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From: gld@cunixd.cc.columbia.edu (Gary L Dare)
Newsgroups: comp.unix.questions,comp.misc
Subject: File I/O with lex/yacc
Summary: getting around stdin/stdout in lex ... but not by hand!
Keywords: lex, yacc, file i/o
Message-ID: <1990Aug29.172830.14348@cunixf.cc.columbia.edu>
Date: 29 Aug 90 17:28:30 GMT
References: <2320@cirrusl.UUCP> <1990Aug29.122152.1600@virtech.uucp>
Sender: news@cunixf.cc.columbia.edu (The Daily News)
Reply-To: gld@cunixd.cc.columbia.edu (Gary L Dare)
Organization: The Ghostbusters Institute at Columbia University
Lines: 21


Is there any way to get around the use of standard input/output in a
lex file???  The C file generated by lex (from the lexical analyzer
spec you feed in) has the following line hard-coded:

	FILE *yyin = {stdin}, *yyout = {stdout};

however, there doesn't seem to be a way to sneak in a redefinition of
yyin or yyout as a pointer to a file (a single, in-line statement)
except by hand, 'cos a switch{} is generated in C from the lexical
analysis rules.

Is there any way to force a single, inline statement into the C
file generated by lex, other than by hand?

gld
--
~~~~~~~~~~~~~~~~~~~~~~~~ Je me souviens ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Gary L. Dare				No golf courses on
> gld@cunixD.cc.columbia.EDU		Mohawk Indian
> gld@cunixc.BITNET			burial grounds! (Oka, Quebec)