mirror of
https://github.com/chromium/crashpad.git
synced 2024-12-31 01:43:03 +08:00
51b21d8874
This implements a non-stdio-based getline() equivalent. getline() is not in the Android NDK until API 21 (Android 5.0.0), while Chrome builds for 32-bit platforms with API 16 (Android 4.1.0). Although a getline() declaration could be provided in compat for use with older NDK headers, it’s desirable to move away from stdio entirely. The C++ DelimitedFileReader interface is also a bit more comfortable to use than getline(). A getdelim() equivalent is also provided, and is also used in the Linux/Android ProcessInfo implementation. Bug: crashpad:30 Test: crashpad_util_test FileLineReader.*:ProcessInfo.* Change-Id: Ic1664758a87cfe4953ab22bd3ae190761404b22c Reviewed-on: https://chromium-review.googlesource.com/455998 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Mark Mentovai <mark@chromium.org>
94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
|
||
//
|
||
// 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.
|
||
|
||
#ifndef CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
|
||
#define CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
|
||
|
||
#include <stdint.h>
|
||
|
||
#include <string>
|
||
|
||
#include "base/macros.h"
|
||
#include "util/file/file_reader.h"
|
||
|
||
namespace crashpad {
|
||
|
||
//! \brief Reads a file one field or line at a time.
|
||
//!
|
||
//! The file is interpreted as a series of fields separated by delimiter
|
||
//! characters. When the delimiter character is the newline character
|
||
//! (<code>'\\n'</code>), the file is interpreted as a series of lines.
|
||
//!
|
||
//! It is safe to mix GetDelim() and GetLine() calls, if appropriate for the
|
||
//! format being interpreted.
|
||
//!
|
||
//! This is a replacement for the standard library’s `getdelim()` and
|
||
//! `getline()` functions, adapted to work with FileReaderInterface objects
|
||
//! instead of `FILE*` streams.
|
||
class DelimitedFileReader {
|
||
public:
|
||
//! \brief The result of a GetDelim() or GetLine() call.
|
||
enum class Result {
|
||
//! \brief An error occurred, and a message was logged.
|
||
kError = -1,
|
||
|
||
//! \brief A field or line was read from the file.
|
||
kSuccess,
|
||
|
||
//! \brief The end of the file was encountered.
|
||
kEndOfFile,
|
||
};
|
||
|
||
explicit DelimitedFileReader(FileReaderInterface* file_reader);
|
||
~DelimitedFileReader();
|
||
|
||
//! \brief Reads a single field from the file.
|
||
//!
|
||
//! \param[in] delimiter The delimiter character that terminates the field.
|
||
//! It is safe to call this method multiple times while changing the value
|
||
//! of this parameter, if appropriate for the format being interpreted.
|
||
//! \param[out] field The field read from the file. This parameter will
|
||
//! include the field’s terminating delimiter character unless the field
|
||
//! was at the end of the file and was read without such a character.
|
||
//! This parameter will not be empty.
|
||
//!
|
||
//! \return a #Result value. \a field is only valid when Result::kSuccess is
|
||
//! returned.
|
||
Result GetDelim(char delimiter, std::string* field);
|
||
|
||
//! \brief Reads a single line from the file.
|
||
//!
|
||
//! \param[out] line The line read from the file. This parameter will include
|
||
//! the line terminating delimiter character unless the line was at the
|
||
//! end of the file and was read without such a character. This parameter
|
||
//! will not be empty.
|
||
//!
|
||
//! \return a #Result value. \a line is only valid when Result::kSuccess is
|
||
//! returned.
|
||
Result GetLine(std::string* line);
|
||
|
||
private:
|
||
char buf_[4096];
|
||
FileReaderInterface* file_reader_; // weak
|
||
uint16_t buf_pos_; // Index into buf_ of the start of the next field.
|
||
uint16_t buf_len_; // The size of buf_ that’s been filled.
|
||
bool eof_; // Caches the EOF signal when detected following a partial field.
|
||
|
||
DISALLOW_COPY_AND_ASSIGN(DelimitedFileReader);
|
||
};
|
||
|
||
} // namespace crashpad
|
||
|
||
#endif // CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
|