LineReader.h

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#ifndef LINEREADER_H_
#define LINEREADER_H_

#include <iostream>

class LineReader
{
public:

    LineReader( int fd, size_t bufferSize = 1024, bool debug = false )
        : fd_( fd ),
          bufferSize_( bufferSize ),
          bufferRead_( 0 ),
          debug_( debug )
    {
        buffer_ = new char[bufferSize_];
    }

    ~LineReader()
    {
        delete[] buffer_;
    }

    //           output buffer is large enough to continue waiting for the line. Call again later.
    int readLine( char* buf, size_t bufSize ) ;

protected:
    int fd_;

private:
    // disallow copy constructor
    LineReader( const LineReader& old );

    char* buffer_;
    size_t bufferSize_;
    size_t bufferRead_;    // number of bytes read but not yet processed
    bool debug_;

    void adjustBuffer( size_t bufSize );
    int fillInBuffer();
    void updateBuffer( size_t processed );
    int nbRead( char* buffer, size_t bufferLength );

};

#endif /*LINEREADER_H_*/