adb: win32: make adb_getenv() case-insensitive

adb_getenv() should be case-insensitive just like the real getenv() on
Windows.

Added a unittest for adb_getenv(). In the process, made adb_test link
with -municode so that the environment block is Unicode.

Move wmain() from main.cpp to sysdeps_win32.cpp so that adb_test could
also use it.

Because wmain() moved, it wasn't as easy to do the runtime check to
verify that -municode was used, so do that check in _ensure_env_setup()
since adb_getenv() is called early in adb anyway.

Added a utility ToLower() which is good enough for env vars whose keys
are probably always ASCII to begin with.

Change-Id: I082f7fdee9dfe2c7f76b878528d2f7863df6d8d1
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/adb/sysdeps_win32_test.cpp b/adb/sysdeps_win32_test.cpp
new file mode 100755
index 0000000000..cc3ac5c166
--- /dev/null
+++ b/adb/sysdeps_win32_test.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include "sysdeps.h"
+
+TEST(sysdeps_win32, adb_getenv) {
+    // Insert all test env vars before first call to adb_getenv() which will
+    // read the env var block only once.
+    ASSERT_EQ(0, _putenv("SYSDEPS_WIN32_TEST_UPPERCASE=1"));
+    ASSERT_EQ(0, _putenv("sysdeps_win32_test_lowercase=2"));
+    ASSERT_EQ(0, _putenv("Sysdeps_Win32_Test_MixedCase=3"));
+
+    // UTF-16 value
+    ASSERT_EQ(0, _wputenv(L"SYSDEPS_WIN32_TEST_UNICODE=\u00a1\u0048\u006f\u006c"
+                          L"\u0061\u0021\u03b1\u03b2\u03b3\u0061\u006d\u0062"
+                          L"\u0075\u006c\u014d\u043f\u0440\u0438\u0432\u0435"
+                          L"\u0442"));
+
+    // Search for non-existant env vars.
+    EXPECT_STREQ(nullptr, adb_getenv("SYSDEPS_WIN32_TEST_NONEXISTANT"));
+
+    // Search for existing env vars.
+
+    // There is no test for an env var with a value of a zero-length string
+    // because _putenv() does not support inserting such an env var.
+
+    // Search for env var that is uppercase.
+    EXPECT_STREQ("1", adb_getenv("SYSDEPS_WIN32_TEST_UPPERCASE"));
+    EXPECT_STREQ("1", adb_getenv("sysdeps_win32_test_uppercase"));
+    EXPECT_STREQ("1", adb_getenv("Sysdeps_Win32_Test_Uppercase"));
+
+    // Search for env var that is lowercase.
+    EXPECT_STREQ("2", adb_getenv("SYSDEPS_WIN32_TEST_LOWERCASE"));
+    EXPECT_STREQ("2", adb_getenv("sysdeps_win32_test_lowercase"));
+    EXPECT_STREQ("2", adb_getenv("Sysdeps_Win32_Test_Lowercase"));
+
+    // Search for env var that is mixed-case.
+    EXPECT_STREQ("3", adb_getenv("SYSDEPS_WIN32_TEST_MIXEDCASE"));
+    EXPECT_STREQ("3", adb_getenv("sysdeps_win32_test_mixedcase"));
+    EXPECT_STREQ("3", adb_getenv("Sysdeps_Win32_Test_MixedCase"));
+
+    // Check that UTF-16 was converted to UTF-8.
+    EXPECT_STREQ("\xc2\xa1\x48\x6f\x6c\x61\x21\xce\xb1\xce\xb2\xce\xb3\x61\x6d"
+                 "\x62\x75\x6c\xc5\x8d\xd0\xbf\xd1\x80\xd0\xb8\xd0\xb2\xd0\xb5"
+                 "\xd1\x82",
+                 adb_getenv("SYSDEPS_WIN32_TEST_UNICODE"));
+
+    // Check an env var that should always be set.
+    const char* path_val = adb_getenv("PATH");
+    EXPECT_NE(nullptr, path_val);
+    if (path_val != nullptr) {
+        EXPECT_GT(strlen(path_val), 0);
+    }
+}