source: vendor/flex/2.5.33/doc/flex.info-6@ 3031

This is flex.info, produced by makeinfo version 4.5 from flex.texi.

INFO-DIR-SECTION Programming
START-INFO-DIR-ENTRY
* flex: (flex).      Fast lexical analyzer generator (lex replacement).
END-INFO-DIR-ENTRY


   The flex manual is placed under the same licensing conditions as the
rest of flex:

   Copyright (C) 1990, 1997 The Regents of the University of California.
All rights reserved.

   This code is derived from software contributed to Berkeley by Vern
Paxson.

   The United States Government has rights in this work pursuant to
contract no. DE-AC03-76SF00098 between the United States Department of
Energy and the University of California.

   Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

  1.  Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the
     distribution.
   Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.

   THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

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unnamed-faq-76
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     To: "Frescatore, David (CRD, TAD)" <[email protected]>
     Subject: Re: FLEX 2.5 & THE YEAR 2000
     In-reply-to: Your message of Wed, 03 Jun 1998 11:26:22 PDT.
     Date: Wed, 03 Jun 1998 10:22:26 PDT
     From: Vern Paxson <vern>
     
     > I am researching the Y2K problem with General Electric R&D
     > and need to know if there are any known issues concerning
     > the above mentioned software and Y2K regardless of version.
     
     There shouldn't be, all it ever does with the date is ask the system
     for it and then print it out.
     
                Vern


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unnamed-faq-77
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     To: "Hans Dermot Doran" <[email protected]>
     Subject: Re: flex problem
     In-reply-to: Your message of Wed, 15 Jul 1998 21:30:13 PDT.
     Date: Tue, 21 Jul 1998 14:23:34 PDT
     From: Vern Paxson <vern>
     
     > To overcome this, I gets() the stdin into a string and lex the string. The
     > string is lexed OK except that the end of string isn't lexed properly
     > (yy_scan_string()), that is the lexer dosn't recognise the end of string.
     
     Flex doesn't contain mechanisms for recognizing buffer endpoints.  But if
     you use fgets instead (which you should anyway, to protect against buffer
     overflows), then the final \n will be preserved in the string, and you can
     scan that in order to find the end of the string.
     
                Vern


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unnamed-faq-78
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     To: [email protected]
     Subject: Re: Flex++ 2.5.3 instance member vs. static member
     In-reply-to: Your message of Mon, 27 Jul 1998 02:10:04 PDT.
     Date: Tue, 28 Jul 1998 01:10:34 PDT
     From: Vern Paxson <vern>
     
     > %{
     > int mylineno = 0;
     > %}
     > ws      [ \t]+
     > alpha   [A-Za-z]
     > dig     [0-9]
     > %%
     >
     > Now you'd expect mylineno to be a member of each instance of class
     > yyFlexLexer, but is this the case?  A look at the lex.yy.cc file seems to
     > indicate otherwise; unless I am missing something the declaration of
     > mylineno seems to be outside any class scope.
     >
     > How will this work if I want to run a multi-threaded application with each
     > thread creating a FlexLexer instance?
     
     Derive your own subclass and make mylineno a member variable of it.
     
                Vern


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unnamed-faq-79
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     To: Adoram Rogel <[email protected]>
     Subject: Re: More than 32K states change hangs
     In-reply-to: Your message of Tue, 04 Aug 1998 16:55:39 PDT.
     Date: Tue, 04 Aug 1998 22:28:45 PDT
     From: Vern Paxson <vern>
     
     > Vern Paxson,
     >
     > I followed your advice, posted on Usenet bu you, and emailed to me
     > personally by you, on how to overcome the 32K states limit. I'm running
     > on Linux machines.
     > I took the full source of version 2.5.4 and did the following changes in
     > flexdef.h:
     > #define JAMSTATE -327660
     > #define MAXIMUM_MNS 319990