Article 56 of net.sources.bugs:
Path: mcdsun!noao!hao!nbires!seismo!rutgers!princeton!allegra!ulysses!mhuxt!ihnp4!houxm!hjuxa!catnip!ben
From: ben@catnip.UUCP
Newsgroups: net.sources.bugs
Subject: Fix to make Unix arc work on 16 bit machines
Message-ID: <438@catnip.UUCP>
Date: 25 Dec 86 06:15:15 GMT
Organization: The Broder Residence, Holmdel, NJ  07733
Lines: 27

There is a bug in the recently distributed Unix ARC that will cause
it to fail when extracting long files, in partcular, files whose
size cannot be expressed as a 16 bit quantity.

The problem is in the dos2long conversion in arcunix.c.

The offending code as it originally appears

#define dos2long(x) ((unsigned char)(x)[0] + ((unsigned char)(x)[1]<<8) + \
		((unsigned char)(x)[2]<<16) + \ ((unsigned char)(x)[3]<<24))


will shift (x)[2] and (x)[3] straight into the bit bucket.  I just casted
them to long to rectify the problem.

#define dos2long(x) ((unsigned char)(x)[0] + ((unsigned char)(x)[1]<<8) + \
		((long)(unsigned char)(x)[2]<<16) + \
                ((long)(unsigned char)(x)[3]<<24))

----
arc now appears to run fine under SCO Xenix.

-- 

Ben Broder
{ihnp4,decvax} !hjuxa!catnip!ben
{houxm,clyde}/