From 35193272f00f69b81b37c99974a38167f51d5cbf Mon Sep 17 00:00:00 2001
From: Scott Duensing <scott@kangaroopunch.com>
Date: Fri, 2 Aug 2019 17:54:43 -0500
Subject: [PATCH] Added jlUtilRandom() and friends.

---
 joeylib/src/joey.c | 17 +++++++++++++++++
 joeylib/src/joey.h |  9 +++++++++
 2 files changed, 26 insertions(+)

diff --git a/joeylib/src/joey.c b/joeylib/src/joey.c
index 76e72bf..360572c 100644
--- a/joeylib/src/joey.c
+++ b/joeylib/src/joey.c
@@ -70,6 +70,7 @@ char  _jlTempString[1024];                   // Used internally for pathname ope
 static jlColorT       _jlDefaultPalette[16];
 static jlStackT      *_jlFillStackTop       = NULL;
 static byte           _jlDrawFillColor      = 0;
+static juint32        _jlSeed               = 0;
 
 
 void          _jlDrawCircleClipped(jint16 x0, jint16 y0, jint16 radius);
@@ -610,6 +611,22 @@ char *jlUtilMakePathname(char *filename, char *extension) {
 }
 
 
+juint16 jlUtilRandom(void) {
+	_jlSeed = _jlSeed * 1103515245 + 12345;
+	return _jlSeed / 65536;
+}
+
+
+juint32 jlUtilRandomSeedGet(void) {
+	return _jlSeed;
+}
+
+
+void jlUtilRandomSeedSet(juint32 seed) {
+	_jlSeed = seed;
+}
+
+
 void *_jlUtilStackPop(jlStackT **stack) {
 	void *d = NULL;
 	jlStackT *s;
diff --git a/joeylib/src/joey.h b/joeylib/src/joey.h
index b7b8220..5b4d74b 100644
--- a/joeylib/src/joey.h
+++ b/joeylib/src/joey.h
@@ -29,6 +29,12 @@
 #include <limits.h>
 
 
+#define JINT16_MIN   -32768
+#define JINT16_MAX    32767
+#define JUINT16_MIN       0
+#define JUINT16_MAX   65535
+
+
 // Determine platform and settings
 #ifdef __linux__
 
@@ -272,6 +278,9 @@ void          jlUtilIdle(void);
 char         *jlUtilMakePathname(char *filename, char *extension);
 bool          jlUtilMustExit(void);
 void          jlUtilNibbleSwap(byte *mem, jint16 count, byte old, byte new);
+juint16       jlUtilRandom(void);
+juint32       jlUtilRandomSeedGet(void);
+void          jlUtilRandomSeedSet(juint32 seed);
 void          jlUtilShutdown(void) __attribute__((noreturn));
 #define       jlUtilStackPop(stack) _jlUtilStackPop((jlStackT **)&(stack))  // Syntatic Sugar
 void        *_jlUtilStackPop(jlStackT **stack);