1 files changed, 79 insertions, 0 deletions
diff --git a/usr/src/lib/libcurses/screen/overlap.c b/usr/src/lib/libcurses/screen/overlap.c
new file mode 100644
index 0000000000..75c799a933
--- /dev/null
+++ b/usr/src/lib/libcurses/screen/overlap.c
@@ -0,0 +1,79 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*	Copyright (c) 1988 AT&T	*/
+/*	  All Rights Reserved	*/
+
+/*
+ * University Copyright- Copyright (c) 1982, 1986, 1988
+ * The Regents of the University of California
+ * All Rights Reserved
+ *
+ * University Acknowledgment- Portions of this document are derived from
+ * software developed by the University of California, Berkeley, and its
+ * contributors.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*LINTLIBRARY*/
+
+#include	<sys/types.h>
+#include	"curses_inc.h"
+
+/*
+ * This routine writes Srcwin on Dstwin.
+ * Only the overlapping region is copied.
+ */
+
+int
+_overlap(WINDOW *Srcwin, WINDOW *Dstwin, int Overlay)
+{
+	int	sby, sbx, sey, sex, dby, dbx, dey, dex,
+		top, bottom, left, right;
+
+#ifdef	DEBUG
+	if (outf)
+		fprintf(outf, "OVERWRITE(0%o, 0%o);\n", Srcwin, Dstwin);
+#endif	/* DEBUG */
+
+	sby = Srcwin->_begy;	dby = Dstwin->_begy;
+	sbx = Srcwin->_begx;	dbx = Dstwin->_begx;
+	sey = sby + Srcwin->_maxy;	dey = dby + Dstwin->_maxy;
+	sex = sbx + Srcwin->_maxx;	dex = dbx + Dstwin->_maxx;
+
+	if (sey < dby || sby > dey || sex < dbx || sbx > dex)
+		return (ERR);
+
+	top = _MAX(sby, dby);	bottom = _MIN(sey, dey);
+	left = _MAX(sbx, dbx);	right = _MIN(sex, dex);
+
+	sby = top - sby;		sbx = left - sbx;
+	dey = bottom - dby - 1;	dex = right - dbx - 1;
+	dby = top - dby;		dbx = left - dbx;
+
+	return (copywin(Srcwin, Dstwin, sby, sbx, dby, dbx, dey, dex, Overlay));
+}