1 files changed, 41 insertions, 0 deletions
diff --git a/nebu/base/util.c b/nebu/base/util.c
new file mode 100644
index 0000000..8c5c2ff
--- /dev/null
+++ b/nebu/base/util.c
@@ -0,0 +1,41 @@
+/* small utility functions */
+
+#include <stdlib.h>
+#include "base/nebu_random.h"
+#include "base/nebu_types.h"
+
+void randomPermutation( int N, int *nodes )
+{
+  int i;
+  for(i = 0; i < N; i++)
+    nodes[i] = i;
+
+  for(i = 0; i < N - 1; i++) {
+    int s, t;
+    int tmp;
+    t = N - 1 - i;
+    // s = (int) ((float)( t + 1 ) * trand() / (RAND_MAX + 1.0f));
+    s = trand() % (t + 1);
+    tmp = nodes[t];
+    nodes[t] = nodes[s];
+    nodes[s] = tmp;
+  }
+}
+
+void clamp( float *f, float min, float max )
+{
+  if(*f < min) *f = min;
+  else if(*f > max) *f = max;
+}
+
+void addList(List **l, void* data) {
+	List *p;
+	if(*l == NULL) {
+		*l = (List*) malloc(sizeof(List));
+		(*l)->next = NULL;
+	}
+	for(p = *l; p->next != NULL; p = p->next);
+	p->next = (List*) malloc(sizeof(List));
+	p->next->next = NULL;
+	p->data = data;
+}