Article View: net.lang.c
Article #9755Re: Signed char - What Foolishness Is This!
From: Joseph S. D. Yao
Date: Fri, 07 Nov 1986 06:35
Date: Fri, 07 Nov 1986 06:35
18 lines
1510 bytes
1510 bytes
In article <228@apple.UUCP> mikes@apple.UUCP (Mike Shannon) writes:
>In <8719@duke.duke.UUCP> jwg@duke.UUCP (Jeffrey William Gillette) writes:
>>MSC 4.0 defaults 'char' to 'signed char'. ...
>> This works great when c = 65 ('A'), but when c = 154
>>('U'umlaut) the macro produces the following: ( (_ctype+1)[-102] & UPPER )
>> ....
The standard (K&R, and now X3J11) has always held that 'char' is
signed or unsigned, depending on the machine. For good, usable,
portable code I've tended to do arithmetic ops (such as indexing
an array) in shorts or ints, masking input chars. This is also
great for testing EOF ... Also, the ctype macros should NOT be
used with any char > 0177, simply because many or most current
implementations only use a buffer that large.
--
Joe Yao hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}
jsdy@hadron.COM (not yet domainised)
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!seismo!sundc!netxcom!hadron!jsdy From: jsdy@hadron.UUCP (Joseph S. D. Yao) Newsgroups: net.lang.c,net.micro.pc Subject: Re: Signed char - What Foolishness Is This! Message-ID: <606@hadron.UUCP> Date: Fri, 7-Nov-86 01:35:33 EST Article-I.D.: hadron.606 Posted: Fri Nov 7 01:35:33 1986 Date-Received: Sat, 8-Nov-86 07:02:17 EST References: <8719@duke.duke.UUCP> <228@apple.UUCP> Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao) Organization: Hadron, Inc., Fairfax, VA Lines: 18 Summary: Suggestions for portable usage.