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Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!houxm!houxz!vax135!cornell!uw-beaver!tektronix!orca!andrew
From: andrew@orca.UUCP (Andrew Klossner)
Newsgroups: net.unix-wizards
Subject: Re: HELP needed from an experience lex-er
Message-ID: <930@orca.UUCP>
Date: Mon, 9-Jul-84 03:00:33 EDT
Article-I.D.: orca.930
Posted: Mon Jul  9 03:00:33 1984
Date-Received: Tue, 10-Jul-84 07:17:29 EDT
References: <238@cubsvax.UUCP>
Organization: Tektronix, Wilsonville OR
Lines: 27

[]

	"I hacked up lex.yy.c by changing the definitions of "input()"
	and "output(c)", as well as the function definiton of yylex(),
	so that yylex now has the form yylex(string), where string gets
	copied into extern char *instr.  Output is placed in extern
	char *outstr, which is returned.  The net effect is that
	yylex() can now be called as a subroutine from another
	function, and returns outstr to that function.  Fine and dandy.

	"This works wonderfully on the first call...  but on subsequent
	calls the input string never gets parsed;  the right part of
	yylook() is never entered.  Apparently, something is done to
	lex.yy.c's external variables during parsing, and something
	needs to be re-initialized before the second call will work
	properly.  If you know what it is, please let me know!"

You must execute the statement "NLSTATE;" upon each entry to yylex.
Put the following immediately in front of your first pattern, after the
first "%%":

%{
	NLSTATE;
%}

  -- Andrew Klossner   (decvax!tektronix!orca!andrew)      [UUCP]
                       (orca!andrew.tektronix@rand-relay)  [ARPA]