more documenting, checking for consistency between prepared statements and functional logic

1 files changed, 37 insertions, 0 deletions

diff --git a/src/util/amount.c b/src/util/amount.c
index 74ffcd36f..20b8618df 100644
--- a/src/util/amount.c
+++ b/src/util/amount.c
@@ -238,6 +238,20 @@ test_valid (const struct TALER_Amount *a)
 
 
 /**
+ * Test if @a a is valid, NBO variant.
+ *
+ * @param a amount to test
+ * @return #GNUNET_YES if valid,
+ *         #GNUNET_NO if invalid
+ */
+static int
+test_valid_nbo (const struct TALER_AmountNBO *a)
+{
+  return ('\0' != a->currency[0]);
+}
+
+
+/**
  * Test if @a a1 and @a a2 are the same currency.
  *
  * @param a1 amount to test
@@ -261,6 +275,29 @@ TALER_amount_cmp_currency (const struct TALER_Amount *a1,
 
 
 /**
+ * Test if @a a1 and @a a2 are the same currency, NBO variant.
+ *
+ * @param a1 amount to test
+ * @param a2 amount to test
+ * @return #GNUNET_YES if @a a1 and @a a2 are the same currency
+ *         #GNUNET_NO if the currencies are different,
+ *         #GNUNET_SYSERR if either amount is invalid
+ */
+int
+TALER_amount_cmp_currency_nbo (const struct TALER_AmountNBO *a1,
+                               const struct TALER_AmountNBO *a2)
+{
+  if ( (GNUNET_NO == test_valid_nbo (a1)) ||
+       (GNUNET_NO == test_valid_nbo (a2)) )
+    return GNUNET_SYSERR;
+  if (0 == strcasecmp (a1->currency,
+		       a2->currency))
+    return GNUNET_YES;
+  return GNUNET_NO;
+}
+
+
+/**
  * Compare the value/fraction of two amounts.  Does not compare the currency.
  * Comparing amounts of different currencies will cause the program to abort().
  * If unsure, check with #TALER_amount_cmp_currency() first to be sure that