1 files changed, 53 insertions, 0 deletions
diff --git a/src/jaegertracing/opentelemetry-cpp/sdk/include/opentelemetry/sdk/common/env_variables.h b/src/jaegertracing/opentelemetry-cpp/sdk/include/opentelemetry/sdk/common/env_variables.h
new file mode 100644
index 000000000..be955ee86
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/sdk/include/opentelemetry/sdk/common/env_variables.h
@@ -0,0 +1,53 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <string>
+#include "opentelemetry/version.h"
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace sdk
+{
+namespace common
+{
+
+#if defined(_MSC_VER)
+inline int setenv(const char *name, const char *value, int)
+{
+  return _putenv_s(name, value);
+}
+
+inline int unsetenv(const char *name)
+{
+  return setenv(name, "", 1);
+}
+#endif
+
+// Returns the env variable set.
+inline const std::string GetEnvironmentVariable(const char *env_var_name)
+{
+#if !defined(NO_GETENV)
+  const char *endpoint_from_env = nullptr;
+#  if defined(_MSC_VER)
+  // avoid calling std::getenv which is deprecated in MSVC.
+  size_t required_size = 0;
+  getenv_s(&required_size, nullptr, 0, env_var_name);
+  std::unique_ptr<char> endpoint_buffer;
+  if (required_size > 0)
+  {
+    endpoint_buffer = std::unique_ptr<char>{new char[required_size]};
+    getenv_s(&required_size, endpoint_buffer.get(), required_size, env_var_name);
+    endpoint_from_env = endpoint_buffer.get();
+  }
+#  else
+  endpoint_from_env = std::getenv(env_var_name);
+#  endif  // defined(_MSC_VER)
+  return endpoint_from_env == nullptr ? std::string{} : std::string{endpoint_from_env};
+#else
+  return std::string{};
+#endif  // !defined(NO_GETENV)
+}
+}  // namespace common
+}  // namespace sdk
+OPENTELEMETRY_END_NAMESPACE