ascii tetris!

1 files changed, 111 insertions, 0 deletions

diff --git a/tetris/shapes.c b/tetris/shapes.c
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+/*-
+ * 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. 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.
+ *
+ *	@(#)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 */
+
+struct shape shapes[] = {
+	/* 0*/	7,	TL, TC, MR,
+	/* 1*/	8,	TC, TR, ML,
+	/* 2*/	9,	ML, MR, BC,
+	/* 3*/	3,	TL, TC, ML,
+	/* 4*/	12,	ML, BL, MR,
+	/* 5*/	15,	ML, BR, MR,
+	/* 6*/	18,	ML, MR, /* sticks out */ 2,
+	/* 7*/	0,	TC, ML, BL,
+	/* 8*/	1,	TC, MR, BR,
+	/* 9*/	10,	TC, MR, BC,
+	/*10*/	11,	TC, ML, MR,
+	/*11*/	2,	TC, ML, BC,
+	/*12*/	13,	TC, BC, BR,
+	/*13*/	14,	TR, ML, MR,
+	/*14*/	4,	TL, TC, BC,
+	/*15*/	16,	TR, TC, BC,
+	/*16*/	17,	TL, MR, ML,
+	/*17*/	5,	TC, BC, BL,
+	/*18*/	6,	TC, BC, /* sticks out */ 2*B_COLS,
+};
+
+/*
+ * Return true iff the given shape fits in the given position,
+ * taking the current board into account.
+ */
+int
+fits_in(shape, pos)
+	struct shape *shape;
+	register int pos;
+{
+	register 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(shape, pos, onoff)
+	struct shape *shape;
+	register int pos, onoff;
+{
+	register int *o = shape->off;
+
+	board[pos] = onoff;
+	board[pos + *o++] = onoff;
+	board[pos + *o++] = onoff;
+	board[pos + *o] = onoff;
+}