Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!sun-barr!decwrl!uunet!brunix!dkb
From: dkb@cs.brown.edu (Dilip Barman)
Newsgroups: comp.lang.lisp
Subject: Building a string, character-by-character (HELP!)
Message-ID: <51703@brunix.UUCP>
Date: 1 Oct 90 05:36:16 GMT
Sender: news@brunix.UUCP
Reply-To: dkb@cs.brown.edu (Dilip Barman)
Organization: Brown University Department of Computer Science
Lines: 14


I'm writing a lexical analyzer in Common LISP and am having problems
in dealing with characters.  I am using the read-char built-in 
function to read from a file stream in a "standard" way to ignore
white space and fold to upper case alphabetic characters.  However,
I find no way to deal with string concatenation - i.e., how do I 
keep tacking on filtered characters to a nascent output string?
The cons primitive will build a list structure and seems to be
irrelevant to what I'm trying to do.  Any suggestions????

Dilip Barman     dkb@cs.brown.edu
U.S. mail: Brown University                       Home: 40 Everett Avenue
           Dept. of Computer Science, Box 1910          Providence, RI 02906
           Providence, RI 02912 (401)863-7666           (401)521-9731