added basic legal moves for pieces

legal_move.c

+/* Move generation */
+
+
+
+int  legal_move(int sq, int side){
+	
+	if(!side) // white side
+	{
+		// moving pawns
+		if( (sq+17 & 0x88)==0 && board[sq+17] == P )
+		{
+			return 1;
+		
+		}
+		
+		if( (sq+15 & 0x88)==0 && board[sq+15] == P )
+		{
+			return 1;
+		
+		}
+	}
+		
+	else{
+	
+		if( (sq-17 & 0x88)==0 && board[sq-17] == p )
+		{
+			return 1;
+		
+		}
+			
+		if( (sq-15 & 0x88)==0 && board[sq-15] == p )
+		{
+			return 1;
+		
+		}
+	
+	}	
+	// moving knights
+	for (int i = 0; i < 8; i++)
+    	{
+	
+		int target_square = sq + moves_knight[i];
+		int target_piece = board[target_square];
+		
+		if (!(target_square & 0x88))
+		{
+		    if (!side ? target_piece == N : target_piece == n)
+			return 1;
+		} 
+	}	
+	
+
+	// moving bishop
+	for (int i = 0; i < 4; i++)
+    	{
+        
+		int target_square = sq + moves_bishop[i];
+		while (!(target_square & 0x88))
+		{
+		    int target_piece = board[target_square];
+		    
+		   
+		    if (!side ? (target_piece == B || target_piece == Q) : (target_piece == b || target_piece == q))
+		        return 1;
+
+		    
+		    if (target_piece)
+		        break;
+		    target_square += moves_bishop[i];
+		}
+       }
+       // Moving king
+       	 for (int i = 0; i < 8; i++)
+	{
+		int target_square = sq + moves_king[i];
+
+		int target_piece = board[target_square];
+
+		if (!(target_square & 0x88))
+		{
+		    if (!side ? target_piece == K : target_piece == k)
+			return 1;
+		} 
+	}
+	// moving the queen and the rook
+	    for (int i = 0; i < 4; i++)
+	    {
+		int target_square = sq + moves_rook[i];		
+		while (!(target_square & 0x88))
+		{
+		    int target_piece = board[target_square];
+		    if (!side ? (target_piece == R || target_piece == Q) : (target_piece == r || target_piece == q))
+		        return 1;
+
+		    if (target_piece)
+		        break;
+		
+		    target_square += moves_rook[i];
+		}
+    
+  	 }
+  	 return 0;
+
+}
+
+
+void print_possible_moves(int side){
+
+	for(int i = 0 ; i<8 ; i++){//loop over the ranks
+		for(int j=0;j<16;j++ ){// loop over the files
+			int square = 16 * i + j; 
+			if(j == 0){
+				printf("%d   " , 8-i); // print ranks
+			}
+			
+			// print the board's valid quares
+			if(!(square & 0x88)){
+
+				printf(" %c " ,legal_move(square,side) ? 'x' : '.');
+			}
+		}
+		printf("\n");
+	}
+	printf("\n     a  b  c  d  e  f  g  h \n\n\n"); // print files
+
+
+}