From:	vance AT deneb DOT com (Stephen Vance)
Subject:	Re: some unusual errors
22 Sep 1998 05:57:46 -0700 :
Message-ID:	<360669BE.A06C57B2.cygnus.gnu-win32@deneb.com>
References:	<199809182005 DOT QAA03634 AT venus DOT solidum DOT com>
Mime-Version:	1.0
To:	Michael Richardson <mcr AT solidum DOT com>
Cc:	gnu-win32 AT cygnus DOT com

Michael Richardson wrote:

> I get a lot of warnings like this:
>
> strtod.c:1239: warning: subscript has type `char'
>
>   This line of code is actually:
>
>         for(s = s00; isspace(*s); s++)
>
>   which confuses me. What, if not "char" should isspace() take???

The reason isspace() and friends are defined this way is that special characters like EOF are not always represented by "char".  The standard
leaves the choice of "signed char" or "unsigned char" as the default "char" as implementation defined.  EOF is usually -1.  If you want 8-bit
chars, -1 maps to an already defined char in either representation, but as an int it is distinct.

--
Stephen Vance                           |  http://www.deneb.com
Deneb Robotics, Inc.                    |  mailto:vance AT deneb DOT com
5500 New King Street                    |  Phone: (248) 267-9696
Troy, MI 48098-2615                     |  Fax:   (248) 267-8585

What is done well is done quickly enough. -Augustus Caesar



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