CPW-Engine 0x88 math
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/* row identifiers */ #define ROW_1 ( A1 >> 4 ) #define ROW_2 ( A2 >> 4 ) #define ROW_3 ( A3 >> 4 ) #define ROW_4 ( A4 >> 4 ) #define ROW_5 ( A5 >> 4 ) #define ROW_6 ( A6 >> 4 ) #define ROW_7 ( A7 >> 4 ) #define ROW_8 ( A8 >> 4 ) /* column identifiers */ #define COL_A ( A1 & 7 ) #define COL_B ( B1 & 7 ) #define COL_C ( C1 & 7 ) #define COL_D ( D1 & 7 ) #define COL_E ( E1 & 7 ) #define COL_F ( F1 & 7 ) #define COL_G ( G1 & 7 ) #define COL_H ( H1 & 7 ) /* vectors */ #define NORTH 16 #define NN ( NORTH + NORTH ) #define SOUTH -16 #define SS ( SOUTH + SOUTH ) #define EAST 1 #define WEST -1 #define NE 17 #define SW -17 #define NW 15 #define SE -15 /* geberate square number from row and column */ #define SET_SQ(row,col) (row * 16 + col) /* does a given number represent a square on the board? */ #define IS_SQ(x) ( (x) & 0x88 ) ? (0) : (1) /* get board column that a square is part of */ #define COL(sq) ( (sq) & 7 ) /* get board row that a square is part of */ #define ROW(sq) ( (sq) >> 4 ) /* determine if two squares lie on the same column */ #define SAME_COL(sq1,sq2) ( ( COL(sq1) == COL(sq2) ) ? (1) : (0) ) /* determine if two squares lie in the same row */ #define SAME_ROW(sq1,sq2) ( ( ROW(sq1) == ROW(sq2) ) ? (1) : (0) )
