lots of stuff

src/utils.c

@@ -8,6 +8,29 @@
 
 #include "utils.h"
 
+void sorta_shuffle(void *arr, size_t n, size_t size, size_t sections)
+{
+    size_t i;
+    for(i = 0; i < sections; ++i){
+        size_t start = n*i/sections;
+        size_t end = n*(i+1)/sections;
+        size_t num = end-start;
+        shuffle(arr+(start*size), num, size);
+    }
+}
+
+void shuffle(void *arr, size_t n, size_t size)
+{
+    size_t i;
+    void *swp = calloc(1, size);
+    for(i = 0; i < n-1; ++i){
+        size_t j = i + rand()/(RAND_MAX / (n-i)+1);
+        memcpy(swp,          arr+(j*size), size);
+        memcpy(arr+(j*size), arr+(i*size), size);
+        memcpy(arr+(i*size), swp,          size);
+    }
+}
+
 void del_arg(int argc, char **argv, int index)
 {
     int i;