63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
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/*
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* Copyright (C) 2015 The Android Open Source Project
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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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*/
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// Copied from system/extras/memory_replay/LineBuffer.cpp
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// TODO(ccross): find a way to share between libmemunreachable and memory_replay?
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "LineBuffer.h"
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LineBuffer::LineBuffer(int fd, char* buffer, size_t buffer_len) : fd_(fd), buffer_(buffer), buffer_len_(buffer_len) {
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}
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bool LineBuffer::GetLine(char** line, size_t* line_len) {
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while (true) {
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if (bytes_ > 0) {
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char* newline = reinterpret_cast<char*>(memchr(buffer_ + start_, '\n', bytes_));
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if (newline != nullptr) {
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*newline = '\0';
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*line = buffer_ + start_;
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start_ = newline - buffer_ + 1;
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bytes_ -= newline - *line + 1;
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*line_len = newline - *line;
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return true;
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}
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}
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if (start_ > 0) {
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// Didn't find anything, copy the current to the front of the buffer.
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memmove(buffer_, buffer_ + start_, bytes_);
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start_ = 0;
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}
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ssize_t bytes = TEMP_FAILURE_RETRY(read(fd_, buffer_ + bytes_, buffer_len_ - bytes_ - 1));
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if (bytes <= 0) {
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if (bytes_ > 0) {
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// The read data might not contain a nul terminator, so add one.
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buffer_[bytes_] = '\0';
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*line = buffer_ + start_;
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*line_len = bytes_;
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bytes_ = 0;
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start_ = 0;
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return true;
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}
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return false;
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}
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bytes_ += bytes;
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}
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}
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