Repo created

TMessagesProj/jni/voip/webrtc/base/environment.cc

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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/environment.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
+#include <stdlib.h>
+#endif
+
+namespace base {
+
+namespace {
+
+class EnvironmentImpl : public Environment {
+ public:
+  bool GetVar(StringPiece variable_name, std::string* result) override {
+    if (GetVarImpl(variable_name, result))
+      return true;
+
+    // Some commonly used variable names are uppercase while others
+    // are lowercase, which is inconsistent. Let's try to be helpful
+    // and look for a variable name with the reverse case.
+    // I.e. HTTP_PROXY may be http_proxy for some users/systems.
+    char first_char = variable_name[0];
+    std::string alternate_case_var;
+    if (IsAsciiLower(first_char))
+      alternate_case_var = ToUpperASCII(variable_name);
+    else if (IsAsciiUpper(first_char))
+      alternate_case_var = ToLowerASCII(variable_name);
+    else
+      return false;
+    return GetVarImpl(alternate_case_var, result);
+  }
+
+  bool SetVar(StringPiece variable_name,
+              const std::string& new_value) override {
+    return SetVarImpl(variable_name, new_value);
+  }
+
+  bool UnSetVar(StringPiece variable_name) override {
+    return UnSetVarImpl(variable_name);
+  }
+
+ private:
+  bool GetVarImpl(StringPiece variable_name, std::string* result) {
+#if defined(OS_WIN)
+    DWORD value_length =
+        ::GetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), nullptr, 0);
+    if (value_length == 0)
+      return false;
+    if (result) {
+      std::unique_ptr<wchar_t[]> value(new wchar_t[value_length]);
+      ::GetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), value.get(),
+                               value_length);
+      *result = WideToUTF8(value.get());
+    }
+    return true;
+#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
+    const char* env_value = getenv(variable_name.data());
+    if (!env_value)
+      return false;
+    // Note that the variable may be defined but empty.
+    if (result)
+      *result = env_value;
+    return true;
+#endif
+  }
+
+  bool SetVarImpl(StringPiece variable_name, const std::string& new_value) {
+#if defined(OS_WIN)
+    // On success, a nonzero value is returned.
+    return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(),
+                                    UTF8ToWide(new_value).c_str());
+#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
+    // On success, zero is returned.
+    return !setenv(variable_name.data(), new_value.c_str(), 1);
+#endif
+  }
+
+  bool UnSetVarImpl(StringPiece variable_name) {
+#if defined(OS_WIN)
+    // On success, a nonzero value is returned.
+    return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), nullptr);
+#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
+    // On success, zero is returned.
+    return !unsetenv(variable_name.data());
+#endif
+  }
+};
+
+}  // namespace
+
+namespace env_vars {
+
+#if defined(OS_POSIX) || defined(OS_FUCHSIA)
+// On Posix systems, this variable contains the location of the user's home
+// directory. (e.g, /home/username/).
+const char kHome[] = "HOME";
+#endif
+
+}  // namespace env_vars
+
+Environment::~Environment() = default;
+
+// static
+std::unique_ptr<Environment> Environment::Create() {
+  return std::make_unique<EnvironmentImpl>();
+}
+
+bool Environment::HasVar(StringPiece variable_name) {
+  return GetVar(variable_name, nullptr);
+}
+
+}  // namespace base