Prove uniform convergence of Fourier Series of $2\pi$ periodic function

Question

I am working on the following exercise:

Let $f: \mathbb{R} \rightarrow \mathbb{R}$ be a $2\pi$ periodic function that is almost everywhere differentiable. (The derivative is a regulated function.) Show that the Fourier series of $f$ converges uniformly on $\mathbb{R}$.

I do not know how I could prove this as the conditions on $f$ are really weak. Could you help me?