blob: d75764d8669b565f96ae24aacfb81482805138f6 [file] [log] [blame]
// Copyright 2021 The Tint 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 "src/utils/io/tmpfile.h"
#include <unistd.h>
#include <limits>
#include "src/debug.h"
namespace tint {
namespace utils {
namespace {
std::string TmpFilePath(std::string ext) {
char const* dir = getenv("TMPDIR");
if (dir == nullptr) {
dir = "/tmp";
}
// mkstemps requires an `int` for the file extension name but STL represents
// size_t. Pre-C++20 there the behavior for unsigned-to-signed conversion
// (when the source value exceeds the representable range) is implementation
// defined. While such a large file extension is unlikely in practice, we
// enforce this here at runtime.
TINT_ASSERT(Utils, ext.length() <=
static_cast<size_t>(std::numeric_limits<int>::max()));
std::string name = std::string(dir) + "/tint_XXXXXX" + ext;
int file = mkstemps(&name[0], static_cast<int>(ext.length()));
if (file != -1) {
close(file);
return name;
}
return "";
}
} // namespace
TmpFile::TmpFile(std::string extension)
: path_(TmpFilePath(std::move(extension))) {}
TmpFile::~TmpFile() {
if (!path_.empty()) {
remove(path_.c_str());
}
}
bool TmpFile::Append(const void* data, size_t size) const {
if (auto* file = fopen(path_.c_str(), "ab")) {
fwrite(data, size, 1, file);
fclose(file);
return true;
}
return false;
}
} // namespace utils
} // namespace tint