Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpda!hpcuhb!najmi
From: najmi@hpcuhb.HP.COM (Farrukh Najmi)
Newsgroups: comp.lang.c
Subject: Re: LEX Question
Message-ID: <9580001@hpcuhb.HP.COM>
Date: 13 Feb 89 22:55:48 GMT
References: <32240@auc.UUCP>
Organization: Hewlett Packard, Cupertino
Lines: 16

Its not clear to me what it is you are trying to do.
Lex produces a function in lex.yy.c called yylex().
This function as a default reads from standard input.

However one can make it read from a file (using file pointer)
by declaring the file pointer variable and then assigning
it to yyin. The yyin assignment must be before after the %%
and before any regular definitions.

%{
extern FILE *input_fileptr;
%}
%%
    yyin = input_fileptr;

/* regular definitions go here. */