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Date:	Fri, 24 Dec 2004 20:18:03 -0500
From:	Joe Wright <joewwright AT comcast DOT net>
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: CTYPE stuff for Eli or DJ
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DJ Delorie wrote:
>>Even faulty, if '(int)(c)+1' is not in range do we risk segfault or 
>>other awful outcome? Kaz' demons come to mind.
> 
> 
> Most libc functions will segfault if you pass them faulty data.  It is
> up to the application to ensure robust usage of libc functions.
> 
> Frankly, I'd rather see your application segfault than silently do the
> wrong thing.  That will encourage you to fix it ;-)

No need for that, I think. Consider..

__dj_ctype_flags[(unsigned)(c) > 255 ? 0 : ((c)+1)]

..which will allow 'int is*(int c)' to take any int, including EOF 
and do the 'Wright' thing.

Note that casting as in 'isspace((unsigned char)c)' will keep you in 
the 0..256 array bounds but gives wrong answers, unless you think 
that -224 (0xffffff20) is a space.

Am I missing something?
Merry Christmas
-- 
Joe Wright                            mailto:joewwright AT comcast DOT net
"Everything should be made as simple as possible, but not simpler."
                     --- Albert Einstein ---

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