filereader.cpp

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/* -*- c++ -*- ---------------------------------------------------------------
   Copyright (C) 2005, SWECO, All Rights Reserved.

   Implementation of FileReader class

   Author: Zsolt Molnar ([e-mail])
   ---------------------------------------------------------------------------*/

#include <unistd.h>
#include <iostream>
#include "FileReader.hh"

namespace { 
	const char rcs_id[] = "$Id$"; 
}


size_t FileReader::_bufLen = FR_DEF_BUFLEN;


FileReader::FileReader(const string& aFileName)
	: _file(aFileName.c_str()),
	  _fileName(aFileName)
{
	// EMPTY
}


FileReader::~FileReader()
{
	close();
}


string FileReader::nextLine()
{
	if (!_file) {
		return "";
	}

	string line;
	char buf[_bufLen];

	do {
		int i = 0;
		while (i < _bufLen - 1) {
			char c = _file.get();
			if (c == '\n' || _file.eof()) {
				break;
			}
			buf[i] = c;
			++i;
		}
		buf[i] = '\0';
		line += buf;
	} while (!_file.eof() && strlen(buf) == _bufLen - 1);

	return line;
}


bool FileReader::isEnd()
{
	return !_file || _file.eof();
}


void FileReader::close()
{
	_file.close();
}


void FileReader::remove()
{
	close();
	unlink(_fileName.c_str());
}


#ifdef __TEST__
#include <assert.h>

bool FileReader::test()
{
	const char* fname = "/tmp/freader_test";
	ofstream test(fname);
	string line1 = "";
	string line2 = "asdas";
	string line3 = "sdjklofhsdkl fdsoklfj osad";
	test << line1 << endl << line2 << endl << line3;
	_bufLen = 10;
	test.close();

	FileReader freader(fname);
	// Cannot be at the end...
	assert(!freader.isEnd());
	// Read the first line
	string rline = freader.nextLine();
	assert(!freader.isEnd());
	assert(rline == line1);
	// read the next line
	rline = freader.nextLine();
	assert(!freader.isEnd());
	assert(rline == line2);
	// read the next line
	rline = freader.nextLine();
	assert(freader.isEnd());
	assert(rline == line3);
	// read teh next line while no more liness...
	rline = freader.nextLine();
	assert(freader.isEnd());
	assert(rline.empty());
	// remove the file
	freader.remove();
	ifstream testFile(fname);
	// it must not be there
	assert(!testFile);
	
	unlink(fname);
	cout << "FileReader test passed" << endl;
	return true;
}
#endif // #ifdef __TEST__