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https://github.com/ClickHouse/ClickHouse.git
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167 lines
2.7 KiB
C++
167 lines
2.7 KiB
C++
//
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// FileStream_POSIX.cpp
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//
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// Library: Foundation
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// Package: Streams
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// Module: FileStream
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//
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// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#include "Poco/FileStream.h"
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#include "Poco/File.h"
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#include "Poco/Exception.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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namespace Poco {
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FileStreamBuf::FileStreamBuf():
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BufferedBidirectionalStreamBuf(BUFFER_SIZE, std::ios::in | std::ios::out),
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_fd(-1),
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_pos(0)
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{
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}
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FileStreamBuf::~FileStreamBuf()
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{
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close();
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}
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void FileStreamBuf::open(const std::string& path, std::ios::openmode mode)
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{
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poco_assert (_fd == -1);
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_pos = 0;
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_path = path;
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setMode(mode);
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resetBuffers();
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int flags(0);
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if (mode & std::ios::trunc)
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flags |= O_TRUNC;
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if (mode & std::ios::app)
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flags |= O_APPEND;
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if (mode & std::ios::out)
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flags |= O_CREAT;
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if ((mode & std::ios::in) && (mode & std::ios::out))
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flags |= O_RDWR;
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else if (mode & std::ios::in)
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flags |= O_RDONLY;
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else
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flags |= O_WRONLY;
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_fd = ::open(path.c_str(), flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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if (_fd == -1)
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File::handleLastError(_path);
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if ((mode & std::ios::app) || (mode & std::ios::ate))
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seekoff(0, std::ios::end, mode);
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}
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int FileStreamBuf::readFromDevice(char* buffer, std::streamsize length)
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{
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if (_fd == -1) return -1;
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if (getMode() & std::ios::out)
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sync();
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int n = read(_fd, buffer, length);
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if (n == -1)
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File::handleLastError(_path);
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_pos += n;
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return n;
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}
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int FileStreamBuf::writeToDevice(const char* buffer, std::streamsize length)
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{
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if (_fd == -1) return -1;
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int n = write(_fd, buffer, length);
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if (n == -1)
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File::handleLastError(_path);
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_pos += n;
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return n;
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}
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bool FileStreamBuf::close()
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{
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bool success = true;
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if (_fd != -1)
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{
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try
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{
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sync();
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}
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catch (...)
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{
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success = false;
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}
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::close(_fd);
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_fd = -1;
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}
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return success;
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}
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std::streampos FileStreamBuf::seekoff(std::streamoff off, std::ios::seekdir dir, std::ios::openmode mode)
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{
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if (_fd == -1 || !(getMode() & mode))
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return -1;
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if (getMode() & std::ios::out)
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sync();
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std::streamoff adj;
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if (mode & std::ios::in)
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adj = static_cast<std::streamoff>(egptr() - gptr());
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else
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adj = 0;
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resetBuffers();
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int whence = SEEK_SET;
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if (dir == std::ios::cur)
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{
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whence = SEEK_CUR;
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off -= adj;
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}
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else if (dir == std::ios::end)
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{
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whence = SEEK_END;
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}
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_pos = lseek(_fd, off, whence);
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return _pos;
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}
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std::streampos FileStreamBuf::seekpos(std::streampos pos, std::ios::openmode mode)
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{
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if (_fd == -1 || !(getMode() & mode))
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return -1;
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if (getMode() & std::ios::out)
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sync();
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resetBuffers();
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_pos = lseek(_fd, pos, SEEK_SET);
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return _pos;
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}
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} // namespace Poco
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