blob: 9114ae0be646f336e953fa5b08a8d16aaf8235dc [file] [log] [blame]
// Copyright 2021 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// GEN_BUILD:CONDITION(is_linux || is_mac)
#include "src/tint/utils/file/tmpfile.h"
#include <unistd.h>
#include <limits>
#include "src/tint/utils/ice/ice.h"
namespace tint {
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(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 tint