From 985c3a51725b11d00d65ea2abef05c3fb7cb3ab8 Mon Sep 17 00:00:00 2001
From: William Woodall <william@osrfoundation.org>
Date: Tue, 21 Apr 2015 20:18:22 -0700
Subject: [PATCH] fix handling of COM ports over 10 on Windows, fixes #84

---
 src/impl/win.cc | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/impl/win.cc b/src/impl/win.cc
index 545a773..7b1f1a6 100644
--- a/src/impl/win.cc
+++ b/src/impl/win.cc
@@ -20,6 +20,15 @@ using serial::SerialException;
 using serial::PortNotOpenedException;
 using serial::IOException;
 
+inline wstring
+_prefix_port_if_needed(const wstring &input)
+{
+  static wstring windows_com_port_prefix = L"\\\\.\\";
+  if (input.compare(windows_com_port_prefix) != 0)
+  {
+    return windows_com_port_prefix + input;
+  }
+}
 
 Serial::SerialImpl::SerialImpl (const string &port, unsigned long baudrate,
                                 bytesize_t bytesize,
@@ -52,7 +61,9 @@ Serial::SerialImpl::open ()
     throw SerialException ("Serial port already open.");
   }
 
-  LPCWSTR lp_port = port_.c_str();
+  // See: https://github.com/wjwwood/serial/issues/84
+  wstring port_with_prefix = _prefix_port_if_needed(port_);
+  LPCWSTR lp_port = port_with_prefix.c_str();
   fd_ = CreateFileW(lp_port,
                     GENERIC_READ | GENERIC_WRITE,
                     0,