Path: utzoo!utgpu!watserv1!watmath!att!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!wuarchive!uunet!munnari.oz.au!metro!cluster!necisa!boyd
From: boyd@necisa.ho.necisa.oz (Boyd Roberts)
Newsgroups: comp.lang.c
Subject: Re: Trouble with curses
Message-ID: <1903@necisa.ho.necisa.oz>
Date: 29 Oct 90 23:13:38 GMT
References: <173826@<1990Oct27> <20900012@inmet>
Organization: NEC Information Systems Australia Pty. Ltd.
Lines: 23

In article <20900012@inmet> draper@inmet.inmet.com writes:
>
>Hi, this is Connie. I'm accessing this net with a friends account. 
>I have a question about the curses package. Heres the skeletal code:
>
> [deleted]
>
>  switch(tolower(getch())) {
>

What's the bet that tolower() is a macro?  And is coded to evaluate its
argument _twice_?  That way you get two calls to getch() instead of one.

Eg:

    #define tolower(c)	(chartab[(c)] & C_UPPER ? (c) - 'A' + 'a' : (c))

You've got to watch those macros when their arguments have side affects.


Boyd Roberts			boyd@necisa.ho.necisa.oz.au

``When the going gets wierd, the weird turn pro...''