add implementation for random/randomSeed

Author: wxyyy0117

api/WMath.cpp

@@ -0,0 +1,59 @@
+/*
+  Copyright (c) 2011 Arduino.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+//****************************************************************************
+// @Project Includes
+//****************************************************************************
+extern "C" {
+#include "stdlib.h"
+#include "stdint.h"
+}
+
+
+
+//****************************************************************************
+// @Local Functions
+//****************************************************************************
+
+void randomSeed(uint32_t dwSeed) {
+    if (dwSeed != 0) {
+        srand(dwSeed);
+    }
+}
+
+long random(long howbig) {
+    if (howbig == 0) {
+        return 0;
+    }
+
+    return rand() % howbig;
+}
+
+long random(long howsmall, long howbig) {
+    if (howsmall >= howbig) {
+        return howsmall;
+    }
+
+    long diff = howbig - howsmall;
+
+    return random(diff) + howsmall;
+}
+
+//****************************************************************************
+//                                 END OF FILE
+//****************************************************************************