b2a2dc48de94edbae86b7f1d2f73f909b85e0740
kent
  Sat Apr 13 17:49:38 2013 -0700
Adding shuffleArrayOfChars library function.
diff --git src/lib/obscure.c src/lib/obscure.c
index 09f00b6..b1b60bc 100644
--- src/lib/obscure.c
+++ src/lib/obscure.c
@@ -575,30 +575,46 @@
 char *greek[] = {"B", "KB", "MB", "GB", "TB", "PB"};
 int i = 0;
 long long d = 1;
 while ((size/d) >= 1024)
     {
     ++i;
     d *= 1024;
     }
 double result = ((double)size)/d;
 if (result < 10)
     safef(s,slength,"%3.1f %s",((double)size)/d, greek[i]);
 else
     safef(s,slength,"%3.0f %s",((double)size)/d, greek[i]);
 }
 
+void shuffleArrayOfChars(char *array, int arraySize, int shuffleCount)
+/* Shuffle array of characters of given size given number of times. */
+{
+char c;
+int i, randIx;
+
+/* Randomly permute an array using the method from Cormen, et al */
+for (i=0; i<arraySize; ++i)
+    {
+    randIx = i + (rand() % (arraySize - i));
+    c = array[i];
+    array[i] = array[randIx];
+    array[randIx] = c;
+    }
+}
+
 
 void shuffleArrayOfPointers(void *pointerArray, int arraySize, int shuffleCount)
 /* Shuffle array of pointers of given size given number of times. */
 {
 void **array = pointerArray, *pt;
 int i, randIx;
 
 /* Randomly permute an array using the method from Cormen, et al */
 for (i=0; i<arraySize; ++i)
     {
     randIx = i + (rand() % (arraySize - i));
     pt = array[i];
     array[i] = array[randIx];
     array[randIx] = pt;
     }