[adb] Issue the "auth" emulator command before any other one

Emulator console now requires authentication; this means
'adb emu ...' commands silently fail because of it.
This CL adds an 'auth <token>' command to each user command,
making sure it won't be silently ignored.

(cherry-pick of a9e2b99a7fdd31bcd6d852c6db26fe592236a24f.)

Bug: https://code.google.com/p/android/issues/detail?id=211233
Change-Id: Id9ca4999fd2e6393cc88278eaf444243e13c0ec0
diff --git a/adb/adb_utils.cpp b/adb/adb_utils.cpp
index 5d4755f..31ec8af 100644
--- a/adb/adb_utils.cpp
+++ b/adb/adb_utils.cpp
@@ -35,6 +35,14 @@
 #include "adb_trace.h"
 #include "sysdeps.h"
 
+#ifdef _WIN32
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#  include "windows.h"
+#  include "shlobj.h"
+#endif
+
 ADB_MUTEX_DEFINE(basename_lock);
 ADB_MUTEX_DEFINE(dirname_lock);
 
@@ -254,3 +262,30 @@
 
     return true;
 }
+
+std::string adb_get_homedir_path(bool check_env_first) {
+#ifdef _WIN32
+    if (check_env_first) {
+        if (const char* const home = getenv("ANDROID_SDK_HOME")) {
+            return home;
+        }
+    }
+
+    WCHAR path[MAX_PATH];
+    const HRESULT hr = SHGetFolderPathW(NULL, CSIDL_PROFILE, NULL, 0, path);
+    if (FAILED(hr)) {
+        D("SHGetFolderPathW failed: %s", android::base::SystemErrorCodeToString(hr).c_str());
+        return {};
+    }
+    std::string home_str;
+    if (!android::base::WideToUTF8(path, &home_str)) {
+        return {};
+    }
+    return home_str;
+#else
+    if (const char* const home = getenv("HOME")) {
+        return home;
+    }
+    return {};
+#endif
+}