1 files changed, 15 insertions, 1 deletions
diff --git a/src/include/taler_amount_lib.h b/src/include/taler_amount_lib.h
index a529cfb84..937238d15 100644
--- a/src/include/taler_amount_lib.h
+++ b/src/include/taler_amount_lib.h
@@ -18,6 +18,10 @@
  * @brief amount-representation utility functions
  * @author Sree Harsha Totakura <sreeharsha@totakura.in>
  */
+#if ! defined (__TALER_UTIL_LIB_H_INSIDE__)
+#error "Only <taler_util.h> can be included directly."
+#endif
+
 #ifndef TALER_AMOUNT_LIB_H
 #define TALER_AMOUNT_LIB_H
 
@@ -124,6 +128,16 @@ struct TALER_Amount
 
 
 /**
+ * Check that the currency code in @a str is well-formed.
+ *
+ * @param str currency code name to validate
+ * @return #GNUNET_OK if @a str is a valid currency code
+ */
+enum GNUNET_GenericReturnValue
+TALER_check_currency (const char *str);
+
+
+/**
  * Parse monetary amount, in the format "T:V.F".
  *
  * @param str amount string
@@ -398,7 +412,7 @@ TALER_amount_multiply (struct TALER_Amount *result,
  *         #GNUNET_NO if value was already normalized
  *         #GNUNET_SYSERR if value was invalid or could not be normalized
  */
-int
+enum GNUNET_GenericReturnValue
 TALER_amount_normalize (struct TALER_Amount *amount);