Read Last Line in Text File Without Reading Rest of File?

I wish to read the last line of a .csv file without having to read the entire file (they're quite long). The only way I could think to do it is like this:

Code:

---

int main(int argc, char *argv[])
{
        ifstream fin("test.csv");
        streamoff offset = -2;
        char ch;

        do
        {
                --offset;
                fin.seekg(offset, ios_base::end);
                fin.read(&ch, 1);
        } while (ch != '\n');

        char szLastLine[128];
        fin.getline(szLastLine, 128);
        fin.close();

        cout << szLastLine << endl;

        return 0;
}

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That seems to work fine but I have read that you're not supposed to use seekg with text files so I don't know if this code is good or not.

Is this code okay and if not is there a better solution?

Thanks for any help you can offer.