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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"
#if defined(OS_POSIX)
#include <stdlib.h>
#elif defined(OS_WIN)
#include <windows.h>
#endif
#include "base/strings/string_util.h"
#if defined(OS_WIN)
#include "base/memory/scoped_ptr.h"
#include "base/strings/utf_string_conversions.h"
#endif
namespace {
class EnvironmentImpl : public base::Environment {
public:
virtual bool GetVar(const char* 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 (first_char >= 'a' && first_char <= 'z')
alternate_case_var = StringToUpperASCII(std::string(variable_name));
else if (first_char >= 'A' && first_char <= 'Z')
alternate_case_var = StringToLowerASCII(std::string(variable_name));
else
return false;
return GetVarImpl(alternate_case_var.c_str(), result);
}
virtual bool SetVar(const char* variable_name,
const std::string& new_value) OVERRIDE {
return SetVarImpl(variable_name, new_value);
}
virtual bool UnSetVar(const char* variable_name) OVERRIDE {
return UnSetVarImpl(variable_name);
}
private:
bool GetVarImpl(const char* variable_name, std::string* result) {
#if defined(OS_POSIX)
const char* env_value = getenv(variable_name);
if (!env_value)
return false;
// Note that the variable may be defined but empty.
if (result)
*result = env_value;
return true;
#elif defined(OS_WIN)
DWORD value_length = ::GetEnvironmentVariable(
UTF8ToWide(variable_name).c_str(), NULL, 0);
if (value_length == 0)
return false;
if (result) {
scoped_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;
#else
#error need to port
#endif
}
bool SetVarImpl(const char* variable_name, const std::string& new_value) {
#if defined(OS_POSIX)
// On success, zero is returned.
return !setenv(variable_name, new_value.c_str(), 1);
#elif defined(OS_WIN)
// On success, a nonzero value is returned.
return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(),
UTF8ToWide(new_value).c_str());
#endif
}
bool UnSetVarImpl(const char* variable_name) {
#if defined(OS_POSIX)
// On success, zero is returned.
return !unsetenv(variable_name);
#elif defined(OS_WIN)
// On success, a nonzero value is returned.
return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), NULL);
#endif
}
};
} // namespace
namespace base {
namespace env_vars {
#if defined(OS_POSIX)
// 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() {}
// static
Environment* Environment::Create() {
return new EnvironmentImpl();
}
bool Environment::HasVar(const char* variable_name) {
return GetVar(variable_name, NULL);
}
} // namespace base
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