--- a/src/rules/bishop.c Sat Mar 29 16:53:58 2014 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,128 +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 "bishop.h"
-#include "rules.h"
-#include <math.h>
-
-_Bool bishop_chkrules(Move* move) {
- return abs(move->torow-move->fromrow) == abs(move->tofile-move->fromfile);
-}
-
-_Bool bishop_isblocked(Board board, Move *move) {
- int dy = move->torow > move->fromrow ? 1 : -1;
- int dx = move->tofile > move->fromfile ? 1 : -1;
-
- uint8_t y = move->fromrow;
- uint8_t x = move->fromfile;
-
- do {
- x += dx;
- y += dy;
- if (board[y][x]) {
- return TRUE;
- }
- } while (x != move->tofile && y != move->torow);
-
- return FALSE;
-}
-
-static int bishop_getloc_fixedfile(Board board, Move *move) {
- uint8_t d = abs(move->fromfile - move->tofile);
- if (board[move->torow - d][move->fromfile] == move->piece) {
- move->fromrow = move->torow - d;
- }
- if (board[move->torow + d][move->fromfile] == move->piece) {
- if (move->fromrow == POS_UNSPECIFIED) {
- move->fromrow = move->torow + d;
- } else {
- return AMBIGUOUS_MOVE; /* rare situation after promotion */
- }
- }
- return move->fromrow == POS_UNSPECIFIED ?
- INVALID_POSITION : VALID_MOVE_SYNTAX;
-}
-
-static int bishop_getloc_fixedrow(Board board, Move *move) {
- uint8_t d = abs(move->fromrow - move->torow);
- if (board[move->fromrow][move->tofile - d] == move->piece) {
- move->fromfile = move->tofile - d;
- }
- if (board[move->fromrow][move->tofile + d] == move->piece) {
- if (move->fromfile == POS_UNSPECIFIED) {
- move->fromfile = move->tofile + d;
- } else {
- return AMBIGUOUS_MOVE; /* rare situation after promotion */
- }
- }
- return move->fromfile == POS_UNSPECIFIED ?
- INVALID_POSITION : VALID_MOVE_SYNTAX;
-}
-
-int bishop_getlocation(Board board, Move *move) {
-
- if (move->fromfile != POS_UNSPECIFIED) {
- return bishop_getloc_fixedfile(board, move);
- }
-
- if (move->fromrow != POS_UNSPECIFIED) {
- return bishop_getloc_fixedrow(board, move);
- }
-
- _Bool amb = FALSE;
- for (int d = -7 ; d < 8 ; d++) {
- uint8_t row = move->torow + d;
- if (isidx(row)) {
- uint8_t file = move->tofile + d;
- if (isidx(file) && board[row][file] == move->piece) {
- if (amb) {
- return AMBIGUOUS_MOVE;
- }
- amb = TRUE;
- move->fromrow = row;
- move->fromfile = file;
- }
- file = move->tofile - d;
- if (isidx(file) && board[row][file] == move->piece) {
- if (amb) {
- return AMBIGUOUS_MOVE;
- }
- amb = TRUE;
- move->fromrow = row;
- move->fromfile = file;
- }
- }
- }
-
- if (move->fromrow == POS_UNSPECIFIED || move->fromfile == POS_UNSPECIFIED) {
- return INVALID_POSITION;
- } else {
- return VALID_MOVE_SYNTAX;
- }
-}