[5449] | 1 | //tic-tac-toe.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2012 |
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| 5 | * |
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| 6 | * This file is part of roard a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * RoarAudio is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include <roard/include/roard.h> |
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| 27 | |
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| 28 | #define _FREE ' ' |
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| 29 | #define _PLAYER 'X' |
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| 30 | #define _COMPUTER 'O' |
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| 31 | #define _NOBODY '#' |
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| 32 | |
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| 33 | #define _DISPLAY \ |
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[5461] | 34 | /* Bring Telnet in right mode: */ \ |
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| 35 | /* IAC WILL ECHO IAC WILL SUPPRESS_GO_AHEAD IAC WONT LINEMODE */ \ |
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| 36 | /* 255 251 1 255 251 3 255 252 34 */ \ |
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| 37 | "\377\373\001\377\373\003\377\374\042" \ |
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[5449] | 38 | "\e[2J\e[H" \ |
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[5461] | 39 | " Tic Tac Toe\r\n" \ |
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| 40 | " (running: roard " ROAR_VERSION_STRING ")\r\n" \ |
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| 41 | "\r\n" \ |
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| 42 | "Game board: IDs:\r\n" \ |
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| 43 | " %c | %c | %c 7 | 8 | 9\r\n" \ |
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| 44 | "---+---+--- ---+---+---\r\n" \ |
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| 45 | " %c | %c | %c 4 | 5 | 6\r\n" \ |
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| 46 | "---+---+--- ---+---+---\r\n" \ |
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| 47 | " %c | %c | %c 1 | 2 | 3\r\n" \ |
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| 48 | "\r\n" \ |
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| 49 | "%s\r\n" |
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[5449] | 50 | #define _DISPLAY_BUFFER_LEN 1024 |
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| 51 | |
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| 52 | #define MSG__YOUR_TURN "It's your turn. -- press any ID or q to quit --" |
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| 53 | #define MSG__CANNOT_PUT_HERE "You can not put your mark here. -- try again another position --" |
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| 54 | #define MSG__WON_PLAYER "You won. -- press any key to continue or q to quit --" |
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| 55 | #define MSG__WON_COMPUTER "I won. -- press any key to continue or q to quit --" |
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| 56 | #define MSG__WON_NOBODY "Nobody won. -- press any key to continue or q to quit --" |
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| 57 | |
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| 58 | typedef char game_state[9]; |
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| 59 | |
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| 60 | struct test_result { |
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| 61 | int score_player, score_computer; |
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| 62 | int free; |
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| 63 | }; |
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| 64 | |
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| 65 | struct stats { |
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| 66 | int free; |
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| 67 | struct test_result results[9]; |
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| 68 | }; |
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| 69 | |
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| 70 | static void new_game(game_state * state) { |
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| 71 | memset(state, _FREE, sizeof(game_state)); |
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| 72 | } |
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| 73 | |
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| 74 | static int try_put(game_state * state, int id, char player) { |
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| 75 | if ( id < 0 || id > 8 ) |
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| 76 | return -1; |
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| 77 | |
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| 78 | if ( (*state)[id] == _FREE ) { |
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| 79 | (*state)[id] = player; |
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| 80 | return 0; |
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| 81 | } else { |
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| 82 | return -1; |
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| 83 | } |
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| 84 | }; |
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| 85 | |
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| 86 | static void analyze(struct stats * stats, game_state * state) { |
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| 87 | static const int textvec[3][3][2] = { |
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| 88 | {{0, 3}, {1, 3}, {2, 3}}, |
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| 89 | {{0, 1}, {3, 1}, {6, 1}}, |
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| 90 | {{0, 1}, {4, 0}, {8, -1}} |
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| 91 | }; |
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| 92 | struct test_result * res; |
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| 93 | int i, j; |
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| 94 | int test; |
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| 95 | |
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| 96 | stats->free = 0; |
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| 97 | |
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| 98 | for (i = 0; i < 9; i++) |
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| 99 | if ( (*state)[i] == _FREE ) |
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| 100 | stats->free++; |
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| 101 | |
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| 102 | for (test = 0; test < 3; test++) { |
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| 103 | for (i = 0; i < 3; i++) { |
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| 104 | res = &(stats->results[i+test*3]); |
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| 105 | res->score_player = 0; |
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| 106 | res->score_computer = 0; |
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| 107 | res->free = -1; |
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| 108 | for (j = 0; j < 3; j++) { |
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| 109 | switch ((*state)[textvec[test][j][0] + textvec[test][j][1]*i]) { |
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| 110 | case _PLAYER: res->score_player++; break; |
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| 111 | case _COMPUTER: res->score_computer++; break; |
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| 112 | case _FREE: res->free = textvec[test][j][0] + textvec[test][j][1]*i; break; |
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| 113 | } |
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| 114 | } |
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| 115 | } |
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| 116 | } |
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| 117 | } |
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| 118 | |
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| 119 | static char check_won(game_state * state) { |
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| 120 | struct stats stats; |
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| 121 | int i; |
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| 122 | |
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| 123 | analyze(&stats, state); |
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| 124 | |
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| 125 | for (i = 0; i < 9; i++) { |
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| 126 | if ( stats.results[i].score_player == 3 ) |
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| 127 | return _PLAYER; |
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| 128 | if ( stats.results[i].score_computer == 3 ) |
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| 129 | return _COMPUTER; |
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| 130 | } |
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| 131 | |
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| 132 | if ( stats.free == 0) |
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| 133 | return _NOBODY; |
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| 134 | |
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| 135 | return 0; |
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| 136 | } |
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| 137 | |
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| 138 | static void auto_move(game_state * state, int player_move) { |
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| 139 | static const int corner[4] = {0, 2, 6, 8}; |
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| 140 | static const int side[4] = {1, 3, 5, 7}; |
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| 141 | struct stats stats; |
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| 142 | struct test_result * res; |
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| 143 | int i; |
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| 144 | |
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| 145 | analyze(&stats, state); |
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| 146 | |
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| 147 | // step 0: try to win. |
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| 148 | for (i = 0; i < 9; i++) { |
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| 149 | res = &(stats.results[i]); |
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| 150 | if ( res->score_computer == 2 && res->free != -1 ) { |
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| 151 | if ( try_put(state, res->free, _COMPUTER) == 0 ) |
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| 152 | return; |
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| 153 | } |
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| 154 | } |
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| 155 | |
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| 156 | // step 1: block winning |
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| 157 | for (i = 0; i < 9; i++) { |
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| 158 | res = &(stats.results[i]); |
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| 159 | if ( res->score_player == 2 && res->free != -1 ) { |
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| 160 | if ( try_put(state, res->free, _COMPUTER) == 0 ) |
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| 161 | return; |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | // step 2: fork |
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| 166 | // TODO: implement |
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| 167 | |
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| 168 | // step 3: block forking |
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| 169 | // TODO: implement |
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| 170 | |
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| 171 | // step 4: play center |
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| 172 | if ( try_put(state, 4, _COMPUTER) == 0 ) |
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| 173 | return; |
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| 174 | |
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| 175 | // step 5: "Opposite corner" |
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| 176 | for (i = 0; i < 4; i++) |
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| 177 | if ( player_move == corner[i] ) |
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| 178 | if ( try_put(state, 8 - player_move, _COMPUTER) == 0 ) |
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| 179 | return; |
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| 180 | |
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| 181 | // step 6: Empty corner |
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| 182 | for (i = 0; i < 4; i++) |
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| 183 | if ( try_put(state, corner[i], _COMPUTER) == 0 ) |
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| 184 | return; |
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| 185 | |
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| 186 | // step 7: Empty side |
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| 187 | for (i = 0; i < 4; i++) |
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| 188 | if ( try_put(state, side[i], _COMPUTER) == 0 ) |
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| 189 | return; |
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| 190 | } |
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| 191 | |
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| 192 | static void draw_game(int client, game_state * state, const char * info) { |
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| 193 | struct roar_buffer * buf; |
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| 194 | ssize_t len = 0; |
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| 195 | void * data; |
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| 196 | |
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| 197 | if ( roar_buffer_new_data(&buf, _DISPLAY_BUFFER_LEN, &data) == -1 ) |
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| 198 | return; |
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| 199 | |
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| 200 | snprintf(data, _DISPLAY_BUFFER_LEN, _DISPLAY, |
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| 201 | (*state)[0], (*state)[1], (*state)[2], |
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| 202 | (*state)[3], (*state)[4], (*state)[5], |
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| 203 | (*state)[6], (*state)[7], (*state)[8], |
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| 204 | info); |
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| 205 | |
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| 206 | len = roar_mm_strlen(data); |
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| 207 | |
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| 208 | if ( roar_buffer_set_len(buf, len) == -1 ) { |
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| 209 | roar_buffer_free(buf); |
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| 210 | clients_delete(client); |
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| 211 | } |
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| 212 | |
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| 213 | clients_add_output(client, &buf); |
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| 214 | } |
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| 215 | |
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| 216 | int new_client(int client, struct roar_vio_calls * vio, struct roard_listen * lsock) { |
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| 217 | struct roar_client_server * cs; |
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| 218 | game_state * state; |
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| 219 | |
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| 220 | (void)vio, (void)lsock; |
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| 221 | |
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| 222 | if ( clients_get_server(client, &cs) == -1 ) |
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| 223 | return -1; |
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| 224 | |
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| 225 | state = roar_mm_malloc(sizeof(game_state)); |
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| 226 | if ( state == NULL ) |
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| 227 | return -1; |
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| 228 | |
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| 229 | new_game(state); |
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| 230 | |
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| 231 | cs->protoinst = state; |
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| 232 | |
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| 233 | draw_game(client, state, MSG__YOUR_TURN); |
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| 234 | return 0; |
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| 235 | } |
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| 236 | |
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[5454] | 237 | static char input2id(char c) { |
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| 238 | if ( c > '9' ) |
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| 239 | return c; |
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| 240 | if ( c >= '7' ) |
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| 241 | return c - 7; |
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| 242 | if ( c >= '4' ) |
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| 243 | return c - 1; |
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| 244 | if ( c >= '1' ) |
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| 245 | return c + 5; |
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| 246 | return c; |
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| 247 | } |
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| 248 | |
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[5449] | 249 | static int check_client(int client, struct roar_vio_calls * vio) { |
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| 250 | struct roar_client_server * cs; |
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| 251 | char buf[32]; |
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| 252 | ssize_t len; |
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| 253 | ssize_t i; |
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| 254 | const char * msg = MSG__YOUR_TURN; |
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| 255 | char won; |
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| 256 | int player_move = -1; |
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[5454] | 257 | char c; |
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[5449] | 258 | |
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| 259 | ROAR_DBG("check_client(client=%i, vio=%p) = ?", client, vio); |
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| 260 | |
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| 261 | if ( clients_get_server(client, &cs) == -1 ) |
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| 262 | return -1; |
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| 263 | |
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| 264 | len = roar_vio_read(vio, buf, sizeof(buf)); |
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| 265 | |
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| 266 | if ( len < 1 ) { |
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| 267 | clients_delete(client); |
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| 268 | return -1; |
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| 269 | } |
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| 270 | |
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| 271 | if ( check_won(cs->protoinst) ) { |
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| 272 | for (i = 0; i < len; i++) { |
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| 273 | if ( buf[i] == 'q' ) { |
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| 274 | clients_delete(client); |
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| 275 | return -1; |
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| 276 | } else { |
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| 277 | new_game(cs->protoinst); |
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| 278 | draw_game(client, cs->protoinst, MSG__YOUR_TURN); |
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| 279 | return 0; |
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| 280 | } |
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| 281 | } |
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| 282 | } |
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| 283 | |
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| 284 | for (i = 0; i < len; i++) { |
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[5454] | 285 | c = input2id(buf[i]); |
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| 286 | switch (c) { |
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[5449] | 287 | case 'q': |
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| 288 | clients_delete(client); |
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| 289 | return -1; |
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| 290 | break; |
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| 291 | case '0': case '1': case '2': case '3': case '4': |
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| 292 | case '5': case '6': case '7': case '8': |
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[5454] | 293 | if ( try_put(cs->protoinst, c - '0', _PLAYER) == -1 ) { |
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[5449] | 294 | msg = MSG__CANNOT_PUT_HERE; |
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| 295 | draw_game(client, cs->protoinst, msg); |
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| 296 | return 0; |
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| 297 | } else { |
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| 298 | msg = MSG__YOUR_TURN; |
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| 299 | i = len; // end the loop. |
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[5454] | 300 | player_move = c - '0'; |
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[5449] | 301 | } |
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| 302 | break; |
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| 303 | } |
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| 304 | } |
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| 305 | |
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| 306 | won = check_won(cs->protoinst); |
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| 307 | |
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| 308 | if ( !won && player_move != -1 ) { |
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| 309 | auto_move(cs->protoinst, player_move); |
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| 310 | won = check_won(cs->protoinst); |
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| 311 | } |
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| 312 | |
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| 313 | switch (won) { |
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| 314 | case _PLAYER: msg = MSG__WON_PLAYER; break; |
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| 315 | case _COMPUTER: msg = MSG__WON_COMPUTER; break; |
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| 316 | case _NOBODY: msg = MSG__WON_NOBODY; break; |
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| 317 | } |
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| 318 | |
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| 319 | draw_game(client, cs->protoinst, msg); |
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| 320 | |
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| 321 | ROAR_DBG("check_client(client=%i, vio=%p) = 0", client, vio); |
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| 322 | return 0; |
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| 323 | } |
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| 324 | |
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| 325 | |
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| 326 | static struct roard_proto proto[1] = { |
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| 327 | {ROAR_PROTO_GAME, ROAR_SUBSYS_NONE, "Simple Tic-Tac-Toe game", NULL, new_client, NULL, check_client, NULL, NULL} |
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| 328 | }; |
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| 329 | |
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| 330 | ROARD_DL_REG_PROTO(proto) |
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| 331 | |
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| 332 | ROAR_DL_PLUGIN_START(protocol_tic_tac_toe) { |
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| 333 | ROARD_DL_CHECK_VERSIONS(); |
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| 334 | |
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| 335 | ROAR_DL_PLUGIN_META_PRODUCT_NIV("protocol-tic-tac-toe", ROAR_VID_ROARAUDIO, ROAR_VNAME_ROARAUDIO); |
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| 336 | ROAR_DL_PLUGIN_META_VERSION(ROAR_VERSION_STRING); |
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| 337 | ROAR_DL_PLUGIN_META_LICENSE_TAG(GPLv3_0); |
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| 338 | ROAR_DL_PLUGIN_META_CONTACT_FLNE("Philipp", "Schafft", "ph3-der-loewe", "lion@lion.leolix.org"); |
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| 339 | ROAR_DL_PLUGIN_META_DESC("Implementation of a the well known game Tic-Tac-Toe"); |
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| 340 | |
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| 341 | ROARD_DL_REGFN_PROTO(); |
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| 342 | } ROAR_DL_PLUGIN_END |
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| 343 | |
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| 344 | //ll |
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