128 lines
3.5 KiB
C++
128 lines
3.5 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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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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#if defined(OS_POSIX)
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#include <stdlib.h>
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#elif defined(OS_WIN)
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#include <windows.h>
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#endif
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#include "base/strings/string_util.h"
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#if defined(OS_WIN)
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#include "base/memory/scoped_ptr.h"
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#include "base/strings/utf_string_conversions.h"
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#endif
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namespace {
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class EnvironmentImpl : public base::Environment {
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public:
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virtual bool GetVar(const char* variable_name,
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std::string* result) OVERRIDE {
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if (GetVarImpl(variable_name, result))
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return true;
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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 (first_char >= 'a' && first_char <= 'z')
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alternate_case_var = StringToUpperASCII(std::string(variable_name));
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else if (first_char >= 'A' && first_char <= 'Z')
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alternate_case_var = StringToLowerASCII(std::string(variable_name));
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else
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return false;
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return GetVarImpl(alternate_case_var.c_str(), result);
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}
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virtual bool SetVar(const char* 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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virtual bool UnSetVar(const char* 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(const char* variable_name, std::string* result) {
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#if defined(OS_POSIX)
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const char* env_value = getenv(variable_name);
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if (!env_value)
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return false;
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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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return true;
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#elif defined(OS_WIN)
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DWORD value_length = ::GetEnvironmentVariable(
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UTF8ToWide(variable_name).c_str(), NULL, 0);
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if (value_length == 0)
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return false;
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if (result) {
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scoped_ptr<wchar_t[]> value(new wchar_t[value_length]);
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::GetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), value.get(),
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value_length);
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*result = WideToUTF8(value.get());
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}
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return true;
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#else
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#error need to port
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#endif
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}
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bool SetVarImpl(const char* variable_name, const std::string& new_value) {
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#if defined(OS_POSIX)
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// On success, zero is returned.
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return !setenv(variable_name, new_value.c_str(), 1);
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#elif defined(OS_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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#endif
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}
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bool UnSetVarImpl(const char* variable_name) {
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#if defined(OS_POSIX)
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// On success, zero is returned.
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return !unsetenv(variable_name);
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#elif defined(OS_WIN)
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// On success, a nonzero value is returned.
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return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), NULL);
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#endif
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}
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};
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} // namespace
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namespace base {
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namespace env_vars {
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#if defined(OS_POSIX)
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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() {}
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// static
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Environment* Environment::Create() {
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return new EnvironmentImpl();
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}
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bool Environment::HasVar(const char* variable_name) {
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return GetVar(variable_name, NULL);
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}
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} // namespace base
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