80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
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// Copyright 2019 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/base/internal/scoped_set_env.h"
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#include <cstdlib>
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#include "absl/base/internal/raw_logging.h"
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namespace absl {
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namespace base_internal {
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namespace {
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#ifdef _WIN32
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const int kMaxEnvVarValueSize = 1024;
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#endif
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void SetEnvVar(const char* name, const char* value) {
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#ifdef _WIN32
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SetEnvironmentVariable(name, value);
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#else
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if (value == nullptr) {
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::unsetenv(name);
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} else {
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::setenv(name, value, 1);
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}
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#endif
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}
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} // namespace
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ScopedSetEnv::ScopedSetEnv(const char* var_name, const char* new_value)
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: var_name_(var_name), was_unset_(false) {
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#ifdef _WIN32
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char buf[kMaxEnvVarValueSize];
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auto get_res = GetEnvironmentVariable(var_name_.c_str(), buf, sizeof(buf));
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ABSL_INTERNAL_CHECK(get_res < sizeof(buf), "value exceeds buffer size");
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if (get_res == 0) {
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was_unset_ = (GetLastError() == ERROR_ENVVAR_NOT_FOUND);
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} else {
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old_value_.assign(buf, get_res);
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}
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SetEnvironmentVariable(var_name_.c_str(), new_value);
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#else
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const char* val = ::getenv(var_name_.c_str());
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if (val == nullptr) {
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was_unset_ = true;
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} else {
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old_value_ = val;
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}
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#endif
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SetEnvVar(var_name_.c_str(), new_value);
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}
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ScopedSetEnv::~ScopedSetEnv() {
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SetEnvVar(var_name_.c_str(), was_unset_ ? nullptr : old_value_.c_str());
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}
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} // namespace base_internal
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} // namespace absl
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