Add a utility header to convert error codes.

src/libabacus_util.c

@@ -0,0 +1,20 @@
+#include "libabacus_util.h"
+
+libab_result convert_lex_result(liblex_result to_convert) {
+    libab_result result = LIBAB_SUCCESS;
+    if(to_convert == LIBLEX_MALLOC) {
+        result = LIBAB_MALLOC;
+    } else if(to_convert == LIBLEX_INVALID) {
+        result = LIBAB_BAD_PATTERN;
+    } else if(to_convert == LIBLEX_UNRECOGNIZED) {
+        result = LIBAB_FAILED_MATCH;
+    }
+    return result;
+}
+libab_result convert_ds_result(libds_result to_convert) {
+    libab_result result = LIBAB_SUCCESS;
+    if(to_convert == LIBDS_MALLOC) {
+        result = LIBAB_MALLOC;
+    }
+    return result;
+}