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diff --git a/usr.bin/tn3270/sys_curses/terminal.h b/usr.bin/tn3270/sys_curses/terminal.h
new file mode 100644
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+++ b/usr.bin/tn3270/sys_curses/terminal.h
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+/*-
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * 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.
+ *
+ *	@(#)terminal.h	8.1 (Berkeley) 6/6/93
+ */
+
+#define	INCLUDED_TERMINAL
+
+/*
+ * In the situation where we have a copy of the terminal screen in front
+ * of us, here are some macros to deal with them.
+ */
+
+#define TermAttributes(x)	(TermIsStartField(x)? GetTerminal(x)&0xff : \
+				    GetTerminal(WhereTermAttrByte(x))&0xff)
+#define TermIsStartField(x)	((GetTerminal(x)&ATTR_MASK) == ATTR_MASK)
+#define TermNewField(p,a)	SetTerminal(p, (a)|ATTR_MASK)
+#define TermDeleteField(p)	SetTerminal(p, 0)
+#define TermIsNonDisplay(x)	\
+		    ((TermAttributes(x)&ATTR_DSPD_MASK) == ATTR_DSPD_NONDISPLAY)
+#define TermIsHighlighted(x) \
+		(((TermAttributes(x)&ATTR_DSPD_MASK) == ATTR_DSPD_HIGH) \
+				    && !TermIsStartField(x))
+
+#define TerminalCharacterAttr(c,p,a)	(IsNonDisplayAttr(a) ? ' ':c)
+#define TerminalCharacter(c,p)	TerminalCharacterAttr(c,p,FieldAttributes(p))
+
+	/*
+	 * Is the screen formatted?  Some algorithms change depending
+	 * on whether there are any attribute bytes lying around.
+	 */
+#define	TerminalFormattedScreen() \
+	    ((WhereTermAttrByte(0) != 0) || ((GetTerminal(0)&ATTR_MASK) == ATTR_MASK))
+
+#define NeedToRedisplayFields(p) ((TermIsNonDisplay(p) != IsNonDisplay(p)) || \
+				(TermIsHighlighted(p) != IsHighlighted(p)))
+#define NeedToRedisplayFieldsAttr(p,c) ( \
+			(TermIsNonDisplay(p) != IsNonDisplayAttr(c)) || \
+			(TermIsHighlighted(p) != IsHighlightedAttr(c)))
+
+#define NotVisuallyCompatibleAttributes(p,c,d) ( \
+			(IsNonDisplayAttr(c) != IsNonDisplayAttr(d)) || \
+			(IsHighlightedAttr(c) != IsHighlightedAttr(d)))
+
+#define NeedToRedisplayAttr(c,p,a) \
+			((c != GetTerminal(p)) || NeedToRedisplayFieldsAttr(p,a))
+#define NeedToRedisplay(c,p)	NeedToRedisplayAttr(c,p,FieldAttributes(p))
+
+
+#define GetTerminal(i)		GetGeneric(i, Terminal)
+#define GetTerminalPointer(p)	GetGenericPointer(p)
+#define SetTerminal(i,c)	SetGeneric(i,c,Terminal)