--- a/src/rules/knight.c Sat Mar 29 16:53:58 2014 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,133 +0,0 @@
-/*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
- *
- * Copyright 2014 Mike Becker. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
- *
- */
-
-#include "knight.h"
-#include "rules.h"
-#include <math.h>
-
-_Bool knight_chkrules(Move *move) {
- int dx = abs(move->fromfile - move->tofile);
- int dy = abs(move->fromrow - move->torow);
-
- return (dx == 2 && dy == 1) || (dx == 1 && dy == 2);
-}
-
-static int knight_getloc_fixedrow(Board board, Move *move) {
- int d = 3 - abs(move->fromrow - move->torow);
-
- if (d == 1 || d == 2) {
- if (move->tofile < 6 &&
- board[move->fromrow][move->tofile + d] == move->piece) {
- if (move->fromfile == POS_UNSPECIFIED) {
- move->fromfile = move->tofile + d;
- return VALID_MOVE_SYNTAX;
- } else {
- return AMBIGUOUS_MOVE;
- }
- }
- if (move->tofile > 1 &&
- board[move->fromrow][move->tofile - d] == move->piece) {
- if (move->fromfile == POS_UNSPECIFIED) {
- move->fromfile = move->tofile - d;
- return VALID_MOVE_SYNTAX;
- } else {
- return AMBIGUOUS_MOVE;
- }
- }
- }
-
- return INVALID_POSITION;
-}
-
-static int knight_getloc_fixedfile(Board board, Move *move) {
- int d = 3 - abs(move->fromfile - move->tofile);
-
- if (d == 1 || d == 2) {
- if (move->torow < 6 &&
- board[move->torow + d][move->fromfile] == move->piece) {
- if (move->fromrow == POS_UNSPECIFIED) {
- move->fromrow = move->torow + d;
- return VALID_MOVE_SYNTAX;
- } else {
- return AMBIGUOUS_MOVE;
- }
- }
- if (move->torow > 1 &&
- board[move->torow - d][move->fromfile] == move->piece) {
- if (move->fromrow == POS_UNSPECIFIED) {
- move->fromrow = move->torow - d;
- return VALID_MOVE_SYNTAX;
- } else {
- return AMBIGUOUS_MOVE;
- }
- }
- }
-
- return INVALID_POSITION;
-}
-
-int knight_getlocation(Board board, Move *move) {
-
- if (move->fromfile != POS_UNSPECIFIED) {
- return knight_getloc_fixedfile(board, move);
- }
-
- if (move->fromrow != POS_UNSPECIFIED) {
- return knight_getloc_fixedrow(board, move);
- }
-
- for (int x = -2 ; x <= 2 ; x++) {
- if (x == 0) {
- continue;
- }
- for (int y = -2 ; y <= 2 ; y++) {
- if (y == 0 || y == x) {
- continue;
- }
- uint8_t cx = move->tofile + x;
- uint8_t cy = move->torow + y;
-
- if (isidx(cx) && isidx(cy) && board[cy][cx] == move->piece) {
- if (move->fromfile == POS_UNSPECIFIED
- && move->fromrow == POS_UNSPECIFIED) {
- move->fromfile = cx;
- move->fromrow = cy;
- } else {
- return AMBIGUOUS_MOVE;
- }
- }
- }
- }
-
- if (move->fromfile == POS_UNSPECIFIED || move->fromrow == POS_UNSPECIFIED) {
- return INVALID_POSITION;
- } else {
- return VALID_MOVE_SYNTAX;
- }
-}