Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!wuarchive!emory!rsiatl!kd4nc!n4hgf!wht
From: wht@n4hgf.Mt-Park.GA.US (Warren Tucker)
Newsgroups: comp.lang.c
Subject: Re: Why is tolower behave different???
Message-ID: <174@n4hgf.Mt-Park.GA.US>
Date: 23 Jul 90 20:29:38 GMT
References: <2841@elrond.CalComp.COM> <1863@tkou02.enet.dec.com> <1990Jul23.040004.12292@laguna.ccsf.caltech.edu>
Reply-To: wht@n4hgf.UUCP (Warren Tucker)
Distribution: na
Organization: Amateur Radio Station N4HGF
Lines: 16

>>>Finally, it dawned on me that the function call tolower was to blame.
>>>On the VAX, the call did nothing if the char was already lowercase, while
>>>the Sun converted it anyway.

System 5-derived tolower() absolutely coverts, while BSD 
does the equivalent
   if isupper(ch) convert

ANSI aside, I'll always code
   if(isupper(ch))
		ch = tolower(ch);
to be safe.
 
----------------------------------------------------------------------
Warren Tucker, TuckerWare   emory!n4hgf!wht or wht@n4hgf.Mt-Park.GA.US
"It was electrons that brought down the Berlin Wall." -- Timothy Leary