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16b900b63e
We currently use a mix of C standard includes (e.g. limits.h) and their C++ variants (e.g. climits). This migrates to a consistent style for all cases where the C++ variants are acceptable, but leaves the C equivalents in place where they are required, such as in the embedder API and other headers that may be used from C.
80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "files.h"
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#include <fcntl.h>
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#include <cstdint>
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#include "inlines.h"
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#include "logging.h"
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namespace dart_utils {
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namespace {
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bool ReadFileDescriptor(int fd, std::string* result) {
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DEBUG_CHECK(result, LOG_TAG, "");
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result->clear();
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if (fd < 0) {
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return false;
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}
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constexpr size_t kBufferSize = 1 << 16;
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size_t offset = 0;
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ssize_t bytes_read = 0;
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do {
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offset += bytes_read;
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result->resize(offset + kBufferSize);
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bytes_read = read(fd, &(*result)[offset], kBufferSize);
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} while (bytes_read > 0);
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if (bytes_read < 0) {
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result->clear();
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return false;
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}
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result->resize(offset + bytes_read);
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return true;
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}
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bool WriteFileDescriptor(int fd, const char* data, ssize_t size) {
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ssize_t total = 0;
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for (ssize_t partial = 0; total < size; total += partial) {
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partial = write(fd, data + total, size - total);
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if (partial < 0)
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return false;
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}
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return true;
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}
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} // namespace
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bool ReadFileToString(const std::string& path, std::string* result) {
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return ReadFileToStringAt(AT_FDCWD, path, result);
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}
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bool ReadFileToStringAt(int dirfd,
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const std::string& path,
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std::string* result) {
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int fd = openat(dirfd, path.c_str(), O_RDONLY);
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bool status = ReadFileDescriptor(fd, result);
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close(fd);
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return status;
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}
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bool WriteFile(const std::string& path, const char* data, ssize_t size) {
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int fd = openat(AT_FDCWD, path.c_str(), O_CREAT | O_TRUNC | O_WRONLY, 0666);
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if (fd < 0) {
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return false;
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}
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bool status = WriteFileDescriptor(fd, data, size);
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close(fd);
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return status;
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}
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} // namespace dart_utils
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