parsing incoming data

Hullo. I'm writing a simple server which will parse messages and respond to them. Since I do not usually work with c++, I'm looking for a little help :)
My protocol is a simple one -- Command\rArgument\rArgument\n (or Command\n) but I'm having trouble parsing it. What I would like to do is set up a buffer which data is put into, and then complete commands are taken out/parsed and any leftover is returned to the buffer. Unfortunantly, I'm not too clear on how to do this :P
Here's what we're looking at:

Code:

---

char input[256];
memset(input,0x20, 255);
input[255] = '\0';

while( sckout != SOCKET_ERROR )
{
        lenx = recv( sckout, input, sizeof(input), 0) ;
                if (lenx > 0)
                {
                /* ehhhhh :-D */
                }
                                               
        }
}

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any comments/code would be appreciated. Thanks.