Put everything back.

ctrtool/deps/libtoolchain/src/os/Environment.cpp

@@ -0,0 +1,40 @@
+#include <tc/os/Environment.h>
+#include <tc/string.h>
+
+bool tc::os::getEnvVar(const std::string& name, std::string& value)
+{
+	bool did_find_variable = false;
+#ifdef _WIN32
+	// convert utf-8 to utf-16 for wide char functions
+	std::u16string utf16_name;
+	tc::string::TranscodeUtil::UTF8ToUTF16(name, utf16_name);
+
+	// get size of environment variable
+	size_t required_size = 0;
+	_wgetenv_s(&required_size, nullptr, 0, (wchar_t*)utf16_name.c_str());
+
+	// set output if variable was found
+	if (required_size != 0)
+	{
+		// get environment variable
+		std::shared_ptr<wchar_t> utf16_value(new wchar_t[required_size]);
+		_wgetenv_s(&required_size, utf16_value.get(), required_size, (wchar_t*)utf16_name.c_str());
+
+		// transcode back to utf-8
+		tc::string::TranscodeUtil::UTF16ToUTF8((char16_t*)utf16_value.get(), value);
+
+		did_find_variable = true;
+	}
+#else
+	// get ptr to env variable
+	char* env_ptr = getenv(name.c_str());
+
+	// set output if variable was found
+	if (env_ptr != nullptr)
+	{
+		value = std::string(env_ptr);
+		did_find_variable = true;
+	}
+#endif
+	return did_find_variable;
+}