From owner-cvs-all  Tue Nov 14 20:56:54 2000
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To: "Daniel C. Sobral" <dcs@newsguy.com>
Cc: Garance A Drosehn <gad@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG,
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From: "Louis A. Mamakos" <louie@TransSys.COM>
Subject: Re: cvs commit: src/usr.sbin/lpr/lpd printjob.c 
References: <200011142132.NAA19274@freefall.freebsd.org> <3A11B20A.8AE1A5CA@newsguy.com> 
In-reply-to: Your message of "Wed, 15 Nov 2000 06:43:38 +0900."
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> Garance A Drosehn wrote:
> > 
> > gad         2000/11/14 13:32:52 PST
> > 
> >   Modified files:
> >     usr.sbin/lpr/lpd     printjob.c
> >   Log:
> >   Get rid of 'exit(-1)' calls.  Exit codes are limited to 8 bits under most
> >   Unixes, so -1 becomes 0xFF for 2's complement and 0xFE (?) for 1's
> >   complement.
> 
> That's true, but, afaik, C standard mandates 2's complement. Also, you
> forgot 0x01 for sign-bit. :-)

The sign bit is still 0x80 for an 8 bit signed integer.  Perhaps you're
thinking about the end-around-carry? 

Having actually used a C compiler on a 1's complement, 36-bit word addressable
CPU architecture, I don't think this is the case.. 

Anyway, my K&R is mostly silent on the issue of 1's complement CPU
architectures, referring to the ~ operater as the 1's complement unary
operator.  

louie







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