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// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "common/SystemUtils.h"
#include "common/Assert.h"
#include "common/Log.h"
#if defined(DAWN_PLATFORM_WINDOWS)
# include <Windows.h>
# include <vector>
#elif defined(DAWN_PLATFORM_LINUX)
# include <limits.h>
# include <unistd.h>
# include <cstdlib>
#elif defined(DAWN_PLATFORM_MACOS) || defined(DAWN_PLATFORM_IOS)
# include <mach-o/dyld.h>
# include <vector>
#endif
#include <array>
#if defined(DAWN_PLATFORM_WINDOWS)
const char* GetPathSeparator() {
return "\\";
}
std::pair<std::string, bool> GetEnvironmentVar(const char* variableName) {
// First pass a size of 0 to get the size of variable value.
DWORD sizeWithNullTerminator = GetEnvironmentVariableA(variableName, nullptr, 0);
if (sizeWithNullTerminator == 0) {
DWORD err = GetLastError();
if (err != ERROR_ENVVAR_NOT_FOUND) {
dawn::WarningLog() << "GetEnvironmentVariableA failed with code " << err;
}
return std::make_pair(std::string(), false);
}
// Then get variable value with its actual size.
std::vector<char> buffer(sizeWithNullTerminator);
DWORD sizeStored =
GetEnvironmentVariableA(variableName, buffer.data(), static_cast<DWORD>(buffer.size()));
if (sizeStored + 1 != sizeWithNullTerminator) {
DWORD err = GetLastError();
if (err) {
dawn::WarningLog() << "GetEnvironmentVariableA failed with code " << err;
}
return std::make_pair(std::string(), false);
}
return std::make_pair(std::string(buffer.data(), sizeStored), true);
}
bool SetEnvironmentVar(const char* variableName, const char* value) {
return SetEnvironmentVariableA(variableName, value) == TRUE;
}
#elif defined(DAWN_PLATFORM_POSIX)
const char* GetPathSeparator() {
return "/";
}
std::pair<std::string, bool> GetEnvironmentVar(const char* variableName) {
char* value = getenv(variableName);
return value == nullptr ? std::make_pair(std::string(), false)
: std::make_pair(std::string(value), true);
}
bool SetEnvironmentVar(const char* variableName, const char* value) {
if (value == nullptr) {
return unsetenv(variableName) == 0;
}
return setenv(variableName, value, 1) == 0;
}
#else
# error "Implement Get/SetEnvironmentVar for your platform."
#endif
#if defined(DAWN_PLATFORM_WINDOWS)
std::string GetExecutablePath() {
std::array<char, MAX_PATH> executableFileBuf;
DWORD executablePathLen = GetModuleFileNameA(nullptr, executableFileBuf.data(),
static_cast<DWORD>(executableFileBuf.size()));
return executablePathLen > 0 ? std::string(executableFileBuf.data()) : "";
}
#elif defined(DAWN_PLATFORM_LINUX)
std::string GetExecutablePath() {
std::array<char, PATH_MAX> path;
ssize_t result = readlink("/proc/self/exe", path.data(), PATH_MAX - 1);
if (result < 0 || static_cast<size_t>(result) >= PATH_MAX - 1) {
return "";
}
path[result] = '\0';
return path.data();
}
#elif defined(DAWN_PLATFORM_MACOS) || defined(DAWN_PLATFORM_IOS)
std::string GetExecutablePath() {
uint32_t size = 0;
_NSGetExecutablePath(nullptr, &size);
std::vector<char> buffer(size + 1);
if (_NSGetExecutablePath(buffer.data(), &size) != 0) {
return "";
}
buffer[size] = '\0';
return buffer.data();
}
#elif defined(DAWN_PLATFORM_FUCHSIA)
std::string GetExecutablePath() {
// TODO: Implement on Fuchsia
return "";
}
#elif defined(DAWN_PLATFORM_EMSCRIPTEN)
std::string GetExecutablePath() {
UNREACHABLE();
return "";
}
#else
# error "Implement GetExecutablePath for your platform."
#endif
std::string GetExecutableDirectory() {
std::string exePath = GetExecutablePath();
size_t lastPathSepLoc = exePath.find_last_of(GetPathSeparator());
return lastPathSepLoc != std::string::npos ? exePath.substr(0, lastPathSepLoc + 1) : "";
}
// ScopedEnvironmentVar
ScopedEnvironmentVar::ScopedEnvironmentVar(const char* variableName, const char* value)
: mName(variableName),
mOriginalValue(GetEnvironmentVar(variableName)),
mIsSet(SetEnvironmentVar(variableName, value)) {
}
ScopedEnvironmentVar::~ScopedEnvironmentVar() {
if (mIsSet) {
bool success = SetEnvironmentVar(
mName.c_str(), mOriginalValue.second ? mOriginalValue.first.c_str() : nullptr);
// If we set the environment variable in the constructor, we should never fail restoring it.
ASSERT(success);
}
}
bool ScopedEnvironmentVar::Set(const char* variableName, const char* value) {
ASSERT(!mIsSet);
mName = variableName;
mOriginalValue = GetEnvironmentVar(variableName);
mIsSet = SetEnvironmentVar(variableName, value);
return mIsSet;
}