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From: cogen@XN.LL.MIT.EDU (David Cogen)
Newsgroups: comp.lang.lisp
Subject: Re: Symbolics Common Lisp
Message-ID: <699@xn.LL.MIT.EDU>
Date: Fri, 11-Sep-87 11:29:04 EDT
Article-I.D.: xn.699
Posted: Fri Sep 11 11:29:04 1987
Date-Received: Sat, 12-Sep-87 17:21:09 EDT
References: <10224@duke.cs.duke.edu>
Organization: MIT Lincoln Laboratory, Lexington, MA
Lines: 17
In-reply-to: rfs@duke.cs.duke.edu's message of 11 Sep 87 14:53:06 GMT

Posting-Front-End: GNU Emacs 18.46.1 of Fri Jun 12 1987 on xn (berkeley-unix)


In article <10224@duke.cs.duke.edu> rfs@duke.cs.duke.edu (Robert F. Smith) writes:
   I am working in common lisp on a symbolics lisp machine.  I need to be able
   to distinguish between upper and lower case letters entered from the
   keyboard.  It seems that the lisp machine treats characters from the
   keyboard differently than characters stored in files (where case tests do
   work).  Is there some trick, or some flag to set, that will allow me to test
   the case distinction?

You should have no problem (I just verified it.) First, how are you reading the
characters from the keyboard? The correct way is READ-CHAR; it will return a
character object. (Do not use READ; this will read a single-character symbol,
which generally gets converted to upper case.) When you have the characters,
test using CHAR=, which respects case distinctions, or CHAR-EQUAL, which ignores
them. As far as differences between keyboard input and file input, I have never
noticed this. Could you elaborate?

(david () cogen)