lib/othello.c

   1 /*
   2  * =====================================================================================
   3  *
   4  *       Filename:  othello.c
   5  *
   6  *    Description:  Handle the othello board content
   7  *
   8  *        Version:  1.0
   9  *        Created:  25/04/2017 15:16:08
  10  *       Revision:  none
  11  *       Compiler:  gcc
  12  *
  13  *         Author:  Jerome Benoit (fraggle), jerome.benoit@piment-noir.org
  14  *   Organization:  Piment Noir
  15  *
  16  * =====================================================================================
  17  */
  18
  19 #include <stdlib.h>
  20 #include <stdbool.h>
  21
  22 #include "othello.h"
  23
  24 unsigned int current_player(unsigned int round_count) {
  25
  26     if (round_count % 2 != 0) {
  27         return player_two;
  28     } else {
  29         return player_one;
  30     }
  31 }
  32
  33 /* for consitency with ncurses, the board coordinates are in the following order:
  34  * O-x-->
  35  * |
  36  * y
  37  * |
  38  * v
  39  * The origin O has (1, 1) coordinates */
  40
  41 unsigned int get_box_value(int y, int x, unsigned int pawn_array[board_size][board_size]) {
  42
  43     return pawn_array[y-1][x-1];
  44 }
  45
  46 bool is_box_type(int y, int x, unsigned int pawn_array[board_size][board_size], unsigned int type) {
  47
  48     if (type > 2) {
  49         return NULL;
  50     }
  51     if (get_box_value(y, x, pawn_array) == type) {
  52         return true;
  53     } else {
  54         return false;
  55     }
  56 }
  57
  58 /* helper function to set a value != empty at the (y, x) in the pawns array */
  59 int** set_pawn(int y, int x, unsigned int type, unsigned int pawn_array[board_size][board_size]) {
  60
  61     if (is_box_type(y, x, pawn_array, empty)) {
  62         pawn_array[y-1][x-1] = type;
  63         return pawn_array;
  64     } else {
  65         return NULL;
  66     }
  67 }
  68
  69 static int** zero_pawns(unsigned int pawn_array[board_size][board_size]) {
  70
  71     for (unsigned int i = 1; i <= board_size; i++) {
  72         for (unsigned int j = 1; j <= board_size; j++) {
  73             pawn_array = set_pawn(i, j, empty, pawn_array);
  74          }
  75     }
  76     return pawn_array;
  77 }
  78
  79 /* set the pawns in the start position */
  80 int** init_pawns(unsigned int pawn_array[board_size][board_size]) {
  81
  82     pawn_array = zero_pawns(pawn_array);
  83     pawn_array = set_pawn(5, 4, black, pawn_array);
  84     pawn_array = set_pawn(4, 5, black, pawn_array);
  85     pawn_array = set_pawn(4, 4, white, pawn_array);
  86     pawn_array = set_pawn(5, 5, white, pawn_array);
  87     return pawn_array;
  88 }
  89
  90 unsigned int count_pawn_type(unsigned int pawn_array[board_size][board_size], unsigned int type) {
  91     unsigned int count = 0;
  92
  93     if (type > 2) {
  94         return -1;
  95     }
  96     for (unsigned int i = 1; i <= board_size; i++) {
  97         for (unsigned int j = 1; j <= board_size; j++) {
  98             if (get_box_value(i, j, pawn_array) == type) {
  99                 count++;
 100             }
 101         }
 102     }
 103     return count;
 104 }
 105
 106 bool is_valid_input(int y, int x, unsigned int pawn_array[board_size][board_size]) {
 107
 108     /* FIXME: separate the tests to permit to print explicit error messages */
 109     if ((y > 0 && y < board_size + 1) && \
 110             (x > 0 && x < board_size + 1) && \
 111             is_box_type(y, x, pawn_array, empty)) {
 112         return true;
 113     } else {
 114         return false;
 115     }
 116 }
 117
 118 bool is_board_full(unsigned int pawn_array[board_size][board_size]) {
 119
 120     for (unsigned int i = 1; i <= board_size; i++) {
 121         for (unsigned int j = 1; j <= board_size; j++) {
 122             if (is_box_type(i, j, pawn_array , empty)) {
 123                 return false;
 124             }
 125         }
 126     }
 127     return true;
 128 }
 129
 130 void status_pawn(int y, int x, unsigned int pawn_array[board_size][board_size]) {
 131
 132 }
 133
 134 bool is_legal_box(int y, int x, int player, unsigned int pawn_array[board_size][board_size]) {
 135
 136 }
 137
 138 bool reverse_box(unsigned int pawn_array[board_size][board_size]) {
 139
 140 }