WIP refactor

util.c

@@ -0,0 +1,82 @@
+
+#include "util.h"
+
+/**
+ * Returns the absolute value of an index_t value
+ *
+ * \param p positive or negative index_t
+ */
+index_t abs_pos(index_t p)
+{
+    if (p < 0)
+        return -1 * p;
+
+    return p;
+}
+
+/**
+ * Returns the absolute value of a tile_t value
+ *
+ * \param t positive or negative tile_t
+ * */
+tile_t abs_tile(tile_t t)
+{
+    if (t < 0)
+        return -1 * t;
+
+    return t;
+}
+
+/**
+ * Returns true if tile is empty, false otherwise
+ *
+ *	\param t tile to check if empty
+ * */
+bool tile_empty(tile_t t)
+{
+    return t == E;
+}
+
+/**
+ * Returns row number of 1D board index
+ *
+ * \param i index to get row number of
+ * */
+index_t row(index_t i)
+{
+    return i / ROW;
+}
+
+/**
+ * Returns column number of board index
+ *
+ * \param i index to get column number of
+ * */
+index_t column(index_t i)
+{
+    return i % ROW;
+}
+
+/**
+ * Returns true if a and b are tiles of opposite color, false otherwise
+ *
+ * \param a Tile to compare
+ * \param b Tile to compare it with
+ * */
+bool opposite_color(tile_t a, tile_t b)
+{
+    return a * b < 0;
+}
+
+/**
+ * Returns true if a and b are pieces of the same color, false otherwise
+ *
+ * \param a Tile to compare
+ * \param b Tile to compare it with
+ * */
+bool same_color(tile_t a, tile_t b)
+{
+    return a * b > 0;
+}
+
+