From 26537a2dec68c3be9d597ae903dc0ffde7d1a599 Mon Sep 17 00:00:00 2001
From: Eric Schott <eric@morningjoy.com>
Date: Fri, 21 Jul 2017 11:56:07 +0200
Subject: [PATCH] C++ API: Correct the purge Direction and ModemCtl enumerations definitions

Do not use value of zero for bitmasks. The new enumeration values
are defined so programs compiled with the old ftdi.hpp include
would work as previously (doing nothing when the enumeration
with the zero value was bit-or'ed into the argument).
---
 ftdipp/ftdi.cpp |   24 +++++++++++++++++++-----
 ftdipp/ftdi.hpp |    8 ++++----
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/ftdipp/ftdi.cpp b/ftdipp/ftdi.cpp
index 8eb2ec2..bdd85f5 100644
--- a/ftdipp/ftdi.cpp
+++ b/ftdipp/ftdi.cpp
@@ -144,12 +144,26 @@ int Context::reset()
 
 int Context::flush(int mask)
 {
-    int ret = 1;
+    int ret;
 
-    if (mask & Input)
-        ret &= ftdi_usb_purge_rx_buffer(d->ftdi);
-    if (mask & Output)
-        ret &= ftdi_usb_purge_tx_buffer(d->ftdi);
+    switch (mask & (Input | Output)) {
+    case Input:
+        ret = ftdi_usb_purge_rx_buffer(d->ftdi);
+        break;
+
+    case Output:
+        ret = ftdi_usb_purge_tx_buffer(d->ftdi);
+        break;
+
+    case Input | Output:
+        ret = ftdi_usb_purge_buffers(d->ftdi);
+        break;
+
+    default:
+        // Emulate behavior of previous version.
+        ret = 1;
+        break;
+    }
 
     return ret;
 }
diff --git a/ftdipp/ftdi.hpp b/ftdipp/ftdi.hpp
index 4e3511d..2289a84 100644
--- a/ftdipp/ftdi.hpp
+++ b/ftdipp/ftdi.hpp
@@ -55,16 +55,16 @@ public:
      */
     enum Direction
     {
-        Input,
-        Output
+        Input = 0x2,
+        Output = 0x1,
     };
 
     /*! \brief Modem control flags.
      */
     enum ModemCtl
     {
-        Dtr,
-        Rts
+        Dtr = 0x2,
+        Rts = 0x1,
     };
 
     /* Constructor, Destructor */
-- 
1.7.1