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Path: utzoo!watmath!clyde!burl!ulysses!harpo!decvax!mcvax!enea!kim
From: kim@enea.UUCP
Newsgroups: net.unix-wizards
Subject: Re: lex(1) bug -- lex users BEWARE! - (nf)
Message-ID: <223@enea.UUCP>
Date: Mon, 7-May-84 04:00:17 EST
Article-I.D.: enea.223
Posted: Mon May  7 04:00:17 1984
Date-Received: Fri, 27-Apr-84 06:05:57 EST
Sender: notes@enea.UUCP
Organization: ENEA DATA, Sweden
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#R:burl:-43600:enea:600001:000:583
enea!kim    Apr 24 11:03:00 1984

Yes, I was hit by this bug a year ago.
Looking at the output from lex (the version supplied with 4.1bsd)
reveals that the size of 'yytext' and some related areas
are only 200 chars!

Since lex does not check for overflow, the simplest fix is
to increase the buffer size by redefining the symbol YYLMAX.

After discovering the bug, I routinely include the following two lines:

# undef YYLMAX
# define YYLMAX 10000

at the start of each lex program, and then I will get a 'bus error'
only when trying to match an abnormally long string by mistake.

			Kim Walden
			...mcvax!enea!kim