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diff --git a/src/client/array_append.h b/src/client/array_append.h
new file mode 100644
index 0000000..b7cc7ef
--- /dev/null
+++ b/src/client/array_append.h
@@ -0,0 +1,23 @@
+/* src/client/array_append.h
+ *
+ * Small memory management helper.
+ */
+
+#ifndef ARRAY_APPEND_H
+#define ARRAY_APPEND_H
+
+#include <stddef.h> /* size_t */
+#include <stdint.h> /* uint32_t */
+
+
+
+/* Append to array pointed to by "ptr_old_array" of "old_n" elements of
+ * "region_size" "new region".
+ */
+extern void array_append(uint32_t old_n, size_t region_size, void * new_region,
+                         void ** ptr_old_array);
+
+
+
+#endif
+