mirror of
https://github.com/klzgrad/naiveproxy.git
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134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/environment.h"
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#include <array>
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#include <string_view>
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#include "base/memory/ptr_util.h"
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#include "base/strings/string_util.h"
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#include "base/strings/utf_string_conversions.h"
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#include "build/build_config.h"
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#if BUILDFLAG(IS_WIN)
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#include <windows.h>
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#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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#include <stdlib.h>
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#endif
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namespace base {
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namespace {
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class EnvironmentImpl : public Environment {
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public:
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bool GetVar(std::string_view variable_name, std::string* result) override {
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if (GetVarImpl(variable_name, result)) {
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return true;
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}
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// Some commonly used variable names are uppercase while others
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// are lowercase, which is inconsistent. Let's try to be helpful
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// and look for a variable name with the reverse case.
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// I.e. HTTP_PROXY may be http_proxy for some users/systems.
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char first_char = variable_name[0];
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std::string alternate_case_var;
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if (IsAsciiLower(first_char)) {
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alternate_case_var = ToUpperASCII(variable_name);
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} else if (IsAsciiUpper(first_char)) {
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alternate_case_var = ToLowerASCII(variable_name);
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} else {
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return false;
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}
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return GetVarImpl(alternate_case_var, result);
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}
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bool SetVar(std::string_view variable_name,
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const std::string& new_value) override {
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return SetVarImpl(variable_name, new_value);
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}
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bool UnSetVar(std::string_view variable_name) override {
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return UnSetVarImpl(variable_name);
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}
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private:
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bool GetVarImpl(std::string_view variable_name, std::string* result) {
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#if BUILDFLAG(IS_WIN)
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std::wstring wide_name = UTF8ToWide(variable_name);
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if (!result) {
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return ::GetEnvironmentVariable(wide_name.c_str(), nullptr, 0) != 0;
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}
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// Documented to be the maximum environment variable size.
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std::array<wchar_t, 32767> value;
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DWORD value_length =
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::GetEnvironmentVariable(wide_name.c_str(), value.data(), value.size());
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if (value_length == 0) {
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return false;
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}
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CHECK_LE(value_length, value.size() - 1)
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<< "value should fit in the buffer (including the null terminator)";
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WideToUTF8(value.data(), value_length, result);
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return true;
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#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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const char* env_value = getenv(std::string(variable_name).c_str());
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if (!env_value) {
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return false;
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}
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// Note that the variable may be defined but empty.
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if (result) {
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*result = env_value;
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}
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return true;
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#endif
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}
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bool SetVarImpl(std::string_view variable_name,
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const std::string& new_value) {
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#if BUILDFLAG(IS_WIN)
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// On success, a nonzero value is returned.
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return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(),
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UTF8ToWide(new_value).c_str());
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#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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// On success, zero is returned.
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return !setenv(variable_name.data(), new_value.c_str(), 1);
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#endif
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}
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bool UnSetVarImpl(std::string_view variable_name) {
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#if BUILDFLAG(IS_WIN)
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// On success, a nonzero value is returned.
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return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), nullptr);
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#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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// On success, zero is returned.
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return !unsetenv(variable_name.data());
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#endif
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}
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};
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} // namespace
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namespace env_vars {
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#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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// On Posix systems, this variable contains the location of the user's home
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// directory. (e.g, /home/username/).
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const char kHome[] = "HOME";
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#endif
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} // namespace env_vars
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Environment::~Environment() = default;
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// static
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std::unique_ptr<Environment> Environment::Create() {
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return std::make_unique<EnvironmentImpl>();
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}
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bool Environment::HasVar(std::string_view variable_name) {
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return GetVar(variable_name, nullptr);
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}
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} // namespace base
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