Write own rng

inkcpp/random.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "../shared/public/system.h"
+
+namespace ink::runtime::internal {
+	/**
+	 * @brief pseudo random number generator based on Linear Congruential Generator.
+	 */
+	class prng {
+		static constexpr uint32_t C = 12345;
+		static constexpr uint32_t A = 1103515245;
+		static constexpr uint32_t M = 1<<31;
+	public:
+		void srand(int32_t seed) {
+			_x = seed;
+		}
+		uint32_t rand() {
+			_x = (A*_x+ C) % M;
+			return _x;
+		}
+		int32_t rand(int32_t max) {
+			uint64_t prod = rand();
+			prod *= max;
+			return static_cast<int32_t>(prod / M);
+		}
+	private:
+		uint32_t _x = 1337;
+	};
+}

inkcpp/runner_impl.cpp

@@ -929,13 +929,13 @@ namespace ink::runtime::internal
 				int sequenceLength = _eval.pop();
 				int index = _eval.pop();
 
-				_eval.push(rand() % sequenceLength); // TODO: platform independance?
+				_eval.push(_rng.rand(sequenceLength));
 			} break;
 			case Command::SEED:
 			{
 				// TODO: Platform independance
-				int seed = _eval.pop();
-				srand(seed);
+				int32_t seed = _eval.pop();
+				_rng.srand(seed);
 
 				// push void (TODO)
 				_eval.push(0);

inkcpp/runner_impl.h

@@ -11,6 +11,7 @@
 #include "functions.h"
 #include "string_table.h"
 #include "array.h"
+#include "random.h"
 
 #include "runner.h"
 #include "choice.h"
@@ -163,6 +164,8 @@ namespace ink::runtime::internal
 		bool _is_falling = false;
 
 		bool _saved = false;
+
+		prng _rng{};
 	};
 
 	template<>

inkcpp/value.cpp

@@ -2,9 +2,6 @@
 #include "output.h"
 #include "string_table.h"
 
-// TODO
-#include <cstdlib>
-
 namespace ink
 {
 	namespace runtime