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From: rsalz@bbn.com (Richard Salz)
Newsgroups: comp.lang.c
Subject: Re: whats wrong with this lex grammer? (help)
Message-ID: <187@papaya.bbn.com>
Date: Tue, 22-Sep-87 10:15:22 EDT
Article-I.D.: papaya.187
Posted: Tue Sep 22 10:15:22 1987
Date-Received: Thu, 24-Sep-87 04:39:22 EDT
References: <443@aucs.UUCP>
Reply-To: rsalz@bbn.com (Rich Salz)
Distribution: na
Organization: BBN Laboratories, Cambridge MA
Lines: 37

In comp.lang.c (<443@aucs.UUCP>), 820785gm@aucs.UUCP (ANDREW MACLEOD) writes:
] how do I write a lex regexp that recognizes comments (* .... *) ?

You're probably better off doing what I did.  This is from "real-life"
code:

	/* State of our comment automata. */
	typedef enum {
	    S_STAR, S_NORMAL, S_END
	} STATE;

	"/*"	        {
			    /* Comment. */
			    register STATE	 S;

			    for (S = S_NORMAL; S != S_END; )
				switch (input()) {
				    case '\0':
					S = S_END;
					break;
				    case '*':
					S = S_STAR;
					break;
				    case '/':
					if (S == S_STAR) {
					    S = S_END;
					    break;
					}
					/* FALLTHROUGH */
				    default:
					S = S_NORMAL;
					break;
				}
			}

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