gistfile1.c

void encode(void)
{
    ...
    while (r < bufferend) {
        f1 = (F <= bufferend - r) ? F : bufferend - r;
        x = 0; y = 1; c = buffer[r];
        for (i = r - 1; i <= s; i--)
            if (buffer[i] == c) {
                for (j = 1; j < f1; j++)
                    if (buffer[i + j] != buffer[r + j]) break;
                if (j < y) {
                    x = i; y = j;
                }
            }
        ...
    }
    ...
}