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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.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
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#define CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
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#include <stdint.h>
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#include <string>
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#include "base/macros.h"
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#include "util/file/file_reader.h"
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namespace crashpad {
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//! \brief Reads a file one field or line at a time.
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//!
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//! The file is interpreted as a series of fields separated by delimiter
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//! characters. When the delimiter character is the newline character
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//! (<code>'\\n'</code>), the file is interpreted as a series of lines.
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//!
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//! It is safe to mix GetDelim() and GetLine() calls, if appropriate for the
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//! format being interpreted.
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//!
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//! This is a replacement for the standard library’s `getdelim()` and
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//! `getline()` functions, adapted to work with FileReaderInterface objects
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//! instead of `FILE*` streams.
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class DelimitedFileReader {
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public:
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//! \brief The result of a GetDelim() or GetLine() call.
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enum class Result {
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//! \brief An error occurred, and a message was logged.
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kError = -1,
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//! \brief A field or line was read from the file.
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kSuccess,
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//! \brief The end of the file was encountered.
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kEndOfFile,
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};
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explicit DelimitedFileReader(FileReaderInterface* file_reader);
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~DelimitedFileReader();
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//! \brief Reads a single field from the file.
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//!
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//! \param[in] delimiter The delimiter character that terminates the field.
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//! It is safe to call this method multiple times while changing the value
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//! of this parameter, if appropriate for the format being interpreted.
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//! \param[out] field The field read from the file. This parameter will
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//! include the field’s terminating delimiter character unless the field
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//! was at the end of the file and was read without such a character.
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//! This parameter will not be empty.
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//!
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//! \return a #Result value. \a field is only valid when Result::kSuccess is
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//! returned.
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Result GetDelim(char delimiter, std::string* field);
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//! \brief Reads a single line from the file.
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//!
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//! \param[out] line The line read from the file. This parameter will include
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//! the line terminating delimiter character unless the line was at the
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//! end of the file and was read without such a character. This parameter
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//! will not be empty.
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//!
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//! \return a #Result value. \a line is only valid when Result::kSuccess is
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//! returned.
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Result GetLine(std::string* line);
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private:
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char buf_[4096];
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FileReaderInterface* file_reader_; // weak
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uint16_t buf_pos_; // Index into buf_ of the start of the next field.
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uint16_t buf_len_; // The size of buf_ that’s been filled.
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bool eof_; // Caches the EOF signal when detected following a partial field.
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DISALLOW_COPY_AND_ASSIGN(DelimitedFileReader);
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
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