg0;
+ xq->arg0 += xp->arg0;
+ xq->arg1 = xp->arg2;
+ if (xq->arg0 > 0)
+ xq->arg1 -= xq->arg0;
+ goto top;
+ } else {
+ if (xp->arg1 - xq->arg0 >= xp->arg2)
+ return;
+ xq->arg2 = xp->arg1 - xq->arg0;
+ xp->arg0 += xq->arg0;
+ xp->arg1 = xq->arg2;
+ if (xp->arg0 < 0)
+ xp->arg1 += xp->arg0;
+ goto top;
+ }
+ }
+ if (xp->arg0 > xp->arg2 - xp->arg1)
+ xp->arg0 = xp->arg2 - xp->arg1;
+ if (tt.tt_scroll_down) {
+ if (tt.tt_scroll_top != xp->arg1 ||
+ tt.tt_scroll_bot != xp->arg2 - 1) {
+ if (tt.tt_setscroll == 0)
+ goto down;
+ (*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
+ }
+ tt.tt_scroll_down(xp->arg0);
+ } else {
+ down:
+ (*tt.tt_move)(xp->arg1, 0);
+ (*tt.tt_delline)(xp->arg0);
+ if (xp->arg2 < tt.tt_nrow) {
+ (*tt.tt_move)(xp->arg2 - xp->arg0, 0);
+ (*tt.tt_insline)(xp->arg0);
+ }
+ }
+ } else {
+ xp->arg0 = - xp->arg0;
+ if (xp->arg0 > xp->arg2 - xp->arg1)
+ xp->arg0 = xp->arg2 - xp->arg1;
+ if (tt.tt_scroll_up) {
+ if (tt.tt_scroll_top != xp->arg1 ||
+ tt.tt_scroll_bot != xp->arg2 - 1) {
+ if (tt.tt_setscroll == 0)
+ goto up;
+ (*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
+ }
+ tt.tt_scroll_up(xp->arg0);
+ } else {
+ up:
+ if (tt.tt_retain || xp->arg2 != tt.tt_nrow) {
+ (*tt.tt_move)(xp->arg2 - xp->arg0, 0);
+ (*tt.tt_delline)(xp->arg0);
+ }
+ (*tt.tt_move)(xp->arg1, 0);
+ (*tt.tt_insline)(xp->arg0);
+ }
+ }
+}
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