8 files changed, 140 insertions, 1 deletions
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a9067ca..a82103b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,6 +1,11 @@
 project(kalmia)
 
-target_sources(kalmia PUBLIC transform.c)
+target_sources(
+	kalmia PUBLIC 
+	transform.c
+	node.c
+	util.c
+)
 target_include_directories(kalmia PUBLIC ezxml)
 target_link_libraries(kalmia ezxml)
 
@@ -13,5 +18,7 @@ if (KALMIA_BUILD_TESTS)
 		test/test.c
 
 		transform.test.c
+		node.test.c
+		util.test.c
 	)
 endif()
diff --git a/src/node.c b/src/node.c
new file mode 100644
index 0000000..1ba862d
--- /dev/null
+++ b/src/node.c
@@ -0,0 +1,5 @@
+#include <kalmia.h>
+#include <ezxml.h>
+#include "node.h"
+
+
diff --git a/src/node.h b/src/node.h
new file mode 100644
index 0000000..ea0bedf
--- /dev/null
+++ b/src/node.h
@@ -0,0 +1,9 @@
+#ifndef KALMIA_NODE_H
+#define KALMIA_NODE_H
+
+#include <kalmia.h>
+#include <ezxml.h>
+
+
+
+#endif
diff --git a/src/node.test.c b/src/node.test.c
new file mode 100644
index 0000000..236d200
--- /dev/null
+++ b/src/node.test.c
@@ -0,0 +1,8 @@
+#include <kalmia.h>
+#include <ezxml.h>
+#include "test/test.h"
+
+
+void suite_node()
+{
+}
diff --git a/src/test/test.h b/src/test/test.h
index 17731b9..881384e 100644
--- a/src/test/test.h
+++ b/src/test/test.h
@@ -5,11 +5,15 @@
 
 
 void suite_transform();
+void suite_node();
+void suite_util();
 
 
 #define RUN_TESTS() \
 	do { \
 		lily_run_suite(suite_transform); \
+		lily_run_suite(suite_node); \
+		lily_run_suite(suite_util); \
 	} while (0)
 
 #endif
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..7b8120b
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,39 @@
+#include <stdlib.h>
+
+#include <kalmia.h>
+#include "util.h"
+
+void * kai_next_array_element(void **array, size_t *count, size_t *max, size_t sz)
+{
+	void *array_new = NULL;
+	if (*max == 0) {
+		array_new = malloc(sz);
+		*count = 1;
+		*max = 1;
+	}
+	else if (*count == *max) {
+		array_new = realloc(*array, 2*(*max)*sz);
+		*count += 1;
+		*max *= 2;
+	}
+	else {
+		array_new = *array;
+		*count += 1;
+	}
+
+	if (array_new == NULL)
+		return NULL;
+	
+	*array = array_new;
+	return array_new + ((*count-1) * sz);
+}
+
+
+ka_node_t * kai_next_node(kalmia_t *k)
+{
+	return kai_next_array_element(
+		(void**) &(k->node), 
+		&(k->n_nodes), &(k->n_nodes_max), 
+		sizeof(ka_node_t)
+	);
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..7cf72bf
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,10 @@
+#ifndef KALMIA_UTIL_H
+#define KALMIA_UTIL_H
+
+#include <kalmia.h>
+
+void * kai_next_array_element(void **array, size_t *count, size_t *max, size_t sz);
+
+ka_node_t * kai_next_node(kalmia_t *k);
+
+#endif
diff --git a/src/util.test.c b/src/util.test.c
new file mode 100644
index 0000000..c2f8462
--- /dev/null
+++ b/src/util.test.c
@@ -0,0 +1,57 @@
+#include <stdlib.h>
+
+#include <kalmia.h>
+#include "util.h"
+#include "test/test.h"
+
+void next_array_element();
+
+void suite_util()
+{
+	lily_run_test(next_array_element);
+}
+
+void next_array_element()
+{
+	int *arr = NULL;
+	size_t count = 0;
+	size_t max = 0;
+
+	int *next = kai_next_array_element((void**) &arr, &count, &max, sizeof(int));
+	lily_assert_not_null(arr);
+	lily_assert_not_null(next);
+
+	lily_assert_ptr_equal(arr+0, next);
+	lily_assert_int_equal(count, 1);
+	lily_assert_int_equal(max, 1);
+	*next = 2;
+
+	next = kai_next_array_element((void**) &arr, &count, &max, sizeof(int));
+
+	lily_assert_not_null(next);
+	lily_assert_ptr_equal(arr+1, next);
+	lily_assert_int_equal(count, 2);
+	lily_assert_int_equal(max, 2);
+	*next = 1;
+
+	next = kai_next_array_element((void**) &arr, &count, &max, sizeof(int));
+
+	lily_assert_not_null(next);
+	lily_assert_ptr_equal(arr+2, next);
+	lily_assert_int_equal(count, 3);
+	lily_assert_int_equal(max, 4);
+	*next = 3;
+
+	next = kai_next_array_element((void**) &arr, &count, &max, sizeof(int));
+
+	lily_assert_not_null(next);
+	lily_assert_ptr_equal(arr+3, next);
+	lily_assert_int_equal(count, 4);
+	lily_assert_int_equal(max, 4);
+	*next = 4;
+
+	int expected[] = { 2, 1, 3, 4 };
+	lily_assert_memory_equal(expected, arr, 4 * sizeof(int));
+
+	free(arr);
+}