88a152ae74
-- 5dc8d7504b7c11710b19365a6582c288c8992366 by Derek Mauro <dmauro@google.com>: Fix constexpr Span::last under MSVC and add Span constexpr tests. PiperOrigin-RevId: 237515952 -- 5ea8c146e653bbc49ff7e698699478242df7de35 by Derek Mauro <dmauro@google.com>: Implement Span::first and Span::last from C++20. https://github.com/abseil/abseil-cpp/pull/274 PiperOrigin-RevId: 237494399 -- 08db3417f1d8fe4556255d57a2f0df51b09bdd9a by Derek Mauro <dmauro@google.com>: HTTPS in more URLs. PiperOrigin-RevId: 237486823 -- 83ec63a7f8e47b62af619546f9f7b3bf72e74e86 by Derek Mauro <dmauro@google.com>: Changed HTTP URLs to HTTPS where possible. https://github.com/abseil/abseil-cpp/pull/270 PiperOrigin-RevId: 237445310 -- 220bf279c14cb31efa239500d1a70e0ac0c32e3c by Abseil Team <absl-team@google.com>: Support parsing decltype(nullptr) as a type. PiperOrigin-RevId: 237336739 -- ced234bbe78f5d495c3f6f6a9c2e0a95f7c080a5 by Gennadiy Rozental <rogeeff@google.com>: Introduce internal interface for setting environment variable value in scope PiperOrigin-RevId: 237275806 -- 1f1acb4e294af24d9f7598e85163d5e1d9958ae9 by Samuel Benzaquen <sbenza@google.com>: Avoid using aliases in the SFINAE expressions to make it more compatible with MSVC. Turn on the tests in MSVC. PiperOrigin-RevId: 237261456 -- 06cf7de6250a0572ef90fa1176f742ca0451ce71 by Derek Mauro <dmauro@google.com>: Fix unused variable warning. PiperOrigin-RevId: 237108006 GitOrigin-RevId: 5dc8d7504b7c11710b19365a6582c288c8992366 Change-Id: Ife5182c80942945c4e8700844c8febb482d6ad82
79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
// 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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