Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!uakari.primate.wisc.edu!larry!jwp
From: jwp@larry.sal.wisc.edu (Jeffrey W Percival)
Newsgroups: comp.unix.wizards
Subject: Yacc/Lex: multiple uses in the same program?
Keywords: yacc lex yyparse yylex local/global variables
Message-ID: <727@larry.sal.wisc.edu>
Date: 16 Sep 89 20:36:29 GMT
Organization: Space Astronomy Lab, Madison WI
Lines: 22

I am using Yacc and Lex to parse a special purpose "language", and am
in a bind.  I wrote a yacc file with my grammar, and a lex program for
finding tokens.  So far, so good.

Now, in one of my subroutines I need to pick apart a string, entirely
unrelated to the parsing that's going on.  The string has a format
consisting of a name followed by an optional offset.  The offset can be
of the form number/H for hex, number/O for octal, etc.

So I think to myself, a fledgling yacc/lex user, I can specify this as
a "mini" language, and use lex and yacc to pick it apart.  I supplied
my own input() and unput() to feed yylex from my own private string
storage.  I even remembered to put a "static" in front of the yyparse()
and yylex() definitions in my "mini" parser file, to avoid conflicts
with the "main" parser.

But when I link my main program, I run into trouble with ld(1) finding
multiple definitions of many lex variables.

How can I do what I want?
-- 
Jeff Percival (jwp@larry.sal.wisc.edu)