Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsd!orion.cf.uci.edu!uci-ics!paris.ics.uci.edu
From: nagel@paris.ics.uci.edu (Mark Nagel)
Newsgroups: comp.lang.c
Subject: Re: LEX Question
Message-ID: <8180@paris.ics.uci.edu>
Date: 24 Feb 89 18:26:14 GMT
References: <32240@auc.UUCP> <9580001@hpcuhb.HP.COM> <1989Feb15.200741.15963@utzoo.uucp> <412@chem.ucsd.EDU> <1989Feb23.164129.8672@utzoo.uucp> <416@chem.ucsd.EDU>
Sender: news@paris.ics.uci.edu
Reply-To: nagel@paris.ics.uci.edu (Mark Nagel)
Organization: University of California, Irvine - Dept of ICS
Lines: 18
In-reply-to: tps@chem.ucsd.edu (Tom Stockfisch)

In article <416@chem.ucsd.EDU>, tps@chem (Tom Stockfisch) writes:
|
|I must be missing something.  Looking at lex.yy.c on my machine shows that
|input() is defined as
|
|# define input() (((yytchar=yysptr>yysbuf?U(*--yysptr):getc(yyin))==10? \
|	(yylineno++,yytchar):yytchar)==EOF?0:yytchar)
|
|so if I re-#define input(), don't I have to use yytchar,yysptr, and yysbuf?
|I would assume one of these would be more likely to change than yyin.

If you redefine input() in lex, you'd most likely redefine it in such
a way that you'd manage the input entirely yourself.  So you would have
no need for lex's internal input management.

Mark Nagel @ UC Irvine, Dept of Info and Comp Sci
ARPA: nagel@ics.uci.edu              | Charisma doesn't have jelly in the
UUCP: {sdcsvax,ucbvax}!ucivax!nagel  | middle. -- Jim Ignatowski