Initial commit of library code, moved from leaftest repo

git-svn-id: https://leaflabs.googlecode.com/svn/trunk/library@69 749a229e-a60e-11de-b98f-4500b42dc123

1 files changed, 38 insertions, 0 deletions

diff --git a/src/wiring/math.cpp b/src/wiring/math.cpp
new file mode 100644
index 0000000..9be7dc3
--- /dev/null
+++ b/src/wiring/math.cpp
@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include "math.h"
+
+/* from newlib:
+ *
+ * rand returns the next pseudo-random integer in sequence; it is a number 
+ *      between 0 and RAND_MAX (inclusive).
+ *
+ * srand does not return a result. */
+
+
+/* The rest copied from WMath.cpp  */
+void randomSeed(unsigned int seed) {
+  if (seed != 0) {
+    srand(seed);
+  }
+}
+
+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;
+}
+
+long map(long x, long in_min, long in_max, long out_min, long out_max) {
+  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+
+