Approaching an Alcoholic

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I know that I could probably just google it up and get similar information, but I want to hear different perspectives in the same thread. There's a level of quality I appreciate here too.

My friend is an alcoholic. I don't know when it started exactly. We've known each other for 3-4 years, and we met through our party lifestyle. But back then drinking was more of a weekend thing, or when there was a great clubnight to go to. Now it's every night for him.

When we chat he tells me what he's been up to, and every story includes how much he drank that night. It's always, "I went to ____ bar and drank ____ [which is always enough to knock me out]." Repeat times 7 for every night of the week, though sometimes he drinks at a house instead of a bar. It's starting to be sad, because he doesn't seem to have any close friends anymore, just clubbers he drinks his pints with. He still does fine at work (he seems to get a raises or promoted 2-3 times a year), but he's been "joking" about drinking at work lately too. So while he's functional, I worry about his health and long term ability to maintain this lifestyle.

How can I approach him about it? Are his constant mentions of how much he drinks a veiled cry for help? Can and should I do anything? Do you have any other advice that I should have asked for but didn't?

Thanks.