From ab84639aaaaf8f29b3864cdf54db4667e1357473 Mon Sep 17 00:00:00 2001
From: V2Ray <admin@v2ray.com>
Date: Fri, 9 Oct 2015 16:48:05 +0200
Subject: [PATCH] prototype of platform specific code

---
 common/platform/others.go   | 16 ++++++++++++++++
 common/platform/platform.go | 10 ++++++++++
 common/platform/windows.go  | 17 +++++++++++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 common/platform/others.go
 create mode 100644 common/platform/platform.go
 create mode 100644 common/platform/windows.go

diff --git a/common/platform/others.go b/common/platform/others.go
new file mode 100644
index 00000000..a0d25a5e
--- /dev/null
+++ b/common/platform/others.go
@@ -0,0 +1,16 @@
+// +build !windows
+
+package platform
+
+import (
+	"os"
+)
+
+type otherPlatformEnvironment struct {
+}
+
+var environmentInstance = &otherPlatformEnvironment{}
+
+func (e *otherPlatformEnvironment) ExpandEnv(s string) string {
+	return os.ExpandEnv(s)
+}
diff --git a/common/platform/platform.go b/common/platform/platform.go
new file mode 100644
index 00000000..a35f0fc4
--- /dev/null
+++ b/common/platform/platform.go
@@ -0,0 +1,10 @@
+// Package platform provides platform specific functionalities.
+package platform
+
+type environment interface {
+	ExpandEnv(s string) string
+}
+
+func ExpandEnv(s string) string {
+	return environmentInstance.ExpandEnv(s)
+}
diff --git a/common/platform/windows.go b/common/platform/windows.go
new file mode 100644
index 00000000..4a6ae7b8
--- /dev/null
+++ b/common/platform/windows.go
@@ -0,0 +1,17 @@
+// +build windows
+
+package platform
+
+import (
+	"os"
+)
+
+type windowsEnvironment struct {
+}
+
+var environmentInstance = &windowsEnvironment{}
+
+func (e *windowsEnvironment) ExpandEnv(s string) string {
+	// TODO
+	return s
+}