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diff --git a/tetris/shapes.c b/tetris/shapes.c
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+/*	$NetBSD: shapes.c,v 1.9 2014/06/11 16:47:39 christos Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek and Darren F. Provine.
+ *
+ * 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. 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.
+ *
+ *	@(#)shapes.c	8.1 (Berkeley) 5/31/93
+ */
+
+/*
+ * Tetris shapes and related routines.
+ *
+ * Note that the first 7 are `well known'.
+ */
+
+#include <sys/cdefs.h>
+#include "tetris.h"
+
+#define	TL	-B_COLS-1	/* top left */
+#define	TC	-B_COLS		/* top center */
+#define	TR	-B_COLS+1	/* top right */
+#define	ML	-1		/* middle left */
+#define	MR	1		/* middle right */
+#define	BL	B_COLS-1	/* bottom left */
+#define	BC	B_COLS		/* bottom center */
+#define	BR	B_COLS+1	/* bottom right */
+
+const struct shape shapes[] = {
+	/* 0*/	{ 7,  7,	{ TL, TC, MR, } },
+	/* 1*/	{ 1,  8,	{ TC, TR, ML, } },
+	/* 2*/	{ 2,  9,	{ ML, MR, BC, } },
+	/* 3*/	{ 3,  3,	{ TL, TC, ML, } },
+	/* 4*/	{ 4, 12,	{ ML, BL, MR, } },
+	/* 5*/	{ 5, 15,	{ ML, BR, MR, } },
+	/* 6*/	{ 6, 18,	{ ML, MR, 2   } },	/* sticks out */
+	/* 7*/	{ 7,  0,	{ TC, ML, BL, } },
+	/* 8*/	{ 1,  1,	{ TC, MR, BR, } },
+	/* 9*/	{ 2, 10,	{ TC, MR, BC, } },
+	/*10*/	{ 2, 11,	{ TC, ML, MR, } },
+	/*11*/	{ 2,  2,	{ TC, ML, BC, } },
+	/*12*/	{ 4, 13,	{ TC, BC, BR, } },
+	/*13*/	{ 4, 14,	{ TR, ML, MR, } },
+	/*14*/	{ 4,  4,	{ TL, TC, BC, } },
+	/*15*/	{ 5, 16,	{ TR, TC, BC, } },
+	/*16*/	{ 5, 17,	{ TL, MR, ML, } },
+	/*17*/	{ 5,  5,	{ TC, BC, BL, } },
+	/*18*/	{ 6,  6,	{ TC, BC, 2*B_COLS } }	/* sticks out */
+};
+
+/*
+ * Return true iff the given shape fits in the given position,
+ * taking the current board into account.
+ */
+int
+fits_in(const struct shape *shape, int pos)
+{
+	const int *o = shape->off;
+
+	if (board[pos] || board[pos + *o++] || board[pos + *o++] ||
+	    board[pos + *o])
+		return 0;
+	return 1;
+}
+
+/*
+ * Write the given shape into the current board, turning it on
+ * if `onoff' is 1, and off if `onoff' is 0.
+ */
+void
+place(const struct shape *shape, int pos, int onoff)
+{
+	const int *o = shape->off;
+	onoff = onoff ? shape->color : 0;
+
+	board[pos] = onoff;
+	board[pos + *o++] = onoff;
+	board[pos + *o++] = onoff;
+	board[pos + *o] = onoff;
+}