1. LICENSE

LTL2BA - Version 1.0 - October 2001
Written by Denis Oddoux, LIAFA, France
Copyright (c) 2001  Denis Oddoux

LTL2BA - Version 1.1 - August 2007
Modified by Paul Gastin, LSV, France
Copyright (c) 2007  Paul Gastin
Available at http://www.lsv.ens-cachan.fr/~gastin/ltl2ba

LTL2BA - Version 1.2 - May 2018
Modified by Paul Gastin, LSV, France
Copyright (c) 2018  Paul Gastin
Available at http://www.lsv.ens-cachan.fr/~gastin/ltl2ba

LTL2BA - Version 1.3 - June 2020
Modified by Paul Gastin, LSV, France
Copyright (c) 2018  Paul Gastin
Available at http://www.lsv.ens-cachan.fr/~gastin/ltl2ba

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version. GNU GPL is included in this
distribution, in a file called 'LICENSE'

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

The LTL2BA software was written by Denis Oddoux and modified by Paul
Gastin.  It is based on the translation algorithm presented at CAV '01:
	P.Gastin and D.Oddoux
	"Fast LTL to B�chi Automata Translation"
	in 13th International Conference on Computer Aided Verification, CAV 2001,
	G. Berry, H. Comon, A. Finkel (Eds.)
	Paris, France, July 18-22, 2001,
	Proceedings - LNCS 2102, pp. 53-65

Send bug-reports and/or questions to Paul Gastin
http://www.lsv.ens-cachan.fr/~gastin

Part of the code included is issued from the SPIN software Version 3.4.1
The SPIN software is written by Gerard J. Holzmann, originally as part
of ``Design and Validation of Protocols,'' ISBN 0-13-539925-4,
1991, Prentice Hall, Englewood Cliffs, NJ, 07632
Here are the files that contain some code from Spin v3.4.1 :

	cache.c  (originally tl_cache.c)
	lex.c    (           tl_lex.c  )
	ltl2ba.h (           tl.h      )
	main.c   (           tl_main.c )
	mem.c.   (           tl_mem.c  )
	parse.c  (           tl_parse.c)
	rewrt.c  (           tl_rewrt.c)
	trans.c	 (           tl_trans.c)

2. COMPILING

open the archive :
> tar -xzf ltl2ba-1.3.tar.gz
> cd ltl2ba-1.3

compile the program
> make

3. EXECUTING

run the program
> ./ltl2ba -f 'formula'

The formula is an LTL formula, and may contain propositional symbols,
boolean operators, temporal operators, and parentheses.
The syntax used is the one used in the 'Spin' model-checker

Propositonal Symbols:
        true, false
        any lowercase string

Boolean operators:
        !   (negation)
        ->  (implication)
        <-> (equivalence)
        &&  (and)
        ||  (or)

Temporal operators:
        []  (always)
        <>  (eventually)
        U   (until)
        V   (release)
        X   (next)

Use spaces between any symbols.

The result is a never claim in Promela that can be given to the
Spin model checker to verify properties on a system.

run the command
> ./ltl2ba
to see the possible options for executing the program

4. CHANGES IN VERSION 1.1

- fixing a bug in the way sets were used for strongly connected components. Thanks to Joachim Klein (klein@tcs.inf.tu-dresden.de) who found the bug and proposed a patch to fix it.
- fixing a bug in the simplification with strongly connected components for the generalized B�chi automaton.
- improving the simplification with strongly connected components for the generalized B�chi automaton.
- using getrusage to compute running times for the statistics
- some other minor updates.

5. CHANGES IN VERSION 1.3

Thanks to Jerry James for the patches addressing the following issues
- compatibility with gcc 10 (link-time failure for identically named
variables in different files)
- Remove unused function and variable declarations
- Make (f)printf format declarations match the types of the corresponding expressions
- Remove the second argument to Fatal(), fatal() and non_fatal(), since it is always NULL
- Make main() return something (since it is supposed to return int)