Mon, 31 Mar 2014 14:08:00 +0200
improved network performance
universe@10 | 1 | /* |
universe@10 | 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
universe@10 | 3 | * |
universe@10 | 4 | * Copyright 2014 Mike Becker. All rights reserved. |
universe@10 | 5 | * |
universe@10 | 6 | * Redistribution and use in source and binary forms, with or without |
universe@10 | 7 | * modification, are permitted provided that the following conditions are met: |
universe@10 | 8 | * |
universe@10 | 9 | * 1. Redistributions of source code must retain the above copyright |
universe@10 | 10 | * notice, this list of conditions and the following disclaimer. |
universe@10 | 11 | * |
universe@10 | 12 | * 2. Redistributions in binary form must reproduce the above copyright |
universe@10 | 13 | * notice, this list of conditions and the following disclaimer in the |
universe@10 | 14 | * documentation and/or other materials provided with the distribution. |
universe@10 | 15 | * |
universe@10 | 16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
universe@10 | 17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
universe@10 | 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
universe@10 | 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
universe@10 | 20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
universe@10 | 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
universe@10 | 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
universe@10 | 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
universe@10 | 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
universe@10 | 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
universe@10 | 26 | * POSSIBILITY OF SUCH DAMAGE. |
universe@10 | 27 | * |
universe@10 | 28 | */ |
universe@10 | 29 | |
universe@16 | 30 | #include "rules.h" |
universe@10 | 31 | #include "rook.h" |
universe@10 | 32 | |
universe@16 | 33 | _Bool rook_chkrules(Move *move) { |
universe@21 | 34 | return move->torow == move->fromrow || move->tofile == move->fromfile; |
universe@21 | 35 | } |
universe@21 | 36 | |
universe@21 | 37 | _Bool rook_isblocked(Board board, Move *move) { |
universe@21 | 38 | |
universe@21 | 39 | if (move->torow == move->fromrow) { |
universe@21 | 40 | int d = move->tofile > move->fromfile ? 1 : -1; |
universe@21 | 41 | uint8_t f = move->fromfile; |
universe@21 | 42 | while (f != move->tofile-d) { |
universe@21 | 43 | f += d; |
universe@21 | 44 | if (board[move->fromrow][f]) { |
universe@21 | 45 | return 1; |
universe@21 | 46 | } |
universe@21 | 47 | } |
universe@21 | 48 | } else { |
universe@21 | 49 | int d = move->torow > move->fromrow ? 1 : -1; |
universe@21 | 50 | uint8_t r = move->fromrow; |
universe@21 | 51 | while (r != move->torow - d) { |
universe@21 | 52 | r += d; |
universe@21 | 53 | if (board[r][move->fromfile]) { |
universe@21 | 54 | return 1; |
universe@21 | 55 | } |
universe@21 | 56 | } |
universe@21 | 57 | } |
universe@21 | 58 | |
universe@19 | 59 | return 0; |
universe@10 | 60 | } |
universe@10 | 61 | |
universe@21 | 62 | static int rook_getloc_fixedrow(Board board, Move *move) { |
universe@21 | 63 | uint8_t file = POS_UNSPECIFIED; |
universe@21 | 64 | for (uint8_t f = 0 ; f < 8 ; f++) { |
universe@21 | 65 | if (board[move->fromrow][f] == move->piece) { |
universe@21 | 66 | if (file == POS_UNSPECIFIED) { |
universe@21 | 67 | file = f; |
universe@21 | 68 | } else { |
universe@21 | 69 | return AMBIGUOUS_MOVE; |
universe@21 | 70 | } |
universe@21 | 71 | } |
universe@21 | 72 | } |
universe@21 | 73 | if (file == POS_UNSPECIFIED) { |
universe@21 | 74 | return INVALID_POSITION; |
universe@21 | 75 | } else { |
universe@21 | 76 | move->fromfile = file; |
universe@21 | 77 | return VALID_MOVE_SYNTAX; |
universe@21 | 78 | } |
universe@21 | 79 | } |
universe@21 | 80 | |
universe@21 | 81 | static int rook_getloc_fixedfile(Board board, Move *move) { |
universe@21 | 82 | uint8_t row = POS_UNSPECIFIED; |
universe@21 | 83 | for (uint8_t r = 0 ; r < 8 ; r++) { |
universe@21 | 84 | if (board[r][move->fromfile] == move->piece) { |
universe@21 | 85 | if (row == POS_UNSPECIFIED) { |
universe@21 | 86 | row = r; |
universe@21 | 87 | } else { |
universe@21 | 88 | return AMBIGUOUS_MOVE; |
universe@21 | 89 | } |
universe@21 | 90 | } |
universe@21 | 91 | } |
universe@21 | 92 | if (row == POS_UNSPECIFIED) { |
universe@21 | 93 | return INVALID_POSITION; |
universe@21 | 94 | } else { |
universe@21 | 95 | move->fromrow = row; |
universe@21 | 96 | return VALID_MOVE_SYNTAX; |
universe@21 | 97 | } |
universe@10 | 98 | } |
universe@10 | 99 | |
universe@16 | 100 | int rook_getlocation(Board board, Move *move) { |
universe@21 | 101 | |
universe@21 | 102 | if (move->fromfile != POS_UNSPECIFIED) { |
universe@21 | 103 | if (move->fromfile == move->tofile) { |
universe@21 | 104 | return rook_getloc_fixedfile(board, move); |
universe@21 | 105 | } else { |
universe@21 | 106 | if (board[move->torow][move->fromfile] == move->piece) { |
universe@21 | 107 | move->fromrow = move->torow; |
universe@21 | 108 | return VALID_MOVE_SYNTAX; |
universe@21 | 109 | } else { |
universe@21 | 110 | return INVALID_POSITION; |
universe@21 | 111 | } |
universe@21 | 112 | } |
universe@21 | 113 | } |
universe@21 | 114 | |
universe@21 | 115 | if (move->fromrow != POS_UNSPECIFIED) { |
universe@21 | 116 | if (move->fromrow == move->torow) { |
universe@21 | 117 | return rook_getloc_fixedrow(board, move); |
universe@21 | 118 | } else { |
universe@21 | 119 | if (board[move->fromrow][move->tofile] == move->piece) { |
universe@21 | 120 | move->fromfile = move->tofile; |
universe@21 | 121 | return VALID_MOVE_SYNTAX; |
universe@21 | 122 | } else { |
universe@21 | 123 | return INVALID_POSITION; |
universe@21 | 124 | } |
universe@21 | 125 | } |
universe@21 | 126 | } |
universe@21 | 127 | |
universe@21 | 128 | Move chkrowmove = *move, chkfilemove = *move; |
universe@21 | 129 | |
universe@21 | 130 | chkrowmove.fromrow = move->torow; |
universe@21 | 131 | int chkrow = rook_getloc_fixedrow(board, &chkrowmove); |
universe@21 | 132 | |
universe@21 | 133 | chkfilemove.fromfile = move->tofile; |
universe@21 | 134 | int chkfile = rook_getloc_fixedfile(board, &chkfilemove); |
universe@21 | 135 | |
universe@21 | 136 | if ((chkrow == VALID_MOVE_SYNTAX && chkfile == VALID_MOVE_SYNTAX) || |
universe@21 | 137 | chkrow == AMBIGUOUS_MOVE || chkfile == AMBIGUOUS_MOVE) { |
universe@21 | 138 | return AMBIGUOUS_MOVE; |
universe@21 | 139 | } |
universe@21 | 140 | |
universe@21 | 141 | if (chkrow == VALID_MOVE_SYNTAX) { |
universe@21 | 142 | *move = chkrowmove; |
universe@21 | 143 | return VALID_MOVE_SYNTAX; |
universe@21 | 144 | } |
universe@21 | 145 | |
universe@21 | 146 | if (chkfile == VALID_MOVE_SYNTAX) { |
universe@21 | 147 | *move = chkfilemove; |
universe@21 | 148 | return VALID_MOVE_SYNTAX; |
universe@21 | 149 | } |
universe@21 | 150 | |
universe@21 | 151 | return INVALID_POSITION; |
universe@10 | 152 | } |