Date: Mon, 16 Oct 1995 09:13:04 -0400 From: Thomas David Rivers <ponds!rivers@dg-rtp.dg.com> To: ache@astral.msk.su, x.org!kaleb@dg-rtp.dg.com Cc: hackers@freefall.FreeBSD.org Subject: Re: A couple problems in FreeBSD 2.1.0-950922-SNAP Message-ID: <199510161313.JAA02822@lakes>
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>
> Historycally ctype(>127) returns 0 in many systems that I see,
>
Well, being intimately involved with 'C' compilers and libraries
on the mainframe (where EBCDIC, not ASCII rules the day) - I can
tell you this is a problem... since the valid EBCDIC characters
are negative if you have signed chars! Many valid EBCDIC characters
have the high-bit set, making them much larger than 127. [I don't
know how many customers pass negative values to ctype..] Fortunately,
on those machines, 'char' is unsigned, but people still make mistakes
with "portable" code.
Also, we see a lot of people doing things like:
if(ch < 127) {
printf("%c\n", ch);
}
which doesn't work too well on an EBCDIC box.
- Just to jump in from the other side of the world -
- Dave Rivers -
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