zobristTableGet

src/common/preCodeGen/util.c

@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <chess/util.h>
 
@@ -20,3 +21,59 @@ uint_least8_t getFile(const uint_least8_t field) {
 uint_least8_t getRank(const uint_least8_t field) {
 	return field / BOARD_SIZE;
 }
+
+void initZobirstTable(struct zobristTableElement *table, size_t length) {
+	for(size_t i = 0; i < length; ++i) {
+		table[i].hash = 0; // use 0 for no value
+	}
+}
+
+static size_t zobristTableInitialI(const struct zobristTable table, const uint_least64_t key) {
+	return key % table.length;
+}
+
+enum returnStatus {
+	CONTINUE,
+	RETURN,
+};
+
+static void zobristTableIter(const struct zobristTable table, const uint_least64_t key, void *result,
+		enum returnStatus (*foreach)(const struct zobristTableElement element, const uint_least64_t key, void *result)) {
+	const size_t initI = zobristTableInitialI(table, key);
+	size_t i = initI;
+	do {
+		const struct zobristTableElement element = table.arr[i];
+		if(foreach(element, key, result) == RETURN) return;
+		++i;
+		if(i >= table.length) i = 0;
+	} while(i != initI);
+	fprintf(stderr, "Error: zobrist table is full");
+	exit(1);
+}
+
+static enum returnStatus zobristTableGetForeach(const struct zobristTableElement element, const uint_least64_t key,
+		void *resultVoid) {
+	struct zobristTableResult *result = resultVoid;
+	if(element.hash == key) {
+		*result = (struct zobristTableResult){true, element.value};
+		return RETURN;
+	}
+	if(element.hash == 0) {
+		result->success = false;
+		return RETURN;
+	}
+	return CONTINUE;
+}
+
+struct zobristTableResult zobristTableGet(const struct zobristTable table, const uint_least64_t key) {
+	struct zobristTableResult result;
+	zobristTableIter(table, key, &result, zobristTableGetForeach);
+	return result;
+}
+
+static enum returnStatus zobristTableSetForeach(const struct zobristTableElement element, const uint_least64_t key,
+		void *resultVoid) {
+}
+
+void zobristTableSet(struct zobristTable table, const uint_least64_t key, const int_least16_t value) {
+}