1 files changed, 88 insertions, 0 deletions
diff --git a/usr.bin/window/wwadd.c b/usr.bin/window/wwadd.c
new file mode 100644
index 0000000..377464a
--- /dev/null
+++ b/usr.bin/window/wwadd.c
@@ -0,0 +1,88 @@
+/*
+ * 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
+static char sccsid[] = "@(#)wwadd.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+#include "ww.h"
+
+/*
+ * Stick w1 behind w2.
+ */
+wwadd(w1, w2)
+register struct ww *w1;
+struct ww *w2;
+{
+	register i;
+	register struct ww *w;
+
+	w1->ww_order = w2->ww_order + 1;
+	w1->ww_back = w2;
+	w1->ww_forw = w2->ww_forw;
+	w2->ww_forw->ww_back = w1;
+	w2->ww_forw = w1;
+
+	for (w = w1->ww_forw; w != &wwhead; w = w->ww_forw)
+		w->ww_order++;
+	for (i = w1->ww_i.t; i < w1->ww_i.b; i++) {
+		register j;
+		register char *smap = wwsmap[i];
+		register char *win = w1->ww_win[i];
+		union ww_char *ns = wwns[i];
+		union ww_char *buf = w1->ww_buf[i];
+		int nvis = 0;
+		int nchanged = 0;
+
+		for (j = w1->ww_i.l; j < w1->ww_i.r; j++) {
+			w = wwindex[smap[j]];
+			if (w1->ww_order > w->ww_order)
+				continue;
+			if (win[j] & WWM_GLS)
+				continue;
+			if (w != &wwnobody && w->ww_win[i][j] == 0)
+				w->ww_nvis[i]--;
+			smap[j] = w1->ww_index;
+			if (win[j] == 0)
+				nvis++;
+			ns[j].c_w = buf[j].c_w ^ win[j] << WWC_MSHIFT;
+			nchanged++;
+		}
+		if (nchanged > 0)
+			wwtouched[i] |= WWU_TOUCHED;
+		w1->ww_nvis[i] = nvis;
+	}
+}