diff --git a/include/rawrtcc/utils.h b/include/rawrtcc/utils.h
new file mode 100644
index 0000000..8c798eb
--- /dev/null
+++ b/include/rawrtcc/utils.h
@@ -0,0 +1,19 @@
+#pragma once
+#include "code.h"
+
+/// Translate a rawrtc return code to a string.
+char const* rawrtc_code_to_str(enum rawrtc_code const code);
+
+/// Translate an re error to a rawrtc code.
+enum rawrtc_code rawrtc_error_to_code(const int code);
+
+/// Duplicate a string.
+/// `*destinationp` will be set to a copy of `source` and must be
+/// unreferenced.
+enum rawrtc_code rawrtc_strdup(
+    char** const destinationp,  // de-referenced
+    char const* const source);
+
+/// Print a formatted string to a dynamically allocated buffer.
+/// `*destinationp` must be unreferenced.
+enum rawrtc_code rawrtc_sdprintf(char** const destinationp, char* const formatter, ...);