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// Copyright 2025 Huawei Cloud Computing Technology Co., Ltd.
//
// 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/buildtool/file_system/atomic.hpp"
#ifdef __unix__
#include <unistd.h>
#else
#error "Non-unix is not supported yet"
#endif
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "fmt/core.h"
auto FileSystemAtomic::WriteFile(std::string const& filename,
std::string const& content) noexcept -> bool {
// As there is no high-level replacement of mkstemp(3), we fall back to
// using the libc functions.
auto filename_tmp_template = fmt::format("{}.XXXXXX", filename);
char* filename_tmp = strdup(filename_tmp_template.c_str());
if (filename_tmp == nullptr) {
return false;
}
auto fd = mkstemp(filename_tmp);
if (fd == -1) {
free(filename_tmp); // NOLINT
return false;
}
size_t to_write = content.length();
const char* buf = content.c_str();
while (to_write > 0) {
auto written = write(fd, buf, to_write);
if (written < 0) {
(void)close(fd);
free(filename_tmp); // NOLINT
return false;
}
to_write -= static_cast<size_t>(written);
buf = &buf[written]; // NOLINT
}
if (close(fd) != 0) {
free(filename_tmp); // NOLINT
return false;
}
if (rename(filename_tmp, filename.c_str()) != 0) {
free(filename_tmp); // NOLINT
return false;
}
free(filename_tmp); // NOLINT
return true;
}
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