initial import of NetBSD tree

1 files changed, 240 insertions, 0 deletions

diff --git a/usr.bin/window/wwscroll.c b/usr.bin/window/wwscroll.c
new file mode 100644
index 00000000000..07d8d2e2802
--- /dev/null
+++ b/usr.bin/window/wwscroll.c
@@ -0,0 +1,240 @@
+/*	$NetBSD: wwscroll.c,v 1.3 1995/09/28 10:35:53 tls 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.
+ */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)wwscroll.c	8.1 (Berkeley) 6/6/93";
+#else
+static char rcsid[] = "$NetBSD: wwscroll.c,v 1.3 1995/09/28 10:35:53 tls Exp $";
+#endif
+#endif /* not lint */
+
+#include "ww.h"
+#include "tt.h"
+
+wwscroll(w, n)
+register struct ww *w;
+int n;
+{
+	register dir;
+	register top;
+
+	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.
+ */
+wwscroll1(w, row1, row2, dir, leaveit)
+register struct ww *w;
+int row1, row2, dir;
+int leaveit;
+{
+	register i;
+	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)
+		if (tt.tt_delline == 0 || tt.tt_insline == 0)
+			goto no_scroll;
+	xxscroll(dir, row1x, row2x);
+	scrolled = 1;
+	/*
+	 * Fix up the old screen.
+	 */
+	{
+		register union ww_char *tmp;
+		register union ww_char **cpp, **cqq;
+
+		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) {
+			{
+				register union ww_char *tmp;
+				register union ww_char **cpp, **cqq;
+
+				cpp = &wwns[row1x];
+				cqq = cpp + 1;
+				tmp = *cpp;
+				for (i = row2x - row1x; --i > 0;)
+					*cpp++ = *cqq++;
+				*cpp = tmp;
+			}
+			if (scrolled) {
+				register char *p, *q;
+
+				p = &wwtouched[row1x];
+				q = p + 1;
+				for (i = row2x - row1x; --i > 0;)
+					*p++ = *q++;
+				*p |= WWU_TOUCHED;
+			} else {
+				register char *p;
+
+				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 {
+			{
+				register union ww_char *tmp;
+				register union ww_char **cpp, **cqq;
+
+				cpp = &wwns[row2x];
+				cqq = cpp - 1;
+				tmp = *cqq;
+				for (i = row2x - row1x; --i > 0;)
+					*--cpp = *--cqq;
+				*cqq = tmp;
+			}
+			if (scrolled) {
+				register char *p, *q;
+
+				p = &wwtouched[row2x];
+				q = p - 1;
+				for (i = row2x - row1x; --i > 0;)
+					*--p = *--q;
+				*q |= WWU_TOUCHED;
+			} else {
+				register char *p;
+
+				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) {
+			register char *p;
+
+			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;
+}