Newsgroups: comp.lang.c
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: LEX Question
Message-ID: <1989Feb23.164129.8672@utzoo.uucp>
Organization: U of Toronto Zoology
References: <32240@auc.UUCP> <9580001@hpcuhb.HP.COM> <1989Feb15.200741.15963@utzoo.uucp> <412@chem.ucsd.EDU>
Date: Thu, 23 Feb 89 16:41:29 GMT

In article <412@chem.ucsd.EDU> tps@chem.ucsd.edu (Tom Stockfisch) writes:
>>Be careful:  this is not a documented feature, at least not in all versions
>>of lex, and therefore should not be relied on too heavily in portable code.
>
>Have you run across a version of lex that does NOT have yyin/yyout?
>I've always thought changing yyin was much more portable than re-defining
>input().

Re-defining "input" is in the documentation as the way to alter input; any
version of lex that follows the manual (and hence deserves to be called
"lex") will permit it and have it work as documented.  "yyin" is not
documented at all -- it is an accident of the original implementation --
and hence may change without warning between versions.
-- 
The Earth is our mother;       |     Henry Spencer at U of Toronto Zoology
our nine months are up.        | uunet!attcan!utzoo!henry henry@zoo.toronto.edu