1 files changed, 30 insertions, 0 deletions
diff --git a/test/raytracer/arrays.c b/test/raytracer/arrays.c
new file mode 100644
index 0000000..43508ee
--- /dev/null
+++ b/test/raytracer/arrays.c
@@ -0,0 +1,30 @@
+#include "config.h"
+#include "arrays.h"
+
+struct array * alloc_array(int eltsize, int initialsize)
+{
+  struct array * a = arena_alloc(sizeof(struct array));
+  a->size = 0;
+  a->capacity = initialsize;
+  a->data = arena_alloc(eltsize * initialsize);
+  return a;
+}
+
+void grow_array(int eltsize, struct array * arr)
+{
+  void * newdata = arena_alloc(arr->capacity * 2 * eltsize);
+  memcpy(newdata, arr->data, arr->size * eltsize);
+  arr->data = newdata;
+  arr->capacity *= 2;
+}
+
+struct array * copy_array(int eltsize, struct array * arr, int extrasize)
+{
+  struct array * a = arena_alloc(sizeof(struct array));
+  a->size = arr->size;
+  a->capacity = arr->size + extrasize;
+  a->data = arena_alloc(eltsize * a->capacity);
+  memcpy(a->data, arr->data, eltsize * a->size);
+  return a;
+}
+